With Means To Reciprocate Saw Patents (Class 30/392)
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Publication number: 20130174428Abstract: A reciprocating power tool that includes a drive system having a first driven gear that includes a spindle counterbalance weight and a second driven gear that includes a spindle counterbalance weight. The first driven gear and the second driven gear rotate in opposite directions about an axis of rotation in response to rotation of a driving gear by a motor. The power tool further includes a spindle having a longitudinal axis and a first end that is configured to support a tool element. The spindle is coupled to one of the first driven gear and the second driven gear by a scotch yoke mechanism to reciprocate the spindle with respect to a housing of the power tool along the longitudinal axis of the spindle in response to operation of the motor.Type: ApplicationFiled: February 28, 2013Publication date: July 11, 2013Applicant: MILWAUKEE ELECTRIC TOOL CORPORATIONInventor: MILWAUKEE ELECTRIC TOOL CORPORATION
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Publication number: 20130133210Abstract: A power tool includes a motor housing having a motor configured to rotate an output shaft about a drive axis and a gear housing defining a gear compartment. A pinion gear is supported by the gear housing that is coupled to the output shaft for rotation about the drive axis. A bevel gear is supported by the gear housing for rotation about a bevel axis perpendicular to the drive axis, the bevel gear being meshingly engaged with the pinion gear. A crank pin extends from the bevel gear at a position offset from the bevel axis. An articulating housing is pivotably supported by the gear housing for pivotal movement about the bevel axis. A plunger member is supported by the articulating housing for reciprocating movement along a reciprocating axis. The plunger member includes a yoke end portion coupled to the crank pin. The reciprocating axis and the drive axis reside in the same plane throughout pivotal movement of the articulating housing with respect to the gear housing.Type: ApplicationFiled: November 30, 2011Publication date: May 30, 2013Applicants: ROBERT BOSCH GMBH, ROBERT BOSCH TOOL CORPORATIONInventors: J. Alan Weir, Dan Williams, Ron Llanes, Steve Oshgan, Peter Wierzchon
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Patent number: 8438741Abstract: A power tool including a sliding member slidably received in the power tool and a pair of lock plates, each of the pair of lock plates including an opening, and the lock plates being configured such that the sliding member slides within the opening. First ends of each of the lock plates are pivotably attached to a support at a first side of the sliding member, and second ends of each of the lock plates being biased toward one another at an opposite side of the sliding member. A first contact portion of the lock plate contacts a first surface of the sliding member at the first side of the sliding member, and a second contact portion of the lock plate contacts a second surface of the sliding member at the opposite side of the sliding member, wherein the sliding member is secured with respect to the support.Type: GrantFiled: August 5, 2011Date of Patent: May 14, 2013Assignee: Black & Decker, Inc.Inventors: Brent A. Kuehne, Mark D. Miller, John S. Vantran
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Patent number: 8407902Abstract: A reciprocating power tool that includes a drive system having a first driven gear that includes a spindle counterbalance weight and a second driven gear that includes a spindle counterbalance weight. The first driven gear and the second driven gear rotate in opposite directions about an axis of rotation in response to rotation of a driving gear by a motor. The power tool further includes a spindle having a longitudinal axis and a first end that is configured to support a tool element. The spindle is coupled to one of the first driven gear and the second driven gear by a scotch yoke mechanism to reciprocate the spindle with respect to a housing of the power tool along the longitudinal axis of the spindle in response to operation of the motor.Type: GrantFiled: March 10, 2010Date of Patent: April 2, 2013Assignee: Milwaukee Electric Tool CorporationInventors: Michael Naughton, Kurt Limberg, John S. Scott
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Patent number: 8393625Abstract: Several preferred embodiments are disclosed for a tool-less blade clamping apparatus for a reciprocating tool of the type which has a reciprocating plunger which has a tool attachment receiving slot for receiving a tool attachment of the type that has a shank portion. The clamping apparatus has an unclamped position and a clamped position. In the unclamped position, a tool attachment can be easily inserted and when it is in its clamped position, the tool attachment is securely retained. The preferred embodiments have at least one spring biasing the apparatus toward the clamped position, a releasable retaining mechanism for holding the apparatus in its unclamped position after being placed in that position. When the blade shank portion is inserted into the slot a predetermined distance, the shoulders of the shank portion release the retaining mechanism to move it to its clamped position.Type: GrantFiled: December 7, 2010Date of Patent: March 12, 2013Assignee: Robert Bosch GmbHInventors: Marc Vincent Marini, Vance E. Roe, Matthew Carr, Gary Sinclair, Gavin Wright
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Publication number: 20130047448Abstract: A power saw includes an electric motor, an impact assembly, and a blade retaining assembly. The electric motor includes an output shaft. The impact assembly is coupled to the output shaft and includes a hammer member and an anvil member. The blade retaining assembly is coupled to the impact assembly and includes a blade coupling configured to connect to a saw blade. The impact assembly is configured to operate in a first mode when a mechanical load on the blade retaining assembly is below a threshold value. The impact assembly is configured to operate in a second mode when the mechanical load on the blade retaining assembly is greater than or equal to the threshold value. The hammer member is maintained in a fixed position relative to the anvil member when the impact assembly operates in the first mode. The hammer member intermittently impacts the anvil member when the impact assembly operates in the second mode.Type: ApplicationFiled: August 22, 2011Publication date: February 28, 2013Applicants: Robert Bosch GmbH, Robert Bosch Tool CorporationInventor: Brian Haman
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Patent number: 8371032Abstract: A power tool comprises a crank pin that is eccentrically rotatable by a motor about a rotational axis. A non-rotatable first slider is linearly reciprocated by the crank pin so as to linearly reciprocate a tool. An eccentric pin is disposed substantially diametrically opposite of the crank pin relative to the rotational axis and is eccentrically rotatable by the motor about the rotational axis. A non-rotatable second slider is linearly reciprocated by the eccentric pin in a substantially opposite phase from the first slider so that the second slider acts as a counterweight to the first slider in order to reduce vibrations at least in the direction of linear reciprocation. A rotatable component is rotatably driven by the motor about the rotational axis and has a center of gravity displaced from its rotational axis towards the eccentric pin so as to supplement the vibration reducing function of the counterweight.Type: GrantFiled: June 14, 2011Date of Patent: February 12, 2013Assignee: Makita CorporationInventor: Shinji Hirabayashi
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Patent number: 8365419Abstract: A power tool having an elongated housing with a nose portion, an output shaft to which a cutting blade that oscillates through a small angle is attached, the attachment comprising, an accessory interface removably mounted to the nose portion of the housing and a depth guide attachment rotatably mounted to the accessory interface, the depth guide attachment further comprising a relatively thin body portion having a generally circular first opening with a center axis generally parallel to the output shaft, the body portion fitting on the accessory interface and being rotatable thereon and having a second circular opening transverse to the first opening center axis, a depth guide member adjustably mounted on the body portion and having an offset outer end portion, and a locking member configured to secure the depth guide member in a desired position.Type: GrantFiled: September 29, 2009Date of Patent: February 5, 2013Assignee: Robert Bosch GmbHInventors: Walter Bernardi, Leroy McCray, Michael E. Landt
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Publication number: 20130019483Abstract: A jigsaw includes a housing having a body portion and a handle portion. The body portion has a forward end and a rearward end. The jigsaw also includes a motor positioned within the body portion of the housing. The motor is located forward of the handle portion. The jigsaw further includes a drive mechanism positioned within the body portion of the housing. The drive mechanism is coupled to the motor for driving a saw blade in a reciprocating motion. The jigsaw also includes a shoe assembly coupled to the body portion of the housing between the forward end and the rearward end.Type: ApplicationFiled: March 30, 2012Publication date: January 24, 2013Inventors: Michael Naughton, Troy C. Thorson, Sean T. Kehoe, Steven G. Melnyk
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Patent number: 8347513Abstract: A hand-held saw with a rigid saw frame is disclosed. The rigid frame of the hand-held saw allows a saw blade to remain highly tensioned during the cutting process. The rigid saw frame has a “C-shape,” is unbent, and contains openings that make up a truss-like structure, which distributes an external force that is focused on one portion of the saw frame across other portions of the saw frame.Type: GrantFiled: December 21, 2010Date of Patent: January 8, 2013Inventor: Buster Lee Marshall
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Patent number: 8327550Abstract: A jigsaw drive shaft is connected to a blade by the blade clamp of the present invention. The blade clamp comprises a clamp body mounted securely to the drive shaft by a bracket. The clamp body has a hollow portion formed to receive an upper portion the jigsaw blade. The clamp body also includes a hollow tubular extension. A cam body is pivotable about an axis through a cylindrical bore such that cam surfaces move in and out of contact with an interior surface of the clamp body to engage or release the blade. A spring biases the cam body into engagement with the clamp body surface. The user must press on a protrusion of the cam body to pivot the cam surfaces way from the clamp surface and against the force of the spring.Type: GrantFiled: January 28, 2011Date of Patent: December 11, 2012Assignee: Black & Decker Inc.Inventor: Mike Wilson
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Patent number: 8327551Abstract: Embodiments of the present invention are directed to an attachment interface for a handheld power tool having an elongated housing and a rotary output shaft, the interface comprising a nose portion having a generally cylindrically shaped wall extending in the direction of the center axis to a flat annular surface, a plurality of screw threads formed in an outer surface of the wall configured to have an attachment device with a screw threaded collar mounted on the interface, and a first plurality of keys formed in an inner surface of the wall configured to receive have an attachment device with a second plurality of complementary keys, the engaged keys preventing rotation of the attachment device when the attachment device is mounted on the interface.Type: GrantFiled: February 4, 2010Date of Patent: December 11, 2012Assignee: Robert Bosch GmbHInventors: Kevin Wasielewski, Josh Barhitte, Timothy Baker
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Publication number: 20120297632Abstract: A cutting tool may include an outer housing that receives a motion conversion unit and a drive device therein. A cutting blade may be driven by the drive device via the motion conversion unit. A dust preventing device may prevent dust from reaching to the drive motor from between the outer housing and the motion conversion unit.Type: ApplicationFiled: May 24, 2012Publication date: November 29, 2012Applicant: MAKITA CORPORATIONInventor: Yasushi OGURA
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Patent number: 8307910Abstract: A drive apparatus for a reciprocating tool, including a housing, a rotatable drive shaft assembly located in the housing, an elongated spindle located in the housing for reciprocating motion, a front bushing in the housing for supporting the front end portion of the spindle, and a wobble drive mechanism. The wobble drive mechanism preferably includes a wobble drive shaft connected to the drive shaft assembly and an elongated arm having a lengthwise axis extending upwardly from the wobble drive shaft and including an upper interface for reciprocating the spindle generally in its lengthwise direction during alternating cutting and return strokes. The upper interface connects the arm to the spindle in a manner that prevents translational movement of the spindle relative to the arm in the direction of the arm lengthwise axis, but permits rotational movement thereof in three orthogonal axes.Type: GrantFiled: April 7, 2010Date of Patent: November 13, 2012Assignee: Robert Bosch GmbHInventors: Brad Holmes, Jaime Moreno
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Patent number: 8302519Abstract: A power tool includes an electric motor, a motor housing in which the electric motor is at least partially positioned, a blade drivably coupled to the motor for rotation about a first axis, and a blade housing in which the blade is at least partially positioned. The blade and the blade housing are pivotably coupled to the motor housing about a second axis substantially parallel to the first axis.Type: GrantFiled: January 14, 2009Date of Patent: November 6, 2012Assignee: Techtronic Power Tools Technology LimitedInventors: Robert E. McCracken, Ryan T. Harrison
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Patent number: 8291603Abstract: The invention relates to a handheld tool, in particular a handheld saw, with an electric drive motor (12), a serially switched gearbox (13), and a movement converter (14) that converts the driven movement of the gearbox (13) into an axial to-and-fro movement of a lifting element (15) for driving a tool (16), in particular a saw blade, inside a housing (11). The gearbox (13) and the movement converter (14) are combined into a gear unit (17). The gear unit (17) is within a robust, bending- and deformation-resistant gear housing (40), which is in turn inside the housing (11). The housing (11) is made of flexible plastic.Type: GrantFiled: July 14, 2010Date of Patent: October 23, 2012Assignee: Robert Bosch GmbHInventors: Daniel Saegesser, Sacha Felder
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Publication number: 20120240418Abstract: A pneumatically powered pole saw is provided, the pole saw having gas actuated main valves configured for movement between first positions and second positions wherein the gas actuated main valves are located in a main valves assembly fluidly coupled to the piston chamber; and a first pilot valve is configured to send actuating gas through a conduit to the main valves assembly and a second pilot valve is configured to send actuating gas through a conduit to the main valves assembly wherein the cutting blade moves in opposite directions in response to the actuating gas of the first and second pilot valves.Type: ApplicationFiled: April 16, 2012Publication date: September 27, 2012Inventor: Ronald Alan Gatten
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Patent number: 8272135Abstract: A saw blade clamping mechanism includes a saw blade spindle, a support sleeve, a clamping pin, and a rotating sleeve. The spindle has a longitudinal receiving slot and an axial elongate slot. The rotating sleeve has a retaining slot. A movable pin is secured on the rotating sleeve and extends through the elongate slot. A latch pin is fixed on the support sleeve and is held within the retaining slot. The rotating sleeve is movable from a first position to a second position. When the rotating sleeve is in the first position, the latch pin is positioned at an outer end of the circumferential section of the retaining slot and the clamping pin inserts into the longitudinal receiving slot of the spindle to fix a saw blade. When the rotating sleeve is in the second position, the latch pin is positioned at an upper end of the axial section of the retaining slot and the clamping pin retracts from the receiving slot of the spindle to release the saw blade.Type: GrantFiled: January 3, 2008Date of Patent: September 25, 2012Assignee: Chervon LimitedInventor: Hongtao Zhou
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Patent number: 8261455Abstract: An arcuate action tool attachment is adapted to receive an input and to convert that input into reciprocating output motion along an arcuate path. The tool may be adapted to be combined with an existing linear reciprocating device or a rotary device, or the tool may comprise a single unit including a linear reciprocating device or a rotary device. The tool may be fitted with one or more curved or arc-shaped accessories, such as saw blades or the like, that reciprocate along the arcuate paths that may have substantially the same radius of curvature as the accessory.Type: GrantFiled: January 24, 2008Date of Patent: September 11, 2012Inventor: Erik P. Henrickson
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Patent number: 8250768Abstract: A handheld power tool having a power tool that executes a reciprocating motion, in particular a reciprocating power saw with a reciprocating sawblade (14), is disclosed. To prevent the power tool from sawing untrue during the cutting operation, in particular between the upper and lower cutting edges, the power tool is assigned at least one force transducer (19), which measures the magnitude of a transverse force, oriented transversely to the direction of motion, that occurs at the power tool, and at least one actuator (21), which acts on the power tool as a function of the measured magnitude of the transverse force, is provided for transverse force compensation (FIG. 2).Type: GrantFiled: April 29, 2008Date of Patent: August 28, 2012Assignee: Robert Bosch GmbHInventors: Hans Kaiser, Stefano Delfini, Thilo Koeder, Martin Affolter, Joachim Platzer
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Publication number: 20120192438Abstract: It is an object of the invention to provide a technique for reducing vibration by counter weights which smoothly operate without linearly reciprocating, in a reciprocating power tool. The reciprocating power tool has first and second bevel gears 123, 147 which are opposed to each other on either side of a pinion 119 and rotationally driven in opposite directions at the same reduction ratio by the pinion 119. Further, the reciprocating power tool has a slider 107 which is caused to linearly reciprocate in a longitudinal direction of a tool bit 111 by a crank 129. The first and second bevel gears 123, 147 are provided with first and second counter weights 143, 145 in positions displaced from their rotation axes, respectively.Type: ApplicationFiled: June 7, 2011Publication date: August 2, 2012Applicant: MAKITA CORPORATIONInventors: Yonosuke AOKI, Shinji HIRABAYASHI
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Publication number: 20120192439Abstract: A tool has at least one point, at least one working edge, at least one edge, which connects to the point and is located opposite of the working edge and which has at least one first edge region that is straight and forms an inclination angle between 0° and 2.5° with the working edge. The edge has a second edge region, which has a different inclination than the first edge region.Type: ApplicationFiled: June 23, 2010Publication date: August 2, 2012Applicant: Robert Bosch GmbHInventor: Milan Bozic
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Patent number: 8230607Abstract: A reciprocating tool that includes a spindle that reciprocates with respect to a housing within a cavity of the housing. The reciprocating tool includes a blade clamp mechanism actuator coupled to the housing for movement with respect the housing between first and second positions. The spindle reciprocates with respect to the blade clamp mechanism actuator. A blade clamp mechanism is coupled to the spindle for reciprocating movement therewith, and the blade clamp mechanism is configured to attach the saw blade to the spindle. The blade clamp mechanism includes a collar mounted on the end of the spindle, and the collar is rotatable about the longitudinal axis of the spindle between an engaged position and a disengaged position in response to movement of the blade clamp mechanism actuator between the first position and the second position.Type: GrantFiled: May 8, 2009Date of Patent: July 31, 2012Assignee: Milwaukee Electric Tool CorporationInventors: Kurt Limberg, Roger D. Neitzell, Michael S. Steele
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Patent number: 8230605Abstract: Embodiments of a foot apparatus for use with a power reciprocating saw having a nose portion configured to receive the same, the apparatus comprising an elongated foot stem configured to be inserted into the nose portion of the saw a foot pad having a forward surface for contacting a work piece and having an opening through which a blade extends, a front housing having one end portion with a first pivot connection to the stem and an opposite end portion having a second pivot connection to the foot pad, a compliant element interposed between one of the foot pad and front housing and the stem configured to resist pivoting of the front housing relative to the stem and thereby isolate and dampen vibration and shock that is transmitted to the stem by reciprocating action of the plunger and by cutting of a work piece.Type: GrantFiled: September 15, 2009Date of Patent: July 31, 2012Assignee: Robert Bosch GmbHInventor: Stephen C. Oberheim
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Patent number: 8220165Abstract: A support arrangement for a reciprocating tool comprises a first locking surface adjacent to an adjustable foot guide. The foot guide includes a second locking surface designed to mesh with the first locking surface in a locking engagement. The support arrangement further comprises a lock actuator including a first cam profile. The lock actuator is provided adjacent to a cam plate which includes a second cam profile. The second cam profile is configured to interact with the first cam profile and force the first locking surface toward the second locking surface of the foot guide. The lock actuator is moveable between an unlocked position and a locked position, wherein a first raised surface of the first cam profile does not engage a second raised surface of the second cam profile in the unlocked position, while the first cam surface does engage the second raised surface in the locked position.Type: GrantFiled: January 31, 2008Date of Patent: July 17, 2012Assignee: Robert Bosch GmbHInventor: Jeff Gadams
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Patent number: 8205342Abstract: A reciprocating saw including a first end, a working end opposite the first end, and a housing extending between the first end and the working end. A reciprocating shaft is supported within the housing and has a longitudinal axis. A locking mechanism is supported at the housing and is selectively moveable between a first position and a second position. When the locking mechanism is in the first position the reciprocating shaft is configured to substantially reciprocate relative to the housing but remain substantially rotationally fixed relative to the longitudinal axis of the reciprocating shaft. When the locking mechanism is in the second position, the reciprocating shaft is configured to substantially reciprocate relative to the housing and at the same time substantially rotate about the longitudinal axis of the reciprocating shaft independent of the housing.Type: GrantFiled: December 23, 2008Date of Patent: June 26, 2012Assignee: Credo Technology CorporationInventor: Robert Doumani
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Patent number: 8201337Abstract: A reciprocating cutting tool configured for orbital cutting, includes a housing, a power source disposed in the housing, a main linkage connected to the power source and to a blade for driving the blade in a vertically reciprocating motion, a foot plate connected to the housing and including a portion in operational relationship to the blade, a swivel bracket connected to the foot plate and disposed to exert an orbital force to a rear edge of the blade. A plunger is secured within the housing and connected to the linkage for reciprocating, pivotal and rotational movement, and has an end configured for receiving a blade. A selector mechanism for selecting at least between pivotal and rotational movement of the plunger, wherein the pivotal movement relates to orbital blade motion, and the rotational movement relates to scrolling blade motion.Type: GrantFiled: January 18, 2007Date of Patent: June 19, 2012Assignee: Robert Bosch GmbHInventors: Ramon Tam, Jaime Moreno, Brian Ellis
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Patent number: 8191268Abstract: An apparatus for the cutting of tree limbs includes an extensible drive shaft that is detachably-attachable at one end to a portable electric drill and is secured to a housing at an opposite end thereof. The housing converts the rotary motion that is supplied by the drill into reciprocating motion of a saw blade and it disposes the saw blade at an angle with respect to the drive shaft that is slightly less than 90 degrees. An extensible two-part cylindrical outer sleeve covers the drive shaft and is detachably-attached at one end thereof to the drill and at an opposite end to the housing. A hook is provided in the housing and is used to grab and urge severed limbs where desired. An optional clamping mechanism is attached to the housing and is used initially to urge the blade and the limb toward each other during cutting and then to retain the limb proximate the housing after it has been cut for controlled placement and safe release of the limb.Type: GrantFiled: February 28, 2011Date of Patent: June 5, 2012Inventor: Peter Douglas Willetts
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Patent number: 8166660Abstract: A reciprocating saw having a housing, a reciprocating shaft unrotatably connected to a blade, a rear handle and a forward handle, the forward handle being rotatably mounted to the housing near the blade and capable of sliding relative to the reciprocating shaft, but incapable of rotating relative to the reciprocating shaft. The forward handle comprises at least one hole, the reciprocating saw further includes a button connected to a locking element for engaging or disengaging with the at least one hole. The reciprocating saw is easy and comfortable to operate.Type: GrantFiled: March 19, 2009Date of Patent: May 1, 2012Assignee: Chervon LimitedInventor: Hongtao Zhou
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Publication number: 20120096721Abstract: A reciprocating saw includes a motor and a drive shaft driven by the motor. The drive shaft defines a longitudinal axis. The reciprocating saw also includes a wobble plate coupled to the drive shaft. The wobble plate extends from the drive shaft at an oblique angle relative to the longitudinal axis. The reciprocating saw further includes a spindle coupled to and reciprocated by the wobble plate. The spindle has a stroke length. The reciprocating saw also includes an adjustment mechanism coupled to the wobble plate. The adjustment mechanism is operable to adjust the stroke length of the spindle.Type: ApplicationFiled: October 24, 2011Publication date: April 26, 2012Inventor: Robert A. Sinur
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Patent number: 8161655Abstract: A motor-driven, hand-guided reciprocating saw or jigsaw includes a saw blade which performs a working motion and a base plate which is connected to a housing of the reciprocating saw, where an underside of the base plate is used as a bearing surface which faces a workpiece to be worked, A guide element is intergrated in the base plate and extends past the bearing surface of the base plate. The guide element is provided for placement on a guide contour of a template which is connected to the workpiece. Saw teeth of saw blade are located at least approximately in the center of the guide element or are laterally offset from the center relative to the saw blade plane of the saw blade.Type: GrantFiled: September 20, 2007Date of Patent: April 24, 2012Assignee: Robert Bosch GmbHInventor: Rudolf Fuchs
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Patent number: 8156656Abstract: A hedgetrimmer having a housing, a motor located within the housing for driving a reciprocating blade for cutting vegetation. A front handle located at a front end of the housing and a rear handle located at a rear end of the housing. The rear handle having a trigger to actuate the motor, the rear handle being rotatable around a longitudinal axis of the housing. The rear handle is lockable at one of several positions so that a user can grip the two handles in the most comfortable position for the desired cutting operation.Type: GrantFiled: May 7, 2009Date of Patent: April 17, 2012Assignee: Black & Decker Inc.Inventors: Clare Tate, Matt Tollini
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Patent number: 8156655Abstract: A pneumatically powered pole saw, comprising: an extendable pole; a head member secured to the extendable pole; a cutting blade movably mounted to the head member; a piston linked to the cutting blade; a reciprocating valve disposed in the head member configured to release compressed gas into the piston chamber on one side of the piston when the reciprocating valve is in a first position causing the cutting blade to move in a first cutting direction, when the cutting blade reaches the limit of travel in the first direction, the reciprocating valve releases compressed gas into the piston chamber on another side of the piston causing the cutting blade to move in a second cutting direction.Type: GrantFiled: November 6, 2008Date of Patent: April 17, 2012Inventor: Ronald Gatten
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Patent number: 8146258Abstract: A saw can include a guide for guiding a saw blade. In one embodiment, the guide can be moveable between an active position wherein the guide guides a saw blade and an inactive position wherein the guide does not guide the saw blade. In one embodiment, the guide in the active position limits lateral movement of the blade, and the guide defines a clearance between the guide and the blade, the clearance having a height greater than a height of the blade, the saw being configured so that during cutting at least a portion of the article being cut can be accommodated within the clearance without contacting the guide.Type: GrantFiled: June 29, 2007Date of Patent: April 3, 2012Inventor: Paul Shafer
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Patent number: 8141257Abstract: A hand-held reciprocating power saw (10) includes a reciprocation member (21) for reciprocatingly moving a working tool, a compensation mass (22), a motor-driven eccentric wheel (23) having a first eccentric (24) for reciprocatingly displacing the reciprocation member (21) and a second eccentric (25) for reciprocating the compensation mass (22) along an axis (A), with the outer surface (28) of the second eccentric (25) engaging in an opening (26) provided in the compensation mass (22) and defined by a circumferential wall (27), and an intermediate member (30) arranged between the circumferential wall (27) and the outer surface (28) of the second eccentric (25) at least in the contact regions (41, 42), between the circumferential wall (27) and the outer surface of second eccentric, with the intermediate member (30) having a first radial extension (R1) oriented parallel to the axis (A) and a second radial extension (R2) oriented perpendicular to the axis (A) and greater than the first radial extension (R1).Type: GrantFiled: June 3, 2009Date of Patent: March 27, 2012Assignee: Hilti AkietengesellschaftInventor: Guenter Haas
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Patent number: 8136257Abstract: A cutting tool includes a working member power coupled to a power drive arrangement held by a housing. The housing includes a front housing portion from which the working member protrudes and a rear housing portion. A first handle includes a first hand-grip portion adapted for a user to hold the power tool at an operative level above the ground level, a second handle adapted for a user to generate a turning moment about the first handle so as to vary inclination of the working member relative to the ground level. The second handle includes a movable hand-grip portion which is attached to the rear housing portion. The rear housing portion is pivotally connected to the front housing portion, and the movable hand-grip portion of the second handle is arranged to pivotally move the rear housing portion relative to the front housing portion.Type: GrantFiled: September 5, 2007Date of Patent: March 20, 2012Assignee: Senson Investments LimitedInventor: Tak Chiu Alfred Lau
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Patent number: 8117757Abstract: A cutter adapter includes a holder having a receiving portion for inserting a cutter therein; a sleeve sleeved onto the holder and having an annular bevel; a lock pin inserted into the holder and having an active end and a passive end, the passive end being squeezed by the annular bevel when the sleeve is moved, the active end being inserted into the cutter when the passive end is squeezed; and a biasing pin located in the receiving portion and pushed by a spring mounted in the receiving portion. In this way, when intending to mount the cutter to the cutter adapter, the user only needs to insert the cutter into the receiving portion to force the biasing pin to disengage from the lock pin, the lock pin being forced by the annular bevel to insert the active end into the receiving portion to hold the cutter.Type: GrantFiled: April 10, 2009Date of Patent: February 21, 2012Assignee: Mobiletron Electronics Co., Ltd.Inventor: Tung-Chin Kuo
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Patent number: 8112895Abstract: A reciprocating saw has a locking element (9) for axially fixing the saw blade (5) in a fastening device, wherein a release device (10) is provided, with which the locking element can be displaced into its release position against the spring force of an adjusting spring. A component (12), acting upon the locking element, of the release device is arranged, with respect to the plane of the saw blade, on the same side as the locking element.Type: GrantFiled: April 5, 2007Date of Patent: February 14, 2012Assignee: Robert Bosch GmbHInventor: Janos Rakaczki
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Patent number: 8099872Abstract: The invention relates to a guide device (1) for a saw blade (2), in particular for an electric tool, which is operated in reciprocating motion (H) and which comprises a clamping device (4) engaging in the clamping end (3) of the saw blade (2), and a pendulum guide device (5) attached to the back of the saw blade and located at an axial distance (a) from the clamping device (4). According to the invention, the pendulum guide device (5) features at least two guide elements (6) which are arranged at an axial distance from each other. The invention further relates to an electric tool which features said guide device (1). Moreover, the invention relates to an electric tool with said guide device (1), in particular a jigsaw (23).Type: GrantFiled: April 3, 2007Date of Patent: January 24, 2012Assignee: Robert Bosch GmbHInventor: Marcel Casota
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Patent number: 8099873Abstract: An electric-powered cutting machine includes a reciprocable plunger held by and protruding outward from a housing; an operation member capable of being pivoted on the housing; and a blade holding mechanism disposed at a tip end portion of the plunger, the blade holding mechanism causing a blade to be detachably attached to the plunger. The operation member includes an operation portion and an abutting portion, wherein a distance from the operation portion to a rotating fulcrum is longer than a distance from the abutting portion to the rotating fulcrum. The blade holding mechanism is biased and is capable of swinging, and the blade holding mechanism includes a rotating member capable of being pressed against a side of the blade, wherein the abutting portion abuts against the rotating member when the operating member swings, and wherein the blade is detachably attached to the plunger by swinging of the rotating member.Type: GrantFiled: April 23, 2007Date of Patent: January 24, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Naoya Eto, Shinichi Sakuma
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Patent number: 8096055Abstract: A pendulum guide device for a power jigsaw saw blade that executes reciprocating motions includes guide elements that engage a saw blade spine of the saw blade and are associated with a support frame. A first two guide elements is fixed in place on the support frame and a second guide element is bearing-mounted to the support frame in moving fashion and is prestressed in the direction toward the saw blade spine.Type: GrantFiled: April 4, 2008Date of Patent: January 17, 2012Assignee: Robert Bosch GmbHInventors: Marcel Casota, Jingying Zhao
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Publication number: 20120005906Abstract: A power tool, particularly in the form of a keyhole saw as a hand-held power tool includes a work tool. A working line to be followed by the work tool with respect to the workpiece is optically provided by the power tool without contact being involved.Type: ApplicationFiled: December 11, 2009Publication date: January 12, 2012Applicant: Robert Bosch GmbHInventors: Thilo Koeder, Joachim Platzer
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Publication number: 20110314683Abstract: A power tool, particularly in the form of a keyhole saw, is provided with a sensor device that senses the position of the tool, in particular the reciprocating position of the saw blade in at least one of the reversal positions.Type: ApplicationFiled: October 22, 2009Publication date: December 29, 2011Applicant: Robert Bosch GmbHInventors: Thilo Koeder, Joachim Platzer
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Patent number: 8082671Abstract: A hand-held power jigsaw includes a clamping device which has an insertion slot (26) for a shaft (153) of the tool and has a transverse aperture (27) extending transversely to the insertion slot (26) and opening out into it. A clamping element (19) for clamping the shaft (153) can slide in the transverse aperture (27) and travels into the insertion slot (26) at one end and protrudes out from the transverse aperture (27) at the other end. A centering piece (18) has a rotatable clamping sleeve (20) equipped with a clamping curve (28) that slides the clamping element (19), equipped with a clamping spring, which engages the clamping sleeve (20) and rotates the clamping sleeve (20). The centering piece (18) has two transverse apertures (27) and in which two clamping elements (19) are supported opposite each other in a movable fashion.Type: GrantFiled: April 7, 2008Date of Patent: December 27, 2011Assignee: Robert Bosch GmbHInventor: Daniel Saegesser
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Patent number: 8069757Abstract: A cast-cutter for use in removing a cast from a patient comprises a body (20), cutting means (18, 148, 230) supported by the body (20), and a protection member (16, 204, 206, 236, 244) supported by the body (20) and adapted to be positioned between the cutting means (18, 148, 230) and the patient, to protect the skin of the patient. In one disclosed embodiment the cutting means cuts a cast by a shearing action. In another disclosed embodiment the cutting means cuts a cast by an abrading action.Type: GrantFiled: September 19, 2003Date of Patent: December 6, 2011Inventors: David J. Ross, George Miller
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Patent number: 8046926Abstract: A saw blade clamping arrangement for a power tool including a housing, a drive shaft mounted for reciprocating motion relative to the housing and having a longitudinal drive axis, and a saw blade releasably interconnected with the drive shaft. The saw blade clamping arrangement includes a blade support mechanism with first and second slots crosswise intersecting slots configured to selectively receive the saw blade in first and second orientations. The clamping arrangement also includes a tubular actuator rotatable about the longitudinal drive axis between an engaged position and a disengaged position, the actuator including a locking cam surface, and a locking member operatively associated with the actuator, and movable between a locked position that selectively locks the blade in one of the first and second orientations and an unlocked position that releases the blade, the locking member including a follower surface driven by the locking cam surface.Type: GrantFiled: December 6, 2007Date of Patent: November 1, 2011Assignee: Black & Decker Inc.Inventors: Jonathan D. Bigden, Joseph D. Anderson, Brian P. Wattenbach, Michael O'Banion
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Patent number: 8042275Abstract: A blade guard for a hedge trimmer that can cut trimmings from a hedge includes a cutting arm member with a first set of the cutting blades that extends laterally from the cutting arm member. The blade guard generally includes a first housing member and a second housing member movable between an open condition and a closed condition. A connecting member on the blade guard member that is operable to releasably couple to the cutting arm member. The first housing member and the second housing member in the open condition establish an opening between the first housing member and the second housing member. The blade guard in the open condition is operable to catch the trimmings in the opening between the first housing member and the second housing member. The blade guard in the closed condition is operable to cover the first set of the cutting blades.Type: GrantFiled: May 8, 2008Date of Patent: October 25, 2011Assignee: Black & Decker Inc.Inventor: Oleksiy Sergyeyenko
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Publication number: 20110247223Abstract: A reciprocating cutting tool includes a motion converting mechanism configured to convert rotation of a rotary member into a reciprocating motion of a slider coupled to a rod capable of mounting a blade thereon. The reciprocating cutting tool further includes a slider support mechanism including a first support mechanism and a second support mechanism disposed at different positions along a reciprocating direction of the slider and each supporting the slider such that the slider can move in the reciprocating direction. The first support mechanism includes a first member and a second member disposed on opposite sides of the slider in a holding direction perpendicular to the reciprocating direction and each slidably contacting the slider.Type: ApplicationFiled: April 11, 2011Publication date: October 13, 2011Applicant: MAKITA CORPORATIONInventors: Toshiyuki KANI, Masanori HAYASHI
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Patent number: 8033026Abstract: A jigsaw includes a housing containing a motor activated by a trigger assembly. A shoe member is pivotally connected to the housing of the jigsaw and establishes an angle therebetween. The jigsaw includes a keel assembly includes a blade member that generally extends from the housing beyond the shoe member. The keel assembly remains generally in line with the housing as the angle between the shoe member and the housing varies. The jigsaw also includes a latch assembly capable of retaining and releasing the keel assembly from the housing.Type: GrantFiled: September 21, 2007Date of Patent: October 11, 2011Assignee: Black & Decker Inc.Inventors: Louis A. Gibbons, John S. Vantran, Mark E. Robson, Timothy McKay, Brent A. Kuehne, Terry L. Turner, Michael F. Cannaliato, Thomas R. Kaye, Jr.
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Publication number: 20110239473Abstract: The invention relates to a jigsaw (1) having a saw blade receptacle (10) for fastening a saw blade (4) to the jigsaw (1) without a tool. The saw blade receptacle (10) comprises a clamping element (20), a counter piece (30) and at least one wedge (35) operatively connected to the clamping element (20), wherein the clamping element (20) by means of a displacement of the wedge (35) can be moved against a shaft (5) of the saw blade (4) that can be positioned between the clamping element (20) and the counter piece (30). The wedge (35) can be displaced approximately perpendicular to the movement direction of the saw blade (4).Type: ApplicationFiled: October 12, 2009Publication date: October 6, 2011Applicant: CEKATEC AGInventor: Marco Zurkirchen