Abstract: A power tool includes a handle (38) which allows the user to operate the tool via a trigger (44). The handle is arranged relative to the body (36) of the tool such that the user may operate the tool in a plurality of positions relative to a workpiece. The handle (38) is positioned such that a force applied thereto along a line of action allows operation of the tool along that line of action regardless of in which of the plurality of positions the power tool is held relative to the workpiece. Furthermore, the handle (38) is configured to be accessible from more than one side thereof each accessible side corresponding to a given one of the plurality of different positions.

Abstract: Two different eccentric shaft portions are formed on a secondary shaft. A contact plate has two different contact portions which are selectively brought into contact with two eccentric shaft portions of the secondary shaft. The contact plate is attached to a guide sleeve. A plunger is slidably coupled in the guide sleeve. A saw blade, attached to a front end of the plunger, causes an orbital motion according to a phase difference between two eccentric shaft portions regardless of attached direction (i.e., normal or upside-down) of the saw blade.

Abstract: A pneumatic power cutting tool is constructed to include an eccentric shaft, the eccentric transmission shaft having a first eccentric shaft and a second eccentric shaft eccentrically forwardly extended from the first eccentric shaft and adapted for reciprocating a cutter blade to cut the workpiece, a sliding block coupled to the first eccentric shaft by coupling means and adapted for sliding in a longitudinal sliding way in reverse to the reciprocation of the cutter blade to balance the centrifugal force due to the reciprocating motion of the cutter blade with the second eccentric shaft and to reduce the production of vibration and noise.

Abstract: A counterweight is provided to cancel axial vibration of a plunger of a saber saw. Swing rollers, rotatably supported at both ends of a roller shaft provided at a rear end of the plunger, interpose between a pair of opposing tracks formed in an axially elongated groove formed on the counterweight.

Abstract: A reciprocating cutting tool (1, 50) includes a slider (14, 51) that reciprocates linearly in a first direction. A rod or blade holder shaft (21) is movable with the slider (14, 51) in the first direction and is supported by the slider (14, 51) such that the rod or blade holder shaft (21) is movable in a second direction that is different from the first direction. A blade (B) can be mounted on the rod or blade holder shaft (21). The rod or blade holder shaft (21) is movable in the second direction independently of the movement of the slider (14, 51) in the first direction.

Abstract: A pendulum scroll saw including a lifting rod (1) for securing a saw blade (2), and a motor-driven entrain member (3) for reciprocating the lifting rod (1) with the lifting rod (1) having a guide surface (4) connectable with the entrain member (3), and with a contact region of the guide surface (4) with the entrain member (3) having a curved profile that deviates from a straight line.

Abstract: A method of reciprocating a spindle of a reciprocating saw, including the steps of reciprocating the front end of the spindle along a first path during the cutting stroke and along the same first path during the return stroke, and adjusting the saw such that the front end reciprocates along a second path during the cutting stroke and along the same second path during the return stroke, the second path being oblique to the first path. The present invention also provides a method of reciprocating a spindle of a reciprocating saw, including the steps of moving the front end along a first cutting path during the cutting stroke, the first cutting path characterized by movement at least partially in a first cutting direction, returning the front end along a return stroke (e.g., along the first cutting path), and adjusting the saw such that the front end moves along a second cutting path during the cutting stroke, the second cutting path characterized by movement at least partially in a second cutting direction.

Abstract: A reciprocating saw including a housing, a motor supported by the housing, a spindle mounted for reciprocation relative to the housing and having a front end for supporting a saw blade, the spindle being movable through a cutting stroke and a return stroke, the cutting stroke having a stroke length, and a pivot body interconnecting the spindle and the motor. The position of the pivot axis of the pivot body may be movable relative to the housing to change the stroke length of the spindle. A shock absorber may be operatively positioned between the motor and the front end of the spindle and may be at least partially mounted within the spindle.

Abstract: Reciprocating power tools may include a rotary member or crank disk (12) that is rotatably driven by a motor (M). The rotary member (12) may be operable to selectively rotate in a first direction or a second direction. A revolving member or connection (crank) pin (14) may be coupled to the rotary member (12) and have a longitudinal axis that is parallel to, but displaced from, the rotational axis of the rotary member. Preferably, the revolving member (14) revolves or orbits about the rotational axis of the rotary member when the rotary member (12) rotates. Further, the revolving member (14) is preferably movable relative to the rotary member (12) so as to change the distance between the revolving member (14) and the rotational axis of the rotary member (12). A motion conversion mechanism (13, 17) may convert the revolving movement of the revolving member (14) into linear reciprocating movement of a working tool (B).

Abstract: The present disclosure relates to a jig saw including a base structure, and a housing pivotally moveable relative to the base structure about a first axis that extends longitudinally along the base structure. A motor is positioned within the housing. The motor reciprocates a blade in an up and down motion. A connecting member extends between the housing and the base structure. The saw also includes a first wedge that cooperates with the connecting member to clamp the housing relative to the base structure. The first wedge is moveable to a first position in which the connecting member is caused to compress the housing and the base structure together such that pivotal movement between the housing and the base structure is inhibited. The first wedge is also moveable to a second position in which the housing can be manually pivoted relative to the base.

Abstract: A tool-less blade clamps (10, 50) may include a rod (2, 52) having a slot (2a, 2c, 52c) and a guide slot (2b, 52b) formed substantially perpendicularly to the slot (2a, 2c, 52c). A control member (20, 56) may be slidably disposed within the slot (2a, 2c, 52c) and a spring (21, 57) preferably biases the control member (20, 56) towards a forward portion of the slot (2a, 2c, 52c). The rod (2, 52) rotatably supports a sleeve (11, 53). Preferably, the sleeve (11, 53) being prevented from axially displacing with respect to the rod (2, 52) when the sleeve (11, 53) rotates about the rod (2, 52). An L-shaped slot (16, 53a) may be formed in the sleeve (11, 53) and may have a blade lock slot (16b, 53ab) disposed substantially perpendicularly to a blade lock control slot (16a, 53aa). The control member (20, 53) may include a pin (22, 55) that extends through the guide slot (2b, 52b) and travels within the L-shaped slot (16, 53a).

Abstract: A saber saw includes a housing. A motor is contained in the housing. A second shaft is rotatably connected to the housing, and is rotated by the motor. A plunger connected to the housing is used for holding a saw blade. The plunger is free to reciprocate. A motion converting mechanism provided between the second shaft and the plunger operates for converting rotation of the second shaft into reciprocation of the plunger. A guide member is connected to the housing, and has a track surface. The plunger is moved along the track surface of the guide member during reciprocation of the plunger.

Abstract: A counterweight is provided to cancel axial vibration of a plunger of a saber saw. Swing rollers, rotatably supported at both ends of a roller shaft provided at a rear end of the plunger, interpose between a pair of opposing tracks formed in an axially elongated groove formed on the counterweight.

Abstract: An adjustable cutting stroke length is provided by a wobble plate mechanism. A wobble plate mechanism imparts reciprocating linear action to a working end of a reciprocating motorized tool. A drive source is included that has an axially rotatable main drive shaft that is selectively rotatable in one of two opposite directions. The main drive shaft is configured to engage a wobble mechanism that provides the reciprocating linear action to the tool's working end. One of a first stroke and a second stroke is provided to the working end of the tool by the wobble mechanism. When rotation of the main drive shaft occurs in a first direction, the working end is provided with a first stroke. Furthermore, when rotation of the main drive shaft occurs in a second direction, the working end is provided with a second stroke. Elements used for adjusting the stroke length are placed on one axis only.

Abstract: A reciprocating saw including a housing, a spindle mounted for reciprocation relative to the housing and having a front end adapted to support a saw blade, the spindle being movable through a cutting stroke and a return stroke, a motor for moving the spindle in a reciprocating fashion, and a reciprocating member interconnecting the motor with the spindle. The motor and the spindle define a drive force path from the motor to the spindle and passing through drive force bearing components of the reciprocating saw, and wherein at least part of the reciprocating member is in the drive force path. The reciprocating member is configured to counterbalance the spindle. A pivot body interconnects the spindle with the motor. A shock absorber is operatively positioned between the motor and the front end of the spindle, and is at least partially mounted within the spindle.

Abstract: A hand-held reciprocating power tool, such as a reciprocating saw, wherein the angle of the reciprocation motion axis with reference to the longitudinal axis of the power tool motor housing is adjustable. Within a motor housing there is a motor driving a motor shaft which rotates on a motor shaft axis generally along the longitudinal axis. A nosepiece includes a nosepiece base portion fixed to the motor housing, and a nosepiece movable portion rotably mounted to the nosepiece base portion. The nosepiece moveable portion can be positionally adjusted relative to the nosepiece base portion over an angle of at least 180.degree. by rotation on a nosepiece axis which is perpendicular to the motor shaft axis. A reciprocating element is supported by the nosepiece moveable portion.

Abstract: An in-line oscillating cam assembly which includes a housing, a cam shaft having a longitudinal axis, and a pair of eccentric drive cams longitudinally spaced apart from each other and mounted on the cam shaft eccentrically out of phase. The pair of drive cams have opposed circumferential chamfered surfaces oriented at an inclined angle relative a plane perpendicular to the longitudinal axis of the cam shaft. The cam shaft is supported upon the housing and is also rotatable about the longitudinal axis. Further included in the assembly is a follower shaft spaced apart from and parallel to the drive shaft, and a cam follower longitudinally fixed to the follower shaft and extending between the pair of drive cams. The cam follower has a pair of opposed frustoconical follower-surfaces engaging the chamfered surfaces of the pair of drive cams. Thus, rotating one of the cam shaft and follower shaft causes the other one of the cam shaft and follower shaft to axially oscillate.

Abstract: A toolless blade clamp is disclosed for mounting a saw blade to the drive shaft of a reciprocating saw, such as a jigsaw. The clamp has a housing formed with a channel into which the blade may be inserted and an inclined track along which a roller is movable. The roller is biased by a spring into engagement with the blade during operation of the reciprocating saw. A release device, also attached to the spring, is pivotally mounted to the housing and may be rotated against the spring load from a locked position adjacent the housing to an unlocked position away from the housing. A pair of elongated links are pivotally connected to the release device and pivotally support the roller therebetween. The links act to translate rotation of the release device to movement of the roller, such that rotation of the release device to the unlocked position pulls the roller away from the blade allowing the blade to be removed from the channel.

Abstract: According to one aspect of the invention, a reciprocating saw 21, 154 comprises a housing 23, 154 pivotable about a first axis 29. A blade holder 49 is mounted for reciprocation along a second axis 53 perpendicular to the first axis. An angular blade drive train 61 is directly connected between a motor 43 and the blade holder. The angular blade drive permits the blade axis of reciprocation 55 to be adjusted in a plane parallel to the saw sidewalls 177. Drive train 61 consists solely of a rotary section 63 and a reciprocating section 65. The rotary section is connected directly between the motor and the reciprocating section. The reciprocating section is connected directly to the blade holder. According to a second aspect of the invention, a reciprocating saw 21,154 comprises a housing 23, a drive train 61, a blade holder 49, and a connector 59. Blade holder 49 is rotatably mounted in connector 59 for rotation about an axis 53 parallel to and spaced from an axis 55 of reciprocation of output bar 57.

Abstract: The saw includes a frame having an opening with a pair of proximate and distal blade retaining chucks located on respective sides of the opening. A saw blade is retained between the pair of chucks. A plurality of pulleys are attached in spaced relation to the frame including pulleys on opposed sides of the opening. A flexible band is entrained about each of the plurality of pulleys, with the band having a first end operatively connected to the proximate blade retaining chuck and a second end attached to the distal blade retaining chuck. A reciprocating drive is attached to the proximate blade retaining chuck. The reciprocating drive and the flexible band work in conjunction to pull the blade in opposite directions during each cycle of the drive. An alternative embodiment of the present invention may take the form of a stationary table saw.

Abstract: A hand-held reciprocating power tool, such as a reciprocating saw, wherein the angle of the reciprocation motion axis with reference to the longitudinal axis of the power tool motor housing is adjustable. Within a motor housing there is a motor driving a motor shaft which rotates on a motor shaft axis generally along the longitudinal axis. A nosepiece includes a nosepiece base portion fixed to the motor housing, and a nosepiece movable portion rotably mounted to the nosepiece base portion. The nosepiece moveable portion can be positionally adjusted relative to the nosepiece base portion over an angle of at least 180.degree. by rotation on a nosepiece axis which is perpendicular to the motor shaft axis. A reciprocating element is supported by the nosepiece moveable portion.

Abstract: A reciprocating saw having a main body and a spindle mounted in the main body and movable between a retracted position and an extended position. The saw further includes a biasing member operatively associated with the spindle. The biasing member can include a spring that acts on an inner end of the spindle to bias the spindle toward either the extended position or the retracted position.

Abstract: A reciprocating saw 10 includes a motor 17, a gear train 19, a drive shaft 15 and a blade clamp 13 for clamping a blade 11 in the saw. Clamp 13 includes sleeve 23 with first and second axially spaced and generally opposed projections 37, 39 for clamping an assembly 21 of blade 11 and drive shaft 15. A bias member 55 for clamping and unclamping blade 11 in sleeve 23 is adjustably attached to a top sidewall 33 of sleeve 23 and engages one side of assembly 21 at a location inwardly of first and second projections 37, 39. Bias member 55 forms a moment arm with a portion of sleeve 23 extending between the location of bias member 55 and first projection 37. Projection 37 serves as the fulcrum for the moment arm. The formation of a moment arm increases the effectiveness of the clamping action and more securely retains the blade 11 in the clamp 13.

Abstract: Hand tool with an apparatus housing (2) in which the are movably mounted a rotary portion (8) and a reciprocating slide (10) non-rotatably but displaceably mounted in the housing, said slide serving as a holder for a tool (12). The rotary portion (8) has an oblique shaft (32) with a rolling bearing device (36) mounted thereon, which converts the rotation of the rotary portion into a reciprocating movement of the displaceable portion (10). The rolling bearing device (36) comprises one or two rolling bearings with outer ring surface areas, via which the bearing device is in direct driving contact with a driver element (52) at the end of the displaceably mounted slide (10). The driver element (52) is in direct engagement with the outer rings (48, 50) of the bearing device via opposite lateral surfaces (54, 56).

Abstract: A reciprocating saw including a housing, a spindle mounted for reciprocating motion within the housing, a gear rotatably mounted within the housing, a wobble shaft rotatably mounted within the housing, a wobble plate rotatably mounted on the wobble shaft and connected to the spindle, and a clutch drivingly connecting the gear to the wobble shaft. The clutch includes a clutch driver rotatably positioned within the housing adjacent the wobble shaft, and the clutch driver includes a recess for insertably receiving a portion of the wobble shaft. The clutch driver can also include a relief ledge for providing clearance between the clutch driver and the wobble plate. The clutch can further include a first clutch disk connected with the gear and positioned between the gear and the clutch driver, and a second clutch disk connected with the clutch driver and positioned between the gear and the first clutch disk.

Abstract: A compass saw has a lifting rod for receiving a saw blade which extends downwardly beyond a base plate and supported under the base plate in the region of a saw blade back. A supporting element is formed as a sword extending parallel and in alignment with the saw blade. The saw blade is secured from lateral deviation and bending in that the sword is turnable about an axis located above the base plate and extending substantially parallel to the base plate.

Abstract: An apparatus for reciprocatingly orbiting a saw blade with respect to a workpiece is provided. The saw blade is cammingly driven through a cam track to reciprocate the saw blade generally along a first axis to saw the workpiece. The saw blade is contemporaneously driven through a bearing to move the saw blade about a pivotal axis to space the saw blade from the workpiece when it is not being sawed. Cam tracks of irregular configurations are provided for improving cutting efficiency.

Abstract: A jig saw includes a housing and a drive shaft disposed within the housing and driven to perform a predetermined motion. A holder is mounted on the drive shaft and includes an operation member operable between a fixing position and a releasing position for fixing and releasing a saw blade, respectively. A cover is mounted on the housing and is movable between an open position and a closed position for uncovering and covering the holder, respectively. An interlocking mechanism is provided for interlocking between the operation member and the cover such that the operation member is moved from the fixing position to the releasing position when the cover is moved from the closed position to the open position.

Abstract: The housing of the reciprocating saw includes rectilinear guide bars mounting a drive block for reciprocating movement by the motor of the power tool. The drive block has a recess defining arcuate cam surfaces. A blade clamp has a cam follower engaging the arcuate cam surfaces of the drive block. When the blade engages the work, relative movement between the cam follower and the arcuate cam surfaces on the drive block causes orbital movement to be imparted to the working end of the saw blade. Means are provided for clamping the blade holder to the drive block in two different positions. This clamping deactivates the orbital mechanism and permits the blade to be locked in two different cant positions relative to the axis of reciprocation of the drive block.

Abstract: The drive mechanism for imparting reciprocating movement to the tool plunger includes first and second drive members. The first drive member is mounted on an eccentric formation which is in turn mounted on a drive shaft thereby to impart a wobbling movement to the first drive member. The second drive member is in the form of a piston mounted for reciprocating movement within a bore formed in the first drive member. The second drive member is pivotally connected to the plunger. The second drive member has a helical groove in its exterior surface. A lubricant is forced along the groove in part due to the reciprocating movement of the second drive member in the bore of the first drive member.

Abstract: A reciprocating saw is provided with a blade-clamping arrangement having the blade clamped by its thin edges between a pair of wedge-shaped jaws carried in a tapered sleeve at the end of the reciprocating drive shaft of the saw, the clamping of the jaws being effected by turning a non-reciprocating knob carried on the head of a saw and the knob being operably connected to the clamping jaws by a two-part stem of which the two-parts are mutually reciprocable whilst being restrained so that they can only be rotated as a unit.

Abstract: A chuck mechanism is described, which is easy to handle with a chuck clamping handle of increased diameter and is capable of achieving smooth movement of its reciprocally movable portion of reduced weight and assures safe operation with the least exposure of outwardly moving portion. Rotating a knurled portion of a body case rotates an intermediate transmission member which in turn rotates a slide shaft stopping member to tighten or loosen its engagement with a slide shaft, causing clamping or releasing of a collet chuck. The slide shaft, slide shaft locking member, chuck and a saw can reciprocally move as a single unit.

Abstract: The invention relates to an electric hand tool comprising a housing, a reciprocating carrier for an operating member drivable by means of an electric motor placed in the housing, wherein the carrier is guided by at least two guide members fixed in the housing, wherein the guide members each comprise two guides placed on either side of the carrier, wherein one of the guides is fixedly attached and the other guide is provided with means for urging the guide against the carrier.The occurrence of play, wear, noise nuisance and vibrations is thus avoided.According to a preferred embodiment, both guides forming part of a guide member are formed by guide rollers received in a frame and the frame is fixedly mounted by means of a shaft extending through one of the guide wheels and a spring is placed between the housing and the frame such that the spring urges the other guide wheel into contact with the carrier.

Abstract: A reciprocating saw includes a body and a slider supported by the body such that the slider is slidably movable in a longitudinal direction of the body and is pivotally movable in a vertical direction. A first motion conversion mechanism is operable to convert the rotational movement of the rotary member into a reciprocal movement of the slider in the longitudinal direction. A second motion conversion mechanism is operable to convert the rotational movement of the rotary member into a reciprocal pivotal movement of the slider in the vertical direction. The second motion conversion mechanism includes an arm having one end vertically pivotally connected to the slider. An actuating member is rotatable with the rotary member and has an abutting surface on which the other end of the arm slidably abuts. The abutting position of the other end of the arm on the abutting surface is varied as the actuating member is rotated, so that the vertical position of one end of the arm is varied.

Abstract: A powered coping saw has a frame that includes a first leg, a second leg and a third leg. A blade is reciprocally movable in a first and second direction with respect to the frame. First and second blade mounting brackets are provided for mounting the respective first and second ends of the blade. A blade driver is coupled to both the first and the second blade mounting brackets for actively driving both the first and the second ends of the blade in both the first and the second directions. The blade driver includes a motor, a transmission, a first drive member, and a first pivoting arm member. The first pivoting arm member has a first end pivotally coupled to the first drive member, and a second end. A reciprocally moving arm member has a first end pivotally coupled to the second end of the first pivoting arm member, and a second end. A second pivoting arm member has a first end pivotally coupled to the second end of the reciprocally moving arm member, and a second end.

Abstract: A power transmission device for converting rotational movement of a rotation shaft into reciprocal movement in an axial direction of the rotation shaft. This device comprises a bevel gear for converting rotation of the rotation shaft into rotational movement of a-second rotation shaft, a-first eccentric shaft turnable with an eccentricity to the second rotation shaft, a-second eccentric shaft turnable with an eccentricity of 180.degree. apart from the first eccentric shaft, a-first reciprocating member reciprocally movable in the axial direction only of the rotation shaft in response to the rotational movement of the second eccentric shaft, and a-second reciprocating member reciprocally movable in the axial direction only of the rotation shaft in response to the rotational movement of the first eccentric shaft. The second reciprocating member exerts a damping effect on the first reciprocating member.

Abstract: A fret-saw machine comprises a base unit having a table on which a workpiece to be cut is placed, a frame member disposed in the base unit and secured to the table, an arm member having one end portion secured to the frame member and another end portion disposed above the table, a blade holder assembly having first and second slide holder units and first and second blade holder units, the first slide holder unit and the first blade holder units being disposed in the base unit and secured to the frame member and the second slide holder unit and the second blade holder unit being secured to another end portion of the arm member, blade supported at its both ends by the first and second blade holder units and a drive unit supported in the base unit by the frame member and connected to the first slide holder unit to drive the blade. The blade holder unit has a blade nipping member for firmly nipping the blade.

Abstract: An apparatus for connection to a reciprocating saw changes the direction in which cutting takes place from the reciprocating direction of the saw to a different direction. A first push rod is connected to the saw bar for linear movement in the reciprocating direction of the saw. A second push rod having a saw blade connected thereto is arranged for linear movement in a direction different than the reciprocating direction of the saw. A transmission disposed between the push rods transmits the reciprocating movement of the first push rod to a corresponding reciprocating movement of the second push rod, thereby imparting a cutting motion to the saw blade. The reciprocating direction of the second push rod with respect to the first push rod can be either fixed or adjustable. Optionally, the apparatus can be pivotably connected to the saw so that the angular disposition of these elements with respect to one another can be adjusted as desired.

Abstract: A lightweight power tool includes a housing having a handle and an implement projecting form the housing. A drive mechanism is included as part of the housing for moving the implement relative to the housing. A power source that includes an electric motor is disposed at a location removed from the housing. A flexible power transmission line connects the housing and the power source. The housing includes a transmitter for generating an on-off signal, which transmitter is activated by a manual switch included as part of the housing. The power source includes a receiver for receiving the on-off signal generated by the transmitter. Because the power source is not included as part of the housing, the housing is very lightweight and maneuverable. Accordingly, the power tool can be manipulated conveniently by handicapped persons, those having small hands, or those having less than average strength.

Abstract: A flexible extension for a hand held power tool is disclosed. The extension has a single flexible reciprocating rod to transmit motion generated by the power tool to a cutting tool at the other end of the extension. A handle grip assembly surrounds the extension adjacent the reciprocation tool. In use, the operator holds the power tool in one hand and the handle grip in the other. The extension permits useful work to be done in close quarters or an otherwise inaccessible location.

Abstract: A jigsaw blade (4) having diametrically opposed bayonet lugs (10) is retained within a bayonet fitting (6) provided on the end of a jigsaw drive shaft (3) by a locking device, which can be moved to permit removal of blade without the use of a separate tool. In one embodiment the locking device comprises a locking member (13) which engages the upper end (11) of the blade and is biased towards the blade by a spring (14). A tension member (18) is connected to the locking member (13) and to a manually operable tensioning device, whereby the locking member (13) may be lifted to compress the spring (14) until lugs (17) on the locking member (13) are clear of entry slots (6) of the bayonet fitting. The blade (4) may then be rotated to align the lugs (10) with the entry slots (8), and the blade removed. In an alternative embodiment, the locking member is a screw which engages the upper end (11) of the blade, and is rotatable by a screw rotating member with which it is in permanent sliding engagement.

Abstract: This invention relates to saw blades for use in reciprocating hand-manipulated saws. The blades of the invention have a straight, untoothed edge lying parallel to the longitudinal axis of the blade and a toothed edge wherein at least 30% of the toothed edge is curved.

Abstract: A motorized reciprocating tool unit releasably receives a saw, file or like tools and includes a counterweight unit to stabilize system operation. The is greater than a weight necessary to compensate for the forces created during the working action. A variable counterbalance weight unit may be used to create during the tool operation to compensate for the changes in the reactive loading characteristic. The variable compensation counterweight unit includes a counterweight which is slidably mounted and a pivoting lever moving the counterweight in an opposite direction from that of the tool holder and drive. In the variable unit, the tool holder is mounted for pivotal movement and is spring loaded to the standby position such that work reaction forces deflect the tool and holder resulting in a relocation of the lever coupling to the counterweight unit. The ratio of the length of the lever arm varies to change the stroke of the counterweight and the counterbalance forces.

Abstract: A non-binding wire saw having a back and forth cutting motion is disclosed. The saw is power driven and is found suitable for light duty such as tree trimming operations.

Abstract: A transmission mechanism for a scroll sawing machine is disclosed. An upper counter weight and a horizontal counter weight are secured to the lower end of a rocker arm, which has its top end secured to the scroll saw blade upper driving arm, and carried to move by the transmission shaft of a motor. The rotation of the transmission shaft of the motor drives the upper counter weight to rotate so as to eliminate any possible vertical shock waves, and simultaneously drives the rocker arm to move up and down so as to eliminate any possible horizontal shock waves.

Abstract: A saber saw comprises an elongated displacing rod which supports a saw blade and is reciprocable in a displacement direction extending along its elongation and also swingable in a swinging direction which is transverse to the displacement direction, and a unit for moving the displacement rod in the swinging direction and including a driveable control element having a cam surface and a sensing element which is connected with the displacement rod and is controlled by the control element, the control element being rotatable about an axis of rotation, the cam surface of the control element being formed as a symmetrical conical surface which is eccentrical relative to the axis of rotation of the control element.

Abstract: A reciprocating tool, comprising a drive source and a tool holder for holding a grinding/cutting tool capable of reciprocation, the reciprocation drive source including a driving shaft, a driving bevel gear mounted on the driving shaft, a first shaft extending at right angles to the moving direction of the grinding/cutting tool, a driven bevel gear supported by the first shaft and in mesh with the driving bevel gear, a second shaft coaxially facing the first shaft, a third eccentrically connecting the first and second shafts, a bearing mounted on the support shaft, and a reciprocating member coupled to the tool holder, the reciprocating member having a slot extending at right angles to the moving direction of the grinding/cutting tool so as to engage the bearing.

Abstract: An improved saw blade assembly (22) for use with heavy duty reciprocating power saws (10) is provided which includes a stationary, slotted blade support (24), as well as a reciprocable, U-shaped in cross-section blade (26) equipped with a crosspin (50) adapted for sliding receipt within said plate slot (38). The blade includes flanges (46,48) preferably extending essentially the full length of the cutting surface (42) of the blade (24), and moreover are of a height to provide substantial lateral support, thereby minimizing the occurrence of plate breakage during rugged use, e.g., in bone cutting operations.

Abstract: A reciprocating saw including a housing, a spindle mounted for reciprocating motion within the housing, a gear rotatably mounted within the housing, a wobble shaft rotatably mounted within the housing, a wobble plate rotatably mounted on the wobble shaft and connected to the spindle, and a clutch drivingly connecting the gear to the wobble shaft. The clutch includes a clutch driver rotatably positioned within the housing adjacent the wobble shaft, and the clutch driver includes a recess for insertably receiving a portion of the wobble shaft. The clutch driver can also include a relief ledge for providing clearance between the clutch driver and the wobble plate. The clutch can further include a first clutch disk connected with the gear and positioned between the gear and the clutch driver, and a second clutch disk connected with the clutch driver and positioned between the gear and the first clutch disk.

Abstract: A reciprocating saw including a housing, a spindle mounted for reciprocating motion within the housing, a gear rotatably mounted within the housing, a wobble shaft rotatably mounted within the housing, a wobble plate rotatably mounted on the wobble shaft and connected to the spindle, and a clutch drivingly connecting the gear to the wobble shaft. The clutch includes a clutch driver rotatably positioned within the housing adjacent the wobble shaft, and the clutch driver includes a recess for insertably receiving a portion of the wobble shaft. The clutch driver can also include a relief ledge for providing clearance between the clutch driver and the wobble plate. The clutch can further include a first clutch disk connected with the gear and positioned between the gear and the clutch driver, and a second clutch disk connected with the clutch driver and positioned between the gear and the first clutch disk.