Abstract: A blade mounting device is operable for mounting a blade on a drive shaft of a cutting tool which is moved in a predetermined motion for a cutting operation. The blade mounting device includes an operation knob mounted on a body of the cutting tool and adapted to be rotated by an operator. An actuation rod is mounted on the drive shaft and is movable with the drive shaft and rotatable relative to the drive shaft. A holder device is mounted on the drive shaft for holding and releasing the blade in response to the rotation of the actuation rod relative to the drive shaft. A connection member is rotatable with the operation knob and is disposed on the same axis as the actuation rod. A connecting mechanism is provided for connecting the connection member and the actuation rod to each other, so that the connection member and the actuation rod are axially movable relative to each other and are rotatable together with each other.

Abstract: A compact drill attachment or device for converting rotary drill motion to reciprocating saw action and adapted to be used in conjunction with cordless, electric and pneumatic hand held drills. A practical and extremely versatile tool to accomplish sawing results that were before inconceivable. Featuring a plurality of different reciprocal flush cut options, a plurality of entries from a power source to accomplish close quarter sawing, a blade stroke distance which exceeds the competition, a cutting stroke which is faster than the cleaning stroke, a plurality of shoe or fence settings, and which accepts major brands of reciprocal saw or jigsaw blades.

Abstract: A ring blade and drive system, and method of using same, for harvesting bone-tendon-bone ligament grafts having substantially cylindrical bone plugs. The ring blade disclosed is a circular ring having a predetermined arcuate gap formed in its periphery. The drive system includes a blade holder to peripherally hold the ring blade and a fixed-center oscillating mechanism to oscillate the ring blade about its axis within a predetermined arcuate range of motion. The ring blade structure enables the production of a substantially cylindrical bone plug of unlimited length. Harvesting of a bone-tendon-bone ligament graft is facilitated with the ring blade and method disclosed which enables the ring blade to be placed partially around a tendon segment to create bone plugs aligned with the tendon fibers included in the defined tendon segment. The cuts into the bone may be initiated into the bone at either end of the tendon segment from the tendon side through to the exterior of the bone to which the tendon is attached.

Abstract: A jig saw 30 includes a housing 32 and a keyless shoe 54 which can be adjusted relative to the housing to selectively position a cutting blade 48 for effecting a cut perpendicular to the plane of a workpiece 66, or a cut which is bevelled with respect to the plane of the workpiece. A locking mechanism 58 includes a lever 60 which is formed with a locking section 170 having a wide cross section portion and a narrow cross section portion. When making an adjustment, the locking mechanism 58 is unlocked by pivoting the lever 60 so that the narrow portion of the locking section 170 is in a prescribed alignment. After making the adjustment to a desired relative orientation and position between the housing 32 and the shoe 54, the lever 60 is pivoted to the locked position. In this position, the wide portion of the locking section 170 is placed in a prescribed alignment whereby the components of the locking mechanism 58 are locked, or tightened.

Abstract: A reciprocating saw having a main body, a reciprocating spindle extending from the main body, and a saw blade connected to the spindle and including a cutting edge for cutting the workpiece. A shoe is pivotally mounted relative to the main body at a pivot axis, and a shoe support extends from the main body to pivotally support the shoe at the pivot axis. The pivot axis is substantially adjacent to the cutting edge such that the pivot axis moves through the workpiece at substantially the same time as the cutting edge. The shoe support includes a post connected to and extending from the body, and a yoke connected to the post, the yoke including two leg portions pivotally connected to the shoe. The shoe is pivotally mounted at a pivot part that is recessed inwardly from a side guide surface. The shoe includes an indicator in alignment with the saw blade to facilitate alignment of the saw blade with a mark on the workpiece.

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: An apparatus is provided for attachment of a saw blade to the plunger of a jigsaw. The apparatus includes a clamping body and a clamping member which includes a lever which has an eccentric surface which bears against the saw blade. A tension spring utilizes the mechanical advantage of the lever to provide increased holding force on the saw blade.

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 cutting chip suction device is adapted for sucking cutting chips produced when a work is cut by a blade of a cutting tool. The device includes a duct and a duct mounting mechanism. The duct has one end connected to a dust collector and having the other end formed with an opening. The duct mounting mechanism is adapted for mounting the duct on the cutting tool and permits the duct to be selectively mounted on the cutting tool in a first position and a second position on both sides of the blade. The opening of the duct in said first and second positions is positioned adjacent a cutting position where the work is cut by the blade.

Abstract: A rotary saw having a housing equipped with a laser beam generator and an end cap with a slit through which a laser beam projects in alignment with a rotating cutting blade of the saw. The housing is mounted on the body of the saw immediately over the blade guard and the end cap is rotatably disposed on the housing whereby the emitted laser beam from the slit may be directed in alignment with the saw blade cut anywhere along a 180 degree angular path extending from the line of cut in front of the saw blade to a target remotely located above the saw. The saw blade can be directed to follow the target in order to align the cut with the target.

Abstract: A blade mounting device is operable for mounting a blade on a movable member of a cutting member which is moved in a predetermined motion for a cutting operation. The blade mounting device includes a pair of claws mounted on the movable member and operable by an operator between a closed position for clamping the blade and an open position for releasing the blade. A first and a second thread mechanism are provided for converting the rotation of the actuation member into an axial movement of the actuation member relative to the movable member and for converting the rotation of the actuation member into an axial movement of the claws relative to the actuation member.

Abstract: A saw blade clamping arrangement particularly for power reciprocating saws and similar tools having a reciprocating shaft connected to a cutting member includes a biasing member preferably in the form of a spring clamp member. The biasing member is interconnected with the drive shaft and operative for providing a biasing force to retain the cutting member in operative connection with the drive shaft. A release lever is pivotally mounted to a housing of the saw for movement between first and second stable position. In the first position the release lever is spaced apart from the biasing member. In the second position the release lever engages the biasing member and opposes the biasing force of the biasing member to permit quick and easy removal and replacement of the saw blade.

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: A cutting tool such as jigsaw generally comprises a main body, a plunger provided for the main body to be reciprocally movable in an axial direction thereof, the plunger being provided with an opening and a cutout axially formed to a portion opposing to the opening, a cutting blade to be mounted to the plunger, and a blade mounting mechanism for mounting the blade to the plunger.

Abstract: A windshield removal apparatus that includes a suction cup assembly that is secured, via a vacuum, onto the interior center portion of an automobile's windshield. A swivel head is located at the opposite end of the assembly where the vacuum interface is initiated. The swivel head rotates bi-directionally 360 degrees in approximately the same plane as that of the windshield. The rotation of the swivel head is relatively friction free. A spring is located between the swivel head and the cutting wire which is in turn attached to a grip, to complete the configuration of the apparatus. The cutting wire is initially threaded through the seal between the windshield and automobile. The connection of the cutting wire to the spring and swivel head may take place in any order such that the apparatus is in the appropriate position to commence the cutting process of the entire perimeter of the seal.

Abstract: A reinforced pneumatic tool holder includes: a handle having a sliding sleeve secured in a front portion of the handle, and a tool clamping device generally formed with an elastomer block for clamping a pneumatic tool such as a saw blade or a file on the tool clamping device reciprocatively held in the sliding sleeve of the handle for manipulating the pneumatic tool, with a reinforcing member integrally formed in an elastomer block for reinforcing the tool clamping device for firmly fixing the tool and a piston rod in the elastomer block for absorbing shock, preventing loosening and for sustaining a great working pressure of the tool, and also for preventing injury to a worker when operating the tool.

Abstract: Disclosed herein is an impact absorption mechanism and a power tool including an impact absorption mechanism. When a tool bit binds a high energy impulse of short duration is generated that may damage components of the power tool. The impact absorption mechanism absorbs this high energy impulse and prevents damage to other components of the power tool.

Abstract: A device to change the rotation of a shaft such as in an electric hand drill to the reciprocating motion necessary to power a saw blade. The reciprocating attachment has a grooved shaft and saw blade holder connected by a bearing all of which are contained in a housing. As the grooved shaft is rotated the shape of the groove in the grooved shaft causes the saw blade holder to move in a reciprocal manner in a groove in the housing. This provides the motion necessary to use a hand drill to saw an object. Alternative versions of the device include the widening of the groove in the grooved shaft with the saw blade holder having a holder pin and an end retained in a holder groove to cause the reciprocal motion. In addition, an inclined disk may be mounted on the rotating disk shaft to engage the saw blade holder slot to cause the reciprocal motion.

Abstract: A hand machine tool operated with two hands has a machine housing composed of insulating synthetic plastic shells, a fixed, web-shaped main handle formed as a part of the machine housing, an auxiliary handle, a drive including a motor and a transmission, at least one inner housing accommodating the motor and the transmission and surrounded by the synthetic plastic shells, and a tool driven by the drive. The handles, the machine housing, the inner housing and the tool are arranged so that forces applied to at least one of the handles are withdrawn from the machine housing by transferring the forces by the main handle directly to the inner housing without deforming the machine housing and then transferring the forces from the inner housing to the tool.

Abstract: The drill attachment is a cordless, electric or pneumatic drill device having three (3) flush cut features which enables user to saw in a reciprocating action. A compact metal enclosure has steel bevel gears together to generate perpetual motion onto an eccentric peg to drive arm to blade. The rotation of the drill enters the tool by the removable hexagonal shaft which can be inserted into the tool at three (3) different angles depending on the task. The small bevel gear meshes with a larger bevel hub gear having an eccentric peg that is inside an elongated slot of the blade drive armature. As the small bevel gear rotates, its speed is increased by ratios in the larger bevel hub gear; the rotation of the larger bevel hub gear is converted to a linear reciprocating motion which drives the blade.

Abstract: A reciprocating acting tool includes a disc rotatably received in a housing and includes a shaft slidably engaged in the upper portion of the housing. The disc includes a bolt rotatably engaged in a groove and a slide threadedly engaged with the bolt. The slide includes a stud for rotatably supporting a follower which is slidably engaged with the shaft. The slide is moved longitudinally along the groove so as to adjust a moving stroke and a moving speed of the shaft. The shaft is moved quickly for driving a cutting tool and is moved slowly for moving a saw blade or a file.

Abstract: A clamping system for attaching a saw blade to a blade carrier of a reciprocating saw includes a clamp member having a tubular body and a hollow interior. The clamp member is mounted on the free end of a blade carrier which has a longitudinal slot for receiving the shank of a saw blade. The free end of the blade carrier has an aperture in its side wall. In a preferred embodiment a ball is received within the aperture and freely movable therein. The inner surface of the clamp member has an eccentric groove which defines a camming surface engaging the ball. Upon rotation of the clamp member to a locking position the ball engages an aperture in the shank of the blade to hold the blade in place. The clamp system is designed to accept saw blades having standard universal designs. In another preferred embodiment a pin is received within the aperture in the blade carrier. The pin has a first end which is adapted to be received within the aperture in the shank portion of the saw blade.

Abstract: A quick release chuck device for releasably holding a jaw blade includes a body member having an internal longitudinal bore defined therein. The longitudinal bore has a substantially rectangular cross-section shape for receipt of conventionally sized saw blades. At least one radial bore is defined in the body member and is in communication with the longitudinal bore through one of its short sides. An engaging device is disposed in the radial bore and is movable radially within the radially bore so that at least a portion of the engaging device extends into the longitudinal bore in a locking mode of the chuck device to hold a saw blade within the device through contact with a recess defined in the edge of the blade. A spring-biased outer sleeve is disposed about at least a portion of the body member. The outer sleeve is movable longitudinally between a released position and a locking position.

Abstract: Disclosed herein is a reciprocating saw including a housing, a shaft rotatably mounted in the housing, a motor, a spindle reciprocally supported by the housing, a wobble plate mounted on the shaft and connected to the spindle and converting rotational motion to reciprocal motion, and a clutch drivingly connecting the motor to the shaft and providing slippage between the motor and the shaft if there is binding of the spindle.

Abstract: A cordless, electric or pneumatic drill device which enables user to saw in a reciprocating action. A compact metal enclosure having steel helical and worm gears together with eccentric peg to drive arm to blade, the rotation of the drill enters the tool by the removable hexagonal shaft which can be inserted into the tool at three (3) different angles depending on the task. The worm gear meshes with a helical gear having an eccentric peg that is inside an elongated slot of the blade drive armature. As the worm gear rotates its speed is exchanged for torque in the helical gear the rotation of the helical gear is converted to a linear reciprocating motion which drives the blade.

Abstract: The electrically operated reciprocating tool includes a housing with a counterbalanced single throw crankshaft mounted for rotation within the housing. The crankshaft rotates on a central shaft, and includes a weighted counterbalance section extending radially on an opposite side of the shaft and is pivotally connected to one end of an elongate drive link. The opposite end of the drive link is pivotally connected to a reciprocable unit mounted for movement in a raceway formed in the housing. A battery powered drive unit mounted in the housing is connected to rotate the crankshaft.

Abstract: The reciprocating saw has a motor driven assembly which operates in the nature of a wobble plate. One end of the assembly is connected to a spindle for reciprocating the same. The other end of the assembly is connected to a counterweight whereby the spindle and the counterweight are simultaneously reciprocated in opposite directions. The counterweight is generally U-shaped such that its center of gravity is located near the spindle.

Abstract: A branch trimmer comprises a momentum converter for converting rotary motion of the output of a power source into linear reciprocation; a saw blade being slidably reciprocated in a longitudinal direction thereof under the application of power transmitted from the momentum converter; a gear case body for accommodating a base portion of the saw blade and the momentum converter; and a gear case cover for covering a bottom portion of the gear case body. The gear case cover is divided into plural parts, a first divided gear case cover part is formed such that the outline thereof is a slightly larger than the outline of the base portion of the saw blade disposed in the gear case body when the saw blade is maximally extended to its top dead center position thereof.

Abstract: The combination of an extension to the shaft of a sabre saw that moves the blade forward of the gear box housing and a guide plate with plates on the end that will abut a transverse plane and channels that will allow the saw to slide forward on the guide plate against a spring bias to cut to the intersection of two planes.

Abstract: An attachment for a hand tool for converting rotary motion to reciprocating motion to an air bathed tool holding chuck.

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: This invention relates to a bust removing device for a portable power saw and in particular to one mainly including a motor, a pinion mounted on the spindle of the motor, a gear meshed with the pinion and provided with an eccentric rod thereon, a yoke connected with the eccentric rod of the gear, a compressible air chamber connected at one end with the yoke, and a pipe having an end connected with an outlet of the air chamber and having the other end disposed behind the saw blade, whereby when the motor is turned on, the spindle thereof will drive the pinion which in turn will drive the gear thereby causing the eccentric rod to rotate about an axle of the gear and therefore, pulling the yoke to move backwards and forwards to compress the air chamber to exhaust air to remove the sew bust accumulated in front of the saw blade.

Abstract: A keyless saw blade chuck has a generally cylindrical collar receiving the blade attachment end of a tool shaft, a clamping member and a mounting portion of a saw blade. The clamping member is located within the collar and urges a received saw blade against the tool shaft. A bore extends transversely through the collar and supports a slideable lock pin for holding the collar and the saw blade on the tool shaft.

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: The reciprocating plunger of a power tool has a planar surface for substantial co-extensive engagement with one side of the mounting portion of plural ones of blades of varying thicknesses. A housing mounted to the plunger includes a cavity and rotatably supports a cam block in the cavity. The cam block has an arcuate cam face establishing respective plural axial lines of contact with the other side of the mounting portion of ones of the blades of varying thicknesses. Each of the lines of contact occupies an over-center relationship with respect to a plane perpendicular to the blade and containing the axis of rotation of the cam block.

Abstract: A hack-saw that consists of a powered motor encased in a housing unit with a handle for gripping by the operator. Extending out from the top of the handle is an elongated bar which runs out forward from the motor housing unit to which depends a leg parallelly disposed relative to the motor housing. Extending out from the bottom of this leg is a rod, spring and nut assembly parallel in line to the elongated bar. One end of the metal hack-saw blade is removably attached to the rod, spring and bolt assembly and the other end of the blade is removably attached to the reciprocating output member of the motor extending out from the bottom of the motor housing which when running moves back and forth, causing a sawing motion. In another embodiment the rod, spring and nut assembly includes an anti-rotational structure to assure the hack-saw blade reciprocates over a constant path of travel to avoid misalignment.

Abstract: A saw blade retention system for retaining a saw blade to a reciprocating saw includes a shaft connected to the saw for reciprocation and having a slot for receiving the saw blade. The saw blade retention system also includes a chuck disposed about the shaft and having a slot aligned with the slot in the shaft in an unlocked position for allowing the saw blade to be disposed in the slot for the shaft. The saw blade retention system further includes a cam-type mechanism for allowing the chuck to rotate angularly relative to the saw blade and shaft to a locked position to prevent the saw blade from exiting the slots and for allowing the chuck to move axially relative to the shaft to prevent axial movement of the saw blade between the chuck and the shaft. Complementary inclined surfaces are provided on the blade and the chuck to center the blade relative to its intended path of reciprocation.

Abstract: Method and apparatus for removing windshields, particularly laminated windshields, from motor vehicles during emergency rescue operations comprise an apparatus with a blade, a blade driver for reciprocating the blade, and a portable power source for the blade driver. The blade driver is selectively operated to reciprocate the blade, which breaks and pulverizes the glass and breaks the plastic lamination of the windshield along a predetermined path to circumscribe a portion of the windshield that is to be removed.

Abstract: The adjustable guide shoe is mounted on a support bar which is received within an elongated slot formed in the nose section of the power saw. The support bar is provided with plural sets of opposed cam faces which are provided in side-by-side pairs spaced longitudinally of the bar. A manually operated plunger is mounted in the nose section and is spring biased toward the support bar. The plunger bar includes cam surfaces adapted for complimentary wedging engagement with selected sets of cam faces on the support bar to achieve a self-locating function for the support and guide shoe mounted thereon.

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: An electric hand saw has a stationary sword having a lower side, a reciprocatable saw blade received in the lower side of the sword and having a rear end portion, a machine housing having a transmission outlet in which the rear end portion of the saw blade is received. The machine housing has a longitudinal slot located under the rear end portion of the saw blade. A suction passage is mounted on the lower side of the machine housing and has a sucking-in opening extending from the front end side of the suction passage to the longitudinal slot of the machine housing located under the rear end portion of the saw blade.

Abstract: A mechanized coping saw has a frame and handle attached thereto, the frame including a U-shaped portion with opposite leg sections having outward ends, a cavity formed within the U-shaped portion, and apertures proximate the outward ends of the leg sections which open into the cavity. An endless blade travels through the cavity of the U-shaped portion around rotating elements with a portion of the blade extending straight between the leg sections to define an exposed blade cutting section, A power drive system drives the blade through the cavity. The invention uses a pair of guide rollers which are placed along the profiled edge of a molding piece to steadily guide the blade cutting section for precise coping of the molding piece. The rollers are adjustable to provide for a variety of different cutting angles and situations.

Abstract: A power saw has a sword having side walls which form a groove-shaped guide, and two parallel oppositely reciprocable saw blades having one longitudinal side provided with saw teeth and another longitudinal side provided with backs which are guided in the groove-shaped guide. The groove-shaped guide is interrupted by a plurality of recesses.

Abstract: A saw blade retention system for retaining a saw blade to a reciprocating saw includes a shaft connected to the saw for reciprocation and having a slot for receiving the saw blade. The saw blade retention system also includes a chuck disposed about the shaft and having a slot aligned with the slot in the shaft in an unlocked position for allowing the saw blade to be disposed in the slot for the shaft. The saw blade retention system further includes a cam-type mechanism for allowing the chuck to rotate angularly relative to the saw blade and shaft to a locked position to prevent the saw blade from exiting the slots and for allowing the chuck to move axially relative to the shaft to prevent axial movement of the saw blade between the chuck and the shaft. Complementary inclined surfaces are provided on the blade and the chuck to center the blade relative to its intended path of reciprocation.

Abstract: A tool holder, particularly for longitudinally extending saw blade having a flat shaft, the tool holder has two walls defining a slot therebetween for insertion of a tool, a dowel arranged in one of the walls perpendicularly to the slot and engageable in a passage of a tool shaft and a spring-loaded clamping member to press the tool against one of the walls.

Abstract: The invention relates to a device for mounting a saw-blade provided with an opening to a carrier which is connected to a drive device to make a reciprocating movement, wherein the device comprises: a wall extending in the direction of movement which is suitable for contact with a side of the saw-blade; a mounting body which is rotatable opposite the wall around a shaft extending perpendicularly of the direction of movement and parallel to the wall and which is provided with a protrusion which is movable into the opening arranged in the saw-blade; and urging means for urging the mounting body to a mounting position wherein the protrusion extends into the opening arranged in the saw-blade. Mounting takes place because via the sphere the saw-blade generates a moment in clockwise direction relative to the shaft. This moment is counteracted by a moment that is generated by the friction between the actuating rod and the contact surface.

Abstract: A hack saw attachment for converting a power driven saber saw or other reciprocable tool to a power driven hack saw includes a plate having a hack saw frame fixed perpendicular thereto. The sole plate of a saber saw is provided with openings for releasable connectors whereby the plate of the attachment is easily connected to the saber saw sole plate. The hack saw frame carries guides at its inner and outer ends, the inner end of the blade passes through the inner guide for attachment to the saber saw arbor. The outer guide carries a second arbor for the outer end of the blade and a spring acts on the outer arbor to ensure proper tension of the hack saw blade during cutting. The hack saw frame carries a handle to facilitate manual reciprocation of the hack saw as it is also reciprocated by the saber saw drive to ensure even wear of the hack saw teeth along the length of the blade.

Abstract: The motor drives the crown gear which has an upwardly projecting eccentric drive pin which drivingly engages the channel fixed on the spindle which reciprocates in the fixed tube and supports a saw blade. The induced vibration is counterbalanced by the reciprocating counterbalance which slides on the outside of the tube. The crown gear has a cylindrical drive member which engages the cylindrical hole in the transfer block. The transfer block is moved in an orbital path and the opposed parallel sides engage and reciprocate the counterweight. The crown gear and cylindrical drive member have material removed to counterbalance the two drives.