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 pneumatic tool holder includes: a handle having a piston pneumatically driven within a cylinder in the handle, a sliding sleeve secured to the handle having a longitudinal polygonal hole formed in the sleeve and a tool clamping member generally formed as a polygonal block to be reciprocatively stably guided in the polygonal hole of the sleeve having a pair of set screws transversely inserted through the block to firmly clamp a tool shank as inserted into the block and an air passage provided in the handle and in between the tool clamping member and the sleeve for directing air stream from inside the cylinder to cool down the operating tool as held in the clamping member.

Abstract: Cutting apparatus (15) for cutting-out stacks of sheet material such as fabric has a guide (55) for a reciprocating cutter (16), driven by a drive mechanism (18) arranged in a housing (19). The housing (19) is mounted on a carrier (8) extending above a cutting-out table (2). The cutter (16) is driven from an eccentric (38) arranged on a rotary member (36). A counterweight (41) is driven from a second eccentric (39) with an eccentricity (e) which is oppositely directed to the eccentricity (e) of the first eccentric (38) driving the cutter (16), to compensate for inertial forces generated by the mass of the cutter (16). The cutting apparatus (15) is free of turning moments acting substantially in a plane lying in the axis (36) of therotary member (32), by arranging the eccentrics (38, 39) in a turning plane (E.sub.1) on the two rotary members (32, 33), the members (32, 33) lying one behind the other with respect to the cutting direction (34) of the cutter (16) and rotating at the same speed as each other.

Abstract: A portable compass saw having an oscillation drive for a push rod, to which a saw blade is attached. The push rod has an angular cross-section, and is guided over part of its length on all sides in a housing. Guide surfaces, themselves formed by parts of the housing, are provided for the purpose of guidance on two opposite sides of the push rod. Roller bearings extending at right angles to the stroke direction are respectively located on the two other sides of the push rod. In the region of the oscillation drive, a pressure member acts on the push rod on the opposite side. This member loads the push rod in the direction toward the oscillation drive. The push rod is consequently guided in a trouble free manner in the housing in, and at right angles to, the direction of the stroke, so that no play occurs which may impair the saw cut.

Abstract: A clamp for a reciprocatory tool blade is disclosed having a spring loaded roller constrained in an inclined blade accommodating cavity which so effectively forces the roller into clamping relation against a tool blade shank that no special blade shank configuration is required and manual shift of the roller against the spring load provides for ready removal of the tool blade.

Abstract: For a powered hand tool having a plastic housing and requiring a slide button with a detent action for at least two positions with an audible indication of the transition from one position to another position, a plastic spring molded as part of the housing and having an arched surface extending into the path of a projection from the slide button which has first and second oppositely disposed tapered sides extending towards each other and terminating in a flat base portion which coacts with the arched surface to provide a detent action and an audible indication of the transition to a new position when the slide button impacts upon abutments formed as part of the housing.

Abstract: A reciprocating saw attachment for a chain saw whereby the rotating chain saw drive converts the attachment to reciprocating movement to operate a saw blade longitudinally remote from the chain saw tool. It comprises a guide bar having one end formed to replace the prior art guide bar. The guide bar of this invention is formed with a slotted aperture in the body thereof and carries a sprocket wheel at the distal end of the guide bar. An endless link chain encircles the edge of the guide bar, the sprocket drive of the chain saw motor and the sprocket wheel mounted on the guide bar. A slide block is reciprocally movable in the slotted aperture and driven by a crank lever connecting the sprocket wheel and the slide block. A longitudinal pole is mounted on the guide bar for distally supporting an elongated push rod mounted on the guide bar for reciprocal movement. The proximate end of the elongated push rod is linked to the slide block.

Abstract: The present invention relates to a manual tool device, preferably used for surgical operations on bones, of longitudinal shape and to a method for making the same, the device assembly and arrangement, in particular the gearing section by which the driving force of an electrical motor is operatively transmitted to the tool through a gearing mechanism, and the weight of the device provides a well balanced device that is easy to work with in a highly precise manner. The method to produce the manual device represents a simple and rational way of manufacture.

Abstract: A reciprocating device which is composed of a base and a longitudinally movable member supported above the base on a support including rollers in engagement with the longitudinally extending member for guiding reciprocating movement of the member above the base and a motor connected through its drive shaft and wheels and gears to one end of the member for imparting cyclical or reciprocating movement to it above the base along a predetermined path defined by said rollers.

Abstract: A sabre saw is provided with a generally tubular saw bar journalled for linear movement in a journal bushing secured in the top portion of the housing and rotatable therein with means provided so that they rotate together. The journal bushing is provided with a generally annular collar in turn provided with a plurality of generally radial notches and a cantilever leaf spring is mounted to the housing with its distal end adjacent the collar and shaped for selective engagement within the notches. A slide trigger is slidably carried by the housing at a top portion thereof convenient to the operator's thumb control which when slid towards the saw bar depresses the cantilevered leaf spring against the collar and into a selective one of the notches when they are aligned for locking the saw bar against rotation. Rearward movement of the trigger slide is effective to release the cantilevered leaf spring wherein it will pop up out of the notch and permit free rotation of the saw bar.

Abstract: For a power tool having a reciprocating drive mechanism, an improved one-piece scotch yoke having a curved track design which substantially eliminates the contact pressure between the yoke and guides created in conventional straight track designs by the couple on the reciprocating yoke shaft imposed by the non-collinear blade and crank loads. The radius of curvature of the yoke track is preferably equal to the distance from the shaft bearing to the crank pin at its mid-stroke position where the velocity of the yoke is greatest.

Abstract: A holder for a blade of a saber saw unit, wherein the blade is of the type provided with a pair of opposed side marginal edges and a notch in at least one side marginal edge near the rear end of the blade. The holder includes a support having a slot for receiving the blade and projecting means shiftably mounted on the support near one side margin of the slot for movement across the same and into the notch of the blade when the blade is in the slot to releasably hold the blade in the slot. Bias means holds the projection means in an operative position in the notch of the blade in the slot. A number of embodiments of the holder are disclosed.

Abstract: A reciprocating blade saw wherein the counterbalancing of the drive system includes the provision of two directly opposed and coaxial rams, one attached to the saw blade and the other having a mass equal to the first ram plus the blade, both being attached to a crankshaft by links which have their masses symmetrically distributed. The crankshaft is driven by a hydraulic motor, and all the masses are so matched that the saw is in balance at all speeds and can be operated at high speeds with minimal vibration. The saw is designed for use particularly in the meat industry.

Abstract: A butcher's meat saw has a housing from which extends a flat guide plate having an edge along which is slidable a blade reciprocated by an eccentric-type drive mechanism within the housing. Either the edge of the guide or the edge of the blade is formed with a groove and the other edge fits in this groove. One of these edges is furthermore formed with laterally opened notches so as to facilitate cleaning of the saw.

Abstract: To provide a directional guiding mechanism for saber type and blade control in tools, having a motor, a manipulating handle and a reciprocating shaft in a housing, to which shaft a saw blade, etc., is attached.One concept of the invention is achieved by the use of a unique control mechanism including a rotatable flexible cable by which to rotate the reciprocating saw blade in the cut, in any desired direction, with less movement or turning of the main body of the tool especially in a restricted or cramped area. These operations can be accomplished with the use of but one hand of the operator, leaving the other hand free to hold firm the material to be cut or worked upon.

Abstract: A drive system for a reciprocating blade saw wherein a motor rotates an eccentric which rocks a bell crank to reciprocate the saw blade, the eccentric and the bell crank being associated with masses which rotate and rock 180.degree. out of phase with the eccentric and bell crank and are so proportioned as to counterbalance those elements and minimize the vibration of the system. The counterbalancing masses are divided and mounted each side of the working elements so that no lateral torque forces are developed.

Abstract: A portable, power-operated sabre saw having a power driven saw blade holder which is curved and which is mounted in the sabre saw housing for reciprocation along a curved path that is determined by its curvature to impart to a blade carried thereby a component of cutting stroke travel that is in the direction in which the blade is urged against a workpiece to cut the workpiece. Another feature disclosed herein is a counterweight which dynamically counterbalances the mass of the saw blade holder and the saw blade and which is recessed to receive a power driven gear that supplies the motion for reciprocating the holder and the counterweight. The counterweight is confined between and guided for reciprocating motion by opposed side wall regions of a longitudinally split housing, and a guide pin, which is trapped between the halves of the split housing, extends through a slot in one end of the counterweight to provide a further guide for the counterweight.