Abstract: A clamping device (3) for the saw blade (4) of a hand-operated compass sawing machine has a centering sleeve (7) for the clamped end (5) of the saw blade (4) and a clamping sleeve (10) rotatably mounted on the centering sleeve (7). During the rotation of the clamping sleeve (10) by means of a torsion spring (11), the clamping sleeve (10) is brought, via inclined planes, into the clamping position for the saw blade (4). To improve handling, and especially to make the adjusting member (27, 20) independent of the sawing stroke, a connection bush (27) with a gripping member (28), which connection bush is mounted axially nondisplaceably in the housing (1), is provided as an adjusting member.

Abstract: This device consists of an encased, electrically powered motor housing unit with a first handle parallel in line to the height of the unit. Extending out from the top of the handle is a metal bar one inch in diameter which runs out forward from the motor housing unit to which is attached a second handle bar parallel in line to the first handle and the motor housing. Extending out from the bottom of this second handle is a metal rod with a spring and a bolt parallel in line to the metal bar. This metal rod has a hole in it for mounting one end of a metal hack-saw blade. The other end of the blade is to be mounted to a metal piece extending out from the bottom of the motor housing which when running moves back and forth, causing a sawing motion. Directly above the metal rod with a spring and directly above the metal piece is a metal bar to which is attached a roller to keep the hack-saw blade steady.

Abstract: A method and apparatus for practicing the method by which a reciprocating saw may be utilized to cut within the edges of a panel of material without the necessity of providing a pilot hole or the like for the saw blade, wherein the saw blade is configured in such manner as to taper at the end not attached to the saw motor in order to come to a point and wherein a knife edge is supplied along the edges of said tapered portion of said saw blade, wherein the saw blade at its pointed and tapered end is allowed to cut through the panel of material being sawed with the sawing action commencing immediately after full penetration of the blade through the material.

Abstract: A scroll saw blade holder having a blade support mounted on at least one scroll saw arm. A blade holder frame is pivotally attached to the support and is formed in a generally V-shape for receiving a complementary V-shaped wedge. A first space between a first side of the wedge and the holder allows for the insertion of a scroll saw blade in line with the scroll saw arm and a second space between the wedge and a second side of the holder allows for the insertion of a blade at a 90.degree. angle to the scroll saw arm. A thumb screw inserted through a hole in the wedge and engaging a threaded hole in the holder urges the wedge into the holder, thereby pinching the blade in either of the aforementioned useful positions.

Abstract: A balanced essentially vibration-free hand-grippable fluid powered reciprocating blade cutting tool intended primarily for cutting poultry, fish and meat for processing. The tool includes a hollow handle which functions as a motor housing. Fittings are provided for connecting the housing to a source of fluid under pressure and for exhausting fluid from the housing. A reciprocable cutting blade extends forwardly from the handle. A fluid actuated motor within the handle housing includes a pair of aligned piston assemblies of approximately equal weight. The pistons are reciprocable in opposite directions. The cutting blade is secured to one of these pistons. A control valve and fluid flow passages within the housing and associated with the fluid inlet fitting permits fluid to be directed alternately to the inner and outer sides of the pistons for causing the pistons to alternately move toward one another and away from one another. A manually operable trigger controls the flow of fluid into the housing.

Abstract: A drive gear is mounted for rotation in a plane parallel with the axis of rotation of the output member of the motor. The gear includes an annular series of beveled gear teeth in meshing engagement with beveled pinion teeth on the end of the motor output member. The drive gear includes a crank pin roller and an annular cam surface eccentric to the axis of rotation of the gear. The roller is received within a rectilinear slot in the plunger assembly thereby defining a scotch-yoke drive for reciprocating the plunger assembly. The plunger assembly includes planar cam follower formations engaged by the annular cam surface to provide an oscillating component of movement to the plunger assembly. The crank pin mounts a disk in eccentric relationship to the drive gear; this disk supports another crank pin and roller.

Abstract: A saw member is arranged to receive a manifold housing in securement about a saw member housing, with the manifold including a directional conduit directed into the manifold oriented at a cutting line to remove sawdust from the cutting line for enhanced visibility during a cutting procedure utilizing the saw member. The manifold housing is arranged with apertures in confronting relationship to vent openings of the saw member, or may optionally include in addition to the apertures a blower motor assembly in the absence of vent apertures of the saw member to direct pressurized air through the directional conduit.

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: A reciprocating saw-blade device includes: a case; a main spindle rotatably supported by the case; bearings respectively arranged in front and rear end sections of the case; upper and lower saw blades protruding forward beyond the case and supported by the bearings in such a manner as to be slidable in the longitudinal direction thereof; eccentric cams formed on the main spindle such as to be axially spaced away from and 180.degree. out-of-phase with respect to each other; connecting rods respectively having big end portions pivotably connected with the eccentric cams and small end portions extending along the saw blades toward the rear end section of the case, where they are pivotably connected with the saw blades; and laterally-curved portions formed on the blades and extending in the longitudinal direction on one side of a middle section of the main spindle.

Abstract: A scroll saw having a blade includes a body, a piston connected to the blade as to be moved upwardly and downwardly, and a motor for driving the piston upwardly and downwardly. A hung member is removably secured to the sawing blade. A pulled-down member is removably secured to the other end of the blade. A hanger is engaged with the hung member, and an arm secured to the body is configured so as not to interfere with the workpiece. A pulling-down member is engaged with the pulled-down member, and a suspension unit including a spring is attached to the arm and adapted to tension the blade by the elastic restoring force of the spring as the piston moves. The scroll saw machine is appropriately used as a fixed-installation type or a hand-held type saw.

Abstract: The ram of the reciprocating saw is driven by a scotch yoke mechanism. A planetary gear system consisting of a ring gear and an idler gear imparts an elliptical or linear path of movement to the pin forming part of the scotch yoke mechanism. The ring gear may be adjustably positioned for changing its relationship relative to the idler gear thereby varying the orientation of the elliptical or linear path of movement of the drive pin for varying the stroke of reciprocation of the ram which is connected to the saw blade holder. Actuation of the ring gear to its desired position automatically causes the foot plate of the saw to be located in its desired position for the selected stroke of movement.

Abstract: In the first embodiment, the distal end of a reciprocating plunger of a power saw includes a longitudinally extending cavity receiving a block-like wedge member. A planar wall of the cavity and a planar face of the wedge member are arranged for substantial coextensive engagement with respective opposed faces of the saw blade. A spring in the cavity engages the wedge member for urging the same outwardly of the cavity. A pin extends through the wedge and has its opposite ends received in slots in opposed walls of the plunger. These slots are inclined with respect to the longitudinal axis of the plunger and cooperate with the pin to form a cam to urge the planar surfaces into clamping engagement with the blade under the influence of the spring. The blade may be released by forcing the wedge inwardly of the cavity under finger pressure. In a second embodiment, a similar block-like wedge member cooperates with a U-shaped member mounted on the plunger.

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 hedge trimming tool having a fixed elongated blade mounted to the power head of the tool and a cutting blade mounted over the fixed blade and reciprocating relative to the fixed blade in the direction of the lengthwise axis. A leading side of the fixed blade has projecting fingers or teeth and the overlying portion of the cutting blade has projecting teeth that reciprocate across the openings between the fingers. The reciprocating teeth have sides configured in a complex curve forming an hour glass planar profile and an inverted U-shaped cross section. The U-shaped cross section is provided by curving the sides of the teeth downwardly whereby the teeth sides are angularly projected through the plane defined by the bottom surface of the blade. The cutting edges along the sides are formed by grinding faces through the portions of the teeth projected below the bottom surface of the blade. The faces are formed in a single pass of the grinding implement with the faces parallel to the bottom surface of the blade.

Abstract: In the compact transmission of a hand-held reciprocating power saw, conversion of rotary to reciprocating motion is through a speed reducing bevel gear set (crown wheel and pinion) closely coupled by an eccentric drive pin in the crown wheel to a reciprocating saw blade carrier bar. A guide or bearing plate extending between the crown wheel and the saw blade carrier bar does double duty, guiding and supporting the saw blade carrier bar on one side and, on its opposite side, providing a thrust surface for the crown wheel. The crown wheel engages the guide plate through a thrust ring about equal in diameter to the diameter of the crown wheel. In this way, the shallow crown wheel may be positioned, supported and stabilized entirely by two simple bearings--a large diameter plain thrust bearing of essentially no radial capacity and a short radial bearing subject to virtually no bending or thrust loads.

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.

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: An improved scroll saw blade holder includes a one-piece body having a base and a pair of arms which extend transversely from the base and define an open area therebetween. A slot is provided in the base extending entirely through the base into the open area and extending only partially through the base in a direction generally perpendicular to a plane of the body so that the body remains integral in the base at the slot. A clip is provided on the body and includes a positioning plate which is received in the slot. The positioning plate is located adjoining a set screw in a threaded bore extending from the slot to one side of the body. A portion of a scroll saw blade is received and clamped in the slot between the positioning plate and a side of the slot opposite the threaded bore with the set screw. Scroll saw blades with or without mounting pins may be accommodated.

Abstract: The reciprocating saw incorporates a counterbalanced reciprocating drive having a jackshaft on which primary and secondary wobble plates are mounted. The wobble plates drive a reciprocating saw spindle and a concentric counterweight in opposite directions to cancel out the induced vibrations. The spindle reciprocates in a bearing sleeve having a slot through which the primary wobble arm projects to drive the spindle. The primary wobble arm projects through a longitudinal slot in the spindle and engages the opposite side of the spindle so the spindle cannot rotate as it reciprocates. The counterweight slides on the outside of the sleeve and has a slot which slides over the primary arm. The secondary arm drives the counterweight. The arms are out of alignment to permit their strokes to overlap without collision. The wobble plates are angled out of 180.degree. so the spindle and counterbalance reverse at the same time. The cutting stroke and speed are increased and vibration is insignificant.

Abstract: There is disclosed a tracing light for a saber saw in which the light source is located on the shoe of the saber saw, immediately adjacent the cut line marked on the work piece. In one embodiment, the light source is the terminal end of a fiber optic transmission tube which communicates with a light source mounted at another location on the saber saw. In an alternative embodiment, the light source is within a housing that is secured or supported directly on the shoe of the saber saw, with the light emitting element, either an incandescent bulb or a light emitting diode, located immediately adjacent the cut line of the work piece.

Abstract: A hand-held scroll saw having a blade includes a body having a handle provided at the upper portion of the body, a foot plate provided at the lower portion of the body so as to be slid on a workpiece which is to be cut by the saw, a piston provided over the front portion of the plate so as to be moved upwardly and downwardly, and a motor provided between the handle and the plate so as to move the piston up and down. A hung member is removably secured to the sawing blade at the upper end thereof, and a hanger is secured to the piston at the lower end thereof and engaged with the hung member. A U-shaped arm having an upper portion secured to the body and a lower portion located near the lower end of the blade so that the arm does not interfere with the workpiece. A pulled-down member is removably secured to the blade at the lower end thereof, and a pulling-down member is engaged with the pulled-down member.

Abstract: A power saw has two oppositely reciprocating saw blades guided and supported in a receiving slot in a support plate. The blades are supported during sawing along shoulders on their outside by lower edges of support sections of the support plate. The arrangement is such that forces generated in operation during cutting press the saw blades together in the area of their teeth. This prevents saw dust, chippings etc. penetrating between the two saw blades. Preferably, the thickness of the saw blade shoulders are not greater than half the thickness of the saw blades, and preferably no greater than the thickness of the support section edges. The teeth of the saw blades may be so ground and arranged that the resultant force on the teeth during cutting also forces the saw blades together at their teeth.

Abstract: A cordless, electric handsaw. A U-shaped frame is removably mounted to the saw main frame to support the outer end of a coping saw blade having an inner end removably mounted to a reciprocably driven linkage connected to a battery operated motor contained in the handle. A keyhole saw blade is mountable to the reciprocably driven cylinder once the coping saw blade is removed.

Abstract: The reciprocating saw incorporates a counterbalanced reciprocating drive having a jackshaft on which primary and secondary wobble plates are mounted. The wobble plates drive reciprocating saw spindle and a concentric counterweight in opposite directions to cancel out the induced vibrations. The spindle reciprocates in a bearing sleeve having a slot through which the primary wobble arm projects to drive the spindle. The counterweight slides on the outside of the sleeve and has a slot which slides over the primary arm. The secondary arm drives the counterweight. The arms are out of alignment to permit their strokes to overlap without collision. The wobble plates are angled out of 180.degree. so the spindle and counterbalance reverse at the same time. The cutting stroke and speed are increased and vibration is insignificant. The drive has many other uses.

Abstract: A compass saw comprising a separate removable suction channel located between a base plate and a saw housing pivotally supported on the base plate, the suction channel having a substantially unobstructed suction path.

Abstract: The power saw is provided with a shoe pivotally mounted on a post which is mounted in a cavity of the nose section of the gear case of the saw. The post has a multiplicity of grooves separated by lands which are flat between the grooves. A lock pin is mounted in the nose section transverse and spaced from the post. When the pin is in its normal locking position, the round exterior of the pin engages one of the grooves on the post to retain the post and shoe in position relative to the saw. The lock pin has a flat section which is parallel to and spaced from the flats on the post when the pin is rotated to the release position freeing the post and shoe for movement to adjust the position relative to the saw. A lever is mounted on the end of the pin which projects through the side of the gear case. The inside of the lever has a dimple which engages the soft boot covering the gear case.

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: A hedge trimmer includes a blade unit having a plurality of teeth spaced at one spacing from each other and another plurality of teeth spaced at another spacing and distance from the first teeth whereby branches and the like having a variety of sizes can be accommodated by the hedge trimmer.

Abstract: An extendible tree trimmer includes an extendible tube unit with a motor and a cutting blade connected to the opposite ends. The tube unit includes a first housing and a telescopic second housing connected by a releasable coupling unit. A first shaft connected to the motor extends through the first housing and second shaft is telescoped with the first shaft and extends through the second housing to the cutting blade. The housings are releasably coupled for telescoped positioning. A rotary bearing supports the shafts in the housings. A gear reduction unit and a slip clutch unit connects the motor to the first shaft. The cutter head includes a rotating cam secured to the second shaft. The cam has a peripheral groove with axially offset portions and with a follower in said groove. The follower is secured to the blade which reciprocates in the plane of the blade. The blade has teeth on the opposed edges to cut with the blade moving toward the housing.

Abstract: A sawing apparatus includes a guide and a pair of oppositely reciprocable saw blades mounted in a groove of the guide. Mounting portions of the saw blades disposed within the groove slidingly engage one another within an interface plane. Each saw blade includes a cutting portion disposed outside of the groove and carrying outwardly set teeth and inwardly set teeth. The inwardly set teeth extend toward and beyond the interface plane. Feed forces can be applied from the guide to the saw blades by inclined end edges of plates which form the guide. The end edges are inclined obliquely so as to face away from the interface plane and engage correspondingly inclined surfaces of the saw blades. Alternatively, feed forces can be applied to back shoulders of the mounting portions of the saw blades by a member which extends between the guide plates within the groove.

Abstract: A power saw has two oppositely reciprocating saw blades guided and supported in a receiving slot in a support plate. The blades are supported during sawing along shoulders on their outside by lower edges of support sections of the support plate. The arrangement is such that forces generated in operation during cutting press the saw blades together in the area of their teeth. This prevents saw dust, chippings etc. penetrating between the two saw blades. Preferably, the thickness of the saw blade shoulders are not greater than half the thickness of the saw blades, and preferably no greater than the thickness of the support section edges. The teeth of the saw blades may be so ground and arranged that the resultant force on the teeth during cutting also forces the saw blades together at their teeth.

Abstract: A safe means for a cutting mechanism attachable to a remote power source and enclosed within a rigid semi-curved sheath. The sheathed cutting means of the invention is provided with a flexible power transmission means for connection to a remote power source. The flexible power transmission means is comprised of a two-ended blade, one end of which is connected to the power source and the other end of which is capable of acquiring a sharp edge. By means of the rigid slightly curved protective sheath, the blade can be introduced past the dash moldings and garnishings in a vehicle from the inside of the vehicle next to the interior window or windshield so that the cutting blade alone is brought into contact with the polyurethane seal and the seal is quickly and safely severed without breaking the windshield.

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 cordless, electric handsaw. A U-shaped frame is removably mounted to the saw main frame to support the outer end of a coping saw blade having an inner end removably mounted to a reciprocably driven linkage connected to a battery operated motor contained in the handle. A keyhole saw blade is mountable to the reciprocably driven cylinder once the coping saw blade is removed.

Abstract: Sawblades for cutting materials containing abrasive grains or fibers with a power saw utilizing two reciprocating sawblades in contact with each other guided by a groove in a guidebar, all teeth on one blade pointing forwards and all teeth on the other blade pointing backwards. The teeth are located with unequal distances chosen so that two teeth on the first blade will not simultaneously be opposite two teeth on the other blade with the same distance as the teeth on the first blade.

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: A jig or sabre saw has a horizontal foot to be placed on the work to be sawn. A drive unit is pivotally mounted on the foot and drives the tool in a tool holder. The two sides of the saw or other tool are supported by a guide device at points directly above the foot. The guide device is adapted to pivot with the drive unit so support the saw blade even when performing bevel cuts. The guide device and the drive unit may be arranged to pivot about two axes or about a single axis in relation to the foot.

Abstract: A scroll saw blade clamp and blade alignment tool to facilitate blade changes while assuring proper positioning and alignment of the blade. The blade clamp is for the upper end of the blade and includes a pair of clamp bars, one of which is pivoted to the upper saw arm. A locking screw clamps the bars together for clamping of the blade, and a strategically located pin prevents relative rotation of the clamp bars and also serves as a blade guide to properly locate the blade while it is being clamped in place. The alignment device takes the form of a flat bar provided with a recess for holding the lower blade clamp. A groove in the bar is centered on the recess to properly align a saw blade received in the groove.

Abstract: The invention concerns a process and apparatus for cutting hard objects or materials without cutting softer objects or materials.In the invention, a transmission imparts to the cutting element a relatively slow periodic motion that is combined with a second, more rapid periodic motion consisting of relatively low-amplitude vibrations, with the second motion being imparted by oscillation. The invention may be applied to jigsaws and circular saws.

Abstract: This invention comprises a focused light attachment for use with a portable power-driven hand saw, particularly a saber saw. The invention comprises a light source such as an electric lamp with a suitable electrical power source and a focusing mechanism for projecting a very narrow beam of light. The light source and focusing mechanism is mounted on the front of the hand saw and is positioned to project its narrow light beam a substantial distance in front of the saw blade so that it can be used to trace or follow a previously scribed saw line. The tracing light can be used in combination with a flood light that is mounted also on the front of the saw housing and positioned to flood the area surrounding the saw blade with illumination. Most preferably, the tracing light and its focusing mechanism are mounted permanently within the housing of a saber saw.

Abstract: A power driven reciprocating blade hedge trimmer includes a speed-reducing gear train with a sun gear, a plurality of planet gears, and a surrounding hollow drum-like orbiting gear element that seals in gear train lubricant and is formed to have an outer peripheral sinuous groove serving as a cam. A pin-engaging, guided, reciprocating cutting blade element of the hedge trimmer is driven by engagement of the pin and the groove shaped cam to produce reciprocating cutting motion aligned with the axis of the rotating power source. Resilient damping elements are affixed to an end of a blade supporting element where it is held by the hand-held portion of the device, to attenuate and isolate undesirable vibrational feedback generated during reciprocation of the cutting blade element.

Abstract: A microsurgery saw comprising drive means for producing rotary motion, rotary-to-lateral converting means operatively driven by the drive means, saw support means for pivotally supporting a microsurgery saw operatively connected to the converting means for transmitting lateral drive motion to the microsurgery saw, drive casing means surrounding and positioning the drive means and saw support casing means surrounding and positioning the saw support means is disclosed.

Abstract: A saw blade, for a power saw having two such blades arranged adjacent and parallel to each other and reciprocating in opposite directions, comprises an elongate blade member having teeth along a bottom edge. The teeth comprise at least three types, a first type being at an outer surface of the blade member, a third type being at the inner surface, and the second type being therebetween. The first type are shaped to produce on the blade's bottom edge an outward force away from the inner surface while cutting a workpiece, and the second and third types are shaped to produce on the blade's bottom edge an inward force, the resultant force on the teeth while cutting urging the teeth in an inward direction away from the outer surface towards the inner surface. When the power saw is operating with a pair of these blades, the blades are urged together at their teeth by the cutting action so effectively eliminating penetration of sawdust and cuttings between the pair of blades.

Abstract: A hand-held power cutting tool has a generally cylindrical casing, which can be grasped in the palm of one hand, and whose rear portion housed an electric driving motor disposed in the casing with its axis of rotation lying along the longitudinal axis of the rear portion. Reciprocated by the motor via a drive transmission system is a cutter carrier mounted for reciprocatory movement in a bearing support structure. The cutter carrier carries a clamp by which a cutter is attached to the carrier. The carrier is reciprocated at a rate of between 4,000 and 12,000 movements per minute and with a stroke of from 4 to 12 mm for rapid cutting of thin material. The cutter may have a generally U-shaped blade.

Abstract: The saw blade for an electric compass- or keyhole-saw has a saw part with a tooth arrangement and a clamping part with which the saw blade is clamped between two clamping pieces of a clamping device of the compass- or keyhole-saw with a clamping screw to hold parts together in clamped relationship. The clamping part has a centering opening and a plug or insert opening for the tensioning or clamping screw. The plug or insert opening is delimited or bounded by two clamping tongues laterally thereof. The relationship or ratio of the width of the clamping part measured transverse to the longitudinal axis of the saw blade with respect to the length lies in a range of approximately 1:1.4. The relationship or ratio of the length of the plug or insert opening to the width thereof lies in a range between approximately 1:0.7 to approximately 1:1.1. The clamping tongues are constructed respectively having approximately square or rectangular shape.

Abstract: A hand-held, fan-cooled motor drive jig saw with a two-piece, tiltable shoe assembly having a reversible, phenolic resin base portion with a wide recess for scrolling and a narrow recess for straight cuts. The base is connected to the shoe cover independent of the attachment of the cover to the saw housing to maintain a pre-selected tilt angle. Coolant air exhausted from the saw housing is channeled through flow passages in the shoe assembly to outlet ports in the shoe assembly to provide debris-clearing air streams oriented parallel to the workpiece surface and perpendicular to the cutting direction. The housing exhaust port is flow-connected to the shoe assembly through complementary sliding surfaces at the point of attachment.

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.