Abstract: A jig saw has a pivotally mounted reciprocating saw blade assembly which is reciprocated by a drive shaft. A pendular stroke device generates an additional feed movement of the saw blade. The pendular stroke device comprises a rod like element reciprocating in a direction substantially parallel to the direction of reciprocation of the saw blade, a rotatable drive element driven by the drive shaft, and a pivotally mounted engagement element against which the saw blade assembly is spring biased. The rod like element is coupled to the rotatable drive element and acts to pivot the engagement element to pivot the saw blade assembly. The pivotal axis of the engagement element is displaceable to change the spacing between the engagement element and the rod like element to determine the degree of or eliminate pivoting of the saw blade assembly. Preferably, the engagement element is pivotally mounted on an eccentric formed on a shaft which has a handle for adjustably rotating the shaft.

Abstract: A motor-compressor unit comprising a shell, a compressor, and a motor. The compressor includes a yoke and a slide block to transmit motion from a compressor crankshaft to a plurality of compressor pistons. The yoke includes left and right longitudinally extending side wall portions, and upper and lower front and rear connecting portions secured to and transversely extending between the left and right side wall portions. The upper and lower front connecting portions define a front transverse opening, and the upper and lower rear connecting portions define a rear transverse opening. The slide block is supported by the yoke for longitudinal sliding movement through the front and rear transverse openings.

Abstract: A reciprocating compressor comprises a piston body reciprocally movably disposed within a cylinder housing and having first and second pistons which are coaxially aligned with each other. The first and second pistons define respectively first and second chambers within the cylinder housing. Intake and discharge valves are provided to allow therethrough a fluid to be sucked into and to be discharged out of each cylinder chamber, respectively. Additionally, the compressor is provided with a device for changing the rotary motion of a drive shaft into the reciprocating motion of the piston body. Accordingly, the compressor becomes small-sized and light in weight and is simplified in construction, thereby considerably reducing parts thereof.

Abstract: An apparatus for causing a load support guided on rectilinear rails to move gradually. The apparatus having a rectilinear slot integral with the support to be driven and a crankpin which engages in the slot and forces the slot to move. The slot (54) is elongated perpendicularly to the direction of movement and is open at both its ends and it has two toothed wheels (42, 43) driven in opposite directions, mounted on either side of a neutral central position of the slot and each bearing an excentric crankpin (50, 52) which engages in the slot an drives it while it runs through a half-circumference round the toothed wheel, the other crankpin engaging in the slot and driving it while it runs alone through the other half-circumference.

Abstract: A power operated tool includes a prime mover, an output member and a power transmission mechanism arranged to transmit rotary motion of the prime mover to a reciprocatory output member. The power transmission mechanism includes a first member mounted for reciprocating motion, a link coupled at one end to the first member, and a second member mounted for rotation about an axis transverse to the path of reciprocating motion of the first member. The arrangement is such that rotation of the second member reciprocates the first member and also imparts a cyclic partial rotation to the first member during said reciprocation. The second member has a bore therein spaced from the axis of rotation and inclined there towards. The bore has an axis which intersects the axis of rotation at an angle of about one quarter of the angle through which the first member partially rotates.

Abstract: A press includes a frame, a flywheel, a motor for driving the flywheel, and a shaft. A clutch is provided which is actuable for engaging the shaft to the flywheel. An eccentric is journaled upon the shaft and rotates therewith. The eccentric rotates in a block which is slidably mounted in a head to permit the block to move laterally within the head. The head is vertically movable in response to vertical movements of the block. The press also includes an upper die which is mounted on the head and a lower die which is resiliently supported upwardly on a base. Movement of the head engages and disengages the upper die and lower die.

Abstract: An automatic vegetable buncher for use in combination with a mechanical harvester of leafy green vegetables conveys the greens to a packing station where a pair of packer fingers driven by a novel rectangular motion generator incrementally feeds the greens into one of a plurality of pockets mounted on a rotatable wheel. When a predetermined bunch size is accrued, the wheel rotates to position an empty pocket at the packing station and to advance the vegetable bunch to a device which ties it into a marketable bundle.

Abstract: A sabre saw comprises a saw blade connected at its rear end to an elongated saw blade carrier extending in the longitudinal direction of the blade. The carrier is guided for reciprocating movement in a bushing which is mounted in the housing of the sabre saw for pivotal movement about a pivot axis normal to the longitudinal direction of the carrier. A first bevel gear driven by a second bevel gear on the output of an electric motor is rotated about its axis inclined at an acute angle to the longitudinal direction of the carrier and carrying a pin parallel to and laterally spaced from the inclined axis.

Abstract: A driving mechanism for reciprocating a windshield wiper arm having maximum velocity at the mid-portion of the wiper stroke and zero velocity and minimum acceleration at the outboard ends of the stroke. The driving mechanism includes a slotted follower having a semicircular shape with ends pivotally secured to a housing. An output drive shaft extends from the motor housing and has a curved crank attached thereto for rotation. The crank includes a pin at one end which extends into the follower slot for converting the rotary motion of the output drive shaft into reciprocable motion of the follower. The follower transmits the reciprocable motion to a drive shaft connected to the wiper arm for reciprocating the wiper across the windshield surface.

Abstract: A drive mechanism is disclosed for drivingly connecting two reciprocating bodies to a rotating body and is particularly useful for linking a single pin crank of a crank-type Stirling engine to its displacer and power piston. The drive means has at least two slotted yokes, each connected to a different one of the reciprocating bodies such as the pistons of the Stirling engine. The pin of the crank extends through the slots of both slotted yokes. The slots are transverse to each other and preferably are linear.

Abstract: A linear motion device particularly usable for providing a lateral movement stroke with vertical lifting and dropping performed at the extreme limits of movement of the lateral stroke which includes a base, two vertical shafts fixedly secured to the base and extending upwardly therefrom, a yoke movably secured to the vertical shafts to be vertically movable with respect thereto. The yoke member including a yoke pin extending outwardly therefrom into a lift cam which is circular and rotatably driven by being fixedly secured to a drive shaft, the lift cam achieving selective vertical movement of the yoke member responsive to the profile of the cam therein.

Abstract: A dental contra-angle which supports a tool socket for combined motion consisting of two oscillatory movements simultaneously, one motion being a linear reciprocating motion parallel to the axis of rotation, and the other motion being an oscillatory motion around the axis of rotation. A tool receiving aperture opens through one end of the socket and extends along the axis toward the other end. A tool for treating a root canal, when installed in the socket, will be given a combined motion consisting simultaneously of a linear reciprocating motion in the axis of the root canal, and an angular oscillatory motion around the axis of the root canal. The resulting motion of such a tool is one of dipping with simultaneous partial rotation.

Abstract: An automatic vegetable buncher for use in combination with a mechanical harvester of leafy green vegetables conveys the greens to a packing station where a pair of packer fingers driven by a novel rectangular motion generator incrementally feeds the greens into one of a plurality of pockets mounted on a rotatable wheel. When a predetermined bunch size is accrued, the wheel rotates to position an empty pocket at the packing station and to advance the vegetable bunch to a device which ties it into a marketable bundle.

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 mechanism for translating rotation motion to linear motion utilizing a turret rotatable about a first axis carrying a crank shaft rotatable about a second axis parallel to but offset from the turret axis and carrying a crank arm which in turn carries a drive element having a third axis parallel to but offset from the first and second axes, the drive element contacting and driving a driven element guided for movement along a generally linear path upon the rotation of the turret between first and second generally diametrically opposite positions relative to the arc of rotation of the turret, a pair of cooperative abutment members for absorbing the momentum of a load driven by the driven element, one of the abutment members being carried by the turret and gearing meshingly interconnecting another of the abutment members and the crank shaft, the one abutment member being effective to contact and move the other abutment member upon the driving element moving contiguous the first and second positions, and a sprin

Abstract: A crosshead for a scotch yoke mechanism is formed from a generally rectangular blank of sheet steel provided with a generally oval, straight sided opening extending generally transversely medially thereof and a pair of generally circular openings centered and spaced apart from each of the oval opening straight sides, the blank being formed, as on a four slide forming machine generally around two generally parallel lines each being generally extensions of the oval opening straight sides to provide top and bottom generally parallel panels defining a closed end guide track having parallel sides and positioning the generally circular openings in the top and bottom panels and in line to be threaded on a generally cylindrical tubular saw bar of a sabre saw, the blank being further formed to tubular configuration of generally rectangular cross-section by two further parallel bends closing the crosshead on a fourth side on the side of the saw bar opposite the guide track opening.

Abstract: A keyhole type saw is provided which includes transverse stroke control apparatus for controlling the movement of the saw blade in a direction transverse to the linear stroke path. According to preferred embodiments, the transverse stroke control apparatus includes a rotatable blade guide roll engageable directly with the saw blade, which guide roll is in turn carried at a guide lever arm. A rotary plate is supported in the housing of the saw and includes a pivot connection for a swing arm which has the other end engageable at the guide lever arm by way of cam surfaces, whereby the position of the swing arm directly controls the presenting transverse stroke of the blade guide roll and saw blades.

Abstract: A pump having first and second pumping chambers and a double-acting reciprocating piston which partly defines the pumping chambers. The piston is reciprocated by a rotatable drive member which may include an eccentric. The rotatable drive member has a peripheral surface which engages first and second wear members lying on opposite sides of the drive member. Each of the wear members is mounted on the piston for at least limited movement toward and away from the drive member. First and second resilient elements are positioned between the first wear member and the piston and the second wear member and the piston, respectively. The resilient elements resiliently support the wear members to provide a good driving connection between the drive member and the piston.

Abstract: Apparatus for automatically loading film transparencies into pre-closed slide mounts either of plastic or of cardboard material and having an internal pocket for receiving the film transparency which is inserted through an openable region near one edge of the mount. In loading operation, wedge means temporarily spread the openable portion of the slide mount, defining a passageway for the film transparency to pass through into the mount, and then the two sides of the mount are allowed to spring back to their closed position after loading. Advantageously, the film transparency is cut off from the filmstrip before loading, with the freshly cut end of the strip serving as pushing means for pushing the film transparency into its mount, and thus low inertial forces are involved, because the individual cut transparency has only a small mass to be accelerated and moved. The film strip is bowed into a longitudinally extending arch for providing longitudinal stiffness for pushing the transparency.

Abstract: In a forging machine where the frictional work is reduced in the driving system at the main crankshaft and its support bearings, especially at the moment a forging force is applied. A rotary driven crankshaft is connected to a crank mechanism, which has a connecting rod connected to the driven crankshaft. The opposite end of the connecting rod is pivotally connected to an arm for driving the main crankshaft in an oscillatory rocking motion, which reciprocates the hammer means.

Abstract: The invention is directed to a power driven tool for reciprocating a cutting element such as a saw-blade or the like and includes a motor housing and a drive motor mounted in the motor housing. A gear case is connected to the motor housing and the shaft arrangement is mounted in the gear case. The shaft arrangement includes a shaft slideably mounted in the gear case for reciprocating movement. The shaft is adapted to receive the cutting element thereon. A U-shaped channel yoke is mounted to the drive shaft in such a manner that the walls of the drive shaft laterally support the U-shaped channel yoke at the base of the yoke. An eccentric drive connects the U-shaped channel yoke with the drive motor for reciprocating the shaft arrangement.A method of assembling the shaft arrangement includes the step of cutting two slots in the base of the channel yoke to define three bridges one adjacent the other bridging the gap between the leg walls of the yoke.

Abstract: A multi-cylinder pump for delivering fluids under high pressure which includes a multi-lobed camshaft having bearing supported yoke elements disposed in an oil-filled crankcase for coupling the camshaft to plural piston elements such that displacement of the plural piston elements occur in a desired phase relationship and improved sealing arrangements disposed between the piston and the cylinders, between the suction inlet port and the high pressure outlet port and between the cylinders and the oil-filled crankcase to prevent cross-contamination of the oil lubricant and the fluid being pumped and to prevent any substantial leakage between the high pressure outlet port and low pressure inlet port during the suction and pressure strokes of the pistons.

Abstract: The invention is directed to a power operated jig-saw which includes a housing and an elongated saw-blade holder for holding a saw-blade. A first bearing pivotally mounts the elongated saw-blade holder in the housing. A drive imparts a reciprocating up and down movement to the elongated saw-blade holder. A cam arrangement imparts a reciprocating movement to the elongated saw-blade holder and includes a body rotatably mounted in the housing and operatively connected to the drive. The rotating body has formed thereon a continuous cam surface extending about the axis of rotation thereof. The cam arrangement also includes a carrier and a resilient member. The carrier is mounted in the housing so as to be reciprocally movable in a direction transverse to the elongated saw-blade holder and carries a bearing for slideably holding the saw-blade holder.

Abstract: A cyclic motion generator comprising a mechanism capable of providing from a constant speed input a cyclic motion output, either linear or rotary depending on the application, which can be sinusoidal. The new mechanism has the further capability of being conveniently manually infinitely adjustable in amplitude from zero to maximum without requiring stoppage or disconnection of the input or the output.

Abstract: An improved scotch yoke has a means for absorbing sideward thrust. It includes a rod extending in a first direction through a hole in the yoke housing. A yoke arm in the housing is pivotable about an axis and extends in a second direction that intersects the first direction. Projection means, preferably on a member on the rod, extend through a slot in the yoke arm to link the rod with a means for absorbing sideward thrust to minimize bowing and twisting in the yoke arm and the rod. Movement of the rod slides the member in the first direction and pivots the yoke arm about the axis.

Abstract: A compressor utilizing opposing cylinders and flap valves in which the configuration may be readily modified from compressor to vacuum operation by simple reversal of components. Convertibility is facilitated by a valve plate having apertures which connect opposed cylinders and a manifold channel to opposed end chambers. Reversible flap valves are mounted on the valve plates and on the pistons. Additionally, a Scotch-yoke type mechanism of novel construction is provided in which the slider is formed of porous bronze and in which lubricant-containing wick material is disposed in the slider normal to and within the crankpin bearing hole.

Abstract: An improved scotch yoke has a means for absorbing sideward thrust. It includes a rod extending in a first direction through a hole in the yoke housing. A yoke arm in the housing is pivotable about an axis and extends in a second direction that intersects the first direction. Projection means, preferably on a member on the rod, extend through a slot in the yoke arm to link the rod with a means for absorbing sideward thrust to minimize bowing and twisting in the yoke arm and the rod. Movement of the rod slides the member in the first direction and pivots the yoke arm about the axis.

Abstract: This invention is drawn to reciprocating power tools. It is often desirable in reciprocating power tools to be able to adjust the length of the stroke of the tool member. The invention disclosed herein comprises an inexpensive device for performing this function. In effect, a screw adjustment member having a hand knob is mounted in the tool housing and when rotated changes the position of one end of a simple lever. The other end of the lever bears against a rotating member which is mounted on the power output shaft of the tool. As this movable rotating member is adjusted, it causes a second simple lever to rotate, changing the position of the arm of the reciprocating mechanism with respect to the shaft of the power drive means. Thus, as the knob on the screw adjustment member is rotated, the swing arm length of the eccentric driven by the power source may be varied.

Abstract: A hand-held portable electrical skin treatment appliance and particularly for use in the care of facial skin wherein the appliance is provided with means for detachably mounting various skin treatment devices to a rotary drive output. The attachment device is provided with self-contained motion translating means for converting the rotary drive output orbital movement of the skin treatment device to enhance the massaging or cleansing effects to the skin of the user.

Abstract: A hedge trimmer having two counter reciprocating cutting blades, each of the blades having a yoke at one end defining a cam follower slot, the cutting blades being held together by mounting means which hold the yokes in close face-to-face contact, and a double cam drive engageable with the cam follower slots, the double cam drive being so designed that one cam cannot interfere with the cam follower slot which is adapted to be engaged by the other cam. The cams are so positioned with respect to each other that the periphery of one cam entirely surrounds the periphery of the other cam. The cams, which are circular, are mounted upon one side of a drive member with the axes of the two cams lying on opposite sides of the axis of the drive member.

Abstract: Vibration dampening and heat sink mechanism for a reciprocating hand-held saw has a carrier guide with limited axial and radial movement positively controlled by an eccentric. The carrier guide serves both as a counterweight and a heat sink. A drive shaft for an eccentric to provide such limited axial and radial movement also drives a wobble mechanism for reciprocating a saw blade carrier slidably mounted in the carrier guide. The center of gravity of the carrier guide travels in an elliptical path. The relative movement of the carrier guide with respect to the saw blade carrier and their relative weights are such that a substantial or near perfect balance may be obtained when aggressive orbital action of the saw blade and saw blade carrier is used as in the case of cutting wood. The location and mass of the carrier guide effects a heat sink for the heat generated by friction due to relative reciprocating motion of the slidably mounted saw blade carrier.

Abstract: The striker is mounted in a barrel for axial reciprocal movement thereby to impart successive hammer blows to the end of a tool shank element extending into one end of said barrel. An actuator is connected to the piston by lost-motion means. A motor driven, mechanical crank assembly is connected to the actuator for reciprocating the piston such that its velocity in the hammer-direction is greater than its velocity in the return-direction.