Abstract: Reciprocating engines and methods of their operation of. Pistons of such an engine are interconnected through a pinion gear and dual gear rack of a reciprocating assembly in a manner capable of reducing the loss of torque at the top-dead-center (TDC) positions of the pistons.

Abstract: There is presented various embodiments disclosed in this application, including an improved crankshaft system using a load connecting member which provides a greater maximum torque angle than a conventional system, thereby improving efficiency and power.

Abstract: The subject matter of this specification can be embodied in, among other things, a linear-to-rotary apparatus that includes a linear actuator having an actuator housing including a piston chamber, a piston shaft disposed in the piston chamber, and a rotor apparatus. The rotor apparatus includes a rotary joint defining a rotational axis, a rotor arm extending radially from the rotary joint and configured to at least partially pivot about the rotary joint, and a torque linkage pivotably connected to the rotor arm. The torque linkage is also attached to an end of the piston shaft of the piston at a pivot connection joint, where the pivot connection joint defines a pivot axis that is substantially perpendicular to the translation axis of the piston shaft.

Abstract: There is presented various embodiments disclosed in this application, including an improved crankshaft system using a load connecting member which provides a greater maximum torque angle than a conventional system, thereby improving efficiency and power.

Abstract: An elevator car has an access opening, a car door for closing the access opening, which door has at least one door panel that can be displaced parallel to the access opening, a thrust crank drive for displacing the at least one door panel between an open position and a closed position, an electric motor for driving the thrust crank drive, and a control device for actuating the electric motor. The control device actuates the electric motor so that a displacement velocity of the at least one door panel is substantially constant over the entire displacement path between the open position and the closed position of the door panel.

Abstract: A side-viewing endoscope includes an elongated tube for entry in a body cavity for imaging. A wire line is contained in the elongated tube, for moving in an axial direction back and forth. A guide device is coupled with a distal end of the wire line, caused to shift between first and second positions by the wire line, for orientation in a direction crosswise to the axial direction upon being set in the second position. An input lever is disposed at a proximal end of the wire line, for moving the wire line in the axial direction. A cam mechanism is connected between the input lever and the wire line, for shifting the guide device at a first shift between the first position and an intermediate position, and shifting the guide device at a second shift smaller than the first shift between the intermediate and second positions.

Abstract: A crank-type non-beam pumping unit, including a belt, a foundation, a crown sheave, a frame, a support rod, a belt pulley, a pin shaft, a crank, a transmission shaft, and a bracket. The bottom of the frame is disposed on the foundation, and the top of the frame is supported by the support rod. The top of the support rod is hinge connected to the frame, and the bottom of the support rod is hinge connected to the foundation. The bracket is disposed on the foundation, the transmission shaft is disposed on the bracket, and the crank is disposed on the transmission shaft. The crank rotates synchronously with the transmission shaft, and the belt pulley is disposed on one end of the crank via the pin shaft. One end of the belt bypasses the crown sheave, and is connected to a smooth sucker rod.

Abstract: A variable compression ratio apparatus with means to vary compression ratio of an internal combustion engine is provided. The variable compression ratio apparatus with reciprocating piston mechanism with extended piston offset of the invention has a rocker arm/lever assembly pivotally mounted on a crankpin of a crankshaft and a fulcrum which moves along only within confines of a pathway/guide. This confined pathway/guide itself can be either pivoted to swing from side to side on a pivot or can move only along a predefined path towards the crankshaft and away in its own defined tracks. A swing or move of the pathway/guide leads to a corresponding change in stroke positions of the piston within the cylinder. Such construction allows a simple and easy way to vary compression ratio of the engine. At the same time all benefits of the reciprocating piston mechanism with extended piston offset are preserved.

Abstract: An exercise machine comprises an oval-shaped structure, two driving arms, two swing handle and two slidable bars. The fly wheel of the oval-shaped mechanism simultaneously drives the driving arms and the swing handle, and the slidable bars are pivoted onto the assembling portion of the swing handle and rest on the shaft of the fly wheel such that the movements of the slidable bars are not limited by the driving arms and longer the travel stroke of the fly wheel.

Abstract: The present invention provides a safety unit comprising: a case; a rotary linkage disposed at one end thereof at the outside of the case and rotatably mounted at the other end thereof to the case; a force transfer shaft mounted to one side of the rotary linkage in such a fashion as to be oriented perpendicular to the rotating plane of the rotary linkage; a crank linkage rotatably mounted at one end thereof to the inner side of the case and adapted to abut against the force transfer shaft at the outer circumferential edge thereof so as to be transferred with an external force to be rotatably moved; and a support means rotatably connected to the other end of the crank linkage and adapted to allow for the rotation of the crank linkage when an external force having a value larger than a predetermined threshold value is exerted to the rotary linkage.

Abstract: An improved piston engine includes a rocker arm and a connecting link between the piston rod and the crankshaft to allow its motion to be altered from that of the classic piston engine in order to overcome inherent limitations of the latter and realize greater efficiency. By inserting these two components between the end of a rigidly attached piston rod and a conventional crankshaft, the motion of the piston with respect to the crankshaft can be altered in important ways. For example, the dwell at top dead center can be increased relative to dwell at bottom dead center to the point where they are equal or in fact where dwell at top dead center is greater. Furthermore, because the piston rod is not directly connected to the crankshaft, ignition of the fuel can be timed to occur before top dead center so that pressure is maximized at top dead center in order to improve efficiency. Furthermore, the piston stroke can be shortened and slowed by the geometry of the rocker arm, thus increasing engine life.

Abstract: In a toroidal continuously variable transmission, a roller-and-cage bearing assembly is interleaved between a power-roller outer ring and a trunnion power-roller accommodating portion to permit a parallel translation of a power roller in an axial direction of input and output disks. A cage of the roller-and-cage bearing assembly is formed with an oval slotted hole. A disk-shaped member is attached to the trunnion power-roller accommodating portion. The slotted hole and the disk-shaped member are fitted to each other to define a predetermined clearance that limits a displacement of the roller-and-cage bearing assembly in a direction perpendicular to both a rotation axis of the power roller and a trunnion axis to a set displacement.

Abstract: A reciprocating piston engine (or motor) includes plural reciprocating pistons operatively connected to a single intermediate oscillating shaft, and a crankshaft having a single crank pin operatively connected to the oscillating shaft, so that the crankshaft experiences one complete revolution for each back-and-forth reciprocation of the pistons. The connection between the pistons and the oscillating shaft can include a rack-pinion drive system or a link-lever drive system. The connection between the oscillating shaft and the crankshaft can include a sector gear in mesh with a toothed rack that operates a connecting rod attached to the crank pin; alternately a lever-connecting rod drive mechanism can be used between the oscillating shaft and the crankshaft.

Abstract: An assembly for limiting axial motion of a shaft, such as a roller, in an imaging apparatus having a frame, a drive system including a helical drive gear, a shaft supported by the frame and a driven helical gear attached to the shaft and positioned to engage the helical drive gear, wherein driving the driven helical gear in a first rotational direction results in an axial thrust of the shaft in a first axial direction. The assembly includes a thrust member which has an engagement end and a mounting end. The engagement end has a first cross-sectional dimension and the mounting end has a second cross-sectional dimension that is larger than the first cross-sectional dimension. The thrust member is positioned to be co-axial with the shaft and is coupled to at least one of the shaft and the driven helical gear. A thrust bracket is mounted to the frame.

Abstract: The transmission mechanism comprises a lever (12) which can rotate around an eccentric shaft (11) of a rotating disk-crank (10). The lever (12) is guided in its movement by cam means (15a) and acts upon an arm (19) which is attached for joint rotation to an output shaft (3). Advantageously the disk-crank (10) is driven through a connecting rod (8) from another disk-crank (1) which can rotate around a shaft which is different from that of the first disk-crank (10). It doesn't require adjustment or setting up and it has a low cost. The transport device has on the output shaft the wheels for drawing chains with transporting bars provided with clamps for the sheets.

Abstract: Water-raising pump for drawing water in a ground water table, which pump comprises a tube connecting the surface to the water table to be pumped, a rod carrying the pistons, which is connected to a drive mechanism installed at the surface for imparting to the rod a reciprocating pumping motion. The mechanism comprises: two identical toothed wheels (7, 8), mounted on axes (72, 82) that are symmetrical relative to the trajectory (ZZ) of the rod (3) carrying the pistons, meshing in each other so as to rotate in opposite directions, a motive unit (9, 10, 11) connected to at least one of the wheels (7) to drive it in rotation, two identical connecting rods (12, 13) each connected to the head (14) of the rod (3) and to a point of articulation borne by each toothed wheel (71, 81), in symmetrical positions, in order to be driven in symmetrical motions relative to the trajectory (ZZ) of the rod (3) in order to guide and drive the rod and its pistons.

Abstract: A link mechanism for a reciprocating piston engine and the like is characterized in that: motions of a pair of cylinder-type pistons moving in opposite directions relative to each other are converted into an oscillating-type rotary motion through an oscillating arm provided with a right and a left portion, which portions are equal in mass and in turning radius of their oscillating-type rotary motions; and, the oscillating-type rotary motion is divided into two equal parts by connecting rod means and transmitted to the link mechanism in which the two equal parts of the oscillating-type rotary motion are converted into a rotary motion of a rotary shaft incorporated in the link mechanism.

Abstract: A connecting rod unit is eccentrically supported on the drive shaft. The connecting rod unit is pivotally mounted via link members to double arm levers. Each double arm lever is pivotally mounted to a single arm lever. Furthermore, each single arm lever is coupled at its end remote from the double arm levers to a device for the adjusting of the height position of the ram. Each single arm lever supports a pressing column. These pressing columns are pivotally mounted to the ram. Accordingly, the structural members which transmit the driving force from the connecting rod unit to the pressing columns can be designed extremely stiff and with a minimal springiness. Also, all structural members located between the connecting rod unit and the ram, inclusive the ram, are designed in such a manner that no additional balancing forces for the vertical mass force balancing are needed.

Abstract: Device for the adjustment of the stroke length of a needle carrier (12) of a pickling machine, which can be moved back and forth in such a way that the lower deadpoint of the needle carrier is independent of the stroke length, is characterized by the fact that needle carrier (12) is articulated with an intermediate lever (24) that can be turned around a rigid axis (26) and this lever (24) is joined in turn via a connecting rod (22) with a crankshaft (18) driven in rotation, and that coupling point (32) of connecting rod (22) on intermediate lever (24) can be adjusted in a connecting link (34), which runs concentric to the axis of rotation of crankshaft (18) in the lower dead-point position of intermediate lever (24).

Abstract: A reciprocating machine converts linear motion to rotary motion or vice-versa and is associated with a supply of working fluid, and includes rotational power apparatus having a rotational motion transfer member; a cylinder defining a longitudinal axis and having a first end at which are located working fluid input and output apparatus, and further having a second end; a piston located within the cylinder and arranged for linear, reciprocating travel along the longitudinal axis between the first and second ends; a connecting rod having a first end connected to the piston, and further having a second end portion; and linkage apparatus.

Abstract: The massage apparatus includes a casing having a bottom and a top with an elongated opening formed through it. An elongated support is provided on the top of the casing in the direction of the elongated opening. A pair of spaced upright rods is pivotally mounted on the bottom of the casing. An inverted T-shaped frame includes two lateral arms pivotally mounted to upper ends of the upright rods and an intermediate arm upwardly extending from the two lateral arms and through the elongated opening of the top to connect with the support. A driving unit provided in the casing moves the upright rods to swing about the pivot point within a predetermined angle when the driving unit is actuated.

Abstract: An apparatus that converts a rotary motion into linear motion through the use of a linkage system that has a pair of levers that are driven through a pulley arrangement. Wherein, the pair of levers and pulley arrangement are configured to produce a variable linear drive.

Abstract: A power transmission device for a press machine comprises a connection link connected to a crankshaft of the press machine and reciprocated in accordance with the rotation of the crankshaft, a first slider provided in a frame of the press machine so as to be reciprocated in a first direction, and pivotally connected to the connection link, a first link mechanism provided with a pair of first links pivotally connected to each other, wherein one of the first links is pivotally connected to either the connection link or the first slider so as to be folded and extended while following up the reciprocating movement of the connection link, a second slider provided in the frame displaceably in the first direction and pivotally connected to the other first link, and a mechanism for adjusting the position of the second slider in the first direction, whereby the bottom dead center position and the stroke length of a slide can be adjusted by a common mechanism.

Abstract: A unique valve mechanism for opening and closing inlet, outlet, and purge valves in a regenerative incinerator is disclosed. The valves are mechanically opened and closed by a cam arrangement which insures proper timing, and optimal volume flow through the valves during each cycle. Further, a method of the present invention begins the purge mode while the inlet valve is opened, and completes it after the outlet valve has opened. This reducing the required time for each cycle of operation.

Abstract: A retrofit apparatus for providing a signal indicative of the position of an aircraft control surface comprises a rotary coupling flexibly coupled to the control surface, an extensible coupling driven by the rotary coupling, a quadric-chain linkage coupled to the extensible coupling for converting a linear output into a substantially translatory displacement, a linkage for converting the translatory displacement into a substantially angular motion, and a transducer coupled to the linkage for converting the angular motion into an electrical output indicative of the position of the aircraft control surface. The invention is a simple modification to an existing quadric-chain linkage driving a mechanical indicator, enabling an electrical transducer to be retrofitted in the crowded control stand of an aircraft.

Abstract: A material loading apparatus for material working machines comprises loading slide elements for stepwise conveying one of a wire and strip material guided in a main guide along a guidance direction. The loading slide elements having a controlled slide-mounted material clamping device, an oscillating drive connected to the loading slide elements and a controlled material holding device. Stopping of the material clamping device at its extreme positions along the main guide is achieved via slide abutments. A resilient transmission system is provided in the driving connection between the oscillating drive and the slide-mounted clamping device. The loading slide elements have, in connection with oscillating drive, a main slide guided in a main guide and a secondary slide provided on the main slide and capable of moving substantially parallel to the main guide.

Abstract: In the case of a drive for a male-die-side ejector slidably disposed in a slide of a mechanical metal-forming press having an angle lever which is pivotably disposed at the slide, one leg of the lever acting upon the end of the ejector facing way from the male die and the other leg thereof being acted upon by a control cam which is driven in a timed manner and being held in contact with this control cam, a free adjustability of the moving characteristics of the ejector is achieved in that the control cam is provided at a control carriage which is slidable in a guide fixed at the frame in parallel to the moving direction of the slide, and at which a control connecting rod is applied in a bearing, this control connecting rod, at one end, being disposed eccentrically on a shaft serving also as the drive of the slide.

Abstract: The invention pertains to a saw, in particular to a jig saw or scroll saw, with a saw blade which is driven by a force acting on a parallelogram of rods. A saw blade is attached to a connecting shank which joins two longitudinal side arms. The two longitudinal side arms are designed to move in their longitudinal direction. On at least one of the two longitudinal side arms a guide element in the form of, for example, a turning roller, is positively guided against a stationary guide surface which is at an angle, preferablye an acute angle, to the connecting shank. As a result of this positive guidance, the backward movement of the saw blade from the cut edge during the return stroke is reduced to a desired value. Thus a jig saw of small size, but with a large stroke, can be realized in which the saw blade is guided parallel to the cut edge at all times but is moved back by a small amount from the cut edge during the return stroke.

Abstract: A motion transfer mechanism for a machine includes a coupler interconnecting a one-arm crank member and the first crank arm of a two-arm crank member. A driving plate is mounted rotatably on the machine and has a cam edge. Any line, which connects any pair of points on the cam edge and also passes through the rotating axis of the driving plate, is at a predetermined distance. An input unit is connected to the driving plate so as to rotate the driving plate. A pair of roller followers are mounted pivotally on the coupler in association with the cam edge of the driving plate. The connecting line of the roller followers passes through the rotating axis of the driving plate. An output unit is connected to the second crank arm of the two-arm crank member. When the driving plate is rotated so that the roller followers slide along the cam edge of the driving plate, the one-arm and two-arm crank members are rotated so as to activate the output unit.

Abstract: A wiper device including a wiper motor and two wiper blades for wiping a vehicle windshield comprises a reciprocally actuating coupling rod connected to the wiper motor by a crank arm, a swinging lever which is connected to the coupling rod so as to swing, a first wiper arm which is fixedly connected with one of the wiper blades and is swung with the swinging lever, a second wiper arm which is fixedly connected with another of the wiper blades and swings in tandem with the first wiper arm according to reciprocal movement of a link rod connected to the swinging lever, and a mechanism or enabling movement of linkage positions relative to the swinging lever, the coupling rod and the link rod, accompanied by a snap action.

Abstract: An air compressor in which a piston is reciprocated in a cylinder by means of an eccentric. The eccentric is connected to the piston by means of a linkage consisting of an arm, a connecting rod and a control link. By virtue of the arm and the control link, the speed of the piston is greatly reduced as the piston approaches the terminal end of its compression stroke.

Abstract: A system for converting the output of a constant speed motor to variable fluidic flow at the ends of a linear actuator comprising a drive gear coupled with an electric motor for concurrent rotation at a fixed rotational speed; a driven gear operatively coupled to the drive gear; a drive train operable in response to rotation of the drive gear to rotate the driven gear, the gear train including adjustment mechanisms for selectively varying the rotational orientation between the drive and driven gears; a pump having a pair of spaced cylinders in axial alignment with pistons coupled through a reciprocal connecting shaft and with a connector rod pinned at its midpoint to the connecting shaft for oscillation; rigid links coupling the ends of the connector rod with the drive and driven gears so that rotation of the drive and driven gears will oscillate the connecting rod and reciprocate the connecting shaft at a speed correlated to the orientation of the adjustment mechanisms of the gear train; and fluidic lines co

Abstract: Device for converting the rotary motion of an eccentric driven by a motor shaft into an oscillating motion of a working tool in electrically powered appliances, consisting of a double-armed rocker arm and a connecting rod connecting the rocker arm with the eccentric, as well as a single articulation at whose articulation midpoint all the motion axes of the connecting rod and rocker arm meet directly or indirectly.

Abstract: A wiper driving system for a vehicle having a wiper link reciprocated by a crank of a motor, and a lever for rotating a driving shaft of a wiper arm fixed to one end of the wiper link by rotating at a predetermined angle with the one end of the wiper link as a fulcrum by the reciprocation of the wiper link which comprises:an intermediate link interposed between the other end of a first lever of the above-said lever and the wiper link to be pivotally supported to each other,a second lever pivotally supported at its one end to a pivotal shaft for coupling the wiper link to the intermediate link,a switching lever for switching the second lever and the other link connected to the second lever between two positions, said switching lever disposed in a direction crossing the longitudinal direction of the second lever to be pivotally supported to an automotive body, the other end of the second lever being pivotally supported to one end of the switching lever, anda turn-over spring provided at the switching lever for

Abstract: A mechanism for transferring movement between two reciprocating bodies, such as pistons or displacers (10, 11) comprises a crank or eccentric (12) and may be included in a Stirling or Vuilleumier engine. The crank or eccentric is connected to a connecting member (13) by means of a bearing or pivot (D). The connecting member (13) is connected to one (10) of the pistons or displacers via a second pivot (X) and to one arm (16) of a lever (15) by means of a third pivot (A). The pivots (A, D, X) of the connecting member (13) defines the vertices of a triangle. The other arm (17) of the lever (15) is pivotally connected to the other piston or displacer (11).The arms (16, 17) of the lever (15) may define an angle therebetween, and this angle may be selected so as to obtain a desired angle between the directions of the movements of the pistons, for example an angle of 90.degree..

Abstract: A self-travelling vibration generator having a travelling frame movably supported by parallel rails, a lifting/lowering frame standing at substantially right angles with respect to the travelling frame, a plurality of eccentric rollers provided off-center with respect to a roller shaft rotatably provided on the lifting/lowering frame; and having such a construction that an induction motor is used for at least either of a motor for travelling the travelling frame or a motor for rotating the roller shaft so as to cause the eccentric rollers to give vibrations to a human body while travelling on the human body.

Abstract: An improved linkage which is advantageously used in linking the crank of a Stirling machine to its coaxially reciprocating pistons. A swing lever having at least three spaced pivot axes is connected at one of its pivot axes to the machine housing and at a second pivot axes to one of the pistons. A bell crank, also having at least three pivot axes which are triangularly arranged, is rotatably connected at one of its pivot axes to the crank throw pin and pivotally connected at a second one of its pivot axes to the other piston. The bell crank is pivotally connected at its third pivot axis to the third pivot axis of the swing lever.

Abstract: A fail-safe actuator of the type which permits cycling of a control member during normal operation without encumbrance from a return mechanism includes a link having a slot. A pin secured to a crankshaft coupled to the controlled member is slidably disposed within the slot. The slot permits rotation of the crankshaft within a range defined by the slot length. Upon system failure, a fluid pressure is moved to a predetermined position by a biasing spring to force the crankshaft to a fail-safe position.

Abstract: A mechanism for converting rotary drive motion into reciprocal rectilinear motion including structure for varying the length of the rectilinear stroke.

Abstract: An adjustable drive mechanism for reciprocating a pair of sealing jaws in a packaging apparatus and controlling the stroke length includes a drive belt operatively connected to move the carriage and jaws in the up and down direction. A movable pulley assembly interconnects the drive belt ends and is attached to a working arm oscillated by a linkage arrangement. The linkage arrangement includes a rocker oscillated with a crank and connecting rod. A control link pivotally connected to the rocker completes the linkage and deflects to allow raising of the working arm and driving the sealing jaws on a downward draw stroke. The upper end of the control link constitutes an adjustable pivot to vary the degree of movement imparted by the working arm to the drive belt. The adjustable pivot is carried by an annular adjustment ring mounted within an annular guide groove of a mounting plate.

Abstract: A pumping unit such as used on an oil well, the unit having a base, an upright sampson post supported on the base, a drum rotatably supported to the sampson post, the drum being rotatable about its horizontal axis, a lever arm pivoted to the base and in a direction to and away from the vertical sampson post, a weight arm pivotally affixed at one end to the upper end of the lever arm, a counterweight affixed to the outer end of the weight arm, a cable extending over the drum having one end secured to the lever arm and the other end hanging in a vertical position from the drum and adapted to be attached to pumping equipment such as an oil well polish rod, a gearbox driven crank arm connected by a pitman arm to the lever arm to pivot the lever arm back and forth towards and away from the sampson post to thereby cause the cable to reciprocate over the drum and a linkage connected to the weight arm to cause it to pivot as the lever arm is pivoted so that the counterweight reacts to offset the weight of pumping equ

Abstract: Drive for producing motion with intervening dwells including a four-bar linkage defining a couple curve travel path traversible only in part and having equally coincident forward and return paths, and a dwell-producing driven rocker arm pair connected thereto, the couple curve travel path having a vertex therein dividing the couple curve travel path into a short curve path for producing a dwell and an elongated curve path extending at an angle to the short curve path for producing a movement, the vertex of the couple curve being identical with an instantaneous pole defining the start and end of the dwell.

Abstract: A bell-crank lever having substantially stiff lever arms, which are approximately at right angles to each other, is connected to a stationary part by a film hinge that is secured adjacent to the junction of the lever arms and defines a bending axis which is at right angles to the plane of the bell-crank lever. An oscillating arm is secured to the free end of one of said lever arms and extends approximately parallel to the other of said lever arms and about film hinges which define bending axes that are at right angles to each other is bendable in the plane of the bell-crank lever and at right angles to that plane. An oscillating beam bar is connected to the other of said lever arms by a film hinge defining a bending axis at right angles to the plane of the bell-crank lever. The oscillating arm has in its free end portion a bearing bore for connection to a driving crank pin. The oscillating beam bar is substantially aligned with the axis of rotation of said crank pin.

Abstract: An eccentric shaft is rotatably mounted in a frame, in which a ram is vertically and slidably mounted. First and second connecting rods are provided, each of which has an inner end rotatably mounted on the eccentric shaft. The first and second connecting rods are arranged to perform mutually opposing motions in response to a rotation of said eccentric shaft. The frame carries first and second slot-defining members, which are disposed on opposite sides of the eccentric shaft and define first and second guide slots, respectively. The latter are horizontally aligned and arranged to guide the outer ends of the first and second connecting rod means, respectively. In addition, first and second ball crank levers are disposed on opposite sides of the eccentric shaft and pivoted to the ram. The first and second bell crank levers have first and second output arms, respectively, which are operatively connected to the ram, and first and second guide arms, respectively, which extend at an angle to said output arm.

Abstract: The present invention is concerned with a dual stroke drive mechanism of any size for a reciprocating device, such as a piston of a pump. It is particularly concerned with such a driving mechanism having means for selecting a particular stroke-length. It is more specifically concerned with a drive mechanism capable of imparting either one of two set stroke-lengths and means for selecting one of the stroke lengths before, or at certain intervals during, operation of the mechanism. The drive mechanism converts rotary movement of an input member into reciprocating rectilinear movement of an output member which may be connected to a piston and reciprocates the latter. A preferred application is in the field of sampling pumps for distributing liquid samples of small sizes into vials for analysis.

Abstract: The invention relates to a crank drive, particularly to a crank drive for photographic cameras having a crank including a crankpin, and a drawbar pivotable about the crankpin. The drawbar consists of first and second rods connected to one another, and disposed in respective substantially parallel planes, which rods are joined or connected by a hinge having a hinge axis substantially parallel to the crankpin axis.

Abstract: A link drive mechanism for vertically moving the slide of a mechanical press comprises a power driven eccentric unit carried by a horizontal shaft arranged substantially vertically above the connecting means for the slide and having first and second adjacent eccentrics, a first eccentric strap carried by the first eccentric and extending downwardly therefrom and having first and second laterally arranged pivot connections, a first link pivotally connected between the first pivot connection and the connecting means for the slide, a second eccentric strap carried by the second eccentric and extending laterally therefrom, a substantially vertically extending fulcrum lever arranged laterally from the horizontal shaft and pivoted intermediate its ends and having one of its arms pivotally connected to the second eccentric strap, and a second link pivotally connected to the other arm of the fulcrum lever and to the second pivot connection of the first eccentric strap.

Abstract: There is disclosed a precision drive mechanism having a base member with a drive plate slidably connected thereto, the drive plate having an elongated slot engaged by a bearing member, which in turn is threadably coupled to a lead screw. A pivot frame having an elongated arm is pivotally connected to the base member and is slidably engaged by the bearing member, the pivot frame being adapted to be connected to a source of fixed reciprocating motion whereby the drive plate is moved by the pivot frame in variable reciprocating motion precisely adjusted by moving the bearing member along the elongated arm of the pivot frame through rotation of the lead screw.

Abstract: An apparatus mounted on a weaving loom for moving a weft thread carrying mechanism from one end of a loom lay to the other through the shed of the warp threads. The apparatus includes a linkage having a drive mechanism which is rotated continuously and which maintains the weft thread carrying mechanism in a fixed position for an extended dwell period and then propels the weft thread carrying mechanism across the lay after the lay has beat up a prior weft thread and has been retracted to an inoperative position. The apparatus provides a substantial reduction in the noise level and power requirement over conventional looms and permits the speed of operation to be increased to improve production.

Abstract: Apparatus for driving the lay of a weaving loom and including one or more four-bar linkages arranged independently, in parallel, or in series with one another in a manner to advance and retract a loom lay during a fractional portion of the rotation of a crank and providing an extended dwell period for the lay during the remaining portion of the rotation of the crank.