Abstract: Various disclosed embodiments include illustrative drive unit controllers, drive units, and vehicles. In an illustrative embodiment, a drive unit controller includes a processor having computer-readable media configured to store computer-executable instructions configured to cause the processor to receive free-wheel tow mode activation information, activate a hold mode based on the received free-wheel tow mode activation information, generate a zero-speed command in response to the hold mode being activated, and send the generated zero-speed command to a stabilizing system of the associated vehicle.

Abstract: A manipulator includes: an operating unit, and a bending assembly that is bent by operation of the operating unit, wherein: the bending assembly includes: a first link member having a first arc portion, a second link member having a second arc portion, an intermediate link member that includes a first intermediate arc portion and a second intermediate arc portion in opposition to the first intermediate arc portion, and is mounted between the first link member and the second link member.

Abstract: A mount for a shaft includes a collar, disposable around the shaft, a first mating piece and a second mating piece. The collar includes first and second tapered outer surfaces that taper away from each other. The first mating piece has a first tapered aperture that is configured to mate with the first tapered outer surface of the collar. The second mating piece has a second tapered aperture configured to mate with the second tapered outer surface of the collar. The first and second mating pieces are adapted to be aligned such that when the collar is mated with the first and second mating pieces, the shaft is substantially perpendicular to the first mating piece.

Abstract: The dispensing system of the present disclosure provides a convenient way for a user to dispense product onto a workpiece, food product, or similar item. A foot pedal can be connected to one end of a cable, and a plunger can be connected to a second end of the cable. The plunger can have two members or levers that compress toward each other when the user steps on the pedal, drawing the cable taut.

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: An auxiliary braking device for use in a towed vehicle has an actuator with a moving element that connects via a cable or the like to a brake pedal arm of the towed vehicle. A pulley or similar redirection device is located in the space behind the brake pedal arm with the cable being routed from the actuator to the brake pedal arm via the pulley ensuring that the line of pull on the brake pedal arm is in the direction of the brake pedal's normal movement. The actuator may be a pneumatic actuator that is controlled by pressurized air from an air compressor of a controller.

Abstract: In one embodiment, an actuator includes a moving frame coupled to a fixed frame by a plurality of elongated parallel motion flexures for generally parallel motion relative to the fixed frame and between an as-fabricated position and a deployed position. The flexures are disposed at a first angle relative to a line extending perpendicularly to both the moving frame and the fixed frame when the moving frame is disposed in the as-fabricated position, and at a second angle relative to that same line when the moving frame is disposed in the deployed position, Arcuate movement of the first frame relative to the second frame is controlled by constraining the first angle to a value of less than about half of the sum of the first and second angles.

Abstract: An active bearing at least for vibration reduction is described, comprising a) an interface (7) to be fitted to a load (8); b) at least one support element (3) in an operative connection with the interface (7) and a support unit (6); c) at least one linear actuator (5) supported indirectly or directly on the support unit (6); d) a gear unit (4) for the path transmission of an actuating path change originating from the linear actuator (5), said gear unit being in an operative connection with the at least one linear reactor (5); e) at least one decoupling unit (1), which serves for the decoupling of the static load transfer and for transmitting the dynamic load transfer; wherein the at least one linear actuator (5), the gear unit (4) and the at least one decoupling unit (1) are disposed serially.

Abstract: A linear actuator suitable for mobilizing a load comprises: a leg linked to the load by one of its ends with a ball joint with three degrees of freedom in rotation; a plate that is mobile in translation along an axis belonging to a plane of a support of the actuator, said mobile plate being mechanically linked to the leg by its other end. The linear actuator also comprises at least one first elastic cable, fixed by one of its ends to the mobile plate, and fixed by its other end to the support, being engaged in a first pulley fixed to the support. The actuator can notably be used to mobilize a simulation platform mounted on a hexapod.

Abstract: A passively torque-balanced device includes (a) a frame; (b) a drivetrain including a drive actuator mounted to the frame and configured for reciprocating displacement, an input platform configured for displacement by the drive actuator, a plurality of rigid links, including a proximate link and remote links, wherein the rigid links are collectively mounted to the frame, and a plurality of joints joining the rigid links and providing a plurality of non-fully actuated degrees of freedom for displacement of the rigid links, the plurality of joints including a fulcrum joint that is joined both to the input platform and to the proximate rigid link; and (c) at least two end effectors respectively coupled with the remote links and configured for displacement without full actuation.

Abstract: A drive device for a Bowden control comprises at least one electric actuator and a mechanism connected to the Bowden control. The actuator and mechanism are surrounded by at least one housing. The housing comprises a closable cover in a connecting region between the mechanism and the Bowden control.

Abstract: A rotary actuator assembly is provided. The assembly has a flexible member that is attached to a piston for linear movement. The flexible member is also attached to a pinion for pivotable movement.

Abstract: Apparatus for foot operating an electrical element having a rotatable operating shaft comprising a base member adapted to be secured to a floor and defining a top opening cavity, a shaft rotatably mounted in opposite side walls of the base member, a treadle member mounted to the shaft and arranged to rotate the shaft when depressed by foot pressure, a support member secured to the base member in the cavity and having at least one upstanding wall, an electrical element having a rotatable operating shaft mounted to at least one upstanding wall, an operating arm mounted at one end thereof to said shaft and extending to a free end thereof toward said electrical element operating shaft, said free end including a surface, a flexible cord connected at one end thereof to said operating arm toward the end of said of said operating arm mounted to said shaft, extending over said surface, spirally wrapped a plurality of times about said electrical element shaft and anchored at its other end to a point on the base member.

Abstract: The pivot-less Watt linkage supports a first rigid element relative to a second rigid element and permits relative motion between the rigid elements. The pivot-less Watt linkage comprises an elongate, rigid, floating beam, an elongate first flexible beam, an elongate second flexible beam and a flexible member. The first flexible beam extends in a first direction from a first point on the floating beam to the first rigid element. The second flexible beam extends in a second direction, substantially opposite the first direction, from a second point on the floating beam to the first rigid element. The second point is spatially separated from the first point along the length of the floating beam. The flexible member extends in the first direction from a third point on the floating beam to the second rigid element. The third point is intermediate between the first point and the second point.

Abstract: A displacement modifying structure for receiving an input displacement from a motor source and generating a multiplied displacement therefrom for provision to a load. The structure includes a static beam and a dynamic beam. The static beam has a fixed end and a movable end while the dynamic beam has a first end and a second end. The first end of the dynamic beam is connected between the motive source and the movable end of the static beam. The second is also connected through a pivotless joint to the movable end of the static beam. Upon movement of the first end over a first distance by the motive source, the second end of the dynamic beam and the movable end of the static beam move over a second distance for provision to the load. The second distance, or output displacement is greater than the first distance.

Abstract: An anti-skid mechanism operating device includes an operating unit and an operating arm pivotally supported thereby and intended to carry a rotary anti-skid and to operate the latter between an active position and a passive position. The operating unit is formed with a linear drive and a rotationally mounted rotary device, which is connected to the operating arm. A string-like drive transmission element extends essentially along the longitudinal axis of the drive, between the drive and the rotary device, in order to translate a linear movement of the drive into a pivotal movement of the operating arm in two opposite directions.

Abstract: A latch for installing and removing a disk drive from an enclosure. The latch comprises a pair of guide members (14, 16), a disk drive support (12), and an actuator (40, 140). The actuator includes a pair of pinions (42, 142) in meshing engagement with teeth on the guide members (14, 16) for moving the disk drive in a linear direction.

Abstract: A fan has an associated centrifugal mechanism and a shutter, comprising a plurality of pivoted vanes and a central vane pivotally interconnected with a pair of heavy tie rods. The centrifugal mechanism is driven by the fan propeller and comprises a hermetic housing wherein are located, symmetrical spaced apart in rapport to the fan axis, at least a pair of radial sliding masses operatively connected with flexible cables to an axial sliding reciprocating actuator which is disposed at proximity of the shutter central vane. When the fan starts to operate in either direction by an electric motor, the radial masses slide radially by centrifugal action and pull the axial reciprocating actuator away from the central vane, allowing the shutter heavy tie rods, to open the shutter. When the fan stops, an internal spring housed within the axial sliding reciprocating actuator pushes it against the central vane causing the closing of the shutter.

Abstract: Compliant mechanisms are arranged to enable airfoil and other structures to adapt their shapes to different flight conditions and thereby achieve optimum lift:drag ratios in plural flight conditions. The compliant mechanisms can be formed integrally whereby a compliant frame thereof, or the skin of the airfoil, undergo elastic or other deformation to produce the desired displacements in direct response to applied forces. In an airfoil context, shape changes can be effected by the leading and trailing edges of the entire airfoil system. In addition, the driver arrangements of the compliant mechanisms can be controlled individually to effect a desired surface contour throughout the length of the wing, illustratively a twist therein.

Abstract: A device for covering and uncovering an opening of a container for a truck or trailer has a pair of pivotal arms that are mounted along opposite sides of the container with each arm having an outer and inner end. A cross-member is mounted between the outer ends of the pivotal arms so that the pivotal arms are coupled together. The inner end of each arm is mounted to the truck or trailer at a pivot point so that arms can be pivoted between a starting position and an end position. A flexible covering is coupled to the outer ends of the arms and is drawn or withdrawn over the opening when the arms are moved to the end and starting positions. The arms are moved by providing a convex arcuate contact portion located about the pivot point of the arm. A piston rod and cylinder are mounted adjacent the contact portion. An arm engagement member is coupled to the piston rod and cylinder and engages the contact portion of the arm so that linear movement of the arm engagement member causes the arms to pivot.

Abstract: An accessory attachment/conversion assembly is disclosed for use on a small front-end loader type of construction implement. One form of accessory would be a backhoe bucket. The attachment assembly includes a frame for detachable mounting to the implement and includes a rotatable drum pivotally secured to the frame and rotatable in its mounting by means of chains, or other suitable forms of transmission means, which are secured at one of their ends to the drum and at their other ends to a hydraulic cylinder mounted on the frame. An elongated arm or boom is secured at one end to the drum and extends outwardly thereof. The outer terminal end of the boom can carry a bucket or other suitable accessory. The arrangement being such that the boom and bucket can be swung approximately full left to full right, almost 180.degree..

Abstract: A chair type massaging apparatus comprising: a seat; a footrest which is pivotally mounted on a front end portion of the seat; a pivotal member for pivoting the footrest between a projecting position at which the footrest is substantially horizontally projected forwardly of the seat and a retractive position at which the footrest is retracted below the seat substantially vertically; an operating lever for actuating the pivotal member and a locking portion for effecting or cancelling locking of the footrest at a predetermined pivotal angle between the projecting position and the retractive position, which is provided on the operating lever.

Abstract: A pumping unit apparatus is provided for operating a well pump having sucker rod drive which is reciprocated from an uppermost position to a lowermost position, the apparatus having a base, a support structure mounted on the base, a member mounted on the support structure for pivotal movement about an axis and means connected to the member for pivoting said member between the two positions. Belting and pulley combinations mounted on the member and connected to the sucker rod provides rod string positioning to the rod string uppermost position when the member is on one position and a lower position when the member is in another position; a counterweight mounted on the member for movement with said member is provided wherein the counterweight is positioned relative to the axis so that the force of gravity acting on the counterweight applies a greater torque to the member when the rod string is in its uppermost position than is applied when the rod string is in its lowermost position.

Abstract: A short take off and landing (STOL) aircraft is optimized for STOL performance and flight at minimum airspeed. The aircraft includes leading edge wing slats that are extended and retracted under the direct manual control of the pilot. The aircraft further includes an aileron/flap mixing mechanism that automatically droops the ailerons when the flaps are lowered. A flap bellcrank, which pivots to lower the flaps, carries a pair of pulleys. Aileron control cables, that actuate an aileron bellcrank to raise and lower an aileron, are threaded around and between the two pulleys. When the flap bellcrank pivots to lower the flap, the pulleys vary the positions of the aileron control cables relative to each other to pivot the aileron bellcrank and thereby lower the aileron. The aileron control cables remain independently movable to maintain pilot control over the bank and roll of the aircraft.

Abstract: A bicycle control device wherein a base member is provided for attachment to a structural member of the bicycle, and a control member is mounted for movement relative to the base member. A relay cable has a first end secured relative to the base member and a second end secured relative to the control member so that movement of the control member relative to the base member causes the first end of the cable to move relative to the second end of the cable. A linking member is disposed between the first end of the cable and the second end of the cable for movement with the cable. The linking member has an attachment location for attaching a control element of the bicycle to the linking member. The device may then operate according to the principle of a ruunning block.

Abstract: A remote operation mechanism for a stroller is disclosed in which a fail-safe mechanism is reset to its initial position so as to be interlocked for every remote operation without fail, to thereby be able to automatically lock preventing operation of the system. The remote operation mechanism for a stroller includes a frame, an opening/closing operation lever having an end operable for ascending and descending along the frame, a pulley rotatable so as to be interlocked with the ascending/descending operation of the operation lever, a lock plate, an ascension regulating plate, a lock plate reset spring, a stopper formed on the lock plate and an operating projection formed on the pulley, wherein the operating projection abuts against the back of the lock plate.

Abstract: An apparatus comprising a rotating element, a rotary to linear converter, a linearly moving element that linearly extends and retracts when the rotating element rotates in first and second directions, a rotary sensor assembly, integrally constructed with the rotating element, for determining relative movement of the rotating element and for thereby determining relative movement of the linearly moving element, a linear sensor assembly, integrally constructed with the linearly moving element, for providing an absolute position signal each time that the linearly moving element extends or retracts to a predetermined position.

Abstract: The present invention relates to a linkage actuator for effecting all rectilinear or rotative movements, acting on the elements (1 and 2) constituting the linkage, characterized in that it acts directly on the linkage axle (3) and in that it is preferably constituted by at least one jack (4) and by chains or cables (5) guided on the one hand on the linkage axle (3) and on the other hand on the pinions or pulleys or grooved wheels (6), the jack (4) coacting with the chains or cables (5) and if desired with the linkage axle (3), which is integral at its ends with one of the elements (1 or 2), the other element (2 or 1) housing the actuator.

Abstract: A transmission mechanism for a magnetic damping type step machine includes two supporting plates bilaterally fastened to a machine base in the middle to hold a main shaft, a double-groove spool mounted around the main shaft to hold a flywheel, two pedals pivotably connected to a rear crossbar of the machine base at either side, each pedal having pedal rod with a foot plate and a linking rod with a locating plate respectively disposed at two opposite sides by the respective supporting plate, and two transmission wires, each transmission wire having one end wound round either groove of the double-groove spool in either direction and an opposite end turn over pulleys on the respective supporting plate and the locating plate of the respective pedal.

Abstract: Apparatus for wringing mops, sheets, strips or other wet commodities has a housing which can be placed on top of a bucket and contains a first roller and a second roller movable radially toward and away from the first roller. The mechanism for moving the second roller toward the first roller comprises a pivotable lever which can turn two sector-shaped collecting elements each connected to the trailing end of a discrete flexible elastic pusher the front end of which engages a bearing for the second roller. The pushers are confined to movement along selected paths while they push the second roller toward the first roller so that the rollers cooperate to expel moisture from a commodity between them at a rate which is determined by the selected position of the lever. The first roller can be driven to move a commodity between the rollers upwardly, and springs are provided to pull the second roller away from the first roller.

Abstract: A control arrangement for translating substantially linear motion includes a control device, a controlled device, and a mechanical link interconnected between said control device and said controlled device. The mechanical link comprises a spring strip having an arcuate cross section. The control device comprises an arrangement for moving the strip substantially linearly in a given direction at the control device. The control arrangement further comprises at least one guide arrangement for bending the strip in at least one region between the control device and controlled device, to extend in a direction other than the given direction. The strip extends without support by lateral forces in at least one region between the control device and controlled device.

Abstract: A head protection or helmet suspension is shown having a ratchet adjustment apparatus for the adjustment of the suspension size where the ratchet apparatus is comprised of three parts, all pre-molded of resilient plastic material and having a pre-molded spring fixed around the center of the adjustment knob to engage pins in the ratchet case to lock the suspension size in position. The assembly has no metal parts and is therefore suitable for use around electricity and electrical apparatus.

Abstract: A control assembly for a household refrigerator having a mullion partition separating the freezer compartment and the fresh food compartment with a front face and a bottom panel forming the top of the fresh food compartment. There is a control bracket mounted on the bottom panel at the rear of the mullion partition and this bracket has a circular aperture with two radial notches. A thermostat having a rotatable stem for adjusting the thermostat setting is mounted on the control bracket. There is a rotatable hub member having a circular central portion with radial lugs slightly smaller than the circular aperture and radial notches of the control bracket. The portion of the central portion that projects through the circular aperture and radial notches is rotated to mount the hub member on the control bracket. There is an aperture in the center of the circular central portion to receive the rotatable stem of the thermostat and it is dimensioned to rotate the stem in unison with rotation of the hub member.

Abstract: Disclosed herein is a drive device designed to be detachably mounted on an existing video cassette recorder and playback machine and including a friction wheel designed to frictionally engage a channel tuning wheel already located on the machine as manufactured. The invention drive device includes a control knob constrained to rotate with the friction wheel via a shaft protruding through a housing of the device with the housing being detachably mounted on the machine with the friction wheel in frictional engagement with the existing tuning wheel.

Abstract: A fluid resistant control linkage assembly having a housing with interior and exterior sides. The control linkage has a circular groove defined in the exterior side of the housing. A ring is rotatably disposed with the groove. A handle is affixed to the ring and located outside the housing to input rotational motion to the ring. An opening is defined in the groove to provide access to the interior of the housing. An array of gear teeth or a yoke or a post is affixed to the ring at the opening.The groove may be fitted with at least one elastromeric washer which is supported by at least one concentric shoulder along said groove.

Abstract: Lifter for loads, in particular a palletizer for stackable objects, comprising a load carrier which can be moved up and down, in particular an articulated swivel arm (16) on whose free end an element is arranged for seizing the objects, the up and down or lifting and lowering movements of the load carrier being effected along a vertical guide, in particular along upright columns (19), and a drive (13)for the lifting and lowering movement of the load carrier at the upper or lower end of the vertical guide (columns 19), the connection between the drive (13) and the load carrier (swivel arm 16) being made by a toothed belt (14) which on one side is passed around a pinion (15) allocated to the drive (13) and on the other side is passed around a toothed disc (17) rotatably mounted on the end of the vertical guide (columns 19) opposite the drive side and whose free ends are each attached to the load carrier or a guide block (26) of the same.

Abstract: A boom H for a vehicle A which carries a working implement K to enable operations to be carried out such as excavation or loading, comprises first (11) and second (10) parts, the first part (11) carrying the working implement (K) and the second part (14) being mounted on a body (B) of the vehicle, the first and second parts being connected together for relative pivotal movement about a generally horizontal axis (A 1), a fluid operated actuating means (18) acting between the first (11) and second (10) boom parts to effect relative pivotal movement at least in one sense of rotation, characterized in that the fluid operated actuating means (18) comprises two relatively movable members (20,23) which operate in tension, one member (20) being pivotally secured to one of the boom parts (14) and the other member (23) being connected via a flexible linkage (24) to the other boom part (11) to enable the two boom parts to be relatively pivoted to include a smaller angle between them than would be possible with a rigid l

Abstract: A voice coil motor assembly for a voice coil motor printwheel setting apparatus comprises a plate having the voice coil motor coils mounted thereon. The plate is adapted for attachment to a printed circuit board by pins electrically connected to the voice coils. Picker links having voice coil magnets connected thereto are stacked in sequence and the final assembly is completed by enshrouding the voice coil magnets with the voice coils mounted on the plate.

Abstract: In a combustion air flow rate adjusting device in which a cylindrical regulating ring fitted about an outer peripheral surface of an inner cylinder of a gas turbine combustor is translated along the outer peripheral surface of the inner cylinder in order to vary an opening area of air intake ports formed in the peripheral wall of the inner cylinder, an arcuately moving part at a forward end of a lever fixedly connected to a forward end of a shaft extending inwardly through a peripheral wall of an outer cylinder of the gas turbine combustor is connected to a part reciprocating together with the regulating ring, by leaf springs.

Abstract: An actuating arrangement connected with throttle valves of suction pipes of an internal combustion engine which are to be actuated synchronously. The throttle valves include bearing shafts and cooperate by way of levers with a linkage of the actuating arrangement. For the compensation of tolerances of the actuating arrangement, especially angular tolerances of the throttle valves, yielding members are provided between the linkage and the bearing shafts, and a device stresses the throttle valves into the closed end positions.

Abstract: A tape-type mechanical drive including a flexible but substantially inextensible tape connected between two elements so that the tape transmits forces in tension. The tape includes a plurality of plies, disposed in two runs, and an equalizing device is provided for maintaining the plies under equal tension as the curvature of the tape changes. The plies in each run remain substantially parallel to one another. The tape may be formed from a single continuous strap folded to define a plurality of spiral turns.

Abstract: Anti-skid device of a kind that includes a chain-provided pulley that on use if brought to contact with the side of the vehicle wheel so that when the vehicle wheel is rotated the chain pieces (2) are successively thrown in between wheel and ground in order to improve the traction. The anti-skid device is rotatably journaled in an arm (7) that in turn is fastened to a housing (8) that is turnably journaled on a stub axle (9). The turning movement of the arm and the housing is achieved in one direction by a bowden wire (20) and in the other dirction by a return spring (23). The stub axle (9) of the housing (8) is fastened to a plate (10) that in turn is fastened to a tube (11) by means of welding. The tube (11) is in turn arranged in clamps (12 and 13), that in turn are fastened to the bolts holding together the vehicle axle and its spring.

Abstract: A mount is secured to an end of a cylindrical housing with a front side facing outward thereof. A knob is provided having a stem extending from one end and a gear secured to and extending radially outward from the end of the knob. An aperture is formed through the mount for receiving the stem of the knob with the knob located on the front side of the mount near one edge thereof. A generally cylindrical shaped face member has an inner side secured to the front side of the mount and an outer side facing outward thereof. The face member has an opening formed therethrough for receiving the knob and its gear such that the knob may be viewed from the opening from the outer side of the face member. The opening of the face member extends to one edge thereof such that a portion of the gear is accessable from the edge. An annular member is located around the face member and is supported by the face member for rotation in opposite directions relative to the face member.

Abstract: A single cable shift assembly includes a casing (30) mounted to a surface adjacent the pull-pull cables (14, 16) of a shift/throttle control linkage. A pair of pulleys (34, 36) direct cables (14, 16) in opposite directions. A slide (38) within casing (30) includes anchors (40, 42) for securing the cable ends to spaced positions along the longitudinal axis of the slide. The slide is provided with a connector pin (44) that secures the control cable (48) to the slide and translates linear movement of the control cable into linear movement of the slide.

Abstract: Apparatus for transporting flat objects having first and second faces between a first carrier and a second carrier, the apparatus comprising a mechanism for supporting the first and second carriers, a pickup mechanism for picking up the objects and transporting the objects between the first carrier and the second carrier, and intermediate station having a mechanism for receiving the objects from the pickup mechanism with the faces in a first orientation and for changing the orientation of the faces before the objects are removed by the pickup mechanism.

Abstract: A rotary mechanism for converting a reciprocal linear motion into an oscillating rotary motion with increased torque at the end positions. Two pressurized air cylinders 1,2 co-operate via links 14, 15 with a common lever arm 5 fastened to an output shaft. The cylinders provide an increased torque adjacent to each one of the end positions of the rotary motion.

Abstract: The invention relates to a readjustment device on coking oven batteries with linkages, disposed in a master gallery so as to be movable in the longitudinal direction of the battery, for the actuation of shutoff members on the individual ovens of the coking oven battery. The linkages, to be moved simultaneously and oppositely in the master gallery, are joined to each other at one end of the coking oven battery through a guide pulley and this guide pulley is provided with pulley segments having different radii to obtain different strokes at the linkages.

Abstract: A pump jack for reciprocating a string of rods in a well is disclosed in which a drive shaft having an axis below the axis of a guide wheel supported above the wall has a crank arm mounted to each end of the drive shaft for rotation therewith, counterweight means having a center of gravity offset from the axis of the drive shaft are mounted to each crank arm to assist in lifting the rods, and the inner ends of pitman arms are rotatably secured to the crank arms at a pivot point offset from the axis of the drive shaft. A cross bar is secured to the outer ends of the pitman arms and a flexible linkage extends over the guide wheel, this linkage having one end carried by the cross bar and the other end adapted to be secued to the string of rods, and the crank arm is constructed so that a radial from the drive shaft passing through the pivot point of the pitman arms will be substantially tangent to the top of the guide wheel when the counterweight means is at its uppermost position.

Abstract: A pumping unit for pumping fluids from a location beneath the surface of a field. The rotary motion of a crankarm is changed to a reciprocating motion of a pair of flexible members by pitman arms pivotally secured at one end to the crankarm and at the other end to the flexible members which extend from such connection over a plurality of rollers and then vertically downward toward the well head. The flexible members are connected at their other ends to means connected to the polished rod. Portions of the flexible members and the polished rod lie in the same vertical plane so that true vertical reciprocating movement is imparted to the polished rod. The flexible members comprise non-metallic straps having a substantial width to provide stability of movement.

Abstract: A tuning device has a dial drum rotatably supported in a frame, and a rheostat operatively connected to the dial drum. A knob is disposed in alignment with the dial drum. The dial drum has an outer toothing formed on the periphery thereof. A drive gear is secured to the knob, and a reduction gear train is disposed between the drive gear and the outer toothing for transmitting the rotation of the drive gear to the dial drum.