Abstract: An articulated compliance mechanism for use with a support structure includes a carriage and a pair of parallel four-bar linkage arrangements. The arrangements collectively have a first set of links configured to rigidly connect to the support structure, a second set of links rotatably coupled to the carriage a distance from the first set of links, and a third set of links rotatably coupled to and spanning the distance. The compliance mechanism supports and provides the carriage, e.g., a rectangular shaped frame, with a stable equilibrium point using a gravitational restoring force, and provides the carriage with a passive translational degree of freedom along a horizontal axis in response to an input force from an operator. An additional compliance mechanism may be serially connected to provide a passive translational degree of freedom along a vertical axis. A system includes the compliance mechanism and support structure.

Abstract: Disclosed are a digitized automatic control method for oil-pumping and a digitized balance-shifting pumpjack, said pumpjack comprising a main motor (15), a decelerator (8), a crank (9), a connecting rod (6), a walking walking beam (3), a balance arm (7), a derrick (5), a horsehead (2), a substructure (12), brake device (13), a beam hanger (1), a load sensor (17), a stroke process measurer, a safety stop device, and a digitized control box (14). A movable counterweight box (28) moves leftward and rightward on the balance arm (7), automatically balancing load at the suspension center in various operating conditions, and pumpjack's frequency of stroke is automatically adjusted according to variations in pump fullness. Features include safety and reliability, convenience of operation, enhanced oil well production, balance rates, energy conservation and consumption reduction.

Abstract: The invention discloses a folding and unfolding mechanism. The folding and unfolding mechanism is mounted between an upper panel and a lower panel which are hinged, and is used for folding and unfolding the upper panel and the lower panel, and for overturning for 0-180 degrees between the upper panel and the lower panel; wherein the folding and unfolding mechanism comprises a four-connecting-rod assembly, a pushrod assembly and an auxiliary connecting rod assembly; the auxiliary connecting rod assembly comprises a first auxiliary connecting rod and a second auxiliary connecting rod, wherein one end of the first auxiliary connecting rod is hinged to one end of the second auxiliary connecting rod; the other end of the first auxiliary connecting rod is hinged to the lower panel; and the other end of the second auxiliary connecting rod is fixedly connected with a fourth connecting rod.

Abstract: A transition element between a jacket having four legs and a tower where the lower portion of the tower is fixed to a torsion plate that is connected to an upper portion of the legs. A brace extends from each leg. Each brace includes a strut. The strut has a first end portion and a second end portion. The strut is fixed to the upper portion of each leg and a plate that is fixed to the tower at a contact portion above the torsion plate. The planar plate is fixed to the tower in the circumferential direction and has a common axis of symmetry with the strut. The plate is fixed to the first end portion of the strut.

Abstract: A surgical instrument including housing having a shaft extending distally therefrom, an outer sleeve disposed about the shaft and selectively translatable relative to the shaft, a first drive shaft disposed within the shaft and translatable relative to the shaft independently of the outer sleeve, a second drive shaft disposed within the first drive shaft and coupled to the outer sleeve to translate in conjunction with the outer sleeve, and a rotatable nose wheel. The rotatable nose wheel is mounted about a distal end of the housing and is rotatably coupled to each of the outer sleeve, the shaft, the first drive shaft, and the second drive shaft such that rotation of the rotatable nose wheel effects corresponding rotation of the outer sleeve, the shaft, the first drive shaft, and the second drive shaft in conjunction with one another and relative to the housing.

Abstract: The invention relates to a device (50) for manually unlocking a holding mechanism (10) to which a load can be applied, comprising an operating element (62) which is to be operated manually for unlocking the holding mechanism (10) with an operating force becoming larger as the load increases, a conversion mechanism (64, 90) which includes a force transfer element (72) coupled to the operating element (62), and a trigger (66) coupled to the force transfer element (72), wherein in order to unlock the holding mechanism (10) the trigger is movable by the operating force transferred by the force transfer element (72) to the trigger (66) from a locked position in which the trigger (66) is operatively decoupled from the holding mechanism into an unlocked position in which the trigger (66) is operatively coupled to the holding mechanism in order to unlock said holding mechanism.

Abstract: In a valve drive apparatus, which drives a first valve and a second valve of a supercharger, a first rod is rotatably connected to a first valve lever shaft at one end part thereof to drive the first valve and is connected to a shaft at the other end part thereof, and a second rod is rotatably connected to a second valve lever shaft at one end part thereof to drive the second valve and is connected to a second member at the other end part thereof. A spring is placed between a first engaging part of the first member and a second engaging part of the second member and urges the first member and the second member to urge a first contact part of the first member and a second contact part of the second member toward each other.

Abstract: A thumb actuator for a no-link type thumb assembly includes a cylinder body configured to be pivotally connected to a mounting bracket. The thumb actuator further includes a piston assembly having a piston and a piston rod configured to be pivotally connected to a thumb. Further, a ratio of a retracted length to a stroke length of the thumb actuator is in a range of about 1.9 to 2.2.

Abstract: In a further embodiment, a method of controlling a base assembly can be provided. An actuation member can be pumped to deploy one or more wheels to lift a base assembly on said wheels. Further, a pin can be received in a holding portion on a semi-planar contoured surface in response to the pumping of the actuation member. The wheels can be held in a deployed position via the pin being held in the holding portion. Further pumping of the actuation member can separate the pin from the holding portion and retract the wheels from the deployed position.

Abstract: A sensor device for a pedal which is set up to determine at least one actuating variable regarding an operation of the pedal by a user of a device which is actuable by means of the pedal, and to output information corresponding to the at least one determined actuating variable, the sensor device additionally being set up to determine as the at least one actuating variable, at least one variable regarding a position and/or a change in position of an input rod disposed on the pedal, which is able to be set into at least a rotary motion by operating the pedal, in relation to a specified spatial direction. Furthermore, a method for providing information regarding an operation of a pedal is described.

Abstract: A method and apparatus is provided, including an actuator system that may be connected to a wing frame for controlling an active element. The actuator system may include sliding elements movable along an axis parallel to the span-wise axis of the wing. The sliding elements may be connected to fixed elements and a crank element, the crank element generally comprising a beam element and a pivot element. The beam element may be offset from the pivot element so that the crank element is rotatable about the pivot element with a negative stiffness under an external force that tends to pull the sliding elements away from the fixed elements.

Abstract: A sliding assembly includes a main body, a sliding element, a first elastic device and a second elastic device. The sliding element can slide relative to the main body in a first direction and a second direction. The first elastic device is rotatably fixed to the sliding element, the first elastic device providing a first elastic force driving the sliding element to slide relative to the main body in the first direction and the second direction. The second elastic device provides a second elastic force to lock the sliding element at different states.

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: An actuator assembly for remote actuation of control panel components in an environment that restricts human access is contemplated. The actuator assembly includes one or more remotely controllable linear drive mechanisms for imparting a rotation motion on one or more cams to remotely press a control panel component such as a button or switch. While disengaged, the cams are rotated to a position where they minimally obstruct an operator's view. The actuator assembly also allows the force and throw of actuation to be accurately controlled.

Abstract: The invention relates to an actuation device for a brake (40, 41, 42, 43, 50), for applying an output force (FA) to means (40, 41, 42, 43, 50) which generate braking force, depending on an input parameter (FE), comprising a lever (1) and a force generator (7) which brings a force (FFeder) to bear on the lever (1) at an effective angle (?), relative to the longitudinal axis of the lever (1). Furthermore, an alternative actuating device for a brake is given, which permits a significant reduction of the power and energy requirements relative to direct-acting actuating devices. The above is achieved by means of a low-friction actuation characteristic as a result of the construction features of the actuating device and/or the selection of materials used. A preferred field of application is in electrically-driven braking systems on commercial vehicles.

Abstract: A lifting device is provided for a two-leaf folding flap whose upper leaf is hinged to a top wall or partition wall of a carcass around a horizontal first axis and whose lower leaf is pivotally connected to the upper leaf around a second axis parallel to the first axis. The lifting device has at least one two-armed lever which is pivotally mounted to a side carcass part around a horizontal pivot axis and whose longer arm is hingedly connected to the lower leaf, and at least one hinge arm which hingedly connects the leaves and is respectively fastened in hinge cups arranged in the leaves. The hinge arm is adjustable with respect to a hinge cup via a first eccentric device in one direction and via a second eccentric device in another direction perpendicular to the first direction.

Abstract: The invention relates to a drive device for a windshield wiper device for moving an output shaft (32), having an input shaft (12) which can be driven through a motor (10) and which is connected to a linear motion element (20) in a rotationally fixed manner, wherein the linear motion element (20) is connected to the output shaft (32) through exactly one coupler (24) and exactly one rocker (28), wherein the coupler (24) is supported between the linear motion element (20) and the rocker (28) in an articulated manner and the rocker (28) is connected to the output shaft (32) in a rotationally fixed manner. In said manner, large forces can be transmitted using self-locking in a small design.

Abstract: Methods and apparatus are provided for reducing the space required by a switch assembly input component of an electronic device. The input component may include a track and a button capable of linear movement within the track. The input component may also include a disk having a slot and a plurality of labels. A pin may be coupled to the button and may extend into the slot for translating the linear movement of the button into rotational movement of the disk. The rotational movement of the disk may alter the portion the labels that are exposed to a user under an open portion of the track. The input component may also include a switch coupled to a portion of the pin extending through the slot of the disk. A switch arm may move along a switch path of the switch in response to the linear movement of the button.

Abstract: An actuator assembly for remote actuation of control panel components in an environment that restricts human access is contemplated. The actuator assembly includes one or more remotely controllable linear drive mechanisms for imparting a rotation motion on one or more cams to remotely press a control panel component such as a button or switch. While disengaged, the cams are rotated to a position where they minimally obstruct an operator's view. The actuator assembly also allows the force and throw of actuation to be accurately controlled.

Abstract: A six-bar linkage mechanism for conforming to the configuration of a tractored surface having a central link defined by a tool body and a saddle link spaced from the central link and movable for conforming with the tractored surface. A pair of front links each having pivotal connection with respective ends of the saddle link and having linearly movable pivotal connection with the central link to permit angular and spacing changes of the saddle link relative to the central link. A pair of centralizer links are located between the front links and have pivotal connections with the saddle link and pivotal connections with the central link. One of the pivotal connections is linearly movable on the central link. For tractor tools, when the tractored surface is a wellbore or well pipe, a plurality of six-bar linkages radiate from a tool body for surface conforming traction with the tractored surface.

Abstract: A surface-transformation method of forming regions of a second material in a first solid material to control the properties of the first solid material is disclosed. The regions of the second material are formed in the first solid material by drilling holes to a predefined depth and at a predefined lattice position. The holes in the first solid material are then filled with a second material and then the first and second materials are heated to a temperature close to the melting point of the first solid material to spontaneously form the regions filled with the second material and embedded in the first solid material at the desired location. A liquid-phase immersion method or a deposition method may be employed to fill the holes in the first solid material.

Abstract: An apparatus and method for reducing the number of programming states (threshold voltage levels) required to be traversed when programming a multistate memory cell with a given set of data. The invention first determines the average programming state (corresponding to an average threshold voltage level) for the set of data which is to be programmed into the memory cells. This is accomplished by counting the number of programming states which must be traversed in programming the cells with the data. If the majority of the data requires programming the memory cell(s) to the upper two programming states (in the case of a two bit per cell or four state system), then the data is inverted and stored in the memory in the inverted form. This reduces the amount of programming time, the number of programming states traversed, and the power consumed in programming the memory cell(s) with the data field.

Abstract: A carton closure system including a cam having a rear face and a camming surface opposite the rear face, the cam being mounted for linear reciprocation between a position wherein there is applied pressure against partially infolded portions of the end side walls of a carton blank to effect a sealing pressure against such infolded portions and a position wherein no material pressure is applied to the partially infolded end side walls of the carton blank, the movement between such pressure and non-pressure applied positions being facilitated by means of a multi-faceted geometry of the camming face of the cam.

Abstract: Mechanism for obtaining a couple for maneuvering a part to make it rotate on itself through a quarter turn, from a member moving along a trajectory, via a transmission such that the curve representing the reduction coefficient, which is the ratio of the maneuvering couple to a nominal couple, shown on the y axis, as a function of the angle of rotation, shown on the x axis, is convex, the curve rotating its convexity upwards and the peak coefficient of reduction being obtained for an angle of about 20 to 40°.

Abstract: A device and a method for moving an object are based on the fact that the object (8) is pivotable in relation to a base portion (7) about an axis. There is an arrangement (18) for displacing, during pivoting motion of the object, the object substantially parallel to its pivoting plane for the purpose of causing a point of the object to describe a motion in substantially one and the same plane as a consequence of the combined pivoting/displacing.

Abstract: A shower pipe assembly useable in the papermaking process includes a shower pipe, including structure for oscillating the shower pipe along an axial path and a base. Oscillating support structure couple the base to the shower pipe and supports the shower pipe wherein oscillation of the shower pipe is constrained along a straight line path. The assembly further includes a first arm rotatable about a first axis being stationary relative to the base during rotation of the first arm. A second arm is rotatable about a second axis extending through the first arm such that the distance between the first axis and second axis remains constant. The second arm should be of a length relative to the distance between the first and second axis to produce a straight line motion at a particular location of the second arm upon rotation of the second arm about the second axis a constant distance per degree of rotation of the first arm about the first axis.

Abstract: A straight line motion producing apparatus useable in the papermaking process includes a base, a first arm rotatable about a first axis being stationary relative to the base during rotation of the first arm. A second arm is rotatable about a second axis extending through the first arm such that the distance between the first axis and second axis remains constant. The second arm should be of a length relative to the distance between the first and second axis to produce a straight line motion at a particular location of the second arm upon rotation of the second arm about the second axis a constant distance per degree of rotation of the first arm about the first axis. The apparatus further includes a mechanism for rotating the second arm about the second axis a constant distance per degree of rotation of the first arm about the first axis to produce a straight line motion at a particular location on the second arm.

Abstract: A support linkage apparatus assembly provides a balanced extension and retraction of supported elements with useful inclination. The supported element comprises the coupler link element mass and is prepositioned between parallel linkage apparatuses. The support linkage apparatus assembly provides prepositioned support of elective elements. A display rack assembly provides storage and display of paper and materials of negligable mass. A drawer assembly provides cradled storage and a balanced opening and closing inclination of various supplies of three dimensional mass. A container assembly provides a balanced opening and closing inclination of various supplies of three dimensional mass.

Abstract: An examination table has a patient support plate attached to a floor stand so as to be movable relative to the floor stand in the longitudinal direction of the support plate. The support plate is generally rectangular, and has one side which is longer than the other. The support plate is moved relative to the floor stand by a motorized articulated lever, having first and second arms. Respective ends of the two arms are joined so as to be rotatable around a second shaft, and an opposite end of the first arm is rotatable around a first shaft connected to the support plate, and an opposite end of the second arm is rotatable around a third shaft attached to the floor stand. All three shafts are oriented perpendicularly to a horizontal plane in which the support plate is disposed, so that the first and second arms always move in a plane parallel to this horizontal plane.

Abstract: A single powered dual movement motion device preferably mounted on the distal end of a boom and connected to a platform adapted to carry a wheel chair of a handicapped person. The motion device has a base frame that mounts it on the boom. A first extension frame is pivotally connected to the base frame and a second extension frame is hingedly connected to the first extension frame. A reversible rotatable drive assembly is fixed to the base frame and is driven by a reversible power source. The reversible rotatable drive assembly includes a release and lock means whereby an arcuate path will be given to an extremity of the second extension frame in the release mode and a straight forward path in the locked mode. A reversal of the power source will reverse the sequence of events.

Abstract: The apparatus includes a static base, a platform, a first arm assembly, and a second arm assembly. The first arm assembly has a first terminal portion pivotally connected at a first pivot point to a first portion of the static base and a second terminal portion pivotally connected to the platform at a second pivot point. The first arm assembly is so constructed to permit changes in the distance between the first and second pivot points, but is concomitantly constrained to movement in a desired first plane. The second arm assembly has a respective first terminal portion pivotally connected at a third pivot point to a second portion of the static base and a respective second terminal portion pivotally connected to the platform at a fourth pivot point. The second arm assembly is so constructed to permit changes in the distance between the third and fourth pivot points but is constrained to movement in a desired second plane which is angularly disposed from the first plane.

Abstract: An articulated robot arm or the like comprising a base, an upper arm which is pivotally secured to the base at a shoulder joint, a lower arm pivotally secured to the upper arm at an elbow joint, and optionally a "hand" or tool support pivotally secured to the lower arm at a wrist joint. A parallelogram linkage controls the relative position of the upper arm, lower arm, and base. The linkage has first, second, third, and fourth links joined by pivots. The first link is a crank which is pivotally connected to the base by a first pivot which is coaxial with the shoulder pivot. The second link of the parallelogram linkage is parallel to the crank link, and is fixed with respect to the lower arm. The third and fourth links join the first and second links to complete the parallelogram. At least one of the third and fourth links is fixed to the upper arm.

Abstract: A hand controller which includes a hand grip having therein a mechanism for allowing truly linear motion along at least two axes by modifying a four-bar linkage with a second four-bar linkage to counteract any rotational motion that would otherwise occur.

Abstract: A control device for a tiltable mounting head, such as the mounting head for a camera, includes a pantographic-type linkage. The angular position of an arm (24) supporting the mounting head (26) is controlled relative to a locating arm (12), whose remote end is pivoted to fixed structure (16) by three meshing gears, of which one (10) is connected to the locating arm (12) and another gear (20) is connected to the arm (24). The gears are rotatably mounted on a rigid arm (22) of the linkage of which an intermediate point (28) is constrained to move along a horizontal path.

Abstract: The known mill roll stand in a feeding apparatus of a rolled sheet of the type including at least one pair of arms having rolling centers at their tip ends and constructed so as to be swingable about an arm shaft at their base ends and so as to be movable along the arm shaft to approach to or separate from each other, is improved so that when the rolling centers are raised by swinging up the arms so as to meet with sheet rolls having different roll diameters, the rolling centers may be raised along a vertical straight line locus rather than an arc-shaped locus. The improvements reside in that the opposite ends of the arm shaft are eccentrically and pivotably supported from rotary supports on a frame of the mill roll stand, and that there is provided converter mechanism for converting the swinging locus of the rolling center into a locus along a vertical straight line.

Abstract: A control mechanism for a machine element of the type including a fixed part and a movable part movable between two limit positions, e.g. an automotive vehicle clutch. A spring biasses the movable part to one of its limit positions. The control mechanism comprises a linkage for controlling the displacement of the movable part between its limit positions. A motor drives the linkage, and a resilient device is coupled to the linkage for reducing the force applied by the motor for displacing the movable part between its limit positions.

Abstract: An implement floating frame hinge assembly is provided for accommodating the folding of pivotally connected first and second frame sections wherein a first lever is pivotally connected to the first frame section, a second lever is connected between the second frame section and the first lever, an an extendable and retractable actuator is pivotally connected between the first frame section and the second lever. The assembly includes a connection of the second lever to the second frame section about a pivot axis fixed relative to the second frame section. A pin is moveable with the second lever at a fixed distance from the pivot axis of the connection between the second frame section and the second lever.

Abstract: A parallel translation mechanism, when connected between a first element and a second element, maintains the relative direction between the two elements constant when one of those elements is moved relative to the other. The mechanism is in part formed by first and second rigid elongated members which are pivotally connected together and are pivotally connected by the end of the first elongated member to one of the elements. A first portion of an extendable member is connected between the one of the elements and the second elongated member, and a second portion is connected between the other element and the second elongated member. The other element is also pivotally connected to a position on the second elongated member. The three members of the mechanism are connected together in such a fashion that the described relative movement between the two elements is obtained. The mechanism has particular application to forklift vehicles.

Abstract: A reach mechanism for use on a material handling device having a load support carriage such as an industrial lift truck and a load carrier. The reach mechanism has a rear mount attachable to the carriage, a front mount for supporting lift forks or the like, and an extensible linkage for longitudinal projection and retraction of the front mount relative to the rear mount. The linkage includes two laterally spaced set of links, each set having a first pair of upper and lower links pivoted at the lower ends thereof to the rear mount at spaced points and a second pair of upper and lower links pivoted at the lower ends thereof to the front mount at spaced points. The upper end of each of the first and second pair upper links are pivotally connected to the upper end of the second and first pair lower links respectively. Hydraulic power rams actuate the links to project and retract the front mount.

Abstract: In a fork-lift truck comprising a wheeled structure carrying a lifting arm with a first part articulated at its rear end to the structure and a second part projecting downwardly from the front end of the first part and carrying a forked loading platform, and a jack for raising and lowering the arm, the lifting arm is supported by the wheeled structure so as to be orientable about a substantially vertical axis and two adjacent caliper units located in a general V configuration are provided to move the forked platform linearly relative to the lifting arm. Each caliper unit includes two plates having one mutual hinged articulation end and opposite articulation ends respectively hinged to the second part of the lifting arm and to the forked platform, the hinged articulations of the caliper units having respective axes which diverge downwardly and are substantially perpendicular to each other. Actuators are interposed between the two plates of each caliper unit for opening and closing them simultaneously.

Abstract: A system for transferring workpieces generally vertically from a station at one height in a workpiece support or transfer device to a station at another height in another transfer device or support. The workpiece is moved vertically by an elevator which travels along a path through the stations from a point below the lower station to a point above the upper station. To smoothly and rapidly move the workpiece the elevator is accelerated and decelerated and dwells at least when picking up and depositing a workpiece. To avoid collisions, interference and the necessity of precisely synchronizing movement of the transfer and elevator, when in its fully raised and lowered positions, the elevator is clear of and does not interfere with the transfer and supports and any workpieces in the stations.

Abstract: A transport mechanism for silicon wafers comprises an elongate four arm linkage and a wafer support arm which is secured to the linkage through a gearing system. One of the short arms of the linkage is fixed, and as the linkage is rotated, the gearing system produces a different motion in the support arm. Preferably pinion gears are secured to the ends of the long arms and engage a pinion gear secured to one end of the support arm, so as to produce linear motion of a wafer placed on the support arm.

Abstract: An improved straight line motion gate mechanism which translates gate position to an open/closed position without any perceptible vertical motion and without any moving contact with either the ground or the use of a track. The gate may assume a wide range of widths and the mechanism may be self locking in the closed and open positions. A very small vertical motion of the mechanism provides for minimal input energy requirements and is relatively insensitive to gate weight.

Abstract: The mechanism comprises a movable part having one main point actuated by a crank, another main point guided along a slide having a desired profile, and a driven point which follows a desired path, depending upon the path of the two main points. A driven member is articulated to the movable member about the driven point. Moreover, the driven member is guided with respect to the crank along a path which is in a certain similarity with respect to the path of said other main point. The driven member moves parallel to itself when the crank is actuated.

Abstract: An operating arm for earth-moving or foundation machines consisting of an upper and a lower arm pivotally connected via a device for equal angular movement for guidance of various tools on a straight-line force path of great length. The direction of this path is variable by means of a force control basic guide lever. If said basic lever is turned during the straight-line movement, superimposing the two movements cause curving of the forced path. If rapid return is provided, excavation may be performed in either one or the other direction and a drilling or ramming tool may be raised or lowered with higher force. Rotation into a load carrying position is provided for excavator buckets.

Abstract: A powered closure mechanism for moving a tailgate from an open position to a closed position comprises a reciprocating drive mechanism mounted on the tailgate and a power transmission which connects the reciprocating drive to the tailgate so that it will rotate the tailgate between an open and closed position in response to operation of the reciprocating drive mechanism.

Abstract: The support apparatus in the form of a stand possesses an arm component projecting transversely from a stand component. A surgical operating microscope is arranged at the end of the arm component. A guide linkage with a double scissors type carrier linkage whose movement is combined with an extension movement is provided for the displacement of the operating microscope in a direction transverse to the stand component. This extension movement is controlled by a control linkage in such a way that the upper end of the carrier linkage which carries the stand arm component moves along a straight line. There is thus no need for a counterweight for the transverse movement of the operating microscope over a surgical operating table. A first counterweight for the upwardly and downwardly directed swinging movement of the stand arm component is enclosed in a space saving manner within a housing of the stand component, conjointly with a substantial portion of the guide linkage.

Abstract: A toy device is disclosed which can be opened at any angle desired by means of a mechanical structure, which comprises mainly a fixed member with two notches being furnished at both ends respectively; two movable members, of which the bottom ends are fixed respectively to two transmission members being mounted in the notches on the fixed member; a control member, of which two lugs on both ends thereof are hooked in the two round holes of the two transmission members respectively so as to have the control member coupled with the two movable members. When the control member is being driven to move upwards, the movable members will be moved to open at a given angle or fully open at an angle of 180.degree..

Abstract: The walking beam of a pumping unit is suspended from an oscillating hanger arm. It is pivoted at one end to a crank and to a link, the other end of the latter being pivoted to a fixed position shaft. At the other end of the walking beam is a point which follows a virtually rectilinear path between a bottom dead center position and a top dead center position. This point may therefore be coupled through a rigid member to an oil well pump sucker rod line.

Abstract: A multiple station conveyor having a lift and carry shuttle to advance workpieces. To permit a normal work height for the workpieces when in the stations while providing a relatively long vertical stroke for the shuttle it is raised and lowered by Scott Russell lift mechanisms disposed beside and laterally outside of the shuttle.