Abstract: A scissor lift comprises a load support, a lift support and at least one scissor assembly defined between the load support and the lift support, the at least one scissor assembly being driven into an open or a closed position by a drive device that enables movement of the load support relative to the lift support with the opening and closing of the at least one scissor assembly, wherein the at least one scissor assembly is further defined by a pair of arms attached at a pivot, and where the pair of arms further comprises a curved outer surface that engages a portion of a drive device for urging the scissor arms apart and for moving the load support relative to the lift support.

Abstract: A pressurized underground enclosure includes a battery venting system having a battery within a battery box in a sealed enclosure. A first pipe is fluidly connected to the battery box and an ambient atmosphere and includes a vacuum generator for reducing a pressure in the battery box. A second pipe is fluidly connected to the battery box and the ambient atmosphere and includes a one-way valve permitting airflow to the battery box and precluding airflow from the battery box to the ambient atmosphere. The enclosure includes a scissors lift including scissor linkage units having arms pivotally connected at terminal ends and at central positions. The scissor linkage units are moveable from a retracted to an extended position by pneumatic cylinders. The internal pressurization of the enclosure is selectively released and locking mechanisms are retracted before a rack of the scissors lift is extended through an opening of the enclosure.

Abstract: A system for monitoring and/or controlling equipment in a hazardous area can include at least one sensor disposed within the hazardous area. Each sensor can be non-electrical and can be adapted to interact with the equipment and generate at least a first sensor output and second sensor output. The first sensor output can be indicative of a first equipment state and a second sensor output can be indicative of a second equipment state. The system can also include at least one converter disposed outside the hazardous area. Each converter can be in communication with at least one of the sensors. Each converter can be configured to receive the first and second sensor output and generate a converter output signal based on at least one of the first and second sensor outputs.

Abstract: Example methods, apparatus, system, and articles of manufacture for releasably locking components that are moveable relative to one another are disclosed herein. A disclosed example locking apparatus includes a locking device mountable to a first component and including at least one locking member. The example system also includes a catch member mountable to a second component. The catch member has a plurality of substantially similarly formed catches. The locking member is engageable with at least one catch in a plurality of predetermined catching positions in at least one of a releasable, form-locking manner or a releasable, force-locking manner. The example system also includes a force member to produce a relative movement between the locking member and the at least one catch. In at least a partial region of the catch member, at least a first catching position, a second catching position and a third catching position are traversable by the locking member.

Abstract: A laboratory jack having a scissors-type jack assembly connected to upper and lower platforms includes guide members and thrust bearings or rollers, which provide improved stability across a longer stroke than previous laboratory jacks. One laboratory jack includes upper and lower tiers of scissor assemblies comprised of scissor arms and guide rods disposed between the ends of each of the upper and lower scissor assemblies. The guide rods are carried by cross-brace members that are connected to and extend between opposing portions of the scissor assemblies, and the guide rods slide through a through bore in at least one of the cross-brace members. The scissor assemblies include rollers at the interface between laterally shifting ends of the scissor arms and an adjacent platform.

Abstract: Disclosed herein are a universal platform and an assembly method of an aircraft using the same. The universal platform includes a plurality of scissor lifts arranged around an aircraft, wherein each of the plural scissor lifts includes a base frame, a support frame located above the base frame, a support table fixedly coupled to an upper portion of the support frame, a plurality of link members axially assembled to be mutually pivoted between the support frame and the base frame, a plurality of hydraulic cylinders coupled to the respective link members and the base frame so as to lift the support frame in upward and downward directions, and a slide member slidably coupled to the support table, and the slide member slides from the support table toward the aircraft so as to allow a worker to work according to height, and there is provided the assembly method of the aircraft using the universal platform, thereby contributing to improvement in productivity and in health of workers.

Abstract: A lift assembly includes a base and a platform at a relatively greater distance from the base in an extended state than in a contracted state. The lift assembly includes a pair of scissor arms with each arm having opposed first and second ends, and pivotably connected to each other about a central axis. The lift assembly includes a drive screw mechanism including a shaft defining a longitudinal axis, and further includes a drive motor, a block, and a collar. The lift assembly further includes first and second pairs of links. Each link has opposed first and second ends and an edge facing away from the central axis and defining a recess in the link. The collar and block are spaced from the central axis and indirectly coupled to the pair of scissor arms through a pair of links.

Abstract: A belt-driven transportation system including a first set of pulleys rotatably attached to a first member and a second set of pulleys rotatably attached to a second member. The first and second members have relative movement to each other. The system further includes a unitary belt that is guided through a path defined by the first and second sets of pulleys. A plurality of flange members maintain a proper positioning of the belt on the pulleys.

Abstract: Embodiments of a scissor lifting platform comprising at least two crossing lower scissor bars, at least two crossing upper scissor bars articulatedly connected to the lower scissor bars, and a lower joint connecting the two lower scissor bars with each other and an upper joint connecting the two upper scissor bars with each other. Furthermore, the scissor lifting platform comprises at least one lifting aggregate connected to the lower scissor bar or the upper scissor bar and at least one rail having at least one contact area and being supported on the upper scissor bars. The upper scissor bar is articulatedly connected to the at least one rail and the other one of the upper scissor bars is guided by the at least one rail so as to be movable in a longitudinal direction when the scissor lifting platform moves.

Abstract: A belt-driven transportation system including a first set of pulleys rotatably attached to a first member and a second set of pulleys rotatably attached to a second member. The first and second members have relative movement to each other. The system further includes a unitary belt that is guided through a path defined by the first and second sets of pulleys with the path substantially lying in a stationary plane, and a plurality of retention rollers. A retention roller is disposed adjacent each pulley, with the belt extending about the pulley and between the pulley and the retention roller. The positioning of the belt substantially on the path is maintained by the plurality of retention rollers, and the first and second members are moved relative to each other with changes in the length of the path.

Abstract: According to the invention, a scissor lift table is hereby proposed having a base unit and a carrier unit adjustable relative to the base unit by means of a scissor unit provided with a drive unit. A safety device of the scissor lift table comprises a monitoring element, which registers parameters of a motor, and a safety element, which processes safety-related signals. The safety device additionally comprises a drive control and a drive brake, wherein the drive control acts on the drive brake in the event of a disruption.

Abstract: The present invention is a jack assembly having a first and second upper bracket pivotally connected to a support member and each having at least one strengthening bead and at least one rolled edge. A first lower bracket is pivotally connected to the first upper bracket using a non-threaded trunnion and a bearing through which a threaded rod extends. A second lower bracket is pivotally connected to the second upper bracket using a threaded trunnion through which the threaded rod also extends. The brackets are tapered for strength. The first and second lower brackets are pivotally connected to a base having an enclosed keyhole orifice for storage of the jack assembly. At least one strengthening flange is formed in both the first and second lower bracket.

Abstract: A jack assembly including a base for contacting a support surface and a shaft having a first end coupled to the base and a second end, wherein the shaft includes a power screw disposed therein; and a coupling head pivotally coupled to the second end of the shaft, wherein the coupling head is adapted to be coupled to an object to be lifted.

Abstract: Disclosed is a scissor lift including a bottom frame a top frame, a scissor mechanism arranged between the bottom frame and the top frame to displace the bottom frame and the top frame in relation to each other by means of the force provided by a linear actuator, a gearing arranged between the scissor mechanism and the linear actuator, where the linear actuator has a linear actuator point of attack at one end of a lever arm of the gearing, wherein the bottom frame is connected to a bottom frame point of attack at another end of the lever arm and wherein the scissor mechanism is connected to the lever arm through a lever arm pivotal joint arranged between the linear actuator point of attack and the bottom frame point of attack.

Abstract: A lifting apparatus is provided having an elongated support member and an elongated lift member pivotably coupled together to move between a retracted configuration in which a distal end of the lift member is near a base end of the support member and an expanded configuration in which the distal end of the lift member is remote from the base end of the support member to support a load in an elevated position. A biasing device is coupled between the support member and the lift member to selectively move the lifting apparatus between the retracted configuration and the expanded configuration, a first end of the biasing device pivotably coupled to the base end of the support member and a second end of the biasing device pivotably coupled to the lift member. A base may be pivotably coupled to the support member to engage the ground surface during lifting operations.

Abstract: One disclosed lifting apparatus includes a base, a receiving portion, first and second arms, and a support. The base has a proximal end, a distal end, and first and second opposed sides. The first side has a plurality of receiving areas spaced apart between the proximal and distal ends. The arms are rotatably coupled to the base for movement between lowered and raised positions, and are coupled to the receiving portion. The receiving portion is relatively near the base distal end when the first and second arms are at the lowered position, and the receiving portion is relatively distant to the base distal end when the first and second arms are at the raised position. The support rotatably extends from the first arm and automatically engages at least one of the receiving areas when the first and second arms move from the lowered position to the raised position.

Abstract: A scissor car jack includes a spindle, a base, a support head, a cross-member, and a spindle support with a threaded bore for holding the spindle. The base and support head are rotatably connected to the crossmember and the spindle support by way of a respective support arm, and wherein the support arms are connected with one another in the area of the base and the support head and/or in the area of the crossmember and the spindle support, and the spindle is coupled to the crossmember and the spindle support so that when the spindle is rotated, the distance between the spindle support and the crossmember can be changed. The length of the support arms can be changed telescopically and can be locked in the extended state by way of locking pins so that the scissor jack can be collapsed into a smaller volume, in particular for purposes of stowage.

Abstract: The various embodiments herein provide a jack assembly for raising and lowering the vehicles. The assembly comprises a base sheet mounted with two lower arms, a retentive sheet mounted with two upper arms and two shafts. The two upper arms are pivotably connected to the lower arms respectively through the two shafts. A wire rope is passed over a groove provided on a plurality of pulleys rotatably mounted on one of the two shafts. A spanner and a jack handle are provided respectively on the two shafts. When the jack handle is pulled up, the two ends of wire ropes move towards each other to make the two shafts to approach towards each other thereby displacing the lower arms and upper arms to lift the retentive sheet for raising the vehicles with a single pull movement of the jack handle.

Abstract: A preferred embodiment of a system includes a lifting device for lifting a motor vehicle, a support structure for mounting the lifting device in a pit, and a carriage for supporting the lifting device from the support structure and being movable within the support structure. The system also includes a cover coupled to opposite sides of the carriage so that the cover extends away from the carriage and continuously between the opposite sides of the carriage.

Abstract: A scissor jack assembly may have a base member for resting the jack assembly against a supporting surface and a support bracket assembly. First and second lower arm members may each be of an open channel construction with a width extending between a pair of outer sidewalls. One end of each lower arm member may be connected to the base plate. First and second upper arm members may each be of an open channel construction having a width extending between a pair of outer sidewalls. One end of each outer one end may be connected to the support bracket assembly. First and second trunnions may connect the upper arms with the lower arms. Each of the trunnions may include a bore. A rotatable shaft member may extend into the bores of the first and second trunnions.

Abstract: A tire lift is provided for lifting and supporting a tire to facilitate the task of changing tires on a vehicle. The lifting apparatus includes a base frame, an upper frame, and a lifting assembly. The lifting assembly is coupled to and extends between the base frame and the upper frame. The lifting assembly is extendable or retractable to urge the upper frame away from the base frame or draw the upper frame towards the base frame. Support rods may extend across an open top of the upper frame to support a tire in an upright position on the upper frame.

Abstract: The invention provides a scissor lift table having a base unit (12) and a carrier unit (14) being adjustable plane-parallel relative to the base unit (12) by means of a scissor unit(16) provided with a drive device (18).

Abstract: A preferred embodiment of a system includes a lifting device for lifting a motor vehicle, a support structure for mounting the lifting device in a pit, and a carriage for supporting the lifting device from the support structure and being movable within the support structure. The system also includes a cover coupled to opposite sides of the carriage so that the cover extends away from the carriage and continuously between the opposite sides of the carriage.

Abstract: An elevation mechanism includes a platform, a base assembly, a scissor lift assembly and a sliding assembly. The base assembly includes a threaded rod having two threaded portions and two threaded members threadedly engaging with the threaded rod. Rotation directions of the two threaded portion are opposite to each other. The scissor lift assembly includes a plurality of articulated first scissor legs and a plurality of articulated second scissor legs pivotedly coupled to the respective second scissor legs. The sliding assembly includes two fixing members fixed to the platform, a sliding rod fixed between the two fixing members, and two sliding members slidablely connected to the sliding rod. The two sliding members are correspondingly pivotedly connected to the upmost first and second scissor leg. The two threaded members are pivotedly connected to the lowermost first and second scissor legs.

Abstract: The invention relates to stabilizers for use with a vehicle. The quick release coupling system entails a pair of grooved plates that can easily attach and detach with respect to one another. The top plate of the coupling system is mechanically attached to the frame of the vehicle and a bottom plate is mechanically attached to a conventional stabilizer. These grooved plates create a quick release coupling joint that facilitates attachment and removal of the stabilizers from the vehicle.

Abstract: A hydraulic control system for an aircraft landing gear system has a hydraulic pressure source connected to a hydraulic fluid pressure transmission line, and at least one hydraulic actuator for extending and/or retracting a landing gear. A supply valve and a direction valve are arranged in series along the hydraulic fluid pressure transmission line. The supply valve and direction valve are adjustable to control the hydraulic pressure supplied to the at least one hydraulic actuator. The control system also controls uplock actuators.

Abstract: A scissor jack for handling heavy duty work includes four arms hingedly arranged to provide two opposite elbows between a base and a load support, a pair of trunnions, one at each elbow connected by a threaded shaft. One end of the threaded shaft is rotatably engaged in a threaded bush anchored to one elbow on a trunnion to extend beyond the outer corner of the elbow. The jack further includes a movable brace comprising a block slidable on the threaded shaft and carried between a pair of plates which are pivotally secured to the connectors and bent to provide stops for simultaneous location of the arms with spacers on the trunnions to determine the extended position of the jack.

Abstract: A lifting device for scissor lifts, in particular for raising motor vehicles, which during the starting phase of the lifting movement requires a reduced force for raising. The lifting device for scissor lifts includes at least two scissor arms which cross one another, a linear actuator for raising a scissor arm, a double lever joint which is pivotably mounted on a scissor arm; wherein the double lever joint couples the lifting movement of the linear actuator to at least one scissor arm.

Abstract: A tire chock having an at least partially threaded rod; a first trunnion having an aperture therethrough that receives the rod; first and second locking members, one locking member being rotatably fixed relative to the rod, the other locking member being rotatably fixed relative to the first trunnion. A tire chock may alternatively have an at least partially threaded rod; an upper trunnion rotatably attached to the rod; a lower trunnion threadedly attached to the rod, the lower trunnion translating axially relative to the rod upon rotation of the rod relative to the lower trunnion; a pair of linkage arms, the pair of linkage arms forming an X-shape, each linkage arm being connected to the lower trunnion by a drive arm and being connected to the upper trunnion by a support arm, wherein, as the rod is rotated relative to the lower trunnion, the linkage arms expand or contract.

Abstract: A laboratory jack having a scissors-type jack assembly connected to upper and lower platforms includes guide members and thrust bearings or rollers, which provide improved stability across a longer stroke than previous laboratory jacks. One laboratory jack includes upper and lower tiers of scissor assemblies comprised of scissor arms and guide rods disposed between the ends of each of the upper and lower scissor assemblies. The guide rods are carried by cross-brace members that are connected to and extend between opposing portions of the scissor assemblies, and the guide rods slide through a through bore in at least one of the cross-brace members. The scissor assemblies include rollers at the interface between laterally shifting ends of the scissor arms and an adjacent platform.

Abstract: A device is disclosed for insertion in the human or animal body in order to increase the spacing between adjacent spinous processes of the spinal column. The device comprises a plurality of shaped members which are pivotally joined to each other and arranged around a central screwed rod which is supported by a collar at one end and a threaded collar at the opposite end said collar and collar being located within the pivoting axis of the adjacent members forming each end of the device. Following insertion in the body and positioning between adjacent spinous processes the device may be deployed by rotation of the central screwed rod in order to achieve the desired separation of adjacent spinous processes while at the same time providing a secure location of the device in the deployed condition.

Abstract: A lift apparatus for lifting a structure includes a base, a bell crank pivotably coupled to the base, a coupling member for engaging a portion of the structure, pivotably coupled to the bell crank device via at least one lift member, and a longeron assembly having a pivoting apex and configured to pivot about the base. The apparatus also includes a biasing device having a first end pivotably coupled to the bell crank device for applying a force thereto, the bell crank device converting the first force to a second force and applying the second force to the coupling member via the lift member for lifting the structure. A movement of the structure is compensated by rotation of portions of the longeron assembly which repositions the apex, the bell crank, and lift arm to maintain the structure in the lifted position.

Abstract: An elevator assembly includes a carrier, a first arm, and a second arm. Each arm has a primary portion pivotally connected to the carrier and a secondary portion pivotally connected to the primary portion. A first gear system interconnects the first arm and the second arm for synchronous rotation with respect to the carrier in opposite directions. A pair of second gear systems establish a geared relationship between the secondary portions of the arms and the carrier. A support member is connected to the secondary portions of the arms, wherein rotation of the primary portions of the arms with respect to the carrier drives the support member between a neutral position and at least a first extended position.

Abstract: A mobile jack is provided for a vehicle the where the mobile jack includes a movable base with a plurality of rollers adapted for moving the jack upon a generally horizontal support surface and positioning the jack under a load. The mobile jack may lift loads using a scissor assembly lying in a vertical plane where the scissor assembly connected between the movable base and an upper platform. Additionally, the mobile jack may include at least one hydraulic cylinder for actuating the scissor assembly. The mobile jack may include a safety lock for locking the upper platform in a lifted position where the lock is movable between at least one locked and unlocked position. When the upper platform is in the lifted position, the lock automatically moves to the locked position so that it cooperates with the scissor assembly to prevent the scissor assembly from lowering independent of the cylinders.

Abstract: A preferred embodiment of a system includes a lifting device for lifting a motor vehicle, a support structure for mounting the lifting device in a pit, and a carriage for supporting the lifting device from the support structure and being movable within the support structure. The system also includes a cover coupled to opposite sides of the carriage so that the cover extends away from the carriage and continuously between the opposite sides of the carriage.

Abstract: A motor vehicle lift includes two parallel runways, each provided with at least two elevating devices each having first and second uprights hinged to each other, to the floor (runway) and to the runway (floor) respectively; first and second arms hinged together, the second arm being further hinged to the second upright along a hinging axis equidistant from the axis on which the second upright is hinged to the runway (floor) and from the end of the second arm, which is slidable along a guide provided in the runway (floor), the first arm being also hinged to the first upright; and an actuator device securable selectively to two elements of the quadrilateral formed from the first/second uprights and the first/second arms, at least one of the parts of the quadrilateral being provided with elastic means to vary the dimension between the two hinged ends.

Abstract: A scissor lift comprises a load support, a lift support and at least one scissor assembly defined between the load support and the lift support, the at least one scissor assembly being driven into an open or a closed position by a drive device that enables movement of the load support relative to the lift support with the opening and closing of the at least one scissor assembly, wherein the at least one scissor assembly is further defined by a pair of arms attached at a pivot, and where the pair of arms further comprises a curved outer surface that engages a portion of a drive device for urging the scissor arms apart and for moving the load support relative to the lift support

Abstract: The invention relates to a lifting device for lifting objects, such as motor vehicles, comprising at least one main lifting unit (22, 23), at least one additional lifting unit (24, 25), the additional lifting unit (24, 25) being disposed on the main lifting unit (22, 23) in such a way that a main lifting height (hh) of the lifting platform may be extended to a total lifting height (hg) by using the additional lifting unit (24, 25), and comprising a control unit (200) for controlling the main lifting unit (22, 23) and the additional lifting unit (24, 25), characterized in that the control unit (200) may be switched from controlling the main lifting unit (22, 23) to controlling the additional lifting unit (24, 25) as well as from controlling the additional lifting unit (24, 25) to controlling the main lifting unit (22, 23) via corresponding actuators (18, 19, 20, 21).

Abstract: The remote control car support apparatus supports a remote control (RC) car. The height of the apparatus can be adjusted for a total height of up to 16 inches. The length of the apparatus can be adjusted to accommodate various sizes of RC cars, from about 1/10th scale to about ?th scale, with an overall length adjustable up to about 27 inches. The apparatus features a total width of about 12 inches so that an RC car is not likely to tumble over when held. The apparatus provides for a full 360 degrees of rotation of a car, with the rotation locked in position as chosen. With these features, all facets of an RC car are accessible, allowing a hobbyist to work on the car as chosen. The plurality of mount holes in the adjustably positioned mounts allow for a car to be held to the apparatus as chosen.

Abstract: The present invention relates to a spring compression apparatus for compressing a coil spring and a related method of making this apparatus. A top plate is provided that engages and supports a first end of a coil spring. A middle plate engages and supports a second end of the coil spring, so that the coil spring is supported between these two plates. A base plate is disposed on an opposite side of the middle plate from the top plate. A frame is formed that fixedly supports the top plate and the base plate. The frame also slidably supports the middle plate. A jack, which is positioned between the base plate and the middle plate. The jack urges the middle plate toward the top plate, so as to compress the coil spring.

Abstract: A preferred embodiment of a system includes a lifting device for lifting a motor vehicle, a support structure for mounting the lifting device in a pit, and a carriage for supporting the lifting device from the support structure and being movable within the support structure. The system also includes a cover coupled to opposite sides of the carriage so that the cover extends away from the carriage and continuously between the opposite sides of the carriage.

Abstract: The modular garage storage system includes a geared retraction system that allows a storage platform of the modular garage storage system to be lowered for easy access to loading and loading the storage platform, and that allows the storage platform to be raised up to be completely out of the way.

Abstract: This involves a cart that can be used in changing a marking module in a xerographic color marking system. The cart has a lifting mechanism securely attached to its upper surface. When the marking module is to be changed and a new replacement module installed, the lifting mechanism is used to support the marking module during each of these procedures. Since the marking modules are relatively heavy (30-35 lbs.), to prevent accidental damage to the module, the cart and its attached lifting mechanism are conveniently used by the customer. The lifting mechanism is made up of an upper cradle, a bottom plate attached to the cart and a movable linkage. The module securely rests in the cradle in both removal and installing operations. It is not uncommon for a customer to want to change a color or colors in one or more modules. This cart and its attached lifting mechanism makes it relatively easy to accomplish this change.

Abstract: A substantially vertical lift system is disclosed herein. The substantially vertical lift system is comprised of a platform, base, and a lifting mechanism. The lifting mechanism is designed to displace the platform in a substantially linear manner, and if desired, in a position parallel to the base. Multiple lifting mechanisms may be used, and displaced either in a side-by-side or stacked orientation. The configuration of the lifting mechanism is implementation dependent.

Abstract: This invention provides a xerographic marking module that has a built-in lifting mechanism that is useful in installing a new module in a xerographic marking system. The lifting mechanism forms the bottom portion of the marking module and comprises an upper cradle to hold the remaining module portion, a lower plate that constitutes the bottom of the module when in a collapsed position, and a movable linkage that connects the cradle to the lower plate. When in installation mode, the linkage creates a vertical force which will upwardly push the cradle (holding the module) away from the lower plate into an installation elevation. After slides in the module and in the color marking system are mated, the lifting mechanism is collapsed and the module pushed into the color marking system or apparatus.

Abstract: A scissor jack assembly may have a base member for resting the jack assembly against a supporting surface and a support bracket assembly. First and second lower arm members may each be of an open channel construction with a width extending between a pair of outer sidewalls. One end of each lower arm member may be connected to the base plate. First and second upper arm members may each be of an open channel construction having a width extending between a pair of outer sidewalls. One end of each outer one end may be connected to the support bracket assembly. First and second trunnions may connect the upper arms with the lower arms. Each of the trunnions may include a bore. A rotatable shaft member may extend into the bores of the first and second trunnions.

Abstract: Example methods, apparatus, system, and articles of manufacture for releasably locking components that are moveable relative to one another are disclosed herein. A disclosed example locking apparatus includes a locking device mountable to a first component and including at least one locking member. The example system also includes a catch member mountable to a second component. The catch member has a plurality of substantially similarly formed catches. The locking member is engageable with at least one catch in a plurality of predetermined catching positions in at least one of a releasable, form-locking manner or a releasable, force-locking manner. The example system also includes a force member to produce a relative movement between the locking member and the at least one catch. In at least a partial region of the catch member, at least a first catching position, a second catching position and a third catching position are traversable by the locking member.

Abstract: Parallelogram lift for motor vehicles, comprising a pair of base longitudinal members (2), a pair of runways (12) and at least two pairs of arms (14, 14?) hinged to the longitudinal members (2) and to the runways (12) and associated with members (30) for varying the inclination of said arms (14, 143 to the longitudinal members (2) and to the runways (12), wherein each longitudinal member (2) comprises a fixed base (4, 6) anchored to the floor, and a counter-base (8) slidable axially relative to the fixed base and carrying the arms (14, 143) hinged thereto, and also comprises for each longitudinal member (2) an auxiliary arm (22) hinged at its lower end to a support (26) fixed to the floor in alignment with the longitudinal member and pivoted at its upper end to the central point (20) of the adjacent main arm (14), the length of the auxiliary arm (22) between its pivotal axes (24, 20) being equal to one half the length of the main arms (14, 14?).

Abstract: A vertical lift mechanism (100, 100a, 100b) including: a lift support assembly (102) comprising an upper frame member (104), a lower frame member (106), the upper frame member is movable between a lowered position and a lifted position. The lift support assembly additionally includes a support mechanism (150) that holds and maintains the alignment between the upper frame member and a lower frame member as well as a powering unit to cause movement of the upper frame.

Abstract: The invention involves a scissor jack having four arms hingedly arranged to provide two opposite elbows between a base and a load support. A pair of trunnions at the elbows is connected by a threaded shaft. A movable brace is supported between the arms. The brace strengthens and adds support to the jack assembly. In a preferred embodiment, the brace includes a guide assembly which slidably engages the shaft and connectors pivoted between the guide and each of the four arms. The connectors are extensible socket and rod arrangements. Each connector includes a coil spring located over the rod in the socket. The four springs are compressed on extension of the jack to assist in lifting a load.