Abstract: The present disclosure relates to the technical field of aerial work platforms, in particular to a linear actuator with a contact type safety nut, and an aerial work platform. The linear actuator includes a central screw, a driving nut mechanism, and a safety nut mechanism. The central screw has a screw raceway. The safety nut mechanism includes a safety nut seat sleeved at the periphery of the central screw. Limit hole channels pointing to the central screw are arranged on the safety nut seat. An elastic buffer element is arranged in each of the limit hole channels. A safety ball is arranged between the elastic buffer element and the central screw. The contact type safety nut enables the linear actuator to always keep safety, stability, and no loss of accuracy in a conversion process that the safety nut mechanism gets involved to take effect while the driving nut mechanism fails.

Abstract: A safety latch system includes a mount, a pawl member, a ratchet member, and a release assembly. The mount is mountable on a housing of a piston. The pawl member is coupled to the mount. The pawl member includes a pawl. The ratchet member has a first sidewall that includes a first connecting portion that is connectable to an end portion of a piston rod of the piston. The first sidewall includes a teeth portion, which is configured to engage with the pawl. The release assembly is configured to provide an engaged state between the pawl member and the ratchet member. The release assembly is also configured to provide a disengaged state between the pawl member and the ratchet member.

Abstract: A handling apparatus moves drilling elements from and to a drill floor of a drilling rig includes a main support structure having a first end and a second end. An extendable ramp is between the first end of the main support structure and the drill floor. A carrier is movable relative to the main support structure and includes a first end close to the ramp and a second end distant from said ramp. A lift arm lifts and positions the carrier and includes a first end and a second end. The carrier moves between: a first position, in which the carrier is arranged above the main support structure; and a second position, in which the carrier is lifted at the level of the drill floor. The lift arm is under the carrier to move and support the second end of the carrier from and to the second position.

Abstract: A light-weight kit for lifting vehicles, configured to be removably added to and used with a two-post vehicle lift by one person with no tools or with just conventional hand tools. A kit may include a pair of support beams each extending longitudinally from a front end to a back end and each comprising at least two arm connection structures each configured to removably engage and be supported by the vehicle support pad structures on the ends of the arms of the vehicle lift. A pair of baskets may be configured to support a vehicle each have an upwardly-concave cross-section extending between first and second transversely spaced hanging structures configured to be removably and selectably attached with and supported by the support beams at longitudinally-spaced mounting positions on the support beam.

Abstract: Apparatuses, systems, and methods for providing mobility device lifting and positioning are provided. A lifting and positioning apparatus includes at least one support structure, a control unit configured to cause the apparatus to perform at least one operation, at least one lifting mechanism coupled to the at least one support structure, the at least one lifting mechanism configured to operate at least in part according to one or more signals received from the control unit, a platform support assembly coupled to the at least one lifting mechanism, the platform support assembly having at least one arm pivotally attached thereto, and a platform coupled to the at least one arm, the platform configured to be positioned in at least one of a collapsed and a non-collapsed configuration, the platform further including a ramp pivotally coupled thereof.

Abstract: A pit for containing a vehicle lifting apparatus is constructed from a plurality of precast concrete pieces and assembled in a trench. Conduit, plumbing, heating elements, and the like are cast into the pieces to facilitate safe construction/assembly of the pit. A lift apparatus is assembled or positioned in and at least partly attached to the pit. One or more mounting features are cast into and/or attached to the pit wall to help fix the lifting apparatus relative to the pit and/or to help fix the pit relative to a surrounding building.

Abstract: There is provided a vehicle lift which includes, under the support plate (1) of the vehicle a lifting/lowering mechanism (101) having at least two pairs of levers articulated to one another in an intermediate section, which constitute the two forks, moved by at least one fluid-dynamic actuator (9). The fluid-dynamic actuator (9) acts on an articulated system (10), which supports at least one first roller (20) and at least one second roller (21) arranged on respective axes. The two rollers (20, 21), in the initial step of lifting/opening the fork, are kinematically coupled with two corresponding inclined surfaces.

Abstract: A green simulation apparatus having a configurable upper surface with a changeable contour may comprise a covering forming the upper surface and a covering support assembly configured to support the covering. The support assembly may comprise a plurality of movable positioning elements having the covering resting thereon and positioned in an array extending in a reference plane and movable along axes extending substantially perpendicular to the reference plane. The support assembly may comprise a movement actuator configured to move at least one of the positioning elements independently of other positioning elements in the array.

Abstract: Embodiments of the invention cover a variety of assemblies that can be used for loading, unloading and securing materials for transport. In all embodiments, the storage rack assembly includes a first horizontal support, at least one vertical lift arm connected to the horizontal support, and at least one lifting mechanism integral to a vertical lift arm wherein the assembly is attachable to the rear section of a vehicle. The vertical lift arm can, in some embodiments, also function as the lifting mechanism. A unique feature of all embodiments is the ability to raise and lower the rear section of the storage rack to accommodate the loading and unloading of materials.

Abstract: According to at least one exemplary embodiment, a scalable jacking machine system may be provided. The system may include at least one jacking machine, which may include at least one controller, at least one monitoring device, and at least one electronically controlled valve. The at least one controller may be configured to communicate over a wired or wireless network with a controller of at least one other jacking machine, allowing the jacking machines to operate in unison.

Abstract: A system and method for servicing a rotor of a generator are presented. The system includes a carriage for carrying the rotor. At least one carriage steering device are arranged on the carriage for steering the carriage when traversing along a removal skid during servicing the rotor. The carriage steering device is attached to the carriage in a way that it is accessible from above the carriage. The carriage steering device is adjustable such that a center of the carriage aligns to a center rail of the removal skid when traversing along the removal skid during servicing the rotor.

Abstract: A lift system 100 may comprise two sets of two pistons with each set of pistons attached to an upper cross bar 210 and a lower cross bar 275, with the lower cross bar having distal ends comprising distal insertion areas 276 with the distal insertion areas passing through a first void 241 defined within a wheelie bar 240 and the distal insertion areas 276 reaching further to move a wedge bar 270. To lift a patient from a lowered position, a piston moves a lower cross bar 275 which in turn moves a wedge bar 270 into a wedge 280, causing the lower cross bar to break out of plane with a top bar 205. The use of two wheelie gears 220 ensures that the lift remains horizontal even if piston forces are not uniform.

Abstract: A lift system 100 may comprise two sets of two pistons with each set of pistons attached to an upper cross bar 210 and a lower cross bar 275, with the lower cross bar having distal ends comprising distal insertion areas 276 with the distal insertion areas passing through a first void 241 defined within a wheelie bar 240 and the distal insertion areas 276 reaching further to move a wedge bar 270. To lift a patient from a lowered position, a piston moves a lower cross bar 275 which in turn moves a wedge bar 270 into a wedge 280, causing the lower cross bar to break out of plane with a top bar 205. The use of two wheelie gears 220 ensures that the lift remains horizontal even if piston forces are not uniform. The use of four top bars 205 allows for folded storage.

Abstract: In a vehicle lift device (100) including a pair of right and left lifting frames (10) installed on right and left sides of a maintenance work area (A) of a vehicle to be serviced (1), and a pair of front and rear swing arms (20, 50) supported at two respective front and rear positions of a lifting platform (11) included in each of the lifting frames (10), and allowed to be lifted and lowered along with the lifting platform (11), each of the swing arms (20, 50) includes a link coupling body (20A, 50A) obtained by connecting a plurality of links, a base link (21, 51) included in the link coupling body (20A, 50A) is fixed to the lifting platform (11) of the lifting frame (10), and a distal link (22, 52) included in the link coupling body (20, 50A) includes a vehicle holding tool (30, 60).

Abstract: A lift assembly for a utility vehicle storage area includes a floor supported by a scissor mechanism, an actuator for raising the scissor mechanism and the floor from a neutral position to an elevated position, a plurality of rollers attached to the floor, guide members attached to the scissor mechanism and within which the plurality of rollers move, and a detent protruding into one of the guide members to resist rotation of at least one of the plurality of rollers and create a pivot point about which the floor rotates to a pivoted position. The floor may be rotated to the pivoted position from the neutral position, the elevated position, or any position between the neutral and elevated positions. In addition, the floor may be removed from the assembly by passing the first and second pairs of rollers through the cutouts in the guide members.

Abstract: Thermoplastic components may experience local damage, including cracks and decohesion of fiber reinforcements, among others. Such thermoplastics may be repaired by heating them to a suitable softening/melting temperature under pressure and maintaining them under pressure and at elevated temperature until the damage is healed. This may be done in-place using custom-fabricated, suitably-shaped die portions maintained under pressure by magnetic attraction. Various heating methods and die portion fabrication methods are described.

Abstract: A variable depth swimming pool/spa can comprise a movable deck and a bottom. The movable deck can be movable relative to the bottom of a variable depth swimming pool/spa to provide for a variable depth of the portion of pool/spa that is accessible to a pool/spa user. The movable deck can be connected to the bottom of the variable depth swimming pool/spa via one or several legs. The one or several legs can be rotatingly connected to the movable deck and can be slidingly connected to the bottom of the swimming pool/spa. The rotational displacement of the legs can result in the vertical displacement of the movable deck. The legs can be connected to synchronizing arms that can interact with a synchronizing drive to coordinate the movement of a first leg with a second leg.

Abstract: A hybrid wedge jack/scissor lift device for lifting heavy loads is provided, the device having a horizontally-oriented actuator coupled to a wedge that acts on lower and upper rollers coupled to a scissor lift. In operation, the actuator can drive the wedge in between the rollers, spreading them apart to raise the scissor lift. When the actuator retracts, the wedge is removed and the scissor lift collapses under the weight of the load. The wedge can be shaped in such a way that the lift has one or more intrinsically safe positions in which the rollers on the scissor lift fit into seats on the wedge, preventing the scissor lift from collapsing in the event of an actuator failure. An optional restraint bar safety mechanism is also provided.

Abstract: A pallet lifter for raising and lowering a pallet. The pallet lifter includes a pallet platform, a lifting frame that supports the pallet platform, and a movement mechanism that controllably causes the pallet platform to raise and lower. The pallet platform includes a top surface designed to support a pallet, two side walls and a back wall. The lifting frame includes two sets of legs. One end of one or both of the two legs of each set of legs is moveable along a longitudinal axis of the pallet platform as the pallet platform is raised and lowered. The movement mechanism includes a motor and a threaded rod. The electric motor is designed to cause the threaded rod to rotate in a clockwise and counterclockwise direction to cause said pallet platform to raise and lower.

Abstract: A method for final assembly of at least two aircraft includes assembling the at least two aircraft in a transverse direction on a carousel, the at least two aircraft disposed side-by-side, and rotating the carousel on a vertical rotation axis 360°.

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, where the bottom frame is connected to a bottom frame point of attack at another end of the lever arm and where 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 pneumatic system with multiple air reservoirs is connected to the bellows of a load elevator. A plurality of valves enables the optional pneumatic connection of different combinations of reservoirs so as to change the range of operation of the elevator to meet the self-adjusting weight requirements of a particular job at hand. In the preferred embodiment, the air actuator is pneumatically connected to a main air reservoir, which in turn can optionally be coupled in series with one or two additional reservoirs of different capacities. As a result of this configuration of its pneumatic system, the elevator can be switched between and operated at three different load levels, at the convenience of the operator, without changing the amount of air in the system.

Abstract: The invention relates to a vehicle elevator, comprising: at least one carrier with a length direction for carrying a load thereon, such as a vehicle, and a lift under the carrier, which lift comprises at least two rotating components in a single line of assembly, wherein the rotating shaft extends along the line of assembly. The invention also relates to a lift for assembly in a vehicle elevator.

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: The invention relates to a vehicle elevator, comprising: at least one carrier with a length direction for carrying a load thereon, such as a vehicle, and a lift under the carrier, which lift comprises at least two rotating components in a single line of assembly, wherein the rotating shaft extends along the line of assembly. The invention also relates to a lift for assembly in a vehicle elevator.

Abstract: The present invention relates to a collapsible seat base. When operatively interconnected, and in its raised resting position, the device forms what is substantially a forward leaning parallelogram bisected by the consolidated length of a slide and slide-guide, which forms two substantially congruent triangles sharing a common side. In its lowered resting position, the device collapses to form an elongated rectangle bisected by the fully extended slide and slide-guide and rests substantially atop its support surface at a height defined by the cumulative thickness of each component. Generally the support mechanism comprises: a base and support member, a first and second side member, a slide and a slide-guide.

Abstract: Methods and systems for a multi-capacity vehicle lift system are provided. The system includes a lift assembly having a plurality of lift capacities and a load platform coupled to the lift assembly. The load platform includes a plurality of lift starting positions, each of the plurality of lift starting positions corresponding to a respective one of the plurality of lift capacities.

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: An automotive lift comprises a pair of runway sections. Each runway section comprises a deck portion, two pairs of legs, and a pair of elongate sliding members. The pairs of legs are pivotally coupled with the deck portion. The elongate sliding members are pivotally coupled with the pairs of legs and are slidable relative to the deck portion. A hydraulic cylinder assembly is coupled with the deck portion by a clevis and with the elongate sliding members by a piston and piston block. The hydraulic cylinder assembly is operable to translate the elongate sliding members relative to the deck portion, thereby pivoting the pairs of legs relative to the deck portion to lift the deck portion relative to the ground. A hydraulic system is operable to synchronize lifting of the runway sections. A braking mechanism is configured to restrict descent of the runway sections.

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 multi-level vehicle lift comprising a first platform mounted for movement between a lowered position and a raised position. A second platform is positioned below the first platform and is coupled to the first platform by a lift member such that movement of the first platform above a first raised position causes movement of the second platform. A third platform is positioned below the second platform and coupled to the first platform by a lift member such that movement of the first platform above a second raised position causes movement of the third platform A pit may be positioned below the platforms, and the lower-most platform is in the pit when the first platform is in the lowered position. Preferably, the pit is recessed into a ground surface, and an upper surface of the first platform is substantially flush with the ground surface when in the lowered position.

Abstract: The present invention increases an allowable maximum weight of an object to be loaded on a conveyance device using a carriage including an object support base movable vertically controlled by cam rails on the floor side without increasing the weight of the conveyance carriage itself, and is characterized in that the object support base 11 is supported movably vertically on a conveyance carriage 1 via a crosslink mechanism 10, the crosslink mechanism 10 is provided with an elevating cam follower roller 32 which moves up and down in conjunction with standing and falling movements of the crosslink mechanism 10, and in a conveyance carriage traveling path, a cam rail 50 which pushes up the elevating cam follower roller 32 is provided, wherein an urging means 45 which urges the object support base 11 upward is provided, and an urging force of the urging means 45 is set so as to move up the object support base 11 when no object is loaded on the object support base 11, however, when an object is loaded on the object

Abstract: A tire handling apparatus comprises a structural body composed of a hydraulically actuated scissor lift assembly for adjusting the height of a tire receiving platform; a movable plank that can be stowed away when not in use but is protruding off the side of the body so that it can receive a tire removed from a vehicle. The plank slides longitudinally across the length of the receiving platform so as to be in line with an empty receiving niche. The structural body is on wheels so that the tire handling apparatus can be moved from location to location as required.

Abstract: A lift machine comprises a base, a support for supporting a load above the base, a lift actuator operatively connected between the base and the support for raising and lowering the support relative to the base, and a support stabilization mechanism operatively connected between the base and the support for stabilizing the support relative to the base during raising and lowering of the support by the lift actuator. The support stabilization mechanism comprises a pair of opposed linkages, with each of the pair of opposed linkages having a lower torque tube link and an upper torque tube link. The lower torque tube link has a torque tube operatively pivoted to the base. The upper torque tube link has a torque tube operatively pivoted to the support.

Abstract: A vehicle storage lift includes a base frame having a first floor engaging leg parallel to a second floor engaging leg. A vehicle support supported by the base frame is movable between a load position and a store position. First and second support arms connect the vehicle support to the base frame. Each of the first support arms are connected at one end to the first leg and at an opposing end to the vehicle support. Each of the second support arms are connected at one end to the second leg and at an opposing end to the second frame member.

Abstract: A vehicle lift device and method are provided wherein the lift device has upper and lower platforms that may receive vehicles for parking or storage. The lower platform may be selectively raised or lowered between two levels of a parking structure. The upper platform is mounted on telescoping supports. When the car lift device is raised to place the lower platform at the upper level of the parking structure, the telescoping posts retract allowing the upper platform to lower, thereby providing clearance between the upper platform and a ceiling of the parking structure. The posts retract by the weight of the upper platform, and no hydraulic assist is required. When the lift device is lowered to place the lower platform at the lower level of the parking structure, the upper platform engages the floor of the upper level of the parking structure and thereby covers the opening in the floor. The telescoping posts then extend as the lower platform travels to its lowered position at the lower level.

Abstract: A wheel lift system for efficiently lifting and positioning a wheel and tire onto a wheel hub. The wheel lift system includes a first arm and a second arm pivotally attached to one another, a plurality of caster wheels attached to the lower portion of the arms, and a first support and a second support extending from the arms respectively for supporting a wheel and tire. A bias member is preferably attached to the arms for providing a bias force that assists in elevating the wheel and tire. Alternatively, a bias unit may be attached to the arms for providing a bias force that assists in maintaining elevation of a wheel and tire.

Abstract: A lifting device, particularly for lifting wheels of vehicles and the like, for wheel balancing and tire removing machines, comprising a scissor-like frame, which is interposed between at least two flat and mutually parallel elements for their mutual translational motion as a consequence of the action of motor means functionally associated with the scissor-like frame, the lifting device further comprising a cam-type profiled element, which can be engaged functionally with the motor for dynamic and static balancing between the thrust force generated by the motor and the contrast force of the scissor-like frame in addition to the weight of the object to be lifted, which is arranged on one of the two flat and parallel elements, in all the operating positions of the lifting device.

Abstract: A method for lifting, stacking or otherwise manipulating a length of pipe is provided which includes the steps of providing a longitudinally orientated base frame; providing a movable carriage supported on the base frame, and providing a pipe lifting structure mounted to the carriage for independently supporting a length of pipe in a longitudinal position with respect to the base frame. The pipe lifting structure has first and second telescopically extendable lifting arm assemblies that are pivotally mounted to a longitudinally orientated pipe trough for supporting a length of pipe in the pipe trough. A means for pivotally raising and lowering the lifting arm assemblies and thereby said pipe trough and support length of pipe is provided. The method includes providing means for pivotally raising and lowering the lifting arm assemblies remotely located from the pipe lifting structure. Hydraulic cylinders and rams are provided to move the lifting structure.

Abstract: Methods and systems for a multi-capacity vehicle lift system are provided. The system includes a lift assembly having a plurality of lift capacities and a load platform coupled to the lift assembly. The load platform includes a plurality of lift starting positions, each of the plurality of lift starting positions corresponding to a respective one of the plurality of lift capacities.

Abstract: An elevating transport apparatus for elevating and transporting a body to be transported, with an elevating section connecting a transport path and a transport path positioned at different heights. A first support shaft in the horizontal direction and a second support shaft are disposed parallel to each other on a stand. The second support shaft can be freely moved to approach or separate from the first support shaft, with guide apparatuses. A crank arm is supported by the second support shaft, and a distal end portion of a swing arm supported by the first support shaft is linked via a linking shaft to an intermediate position of the crank arm. A transport body support apparatus is provided via a free end support shaft on the free end section of the crank arm and can hold the body via a transport machine.

Abstract: A lift machine comprises a base, a support for supporting a load above the base, a lift actuator operatively connected between the base and the support for raising and lowering the support relative to the base, and a support stabilization mechanism operatively connected between the base and the support for stabilizing the support relative to the base during raising and lowering of the support by the lift actuator. The support stabilization mechanism comprises a pair of opposed linkages, with each of the pair of opposed linkages having a lower torque tube link and an upper torque tube link. The lower torque tube link has a torque tube operatively pivoted to the base. The upper torque tube link has a torque tube operatively pivoted to the support.

Abstract: A scissor lift device is provided having twin vertical screws that act to raise or lower a substantially horizontal and flat platform using a pair of scissor jacks. A single DC motor can be provided within the scissor lift device housing, and is operatively connected to one vertical screw. The other vertical screw is connected to the first by a locked linkage that passes from one screw to the other in the base of the scissor lift device. As such, rotation of the motor results in an equal movement in both vertical screws, and thus equal movement of both scissor jacks. The configuration is easily serviced and installed, and is adapted to have the stationary and moveable components each covered by a protective shells. Additionally, the platform of the device can be easily leveled using a locking pin to lock the platform in a level position once the base of the device has been installed.

Abstract: A lift machine comprises a base, a support for supporting a load above the base, a lift actuator operatively connected between the base and the support for raising and lowering the support relative to the base, and a support stabilization mechanism operatively connected between the base and the support for stabilizing the support relative to the base during raising and lowering of the support by the lift actuator. The support stabilization mechanism comprises a pair of opposed linkages, with each of the pair of opposed linkages having a lower torque tube link and an upper torque tube link. The lower torque tube link has a torque tube operatively pivoted to the base. The upper torque tube link has a torque tube operatively pivoted to the support.

Abstract: A lift for lifting motorcycles, ATV's, or any similar vehicle. The lift includes a base, an upright extending from the base, a four-bar load-transferring lifting mechanism, a lifting frame adapted to engage the vehicle, and an operator for lifting and lowering the lifting frame.

Abstract: A wheel lift system for efficiently lifting and positioning a wheel and tire onto a wheel hub. The wheel lift system includes a first arm and a second arm pivotally attached to one another, a plurality of caster wheels attached to the lower portion of the arms, and a first support and a second support extending from the arms respectively for supporting a wheel and tire. A bias member is preferably attached to the arms for providing a bias force that assists in elevating the wheel and tire.

Abstract: A storage device for the bed of a pickup truck has a body with a storage area therein and a scissors lift connected to the body for moving the body between a first position on the bed of the truck and a second position above a side wall of the truck. The scissors lift includes a top plate, a bottom plate, first and second scissors pivotally connected to the top plates and a motor cooperative with the scissors so as to move the top plate relative to the bottom plate. A spring is in tension and extends between the scissors between when the body is in the first position.

Abstract: A luggage storage structure for an automobile includes: a storage concave portion formed so as to project downward on a floor panel and capable of storing luggage, a plate member for approximately closing an upper part of the storage concave portion, and a transfer mechanism for transferring the plate member approximately up and down in an upper part of the floor panel. The luggage structure is securely protected by the plate member and the transfer mechanism.

Abstract: The disclosed invention is a portable vehicle lift for elevating a motor vehicle. The lift includes spaced apart beams which are positioned under the vehicle, each beam has a plurality of hinged strut pairs, each with associated threaded collars. Strut pairs are moved together or apart by directionally rotating a threaded shaft through the threaded collars. Supplemental lift springs may be positioned along the shaft to selectively engage and urge the strut pairs during operation.

Abstract: A lift assembly includes a first platform provided with a top surface, a pair of opposed sides, and wheels and brackets connected to one of the sides for rotating the assembly. A plurality of rectilinear support shafts have opposed end portions conjoined to the platform and extending upwardly therefrom, and are spaced at opposed corners of the platform. Inverted U-shape guide rails are telescopically engageable along a length of the support shafts and have a pair of rectilinear regions slidably positionable about the support shafts. A second platform is provided with top and bottom surfaces, and apertures formed at opposed corners thereof that are vertically registered with the support shafts. A lifting mechanism is included for vertically biasing the second platform and the guide rails along the support shafts. The lifting mechanism is connected to the top surface of the first platform and the bottom surface of the second platform.