Abstract: A single beam aerial work platform with a base structure, top structure, and at least three scissor mechanisms. A hydraulic cylinder for raising the top structure relative to the base structure is attached between the first or lower scissor mechanism and the third or top scissor mechanism. The hydraulic cylinder is attached by a mounting bracket at an offset to the pivot points and structural members of the scissor mechanisms. An additional stress reducing beam, attached parallel to one of the structural members of the middle scissors mechanism, reduces the horizontal bending stress in the structural members of the scissor mechanisms and the connecting pin loading in the scissor mechanism pins.

Abstract: A device for opening a scissor-type jack with paired cross-bars, the device having a chamber of variable volume connected to fluid inlet and outlet provided by end plates to which two cover plates are fixed. The first cover plate has two flanges disposed on the opposite sides of the cover plate and extending to a second cover plate and are connected for rotation of the first cover plate to the cross-bars. The second cover plate has two flanges. The distance between the two flanges is smaller than the distance between the flanges of the first cover plate and the flanges of the first cover plate are coaxially connected for rotation to the inside surface of the outer cross-bars, while the flanges of the second cover plate are coaxially connected for rotation to the inside surface of the inside cross-bars. In this way the axis of the rotary connection of the two cover plates to the cross-bars, intersects a line joining the centroids of the two end plates.

Abstract: A scissors lift apparatus has three scissor units for supporting heavy loads. A central scissor unit has its arms located inwardly of the immediately lower and upper scissor units, and folds into the upper and lower scissor units for storage within a chamber in a mobiled chassis. The scissor arms of the upper and lower scissor units includes rectangular box beams with a greater vertical than horizontal dimension. Hydraulic cylinders are located within and coupled to the opposite two arms of the center scissor unit to expand and collapse the same. The mobile chassis has front steering wheels mounted with hydraulic powered-caster-type wheel drive and steering apparatus. The steering king pin is laterally offset from the vertical plane through the center of wheel. A dual fail safe braking unit on the trailing wheels has an applied hydraulic cylinder unit including a floating cylinder with a single spring applied piston and rod which is supported in a fixed journal and connected to one wheel.

Abstract: An elevating mechanism includes a frame supported above and in parallel to a base, the base and the frame are stably coupled together by a pair of lazy tong constructions, the pair of lazy tong constructions include four pivot axles defining a plane which is parallel to the base and the frame, a block secured on each of the pivot axles for engaging with two parallel bolts, the end portions of the bolts have outer thread of different screw directions such that the blocks are caused to move toward each other or to move away from each other when the bolts are rotated, the lazy tong constructions can thus be extended or retracted when the blocks are moved toward each other or moved away from each other.

Abstract: The present invention overcomes existing problems by the provision of a lifting device below the lowest shanks and endwards of the platform. The lift stroke of the highest scissor obtains thereby a many times longer stroke relative to the very short stroke of the lifting device. In another preferred arrangement of the invention, two columns of scissors are mounted parallel laterally of each other for synchronized operation. The highest scissor-shanks then connect to top arms which bear holder shafts on which holders are kept to extend downwards from the holder shafts. The holders then carry on their lower ends the platform, whereby the platform can become sank down for meeting the level of the ground for an easy loading of the platform. The holders with the platform can become replaced by a cabin. The lifting device of the invention requires thereby only small space for instalment in a house or a hall.

Abstract: A mechanized container handling system on a motorized refuse collection vehicle includes a horizontally extensible and retractable support structure having an outer end on which a container grasping assembly is carried, and a container elevating and dumping assembly for lifting the grasped container and dumping its contents into an elevated hopper opening of the vehicle. The support structure comprises telescoped inner, intermediate and outer sections interconnected by an extension scissors structure, the intermediate section being horizontally driven by a hydraulic actuator and the scissors structure being operative to responsively extend and retract the outer section. The container elevating and dumping system is driven by a hydraulic piston and gear system positioned between the upper ends of a pair of support tracks and drivingly connected to a pair of articulated container lifting force arms.

Abstract: the roof top carrier of the present invention has a roof top platform that moves horizontally between a storage position at the center of the roof of a motor home and an extended position adjacent the side of the motor home. A drop cradle moves vertically out of the roof top platform in its extended position to a lower position at ground level to provide user access to equipment or luggage stored in the roof top carrier. Two separate motors power the horizontal movement and the vertical movement for moving the equipment and luggage from the roof to the lower position at ground level alongside the motor home.

Abstract: A vehicle lift has a support platform and a pair of scissor mechanisms underneath it for supporting it, and raising and lowering it. An actuator, for example, an hydraulic cylinder, that is connected between the scissor arms. The ends of one pair of scissor arms include rollers for engaging the ground, the rollers permitting the lift to be raised and lowered. A cart or other lifting device is provided for lifting one end of the lift, to support it on wheels of the cart. With the other end of the lift supported on the rollers of the scissor arms, the lift can be freely moved around on a flat surface. The lift can have a simple ratchet locking mechanism including a cam, which provides a simple mechanism for locking the lift in a raised position, and for enabling it to be lowered.

Abstract: A cargo handling vehicle such as a forklift truck having a push-pull unit is improved in responsibility, operation speed and in precise operability by: replacing a conventional hydraulic cylinder for moving a face member 10 back and forth along forks 9 of the vehicle with an electric motor 32. The thus employed motor 32 also eliminates a fear that a cargo 26 is smudged with oil leaking from the hydraulic cylinder and pressurized-oil supply pipes thereof. In cargo loading and discharging operation conducted by the cargo handling vehicle, the face member 10 of the push-pull unit of the vehicle is automatically operated so as to move back and forth along the forks 9 of the vehicle at the substantially same traveling speed as that of the vehicle in a direction counter to a vehicle traveling direction, whereby the sheet pallet B' carrying the cargo 26 is kept substantially stationary during cargo loading and discharging operation or the vehicle.

Abstract: A booster link arm positioning device for position or from a top to bottom position. The link arm is maintained by spring tension in the proper positions by the use of two torsion springs during first and second stage operations. In the second stage the link arm is disengaged from the hydraulic cylinder rollers and is maintained in a vertical position by a blocking bar. Upon lowering the upper frame to its bottom position, the link arm and yoke will re-engage with the hydraulic cylinder rollers at the proper location.

Abstract: Vehicle lifter is a vehicle lifting jack, which is a modification of prior art scissor jack by replacing its top member with a wheel support plate, which has restricted pivotable movement, to enable it to be lowered to the ground at the wheel support plate low position, so that he vehicle wheel could enter on the top of the wheel support plate and obtain a stable position, then after placing the safety wedges, the vehicle lifter is operated by a conventional long handle ratchet wrench to obtain wheel support plate high position, securing a high, unobstructed working space under the vehicle and yokes are used to secure a small forward inclined position of the wheel support plate, while the vehicle lifter is being raised or lowered.

Abstract: A scissor-type snowmobile lift comprised of first and second cross members, rails, a pair of scissor members, two mounting brackets, a lower cross member and a hydraulic cylinder. The rails and first and second cross members form a lift frame. The first and second cross members are spaced so they contact the bellypan of the snowmobile. The rails are spaced so that the snowmobile track lies between the rails. The snowmobile is placed or driven onto the lift frame. As the lift frame is raised, the first and second cross members contact the bellypan and the rails contact the frame or running boards of the snowmobile, causing the raising of the snowmobile while keeping the skis and tracks free of the lift frame for maintenance and repair.

Abstract: A simplified, convenient and compact multi-storied parking and/or displaying rack being collapsible and movable is provided. The rack includes at least two vertically spaced parking/displaying members each of which includes a first end, two opposite sides and a second end, at least a vertically moving mechanism mounted between the two members for moving them apart from or toward each other, and at least a positioning mechanism mounted on the moving mechanism and capable of holding the two members in a vertically spaced relationship.

Abstract: A platform car includes a base frame, a platform, and two X-shaped members respectively disposed along both sides of the base frame. Each X-shaped member is comprised of a first bar having a first end pivotally attached to the base frame and a second end slidably received in an associated groove in the platform and a second bar pivotally connected to the first bar at a middle portion thereof with a first end thereof pivotally attached to the platform and a second end thereof slidably received in an associated groove in the base frame. A handle is mounted on the base frame for manually operating a piston rod of a cylinder. An actuating member is securely attached to and actuatable by the piston rod. A pair of connecting members each with a first end thereof pivotally attached to the actuating member and a second end thereof securely attached to a lower part of associated first bar of the X-shaped member.

Abstract: The invention relates to a device for initiating a lifting movement in a lifting mechanism, for instance in lifting tables, of the type of which includes at least one first lifting arm (3) and one second lifting arm (4) being articulatedly interconnected by means of a first joint (10). The lifting mechanism also includes a force applying means (5) acting on one of the lifting arms, the force applying means (5) and the lifting arms (3, 4) in the initial position, before the initiation of the lifting movement, being oriented generally parallel with respect to each other in a common plane in order to achieve a low constructional height of the lifting mechanism.

Abstract: A nonmetallic automotive jack includes a scissors assembly which is mounted on a base. The base includes a floor which flairs outwardly in a forward portion and outwardly in a rearward floor portion. The forward floor portion is longer than rearward floor portion. Inner side flanges are disposed upwardly from the base floor between the forward floor portion and the rearward floor portion. Perpendicular buttresses reinforce the inner flanges. The base has a multiplicity of tines that provide gripping traction for the base. The jack may be made of all plastic components or some combination of plastic and metal parts.

Abstract: This invention relates to improved dollies for lifting and moving heavy objects such as furniture, refrigerators, and the like. It comprises a base plate having four casters with a top plate mounted thereabove. The top plate can be elevated via a pedal-actuated lever and link mechanisms to raise the load off the floor for movements and then lower it down. The invention includes a telescopic mechanism for adjusting the top plate with respect to the base plate and a spring to bear the main weight of the load to be moved. The lifting lever can be folded out of the way for load movement where clearance is a problem.

Abstract: A mechanical jack comprising a base with wheels attached thereon for moving the jack, a primary arm of which an end is pivoted on the base so as to be rotatable with respect to the base, a secondary arm of which an end is pivotally mounted approximately on the middle of the primary arm so as to be rotatable with respect to the primary arm, and a threaded rod threadingly connecting between the free ends of the primary and secondary arms so that when the threaded rod is rotated, the free ends of the primary and secondary arms move towards or away from each other, depending upon the rotation direction of the threaded rod. With the pivoted ends as the rotation centers, moving the free ends of the arms will also heighten the free end of the secondary arm so as to lift a vehicle supported thereon.

Abstract: Device for the curved displacement of an object in contact with a surface, such as a convex, concave or complex surface, comprising a vertical support frame, arranged in the vicinity of the surface, and a bearing arm consisting of at least one pantograph, one end of which, integral with the vertical support frame, can be displaced over the height of the latter, and the other end of which carries the object to be displaced at an appropriate distance from, and out of contact with, the surface, wherein at least one of the hinge pins of the arm of the pantograph is displaced, with the movement of the arm relative to the frame, in a groove whose profile is homothetic with that of the surface, and situated in a vertical plane containing the pantograph arm.

Abstract: A scissor jack of the type which is mountable on and usable in conjunction with a conventional automotive vehicle lift to permit a selected axle of the vehicle to be elevated relative to the lift. The invention provides a gravity activated locking mechanism which includes a plurality of lock keys of different widths. The keys fall individually into a lock position as the jack rises incrementally in height, to prevent unintended lowering of the jack at any height or any time during the lifting process.

Abstract: An elevating stage that can be raised by a power drive comprises scissor beams of lifting scissors which are bent in the middle at an upward pointing angle of bend. The moving joints of the scissor beams are offset laterally within respect to one another in such a manner that the scissor beams lie one on top of the other and the sides of the scissor diamonds generated when the lifting scissors are extended out have different lengths.

Abstract: An adjustable support device comprising a first elongated member having an upper end, a second elongated member having an upper end, a mechanism for connecting the first member to the second member such that the upper ends of the first and second members are vertically, adjustably movable in response to movement of the first elongated member with respect to the second elongated member, and a ratch connected between a first point located on the first member and a second point located on the second member for releasably securing the first and second points in spaced relationship and for selectively varying the spacing between the first and second points.

Abstract: A hydraulic lift mechanism for raising and lowering heavy loads such as a camper shell above the cargo area of a truck includes a generally planar U-shaped lower base frame attachable to the truck and a substantially identical plan-view shape upper load support frame for attachment to the camper shell or other load. Two identical X-shaped scissors jack-like, lifting structures comprised of two crossbeam members pivotably joined to one another at their centers, and pivotably joined at their forward ends to vertically aligned positions in an upper and lower side frame member, are spread apart by a hydraulic powered cylinder pivotably fastened at one end to a side rail of the base frame and pivotably fastened at the other end to a crossarm, to raise the load support platform.

Abstract: A mechanism for automatically preventing a motor vehicle from dropping from a wheels support plate of a lifting apparatus of a system for lifting the vehicle for repair thereof comprises (i) a barrier wall connected to one end portion of the support plate along a width direction thereof for pivotal movement between a vertical position and a horizontal position which is on the support plate, (b) positioner for maintaining the barrier wall in the vertical position when the support plate is not in a lowest position, so that if a motor vehicle driven onto the support plate from a direction opposite to said one end portion of the support plate and supported thereon should accidentally move forward, the barrier wall engages a front wheel of the vehicle to prevent the vehicle from dropping from said one end portion of the support plate, and (c) leveler which brings the barrier wall down to the horizontal position when the support plate has been moved to a lowest position.

Abstract: A medical diagnostic couch assembly for a patient undergoing medical diagnosis includes a base, a couch on which the patient reclines and a mounting frame for slidably supporting the couch. The mounting frame includes a longitudinally extending slot and a pair of parallel vertically spaced hard metal wear strips, one secured to a respective top and bottom surface of the slot. The couch includes at least one rail cover for enclosing the slot to retard the deposition of dirt and grime therein. The couch further includes at least one roller rotatably mounted to the rail cover wall so as to extend into the slot and between the pair of wear strips. A scissors structure supports the mounting frame. The scissors structure includes a first leg and a second leg with each of the legs being rotatably secured at a first end to the base and at a second end to the mounting frame. The two legs are also secured together at an intermediate portion of each leg.

Abstract: A device for raising and lowering a transfer step provided at one end of a vertically movable table in a lift includes a lug projecting from the step and an axially movable rod extending along the table and having one end linked to the lug. The rod has a laterally projecting pin near the other end thereof located remotely from the step. A handlebar is rotatably supported near the other end of the rod. A pin driving member is connected to the handlebar rotatably therewith and has a slot in which the pin is slidably fitted. The slot extends radially of the axis of rotation of the pin driving member. When the handlebar is rotated to rotate the pin driving member, the pin slides along the slot to cause the axial movement of the rod to rotate the step from one of its raised and lowered positions to the other.

Abstract: A power-operated lift, adapted to be mounted in a vehicle trunk has linkage means for raising a load-supporting platform in a vertical direction. The platform can be manually moved in a horizontal direction to remove the load from the trunk. The platform can be pivoted about the frame to provide access to a wheel well beneath the lift. A reversible motor is connected to the linkage for either raising or lowering the platform with respect to the trunk floor.

Abstract: Arrangement for a lift adapted to a motor vehicle, comprising a lifting platform capable of moving between the vehicle and a floor. The invention provides a simple device for achieving a reliable and efficient lift arrangement, for example, for use by individuals in wheelchairs who wish to move between the inside and the outside of a vehicle without the help of an assistant, and without additional ramp or lift arrangements. The platform is attached via a scissor mechanism to a source of power for the platform, so that the platform, upon actuation of the power source, moves between a lower and an upper position, one of which at least is situated at a different level with respect to that of the attachment of the scissor mechanism to the source of power.

Abstract: Lifting equipment 4 for turning a four-wheeled vehicle on the spot to facilitate maneuvering, which equipment can be driven mechanically, pneumatically, hydraulically or electrically, is arranged at the underside of the vehicle and comprises a spindle-driven jack with a ground-engaging member 22. The jack is so positioned that the supporting moment provided by the member acts on the vehicle longitudinal centre line but is offset relative to the vehicle centre of gravity 3. The offset is such, in the case of a vehicle with front wheel or four wheel drive, that the rear wheels are lifted off the ground and the jack carries 60 to 80% of the vehicle weight, the partially relieved front wheels carrying the rest of the weight. Transmission of drive to the turned front wheels in this state results in the pivoting of the vehicle about the member, with the driven front wheels spinning or slipping against the roadway.

Abstract: An adaptor for a jack having a threadable jack shaft and a support platform that rises or lowers when the threadable jack shaft turns.The adaptor has a housing containing a drive motor that is coupled to a drive shaft. The adaptor has an engagement bracket for engaging releasably the adaptor to the jack. Spring loaded bolts bias the engagement bracket against the face of the housing. A jack and adaptor in combination and a method for operating a jack having support aligning bars wherethrough a threadable jack shaft rotatably passes to raise or lower a support platform of the jack upon rotation.

Abstract: A power-operated lift and presenting mechanism has a base structure that is placed on the floor of an automobile. A carriage moves between an elevated position and a lowered, transport position when a lift assembly causes the carriage and base structure to be separated and brought closer together. The lift assembly is selectively power operated by a reversible electrical motor to expand to separate the carriage from the base structure and to contract to bring them closer together. The carriage has a track and track follower and a platform mounted on the track follower so that the platform is movable to and fro along the track. The platform is capable of supporting heavy and bulky articles. The platform is movable along the track when the carriage is in an elevated position, between a retracted position in which the platform is generally over the base structure and within the trunk, and a presenting position in which the platform extends out from over the trunk generally out of the trunk.

Abstract: A height-adjustable table for supporting a patient during medical examination or treatment in which a patient support table top mounted on a carrier 2 is connected to a base 3 by a parallelism maintaining linkage comprising a diamond or rhombus shaped linked assembly of four mutually pivoted equal struts 6, 7, 8, 9, pivotally attached top and bottom to the carrier 2 and to the base 3, and intermediately to the centers of first and second struts 17, 18 which are attached at their ends for free rectilinear displacement, to slides 20, 22, 24, 26, mounted on the carrier 2 and the base 3. Inextensible diagonal links 30, 32 connect diagonally opposed slides 24, 22 and 20, 26, to form an assembly of good horizontal and vertical stiffness even at the maximum height adjustment which is effected by e.g. a screw jack 5.

Abstract: A safety device for a jacking system comprising a plurality of jacks which are designed for simultaneous operation, at least one table supported on the jacks, and a mechanism connecting the jacks for their simultaneous operation. Each jack is provided with a hydraulic or pneumatic cylinder for moving the jack to raise and lower the table, a pawl and rack mechanism which is normally held in its engaged position for holding the table in its raised position, and an AC solenoid connected to the pawl and rack mechanism for moving it to its disengaged position to allow the table to be lowered. The device includes a resistor connected in series to the solenoid. An integrating circuit is connected in parallel to the resistor, includes a capacitor and produces an electrical signal indicating any failure of the pawl and rack mechanism to be moved to its disengaged position. A relay is connected in parallel to the capacitor for operation in response to the signal to stop any lowering motion of the cylinder.

Abstract: The scissor lift has two parallel sets of legs. Each set has one end of an inner leg pivoted on a base and the other end slideable on the elevating platform. One end of the outer leg of each set is pivotally connected to the platform while the other end slides on the base. The mid portion of the legs are pivotally connected on a pin which also supports a crank which can rotate about 90.degree. between a first generally horizontal position in which the actuated end of the crank is eccentric to an imaginary line connecting the pivot pin and the pivot of a ram which actuates the end of the crank. Initial actuation of the crank 90.degree. raises the pivot pin and the actuated end of the crank to increase the mechanical advantage of the ram. The angle of the ram now has adequate uplift to be as effective as the prior art while requiring about 1/2 the storage height. A stop bar is pivoted on the pivot pin and has a free end or tail slideable along the base as the pivot pin rises.

Abstract: Cargo-transporter, particularly of the trailer type, having a loading floor, in which a loading floor portion situated directly behind another elevated loading floor portion but in front of the wheel assembly, includes a lifting platform having a lifting height corresponding to the difference in the loading floor levels. An apparatus for guiding and lifting the platform is accommodated in a space below the platform. The transporter is of the self-supporting type. The lifting platform is vertically movably guided and has a length substantially corresponding to the length of the elevated loading floor portion. A guiding and elevating apparatus is accommodated in a cup-shaped housing secured against a transporter bottom and having a height corresponding to the lifting height of the platform. The lifting platform is provided at its end edge remote from the elevated loading floor portion with a downwardly extending skirt extending in the lowered position of the lifting platform to be adjacent the housing bottom.

Abstract: An elevating device for a workman's platform in which a single lift cylinder is utilized, positioned below the lift arms when the arms are in their fully retracted or lowered position. A piston of the cylinder is operatively connected to one of the lift arms, with the opposite end of the cylinder being operatively connected to one end of a pivot arm assembly which is mounted for rotation about a fixed axis on the base. The opposite end of the pivot arm assembly carries a roller which is adapted to engage the cam surface of a cam plate mounted on the same lift arm. When the lift cylinder is actuated, the piston functions to raise the lift arm at its connection point to the piston, simultaneously with the rotation of the pivot arm assembly and the consequent lifting of the cam roller against the cam surface thereby elevating the arm at that location as well.

Abstract: An infant incubator mattress positioning assembly having a pair of lift mechanisms spaced apart on the deck of the incubator. Each lift mechanism includes a scissor linkage which is operated by a lead screw mechanism. The mattress tray, positioned on the free ends of the links of the scissor linkages, is moved by turning a crank in the lead screw mechanism of each lift mechanism.

Abstract: A lifting unit with an incorporated piezoelectric transducer comprises an extendable trolley (1-4) with a frontwardly tapered plan profile and is upperly provided with a flat vertical compass structure (5) which is symmetrically disposed about the main axes of the underlying trolley (1-4) and has its arms converging towards a horizontal box member (6) containing a piezoelectric transducer (15), at which the arms are linked together and at which there is provided, above the box member (6) a positionable lifting and support saddle (21) which is disposed transversely to the flat vertical compass structure (5).

Abstract: A mechanism to be used on vehicles' chassis for lifting loads and including scissor-action means that are distensible by applying hydraulic force to its structural members. The mechanism includes a safety linkage assembly for connecting the piston rod of the hydraulic cylinder to the structural members that are pivotally mounted to the chassis. The linkage mechanism prevents slipping of the rod under drastic load changes.

Abstract: A scissor mechanism is provided with two scissor arms (1,2) and a hydraulic cylinder (12) which extends between engagement points on the scissor arms (1,2) which are offset from the common bearing (3) of the scissor arms. Between the scissor arms there is provided a wedge mechanism (18,19) comprising a pressure roller (18) and a pressure wedge (19). The pressure roller (18) is mounted on a displaceable sleeve (15) which serves as the engagement point for the hydraulic cylinder at one of the scissor arms (1). By displacement of the sleeve (15) the scissor arms (1,2) are wedged out of their originally parallel position (FIG. 1).

Abstract: A jacking device, which is, for example, used for lifting a motor vehicle when repairing it, includes at least one jack installed in a floor pit and including at least two horizontally spaced apart parallel pairs of links which are designed for simultaneous movement in two parallel vertical planes, respectively. A mechanism is associated with the links for moving them vertically. A table is horizontally supported on the links for lifitng e.g. a motor vehicle. Each pair of links consists of a first link and a second link which are so connected to each other as to form an X-shaped assembly when they are raised to raise the table. The first links in those two pairs of links are parallel to each other, and the second links are also parallel to each other. The links and the link moving mechanism are foldable into the pit when the table is lowered to close the pit.

Abstract: A jack as provided for use with a lifting device having two parallel support platforms. The jack has base and top elements, and a scissor mechanism between them. Two air piston and cylinder assemblies are disposed vertically and actuate the scissor mechanism. The jack is mounted for free movement along the length of a lifting device. The piston and cylinder assemblies can be connected to mid points of the arms of the scissor mechanism on either side of it. This provides a compact assembly with the piston and cylinder assemblies working at an optimum angle. The base element of the jack includes openings for the piston and cylinder assemblies.

Abstract: A height adjusting mechanism for a physical therapy bench has great lifting height due to levers extending at an angle with each other in one end position which are made to coincide approximately midway in their movement, said movement being permitted to continue in said levers passing each other and in their other end position again extending at an angle with each other.

Abstract: A safety device which prevents any one-sided lowering motion of a jacking system including a plurality of jacks which are designed for simultaneous operation, and a mechanism connecting the jacks for their simultaneous operation. Each jack includes a first hydraulic or pneumatic cylinder for raising and lowering a table, a substantially vertically disposed rack mechanism, a pawl mechanism which is normally engaged with the rack mechanism to hold the table in a raised position, and a second pneumatic or hydraulic cylinder for disengaging the pawl mechanism from the rack mechanism. The safety device includes a plurality of valves each provided in one of the jacks and operable by a pushbutton to produce a fluid presure signal when the pushbutton has been depressed. A mechanical actuator is provided in each jack for depressing the pushbutton when the pawl mechanism has been disengaged from the rack mechanism.

Abstract: Lifting apparatus comprises a base, a platform disposed above the base, a thrust mechanism therebetween to lift the platform with respect to the base, and a platform stabilizer assembly enclosed within the thrust device to connect the platform and base in a fixed relationship with respect to each other. The platform stabilizer assembly comprises an upper extensible, scissors linkage mechanism having upper end portions connected to the platform and a lower extensible, scissors linkage mechanism having lower end portions connected to the base. The lower end portions of the upper extensible, scissors linkage mechanism are pivotally connected to upper end portions of the lower extensible, scissors linkage mechanism so that the scissors linkage mechanisms are constrained to move in unison. Guides located on the base and platform outside and adjacent the platform stabilizer assembly constrains movement of the stabilizer linkages within the thrust mechanism.

Abstract: A vehicle leveling and stabilizing apparatus particularly adapted for use with a motor home to level and stabilize the vehicle upon irregular terrain preparatory to camping or such activity. The apparatus includes a plurality of jack stand assemblies, one associated with each vehicle quadrant. The jack stand assemblies are operated by double-acting hydraulic power units operable from the cab of the vehicle. Level sensors are connected to the motor vehicle to indicate level or off-level condition from front to rear and from side to side. A control panel within the vehicle carries the power unit controls and level indicators lamps.

Abstract: A scissor jack has a leg having a lower end adapted to bear on the ground, a support arm having a lower end pivoted on an opposite upper end of the leg at an intermediate horizontal axis, and a load-bearing member engageable with the vehicle body and formed on an opposite upper end of the intermediate support arm. Upper and lower links are pivoted together at another intermediate horizontal axis with the upper link also pivotal on the support arm between the ends thereof at an upper horizontal link axis and the lower link also pivotal on the leg between the ends thereof at a lower horizontal link axis. A jack screw is connected between the intermediate axes and can draw the intermediate link axes toward one another to raise the load-bearing member or separate the intermediate link axes to lower the load-bearing member. A foot piece can rock on the lower end of the leg relative to the ground about a lower horizontal foot axis as the leg is raised and lowered.

Abstract: The present invention relates to an arrangement for a hydraulic lifting table of the scissor type with at least two pairs of scissor arms (1, 2) pivotally attached to one another. These are attached at their ends to a lower frame section (3) and an upper table section (4) in such a way as to be capable of pivoting and rolling. The arrangement also comprises a centrally positioned power transmission arrangement pivotally attached to the frame section, being preferably a hydraulic cylinder, the piston rod (8) of which is so arranged as to engage via rollers (9) with guide curves (10, 11). One (10) of these is attached to the frame section (3), and the other (11) is operatively connected to a pair of scissor arms (1). The guide curves (10, 11) are moved towards and away from one another by the rollers (9) for the purpose of raising the lifting table and vice versa.

Abstract: A lifting device comprises a fixed lower frame, an upper frame vertically movable with respect to the fixed frame and provided with members supporting the desired portions of the vehicle to be raised, articulated rods systems connecting the lower and upper frames, a mechanical energy generator placed between the articulated rods systems and acting on these so that to cause the raising of the movable frame with respect to the fixed frame, and a torsion bar connected to the fixed frame and acting on the movable frame in order to ensure its precise lifting.

Abstract: A motorized user applied actuator for automobile and like jacks having rotatable operating members for raising and lowering the jack platform, comprising a casing having a drive member detachably cooperable with the jack operating member, and having an electric motor and a unique, compact and lightweight, simple yet highly efficient step-down transmission connecting the motor with the drive member. The transmission comprises a plurality of staged planetary assemblages which effect a great reduction in speed and advantageous conversion of power. In several illustrated embodiments of the invention one or more handles are attached to the motor casing to provide a convenient hand grip. In another form of the invention the hand grip is supplemented by a fitting which separably interlocks with the jack structure to assume the torque on the motor casing. A power cord for the actuator has a plug adapted to be received in the cigar lighter socket of a motor vehicle.