Abstract: Represented and described is a lifting device having a housing, a lifting spindle that is cylindrical and has an external thread on the outer surface, a threaded bush that surrounds the lifting spindle and has an internal thread that is in engagement with the external thread and a drive unit for the rotating drive of the threaded bush, wherein the lifting spindle is mounted in the housing so as to be displaceable in its axial direction and non-rotatable. The object to provide a lifting device that has as short an installation length as possible in the axial direction of the lifting spindle is achieved in that the lifting spindle is in the form of a hollow cylinder, in that a dome is located in the interior of the lifting spindle and is connected in a non-rotatable manner to the housing and in that the lifting spindle is mounted on the dome so as to be non-rotatable and axially displaceable.

Abstract: An actuator comprises a gear arrangement operatively connected to a rotatable input of a linearly extendable actuator device, wherein the gear arrangement comprises a pinion gear and a face gear in meshing engagement with one another.

Abstract: A height adjusting mechanism suitable for a keyboard is provided, and the keyboard is placed on a flat surface and has a casing. The height adjusting mechanism includes a fixing piece, a cylinder, a first gear and a second gear. The fixing piece is disposed on the casing and has a container and at least a supporting part that extends into the container. The cylinder has at least a spiral guide on its sidewall and the supporting part slides along the spiral guide when the cylinder rotates. In addition, the first gear is assembled to the cylinder so that the first gear and the cylinder can rotate simultaneously. The second gear and the first gear are meshed with each other so that the second gear can drive and rotate the first gear to adjust the relative distance between the casing and the bottom of the cylinder.

Abstract: The present invention relates to a supporting structure capable of vertically elevating, comprises a pair of retracting devices, a base seat and a supporting device; by applying a force to the pair of retracting devices, the elbow joint section disposed at a pivotal connecting location between the top and the bottom rotation sheets is inwardly or outwardly moved, thus the top and the bottom rotation sheets correspondingly close or away from each other, so it can be ensured that the height of the supported objected is vertically adjusted without occupying too much space; and the present invention provides a function of vertically elevating, so problems that a base seat has to be pivotally connected to at the rear portion due to the forward/backward movement of the supported object has overcome and the appearance of the base seat can be styled to enhance the artistic sensation.

Abstract: A vehicle lift system includes a vehicle with a power supply port. A housing has a bottom wall, a top wall and a peripheral wall. A sleeve extends upwardly from the housing. A piston is mounted in the sleeve. A drive assembly is mechanically coupled to the piston. The drive assembly is actuated in a first direction to raise an upper end of the piston with respect to the housing. The drive assembly is actuated in a second direction to lower the upper end of the piston with respect to the housing. The drive assembly is removably coupled to the power supply port to supply electrical power to the drive assembly. A plurality of engaging members is provided. One of the engaging members is removably attached to the upper end of the piston and engages the vehicle which the piston is raised.

Abstract: An extendible and retractable actuator comprises a motor, two screws and an extendible and retractable sleeve assembly. The motor cooperates with the screws to drive the extendible and retractable sleeve assembly to extend and retract simultaneously, so as to reduce the extending and retracting time and to simplify the structure of the extendible and retractable actuator.

Abstract: This Utility Model Invention discloses a lifting mechanism for players, including the main body frame and the player installed on the main body frame. The bottom of the said player is fixed on the connection dock, while the connection dock is connected with a worm coupling support. Inside the main body frame is installed the worm shaft, and the worm coupling frame is coupled with the worm shaft. At the bottom of the said main body frame is installed the gearbox base, and in the gearbox base is installed gear cluster and motor. The bottom end of the worm shaft is connected to the motor via the said gear cluster. This utility model features the maximum protection of the player from being damaged as well as keeping integrity and good appearance of the whole product.

Abstract: An electronic jack for lifting heavy objects, such as a portion of a vehicle is described. The electronic jack has an outer casing that houses a motor, a hydraulic system, and a hydraulic lift unit that is activated by the hydraulic system. The motor is preferred to be a twelve volt electric motor and can be electronically connected to a vehicle through a cigarette lighter adapter.

Abstract: A motor drive for camper jacks or screw jacks that rapidly operates the screw jack between a retracted position and an extended no load position. A manual operator then operates the screw jack between the extended no load position and an extended loaded position. The motor drive and manual operator share a right angle gear mechanism.

Abstract: Remotely-adjustable support apparatus and methods are disclosed. In one embodiment, an apparatus includes a primary support and a secondary support moveably coupled to the primary support. The secondary support includes a cradle member adapted to engage the workpiece. The apparatus further includes a drive assembly operatively coupled to the secondary support and adapted to move the secondary support relative to the primary support. A control device is remotely positionable with respect to the drive assembly and operatively coupled to the drive assembly. The control device is adapted to transmit at least one control signal to the drive assembly to move the secondary support relative to the primary support.

Abstract: A rotatable cylinder, a threaded cylinder and a center threaded rod are sequentially inserted in their mutually threadingly engaged states in the inner side of a guiding inner cylinder part which is vertically disposed at the case body through an inner periphery thread and an outer periphery thread. A large bevel gear disposed at a lower end part of the rotatable cylinder is threadingly engaged with a small bevel gear which is borne by the case body, a thrust bearing having a large inside diameter is sandwiched between the large bevel gear and a bottom plate of the case body, and the center threaded rod is provided at its upper end face part with an engagement part for preventing the rotating motion of the center threaded rod when engaged with a jack attachment part of a body to be lifted up such as an automobile.

Abstract: A battery driven reversible motor and speed reduction gear assembly coupled to a worm-screw scissor jack, all mounted on a flat, stable platform (base plate) for use in raising and lowering the corner of a vehicle. The device can be powered from a rechargeable battery pack or from the vehicle's battery. A controller unit extended by means of a cable is used to raise and lower the vehicle while the user stands out-of-the-way in safe location. The device also has a light for illuminating the work area for nighttime application. In use, the lift plate on top of the scissor-jack is placed under the frame or axle of the vehicle close to the flat tire and the power switch is turned ON. The user then walks away from the vehicle, with the controller unit in his/her hand, to a safe distance.

Abstract: Disclosed herein is a mechanical screw jack comprising: a housing; a mechanical jack stroke limiting nut connected to the housing, the nut having a nut wall, the wall defining an interior female threaded surface and an interior screw travel limiting surface located adjacent to the interior female threaded surface; and a mechanical jack screw having an externally threaded male surface for threadably engaging the interior female threaded surface of the mechanical jack stroke limiting nut and a disruption; wherein the unthreaded screw travel limiting surface is capable of interferingly engaging at least a portion of the disruption to prevent over travel of the threaded screw. A method of limiting screw travel in a mechanical screw jack is also disclosed. Advantageously, screw travel is limited such that a user can over torque the screw, such that the screw can travel with respect to the nut without damaging the threaded portion of the nut.

Abstract: An apparatus for assisting in the operation of a conventional trailer jack. The jack assistance apparatus is attached to a conventional trailer jack having telescoping tubes with a coarse adjustment and a fine adjustment. The apparatus includes a lever arm that engages a locking pin handle on the jack, and a guide tube that contains a chain or other flexible member with one end attached to the jack base and the other attached to a handle. The lever arm and handle are located for convenient access by an operator for coarse vertical adjustment of the jack.

Abstract: A headlamp for an automobile includes a lamp body, a light source, a reflector, and an aiming mechanism. The aiming mechanism includes a screw insertion hole and an aiming screw operable to move the reflector by pivoting the aiming screw. The aiming screw includes a supported portion supported by the screw insertion hole, a male screw portion forward from the supported portion, and a pivotal movement operating force transmitted portion rearward from the supported portion. A front end side of the supported portion includes an elastic locking portion operable to pass through the screw insertion hole by being deformed elastically to an inner side in a radial direction, and a rear end side of the supported portion is integrally formed with an elastic rib brought into press contact with a peripheral edge portion on a rear end side of the screw insertion hole to fixedly position the aiming screw.

Abstract: A lightweight, portable jack for a wheeled vehicle is provided. The jack includes a high-torque electric motor adapted to use the electric power supply from the vehicle through electrical connectors connectable to the terminals of the vehicle battery or through use of an electrical connector which may be plugged in to the cigarette lighter receptacle. The jack is fully movable from a recessed position within a low profile casing and is operated by a remote control device so that it can lift the wheel of a vehicle from an operator position well out of the path of traffic or, if desired, from inside the vehicle. The jack disclosed is of lightweight construction so that it can be removed from storage and positioned by practically any vehicle operator.

Abstract: A jack includes a motor, a gear assembly operably connected to the motor, a ram, and a plurality of screws driven by the gear assembly to move the ram.

Abstract: A motor-operated jack for vehicles includes a lifting unit, which includes a spiral lifting ram having an internal thread limitedly formed at a lower portion of the spiral lifting ram, and a pin held in a horizontal groove formed at the top end of a primary screw. This pin is slightly projected into two longitudinal holes symmetrically formed at the top portion of a secondary screw. There is also a coil spring, a spring cover and a snap ring sequentially laid on the top of the pin. There is also a support ram, having a top support and an external thread, movably fitted in a gap between the secondary screw and the spiral lifting ram while engaging with an internal thread of the spiral lifting ram at the external thread, thus allowing a user to control the moving stroke of the lifting unit as desired.

Abstract: A hollow housing of a screw-type jack is integrally formed by a press. A ram is mounted in the center portion inside this housing in an axial direction to be extendable/contractible in a vertical direction. A drive mechanism mounted in the housing, for extending/contracting this ram in the vertical direction, and in which the housing includes a cylindrical shaft portion protrudingly disposed on a lower part of a side surface of the housing. A drive gear is pivotally and rotatably supported in the cylindrical shaft portion. The housing is made up of a plurality of housing pieces which are vertically divided portions of the housing. The housing pieces are mechanically joined to each other to form the housing. The housing pieces are divided in a vertical direction cutting though the axis of the cylindrical shaft portion. Joining of the housing pieces can use rivets or joining pieces can be swaged over protruding flanges.

Abstract: An electromotive adjustment assembly, includes at least two spindles, each spindle carrying a spindle nut, with both spindle nuts secured against executing a rotation movement. A motor unit is positioned between the spindles and coupled in driving relationship with the spindles for rotating the spindles, whereby the spindles are secured against displacement in longitudinal direction. Connected, directly or indirectly, to the spindle nuts are flexible pull strands which are trained over deflection rollers for attachment with their free ends to profiled lifting members which are secured at an angle to a structure to be adjusted.

Abstract: The present invention relates to a screw jack that has a thin metal bearing for supporting a main screw shaft of a jack body to lift the jack body high as possible so that a torque increase can be kept to a minimum. For this purpose, the metal bearing is mounted and configured to have a substantially large outer diameter, and also a small stepped sliding-surface is formed on the top or bottom surface of the metal bearing.

Abstract: A hollow housing of a screw-type jack is integrally formed by a press. A ram is mounted in the center portion inside this housing in an axial direction to be extendable/contractible in a vertical direction. A drive mechanism mounted in the housing, for extending/contracting this ram in the vertical direction, and in which the housing includes a cylindrical shaft portion protrudingly disposed on a lower part of a side surface of the housing. A drive gear is pivotally and rotatably supported in the cylindrical shaft portion. The housing is made up of a plurality of housing pieces which are vertically divided portions of the housing. The housing pieces are mechanically joined to each other to form the housing. The housing pieces are divided in a vertical direction cutting though the axis of the cylindrical shaft portion. Joining of the housing pieces can use rivets or joining pieces can be swaged over protruding flanges.

Abstract: The present invention relates to a screw jack that has a thin metal bearing for supporting a main screw shaft of a jack body to lift the jack body high as possible so that a torque increase can be kept to a minimum. For this purpose, the metal bearing is mounted and configured to have a substantially large outer diameter, and also a small stepped sliding-surface is formed on the top or bottom surface of the metal bearing.

Abstract: A motor-operated jack for vehicles is disclosed. In the motor-operated jack of this invention, a lifting unit consists of a spiral lifting ram having an internal thread limitedly formed at a lower portion of the spiral lifting ram, thus reducing its frictional resistance. A pin is held in a horizontal groove formed at the top end of a primary screw. This pin is slightly projected into two longitudinal holes symmetrically formed at the top portion of a secondary screw. A coil-spring, a spring cover and a snap ring are sequentially laid on the top of the pin such that the snap ring is seated in an annular groove formed on the inner surface of the top wall of the secondary screw, thus allowing the coil spring to bias the pin. This second screw is thus prevented from being raised along with the spiral lifting ram.

Abstract: A jack assembly for raising and lowering an object such as a trailer. The jack includes telescoping jack tubes which are expanded and contracted through operation of an axial screw. The screw is drivably connected to a gear drive mounted in an upper end of the jack. A crankshaft is supported within the upper end of the jack tube by a pair of end bushings and includes a hexagonal intermediate portion. A first pinion gear having a hexagonal throughbore is drivably mounted to the intermediate portion of the crankshaft. The first gear is in driving engagement with a screw gear connected to the axial screw. At least one of the end bushings is removable to facilitate disassembly of the gear drive. Rotation of the crank transmits rotation to the crankshaft and the first pinion gear in turn transmitting rotation to the screw gear and the axial screw for telescoping movement of the jack.

Abstract: A directly driving electromotive jack device for releasing a torsional force comprises a jack with a driving screw rod, an electromotive motor arranged with a deceleration gearbox, a torsional force releasing means directly connected to a positioning plate and the jack, a power supply directly switch operable by an operator. The torsional force releasing means serves to connect the electromotive motor with the jack. The torsional force releasing means comprises a positioning plate for fixing the electromotive motor; two or more than two symmetric arms of torsional force; a bearing for being passed through the electromotive motor; and a switch connected to the driving screw rod. The electromotive motor is fixed to the positioning plate by a plurality of studs. The arms of torsional force serve to connect the positioning plate with pivotal shafts of the jack. The rotary shaft of the electromotive motor and the driving screw rod are positioned in a same central line.

Abstract: A load directing trunnion mount for a linear actuator is constructed to receive all of the tensile forces exerted on the actuator shaft or lead screw of the linear actuator. In this manner, the load directing trunnion mount relieves a transmission drive element (for example, a drive gear or a sprocket or pulley) and the transmission housing enclosing the drive element from tensile forces exerted on the actuator shaft during use of the linear actuator.

Abstract: An anti-backlash nut assembly (10) has a first part (12), a second part (14), and at least one drive pin (16) to rotationally couple the second part to the first part while permitting axial movement therebetween. The first part includes a collar portion (30) having an inner circumferential wall (34) having at least one axially extending drive pin recess (38) therein. The second part includes a boss portion (54) having an outer circumferential wall (56) having at least one corresponding drive pin recess (60) therein. The boss portion is adapted for sliding engagement with the collar portion and is received therein. The at least one second part drive pin recess is circumferentially aligned with the at least one first part drive pin recess to define a drive pin channel (70). At least one drive pin is slidingly engaged in the at least one drive pin channel. In a preferred embodiment, the first part is a worm gear and the second part is an anti-backlash nut.

Abstract: The vehicle jack comprises a support having a base plate and a cap bordering together an interior space. The latter contains a bevel gear with a first gearwheel rotatable about a first, inclined axis and a second gearwheel rotatable about a second, vertical axis. The base plate and the second gearwheel comprise annular guiding and rolling surfaces guiding together a set of rolling bodies, viz. balls, so that the base plate, the second gearwheel and the rolling bodies form together a rolling bearing. The base plate and the gearwheels are formed of sheet metal members. The shapes of said annular guiding surfaces and of the teeth of the gearwheels are defined substantially by plastic, non-cutting shaping. The jack can be light and can be manufactured and assembled at low costs.

Abstract: The invention concerns a device making it possible to firstly limit the dynamic or static force applied to a linear electric jack with a reversible screw/nut system, and secondly translation-disengage the screw of the jack. This device is formed of an element (2) integral with the screw (7) of the jack and an element (1) integral with the activated load and interconnected by a friction system (3). The force applied on the screw (7) tends to make the latter rotate inside the screw (8) of the jack. This rotation is stopped by the friction system (3) until the latter slides and separates the elements (1) and (2). The screw (7) then rotates with respect to the element (1) which limits the force. The replacement of the friction element (3) by a coupling makes it possible to externally control the rotation and translation of the screw (7). The end of travel stops (13) secured to the screw (7) rotate with this screw whilst retaining their characteristics.

Abstract: A loaded vertically operating ball screw and nut actuator system, including methods of constructing it, for synchronously moving load systems connected to it in opposite vertical directions has a vertically disposed rotatably driven ball screw device with screw sections of opposite hand. A complemental recirculating ball nut discretely connected to each of the load systems is threaded on each screw section to form ball receiving raceways for trains of load bearing balls which cause the ball nuts to move in opposing directions upon rotation of the screw in either direction. The load systems move in counterbalanced relation under the influence of gravity. A mount system for the upper and lower ends of the screw permits an off-axis adjustment in axial orientation of the screw to compensate for load misalignment problems.

Abstract: A motorized jack for reducing the amount of labor needed to lift up a vehicle. The motorized jack includes a housing with a motor provided in the housing. A threaded shaft is also provided in the housing. A top end of the threaded shaft is upwardly extended through a hole in the top of the housing. A ring gear is disposed around the threaded shaft. The ring gear has a toothed inner perimeter engaging the threaded shafts. An interconnected set of gears is provided in the housing to connect the ring gear to a rotating shaft of the motor. A lifting head is coupled to the top end of the threaded shaft.

Abstract: An adjustable lifting apparatus preferably for applications in which a floor covering is to be removed and/or installed. The apparatus comprises multiple gear means which are capable of providing mechanical leverage while raising and/or lowering connecting means which attach the apparatus to the object to be lifted.

Abstract: A process for making ready-to-tuft, mock space-dyed bulked continuous filament yarn is a one-step process. It joins extruding, texturing, and interlacing to yield a yarn that may be tufted directly into carpet without further texturing or twisting. In another aspect, one or more additional strands may be inserted in the process. An apparatus for making the ready-to-tuft, mock space-dyed, bulked continuous filament yarn is described.

Abstract: A lifting device for the controlled vertical movement of objects, especially such objects, to which is conveyed an electric current through a line, such as chandeliers, is described. It is especially characterized by the combination of a relatively longitudinal support, provided with a longitudinal guide. A threaded, preferably trapezoidally-threaded driving shaft journaled in the ends of support which shaft is driven by a motor via worm gear unit. A carriage guided by the longitudinal guide which carriage is movable in the longitudinal direction of support with a nut fastened to carriage, cooperating with the driving shaft. A shaft provided perpendicularly in support carrying a first ring gear and chain relatively heavy and stable to turning, running over first ring gear, chain being driven by carriage to change its position in relationship to support as the position of carriage is changed in relationship to support by driving shaft, chain carrying in a first end the object.

Abstract: A linear actuator comprising a hollow first cylindrical shaft with helical threads on its exterior surface and helical threads of opposite pitch on its interior surface and a second cylindrical shaft having an exterior surface with helical threads of the same pitch as on the interior surface of the first shaft and a motor for rotating the first shaft and relative to the second shaft end a base member. The second cylindrical shaft is coaxial with and adjacent the first shaft surface and its threads engage the threads of the first interior surface. Helical threads on the base member of the same pitch as the first shaft exterior surface threads are coaxial with and adjacent the first shaft exterior surface and engage the helical threads of the exterior surface of the first cylindrical shaft.

Abstract: The jack apparatus includes a jack having a tubular housing that is elevated by jack screw mechanism. Arm members are mounted to the tubular housing to extend transversely outwardly in opposite directions for mounting a chain to permit adjustably varying the length of chain end portions extending away from the arm members that are to be attached to the object to be elevated. A tire is mounted to the tubular housing for abutting against the object that is to be elevated, the tire extending vertically above and below the arm members, and transversely further outwardly of the tubular housing than the tire. The tire has a vertical annular surface for abutting against the object.

Abstract: A screw jack (20) includes a stand (21) which houses a side gear (58) which, when rotated, turns a bottom gear assembly (67). An inner screw (73) is connected to the bottom gear assembly (67) and thus turns therewith. Because of an interaction with an outer screw (77), rotation of the inner screw (73) initially causes a tube assembly (24) to move axially relative to a hexagonally shaped sleeve (23). A hex nut (81) is attached to the lower end of the tube assembly (24) to prevent rotation of the tube assembly (24). The nut (81) threadably engages the outer screw (77) and at one stage during the use of the jack (20), the nut (81) also engages a shoulder (82) of the sleeve (23) so that upon continued rotation of the screw (73), the tube assembly (24) and sleeve (23) move axially together. A load bearing assembly (25) is carried at the top of the tube assembly (24) and is adapted to be positioned under the frame or other component of a vehicle to be lifted.

Abstract: The scaffolding comprises a post having a plurality of vertically aligned and equally spaced studs protruding on one of its surfaces. A frame supporting a work platform can move along the post, a sleeve being attached to the frame for guiding it along the post. The sleeve, the frame and the work platform partially surround the post. A lifting apparatus, installed on the sleeve, comprises a rotatable endless screw which is parallel to the post and which has a peripheral and helical flange which bears on the studs. An engine, an electric power drill or a manual handle will rotate the endless screw via one or two speed reducers. The rotation movement of the endless screw will result in the axial displacement thereof along the post, carrying the frame and work platform along with it. Another embodiment of the invention comprises a work platform which is supported at both of its ends by a lifting apparatus movable along a post.

Abstract: A device for lifting and holding a cabinet to be mounted to a wall or ceiling. A base member is mounted on a suitable support, and a hollow, linear, elongate drive shaft extends upwardly from the base member. An elongate lift shaft is received coaxially within the drive shaft, with the lift shaft being driven in a longitudinal movement up and down within the drive shaft. At least two elongate, hollow stabilizer shafts are spaced outwardly from the drive shaft, with a longitudinal axis of each stabilizer shaft being substantially parallel with a longitudinal axis of the drive shaft. An elongate idler shaft is received coaxially within each stabilizer shaft, with each idler shaft being movable longitudinally within its respective stabilizer shaft so that the upper end of the idler shaft can move up and down relative to the upper end of the respective stabilizer shaft.

Abstract: A jack of the type having inner and outer legs and a screw for extending and retracting the inner leg relative to the outer leg. The screw is mounted on a base fixed to the outer leg for rotating and limited endwise movement between the upper and lower positions relative to the base such that the screw and inner leg can move downwardly to the lower position when the inner leg is out of ground engagement and the inner leg moves the screw toward the upper position when the leg engages the ground. A rotary drive member is mounted for rotation relative to the base about the axis of the screw and a transmission mechanism responsive to rotation of the drive member drives the screw at a high speed ratio when the screw is in the lower position and at a low speed ratio when the screw is in the upper position.

Abstract: A screw jack includes a pair of frames disposed between a pair of walls, a bracket disposed above the beams, and a bolt engaged between the lower ends of the frames. An actuating device is engaged with the bolt and includes a motor for rotating the bolt so as to move the lower ends of the frames toward each other or away from each other and so as to elevate the bracket. The bracket can be easily move up and down by the motorized actuating device.

Abstract: Disclosed is an improved apparatus and method of moving a large, heavy structure or piece of machinery, such as an oil rig structure on an offshore platform. A plurality of load bearing plates are provided for supporting the structure. Each of the load bearing plates rides upon a plurality of rollers connected together by an endless chain revolving about a central core member when the structure is to be moved. A motor drives the endless chain connecting the rollers on which at least one of the load bearing plates rides when the structure is to be moved. A worm gear coupled to the motor transmits the motion of the motor to the endless chain to translate the structure across a platform.

Abstract: A two-speed linear actuator with high thrust and a high speed of translation for a machine, particularly a bending press. A linear actuator for a machine, particularly a bending press, having first and second bodies (2, 4) mounted for sliding relative to each other and a male-and-female screw mechanism (14) for controlling a relative sliding movement of the two bodies along a working line. The male screw (16) and the female screw (27) are supported for rotation by the first and second bodies (2, 4) and can be rotated by respective electric motors (24, 38). The motors (24, 38) are associated with respective speed-reduction devices (22, 26 and respectively 36) having substantially different reduction ratios. The actuator further includes a braking device (42, 44) associated with the member of the male-and-female screw mechanism (14) which is connected to the speed reduction device (22, 26) with the lower reduction ratio.

Abstract: An actuator suitable for use as an ejection jack for deploying an aircraft mounted ram air turbine is provided. The actuator utilizes a spring powered ballscrew operatively coupled to a centrifugally actuated brake in such a manner that the brake limits the speed of reciprocating movement of the ballscrew. The problems of fluid leakage and slow deployment at cold temperatures, often encountered in prior ejection jacks utilizing hydraulic dashpots for speed control, are thus eliminated. The actuator also includes a locking device for locking the actuator in either an extended or a retracted position. Features are also provided for attaching an external drive mechanism in a manner allowing the ballscrew to be utilized for resetting the actuator to an initial non-extended position.

Abstract: Wrench for continuous driving engagement with a rotatively driven element such as a screw, bolt or nut, which is particularly suitable for use where the ends of the driven element are not accessible and in applications where space for manipulation of the tool is limited such as in spinal fusion surgery. The wrench has a peripheral driving element which can be engaged from the side with the driven element, and in some embodiments an articulating handle which enables the wrench to rotate the driven element through a substantial angle with only a few degrees of handle movement.

Abstract: A drive mechanism for a hospital bed effects relative vertical movement of a base and a patient litter. The drive mechanism includes spaced, telescoping threaded screw assemblies, which are driven by a single electric motor through a train of gears having helical teeth oriented to offset inherent frictional forces of the screw assemblies. A support for the motor and a component of the drive train are made of electrically nonconductive materials to electrically isolate the motor, and are arranged to damp vibrations produced by the motor. Two coiled electrical cords extend between the base and patient litter, and are each received in a recess in the patient litter when the patient litter is adjacent the base. A sensor arrangement provides an electrical signal indicative of the relative vertical positions of the patient litter and base, and a manual drive arrangement is provided to permit the gear train to be manually driven.

Abstract: A jack is provided which includes a vertical lift rod which is disposed within a tubular housing and has a male thread formed on its longitudinal body. Two guide blocks are included with each having a recess with a half female thread formed therein, the two blocks together forming a complete female thread to engage or disengage from the male thread of the lift rod. The lift rod can be lifted up by its rotation within the female thread, when the lift rod is rotated by a handle connected with a worm engaging a worm gear. The worm gear has two keys formed on its inner wall for receipt within two respective longitudinal slots of the lift rod for engagement thereof. The lift rod can be rapidly lowered by displacement of the two guide blocks away from engagement with the lift rod. A rack and pinion arrangement is provided for displacement of the guide blocks responsive to rotation of a handle coupled to the pinion.

Abstract: A screw-type jack including an auxiliary screw barrel which is engaged with a ram cap at the uppermost stage. With that construction, this screw-type jack also has such function as to overlay an upper portion of a casing by the auxiliary screw barrel when the jack is contracted, in addition to widening the lift of the jack, whereby the case can be free from dirt and protected from damage.

Abstract: An electrically operated screw-type jack comprising a support base, a housing, a jack body, a lifting ram being contained in the jack body, a servo motor being contained in the housing, reduction gears for transmitting the driving power of the servo motor to the lifting ram, a safety device for preveting the servo motor and the power transmitting mechanism including the reduction gears from an abrupt failure in overloading the jack, and a square head pin for hand operation of the jack when there is an overload on the jack. The reduction gears consist of first sun and planet gears, second sun and planet gears and a sun gear cylinder. The safety device consists of a clutch disk, a clutch spring and a sleeve. The present invention can provide an electrically operated screw-type jack which can promote the driving power of the servo motor, and prevent its power elements from an abrupt failure when there is an overload thereon.