Abstract: A service pin assembly for a machine includes a service pin and a tray for retaining the service pin. The tray is attachable to a frame of the machine, and is pivotable relative to the frame between a first position and a second position. In the first position, the tray facilitates a storage of the service pin with the machine. In the second position, the tray facilitates an engagement of the service pin with a lift arm of the machine and the frame to restrict a relative movement between the frame and the lift arm.

Abstract: The invention relates to a lifting appliance or a jack for vehicles preferably comprising axles or four drive wheels. Said lifting appliance mainly comprises a base to which an arm is connected in an articulated manner, said arm containing a height-adjustable rod having an upper end which is positioned beneath a vehicle body or an axle, in order to change a wheel, for example. The invention enables the above-mentioned disadvantages to be mitigated, in that the inventive appliance eliminates certain steps carried out to lift the vehicle or to fold up the arm of the jack once the wheel has been changed, especially the use of a crank for cranking up the jack. Said novel appliance requires only one manual operation, that is mainly to manually position the appliance beneath the vehicle, in the usual spot for said function.

Abstract: A quick release trailer jack comprises a vertical support mast extending through a jack body. Pinion and worm gears housed in the body couple a crank to a rack gear on the mast for vertically raising and lowering the mast relative to the trailer. A plunger coaxial with the pinion gear permits an operator to axially translate the pinion gear lateral the mast axis, thereby decoupling the crank from the rack gear. The pinion gear slides into a cylindrical cavity containing a biasing spring which returns the pinion gear into its normal position, re-coupling the crank and the rack, when the operator releases the plunger.

Abstract: A quick-release rack and pinion safety jack assembly for mounting upon the tongue of a conventional trailer. The jack assembly comprises a vertical support stanchion extending upwardly from a rotatable caster, a rigid rack, and a weatherproof box-like gear housing penetrated by the stanchion. A rotatable hand crank is rotated to move the stanchion relative to the gear housing, to elevate or lower the trailer. The internal gear assembly comprises a worm gear driven by the hand crank and a drive gear driven by the worm which selectively meshes or unmeshes with the rack. The drive gear is mounted for rotation upon a rigid axle which penetrates elongated follower slots defined in opposite walls of the gear housing. The drive gear axle is coupled at its ends by rigid links rotatably anchored in a pivotal safety lever. The safety lever is manually deflectable along an arcuate path between a first lock position and a second released position.

Abstract: A tongue mounted rack and pinion jack for a trailer wherein a pair of die-cast gear box segments are bolted together for supporting a handle driven worm gear and a pinion gear in self-contained bearing surfaces formed in the gear box segments. When the gear box segments are secured together a gear box, a rack receiving passage and a leg receiving passage are formed therein. A common wall formed in the molded gear box segments separates the gear box from the rack receiving passage and has a window formed therein through which teeth on a pinion gear extend into the rack receiving passage and engage teeth on a rack extending longitudinally through the rack receiving passage and secured to a leg extending through the leg receiving passage.

Abstract: An improved trailer jack has a castor structure enabling use of a full size spare trailer wheel and tire on the jack; the jack has a gear box mechanism, a lift post drivable up and down by the gearbox, and a lift element pivotally journaled inside the post; the lift element has an offset structure which raises the spare axle axis up to a level above the bottom of the post and the axle is spaced to one side so that when the full size spare wheel and tire is used, it pulls up into a locked storage position above and alongside on the trailer tongue, when the spare is down, it swivels completely around under the tongue and around the lift post. The trailer is much easier to manually manipulate in a garage or driveway.An improved lift assembly with a unique swiveling lift member having both a trailing offset and transverse offset is utilized.

Abstract: A jacking apparatus having a quick release mechanism for disengaging the main shaft of the jack from the jacking gear to allow the main shaft to be selectively raised and lowered as desired without operating the jacking gear. The main shaft has a plurality of teeth disposed thereon in facing relationship with the jacking gear, which is preferably a worm gear mechanism. A stop bar is disposed between the shaft and the jack housing to hold the shaft in alignment with the worm gear mechanism when it is desired to operate the jacking gear. A spring-biased pin member extends through a diagonal slot disposed in the jack housing to engage the stop bar. When it is desired to disengage the shaft teeth from the jacking gear teeth, the user exerts upward pressure on the pin member to move the pin member and stop bar diagonally upward along the axis of the slot, thereby retracting the stop bar from the shaft and allowing the shaft to be rotated to disengage the shaft teeth from the jacking gear teeth.