Abstract: A lockable stabilizing apparatus for connection to the king pin of a recreational vehicle and including a lockable collar device securable to such king pin. A pair of divergent legs project from such collar to engage the ground in spaced apart relationship to brace such king pin and, consequently, the frame of the recreational vehicle from rocking relative to the axis of the support wheels. The collar may incorporate a slotted arrangement for loose receipt of the legs of a shackle to provide for wobble of the collar relative to the king pin.

Abstract: A jack stand apparatus comprising a broad stable base to ensure safe support of a raised object with a selectively positioned vertical support member secured by a ratchet and pawl type engagement mechanism. The jack stand in its free state maintains the pawl in engagement with the ratchet by means of a torque spring which applies sufficient force to ensure engagement of the pawl with the ratchet in any position. This spring biased type pawl ensures engagement of the pawl and ratchet to prevent sudden movement of the vertical support member during transport. A pivot pin handle which carries said pawl and torque spring may be manually rotated with sufficient force to oppose the torque spring thus permitting disengagement of the pawl from the ratchet.

Abstract: A trailer tongue twister apparatus having an elongated channel-like bedplate including a threaded drive screw disposed longitudinally in the bedplate and supported thereform at the opposite ends of the screw by a pair of journal supports, the method of construction including a hex head nut at one end of the drive screw for rotating the screw through a threaded hole formed within a cylindrically shaped block trunnion affixed to a load-bearing sled that travels along a pair of flanges when the drive screw is rotated, the sled carrying a cylindrical receiver ring fashioned for receiving a support leg of a travel trailer tongue jack, while rotation of the drive screw applied an alignment force to the tongue jack resulting in fine adjustments to the trailer coupler, which simplifies the alignment process and improves the coupler efficiency by permitting alignment between the trailer coupler and a staionary tow vehicle ball hitch in either a horizontal or angular pattern.

Abstract: A locking chock which is of the character of a ground brake for the fore and aft wheels of a tandem axle vehicle makes use of a separate chock or blocker for each wheel. Each chock has a flat, ground-engaging face and an oblique wheel-engaging face. There is an initially retacted threaded shaft extending between the chocks which, once the chocks are in proper position, is extended to push the chocks into blocking engagement against the corresponding opposite wheels.

Abstract: A low-slung carriage-mounted lifting jack has a long tubular handle for projecting the jack beneath a conventional automotive vehicle. The handle is tiltably mounted on the carriage and simultaneously serves as a pump handle for pumping hydraulic fluid from a reservoir to a ram which in turn is operatively attached to an elevating linkage for lifting the vehicle. A pump, for operation of which the handle is tiltably mounted on the carriage, delivers hydraulic fluid under pressure from the reservoir to the ram. To release hydraulic pressure in the ram, for lowering the linkage and returning the fluid to the reservoir, there is a release valve with a release pin projecting adjacent the end of the handle which is tiltably mounted on the carriage. Within the handle is a rotatably mounted rod extending throughout the length of the handle, and on the end of the rod is a cam in operating engagement with the release pin.

Abstract: An interlocking jack stand has right and left sides of complementary configuration, each supplying two legs of a four-legged stand. Each side is of a sheet material with a semi-circular corner portion merging with legs in right angular relationship and tapered in breadth so as to be wide at the bottom and narrow at the top. The material of one side has slots extending up from the bottom and material of the other side has slots extending down from the top. Slots are respectively at the junction of the semi-circular corner with the legs for one side and part way around the semi-circular corner of the other side so that when the sides are slid together in interlocked relation there is a circular hollow central column partially of double wall thickness in which a vertically adjustable screw support is mounted.

Abstract: A unitary multiple purpose oil block for use with and in cooperation in a lifting jack features a rigid block anchored between a pair of side plates comprising a frame adjacent one end. On various faces of the block holes are drilled for mounting the operating mechanisms, namely a hydraulic power cylinder, a pump, a lift-lower control valve and an overload release. Extensions of the holes are drilled to form passages of the hydraulic network with all passages in respective right angular relationship communicating with each other within a central partition between a pair of oil reservoir chambers. The operating mechanisms are separately mounted for purposes of economy of weight, simplicity, easy access and servicing.

Abstract: An interlocking jack stand has right and left sides of complementary configuration, each supplying two legs of a four-legged stand. Each side is a sheet bent at a right angle with legs tapered in breadth so as to be wide at the bottom and narrow at the top. Legs of one side have slots extending up from the bottom and legs of the other side have slots extending down from the top. The slots are spaced from the corner so that when the sides are slid together in interlocked relation there is a hollow central column in which a vertical adjustable screw support is mounted.

Abstract: A lifting jack with its elevating linkage has an elongated base supported on wheels and a hydraulic ram horizontally disposed in the base. A block which is a structural part of the base incorporates a hydraulic reservoir, a pump, valving, and a lift-lower control. A single handle serves both to actuate the pump and manipulate the lift-lower control. An overload release valve which can be factory-adjusted to limit the load which the jack can lift is interiorly mounted and combined with the lift-lower control to inhibit tampering which could inadvertently overload the jack.