Abstract: The rocking platform for the positioning of vehicles above ground level comprises a supporting structure for sustaining a pair of parallel longitudinal rails which define the vehicle loading surface. The supporting structure presents a cradle-shaped base having the form of a dihedron with the convexity directed towards the ground. The cradle-shaped base is formed by two bearing planes, one of which is parallel to the loading surface, while the other is inclined with respect thereto. The rails extend, with access extremities, for a substantial length above and beyond one extremity of the parallel bearing plane in the direction of the inclined bearing plane. The platform is rockable from a horizontal position, in which the supporting structure rests on the parallel bearing plane, to an inclined position in which the supporting structure rests on the inclined bearing plane.

Abstract: An apparatus for lifting logs from the ground to an elevated position in order to allow for cutting of the logs. The log lifter comprises a lever arm having one end thereof bent downwardly to form a leg, the leg having on the end thereof a detachable support tube which serves as a fulcrum about which the lever arm may pivot. The log lifting apparatus includes a first claw which is attached at the bend between the lever arm and the leg. The log lifting apparatus further includes a log gripping arm which is pivotably mounted with respect to the lever arm and which terminates in a second claw. To lift a log that is lying on the ground, the lever arm is held in the upright position and the log gripping arm is pivoted in the withdrawn position so as to be adjacent to the lever arm. The first claw is slipped under the log and the log gripping arm is then pivoted to provide for engagement of the log with the second claw. The lever arm is then pivoted, preferably by manual means, about the support tube.

Abstract: The invention comprises a jacking device including a base member adapted in part to be placed in contact with a supporting surface; a ramp member connected at one of its ends to the base member, the ramp member being provided at its upper surface with guide means, preferably in the form of a slot, integral with the upper surface and extending longitudinally thereof. At least one intermediate supporting member is provided to extend between the ramp member and the base member, supporting the ramp member at an acute angle relative to the base member. Positioned for constrained sliding engagement within the slot or guide means is a load contacting member, the movement of which longitudinally of the device, is limited by the slot parameters. Finally, the device is completed by a transverse member attached to the under-surface of the base member at a point approximately one-third of the length of the base member from its attachment point with the ramp member.

Abstract: A jack device for boat trailers and the like includes a bracket which is attached to the trailer frame or trailer bed. An extensible and retractable telescoping leg pivoted on the bracket and has a length greater than the radius of the trailer wheel. When the leg is swung downwardly from a transport position to a lowered position, and the trailer is then moved, the leg will be pivoted and extended to a vertical load supporting position to support the trailer so that the wheel is elevated above the ground surface. Conversely, when the leg is swung to the transport position, a spring telescopically retracts the leg in the lowered load supporting position. A foot member pivoted to the leg assures planar contact of the leg with the ground surface.

Abstract: A log lifter has a support assembly engageable with an article, such as a log, to be lifted for elevating the article from a support surface with the assistance of a manipulating handle attached to the support assembly. Pivotally mounted on the handle is a hook which cooperates with a spike and a point mounted in juxtaposition on the support assembly to retain a log or other article on the log lifter.

Abstract: A drive-on rockable leveling device for elevating a vehicle wheel has an arcuate drive-on surface which intersects an arcuate ground-engaging surface to form a blunt-pointed forward end. The drive-on surface preferably has a radius of curvature which is substantially equal to or slightly greater than that of the wheel to be elevated, thereby maximizing the surface area of engagement between the wheel and the leveling device. The ground-engaging surface has a radius of curvature which is substantially less than that of the drive-on surface to provide a rapid rocking action which will effectively reduce the angle of ramp inclination seen by a wheel supported atop the leveler. Spaced traction lugs are provided along the drive-on surface and along the ground-engaging surface. A wedge-shaped retaining block has an upper surface configured to mate with the ground-engaging surface of the leveler to positively retain the leveler in place once a wheel is supported atop the leveler.

Abstract: A jack is mounted on each longitudinal frame channel aft of the wheels of a trailer. A pivoted leg with a foot plate on one end is pivotally mounted on the frame for rotation in a fore and aft vertical plane. When not in use, the leg is held in horizontal attitude by a latch pin. In the event a trailer tire becomes flat and it is desired to elevate the wheel for replacement, the latch pin is retracted and the leg rotated to a rearward and downward position wherein the toe of the foot plate engages the ground. The trailer is then slowly backed a few inches, causing the leg to tilt into vertical attitude, at which juncture it is locked in place by the latch pin.Since the leg is longer than the radius of the wheel the wheel is elevated above ground level when the leg is vertical. Wheel replacement is thereby facilitated. The wheel is returned to ground level by reversing the foregoing steps.