An apparatus for lowering a hitch onto a truck bed and raising the hitch off of a truck bed is disclosed. The apparatus includes: an upper carriage, a lower carriage, and a kingpin. The upper carriage is suspended from multiple lines, which lines are configured to lower and raise the upper carriage. The lower carriage is attachable to the upper carriage at various positions relative to the upper carriage to allow the load on the lines to be balanced in one direction. The kingpin is attached to the lower carriage, and kingpin is configured to be captured by the hitch. Allowing the hitch to be lowered onto the truck bed and raised off of the truck bed as the upper carriage and the lower carriage are lowered and raised by the lines. Another embodiment of the apparatus includes lifting devices attached to the lines for raising and lowering the hitch.

An apparatus for use in rigging stages includes a portable bar sized to extend across standard widths of a tower or a cross beam with a portion extending beyond the side of the tower or beam. A lifting mechanism, such as a block-and-tackle, is attached to the portion to allow a rigger to raise or lower heavy objects. In a method of use, a rigger carries the lifting bar to a desired location on a tower or beam and secures at least one end of the portable bar to one or more cross bars. Then the rigger can raise or lower heavy objects by attaching a flexible line from the lifting mechanism to the object and manipulating the lifting mechanism to assist in moving the heavy object to a desired location.

The invention disclosed is a rotational hoisting device that is mounted into the top opening of a mast pole located on a cellular network tower. The hoisting device is connected to a third party block and tackle and hoist line that is connected to a piece of cellular network equipment such as an antenna or radio. The rotational hoisting device can rotate back and forth in the mast pole to achieve mounting of the cellular equipment on a particular position on the mast pole without ever having disconnect the cellular equipment from the hoist lie.

This invention discloses a hoisting sheave shaft, a hoisting sheave and a lubricating device thereof, where the hoisting sheave shaft is provided with a first oil injection channel extending axially; an oil inlet of the first oil injection channel is arranged on an end surface of the hoisting sheave shaft; the hoisting sheave shaft is also radially provided with at least one second oil injection channel; the second oil injection channel intersects with the first oil injection channel; and an oil outlet of the second oil injection channel is arranged on an outer circular surface of the hoisting sheave shaft.

An apparatus for lowering a hitch onto a truck bed and raising the hitch off of a truck bed is disclosed. The apparatus includes: an upper carriage, a lower carriage, and a kingpin. The upper carriage is suspended from multiple lines, which lines are configured to lower and raise the upper carriage. The lower carriage is attachable to the upper carriage at various positions relative to the upper carriage to allow the load on the lines to be balanced in one direction. The kingpin is attached to the lower carriage, and kingpin is configured to be captured by the hitch. Allowing the hitch to be lowered onto the truck bed and raised off of the truck bed as the upper carriage and the lower carriage are lowered and raised by the lines. Another embodiment of the apparatus includes lifting devices attached to the lines for raising and lowering the hitch.

The self-clamping descender with pulley includes a first flange with a side wall defining a rope channel, a pulley fitted in rotary manner with respect to the first flange around a first axis of rotation, the pulley only rotating in a first direction of rotation around the first axis of rotation. The first axis of rotation is fitted movable with respect to the side wall of the first flange so as to define a first position and a second position presenting different distances with respect to the side wall of the first flange. Clamping of the pulley in the second direction of rotation results in movement of the first axis of rotation and pulley in the direction of the side wall of the first flange up to a threshold position.

A hoist assembly includes: a rope; a first mount having a base and a pulley attached to the base; a second mount having a base and a pulley attached to the base; a first lift pulley movably associated with the first mount with the rope; a second lift pulley moveably associated with the second mount with the rope; a pair of support straps; a bracket located on each of the first lift pulley and second lift pulley for receiving one of the pair of support straps and one or more apertures formed through a side wall of the bracket; and a lateral strap secured at a first end through the one or more apertures of the bracket of the first lift pulley and at a second end through the one or more apertures of the bracket of the second lift pulley.

A lift device for a dust collection box of a wood working machine includes a driving shaft unit, a passive shaft unit, a rotary unit, a break unit, a pulley unit and a cable unit. The driving shaft unit and the passive shaft unit are connected to the underside of the working table. The driving shaft unit includes a first gear and a second gear. The passive shaft unit includes a third gear which is engaged with the second gear. The rotary unit is connected to the driving shaft unit to rotate the driving shaft. The break unit is pviotable between a break position and a loose position. When the break unit is at the break position, the break unit prevents the driving shaft from self-rotating. The lift device lifted or lowers the dust collection box by cooperation of the pulley unit and the cable unit the lift device.

The present invention generally relates to the field of games and game accessories. Specifically, the invention relates to a piata holding apparatus with an adjustable upright support and arm assembly capable of adjusting the configuration of the device, as desired by a user.

This invention discloses a hoisting sheave shaft, a hoisting sheave and a lubricating device thereof, where the hoisting sheave shaft is provided with a first oil injection channel extending axially; an oil inlet of the first oil injection channel is arranged on an end surface of the hoisting sheave shaft; the hoisting sheave shaft is also radially provided with at least one second oil injection channel; the second oil injection channel intersects with the first oil injection channel; and an oil outlet of the second oil injection channel is arranged on an outer circular surface of the hoisting sheave shaft.