Reversible Portable Hoist

(1) Technical Field

This invention relates to hoists or cranes capable of lifting heavy objects and moving the same. (2) Description of the Prior Art

Prior art devices of this type have relied on a variety of different structures for use on the ground and some mountable in trucks. See for example U.S. Pat. Nos. 3,521,860, 2,947,425 and 4,069,922.

In U.S. Pat. No. 2,947,425 a hydraulic hoist is disclosed that is mounted in a truck bed having a vertical stationary post with a movable sleeve thereon to which is secured a piston and cylinder assembly supporting a horizontally extending arm.

In U.S. Pat. No. 3,521,860, a knock down hoist is shown which is typical of a hoist design, having a U-shaped support frame and a removable vertical support member with a pivoted arm at its uppermost point. A hydraulic piston and cylinder is secured to the support member and the arm.

In U.S. Pat. No. 4,069,922 a portable crane with a hoist is disclosed which is mounted in a truck bed. This device requires an outrigger support foot to stabilize the crane and hoist. The base is secured to the truck with the uppermost portion rotatable therein.

Applicant's device can be mounted in a truck to the truck frame and utilizes a three-piece structure allowing a portion of the main vertical support member to be used as a horizontal tow arm extending outwardly of the truck when mounting therein.

A portable hoist comprising a support frame mounted to a truck frame. A vertical two-piece support assembly telescopically extensible and pivotally secured to one another from which extends a horizontal arm used to lift heavy movable objects. The upper portions of the vertical support member can be pivoted to outwardly extending position for lifting and towing vehicles.

FIG. 1 is a perspective view of the hoist mounted in a truck;

FIG. 2 is a side elevation with portions broken away; and

FIG. 3 is a sectional view of a portion of the hoist mounted to a truck illustrating attachment to the truck frame.

A portable hoist as best seen in FIGS. 1 and 2 of the drawings, comrises a U-shaped support frame 10 having spaced parallel tubular members 11 and 12 with a secondary tubular member 13 extending therebetween. The U-shaped support frame 10 has a plurality of spaced apertures through which fasteners 14 extend securing the support frame 10 to a truck bed 15 and frame 16 as best seen in FIG. 3 of the drawings.

A main vertical hoist support member 17 extends from the secondary tubular member 13 at the base of the U-shaped frame midway thereof.

The main vertical hoist support member 17 is tubular with its uppermost end having opposing spaced upstanding apertured tabs 19. A secondary vertical hoist support member 20 of a smaller outer diameter is telescopically and pivotally secured within said main vertical hoist support member 17 by a pin and clip assembly 21. A boom 22 has apertured end extensions 23 positioned on either side of the upper end of said secondary vertical hoist support member 20 and is pivotally secured thereto by a secondary pivot pin and clip assembly 24. A hook 24 is secured by a cable 26 to the free end of said boom 22 by a removable fastener 22A. Pairs of spaced apertured tabs 27, 28 and 29, the first two of which are positioned on opposite surfaces of said secondary hoist support 20 and on the main hoist support member 17 opposite the U-shaped support frame 10. An additional pair of spaced apertured tabs 30 are positioned midway on the underside of the boom 22. A hydraulic piston and cylinder assembly 31 is detachably secured between the tabs 28 and 30 supporting the boom 22 when in position as seen in FIG. 1 of the drawings. When used for lifting and towing other vehicles, the boom 22 along with the piston and cylinder assembly 31 is removed from the assembly as shown in FIG. 1 of the drawings, the secondary vertical hoist support member 20 is raised vertically and repositioned horizontally as seen in broken lines in FIG. 1 and in solid lines in FIGS. 2 and 3 of the drawings. The piston and cylinder assembly 31 is pivotally secured between the tabs 29 and 27 supporting the secondary vertical hoist support member 20, the hook 25 and cable 26 are moved from the boom 22 and attached to the other end of the secondary vertical hoist support member 20.

The portable hoist can alternately be removed from the truck bed 15 and caster wheels (not shown) inserted in the apertured support frame 10 and used in a common hoist configuration as seen in FIG. 1 of the drawings.

It will thus be seen that an improvement in a hoist has been illustrated and described that allows for the use of the hoists both in the truck and out of the truck with the added advantage of being able to tow a vehicle when mounted in a truck by the use of the two-part vertical hoist support members pivotally arranged to form a lifting and towing arm as would be required for vehicle towing.