US2517813A - Hoist - Google Patents

Description

Aug- 8, 1950 w. J. WALLACE, JR 2,517,813

HoIsT Filed Aug. 3, 1949 2 Sheets-Sheet 2 Patented Aug. 8, 1950 `UNITED STATES PATENT OFFICE HOIST Walter J. Wallace, Jr., St. Paul, Minn., assignor to ICardinal Corporation, St. Paul, Minn., a corporationof Minnesota i Application August 3, 1949, Serial No. 108,300

My invention relates to lifting hoists and, more particularly, to portable hydraulic hoists.

More specifically, my invention relates to relatively light-weight lifting hoists such as are frequently used. on loading platforms or the back ends of delivery trucks and the like. I-Ieretofore, it has been common practice to provide a truck with a permanent lifting hoist and to have a separate lifting hoist on the loading platform of `the warehouse from which the loading truck perates. The primary object of my invention is to provide a lifting hoist which may be readily lifted by the operator from one base to another. For instance, one such a base could be permanently installed in a truck and another on a shipping platform, and still another on a hand truck or the like for movements about a factory or warehouse. In accordance with my invention, one hoist could be operated from all three bases, thereby effecting a considerable saving. l

Another object of my invention is the provision of a hydraulic lifting hoist having the above characteristics, which is relatively light in weight so as to readily facilitate manual carriage thereof from one base of operation to another, but ywhich is also rugged in construction and durable in use.

A still further object of my invention is the provision of a device of the above type which has a minimum of working parts and which is relatively inexpensive to manufacture and easy to operate.

Referring tothe drawings, wherein like charr acters indicate like parts throughout the several views:

3 Claims. (Cl. 212-35) Fig. 1 is a view at side elevation of my novel device, some parts being broken away and other parts being shown in section;

Fig. 2 is a view, partly in end elevation and partly in section, taken on the line 2 2 `of Fig. l;

Fig. 3 is a view in section, taken on the line `3--3 of Fig. 1;

Fig. 4 is an enlarged section, taken on the line 4--4 of Fig; l; and

Fig. 5 is a view in perspective showing my novel hoist mounted, on a mobile frame or hand truck.

Referring with greater particularity to Figs. 1 4 inclusive of the drawings, I provide a tubular well-forming element I which has an open upper end and which terminates adjacent said open upper end in a radially-projecting bearing skirt 2 which is preferably formed integrally with the 2 i I member I. As shown, the well-forming member I is adapted to project downwardly through an opening '3 in the floor 4 of a truck or the` like, whereas the bearing skirt 2 is adapted to be rigidly secured to said floor 4 by means of a plurality of circumferentially-spaced nut-equipped anchoring bolts 5. The lower end of the wellforming element l is braced against lateral movements by any well-known means such as a beam Ii rigidly Vsecured to the underside of the floor II by anchoring bolts 'l which project through U-shaped angle irons 8. As shown, the element I is tightly received within an opening 9 in the central portion of said beam I5. Beam I5 may take any form but, as shown, is comprised of a pair of planks or the like 6a 4which are rigidly secured together by means of nut-equipped tie members I0. I

At this point, it should bepointed out that any given number of well-forming members I and cooperating bearing skirts 2 maybe installed in various floors Il, if desired, dependingupon where the objects tobe lifted are located. Adapted to cooperate with the well-forming elements I and cooperating bearing skirts 2, I provide alnovel hoist, identified in its entirety by the numeral II, and comprising a mast l2 made up of a pair of laterally-spaced members I3, a spindle I4, and a boom I5. As shown, spindle Il is adapted to be telescopically and rotatably received within the well-formingelement I and preferably is formed integrally with and projects downwardly from an enlarged base I6 in axial alignment with the mast I 2. As shown, base member I6 is in the natureof an enlarged plate adapted to overlie the skirt member 2 and is rigidly secured to the lower ends of mast-forming `members I 3 by welding or the like, as indicated at Il. As shown, particularly by Figs. 2 and 3, the skirt element 2 is provided with a plurality of circumferentially-spaced openings I8 `underlying the base IB. The base II is providedwit-h a locking bolt I9, which is 'receivable within an opening not shown in the'base I6 but which opening is registrable with the several openings I8 in the skirt 2 upon rotation of same. In this manner, the base I6 may be locked against rotation with respect to the skirt 2 in approximately any desired position. l

In spaced relation to the base member I6 and extending between the mast-forming members I3 is a tubular member 20 which is provided with outturned anchoring flanges 2l at its opposite ends. Nut-equipped bolts 22 extend through the members I3 and the flanges 2 I and rigidly secure said member `20 to the inner surfaces of the members iii, whereby to provide a closed fluid reservoir 23.

Boom l5, preferably and as shown, is likewise made up of a pair of laterally-spaced members ',ffi, which are pivotally secured to the upper ends of the mast-forming members i3 by means of a pivot pin 25 which projects therethrough. A tubular sleeve 226 maintains both the upper ends of the elements i3 and the inner ends of the members 24 in spaced relation.

Boom l is preferably longitudinally extensible and retractible and, to this end. I provide an inverted U-shaped member 2l which is provided with longitudinally-extended aligned slots 28 on each side which are adapted to slidably receive transverse supporting bolts 29 which. project through the members 2li. At its projected outer end, the member 2l' is provided with. a hook 30 preferably secured thereto by means of a chain or the like 3l.

A hydraulic cylinder 32 is pivotally secured. to the intermediate portion of the mast-forming members i3 by means of a pin 33. A piston, not shown, operates within the cylinder and is provided with a connecting rod 34 which projects outwardly therefrom and is pivotally secured, indicated at 35, intermediate the boom-forming members A. conventional hydraulic pump 35 is secured by suitable means to the outer sin ace of one of said mast-forming members latfra y outwardly from the tubular reservoir-forming member 2l! and is connected to the reservoir through said member lli by a passage not shown A flexible conduit 3l' connects the pump with the lower end of the hydraulic cylinder Pump 3'6', preferably and as shown. is provided with operating handle 38 for pumping fluid from the reservoir 23 into the lower end of the hydraulic cylinder 32 and with a valve, not shown but operated. by means of a handle 39, for permitting return of the fluid within the cylinder 'to the lreservoir 23.

From the above, it should be clear that a hydraulic hoist built in accordance with my novel combination and arrangement of parts is sufciently compact and light in weight to permit a single operator to lift the connected boom mast i2, spindle I4, and associated parts from one well I and be moved to another thereof at a different location. `It is important to note that, by virtue. of the novel combination and arrangement of parts above-described, the above advantage may be achieved without sacrifice of any of the weight-lifting ability of `the hoist. Fig. 5 illustrates further the adaptability of my novel hoist for use on a hand truck or the like. The `hoist of Fig. 5 is identical inl all respects to that of Figs. 1 4 inclusive and is identified by like characters. Thehand truck or mobile base frame of Fig. 5 comprises a pair of converging base frame members 40 reinforced at their inner ends by a gusset plate 4I. A supporting tube or well 42 extends upwardly from the gusset plate 4l and is provided at its other end with a circumferential flange 43. The supporting tube 42 is supported in its upright position by a pair of reinforcing ribs 44 welded thereto and to the gusset plate 4I. Mobility is imparted to the base frame by supporting wheels 45 journalled in the free end portions of the members 40 and a caster wheel 46 located below the supporting tube 42. With this arrangement, a load may be picked up from any location in a shop or warehouse and readily moved manually to a desired point of delivery.

My invention has been thoroughly tested and found to be highly'successful for the accomplishment of the above objects; and, while I have shown a commercial form of my device, in compliance with section 4888 of the United States Statutes, it should be clear that the same is capable of limited modification without departure from the spirit and scope of the appended claims.

lil/'hat I`claim is:

l. A lifting hoist comprising a tubular Wellforming element, said element terminating at its upper end in a radially-projecting bearing skirt, a supporting mast, a boom pivotally secured to the upper portion of said mast, said mast including a pair of laterally-spaced members, a hydraulic cylinder pvotally secured at its lower end to the intermediate portion of said mastforming members, a connecting rod-equipped piston in said cylinder, said connection rod being pivotally secured to the intermediate portion of said boom, said mast terminating at its lower end in a plate-like base, a liquid reservoir between said mast-forming members intermediate the lower end of said cylinder and said base, a. hydraulic pump secured to the outer surface of one of said mast-forming members laterally outwardly from said reservoir and connected to said reservoir through said mast-forming members, conduit means leading from said pump to said cylinder, and a spindle projecting radially downwardly from the intermediate portion of said base in axial alignment with said mast, said spindle adapted to make telescopic engagement with said well-forming element and .to be lifted therefrom.

2. The structure deiinod in claim l in which said' reservoir comprises an open-ended tubular member which is rigidly secured at its opposite ends one each to the inner surface of one of said mast-forming members, said mast-forming members providing the end Walls of said reservoir.

3. The structure donned in claim l in which said telescoping spindle. is mounted for rotation in said well-forming member, and in further combination with means on said base and skirt members for adjustably locking one thereof with respect to the other thereof.

WALTER il. WALLACE Ju.

No references cited.

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