US 2998960 A
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Description (OCR text may contain errors)
Sept. 5, 1961 J. H. SMITH PORTABLE HYDRAULIC JACK Filed May 9, 195B W.`.. u/ :K4
IN VEN TOR.
E MAM H. w m 7 A Ml United seres 'Pa-enf o John My invention relates to a new and useful improvement 1n a hoist adapted for hoisting various objects, and particularly adapted as a hoist for automobiles and trucks.
It is an object of the present invention to provide a hoist of this class which may be inserted under the body of the vehicle to be hoisted or which may engage with the bumper or similar object of the Vehicle.
Another object of the invention is the provision of a construction which will be rigid, durable, economical of manufacture and highly etiicient in use.
Other objects will appear hereinafter.
It is recognized that various modifications and changes may be made in the details of the structure illustrated without departing from the invention, and, it is intended that the present disclosure shall be considered to be but the preferred embodiment.
Forming a part of this application are drawings, in which,
FIG. 1 is a side elevational view of the invention;
FIG. 2 is a rear elevational view of the invention;
FIG. 3 is a top plan view of the invention with a part broken away;
FIG. 4 is a slightly enlarged sectional view taken on line 4 4 of FIG. 2.
As shown in the drawings, the invention comprises a base 7 provided with suitable castors or traction wheels 8. Mounted on the base 7 and projecting upwardly therefrom is a'hydraulic cylinder 9, projecting from the upper end of which is a piston rod 19. The cylinder is in communication with a hydraulic pump 11 in which is slidable a piston operable by the piston rod 12 which is connected at its upper end to the handle 13 which is pivotally connected to the cylinder 9 so that liquid may be pumped from the pump cylinder 11 to the hydraulic cylinder 9.
Secured at the lower ends and projecting upwardly from the base 7 are tubes 14. These tubes 14 project at their upper ends through a frame 15 to which the tubes are welded. Secured to each of the tubes 14 is an angle iron 16.
The piston rod extends through the frame and is secured at its upper end to a lifting plate 17. Secured to the under surface of this plate 17 and projecting downwardly therefrom are guide rods 1S, each of which slidably engages in one ofthe tubes 14.
Upon operating the handle 13 the piston rod 10 will move upwardly so as to move the lifting plate 17 upwardly. Thus, should the lifting plate be positioned under the object to be lifted, the object would move upwardly with the plate 17. The pump 11 may be adjusted in a well known manner so that the plate 17 may be raised or lowered.
Extending transversely of the frame, that is, at right angles to the plane at which the handle 13 lies, is a bar 19 having at its opposite ends a U-shaped clip 20 which may serve, when positioned below the bumper of an automobile, to move upwardly into engagement with the bumper bar. The bar 19 is connected at its opposite ends to a pair of spaced apart bars 21, each of which is connected at its rear end to a pair of spaced apart plates 22. A brace bar 23 is connected at one end to the upper end of the plates 22 and at its other end to the forward end of the bars 21. Rotatably mounted between these plates 22 is a pair of rollers 24 for riding upon the surface of the angle iron 16. A roller 25 is also rotatably atented Sept. 5, '1961 mounted between the bars 21, and this roller 25 bears Y against the face of one of the angle irons 16.
A strap 26 is connected at its upper end, at opposite sides of the structure, to the plate 17 and at its lower end to the bar 21. Extending between and connected to the aligned pairs of tubes 14 are connecting rods 27. When the plate 17 is moved upwardly and downwardly, the straps 26 will ride in frictional engagement with these rods 27. The side of the frame 15 is cut away as at 28 to accommodate the straps 26 in their upward and downward movement.
The construction is, therefore,'such that as the plate 17 is moved upwardly and downwardly, the lifting bar 19 will move upwardly and downwardly. ln this movement, through engagement of the rollers 24 and 25 with the faces of the angle irons which are in rigid connection with the tubes 14, a smooth and steady travel becomes possible. Thus the structure lis rigidly and solidly connected while, at the same time, upward and downward movement may be easily effected.
What I claim is:
l. A hoist of the class described, comprising: a substantially square shaped base; a vertical tubular standard xedly mounted on each corner of said base and extend ing upwardly therefrom; a frame iXedly connecting the upper ends of said standards; a horizontally disposed lifting plate positioned above said standards; a plurality of rods .secured to and projecting downwardly from said liftingplate; each of said rods being slideably mounted in one of said tubular standards; a hydraulic cylinder centrally disposed on said base; a piston rod operatively mounted in said hydraulic cylinder and being directly xedly connected to said lifting plate for raising and lowering said plate; a hydraulic pump operatively connected to said hydraulic cylinder; an engagement bar for engaging and lifting an object; means connecting said engaging bar to said lifting plate for movement upwardly and downwardly in unison therewith; and, roller members carried by said engaging bar and rollably engaging said standards for facilitating upward and downward movement of said engaging bar.
2. A hoist of the class described, comprising: a substantially square shaped base; a vertical tubular standard fixedly mounted on each corner of said base and extending upwardly therefrom; a frame xedly connecting the upper ends of said standards; a horizontally disposed Vlifting plate positioned above said standards; a plurality of rods secured to and projecting downwardly from said lifting plate; each of said rods being slideably mounted in one of said tubular standards; a hydraulic cylinder centrally disposed on said base; a piston rod operatively mounted in said hydraulic cylinder and being directly iixedly connected to said lifting plate for raising and lowering said plate; a hydraulic pump operatively connected to said hydraulic cylinder; an engagement bar for engaging and lifting an object; means connecting said engaging bar to said lifting plate for movement upwardly and downwardly in unison therewith; roller members for facilitating upward and downward movement of said engaging bar; angle irons fixedly mounted on said tubular standards; and, said roller members being carried by said engaging bar and rollably engaging said angle irons.
References Cited in the le of this patent UNITED STATES PATENTS 507,807 Green Oct. 3l, 1893 1,981,680 Tindale Nov. 20, 1934 2,740,607 Branick Apr. 3, 1956 2,904,308 Vergara Sept. 15, 1959 2,909,358 Southerwick Oct. 20, 1959