US2669422A - Bumper jack - Google Patents

Description

C. E. BRANICK Feb. 16, 1954 BUMPER JACK Filed July l0, 1952 INVENToR. CHARLES l'. .Ema/cl( BYWWMVM! rroR/VEYS Patented Feb. 16, 1954 UNITED STATES iiTENT OFFICE BUMPER JACK;

Char1es.E..Branick, Fargo, N..Dak.

Application July 10, 1952SeriaIN'o. 298,019

(01;. Z54L-Z)S 1 Claim.

My invention relates to fluid pressure lifting jacks, and more particularly to bumper jacks for lifting automotive vehicles, and is in the nature of an improvement of the structure disclosed and broadly claimed in my co-pending application filed December 13, i951, S. N. 261,499, entitled Bumper Jack.

The primary object of my present invention is the provision of a bumper jack for automotive vehicles of the type above described which is provided with means for varying the lateral spac ing between the pair of bumper engaging lifting elements, herein referred to as lifting heads and identied as lifting arms in my above identified Referring to the drawings wherein like charactors indicate like parts throughout the several v1ews:

Fig. l is a view in side elevation of my novel structure;

Fig. 2 is a view in front elevati-on; and

Fig. 3 is a fragmentary detail in plan of the lifting beam and one of the lifting heads carried thereby.

Referring with greater particularity to the drawings, the numeral I indicates a mounting base having mounted thereon a pair of laterally spaced wheels 2, upstancling pressure cylinder 3, having a detachable head 5i at its upper end, and elongated external track surfaces 5 and s on the forward and rearward sides respectively of the cylinder 3. Mounted within the cylinder 3 for reciprocal movements is a piston, not shown, having a plunger rod I working through an opening in the head A cross head il having an inverted U-shaped handle e projecting upwardly therefrom is rigidly carried by the upper end of plunger rod 1.

A pair of lifting links Iii have their upper ends rigidly secured to the cross head by means of headed bolts iI, whereas the lower ends thereof 1' are connected by an axle I2 upon which are journalled a pair of rollers i3. Rollers I3 are adapted to ride one each on the track 5 when vertical movements are imparted to the piston, the plunger rod 'I and the cross head Also rigidly secured oneach to' the lowerv end portions of the lifting links Ill and projecting rearwardly therefrom, preferably at right angles thereto, are a pair of guide rods I4, each Of which carry opposed rollers I5, one each of which rides upon a rail 6.

All parts heretofore described, as well as the rearwardly projecting handle I6 the thrust roller Il, are identical to the parts described in my above identified cti-pending application, S. N. 261,499.

.A lifting beam, identified in its entirety by the numeral Iii, is shown as being rigidly secured, by welding or the like i9, to the forwardly projected edges 2t of the lower end portions of the lifting links I s in overlying relationship to the roller I3. Lifting beam I8 includes a tubular intermediate section 2I, preferably and as shown being generally rectangular in shape, and end sections 22 adjustably slidably mounted within the tubular intermediate section 2l. Also preferably and as shown, the adjustable end sections 22 are rectanguiar in cross section and are slidably received within the section 2| in side by side relationship, see Fig. 3. It is to be noted that the intermediate section 2I has considerable length so as to provide an adequate bearing surface for the adjustable sections 22. Lifting heads 23 on the extreme outer ends of beam sections 22, preferably and as shown are yoke-like in cross section, so as to nestingly receive the bumper of an automotive vehicle, not shown, or other horizontally disposed bar-like member thereof. It will be noted that lateral adjustability of the lifting heads 23 so as to engage the bumper, or other portion of the vehicle in the desired spot and at a proper width for stability during the lifting movements of the jack, Ina-y be readily accomplished without excess strain upon the end sections 22 and without materially reducing the bearing surfaces between said end sections 22 and the tubular intermediate section 2|.

While l have shown and described a commercial embodiment of my invention, it should be obvious that same is capable of modification without departure from the scope of the present invention as defined by the appended claim.

What I claim is:

In a portable nuid pressure jack, a mounting base, an elongated vertically disposed pressure cylinder on said base, guide means at the opposite sides of the longitudinal axis of said cylinder providing surfaces parallel to the longitudinal axis thereof, a fluid pressure operated plston within said cylinder, a. plunger rod carried by said piston and projecting upwardly through the upper end of said cylinder, a cross-head rigidly connected to the `outer projecting portion of said plunger rod and extending laterally outwardly therefrom in the vertical plane common to said guide means and longitudinal axis of the cylinder and terminating adjacent one end of said guide means, said rod and cross-head moving upwardly in said vertical plane upon actuation of said piston by said iuid pressure, a load lifting structure including lifting links connected to said cross-head and depending therefrom to points adjacent the opposite ends of said guides, an extensible and retractible load lifting beam connecting the lower ends of said links together, anti-friction means carried by said links and engaging said guides adjacent said load lifting beam, said load lifting beam extending forward of theeylinder and horizontally disposed in relation to said longitudinal axis thereof, said beam comprising a rigid intermediate section. projecting laterally outwardly beyond said guides, adjustable end sections of polygonal cross-section configuration slidably mounted for relative longitudinal movements on said rigid section, and lifting heads carried by the outer end portions of said end sections.

CHARLES E. BRANICK.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 854,381 Rawlinson May 21, 1907 1,214,378 Sadlock Jan. 30, 1917 1,964,119 Hendry June 26, 1934 2,490,233 Schildmeier Dec. 6, 1949 2,555,808 Murray June 5, 1951 2,558,535 Billings June 26, 1951 FOREIGN PATENTS Number Country Date 825,493 Germany Jan. 10, 1952

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