US2546203A - Automatic or manually actuated hydraulic jack - Google Patents

Description

March 27, 1951 w, TUCKER 2,546,203

AUTOMATIC OR MANUALLY ACTUATED HYDRAULIC JACK Filed Nov. 50, 1946 3 Sheets-Sheet l W0 oazo w 6. Tu: KR

INVENTOR.

March 27, 1951 W. G. TUCKER AUTOMATIC OR MANUALLY ACTUATED HYDRAULIC JACK 5 Sheets-$heet 2 Filed N0. 120, 1946 We 01 R a: W (52 Tu: $151K March 27, 1951 w, 5, TUCKER 2,546,203

AUTOMATIC 0R MANUALLY ACTUATED HYDRAULIC JACK Filed Nov. 5Q, 1946 '3 Sheets-Sheet 5 Waoaeow Gave/ 52.

5% 5, INVENTOR.

bolts indicated at 2. bracket I by means of a pin or bolt 3 is a con- Patented Mar. 27, 1951 UNITED STATES PATENT OFFICE AUTOMATIC R MANUALLY AQTUA'EED HYDRAULIC JACK Woodrow G. Tucker, Stanfield, Oreg. App c t November :9 6; S ria 13549;

2, Claims. 1

This invention rel-ates to improvements in pressure actuated lifting jacks of the hydraulic type.

One of the principal objects of the invention is; the provision of a jack ofthis character which 15 readily adaptable, to theaxles of a vehicle and whichmaybe used individually or in multiple to elevate one: ormore of the wheels of thevehicle from the ground by a simple valve mechanism located on the interior of the vehicle. within con.- venient reach of the operator. I

Another object is the provision of a, device of this kind which is ofcompact, durable construce tion and which when collapsed into an inoperative position offers no air resistance or drag to the vehicle when in motion.

These and other objects will appear as my invention is more fully hereinafter described in the following specification, illustrated in the accompanying drawings and finally pointed out in the appended claims.

In the drawings:

Figure 1 is a front elevation of a jack made in accordance with my invention and with parts broken away and in section for convenience of illustration.

Figure 2 is a top plan view of Figure 1 with fragments also broken away.

Figure 3 is a view similar to Figure 1 showing the jack in an operative or lifting position.

Figure 4 is a front elevation of the device in movement between an inoperative and operative position.

Figure 5 is a diagrammatic layout of the source of pressure, pipe lines and control valve for directing pressure to points of ap lication.

.Referring now more particularly to the drawings.

In Figures 1 to 4, reference numeral I indicates a sup orting bracket secured to the front and to the rear axles of a vehicle near their opposite ends by any suitable means, such as c amps or U swingably mounted to the necting rod 4, to one end of which is secured a piston 5 which operates within a positioning cylinder 6. The head of the cylinder is formed into a hollow shaft I for rotatable attachment to the head 8 of a lifting cylinder 9 which is also swingably mounted to the bracket I by means of a hinge pin or bolt I9, extending outwardly therefrom. From the foregoing it will be seen that movement of the positioning cylinder 6 to the right, as viewed in Figures 2 and 3 will force the lifting cylinder 9 to move downwardly into a ver- 2 tical position as shown in Figure 3. Slidably mounted within the. cylinder 9 is a lifting jack consisting of a piston I;l having a connecting rod I2 terminating in a spherical end I3 to, which is attached for universal movement, a foot plate; [4.

The shaft I is bored as at I5 and isv in open communication at one of its ends, by means of a duct I6, with the interior of the cylinder 6 as shown, Fluid under pressure is directed to the interior of the hollow shaft 1 by means of a tube or pipe I! connected with a fluid pressure, pump to be hereinafter more fully described. Between the ends of the bore in the shaft 1 I form a port 8 and in spaced relation tov the port I form a slot or vein I9. The head 8, of the cylinder 9v is formed with ntake ct 2' a a te f pen om munication through a check valve 2| with the port I8 the hollow shaft when the cylinder 9 has been swung downwardly through degrees by means of the cylinder 6. An exhaust port 22 s a so form d n the ylind head 8 and s. i communication with the vein I9 through a, check val 3:-

When fluid pressure from the tube II' enters the bore I5 in the shaft I it is directed through the duct, I6 against the piston 5 which, of course, forces the cylinder 6 to move outwardly or toy the right as aforesaid. This movement forces the cylinder 9 to move downwardly into the position shown in Figure 3, whereat the duct 20 comes into communication with the port I8, whereupon the fluid pressure is then applied to the piston I I in the cylinder 9 to force the jack downwardly into contact with the ground or surface beneath the vehicle. This causes a resultant upward movement of the cylinder 9 which through the medium of the bolt III, bracket I, and axle, elevates the wheel from the ground. Meanwhile, of course, the exhaust port or duct 22 is held closed by the check valve 23 to prevent the pressure from backing up through the vein I9 into the hollow shaft I. Both cylinders 6 and 9 are at all times filled with fluid and as their respective pistons move toward their ends the fluid in advance of the piston flows through a duct 24 in the cylinder 9 into a return tube 25, and from the end of the cylinder 6 into a return tube 26. Both of said tubes terminate in open communication with any suitable form of T connection, or the like, as indicated at 21 (see Figure 5) for returning the fluid through a single tube 28 to the control valve, generally indicated at 29 in Figure 5, and which consists of a housing 39 and a core 3| rotatable therein by means of an actuating handle 32. The valve may be of any approved type for directing fluid pressure from any suitable pressure pump 33 through pressure pipe H to the interior of the hollow shaft 1, and by another setting for returning the fluid from the ducts 24 and 26, as aforesaid, from the cylinders 9 and 6, respectively, into a fluid supply tank 3% which by a return line 35 is connected with the intake side of the pump 33.

When the valve is moved into down position the weight of the vehicle causes the lifting cylinder to move downwardly with respect to the lift-,

ing jack. This of course forces the fluid previ ously applied to the piston II to exhaust through the duct 22 into the vein l9 throughout the entire upward swing of the cylinder 9 and into the hollow shaft 1, thence through the tube l1 and back into the supply tank 34. At this same time the flow of the fluid through the tubes 25 and 26 is reversed to replace the fluid back of the pistons in the cylinders 6 and 9.

The reverse flow of the fluid from the interior of both cylinders out through the tube H causes the cylinders to resume their retracted horizontal starting positions as illustrated in Figures 1 and 2.

The foot plate M is connected to the end of the connecting rod [2 for universal movement so that it will readily accommodate or adapt itself to any irregular ground surface or roadway it contacts for the lifting operation.

Although I have shown and described the invention as applied to vehicles it is to be understood that such use does not necessarily perscribe its limit of utility, since obviously the invention could be successfully applied to other operations requiring forces to be automatically and progressively applied in angular relation to each other. v While I have shown a particular form of embodiment of my invention, I am aware that many minor changes therein will readily suggest themselves to others skilled in the art without departing from the spirit and scope of the invention. Having thus described the invention. what I claim as new and desire to protect by Letters Patent is:

1. A lifting jack for vehicles comprising a positioning cylinder pivotally and slidably mounted with respect to an axle of the vehicle, a lifting cylinder mounted with respect to said axle for movement into vertical and horizontal positions by pivotal attachment at one of its ends to said positioning cylinder, a piston slidably mounted in the lifting cylinder, a shaft attached at one of its ends to the piston and its opposite end extending outwardly from the end of the lifting cylinder, valve means formed within the pivotal connection between said cylinders for progressively directing pressure into the positioning cylinder for moving said lifting cylinder from a horizontal to a vertical position and to the piston therein for forcing said shaft downwardly against a surface beneath the vehicle to force said lifting cylinder and said axle upwardly with respect to said surface.

2. A lifting jack for vehicle comprising a pair of cylinders pivotally attached to each other and to an axle of the vehicle, valve means formed within the pivotal connection between the cylinders and operable by swinging movement of the cylinders with respect to each other for directing pressure to one of said cylinders for moving it longitudinally with respect to the axle and through its pivotal connection with the other cylinder for moving the same into a vertical position with respect to the axle, and means movable within and extending outwardly from said last mentioned cylinder for contacting the surface beneath the vehicle to resist said pressure to cause a resultant upward movement of said cyl inder and the axle to which it is attached.

WOODROW G. TUCKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,613,268 Eisler Jan. 4, 1927 FOREIGN PATENTS Number Country Date 57,654 Norway June 7, 1937

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