US2258825A

US2258825A - Pneumatic jack

Info

Publication number: US2258825A
Application number: US359613A
Authority: US
Inventors: Thompson Herbert Bert
Original assignee: ARCHIE H WARD; SAMUEL J REDD
Current assignee: ARCHIE H WARD; SAMUEL J REDD
Priority date: 1940-10-03
Filing date: 1940-10-03
Publication date: 1941-10-14
Anticipated expiration: 1958-10-14

Description

Oct. 14, 11941. H. B. THOMPSON PNEUMATIC JACK Filed Oct. 3, 1940 A iforney Patented Oct. 14, 194i PNEUMATIC JACK,

' Herbert Bert Thompson, Pittsburgh Pa, assignor of twenty-five per cent to Archie H Ward and twenty-five per cent to Samuel J. Bedd, both of Pittsburgh, Pa.

Application October a, 1940,.Serial No. 359,613

' 2 Claims. (c1. 121+) The present inventionrelates to new and useful improvements in pneumatic jacks particularly for automobiles and. has for its primary object to provide, in a manner-as hereinafter set forth,

a device of this character which is adapted to be I expeditiously connected for actuation to one of the cylinders of the engine of the vehicle when it is desired to raise said vehicle.

Another very important object of the invention is to provide a jack of the aforementioned character comprising unique means for positively securing the device in raised or elevated position, thereby greatly promoting safety.

Other objects of the invention are to provide a jack of the character described which will be comparatively simple in construction, strong, durable, highly efficient and reliable in use, compact, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in side elevation of a jack constructed in accordance with the present invention, showing the device raised.

Figure 2 is a view principally in vertical section through the device with parts omitted.

Figure 3 is a top plan view with parts broken away.

Figure 4 is a cross sectional view, taken substantially on the line 44 of Figure 1.

Figure 5 is a detail view in cross section, taken substantially on the line 55 of Figure 4.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a foot or base I of any suitable metal. Mounted on the base I is a cylinder 2. The cylinder 2 includes a flanged upper end or head 3 having recesses or notches 4 therein.

Extending slidably through the upper end 3 of the cylinder 2 is a rod 5. On the lower end of the rod 5 is a piston 6 which is adapted for reciprocation in the cylinder 2. On the upper end of the rod 5 is a seat I which is engageable beneath the vehicle or other object to be raised.

Beneath the seat 'I is a lip or flange 22 the purmunicates with the cylinder 2 at the lower end thereof. as at 9, for raising the piston 6. The air line or pipe 8 comprises a horizontally extending portion Ill having connected thereto a control valve I I. From the control valve II the airline is in the form of a hose which is adapted to belc'onnected in any suitable-manner to one of the cylinders of the vehicle engine for receiv-- ing gases therefrom.

Also rising from the foot or base I is a bracket I2 having pivotally mounted thereon for swinging movement in a vertical plane a safety catch l3. The safety catch I3 is in the form of a metallic bar having on its free end a slotted head I 4 which is engageable with the lip 22 in the manner suggested in dotted lines in Figure 1 of the drawing for positively securing the jack in elevated or raised position.

The rod I5 has one end pivotally connected to the catch I3 for raising and lowering said catch. The rod I5 is bent around the cylinder 2 and has formed at an intermediate point a loop I6 which is slidable longitudinally on the horizontal portion ID of the pipe line 8. At its other end, the rod I5 terminates in a suitable operating handle H which is located adjacent the control valve II. v I

Mounted on diametrically opposite sides of the cylinder 2 are vertical ratchet bars I8. Fixed beneath the seat I and depending therefrom are legs I9 which are'slidably engaged in the notches or recesses 4 in the flanged cylinder head 3. Mounted on the lower end portions of the legs I9 are pawls 2B which are engageable with the teeth of the ratchet bars I8 for positively supporting the seat I in substantially any desired adjusted position. Rods 2| are connected to the pawls 28 for disengaging said pawls from the ratchet bars I8 when it is desired to lower the jack.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. Briefly, the jack is positioned beneath the vehicle or other object and the line 8 is connected to one of the cylinders of the engine of said vehicle. With the engine running, the valve II is opened with the result that gases from the engine are forced into the cylinder 2 and the piston 6, the rod 5 and the seat 'I are elevated. When the desired elevation has been reached the valve II is closed and the jack is thus retained in the desired position. However, the pawls 2D ride over the teeth of the ratchet bars l8 and engage therewith for positively securing the jack in raised position. When the mitting the piston 6 to be forced downwardly in the cylinder 2 in an obvious manner. The re- What is claimed is:

1. A jack comprising a base, a vertical cylinder mounted on said base, a rod extending slidably into the cylinder through the top thereof, a piston on the lower end of said rod operable in the cylinder, 8. seat on the upper end of the rod, an air line communicating with the cylinder for introducing air under pressure thereinto for elevating the piston, a control valve for said air line, a safety catch pivotally mounted on the base and engageable with the seat for positively sesilient rod [5 is under tension at all times dueto the fact that it is bent around the cylinder 2 and slidably connected to the horizontal portion ID of the pipe line 8. In thislmanner the catch It will be frictionally secured in any desired position and will be retained against idle swinging movement when not in use. 'This construction and arrangement also keeps the handle ll-ad jacent the valve H at all times for convenient operation.

It is believed that the many advantages of a jack constructed in accordance with the present invention will be readily understood and although a preferred. embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

curing said seat in elevated position, an operating rod having one end pivotally connected to said safety catch, said operating rod including a loop at'an intermediate point slidable on the air line, and a handle on the other end of the operating rod adjacent the valve.

2. A pneumatic jack comprising a base, a cylinder,for the reception of air under pressure, rising'from said base, a rod extending slidably into the upper endof the cylinder, a piston on the lower end of said'rod operable in the cylinder, a seat on the upper end of the rod, a lip below said seat, a'safety catch pivotally mounted for swinging movement in a vertical plane on the base and engageable with said lip for securing the seat in elevated position, and means for actuating said safety catch.

HERBERT BERT THOMPSON.