US1784116A - Hydraulc jack - Google Patents

Description

J. P. SHEVLIN HYDRAULI C JACK Dec. 9, 1930.

Filed March 12, 1928 2 Sheets-Sheet l J 535% Z? J/zerm AMQJ 77% Dec. 9, 1930. J. P. SHEVLIN HYDRAULIC JACK Filed larch ]C 1928 2 Sh eet s-Sheet 2 K2 o \M /A/ 4... I. 2w

IIIIIIIIII Ilu'l lllllll llll Patented Dec. 9,1930

JOSEPH P. SHEYLIN, OF CHICAGO, ILLINOIS,

ASSIGNOR, BY MESNE ASSIGNMENTS, T0

GEORGE FREDERICK A. MAYLE, OF LONDON, ENGLAND HYDRAULIC JACK Application filed March 12, 1928. Serial No. 260,949.

This invention relates to hydraulic or lifting jacks which may be used for various puroses but which are particularly intended to e used in connection with motor vehicles.

The objects of this invention are to provide an improved jack of the hydraulic or liquidpressure type; to provide a jack of this character having novel pumping apparatus; to

provide a simplified form of cylinder and piston lift with an adjustable post or extension member; to provide an improved handle; and. to provide a device of this character which will be simple in construction as well as durable and'eflicient in operation.

In the accompanying drawings illustrating this invention;

Figure 1 is a vertical sectional view taken on the line 11 of Figure 2;

Figure 2 is a horizontal sectional view taken on the line 22 of Figure 1;

Figure 3 is a sectional detail taken on the line 3=3 of Figure 2;

Figure 4 is a section taken on the line 44 of Figure 2;

Figure 5 is an enlarged sectional vlew taken on the line 55 of Figure 6;

Figure 6 is a side view of the handle with parts broken away to show the interior construction;

Fi ure 7 is a perspective view of a cap for the lifting tube and adjustable extension;

Figure 8 is a detail showing a side view of the cap with the extension supported therein; and

Figure 9 is a section taken on the llne 9-9 of Flgure 1.

In the particular form of the inventlon as shown in these drawings, a hollow frame or casing 10 is provided which carries the operating liquid, as shown at ll, and also sup ports the pumping and liftlng mechanism. This casing has a base 12 to provide a firm support on the floor or ground.

A pump cylinder is mounted in one end of the casing 10 and has a threaded extenslon 14 which engages with a correspondingly threaded hole in the base 12 of the casing. The lower end of the cylinder is closed by a bottom 15 which has an inlet opening 16 that is provided with a check valve preferably comprising a ball 17. The cylinder 13 is provided with a tubular lining 18 having one or more slots 19 which extend up for a. distance from the bottom thereof, as shown particularly in Figure 1. The lining 18 is positioned so that one of these slots comes over the ball 17, but the slot is sufliciently narrow so that the sleeve or lining will hold the ball in its valve chamber. The pump piston 20 is preferably made up of a number of washers or rings which fit somewhat loosely over the end of a piston rod 21. These rings or washers abut against a collar 22 on the rod and are held by means of a metal washer 23 and pin 24. The piston rings or washers 20 are preferably made of leather or other suitable material and the clearance between them and the rod permits the fiuid to enter between the same and press outwardly on the rings to in sure a tight closure against the cylinder or lining. The upper end of the rod 21 is provided with rack teeth 25 which are engaged by a pinion 26 which is secured to the end of a transverse shaft 27 which is mounted in a bearing 28 in the end of the casing 10. The bearing is preferably provided with a packing gland 29, as shown, to prevent the escape of liquid. The casing has a hole 30 in the top for the insertion of the pump, and this hole is provided with a hollow cap 31 into which the rack projects when it is in raised position.

The shaft '27 may be provided with any suitable form of handle for operating the pump, but in order to enable the operator to place the jack under an axle and operate the same from a distance, I have provided the novel handle shown. The end of the shaft 27 is made square, as shown at 32, for receiving a socket 33 which has a square hole in one end for engagement With the shaft. In order to hold the socket in engagement with the shaft, the latter is provided with a pin 34 which engages with a slot 35 in one slde of the socket. The socket has an annular groove '36 in which is placed a ring 37 which has two projecting ends, as shown in Figure 4, which are connected by a clip 38. When the ring 37 is turned so that the cli is opposite the slot 35, the socket will pass reely in over the pin 34 and after it has reached its engaging posisides.

tion, the ring 37 is turned, as shown in Figure 4, so that it will engage with the pin and prevent the socket from becoming disengaged from the shaft. The outer end of the socket has a hole or recess 39 for receiving the end of a pipe or tube 40 which fit somewhat loosely in the hole and is held by a bolt or rivet 41 which passes through somewhat enlarged holes in the pipe 40, as shown in Figure 1, to give a universal joint connection between the pipe and the socket. The outer. end of the pipe has acap 42 which is provided with a hexagonal hole to receive a telescoping hexagonal rod 43 which is bent at its outer end to provide a handle 44. The rod is prevented from becoming disengaged from the pipe by means of a pin 45.

The pump discharges through an outlet 46 in the bottom 16'which is provided with a check valve 47 having a stem 48 which pro jects upwardly into the cylinder. The valve 1s held in normally closed position by means of a spring 49 which is seated in a plug 50 in the bottom of the casing 10, this plug serving as a means for inserting the valve as well as for cleaning purposes if necessary. The pump discharges into a passageway or port 51 in the bottom 12 of the casing which leads tothe lifting or elevating cylinder 52 which is preferably of considerably larger diameter than the pump cylinder. The cylinder 52 instead of being formed integrally with the block or casing 10 comprises a tube which fits in an annular recess 53 in the bottom of the casing where it rests on a gasket or washer 54 in order to make a tight joint. The upper end of the cylinder passes through a hole 55 in the top of the casing and is pressed downwardly against the washer 54 by means of a threaded cap 56 which also serves as a packing gland to compress the packing 57.

The piston 58 is secured to the lower end of a tube or pipe 59 which passes upwardly through the-cap 56 and is provided with a lifting ring or collar 60 which fits over the upper end and is secured thereto in any suitable manner, as by a rivetor pin 61. This lifting ring or collar has a central hole or opening 62 whichis elongated, that is, it is of substantially circular form with flattened An extension bar or post 63 passes through the hole 62 and is provided at its top with a head or enlargement 64 for engagement with an axle or the like, as indicated at 65. This bar or post is prevented from disengagement with the tubular piston rod 59 by a pin 66. The bar 63 has a series of oppositely disposed lugs or projections 67 which are curved or pointed on their lower sides and which are spaced apart a suflicient distance to permit the cap or collar 60 to pass between adjacent pairs thereof; The rod 63 and these projections are formed so that the cross section corresponds to the shape of the hole 62, the arrangement being such that when the rod or bar is turned in one direction it may move freely up and down in the hole and then when turned the'lugs will project over the flattened sides to engage with grooves 68 in the top of the cap 60. This arrangement is such that the operator-may quickly raise the bar 63 to approximatel engaging position and then insert the jac under the axle so that the lifting action will commence approximately as soon as the piston.58 begins to rise.

When the device is arranged in position for lifting with the handle adjusted, as heretofore described, the operator swings the bandle portion 44 through a convenient arc, for instance from position w to position 3 as shown in Figure 3 which rocks the shaft 27 and causes the piston rod 21 to move up and down. Figure 1 shows the piston 20 as it is completing an upward stroke at which time the valve 47 is closed and the valve 17 is open with liquid being drawn in therethrough. When the piston moves downwardly, the liquid is forced through the valve 47 into the passageway 51 and from thence into the lifting cylinder 52, thereby causing the piston 58 to be raised.

When the jack is to be lowered, the operator swings the handle 44 farther around or to a position approximately such as shown at z in Figure 3 which causes the piston rod 21 to move down beyond the normal pumping range so that its lower end will engage with the valve stem 48 and open the valve 47. This permits the fiuid to pass back fromthe cylinder 52 through passageway 51 and valve 47 into the lower end of the cylinder 13 and from there it passes through the slots 19 up over the piston 20 into the cylinder 13 and from thence back into the main casing or chamber 10. Holes 69 are provided adjacent to the top of the cylinder 52 so that if the operator continues to pump after the piston 58 reaches the top of the cylinder 52,

some of the liquid may pass out through these holes and prevent undue pressure on the cylinder. This also will notify the operator that the lifting piston has reached its extreme position.

My improved-jack may, of course, be made in any size desired and it will also be noted that changes may be made in the details of construction or arrangement of the parts without departing from the scope of this invention; therefore I do not wish to be limited to the exact construction herein shown and described, except as specified in the following claims. in which I claim:

1. In a device of the character set forth, the combination with a casing having a lifting cylinder and piston, of a pump for supplying fluid thereto, said pump comprising a cylinder mounted in the casing and having a bottom therein, an inlet opening through the bottom, a ball check valve in said open ing, a sleeve mounted in the cylinder and having slots extending upwardly from the bottom thereof, an outlet valve in the bottom of the cylinder, a piston mounted in said sleeve, a piston rod having a rack thereon, a shaft mounted transversely of the rack and having a bearing in the casing, a pinion on said shaft engaging with said rack, and a handle for turning said shaft, the arrangement being such that when the handle is turned through a predetermined arc the pump will operate and when the handle is turned through a greater are the piston rod will engage with the outlet valve and permit fluid to pass back through the outlet valve under the piston and from thence through the slots and over the top of the piston.

2. A jack of the character set forth comprising a casing having a lifting cylinder and coacting lifting mechanism, a pump cylinder mounted in the casing, a passageway from the pump cylinder to the lifting cylinder, an outlet valve in said passageway, an inlet valve at the bottom of the cylinder which provides an inlet from the casing to the pump cylinder, a piston in said cylinder, a piston rod, a rack on said rod, a shaft arranged transversely of the rod, a bearing in the easing for said shaft, a pinion on the shaft which engages with the rack, a socket adapted to engage with an angular extension on the shaft, means for holding the socket in position, a tube having a universal joint connection with the socket, a rod having a telescoping connection with the tube, and a handle on the rod for rotating the same to actuate the pump.

3. In a hydraulic jack, the combination of a casing adapted to contain the fluid, a pump in said casing, means for actuating the pump, a cylinder comprising a tube having its lower end engaging with an annular recess in the bottom of the casing, a passageway from the pump to the cylinder, :1 cap engaging with the casing and adapted to press the cylinder downwardly, a piston in said cylinder, a tubular piston rod for said piston, a ring secured to the upper end of the piston rod and having an elongated opening therethrough with laterally arranged notches adjacent to the opening, a lifting bar having a plurality of oppositely arranged projections, said bar with the projections thereon being free to pass through the elongated opening when turned in one direction, and said projections being adapted to engage with said notches when the bar is turned in another direction.

4. In a device as per claim 3, a casing having an annular recess at the bottom thereof, a packing washer in said recess, a tube engaging with the recess and passing upwardly through a hole in the top of the easing, and a threaded cap engaging with the or engagement with the part to be 1 then turned so that the projections will rest in the recesses in the rlng.

6. A fluid operated jack comprising a closed casing adapted to contain the fluid. a lifting cylinder detachably mounted in the casing and projecting upwardly through the top of the casing, means comprising a threaded cap which engages with the top of the casing and with the cylinder for holding the cylinder in posit-ion and toi'iiake a tight closure, a lifting piston and pis'ton rod coacting with said cylinder, a pump mounted in sai casing, a passageway through the bottom of the casing from the pump to said cylinder, Y and adjustable operating means arranged exteriorly of the chamber for operating the pump and means coacting with said operating means for permitting the fluid to pass back from the cylinder into the casin JOSEPH P. SHEV IN.

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