US617135A

US617135A - John weeks

Info

Publication number: US617135A
Authority: US
Publication date: 1899-01-03
Anticipated expiration: 1916-01-03

Description

Patented Jan. 3, I899.

J. WEEKS.

HYDRAULIC JACK.

(Application filed June 10, 1898.)

(No Model.)

vwemtoz JOHN WEEKS, OF NE? YORK, N. Y., ASSIGNOR TO XVILLIAM M. DUDGEON, OF SAME PLACE, EXECUTOR OF RICHARD DUDGEON, DECEASED.

HYDRAULIC JACK.

SPECIFICATION forming part of Letters Patent No. 617,135, dated January 3, 1899'.

Application filed June 10, 1898.

To all whom it may concern.-

Be it known that I, JOHN \VEEKs, a citizen of the United States, and a resident of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Hydraulic Jacks, of which the following is a specification.

My invention relates to improvements in hydraulic jacks of the kind in which two pumps are employed of different capacities, so that the ram can be quickly pumped up against the load, and thereafter, or when desired for the purpose of exerting greater power, the larger pump will be thrown out and the smaller one only employed.

The invention more particularly described relates to improvements in the means whereby the large pump is thrown out and also the lowering of the ram effected.

Referring to the drawings hereof, Figure 1 is a vertical sectional View of the ram and its interior mechanism. Fig. 2 is a top View of the pump-block. Fig. 3 is a bottom View of the pump-block.

A is the usual casting for the jack. B is the ram-cylinder. C is the ram. D is the packing-ring on the ram, and E is the packing. F is the lever-socket; G, the knuckle; H, the knuckle-head. I is the pump-block, which is set in a suitably-shaped recess made in the bottom or under side of the casting A and is held in place by threaded nuts J and K, respectively. L is the plunger for the big pump; M, the plunger for the small pump. These pumps are provided, respectively,with the usual stemmed egress-valves N and 0, respectively, each provided with perforated bonnets, springs, dad, and the plungers are provided with suitable packing. All these parts may be of any usual or preferred form and do not require special description.

P is a circular block threaded at Q to the casting A of the jack, and in the center of this an opening is made, through which the spindle R passes. This spindle is provided with a hand-wheel S on the exterior of the jack.

T is a collar on the spindle, which is seated in a suitably-formed recess in the block I Serial No. 633,05 7. (No model.)

and is confined by a leather washer T and gland T. The washer is used to prevent leakage when the jack is used horizontally. The spindle consequently has rotary motion, but cannot move longitudinally. The lower end of the spindle R is threaded into ablock U, so that as the spindle is rotated by the hand-wheel S the threads on the spindle will cause the block U to move vertically up or down, depending upon the direction in which the spindle is turned, and in order to prevent the block U from turning a pin V,which is rigidly fastened to the plug \V,(which latter is threaded into a solid part of the pumpblock I,) enters and loosely fits a hole a made in the vertically-moving block U. The hole.

is made longer than the pin, so that the upper end of the pin will not strike against the up per end of the hole during the movement of the block.

b is the stem of a valve which is the relief or by-pass valve for the big pump. It has its seat in the lower end of the screw-plug W, and its upper end is fastened in the blockU. The valve is shown at c, and below the valve the stem proceeds downwardly, as at d. The stems Z) and d are made three-cornered or flattened in cross-section, so that the liquid may pass up by their sides, as usual in such construction.

Referring now to the pump-bores and the various water-passages, special reference being had to Figs. 1 and 2, e is the bore in the pump-block made for the larger pump. f is the bore for the smaller pump. g is the bore for the lowering and by=passing mechanism for the large pump, which has been already partly described. The spindle b is shown in Fig. 2 as resting in this bore. At the bottom of the big pump a water-passage 7b is made into the boring g, so that the liquid expelled by the big plungerpasses through this opening into the passage in which the lowering and bypassing devices above referred to are located, thence downwardly through a stemmed valve 2' into a passage j, and thence through a pas sage k, which likewise connects with the bottom of the small pump. Through these passages the liquid is conveyed from both of the pumps to the chamber beneath the ram.

The construction of the lowering and bypassing devices is such that when the reliefvalve 0 is on its seat in the plug W then the lower end of the stem (1 is separated by a space of one-quarter orone-half an inch, more or less, from the upper end of the stem of the valve 2', so that upon turning the hand-wheel S the block U, carrying the valve 0 and the stem (1 below it, may be depressed so far as to completely open the valve 0 without the stem (1 coming in contact with the upper end of the stem of the valve 2'; but when desired, the hand-wheel S being further rotated, the threads on the ends of the spindle R will depress the block U so far that the lower end of the stem d will come in contact with the upper end of the stem of the valve 2', so that this valve may be forced from its seat.

The operation of the apparatus is as follows: The jack being placed under its load, in order to pump the ram quickly up to the load, the hand-wheel S is rotated until the valve 0 is fully seated in the screw-plug W. Thereupon, the pumping-lever being operated as usual, both of the pumps receivingthe liquid from the reservoir, (which, of course, is the entire unoccupied portion of the jackcasing,) forces it into the chamber beneath the ram. The liquid from the large pump passes through the opening h downwardly beside the spindle of the valve 2', forces that valve off its seat, thence through the passage j into the passage 70, and from it into the chamber beneath the ram, and the liquid from the small pump passes in like manner downward through the egress -valve at its lower end and discharges into the same passage ts. As soon as the ram has in this manner been quickly elevated against its load,

when the weight becomes too great for the convenient operation of the combined pumps, (it is immaterial whether this occurs as soon as the ram has taken a bearing against the the load or later,) then in order to throw outthe big pump the hand-wheel S is turned in such manner as to depress the threaded block U. In its descent it carries the reliefvalve 0 with it, so that that valve is unseated; but it is not depressed so far as to unseat the egress-valve 7 of the big pump, merely suffi cient to open the relief-valve o. The pumping operation is now continued, and it will be observed that the small pump only is in operation, because the liquid which the big pump manipulates passes through the opening it and thence, since the relief-valve c is now open, it does not press the egress-valve v1 off its seat. On the contrary, the liquid rises by the sides of the stem (1 through the valve 0, thence upwardly through the threaded plug W by the sides of the spindle Z ,and discharges at the uppersurface of the threaded plug W back again into the reservoir, so that as the parts are now arranged the big pump does no effective work. It merely churns the liquid back and forth, taking it from the reservoir and discharging it into the reservoir. Meantime, however, the small pump is doing its regular work, forcing the liquid from the reservoir downwardly through its egress-valve t" into the passage 7.; and thence into the chamber beneath the ram, and the egressvalve 1' of. the big pump prevents backward flow of the liquid forced into the ram-chamber by the small pump, because as yet it has not been unseated. As soon as the load has been elevated to the desired height and suitably supported in order to get the jack out from under it it is necessary, as is well understood, to allow the liquid in the force chamber of the ram to escape therefrom. This is effected by still further turning the hand-wheel S, so that the block U is still further depressed, and the stem dis now brought in contact with the upper end of the stem of the egress-valve 2'. Then, sufficient power being applied to the hand-wheel S, that valve 1' will be forced off its seat, whereupon free return passage will be opened from the forcechamber of the ram through the passage is in the pump-block, through the cross-passagej, upwardly through the now opened egressvalve 1', and thence by the side of the stem of that valve and the stem d through the relief-valve c, which is likewise unseated at this time, and still upwardly by the sides of the stem 1), and out at the top of the threaded plug WV into the reservoir again.

It will be seen that by the peculiar construction and arrangement of the devices shown the means for throwing the big pump out and for effecting the lowering of the ram are durable, simple, easily operated, and of such a character as will not get out of order.

I claim I 1. The combination in a hydraulic jack of two pumps, each provided with an egressvalve and each connecting with the forcechamber of the ram; a supplemental passage connecting the bore of the large pump with the reservoir; a relief-valve in said passage; a threaded stem, actuated from the'exterior of the jack, adapted to unseat the relief valve and likewise, when given additional movement, adapted to unseat the egressvalve of the large pump, for the purposes set forth.

2. The combination in a hydraulic jack of two pumps, each provided with an egressvalve and both connecting with the forcechamber of the ram; a passage connecting the bore of the large pump with the reservoir, and likewise connecting with the passage from the pumps tothe force-chamber of the ram; a relief-valve in said passage; and a threaded stem, actuated from the exterior of the jack, adapted to unseat the relief-valve and likewise, when given additional movement, to unseat the egress-valve of the large pump; for the purposes set forth.

3. The combination in a hydraulic jack of two pumps, each provided with an egressvalve and both connecting with the force chamber of the ram; asupplemental passage connecting the bore of the large pump with the reservoir, and connecting also'with the passage leading to the force-chamber of the rain; two valves set in said first-named passage, one of them the relief-valve and the other the egressvalve for the large pump; and means, actuated from the exterior of the ram, adapted to unseat the relief-valve upon a certain degree of movement, and to hold it unseated and to unseat the egress-valve upon additional movement; for the purposes set forth.

4. The combination in a hydraulic jack of two pumps, one larger than the other; a supplemental passage which forms part of the connection between the larger pump and the force-chamber of the ram; two valves set in said passage, one the relief-valve for the large pump and the other its egress-valve; and means, substantially as described, whereby said relief-valve may be first unseated and then the egress-valve unseated; for the purposes set forth.

5. The combination in a hydraulic jack of a pump-block having three borings, two of them for pumps and one for a combined lowering device and means for throwing out one of the pumps; a water-passage connecting one of the pumps with said third boring; two valves set in said third boring, one a relief-valve for said pump and the other its egress-valve; and means located in said boring, actuated from the exterior of the jack, whereby the relief-valve maybe first unseated and then, being additionally moved, the egress-valve unseated, for the purposes set forth.

' 6. In a hydraulic jack having two pumps,