US876920A - Hydraulic jack, punch, and similar machine. - Google Patents

Description

,No; 876,920. PATENTED JAN. 14, 1908.

J. WEEKS.

HYDRAULIG JACK, PUNCH, AND SIMILAR MACHINE.

' APPLICATION FILED NOV.24. 1906.

j wimeowo UNITED STATES PATENT OFFICE.

JOHN WEEKS, OF LOOUST VALLEY, NEW YORK, ASSIGNOR OF ONE-HALF TO HENRY C. DUDGEON, OF LOGUST VALLEY, NEW YORK.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed November 24,1906- Scrial No. 344,833.

To all whom it may concern:

Be it known that I, JOHN WEEKS, a citizen lic Jacks, Punches, and Similar Machines, of

which thefollowing is a specification, reference being had to the accompanying drawings, in which Figure 1 illustrates a vertical sectional view of the invention;. Fig. 2 illustrates a detail of the knuckle construction, whereby the pump piston is reciprocated; Fig, 3 illustrates a detail of one of the valve tripping devices.

In the drawin s hereof and in the following specification? will describe the invention as pertaining to a hydraulic jack of the upright type, because the invention, although applicable as above stated to a variety of uses, may be conveniently and well illustrated in such a machine.

In hydraulic jacks of large power it is inevitable that the movement of the arts is slow. Consequently when the acl is in position, it requires sometimes an annoying amount of pumping and consumption of time before the head of the ram can be brought up against its load and the lifting process commence, and under certain circumstances this delay is a matter of considerable consequence rather than mere annoyance. Several new forms of jacks have heretofore been invented in the attempt to overcome the above stated objections, but all of them, so far as I know, have been found inoperative or objectionable for one reason or another. In this present invention, therefore, I have modified the construction of the jack so as to avoid the objectionable features of earlier forms in this direction and my improved .apparatus is simple in construction, free from mechanical embarrassments, possessed of all the desirable attributes of such devices and of low cost.

Referring to the drawings, A, A, is the body of the jack, B is the ram, C the pump block screwed into the ram as shown, D the piston of the small pump provided with the usual valve, bonnet, etc., E the lower valve provided with bonnet and spring, as usual, F, the force chamber, G the piston rod, H the head of the jack, I the socket in the jack, J, J, the knuckle on the shaft of the socket K.

L, L, are two slideways formed in the head of the jack.

M is a cross-head which slides in the slideways L.

N is an enlarged pump bore at the upper end of the ram B, within which is the piston O of a pump of much larger diameter than the regular pump, the piston of which is indicated P is a waterway made through the metal of the ram.

Q is a check valve, R is a spring which normally seats the check valve.

S is a spindle supported in the metal of the head, as shown and provided with packing T I and gland U, as usual, and with an actuating lever or crank V, which is inclosed within a recessed casing W cast on the side of the head.

Y is a screw which engages in a recess Z out in spindle S to prevent its outward movement.

a is a check valve in the piston O, b is a spring which normally reseats the valve (1.

c is the usual perforated bonnet within which the spring I) is located.

The spindle S is cut away, as shown at d, in Fig. 3, so that the upper end Q of the valve stem of the valve Q may rest against it and the cut away part of the spindle S is given cam shape, as shown in Fig. 3, so that I when rotated a quarter turn, the valve stem Q will be depressed and the valve Q held off its seat. The valve stem Q is supported and guided near its upper end by the perforated 'top of the valve block, the seat for this valve pumps get ,t eir supply of liquid from the same primary source, 1. 6., the reservoir in the head of the jack, the smaller one D, however, gets its supply immediately from the continuation of the pump chamber of the larger pump, but the large one 0 receives its supply partly through the valve Q and water way P and partly through the sup lemental valve 0 located in the piston itse f. It is not always necessary to have these two water supplies, but I prefer to add the supplemental valve in the piston because unless there is free liquid supply, the big pump is apt to work hard on the intake stroke and if the valve Qand waterway P are made large enough to avoid this objection, then these parts would sometimes be undesirably large. Upon the down stroke, the large pump 0 dominates the smaller pump D and forces a relatively large volume of liquid at each stroke down through the piston D and thence following the usual course, which need not be described, into the force chamber F. In this way the head of the jack is rapidly pum ed up until it takes a bearing against its oad and if the load is not so great but that it can be handled by the large pump 0, then the work may be com leted by it in much less time and with less abor than if effected through the use of the more powerful, but slower pump D: If, on the other hand, the load is heavy and beyond the ability of the large pump to handle, then the operator turns the'crank V of the spindle over one quarter turn, and when the arts are in this position, the valve Q will be forced off its seat and held there by the cam action of the spindles against the upper end of the valve stem Q, thus putting the big pump O out of operation, its only effect being to churn a portion of the liquid back and forth through the waterway I and permanently 0 en valve Q. Meantime, however, the small: but powerful pump D is performing its functions in the usual manner.

Those who are familiar with this art will ap reciate the fact that because of my pecu iar' construction, I secure some im ortant advantages, among them the follow ng: The two umps are located at the upper and lower en s respectively of the ram, the pump chamber for the large one being made in the body of the ram itself. From this construction flow the following advantages: N o s ace is required in the head of the ram for the larger or upper pum Thus there is no encroachment upon the iquid s ace. Again in my pump, owing to the fact t at the pump chambers are connected by an open waterway, materially larger than the piston rod which passes through it, that waterway itself acts as art of the reservoir, thus-ma terially reducing the bulk, cost and weight of the structure as a whole. Again my piston rod being smaller than the two pump chambers and waterway which connects them and making no contact with the walls of either of these spaces, it need not be highly machined, but may be left relatively rough throughout most of its area.

The simplicity and effectiveness of the construction and o eration are apparent. The operatoris callbd upon to do no act whatever eXce t to move the little crank of the s indle to effect the substitution of the sma ler, but more powerful and slower moving jack for the more rapid but less powerful one. No knowledge of the interior construction is required and any one of ordinary intelligence can operate the apparatus.

It will be obvious to those who are familiar with this art that the details of construction above described and illustrated may be departed from and still the essentials of the invention be retained. That which is shown and described is one form only in whichthe invention may be embodied and I therefore do not limit myself to such details.

1. The combination in a machine of the so I-Iaving described my invention, I claimq class stated of two pumps of different capacities, both located in the ram of the jack, one

near the top of the ram, the other near the bottom thereof, both receiving their force liquid from the same reservoir and discharging it into the same force chamber.

2. The combination in a machine of the class stated of two pumps of different capacities, both located in the ram of the ack, one near the top of the ram, the other near the bottom thereof, the pistons of both pumps being mounted upon the same piston rod which is smaller than the pump chamber and connecting passages through which it passes, both pumps receiving their force liquid primarily from the same reservoir and discharging it ultimatelyinto the same force chamber.

3. The combination in a machine of the class stated of two pumps of different capacities, the chamber of the larger one being cut in the body of the ram near the top thereof, the smaller one being located near the bottom of the ram, the pistons of both pumps being upon the same piston rod which is smaller than the pump chambers.

4:. The combination in a machine of the class stated of two umps of different capacities located at di erent ends of the ram, a water space connecting the two pump chambers, both of the pistons mounted upon the samefpiston rod which is smaller than the pump chambers and connecting water space, an ingress valve in the smaller piston and means to throw out of operation the larger pump.

5. The combination in a machine of the class stated of two pumps of different capacities located at different ends of the ram, the

larger one discharging through an intermediate waterway into the smaller pump chamber and thence through the piston of the smaller pum and means whereby both pumps may e simultaneously operated or the smaller one only.

6. The combination in a machine of the class stated of two pumps of different capacities located at opposite ends of the ram, a

waterway in the ram connecting the pump chambers, a piston rod smaller than the the same force chamber,a checkvalve to prepump chambers and said waterway to which vent back flow from the force chamber and 0th the pistons are fastened, means to remeans to trip the check valve to permit back ciprocate the piston rod and pistons in lines flow. 15 5 parallel to the axes of the ump bores, a wai In testimony whereof I have signed my terway in the upper part oi the ram connectl name to this specification in the presence of ing the pump bores with the reservoir, a two subscribing Witnesses.

valve controlling said waterway, a spindle 1 JOHN WEEKS. actuated from the exterior of the structure 1 Witnesses: 10 adapted to engage with the stem of the valve ETI-IEL L. DUDGEON,

and hold it open, said pumps discharging into SILAs D. WRIGHT.

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