US302070A

US302070A - Thomas h

Info

Publication number: US302070A
Authority: US
Publication date: 1884-07-15
Anticipated expiration: 1901-07-15

Description

' (No Model.) A

, T. I-I.v WATSON. HYDRAULIC JACK.

Patented 884 2 Sheetsf-Sheet 1.

INVBN'TOR:

ATTORNEYS.

(No Model.) 2 sheets-.sheet 2.

T. H.. WATSON. HYDRAULIC JACK-- No 302,070.' Patented July 15, 1884.

AWTTNTssE's: K TNVENTOR; j @QQ/ .7 6. man

X I' I ATTORNEYS;

lIO

y UNITED STATES l PATENT OFFICE.

THOMAS H. TVVATSON, lOF BROOKLYN, NEW YORK, ASSIGNORTO HIMSELF AND FRANCIS H. STILLMAN, OF SAME PLAGE.

HYDRAULIC JACK.vr

SPECIFICATION forming pa'r't of Letters Patent No. *302,070, dated July l5, 1El84. i

d Application filed December 2G, 1883. (No model.)

5 useful Improvements in Hydraulic Jacks, of

which the following is a full, clear, and exact description.

The object of this invention is to provide a simple and effective hydraulic jack which may safely be worked by unskilled labor, and isconstructed for easy access to its parts for clean ing,-repair, or renewal.Y

The invention consists in certain improvements in the pump-'cylindcr,wliereby the backthe face, against which the plunger or piston acts, and also in improved arrangements of the valves of the ram and the pump-plunger, and also in an improved contrivance of the and relatively with the head of the jack, whereby provision is made` for easy, effective, and guarded action of and access to the valves; and the invention consists, also, in various constructions and combinations of parts -of the jack, all as hereinafter fully described and claimed. i

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the gures.

Figure l is a vertical sectional elevation of my improvedjack. Fig. 2 is a likevview, enlarged, of the lower end of the ram. Fig. 3 is 5 a sectional plan view on the line l 1, Fig. 2.

Fig. 4 is a plan View of the lower valve-plug and valve. Fig. 5 is a vertical sectional elevation of the pump plunger, drawn lto the scaleof Fig.' `2. Fig. 6 is a sectional plan View on the line 2 2, Fig. 5. Fig. 7 is a side elevation of the jack, with the working-lever partly brokenaway. Fig. S is a sectional plan view of the jack; and Fig. 9 is a detail plan View of the shaft and lever-socket, with parts of the head in section. The letter A indicates the main cylinder vo the jack, which is supported on any suitable basel3. O is the ram,which ilow passages for the liquid are removed from.

shaft'on which the .plunger-rod arm is lixed,

is screwed into ,the head D, .and together forming the lquidreservoir of .the jack. f

E is the pump-cylinder, made either in one piece with the ram or separately therefrom.

If separately made, as shown, thecylinder E is fitted up into the ram with a shouldered joint at c, to limit the rise of the cylinder E, when the lower valve-plug, F, is screwed into the lower end ofthe ram, a packing, Gr, being plug F is centrally bored at F', `to receive the lower valve, K, the stem K of which is re'- duced in size, as at lc, for free passage at 7c', either way, ofthe `forcing liquid when the valve is open. in a chambenj, of bonnet J, into which chamber vpassages j lead from the space in cylinder A below the ram; and the valve-plug F has passages f1 opening into the bore F and diverging upward,to communicate with passages e, formed in the walls ofthe pump-cylinder E, and outside of or behind thebore of thecylinder in which the plunger L works. sages e' connect the bore of cylinderE with the passages e, f, k', j, and y", all being con- Pas- The valve-head has free play trolled by the valve K, which is normally forced upwardl by a spring, J', in chamber j, to be seated against the lower face of plug F, or against a removable seat, F2, fitted therein, as shown. I form a depression, f', in the top face of plug F,-to establish free circulation bei forming a projection orv stud, L2, which is eX- ternally screw-threaded to receive the internally screw-threaded ring M, by which the packing N is held to place. The ring M also receives the externally-threaded bonnet O, chalnbered at 0 for play of the valve I, and having passages o', opening from chamber o' to the bore of the cylinder E. The valve I has a stem, P', which is reduced at p, forming passages p', which connect with passages Z, opening into the bore of cylinder E above the plunger-head. A lateral passage, Z', opening into the bore I for the valve-stein I, permits free escape of air or liquid from above the valve-stem head to facilitate free upward play' M N firmlyto place, also permitting theirA ready removal when required. The plungerrod Q connects pivotally to the rock-arm R, which has preferably a square or angular f1t upon the shaft S, which carries at its outer end a socket, T, for the workin glover U, which has a projection, u, on one side or edge, to strike against a stud or stop, V, fixed on head D, when thejack is lifting.

To make provision for removing the shaft S, with its lever-socket T, without faking the jack apart for repacking the shaft, I make the shaft with the round bearing portion s next the socket T, the smaller square or angular portion s to receive and fit arm It, andthe still smaller end portion s2, parts s s being suitably journaled in the head D. This head has a screw-plug, d, which may be removed for charging the jack with the forcing-liquid, and for access to a setscrew,1', passing through the arm It for binding it firmly to the shaft S. At the side next socket T the head D is recessed, as at D', to afford space for the gland XV, which is threaded into head D, and forms part of the bearing for portion s of shaft S, which 'latter may be annularly greoved at x to receive the packing X, which is forcedinto the groove by screwing up the gland, and serves to lock or aid in locking the shaft against endwise movement in the head, and closely packs the shaft against escape of the 'forcing-liquid; and as further and a principal means to prevent endwise movement of the shaft S, a screw-pin, Y, is passed through the head and engages by its point an annular groove, y, in part s ol' the sha'ft, as indicated in dotted lines in Fig. S, and in full lines, Fig. 9. Any suitable packing, Z, secures a tight loint at the base of the main cylinder A.

In operating the jaek,it is first charged with liquid, preferably spirits, the ram being down. The lever U is placed in socket T, with its projection u downward, to strike against a stop, V, on the head D, to limit the downstroke of plunger Il, and prevent its opening the passages c while the jack is lifting by a rise of the ram caused by the reciprocations of the lever. O11 the upstroke of the lever U the plunger-valve l? will open by the weight of the liquid, which will escape through passages Z p o o to the bore of the pump-cylinder E,and on the downstroke ofthe levervalve l? will close, and theliquid willbe forced through passages f', f, l.r,j, and j to the main cylinder A, for lifting the ram with a power 'properA tionate to the areas of the plunger or piston L, and the ram. To lower the ram, the lever U is reversed in socket T, or placed with projection u upward, so that the socket will strike the stop, and the plungerli may then be abnormally lowered until below passages c', and the bonnet O strikes the stem l and opens valve K, thereby affording free upward flow ofthe liquid, through ample passages j', j, k, f, f, c, and c above the plunger, into the hollow body of the ram, which is allowed to fall quickly, thereby economizing time in preparing for the next lift, and the spring J seats valve Ii after the rise ofthe plunger.

Some of the advantages of my invention may be named as follows: By' forming the backflow passages c behind the bore of the cylinder E, instead of along the face ofthe bore, as heretofore made, the plunger works much more smoothly and tightly, and without cutting or tearing of its packing, while every necessary freedom of back-flow is allowed for a quick fall ofthe ram. The ram may be lifted from the cylinder A, and iis bonnet J' and ring H Iemoved to renew the paekin g I and regri nd the valve-seat or valve K, and plug I" may also readily be removed to renew packing G, and when the shaft S is to be withdrawn the setscrews r and Y, if either orboth are used, are loosened, and gland XV turned back, which loosens the packing X from the groove x, (if the groovefis employcih) whereupon the shaft may be partly drawn out from the head without leaving its bearings, to permit socket T to be swung down clear ofthe face of projection V, for carrying the plunger-head sufficiently below the foot of the cylinder E to permit easy access to the parts for repair or renewal of the packing and valve N I without taking thejack apart, as formerly required.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

I. A hydraulic jack having the back-flow passages c within the walls thereof, and lateral openings e leading from the interior to the passage c, said lateral openings being below the upper end of the piston-head in its normal stroke, whereby the back-flow of the liquid is prevented until the pistondiead is forced below said lateral openings, substantially as set forth.

2. The combination of the ram C, pro-vided with a pump-cylinder having vertical passages c within ifs walls, and lateral apertures c at the upper ends of said passages opening into the pump-eylinder, with the plug F, screwing into the ram below the pump-cylinder, and provided with a valve and passages communicating with said passages c, substantially as set forth.

IIO

- lower end of the piston to be projected beyond 3. The combination, with the 11am C, pump.- cylinder E, and valve-plug F, of, the packing G, substantially as .shown and described. 4. The combination, ina hydraulic jack, of the ordinary reversiblel lever U, socket T, and

stoplug V, with arni R, the shaft S, journaled `in the head D, and provided with an annular groove, y, and a screw or pin, Y,passing'fron1 'the outside of the headto the said groove,

whereby when the said screw is removed the shaft may be moved laterally and the socket allowed to pass the lug, thereby allowing the the end of the pump-cylinder.

5. Ahydraulic jack provided with a pulnpf cylinder and a screw valve-plug beneath the same, in combination with the piston secured to anarm, R, shaft S, carrying said arm, and provided with an annular groove and a screw `or pinpassing through the head into thezo groove, whereby when the screw-plug is re- Witnesses:

EDGAR TATE, ALFRED H. DAVIS.