US971714A - Hydraulic jack. - Google Patents

Description

ml WOMBINGTON, OI" IOOTLAND, PINNBYLVAIiTIA.

mums JACK.

Ipeeltlcstton Letters Intent.

Patented Oct. 4,- 1910.

To all whom it may concern:

Be it known tl.r.t I, Bmmr. Wonrnmcrun, a citizen of the United States, reeidinp' at Scotland, in the county of Franklin and State of Pennsylvania, have invented certuin new and useful Improvements in llydrnulic Jacks, of which the following is u specification.

My inveption relates to improvements in hydraulic acks the object of the invention being to H'UVlt e an im iroved jack of this type Wllitl can be reudi y and quickly positioned below and against. the work, and thus save time and etxmouiize labor. lleretotore, in jacks of this type, it has entailed a considerable loss of time, ufter the jack has been placed in position below the work, to move the plunger up into contact with the work and in a position to lift, and to overcome this defect my invention was devised and will now be described in detail. I

with these and other objects in view the invention consists in certain novel features of construction and combinations and ur rangements of parts as will be more fully hereinafter described and pointed out in the claims. 7

In the set nnpsnying drawings: Figure 1 is a view in vertical, longitu incl section illustrating my improvements, and Fig. 2 is a view in side elevation. I

1 represents a base upon which two vertical, parallel cylinders 2 and 3 are made into 'ral, the cylinder 2 constituting the wor ing cylinder, and the tglinder 8 my improved storage cylinder. id cylinders at their lower ends being connected by a pipe 4, in which a valve or cock 5 is provided to open and close communication between the cylinders.

6 re resents the inlet duct, which may be form in the castingd in various ways, but. preferably bored, sin its lower end by means of a screw plug 7, and screw threaded at its upper end for the reception of a coupling 8 to connect duct 6 with a source of liquid supply. This duct 6 communicates at its lower em w in base 1, said duct 9 communicating with ith a duct 9 the center of cylinder 2at the bottom there- .of and a cock or valve 10 is rovided in duct i' 6 to control the flow of liquid therethrough while a cock or valve 11 in the lower end of cylinder 2 is provided to permit a reduction ';'-of pressure in the cylinder whenever desired. plunger or ram 12 is mounted to move- .operutor' o bore being closed at vertically in packed as at 13.

1n the storage" eyliuderitl,

a piston 14. is mounted, and m nnitably packed as shown cylinder 2, and is saitebly at 15. This piston 14 I8 normally pressed.

downward by means of two nested springs 16 and 17, both ofi-thcn1 bearing a inst a. cap plate 18, screwed into the three ed open upper end of cylinder 3, and having an angular enlargement 19 thereon for the reception oi. n wrench to turn the same. The smaller and inner sprin 16 bears within the recessed upper end 20 0% larger spring 1? bears a a'iLn-itthe upper face of said piston outside 0 recess 20.

'l'hdoperution is its follows: Assumin that the plunger or ram 12 is bcinelevate by means of the premium of liquicf below in cylinder i2,'supphed throu h duets 6 and 9, valve 10 being open, if va ve 5 is o med at the same time, this liquid will use flow through pipe 4 intothe lower end of cylinder it. below piston 14. Hence, an the plunger or rain 12 is moved upwnrd the pressure in cylinder 3 will also move piston 14 upward ninst the pmssnre of sprin 10 and 17. hen the piston or ram 12 IS moved upward as: far as desired, the first thing the operator does is to close valve .3, as well as valve 10. Then by opening valve 11, the liquid below piston or ram 12 is forced outby the weight of the'rnm, when the latter lowers. atl'ect the pressure in cylinder 3, an when the jack is placed below the work the us valve 5. The li uid in cylinder 3 )8 then forced through t to pipe 4 into cylinder 2 and quickly elevates t e ram or ilunger'tnto engagement with the work. he operator then opens valve 10 and the pressure of liquid from its source is supplied through the ducts 6 and t) and the operation is re tented as above explained. Various slight c anges mightbs made in the general form and arrangement of parts described without degarting from my tnvention and hence I to the precise detsilsset fortlnbut consider myself at libert to make such changes and piston 15, while the llowever, this d yes not' alterations as airly fall within'the spirit and scope of the appended claims.

Having thus described my invention what I claim as new a nd desire to secure by Letters Patent is 1. A hydraulic jack, comprising two parallel cylinders, one constituting a working cylinder, and the other a storage cylinder, a

of the storage cylinder, nested springs boaring at one end against said cap plate, and at their other ends against piston in the st piston or ram in-the workin cylinder, a {)iaton in the storage cylin er, a screw hreaded cap plate in the upper end of the sto cylinder, elastic devices between the cylander, adpipc connecting the lower ends of sax cyhn era, a valve Ill said pipe, said wor linder havin an inlet asaage with its lower end, 2 valve ens p ate and the piston in the storage cylin er e'erting downward nessure on said piston, a pipe connecting t e lower ends of mid cylinders, a valve in said papeysaid said and a valve normally closworking cylinder having an inlet passage mg an outlet to the lower end of said workoomnyuriicating with it; ower end, a valve i cylinder.

cylinder, a piston in the storage cylinder, a

l In said and a valved outlet in the n testimony whereof I have signed my lower end' said working cylindea, sub name to this epecification in the presence of tantially as described. two subscrib ng witnenaes.

2. hydraulic jack, oomprisingn casting forming parallel cylinders, one constituting a working cylinder, and the other a storage cylinder, a piston or ram in the working BLAINE won'rmm'rcm.

We it aw Amen P. Bm n c ir.

screw threaded cap plate in the upper endv

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