US2094752A - Packing means for hydraulic jacks - Google Patents

Description

H. R. RosENBl-:RRY ET A1. 2,094,752

PACKING ,MEANS FOR HYDRAULIC JACKS Original Filed Jan. 6, 1932 Patented Oct. 5, 1937 2,094,752 l PACKING MEANs Foa HYDRAULIC JAcKs Homer R. Rosenberry, Euclid, and Ray P. Rosenberry, Cleveland, Ohio, assignors to Carl W. Brand, Cleveland, Ohio Application January 6, 1932, Serial No. 585,004 Renewed July 7, 1936 4 Claims. (Cl. 286-26) This invention relates to packing means for hydraulic jacks, and the like, and the principal object of the invention is to provide new and improved packing means of this character.

In the drawing accompanying this specication and forming a part of this application, we have shown, for the purpose of illustration, forms which our invention may assume, and in this drawing: f

Figure 1 'is a vertical longitudinal sectional view of an embodiment of the invention,

lFigure 2 is a similar View of another embodiment of the invention, while Figure 3 is an enlarged fragmentary vertical sectional view of the upper end of the ram cylinder shown in Figure 2. y' vReferring to Figure l of the drawing, the invention is disclosed in connection with a hydraulic jack comprising a base 90 having a vertically extending substantially cylindrical wall 9| cast integrally therewith, which defines a reservoir 92 and which is provided with a handle 93 cast integrally therewith The upper portion of the wall 9| is internally screw threaded to receive a correspondingly threaded closure 94 which effectively seals the upper portion of the reservoir 92 and which is provided with an annular recess 95 in its lower surface forming a shoulder 96.

Also, cast integrally with the-base 90 is a centrally disposed vertically extending annular boss 9i which is internally screw threaded to receive the correspondingly threaded lower portion of a ram cylinder 98. The upper end ofthe cylinder 98 is provided with a reduced portion 99 for telescopic engagement within the recess 95, the shoulder 96 of which prevents any lateral displacement of the cylinder 98 and maintains the same in axial alinement.

Mounted for vertical movement in the ram cylinder 98 is a ram |00 provided with a piston '|0| at its lower end. The piston IOI embodies a packing member |02 of cup-shaped formation, which is clamped against the lower end of the ram by a screw |03. The screw |03 is provided with an annular recess |04 which is adapted to receive the depending flange of the packing member |02, the latter being provided with a beveled lower edge |06 which insures a. very accurate contact with the walls of the ram cylinder 98 when fluid pressure is applied.

The screw |03 is also provided with a centrally disposed recess |01 in its lower end which communicates with the recess |04 through ports |08, so that when uid is forced into the lower end of the ram cylinder it will enter the space between the flange |05 of the packing |02 and force the packing into intimate contact with the ram cylinder 98 when the ram is elevated.

The upper end of the ram |00 extends through a centrally disposed aperture |09 provided in the closure member 94, leakage of fluid at this point being prevented by means of a leather packing member l0 which is substantially of inverted L-shape in cross-section and disposed Within an internally screw threaded recess formed in the closure 94. This recess is provided with an annular outwardly and downwardly inclined shoulder ||2 for seating engagement with the horizontal flange H3 of the packing member H0. A washer H4 is threaded into the upper end of the recess and is adapted to not only compress the packing member ||0 into sealing engagement with the ram |00 but also to provide an upper bearing surface for the ram which is spaced from the lower bearing surface provided by Walls of the aperture |09 in the closure 94. The lower edge of the vertical flange ||5 of the packing member H0 is beveled as indicated at H6 so as to provide an annular opening Il'l adapted to receive uid leaking through the aperture 09, the pressure of which iluid maintains the flange ||5 in sealing engagement with the ram during the elevation thereof.

By means of this construction a very rigid and durable structure is obtained, in that the ram is provided with a two-point bearing surface adjacent its upper end, having a packing disposed therebetween, and the ram is also provided with a bearing surface at its lower extremity afforded by the screw |03 which functions as a pilot during the elevation ofthe ram, and maintains the ram laterally braced in axial alinement independently of the packing |02, and notwithstanding any wear to this member.

The upper portion of the ram |00 carries a jack-screw 8 which is threaded into an internally screw threaded sleeve H9 vdisposed within an axial bore for seating engagement with an annular shoulder |2| formed therein and which is maintained against rotation by means of a locking screw |22. 'I'he yupper portion of the jack-screw H0 is provided with the usual saddle portion |23 for engagement with the object being raised.

Fluid under pressure is supplied to the ram cylinder 98 beneath the piston |0| by means of a pump (not shown).

The escape of fluid from the ram cylinder 98 is controlled by means of a needle valve |24, the

ing handle.

communication between the interior of the Yram cylinder 98 andthe reservoir 6?. when thevalve i2@ is unseated. rhe outer end of the valve |24 extends through a packing ii'and is threaded into a plug |21 which is in turn threaded into a boss |28 formed on the wall 9| ci the 'reservoir' 62. The outer e t-remity of the valve |274 is provided with a pin |29 adapted to be engaged by a bayonet joint slot provided in a suitable operatn Figures 2 and 3 bodiment or" the invention which Yis substantially the same as that shown and described in Patent 1,876,023, granted to R. P. Rosenberry, September 6, 1932, and therefore need not be described in detail. in this particular form of the invention, a reservoir |36 and ram cylinder |3| are cast integrally with one another in side-by-side relation. A ram |32 is mounted for vertical reciprocation within the cylinderY |3| and is provided at its upper end with the usual saddle |33. The ram |32 `is disposed in spaced relation with the walls o'the cylinder lifthroughout its length and is `urged upwardly by displacement Ywhen fluid is forced into the cylinder |3l.

|34 controls communication between 'the cylinder |3| and the reservoir |35 through a port |35, which valve is closed when the ram is elevated and is opened to permit fluid to escape back to the reservoir |36 from the ram cylinder when it is opened, thus permitting the ram |32 toI be lowered.

According to the presentinvention the upper end of the ram cylinder |3| is provided with an internally screw threaded recess |36 formed at its lower end with upper and lower shoulders |31 andV |38 respectively. A washer |39 surrounds the ram |32 in seating engagement with the lower shoulder |36 and provides a lower bearing surface for the ram |32. Disposed above the washer |39 and also surrounding the ram`|32 is a leather packing member |46 having a vertical flange |i`|| which is beveled at its lower edge as indicated at H32 to provide an annularV passage |43 above the washer |35, and a horizontal flange lili which is disposed in seating engagement with the upper shoulder |3'a'.

rIhe packing member |40 is maintained in position and in sealing engagement with the ram |32 by means of a washer |45 which is threaded into the recess |36, and the inner edge of which is beveled to provide an annular passage |46 surrounding the ram. |32. The washer is also provided with a plurality of radially extending grooves itil for registry with an overflow passage |48 formed in the side ci the recess |36 for establishing communication between the recess |36 and the upper portion of the reservoir |30. Seated upon the upper face of the washer |45 is a second washer M5 which is disposed in spaced relation with therarn |32 and which provides a seat for a secondrleather packing member |50 having a vertically extending flange |5| and a horizontally extending flange |52.` The vertical flange |5| extends downwardly between the washer V|515 and the ram |32 and is beveled at its lower end as indicated at |53V to provide an annular duct |56. The horizontal ange |52 is maintained in seating engagement with the upper face of the washer |65 and in sealing engagement with the ram |32 by means of a third washer |55 which is also threaded into the recess |36, and which is provided with transversely extend- 7 ram in that there is shown another eml A needle valve inggrooves |56 adapted to be engaged by a suitable tool, such as a Spanner or the like.

By means of this construction, a three-point bearing of substantial length isprovidedA for the ram, thereby insuring that the ram is maintained againstV tilting, notwithstanding the absence of lateral support at its lower' end, such as is ordinarly provided by awpiston. Also, the anged packing members his and |56 provide a very effective seal for the upper portion of the they are'ofjiiexible leather and `quickly .respond to any internal pressure so as to intimately engage the ram and effectively prevent leakage. The lower packing Vmember |40 forms a main packing member, while the upper packing member |56 functions as a wiper for preventing the escape of any fluid which might leak past the lower member |56. Any fluid passing the member le@ is collected in the groove |46 and returned to the reservoir through the port |48, thus resulting in a practically leak proof construction. `Before the jack is initially operated, the pressure within the jack is equal to that of atmosphere.V Upon the iirst Yupward. movement of the ram, air from the outer atmosphere is drawn past the packing member |56 and into the upper portion ofthe reservoir |30. VOf course, there'is no leakage of iiuid under these condiingY the valve |311, this air is compressed in the Y reservoir |36 VVand exerts pressure on the upper lowered, and results in a mechanism the exterior of which is at all timesY free from oil and the dirt accumulated thereby.

It will Ybel understood by Vthose skilled in the art that the embodiment. herein disclosed accomplishes at least Vthe principal object of the invention, that Vit has uses andradvantages other than those herein particularly referred to, and that various changes and modifications may be made without departing from the spirit of the invention, andaccordingly, the embodiment herein disclosed Yis illustrative only, and ourinvention isY not limited thereto.

, We claim: 4

Y l. Backing means Vfor relatively movable members, wherein the rst of said members extends into the second member, the second'member having a bore and a threaded counter-bore, through which said first member reciprocates, thedening wall o said bore being spaced a predetermined distance from said iirst member, and the defining wall of said counter-bore being spaced a greater Vdistance from said rst member; said bore being separated from said counter-bore by an annular shoulder, the supporting surface of which is inclined from the edge of said shoulder awayrfrom said rst Vmember and from said counter-bore; a

packing member having' aportion disposed in said bore and provided with a beveled surface inclined in a direction opposed to the direction of inclination of the supporting surface of said Shoulder, and having an integr-al portion seated upon said shoulder, formed to conform tosaid inclined sup- Y porting surface; and a securing member threaded Vinto said counter-bore for securing said packing member in position, and operating to compress fthe packing member between itself and the edge of said shoulder.

tions. When the ram |32 is lowered by operat- 2. Packing means for relatively movable members, wherein the rst of said members is elongated and extends into the second member, the second member having a bore and a threaded counter-bore, through which said rst member reciprocates, the defining Wall of said bore being spaced a predetermined distance from said first member, and the dening wall of said counterbore being spaced a greater distance from said first member; said bore being separated from said counter-bore by an annular shoulder, the sup*- porting surface of which is inclined from the edge of said shoulder away from said first member and from said counter-bore; a p-acking member having a portion disposed in said bore and pro vided with a beveled surface inclined in a direction opposed to the direction of inclination of the supporting surface of said shoulder, and having an integral portion seated upon said shoulder, formed to conform to said inclined supporting surface; a securing member threaded into said counter-bore for securing said packing member in position, and operating to compress the packing member between itself and the edge of said shoulder; a ring of a diameter similar to the diameter of said shoulder, disposed in said counterbore, resting upon said securing member and having a supporting surface disposed substantially at right angles to the longitudinal axis of said rst member; a packing member having a beveled portion disposed between said first member and said ring and having an integral portion seated upon the supporting surface of said ring; and a second securing member threaded into said counter-bore and having an inclined surface for clamping said packing member between itself and the outer corner of said ring.

3. Packing means for relatively movable members, wherein the first of said members extends into the second member, the second member having a bore and a counterbore through which said rst member extends, said bore and counterbore being separated by an annular shoulder, the surface of which is inclined away from said counterbore; packing means disposed in said counterbore and bearing on said shoulder; and clamping means secured in said counterbore and operating to compress said packing means between itself and the edge of said shoulder.

4. Packing for longitudinally extending relatively movable means, comprising: packing material; and longitudinally spaced clamping means interposed between said movable means, fixed with respect to a iirst of said movable means, and having spaced surfaces extending at converging angles toward the longitudinal axis of the other of said movable means, one of said surfaces terminating short of said other movable means, and said surfaces being operable to clamp said packing material between said shortened terminal and the other of said surfaces; said packing material having an extension disposed between said shortened terminal and the other of said movable means, and said extension being provided with a beveledy edge inclined from a point adjacent said other movable means in a direction toward said shortened terminal portion.

HOMER R. ROSENBERRY. RAY P. ROSENBERRY.

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