US1189815A - Valve device for hydraulic jacks. - Google Patents

Description

D. E. HENNESSY.

.VALVE DEVICE FOR HYDRAULIC JACKS.

APPLICATION FILED .IULY I9. I9I3 Patented July 4, 1916.

Wh n /M d .6 d L f n \\\w www m 1 E kvw w m S 1 1 L m 4 1 A eae ..1 .`\1/ 1.0; G. @u Q @Z L 0%.

Ato

ideama@ v DANIEL n. HENnnssY, or nonronnjirassaonusnrrs, assreivon, BY MESNE ASSIGN- Mnn'rs, To HERBERT wcowan, J. enivre wrcnorr, ann EDWARD N. WHITE,

ventinay :envien non, HYDRAULIC lMens.

ToaZZ 'whom z't may concern.'

Bel it known that I, DANIEL E. HENNEssr, a citizen of the United Sta-tes, residing at Holyoke, Massachusetts, have invented cer tain new anduseful Improvements in Valve Devices for Hydraulic Jacks, of which the following is a clear, full, and exact descripn tion. Y

This invention relates to animprovement in hydraulic jacks, and has for its'object the improvement of the same both as regards eliiciency' in operationand economy of construction.

In the preferred embodiment of my invention shown in the drawings, Figure 1 is a longitudinal section of such a jack, a portion of thel operating handle and ram being cut away; Fig. 2 is a cross section through line. 2-2 of Fig. 1; Fig. 3 is an end view looking from the left of Fig. 1; and Fig. 4 is a detail longitudinal section showing a modification.

Referring moreparticularly to the drawings., a cylindrical shell 1 preferably made of one integral piece has formed therein a pump chamber 3 and ram chamber 2, prei-y erably arranged in tandem. A pump piston 5 is adapted to work back and forth in the pump chamber, and a ram 40 is adapted to work in the ram chamber 2. Preferably concentric with the shell 1 is formed an annular reservoir chamber 27 having outer wall 6, and it is understood that this reservoir chamber is adaptedto contain the iuid for operating. the jack whether it be air, water or any other similar means.

The pump piston 5 may be operated back and forth by any suitable lever arrangement, 1

part of which is shown by lever 26 pivoted at 7 on bracket 12, and connected at 8- to the end 9 of said piston 5. rlhe piston 5 is also preferably formed with a shoulder 10 for limiting its inward travel, either by abutting against the end -of the shell 1 or against a stop 11 as shown in Figs. 1 and 3. justable stop 11 in the present embodiment consists merely of a pivoted latch, which in its vertical position as shown in Fig. 1 is adapted to stop the inward travel of the pump piston before shoulder 10 reaches the shell l buty which in its horizontal position shown by dotted linesv in Fig. 3 allows said ,i gpeyziiioatilmv pfLetters JPatent. Application tiled July 19, 1913. Serial No. 779,903. y

Patented July 4, 1916..

pump piston 5 to move farther on into the pumping chamber for a purpose to be presently described.

Communicaton between the pumping chamber 3 andreservoir 27 is effected vthrough port 19 and communication between pumping chamber and the ram chamber 2 is..

eifected through port 13. Puppet valves 20 and 4 are arranged to be seated upon the `ports 19 and 13 respectively.

` in the present embodiment the preferable arrangement and construction of the puppet valves and their ports are as follows. Intermediate between the pumping chamber 3 and ram chamber 2 is arranged a body member 29 having cylindrical portions, oney for i fitting the inside of chamber 3 and one for fitting the inside of chamber 2. This intermediate body member 29 may be of one integral piece and preferably serves as a common cylinder headfor both chambers 2 and 3. As seen the ports 19 and 13 are formed in this body member29 and valve 4 has a stem 15 passing through said body member. At the pumping chamber side of the body member 29 is preferably formed a lever supporting portion 25,which also may be in.- tegral with said body member, and this supporting portion 25 as shown in Fig. '2 provides va guiding support for the stem 21 of valve 20 andthe stem 15 of valve 4. A coil spring 22 surrounding valve stem 21 tends to seat the valve 20 in one direction, and a coil spring 16 surrounding stem 15 tends to seat the valve 4 inthe opposite direction. Loosely mounted upon the support 25 is a lever or movable device 23 having a projecting boss 24 serving as a fulcrum therefor, which lever 23 engages-beneath head y18 of valve stem 15. and head 30 of valve 21.

ln Fig. 4 a modification of the device is' In the embodiment of the invention shown in Fig. 3 and the pump piston 5 is thrust farther into its chamber so that the end of the same comes into positive enga-gement with the head 18 of valve stem 15 to open said valve 4'4 against its spring. At the same time lever 23 is rocked to move valve stem 21, 30, in the opposite direction and open valve 20. In

this way both Valves areoperated by the inward movement of the pump piston so asv to be open at the same time, and communication is opened from `thel ram chamber 2 through pump chamber-.3, to reservoir 27, whereby thed uid flows back immediately and allows the load to lower.

In the embodiment of my invention shown in Fig. 1 the ram may be released by an adjustment of the separate latch-piece 11 and the operation of the piston as described, but

in Fig. 4 a modification is shown in which no separate latch-piece-is required and the ram may be released at anytime by a continuous inward movement of the pump piston. To provide against releasing the ram at times when it is not desired, that is during the normal operation of the pump, a warning is given to the operator which will enable him to stop moving the piston inwardly too far. This warning is accomplished by opening the valve 20 prior to the opening of valve 4, whereby the inward movement of piston 5 causes first a slight release of pressure in front of the piston before the valve leading to the ram chamber has been opened. This preliminary release of pressure gives the operator warning that he has moved the piston 5 too far inwardly and that if he doesnt wish to release his ram he must immediately stop the Jfurther movement of his piston or move it in the other direction'. 'The opening of valve 20 before the opening of valve 4 is accomplished in the present embodiment by providing lost motion between the end of the piston 5 and head 1 8 of valve stem 15. As shown, the lever piece 23a is provided with an extension 28 above said head 18, whereby the piston 5 inits inward movement engages first-extension 28 to rock lever`23a and open valve 20, and later lbrings said extension into conta-ct with head 18 to open valve 4. i

It is to be understood that the embodiment of my invention hereinshown and described 1s merely one practlcal construction of the same, and that equlvalent varlatlons may be a separate valve for each port movable in opposite directions for beingopened, manuall operated means for opening bothl offsaid valves together forgiving communication between said ram chamber and said 'reservoir, comprising a rocking member lfor transv`mitting movement to one of said valves in a reverse direction to that ofthe? other valve.

2. In a hydraulic jack in combination, a pumping chamber having a piston therein, inlet. andv outlet ports at 'one end of said pumping chamber opposite the endl of said piston, a separate valve for each port located directly in front of saidpiston, and means for opening both ofsaid valves by a positive engagement with said pump piston when the same is moved in one direction.

3. In a hydraulic jack in combination, a pumping chamber having a piston therein, inlet and outlet `ports at one end 'of said pumping chamber opposite the vend of said piston, a separate valve foreach port, and means for opening both of said valves together by a positive engagement with the inner end of said pump piston.

4. In a hydraulic jack/in combination, a pumping chamber having a piston therein, inlet and outlet ports at one end of said pumping chamber opposite the end of said piston, a separate valve for each port, and means for opening both of said valves by a v positive engagement with said pump piston when the same is moved in one direction, comprising a rocking member acting to transmit movement to one of said valves in a reverse Vdirection to that of the other Valve.

5. In a hydraulic jack in combination, a.

pumping chamber and a ram chamber arranged in tandem, said pumping chamber Ihaving a piston adapted to work therein,

for opening both of saidvalves bya positive engagement with said pumping piston when the same is moved in one direction.

6. A hydraulic jack having a valve device removably mounted therein, comprising a bodyy member with two separate ports menait for closing said ports, stems on said valves slidably 'mountedon said bod member, a lever support and a lever roc ing on said `support and engaging said valve stems for transmitting movement to one of said valves i in a reverse direction to that of thel other valve.

8. ln a hydraulic jack in combination, an integral cylindrical shell having a pumping chamber anda ram chamber arranged in tandem, a removable intermediate body member serving as a common cylinder head for both said umpingand ram chambers, inlet and out et ports for said pumping chamber, separate valves 'for said ports, and means for opening both of said valves to.- gether by said piston when the same is moved in one direction. s

9. In a hydraulic jack in combination, an

"integral cylindrical shell having a pumping chamber and a ram chamber arranged in tandem, a removable intermediate body member Serving as a common cylinder head for both said umping and ram chambers, inlet and out et ports for said pumping chamber formed in said body member, separate valves for said ports, and means for. opening both of said valves together by the inner end of Said piston.

l0. A hydraulic jack having in combination, a reservoir chamber, a pumping chamber, a ram chamber, a Acommunicating port between said reservoir and said pumping chamber, a communicating port between said pumping chamber and said ram chamber, a Working fluid confined in said jack, a pump piston working in said pumping chamber, valves for said ports arranged to be opened alternately by the normal pump,- ing action of said pump piston to transfer fluid from said reservoir to said ram chamber and an independently movable device adapted when operated to open both of said valves so that said valves will be open at the same time in order to allow fluid to flow back from said ram chamber to said reser- VOlI'.

11. A hydraulic jack having in combination, a reservoir chamber, a pumping chamber, a ram chamber, a communicating portbetween said reservoir and said pumping chamber, a communlcatmg port between said pumping chamber and sald ram chamber, la

.pump piston working in said pumping chamber, valves for said ports arranged to t1on, a reservoir chamber,

be openedalternately by the normal pump-l .ing action of said pump piston to transfer Huid from said reservoiry to said ram cham# Yber and a movable device connected with both of said valves adapted when operated to open both of said valves so that said valves will be open at the same time in order to allow Huid to ow back from said ram chamber.

12. A hydraulic jack having in combination,a reservoir chamber, a pumping chamber, a ram chamber, a communicating port between said reservoir and said pumping chamber, a communicating port between pump piston working in said pumping chamber, valves for said ports arranged to be opened ing action Huid from said reservoir to said ram chamber and an independently movable device adapted When operated to open both of said valves so that said valves will be open at the same time in order to allow fluid to lllow back from said ram chamber to said reservoir and manuali controlled means for operating said Inova le device to release said ram.

13.y A hydraulic jack having in combinaa ram chamber, and a pumping chamber, an inlet port from said reservoir to said pumping chamber, an outlet port from said pumping chamber to said ram chamber, a working Huid conlinedA in said jack, a pump piston working in said pumping chamber, an inlet valve and an outlet valve for said respective ports arranged to be opened alternately in pumping huid from said reservoir to said ram chamber 'and means operated by the inward movement of said piston beyond its normal expelling stroke to open both of said valves so that said valves will both be open at the same time to allow iuid to flow back from said ram chamber to said reservoir, said means being constructed and arranged to open said inlet valve slightly in advance of said outlet valve.

14. A hydraulic jack having, in combination, a reservoir chamber, a pumping chamber, a ram chamber, communicating ports respectively between said reservoir and pumping chambers and between said pumping and ram chambers, a pump piston working in said pumping chamber, valves for said ports, and valve opening means separate from the piston but arranged to be engaged and operated thereby and constructed to open both of said valves in a predeterf mined order.

15. A hydraulic jack having, in combination, a reservoir chamber, a pumping cham- 'said pumping chamberY and said ram chamber, a working fluid confined in said jack, a`

alternately by the normal pumpy of said pump piston lto transferl ber, a ram chamber, communicating ports respectively between said 'reservoir and pumping chambers and between said pumping and ram chambers, a pump piston Working in said pumping chamber, Val-ves for said ports, and valve opening means sepap rate from the piston but arranged to be 'engaged and operated thereby and con- Istructed tgmcpen the Valve between the res-

Images