US1292355A - Valve mechanism for hydraulic presses. - Google Patents

Description

E. MUNGER.

' VALVE MECHANISM FOR HYDRAULIC asssrzs.

APPLICATION FILED JAN- 8.1918.

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APPLICATION FILED MN. 8. l9l8- Patented Jan. 21, 1919.

2 SHEETS-SHEET 2 Valve Mechanism distributing valve as it EUGENE MUNGER, OF BIRMINGHAM, ALABAMA, ASSIGNOR TO CONTINENTAL GIN COMPANY, OF BIRMINGHAM, ALABA MA, A CORPORATION OF DELAWARE.

VALVE MECHANISM FOR HYDRAULIC PRESSES.

Specification of Letters Patent.

Patented Jan. 21, 1919.

Application filed January 8, 1918. Serial No. 211,900.

T 0 all "whom it may concern:

Be it known that I. EUGENE MUNGER, a citizen of the United States of America, residing at Birmingham, in the county of Jeffferson and State of Alabama, have invented certain new and useful Improvements in for Hydraulic Presses, of which the following is a specification.

My invention relates to hydraulic pressure operated cotton trampers, baling presses and like mechanisms, and has for its object to design a mechanism for the joint manual and automatic control of the hydraulic valving mechanism which comprises a fluid distributing valve and a by-pass valve adapted to short circuit the predetermined conditions to prevent excessive pressure conditions arising in the distribution valve or the press cylinder and its piping system.

My invention is more particularly concerned with the mechanism for coordinating the manual and automatic control of the bypass valve at the completion of the followers power or down stroke, my purpose being to hold the by-pass valve open until the distributing valve shall have been reversed and then to cause the by-pass valve to automatically close so that pressure may build up in the press cylinder to raise the follower. My preferred means for obtaining this desired control of the by-pass valve contemplates the use of a floating lever connected to the by-pass valve and adapted to be operated to open the by-pass valve only by the joint action of a manually controlled cam and a follower controlled actuator, the cam being connected so as to move with the is manually reversed and being designed then to release the floating lever and permit the by-pass valve,

which is spring-pressed, to close automatically, whereupon the fluid pressure will become effective to raise the follower. The by-pass valve at the end of the followers return or-up stroke is preferably controlled and opened by direct lower, it being unnecessary in this case to i close the by-pass valve before the follower 50.

is started on its down stroke as it will, on reversal of the distribution valve, start down by gravity and permit the by-pass valve to close behind it.

distributing valve under action from the fol- My invention also comprises the novel details of construction and arrangements of parts hereinafter pointed out in the appended claims and illustrated only in their preferred embodiment in the accompanying drawings which form a part of this specification, and in which Figure 1 shows a hydraulic tramper mechanism with the follower at the top of its stroke and the cam and distribution valve in position before reversal to effect the down stroke of the follower.

Fig. 2 is a detail view of the by-pass valve in section with its control mechanism shown in elevation in the position assumed at the completion of the down stroke of the follower, and before the distributing valve and cam have been shifted to release the by-pass valve and raise the follower.

Similar reference numerals refer to similar parts throughout the drawings.

Asillustrated in the drawings, have shown my invention as embodied in .the valve mechanism for av hydraulic cotton tramper of any standard construction. all details of which are omitted from the drawings excepting its follower 1 which is shown attached to and operated by a piston rod 2 which is connected at its upper end to the piston 3 that is reciprocable in the press cylinder framing 5 and is connected at'its upper end by a pipe 6 to the valve chamber 7 of the casing 8 of the distributing valve 9. The lower end of the press cylinder is connected by a pipe 10 with the valve chamber 7, and fluid pressure is admitted to the chamber at a point intermediate the ports for the pipes 6 and 10 by a supply pipe a check valve 12 and a by-pass valve 13 disposed in a return pipe 14 leading to the source of fluid pressure (not shown). The

1. This cylinder 18 mounted on the- 11 having therein fluid pressure exhausted from the press cyl- I inder 4 by the valve 9 is returned to the source of fluid pressure by an exhaust me on December 31st, 1917, Ser. No. 210,951,

filed Jan. 8, 1918, but other suitable forms may be used. It is only necessary for the of this applicationjto state that the valve 9 is abalanced piston valve havaxial port with the imediately reduced so nect the supply pipe 11 with distribution pipes 6 operated, .the pipe not thus brought into is operated by floating lever communication with the source of fluid pressure being open to the exhaust. V Thevalve a stem 16 which passes out through a stuffing gland 17 in the casing 8 and is connected to a. hand lever 18 on one pivot 19 therefor. On the other side of-this pivot the lever 18 is connected by a link 20 with a crank arm 21 which operates a cam 22. This cam is preferably' formed as a member pivoted on a a bearing 24 and having a cam slot' therein which is peculiarly shapedv for the purpose of causing a guide pin, 23, which works therein and is mounted on one end of the 25, tobe raised and lowered l .a predetermined distance as the cam is I j -upwardly toits. I

1 the valve is balanced. The free end of the of the by-pass valve own to one or the otherof its extreme positions w1ththe reversing movements of 1, thecam hasbeen pi nearest the :pivotalcenter of the cam. whereas in ;F ig.2 the pin'is shown lowered to its with relation. to the pivotal cam. The floating lever25at 1 an intermediate point "is pivotally connected by a pin 26t0- the upper end of the stem 27 v 13.. A spring -28 acts on this by-passQvalv tonormally force it closed position in which 1 fioating. levgsr.is'disposed in'the path of an actuator 29' carried at the upper end of an upright rod 30 mounted on and reciprocable tuatorissuch that it path'of-a late 34 in position to engagenearend of the floating with the follower 1. .The position of the acitwill engage and depress the free endof the floating lever at the end. of the followerls down :or power stroke.

Alever 31- mounted on a fiied fulcrum 32 one end to the by-pass the other end carries an adjustable tappet or stop 33 disposed in the on the follower disposed the tappet and rock the lever'at theend .of the followers up' stroke, thereby automatically depressing and opening the bypass valve.

In operation-,-it will beobserved in Fig. 1

*- that the distributing valve and'the cam coni troller' for the fioatmg lever move together but in reverse directions, they being shown.

in this-view with the valve admitting pressure to the lower endlof the pre ss cylinder, as a result of which the follower has moved to the extreme of its up travel, leaviiig the lever 25-free while. the cam'end of the lever stands shifted to 23 to its position &

raised position nearest the pivotal center tr the cam. 1f now it is desired to cause a down orpower'stroke of the follower, the K position, see- Fig. 2, and this will result in I causing the-lever to rock on the valve stem and elevate its free end adjacent to the follower. The spring 28 will hold the lay-pass valve closed under these conditions and fluid pressure will be delivered through pipe 6 above piston 3' to start the down travel of the follower. As the latter approaches the limit of its down-stroke its actuator 29 will'engage the floating lever, which then becomes fulcrumed on the cam 22, and depresses it sufliciently to force the lay-pass valve to pen positiop, thus automatically short circuiting the distributing valve and press cylinder by diverting the hydraulic 'p'essure through pipe 14 back to the source o tri uting .systemwill prevent the building. up of hhgh'pr essur'es up the safetyvalve which would cause the disadvantages of-oper'ation pending, application. At the completion-of each down stroke (if the follower the by-pass valve is opened by the. joint action of the floatinglever of the cam 22 at one end and the actuator-29 at itsother end and the valve will remain in this open position until the lever- 18 is reversed to divert pressure to the" described inmy said pipe .10 and to restore the cam to the posilZIOD Sh OWII in Fig, outer end of the floating ,lever 25 and permit the by-pass valve to action of its spring 28, whereupon pressure "will build lip-under the piston 3 andlift the follower. The 0am and the distributing valve thus move together, the latter in conjunction with the actuator 29 giving the dc sired control of the by-pass valve at the completion of the power stroke of the press,

close responsive to the 1, which will raise the Edd whereas the lever 31 having the fixed'fulcrum will automatically operate to by-pass the fluid at the completion of the up stroke. .The reason it is unnecessary to develop a combined. manual and automatic control of.

the by-pass at the top of the follower stroke is that. the action of gravity on the follower will permit-it to drop suficientlyon the reversal of the distributing valve to clear the lever-31 and. permit close responsive to its gravity movement'is not bined automatic and through a floating lever, operate the bypass'at both lowers st ke. 7 In the case'oi a press where the follower isrequired to makea number of strokes and to move always to the bypass valve to spring, but where this obtainable, the commanual controller,

may be. applied to" ends of the fol- 2 I;

tramper or. like balingi I V the same point at the completion of its power stroke, Ihave found that as the cotton builds up under the follower it will cause the latter upon reversal of the distributing valve to rebound sufliciently to permit the by-pass valve to close without relying upon the cam or equivalent shifting fulcrum. In other words, under certain conditions a shifting fulcrum for the lever 25 is unnecessary and my invention therefore broadly contemplates that the operating connection between the distributing valve and the fulcrum for the lever 25 may be dispensed with, but such a connection is desirable'as it will cause the bypass valve to close in the desired manner under all operating conditions.

This invention is not intended to be restricted in scope to the specific embodiment shown, but contemplates such modifications as come within the spirit and scope of the claims.

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

1. In a valve mechanism for hydraulic presses, a fluid distributing piping system, a multi-ported distributing valve and a bypass valve included in said piping system, said by-pass valve being adapted when open to short circuit the distributing valve, manual, means for reversing the valve, an operating element for the by-pass valve, an actuator movable with the press follower, and an actuator movable with the distributing valve, said actuators being adapted to act jointly on said operating element to open the by-pass valve at the end of the followers power stroke.

2. In a valve mechanism for hydraulic presses, a fluid distributing piping system, a multi-ported distributing valve and a bypass valve included in said piping system, said by-pass valve being adapted when open to short circuit the distributing valve, manual means for reversing the distributing val vo, an operating element for the bypass valve, an actuator movable with the press follower, an actuator movable with the distributing valve, said actuators being adapted to act jointly on said operating element to open the by-pass valve at the end of the fol lowers power stroke,.said actuator movable with the distributing valve being adapted to release the operating element when the pressure is reversed to return the follower, and means to automatically close the by-pass valve when its operating element is released by said distributer valve actuator.

3, The combination with a hydraulic press having a follower, of a fluid distributing valve, a by-pass valve and pipe connections therefor to short circuit the distributing valve, manually controlled means to actuate ,the distributing valve, and mechanism responsive to the joint action of said manually distributing operated means and the press follower to open the by-pass valve at the completion. of the power stroke of the press, close the by-pass valve when released from said joint action, substantially as described.

at. The combination with a hydraulic press and its multi-ported control valve, of a selfclosing by-pass valve adapted when open to short circuit the press, a cam movable with the multi-ported valve, an actuator movable by the press, and means responsive to the joint action of said cam and actuator to open the by-pass valve at the completion of the power stroke of the press. I

5. The combination with a hydraulic press and its multi-ported control valve, of a bypass valve adapted when open to short circuit the press, acam movable with the multiported valve, an actuator movable by the press, means responsive to the joint action of said cam and actuator to open the bypass valve at the completion of the power stroke of the press, said cam being movable upon the reversal of the multi-ported valve to release the by-pass valve, and automatic means to close the by-pass valve, as and for the purposes described.

6. The combination with a hydraulic press and its distributing valve, of a self closing by-pass valve adapted when open to short circuit the control valve, a floating lever connected to the by-pass valve, an actuator move able with the press follower to engage one end of said lever upon the completion of the power stroke of the press, and a cam movable with said distributing valve and adapted to engage the other end of the floating lever, the joint action of said actuator and cam serving to open the by-pass valve, as and for the purposes described.

7 The combination with a hydraulic press and its multi-ported control valve, of a self closing by-pass .valve adapted when open to short circuit the control valve, an operating stem for the by-pass valve, a floating lever fulcrumed intermediately on said stem, mechanism to reverse said control valve, a camv movable with said mechanism and adapted to control oneend of said floating lever, and an actuator movable with the press follower and adapted to control, the other end of the floating lever at the completion of the followers power stroke, said cam and actuator serving jointly to hold the bypass valve-open until the cam is moved upon the reversal of the control valve.

8. The combination with a hydraulic press, its platen and fluid distributing valve, of a self closing by-pass valve adapted when open to .short circuit the distributing valve, a stem for the by-pass valve, a lever having a fixed fulcrum connected at one end to said stem and at the other end disposed to be engaged by the follower at the completion of its up stroke and moved to open the byand means to pass valve, and a second lever iulcrumed von said stem andhaving one end disposed said distributing poses described.

9. The combihation with a hydraulic press having a followera'nd a fiuiddistributing valve, of a by-pass valve and pipe connections therefor to short circuit the distributing valve, levera%e means adapted to helower at the end of itspower stro e to open the Toy-pass valve, and

operated b the 0 means to close the by-pass valve when said Ema-see o leverage means is released or f u brq pressure.

10. The combination with a hydraulic.

press having a follower and a fiu'id distributing' valve, of a by-pass valve and pipe connections therefor to short circuit the distributing valve, leverage means adapted to be operated 'by'the follower at each end of Y its travel to open the bypass valve, andmeans to closethe bypass valve during intermediate positions of the follower.

, In testimony whereof I afix my signature.

EUGENE MUNGER.

Witness:

NOMIE WELSH.

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