US1523425A

US1523425A - Operating valve for hydraulic presses

Info

Publication number: US1523425A
Application number: US665404A
Authority: US
Inventors: Thomas B Jones
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-09-28
Filing date: 1923-09-28
Publication date: 1925-01-20
Anticipated expiration: 1942-01-20

Description

Jan, 20. l1925.

f 6` l n q Y/ 32 7/'5` .v 11 as l 1,? 74 Inventar FII MJD v8 Q22;

Patented Jan. 20, i925.

@METEO STATES THOMAS B.'JONES, 0F TORONTO, ONTARIO, CANADA.

OPERATING VALVE FOR HYDRAULIC PRESSES.

Application filed September 28, 1923.

To all 'whom t may concern:

Be itknown that I, THOMAS B. JONES, a Subject of the King of Great Britain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in an Operating Valve for Hydraulic Presses, as described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of the invention are, to provide a means for automatically vibrating the press plunger following the initial operation, and to devise a simple valve structure which may be easily regulated.

The principal feature of the invention consists in operating the pressure control valve to the press with an intermittent movement by means of a plunger hydraulically operated with a. reciprocating action, the hydraulic operation of the plunger being opposed to a resilient medium.

In the drawings, Figure 1 vis a longitudinal sectional view of the main press operating valve.

Figure 2 is a longitudinal sectional view of the valve for effecting the vibratory action.

In the operation of hydraulic presses it has been the custom to operate the control valve directly by a rotatable handle turning a threaded stem which engages the fluid control valve, lifting it from its seat and allowing the pressure to flow to the ram piston.

In certain classes of work it is desirable to impart a vibratory or hammering action to the rain of the press and it is to accomplish this action automatically that this invention has been devised.

In the construction herein shown, the main valve consists of the valve body 1 having the inlet port 2 from the pressure fluid supply controlled by the valve 3, the stem 1 of which extends .into the discharge chamber 5.

The plunger 6 operating in the discharge chamber and forming a communicating pas'- sage to the exhaust chamber 7 is operated by the plunger 8 which is slidably arranged in the upper end of thevalve, said plunger being held. upwardly clear of the plunger' G by an encircling coiled compression spring 9.

The automatic controlling .member illustrated in Figure 2 is preferably arranged in alignment with the plunger lof the valve 1 and comprises a substantially cylindrical Serial No. 665,404.

body 10 in which is formed a plunger cylinder 11 at the lower end. This cylinder is closed by a threaded gland 12 having a central cylindrical opening 13 in which the plunger rod 14 is guided. A packing washer 15 encircles the plunger rod at the inner end of the gland.

The plunger rod 14 is formed with a cylindrical enlargement 16 which is a sliding fit in the cylinder 11 and against this enlargement is secured the cupped pump washer 17 which is secured in place by a nut 18 threaded on the plunger.

The plunger rod 1a extends into a cylindrical chamber 19 in the body 10 and isprovided with a cupped end 20.

A spiral compression spring 21 engages the cupped end 2O of the plunger rod 1a and this spring at the upper end is engaged bv a slidable piston block 22 arranged in the upper end of the chamber 19.

rIhe piston block 22 is threaded axially and in this is adjustably secured a threaded member 23 which is preferably provided at its upper end with a roller contact 24. The roller contact is engaged by a suitable means for pressing the piston block inwardly7 against the compression spring 21 and the means here shown is in the form of a cam 25 mounted upon a pin 26 arranged in fixed relation to the body 10. This cam is operated in a suitable manner, either by a hand lever 27 or it may be controlled by a ratchet mechanism. connected with the press. A ratchet device is here shown in the form of a wheel 2S having ratchet teeth 29 which are enH gaged by a ratchet dog 30 carried on the lever 31 which is liivotally mounted on the pin 26.

The plunger cylinder 1l. .is provided with an opening 32 in the side wall intermediate of its length which is connected with the pressure iiuidsupply leading to the press from the discharge chamber of the main valve so that the pressure fluid will enter the cylinder 11 and will operate against the piston to force the plunger upwardlyv against the pressure of the spring 21. This action lifts the operating valve plunger 8 and allows the closing of the valve 3 controlling the pressure supply and opens the exhaust from the chamber 5 through the plunger 6. This action releases the pressure -in the cylinder 11 against the piston 17 and upon the pressure being thus released the spring 2l reacts and pushes the plunger lll) downward again opening the mainvalve 3. This action will continue indefinitely as long as the piston block 22 is held depressed by the cam 25 to create a pressure on the piston 17 through the spring 21, but when this cam is turned back, thefpressure `exerted by the cam on the member 23 through the spring 21 is released and the operating plunger Sis then lifted from its seat opening the exhaust.

The up fard movement of the operating plunger 8 allows the valve 3 toclo'se' therebyV block 22 is depressed and through the spring- 21 the plunger rod 14 isoperated to move the operating valve plunger of the main valve inwardly. This plunger in turn engages the hollow plunger 6 which moves into contact with the valve stem 4 Vand -moving the valve 3 olf its seatfthe fluid pressure is allowed to flow to the press.

Goncurrently in flowing to the press this pressure flows through the pipe 33 to thel 1 cylinder 11 and entering below the cup piston the pressure forces Vthe plunger rod'14 outwardly compressing the spring2l'.` The outward' movement of' the plunger 14 also lifts the operating valve plunger from its seat and in so doing allows the pressure valve 3 vto close cuttinglolf the-supply of operating pressure fluid from the press and allowing the exhaust therefrom to pass back through the gexl'i'austpassagesof the" main valve and ofcourse Vreleases the pressure against the piston of the plunger rod 14. rEhe spring-2l immediately reacts and pushes the plunger rod 14 -inwardly again opening the main valve 3 and the operation is repeated.

This alternating checking and releasing of the pressure to the press creates a hammering or vibratory effect which is extremely desirable for certain classes of' work and as long c.s the valve 3 is acted upon by the pres'- sure applied through the spring-21 the vibratory action will continue.

The lever 31 may be suitably connected with the ram of the press so as to move upV and down with theV action of the ram and the ratchet arrangement described will operate to gradually turn the cam to its position of release.y

With such a device the ratchet action may be setto regulate the number of strokes or vibrations of the" press at each operation by simply turning the cam member 25 the desired distance.

The ratchet mechanism herein shown is very simple or it'inaybe replaced by other mechanism which will gradually releaserthe downwardV pressure oirtlie spring 21.

A device such as described is extremely simple, it can be'regulated lto suit any desirable'condition of pressure and speed and will greatly enhance Vthe operative l'f'unctions of a hydraulic press.

The pressure of the fluid supply to the Vpress may be regulated very accurately and quickly .by theV adjustment ofthe member carrying the roller 23 in the piston block-22 which thus regulates the pressure of the spring 21 and consequentlyregulates the 1 movement of the main valve 3 from its seat What I claim as my `inventioii isfl. In a` hydraulic valve, apressure fluid control valve, a plunger4 for operatinglsaid valve, a resilient plunger operatively engaging said valve operating plunger, and hydraulic means 'for opera-tingusaidv resilient plunger. V

2. In a hydraulic valve, a pressure fluid control valve having an operating plunger, a

plunger operatively 'connected with the aforesaidplunger, a cylinder enclosingsaid latter plunger, means for conducting pres- Y sure fluid to said cylinder to operate the plunger therein in o-ne direction,` and-"re silient means opposing the operation of'said latter plunger.

leu

3.v In a hydraulic-valve, ay pressure fluid control valve havingan operating plunger,` a plunger operatively connectedwith the aforesaid plunger, a cylinder enclosing said latter plunger, means for. conducting pres? sure liuidto said cylinder to operatethe plunger therein inione direction, and'adjust-k able resilient means' opposing the"operatioriv v Y Y 11o 4. In a hydraulic valve, av pressure fluid of said latter plunger.

control valve having an'op'erating plunger,Y a plunger' operatively' coiiii'ectedl` with' the44 aforesaid plunger, a cylinder enclosingisaid latter plunger, means for coiiductingpressure fluid to said cylinder tooperate the plunger therein in one direction, resilient" means opposing the operation' of said plun'gl` er, andmeans adapted to increasel or decrease the resistance of "said resilient means totheaction of the said 'latter plunger.

5. In a hydraulic valve, a pressure fluid control'v valve having an operatingpli'inger, a plunger operatively connectedfwi'th the aforesaid plunger, a cylinder enclosing said latter plunger, means for conducting pressure fluid to said cylinder to operatethe plunger thereinv in one direction, resilient means opposing the operation of said'latt'er plunger, a slidable member engaging said resilient means', and means for operating said slidable member to regulate the resistance of said slidable member to the hydraulic movement of said latter plunger.

6. In a hydraulic valve, a pressure fluid control valve having an operating plunger, a plunger operatively connected With the aforesaid plunger, a cylinder enclosing said latter plunger, means for conducting pressure fluid to said cylinder to operate the plunger therein in one direction, a spiral compression spring engaging said hydraulic plunger, and an adjustable member engaging the outer end of said spring.

7. In a hydraulic valve, a pressure fluid control valve having an operating plunger, a plunger operatively connected With the aforesaid plunger, a cylinder enclosing said latter plunger, means for conducting pressure fluid tosaid cylinder to operate the plunger therein in one direction, a spiral compression spring engaging said hydraulic plunger, an adjustable member engaging the outer end of said spring, and a cam engaging said adjustable member.

8. In a hydraulic valve, a. pressure fluid control valve having a plunger, a plunger operatively connected with the aforesaid plunger, a cylinder enclosing said latter plunger, means for conduct-ing pressure fluid to said cylinder to operate the plunger therein in one direction, a spiral compression spring engaging said hydraulic plunger, an adjustable member engaging the outer end of said spring, means for operating said adjustable member, and means actuated by the press for automatically moving said operating means to gradually reduce the resistance of the spring to the hydraulic movement of said hydraulic plunger.

9. In a hydraulic valve, a pressure fluid control valve having an operating plunger, a plunger operatively connected with said main valve, a cylinder enclosing said latter plunger, means for conducting pressure fluid to said cylinder to operate the plunger therein in one direction, resilient means opposing the operation of said plunger, and means for regulating the flow of the pressure fluid to said cylinder.

10. In a valve for hydraulic presses, a pressure fluid control valve having an operating plunger and discharge and eX- haust chambers connected With the press, a conduit leading from the discharge chamber, a cylinder connected With said conduit, a piston operating in said cylinder, a plunger connected With said piston and operatively connected with said operating plunger, and resilient means engaging said plunger piston to operate it to open the main valve.

l1. In a valve for hydraulic presses, a pressure fluid co-ntrol valve having an operating plunger and discharge and exhaust chambers connected With the press, a conduit leading from the discharge chamber, a cylinder connected With said conduit, a piston operating in said cylinder, a plunger connected with said piston and with said operating plunger, resilient means engaging said plunger piston to operate it to open the main valve, and a stop valve arranged in said conduit to regulate the flow of the pressure fluid to the plunger cylinder.

12. In a valve for hydraulic presses, a fluid pressure control valve having a reciprocating operating plunger, a cylinder arranged in alignment with said operating plunger, a piston operating in said cylinder and connected With said plunger, a cylindrical chamber in alignment with said cylinder, a coil compression spring arranged Within said chamber and engaging the pis ton of said plunger, a piston block slidably arranged in the outer end of said cylindrical chamber and engaging said spring, a member threaded in said piston block, and means` engaging said threaded member for operating said piston block in said chamber.

THOMAS B. JONES.