US3542074A

US3542074A - Fluid responsive control valve

Info

Publication number: US3542074A
Application number: US764440A
Authority: US
Inventors: Willy Gassert
Original assignee: Individual
Current assignee: Individual
Priority date: 1967-10-04
Filing date: 1968-10-02
Publication date: 1970-11-24
Anticipated expiration: 1987-11-24
Also published as: DE1800520A1; CH458860A; AT290937B

Description

United States Patent Willy Gasaert 59 iieuptasse, Solothurn, Switzerland [2!] Appl. No. 764,440

[ 72] inventor [22] Filed Oct. 2, 1968 [45] Patented Nov. 24, 1970 [32] Priority Oct. 4, 1967 [33] Switzerland [54] FLUID RESPONSIVE CONTROL VALVE 9 Claims, 4 Drawing Figs. v t

[52] US. Cl 137/625. [51] Int. Fl6lt 11/07 [50] Field of Search ..137/624.27,

. 56] References Cited UNIT ED STATES PATENTS 2,736,297 2/1956 MacDonald l37/624.27X

2,957,457 10/1960 Rabjohn Primary Examiner-Henry T. Klinksiek Attorney-Waters, Roditi, Schwartz & Nissen ABSTRACT: A multiway control valve for controlling the oscillatory movement of the piston of a hydraulically or pneumatically actuated oscillator in such manner that the period of oscillation of the piston movement-of the oscillator is independent of the velocity of the piston. The control valve comprises a valve housing and a fluid actuated control piston arranged for reciprocating movement in the housing. A longitudinally extending recess is provided at each end of the control piston,

and two springs are mounted one at each end of the piston. In-

the unstressed state, the springs press against the edge of the respective recess in the control piston to restrain the movement of the piston until the force acting on one end'of the piston exceeds the spring force, at which time the relevant spring is then laterally compressed and slides into the recess of the piston so as not to restrain the piston.

P atented' Nov. 24, 1970 3,542,074

Sheet 1 of 2 Fig.7

1 T" 11 L6 11 T10 11 Patented Nov. 24, 1970 3,542,074

Sheet 2 of2 Fig. 3

7 9 6 70 I I l .15 3. F/31017 lPosi/ion Fig. 4

a l/ WWW FLUID RESPONSIVE CONTROL VALVE This invention relatesto a multiway control valve for a pneumatically or hydraulically actuated oseillator ,'suchval ve comprising a valve housing and a control piston which is movable for reciprocation'in the housing.

For certain purposesit may be necessary to control the oscillatory movement of the piston of a pneumatically or hydraulically actuated single-acting or double-acting cylinder in such a manner that the period of oscillation of the piston is independent of thevelocity of the piston. By means of such ends thereof in communication with

ports

7 and 8 respectively of the control valve 1 by way of pipes 7' and 8'. Port 6 forms the compressed air inlet, while ports 9 and act as compressed air outlets. The two

outlet ports

9 and 10 may be procontrol the-duration of the piston movement in the one.-

direction may be controlled to be longer than in the other direction,.or it may be controlled to be the same in both directions. In order "to provide such control, several multiway control valves havebeen used in combination heretofore, although such arrangements are comparatively complex and demand much space. n

It is therefore an objectof the present invention to provide a multiway control valve by means of which'a control of the kind mentioned above can be exercised. v v

In accordance withthe present invention, there is provided a multiway control valve for a pneumatically or hydraulically actuated oscillator which comprises a valve housing, a control piston arranged for reciprocation in the housing, andmeans arranged to automatically impose a restrain on the movement of the control piston in both its directions of movement.

vided with throttlingmeans by which the exit velocity of the compressedair therefrom can be regulated. The pipes 7' and 3 arealso in communication with the pipe connecters 14a and 14b respectively by way of

throttling valves

23 and 24 connected into the pipelines 21 and 22 respectively. With the control piston 5 in this position the compressed air entering through port 6 flows through the control chamber 12, through port 7, and through pipe 7 and enters the cylinder 19 at the port 7' thereof, with the result that the. piston 20 in the cylinder'l9 is displacedto the right in the direction shown by the arrow until it strikes the end 25 of the cylinder 19. At the same time the piston 20 forces the air present in the cylinder 19 out of the cylinder through its other port 8", pipe 8', valve port 8, and valve outlet port l0. When the piston 20 reaches the end 25 of the cylinder 19, the compressed air then flows from the pipe 7' through the throttling valve23, pipe 21, and

the pipe connecter 164 back into the, control chamber 12 .where it exerts a'iforce on the control piston 5. The. control piston 5 is held in its left-hand end position by means of the spring 18b; which has its open end arms pressing against the edgeof the recess 13b in the piston 5, until a pressure is ex erted-on the other end' of the piston which is sufficient to over- In order thatthe invention may be fully understood, em-

bodiments in accordance therewith will now be described by way of example and with reference to the accompanying drawings,'in which:

FlG. l is a sectional view accordance with the invention;

' FIG. 2 is a flow diagram for the actuation of an oscillator constructed as adouble-acting cylinder;

f FIG. 3 is a flow diagram for'the" actuation of an oscillator constructed as a single-acting cylinder; and e v FIG. 4 shows a collet spring as well as a pipe connecter formed with ahosegrip. I e j I e e The five-way control valve 1 shown in FIG. 1 comprises a housing 2 closed at'both ends by respective end plates land 4. A pneumatically or hydraulically actuated control piston 5 is mounted within a cylindrical control chamber 12 in' the'housthrough a five 'way control valve in ing 2. There are five

connection ports

6,7,8,9. and'10 formed" through. the longitudinal wall of the housing 2, three of the come the force of the spring 18b. If the pressure force becomes greater than the force ex'erted by the spring 18b then the spring is laterally compressed and slides into the recess 13b in the piston, so thatth'e restraint on the control piston 5 is removed andit is displaced impulsively to the right. When the piston 5 reaches its right-hand terminal position the spring 18a, which until now has been in its-compressed state in the recess 13a of the'piston, emerges from the recess, becomes unstressed, presses-its arms against the edge of'the recess 13a,

and thus provides a' rc'straintagainst the piston moving back to the left; The compressed air entering through port 6 now flows through port 8, pipe 8,, and cylinder port 8" into the cylinder '19 and displaces the piston 20 in the opposite direction, i.e. to

" t Y the left as shownin ElG. 2. After this movement of the piston by the spring 18a-is overcome and the piston 5 is displaced control piston 5 has a recess 13a and-13b at each end thereof and moves back and forth in the control chamber 12 between its terminal rest positions whenit abuts the end plates 3 and 4 respectively. In order to supply to the valve a pressurized medium for actuating the control piston 5, a pipe connecter 14a, 14b is screwed into each of the end plates 3 and}. Each of these pipe connecters 14z'1 and 14b isdesigned to be coupled to theend of a pipe or hos'eand is provided with aretain- 20 has finished, pressure builds up at thepipe connecter 16b of the valve 1 until the restr'aint'exerted on the control piston 5 back towards its left-hand end position. The period of oscillation of theipiston 20 can be regulated by means of the two

throttling valves

23 and 24. These can be so adjusted that the duration of the movement of the piston 20 in each of the two directions is either the same or is longer in one direction than intheother. 1 r

As is evident from FIG. 3 a single-acting cylinder 26 can be used as the oscillatorinstead of the double-acting piston and cylinder shown in FIG. 2. In the embodiment shown in FIG.:3

. the piston 27 of the'oscillator 26 moves against the action of a ing nut 15a, 15b which can be screwed down to finedlyela'rnp the associated pipe or hoseon to the tapered

outer end portion

16a, 16b of the connecter. The pipe connecters 14a and spring 28. When the control piston S of the control valve 1 is located in its right-hand end position the compressed air flows through port 6'into the control chamber 12 and out of the "chamber through poi-t8 and pipe 8', entering the cylinder 26 v, at the right-hand port 8 andforcing the piston 27 to the left,

with the result that the spring 28 is compressed. When the piston '27 reaches its left-hand end position pressure builds up 14b. have 'bores. 17a and 175' respectively formed thcrethrough, andin these b'ores are providedrespective collet springs 18aand'18b, whose laterally compressible open,

ends project into thecontrol chamber 12. These springs are so arranged and formed'as to cause an automatic check or restraint to be imposed onthe movement of the control piston I 5 in both of its directions of movement.

at the pipe connecter 16b of the control piston 5 by flow through the pipe 8', throttling valve 28, and pipe 29, until the restraint on the control piston 5 due to the spring 18a is 'over-' come and the piston is displaced to the left into its other end position. The piston 27 of the oscillator is thereby relieved of its loading and the spring 28 returns the piston 27 to its righthand end position. The compressed air now flows'throughport The manner of operation of the control valve 1 will now be I explained with reference to the compressed air flow diagrams shown in FIGS.) and 3. In FIG. 2, a double-acting cylinder 19 serves as an oscillator associated with'the valve 1. The control piston 5 of the control valve 1 is located in its one terminal positionin which it rests against the left-hand end plate 3 as shown in FIG. 1. The oscillator 19 has ports 7" 8" at opposite 7, pipe 30,, and throttling valve 31 to the pipe connecter l6a1of the control piston 5 until the restrainton the movement of the piston in the "opposite direction due to the spring 18b is removed and the control jpiston 5 is again displaced into its right-hand end position. Then begins a new working cycle. In this embodiment also the period of oscillation of the piston 27 can be regulated by means of the throttling

valves

28 and 31.

Control of the oscillatory movement of the

piston

20 or 27 can be effected in both embodiments without throttling valves, in which case the strength of the springs 18a and 18b is chosen so that the force exerted by the springs is overcome at a predetermined pressure.

FIG. 4 shows a hose grip 32 having a circumferentially ridged peripheral surface which may be usedinstead of the pipe connecters 14b and 14b. This FIG. also shows a collet spring 18 which is inserted in the bore 33 of the hose grip and is fixedly held therein, and which exercises the check or restraint on the movement of the control piston of the valve 1.

The control valve 1 described herein can also be used for hydraulic control functions, in which case the actuation of the control piston 5 is likewise carried out hydraulically. In this case a pressure reservoir must be provided in each of the pipe lines leading to the pipe connecters 14 a and 14b in order to balance out any pressure surges.

lclaim:

1. A fluid responsive control valve comprising a housing including opposite endswalls, said housing being provided with a longitudinal channel, a piston including opposite end portions slidably supported in said channel for movement between said opposite end walls, an inlet port provided in said housing in communication with said channel, in outlet port provided in said housing in communication with said channel, a return port provided in said housing in communication with said channel, a pair of resilient members supported in said housing and extending in said channel, each of said resilient members including a secured portion and a restraining portion for engagement one with each of said opposite end portions of said piston, said resilient means acting to restrain the longitudinal movement of said piston in said channel toward a respective one of said opposite end walls, said restraining portion of each of said resilient members being deformable laterally of said channel, said restraining portion upon being laterally deformed beyond a prescribed magnitude acting to substantially free said piston from longitudinal restraint, and means for receiving the laterally deformed restraining portion of each of said resilient members after the restraining portion has been laterally deformed beyond said prescribed magnitude so that said piston may be moved beyond thelaterally deformed restraining portion to continue toward a respective one of said opposite end walls.

2. A control valve as claimed in claim 1, wherein said piston is provided with a longitudinally disposed recess at each of said end portions thereof, each constituting said means for receiving a respective laterally deformed restraining portion of each of said resilient members.

3. A control valve as claimed in claim 2, wherein said restraining portion of each of said resilient members includes a pair of laterally deformable arms stemming from said secured portion which is substantially loop-shaped.

4. A control valve as claimed in claim 3, including a further return port provided in said housing in communication with said channel, said return port and said further return port being provided one in each of said opposite end walls and longitudinally opposite each of said opposite end portions of said piston.

5. A control valve as claimed in claim 4, wherein said pair of resilient members are each supported to extend from said return port and said further return port respectively into said channel, and including connccter means in communication with said return port and said further return port for supporting said resilient members.

6. A control valve as claimed in claim 5, wherein said connecter means includes a coupling means for coupling said connecter to an external source.

7. A control valve as claimed in claim 6, wherein said external source includes a further housing provided with a further channel, a further piston slidably supported in said further channel, first means constituting an inlet and outlet port provided in said further housing in communication with said further channel, first conduit means couplin said outlet port and said return port of said housing with sai means constituting an inlet and outlet port of said further housing, and throttling means included in said first conduit means for controlling a flowing medium to said return port.

8. A control valve as claimed in claim 7, wherein said further housing includes second means constituting an inlet and outlet port in communication with said further channel, said housing including a further outlet port in communication with said channel, second conduit means coupling said further outlet port and said further return port of said housing with saidsecond means constituting an inlet and outlet port of said further housing, and throttling means included in said second conduit means for controlling a flowing medium to said further return port.

9. A control valve as claimed in claim 7, including a spring supported in said further channel for biasing said further piston in one direction in said further channel.