US2554266A - Pressure actuated switch - Google Patents

Description

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May 22, 1951 Patented May 22, 1951 UNITED STATES; PATENT OFFICE,

PRESSURE ACTUATED SWITCH Jacob L..Pauly, Hasbrouck Heights, N. J., assignor to Bendixl Aviation Corporation, Teterboro, N. .1., a corporation of Delaware Application December 2, 1948, Serial No. 63,060

3.Cla-ims.A (Cl. 200-83) vide: a; sensitivefpressure actuated switch. operable on pressures between. 6 inches: of' water 4pressure and 25 pounds persquare inch encountered in oxygen demand. regulators.

A further object of myinventionis to pro videv a pressure actuated. switch' of Vthe. `character indicated in which: thel pressure of the luidifa'cts' against a diaphragm .and calibratedspring; and?v in which no' back: pressure.: is built up 'by'v the movement of the diaphragm.

Another object of thisfinventionis=t01f provide' a pressurev actuatedV switch of thecharacterz'irrdi'- cated in which the friction of moving parts is reduced to'a minimum duetto thelarge bearing surfaces providedtherein.

Stilllanother `obi ect oi i my inventionxis to. provide a. pressure actuated.. switchfoifthe cha-rac ter indicated in which theidiaphragin actediuponv by the fluid. pressure in turn acts upon a piston surface having approximately the same area as the diaphragm to insurepositive action of the switch in response to duid pressures.;

Still a further object of the invention is to*v provide a pressure actuated. switch. of. the character described in whichv the response of the switchftooperating pressures may be varied Yet another objectief my invention istofprovidefa pressure actuated. switch which shall. consistA of few` and simple parts; relatively inex pensive to manufacture, .automa-tic'. and positive in its operation, which shall` havefa-largevariety of application and VYyet be practical andefiicient to ahigh degree inv use.

Other objects of the invention will in` part'be obvious, and in part vhereinafter. pointed out.

The invention accordingly consists in the features of construction, combinations.. of'.`e1e' ments'andV arrangem'entof parts which Willbe exemplified in the construction hereinafter described and of which the scope of application will be indicated in the appended claims.

In the accompanying drawing forming a part of this specification in which one of the various illustrative embodiments of my invention is shown as a longitudinal cross-sectional View with portions shown in elevation, the numeral II] designates a pressure actuated switch enclosed in a housing II which is iixed to a mounting ange I2 as by screws I3.

The mounting flange I2 is provided with a threadedstud: I4 and formed with anopening or. port I5 through whiohthe'iiuid pressurexis The. housing.

introduced .into the' housing Il: II iszprovided with an integral ange Ixat the base thereof, said flange being formed.. with dependent annular.` member.V I'I. the housing I I to they mountingY ilange. I2? the dependent member I'I forms. a cham'berf29fbe-- tween the ange andthe housing. A' resilient diaphragm ZI is fastened between the mount-v ing flange I2A and the dependent member 'I'I' byV the screws I3. the diaphragm.' 2l being.r thus adapted to be expanded". to the dottedflineiposi tion shown upon an increase inpressure through.

the port I5;

Fixed withinthe housing.' I I andflongitudinally disposed therein is a sleeve 2E formed with.:elonr gated slots' 26; for'the; purposes; hereinafter appearing. The upper end'of thefsleevezi-25fispr vided with a threaded. portion. 2,..an; adjustment nut 219 being threaded: thereon.

Slidably received within the sleeve 2.5i is a piston 3B, the upper end' 3l ofthev piston. ex-

tending slightly; above the upper end.Y of.' they sleeve 25. Fixed to the lower end of the piston 30 assby screw 33 is arigid abutment plate 35,

said-abutment `plate being within the diaphragmv chamber 20. Fixed to the upper end 3I of the piston is an abutment pin 38. The movement of the piston 3] within the sleeve 251s limited by apin 40 passing through said piston and registering in the slots 25 of the sleeve. Two

spring retainers il and 42 are provided` aboutv the sleeve 25, the one abutting the nut 29', thel other abutting the pin 4G. A. coil compression spring 43 woundv about the sleeve 25 and interposed between the two retainers 4| and 42 tends to urge the piston 30 and its abutment plate' 35 in a downward direction against the diaphragm 2i.

The increasing pressure acting upon the dia*- phragm 2l through the portiI5l will tend toraise the diaphragm 2l. rThe diaphragm will press against the abutment plate 35 to move the piston 3| against the action of the spring 43. It will be appreciated that the area of the abutment plate 35 is approximately that of the diaphragm 2| so that any pressure of the fluid acting upon the diaphragm is transmitted directly to the piston 30.

The movement of the abutment plate 35 within the chamber 20 will compress any air entrapped above the abutment plate 35. The compression of this entrapped air would tend to oiTer a greater resistance to the movement of the piston In fastening` 30. To offset the cushioning effect of the entrapped, air ports 45 are provided in the bottom wall of the housing l l interconnecting the chamber with the interior of the housing. Any air now that is behind the abutment plate will be forced through the ports into the interior of the casing Il, the larger volume of the casing l preventing any cushioning effect as previously described.

Fixed across the top of the housing Il as by screws 48 is a mounting plate 49. Fixed to the underside of the plate 49 is a contact assembly 50 comprising an insulating plate 5l, a stationary contact 52 and a U-shaped leaf spring 53 carrying at its free end a contact 54. An electrical coupling 56 is mounted to the top of plate 49 for connecting the contacts 52 and 54 to an external electrical circuit (not shown) whereby a signal or alarm may be given upon engagement of the two contacts.

The upward movement of the piston 36 due to the expansion of the diaphragm 2l will carry the abutment pin 38 upwardly to engage the outer end of the leaf spring 53. The leaf spring will be compressed so that the moveable contact 54 will be brought into engagement with the xed contact 52. A fall in pressure within the chamber 2l) will permit the spring 43 to return the piston 30 to its neutral or normal position permitting the contacts 52 and 54 to disengage thereby breaking the electrical circuit.

It will be apparent that the position of the nut 29 on the sleeve 25 will determine the bias of the spring 42. Thus the pressure at which the contacts 52 and 54 will engage can be regulated by screwing the nut 29 into various positions along the sleeve.

It will thus be seen that there is provided a pressure actuated switch in which the several objects of this invention are achieved and which is well adapted to meet the conditions of practical use.

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

l. A pressure actuated switch comprising a housing, a mounting for said housing, said housing and said mounting forming a chamber therebetween, a diaphragm within said chamber, a port in said mounting adapted to be connected to a fluid pressure source and registering with said chamber, a sleeve longitudinally disposed in said housing and provided with elongated slots therein, a piston within said sleeve, abutment means xed to said piston and protruding through said slots, means adjustably iixed externally to said sleeve in spaced relation to said slots, a plate disposed in said chamber adjacent said diaphragm and aixed to one end of said piston, biasing means interposed between said abutment means and said adjustable means and disposed externally of said sleeve for biasing said plate into engagement with said diaphragm, and a switch adapted to be actuated by the other end of said piston upon movement thereof by said diaphragm.

2. A pressure actuated switch comprising a housing, a mounting for said housing, said housing and said mounting forming a chamber therebetween, a diaphragm within said chamber, a port in said mounting adapted to be connected to a fluid pressure source and registering with said chamber, a sleeve longitudinally disposed in said housing and provided with elongated slots therein, means adjustably xed externally to said sleeve adjacent one end thereof, a piston within said sleeve, a pin aixed to said piston and protruding through said slots, a plate disposed in said chamber adjacent said diaphragm and afxed to the one end of said piston remote from said one end of said sleeve, means externally of said sleeve interposed between said pin and said adjustable means for biasing said plate into engagement with said diaphragm, and a switch adapted to be actuated by the other end of said piston upon movement thereof by said diaphragm.

3. A pressure actuated switch comprising a housing having a chamber formed therein, a mounting secured to said housing so as to form a second chamber therebetween, a diaphragm secured between said housing and said mounting within said second chamber, a port in said mounting adapted to be connected to a iiuid pressure source and registering with said second chamber, a sleeve longitudinally disposed in said housing, a piston within said sleeve, a plate secured to said piston movable therewith within said second chamber and adapted to be engaged by said diaphragm, a plurality of cushioning eliminating ports interconnecting the two mentioned chambers so that actuation of said plate by said diaphragm provides negligible resistance to the displacement of said plate, and a switch adapted to be actuated by the other end of said piston upon movement thereof by said diaphragm.

JACOB L. PAULY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 956,679 Champ et al May 3, 1910 1,033,900 Janette July 30, 1912 1,340,646 Anderson May 18, 1920 1,710,859 Burks Apr. 30, 1929 2,136,504 Hilbert et al Nov. 15, 19318 2,343,245 Satterlee Mar. 7, 1944 2,393,455 Beeman Jan. 22, 1946 2,422,342 Dillman June 17, 1947 FOREIGN PATENTS Number Country Date 656,557 France May 27, 1930

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