US1479733A - Pressure-regulating means for electrically-operated apparatus - Google Patents

Description

Jan. 1; 1924 M. J. QUINN PRESSURE REGULATING MEANS FOR ELECTRICALLY OPERATED APPARATUS Filed NOV. 20, 1920 Patented Jan. 1, 1924-.

UNITED STATES MARTIN J'OSEPH QUINN, OF TORONTO, ONTARIO, CANADA.

PRESSURE-REGULATING MEANS FOR'ELECTRICALLY-OPERATED APPARATUS.

Application filed November 20, 1920. Serial No. 425,542.

To all whom it may concern Be it known that I, MARTIN JOSEPH QUINN, of the city-of Toronto, in the county of York and Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Pressure-Regulating Means for Electrically-Operated Apparatus; and I hereby declare the following to be a full, clear, and exact description of the same. j

This invention relates to a pressure-regulating means for electrically operated .pumping and other apparatus in which'the fluid agent is subject to variations of pressure, the object of the invention being to sensitively and positively control the circuit of the current as the pressure of the fluid agent rises or falls to predetermined limits,

this object being'attained .by a peculiarly constructed pressure actuated motor which respectively opens andcloses the switch controlling the circuit of the current, when the pressure of the fluid agent-rises or falls to that for which the motor is set.

foregoing object may be attained, with the parts in their low pressure position, and

Fig. 2, is a similar'view taken at'right angles to Fig. 1, with the parts in their high pressure position.

Like characters of reference refer to like parts throughout the specification and draw- 'ings.

In carryingout the invention the pressure regulating apparatus must positively and sensitively act and react during the changes of pressure of the fluid agent, and it is therefore necessary that its motive partsshould be so constructed as to enable it to correctly perform these functions.

In the preferred typeof apparatus is a pressure actuated motor, consisting of a cylindrical walla, having an internal anin position.

or pipe 6 with which thenipple c isconnected, and surrounding the pressure chamber is a ledge 0.

Overlying the pressure chamber 0'. is an elastic diaphragm f of corresponding diameter to the inner'diameter of the cap 0.

The end 5 of they enlargement b is opposed to the ledge 0 and in conjunction with the cap 0 securelyholds the diaphragm The diaphragm is preferably made of pure rubber and of a' thickness suitable to the pressure of the fluid agent.

'Axially movable in the housing of the motor is a piston g of corresponding crosssectional shape and dimens ons to the bore of theenlargement bjand near the upper end of the pistonis a surrounding flange g which, when the piston is in its low pressure position, engages the shoulder b at theother end of the enlargement, and arrests the movement of'the piston towards the diaphragm. I I

The length of the piston from the flange gto the piston head is slightly less than that of the enlargement b sothat when the flange g is seated on the shoulder 12, the piston head Z) will not be in contact under pressure with the diaphragm f until the latter is'distended by'the pressure of the fluid agent. The piston head 6 is of a concave shape and the edge 6 is slightly rounded to avoid the cutting of the diaphragm when in contact therewith.

' Centrally formed through the cap d is a screw-threaded bore d, and adjustable through thebore cl is an externally screwthreaded hollow plug it for regulating the pressure at which the motor will operate, the head it of the plug being preferably hexagonal. Fitted to the pistonis'one end of a piston rod 2' which extends axially through the bore of the plug and beyond the head h. Encircling the piston rodc' is a washer z" and bearing against the washer z" and the piston is a coiled'spring j, normally pressing the piston 9 towards the diaphragm, and resisting its movement therefrom.

In the operation of the apparatus thusfar described, the fluid agent, entering the pressure chamber, against the piston head b and moves the piston in the direction indicated by arrow in the drawings until the piston has reached the limitofits high pressure position, the piston throughout its travel covering the whole active area of the diaphragm.

distends the diaphragm When the pressure of the fluid agent falls the piston'moves back to its low pressure position under the influence of the spring and closes the circuit.

The diaphragm,- being made of elastic While this pressure actuated'motor may be used toopen and close any standard or approved-type of'switch it is in the present case especially adapted for use in connection with a switch is, havingtwo' plungers 70, k, which respectively open and close the circuit formed by the conductors 7& Z0.

To actuate-a switch of this type the piston rod is provided with operating means, shown in the present case to consist of a yokel connected with the piston rod and encircling the switch 7c, and plungers 70, ]c"'.

During the outward movement of the piston rod 2' with the piston g, the yoke engages the plunger lcand moves it toopen the circuit through the switch is, and this movement of the plunger is" positlons the plunger 70 to be engaged by the yoke on the return stroke to again close. the circuit.

A switch support preferably consisting of an outwardly extending arm on is bolted to the'cap d, and to thisarm is fixedly attached the switch is. As the type of switch will depend to a large extent on the system with'which the pressure regulating ap: paratus is used 1t may benecessary to vary the structural arrangement of the support an and the switch operating means, and adapt them to the particulartype of switch employed. 7

Having thus fully, described my invention, what .I claim as new and desire to secure by LettersPatent is: v

1. In a pressureregulat ng apparatus for electrically operated systems,a pressure actuated motor comprising 'a' housing, a movable piston therein, a piston rod for the piston, a pressure spring normally resisting the movement of the piston and piston rod,

a pressure chamber opposed to the piston, an elastic diaphragm whose free movement is restrictedonly by the movement of the piston, interposedbetween the piston and pressure chamber, with the whole of its active surface in contact with the piston throughout its travel and out of contact with it when not distended.

2. A pressure regulating apparatus comprising a housing, a movable plston therein,

a pressure chamber opposed to the piston,

active surface in contact. with the piston throughout its travel and out of contact with it when not distended, a pressure spring resisting the movement ofthe piston, and an abutment within the housing arresting the movement otthe piston towards thediaphragm and maintaining it out of contact with it until the diaphragm is distended. I

4;. A pressure regulating apparatus comprising a housing, movable piston therein, a pressure chamber opposed to the piston, and an elastic diaphragm, whose movement is restricted only by themovement of the piston, interposed between the piston and pressure chamber, with tlie whole tr its active surface in contact with the piston throughout its travel andout of contact with it when, not distended,v the surface or the piston opposed to the diaphragm being concave.

5. prising a housing consisting of a cylindrical wall having an internal annular'enlarge ment extending to one end thereof, caps =fitted on the ends of said wall one of which .is opposed to said enlargement, an elastic diaphragm interposed between the'end of the enlargement and the corresponding cap, and a piston axially movable in thehousing of corresponding cross-sectional shape and dimensions to the bore of the enlargement having near its upper end a surrounding flange which when the piston is in its low pressure position, engagesthe inner end of the enlargement and arrests the: movement of the piston towards the diaphragm, said piston overlying the whole active area of the diaphragm with which it contacts dur ing the whole of its movement.

6. A pressure regulating. apparatus comprising a housing consistingof a cylindrical wall having an internal annular enlargement extending to one end thereot,,caps fitted on the ends of said wall one of which is opposed to said enlargement, an 'elastic 'diaphragm interposed between the end of the enIar 'ement .an dthe corresponding cap, and a p1ston axlally movable in the housing,

A ressure remnan s aratus comof corresponding cross-sectional shape and dimensions to the bore of the enlargement having near its upper end a surrounding flange which, when the piston is in its low pressure position, engages the inner end of the enlargement and arrests the movement 01. the piston towards the diaphragm, said piston overlying the whole active area of the diaphragm with which it contacts during the whole of its movement, the piston being slightly less in length than the enlargement so that when the diaphragm is not distended under pressure, it will be out of contact with the piston.

7 A pressure regulating apparatus comprising a housing consisting of a cylindrical wall having an internal annular enlargement extending to one end thereof, caps fitted on the ends of said Wall one of which is opposed to said enlargement, an elastic diaphragm interposed between the end of the enlargement and the corresponding cap, a piston axially movable in the housing, of corresponding cross-sectional shape and dimensions to the bore of the enlargement having near its upper end a surrounding flange which when the piston is in its low pressure position, engages the inner end of the enlargement and arrests the movement of the piston towards the diaphragm, said piston overlying the whole active area of the diaphragm with which it contacts during the whole of its movement, a piston-rod for the piston extending axially through said housing and a yoke at the outer end of the piston-rod.

Toronto, Ontario, November 16th, 1920.

MARTIN JOSEPH QUINN.

Signed in the presence of CHAS. H. RICHES, I. E. SHERRIFF.

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