US3585321A - Pneumatic time delay switch with improved auxiliary manual switch actuator means - Google Patents

Pneumatic time delay switch with improved auxiliary manual switch actuator means Download PDF

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Publication number
US3585321A
US3585321A US827363A US3585321DA US3585321A US 3585321 A US3585321 A US 3585321A US 827363 A US827363 A US 827363A US 3585321D A US3585321D A US 3585321DA US 3585321 A US3585321 A US 3585321A
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United States
Prior art keywords
actuator
bellows
switch
air
movable contacts
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Expired - Lifetime
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US827363A
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English (en)
Inventor
John J Dennison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cooper Industries LLC
Arrow Hart Inc
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Arrow Hart Inc
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Publication of US3585321A publication Critical patent/US3585321A/en
Assigned to COOPER INDUSTRIES, INC, A CORP.OF OHIO reassignment COOPER INDUSTRIES, INC, A CORP.OF OHIO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CROUSE-HINDS COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/24—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a non-rotatable moving part
    • H01H43/28—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a non-rotatable moving part the actuation being produced by a part, the speed of which is controlled by fluid-pressure means, e.g. by piston and cylinder
    • H01H43/285—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a non-rotatable moving part the actuation being produced by a part, the speed of which is controlled by fluid-pressure means, e.g. by piston and cylinder adjusting the time interval by means of an adjustable orifice, e.g. needle valve

Definitions

  • An electrical switch includes a pneumatic time delay mechanism to provide a delay between release of the actuator and return of the contacts to their initial condition.
  • a pivoted lever member associated with the actuator energizes the pneumatic mechanism and initiates the delay function upon release of the actuator.
  • the present invention is concerned with a switch which pneumatically provides an adjustable delay between release of the actuator and movement of the contacts.
  • the switch contacts can be arranged to make contact, break contact, or change to a secondicontact after the delay.
  • the switchassembly is useful for motor starting where windings are connected in a time sequence. It also canbetlsed to establish a minimum recycle time for such applications as refrigeration compressors.
  • i i v According to the present invention, release of an actuator frees a spring loaded bellows to expand at a rate determined by an adjustable air outlet flow control. The expanding bellows cause the switch contacts to change their position to accomplish the switching fnnction.
  • FIG. 1 is an elevational view partially in section of a switch according to the present invention
  • FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1;
  • FIG. 3 is a perspective detail of the actuator'and lever members; and v r A I v 5' FIG. 4 is a sectional view taken along line of FIG. 1
  • the switch mechanism of the present invention is housed in a three part case comprising a lower portion 10, an intermediate por tion 11, and an upper portion 12.
  • the housing portions are assembled with screws.
  • Lower portion 19 includes a pair of moving contact blade members 13 associated with a spring 14 whichprovides toggle action to bias the moving contact blade members 13 upwardly or downwardly against fixed contacts in a conventional manner.
  • F contact members 16 and 18 are afiixed to the lower portion such that the moving contact blade members can establish spring-biased contact with the fixed contacts.
  • the switch assembly illustrated in FIG. 1 the normal condition completes the circuit with fixed contacts 1.
  • a vertically reciprocable blade carrier l9fhaying blade receiving grooves is located between the pair of contact blade members 13 such that upward motion of the blade carrier 19 from the position illustrated in FIG. 1 will cause the contact blade members 13 to snap over to establish contact with fixed contacts 16.
  • a spring 23 biases blade carrier 19 upwardly.
  • Intermediate honsing portion I1 includes a bellows member 20 which is formed of elastomeric material.
  • an actuator spring 22 which acts downwardly against a disc member 24 affixed to or integral with a plunger.
  • Spring 22 tends to urge the plunger downwardly to extend the bellows and to cause actuation of the switch contacts.
  • Spring 22 has a spring rate great enough to overcome the bias of spring 23.
  • Another spring 28 bears against an annular washer member 27 associated with the plunger Spring 28 is'arranged to bias a movable annular washer member upwardly of the plunger 26 against the lower edge portion 21 of the bellows member 29 to urge the bellows 'edge 21 against the disc 24 to form therewith acheclt valve.
  • the upper housing portion -12 includes an air inlet plug valve member 30 having a tapered plug portion 31 and having a portion 32 in threaded association with an insert member 33 affixed in upper housing portion 12 to permit vertical position adjustment of the tapered portion 31.
  • the vertical adjustability of plug valve member 3 permits a variable clearance between the tapered portion 31 and the bore 34 into whichit fits.
  • This clearar ce provides an air inlet orifice of variable dimension leading to the interior of the bellows member
  • a pad of filter material 38 such as polyurethane foam is included in the upper housing portion 12 and serves to clean the air before it enters the clearanee space about the tapered portion 31 of valve member
  • Adjustment of plug valve 30 is accomplished by a screwdriver, slot 35 in the protruding threaded portion 32.
  • a cover36 may be provided to discourage tampering with the adjustment and for protection.
  • Actuator member 40 is a rod vertically reciprocable within a vertical bore in the housing and is biased upwardly by a spring 42.
  • actuato'rportion is located ina slot in a bifurcated lever member tit) which comprises a pair of similar lever members 61, 62 integrally joinedl
  • Actuator 40 includes a portion 45 transverse toportion'di. transverse portion overlies the proximal. ends.
  • Lever 60 is pivoted with respect to the housing by a trunnion 6 3.
  • the distal ends film] a yoke about a plunger 26 and are arranged to bea against annolar washer 2 7 whieh is fixed to plu nger 26.
  • Downward rnotion of actuator 41) thus results inupward motion ofappelr t v Operation of the device will now be described.
  • the device is wired in series with a relay coil and physically associated the relay such that the actuator ⁇ 10 isdepressed so by the relay until the relay is deurbaned whereupon the delay function of the device prevents reenergizing the relay coil until elapse of the delay interval.
  • Downward movement of the actuator 40 causes ledge of the actuator to engage pro:- jection 17 of the contact blade carrier 19 to secure maintenance of the initial contact condition whereincontact with fixed contacts 18 prevails.
  • Edge 21, washer spring 28, and the surface of plunger cooperate to form a check valve whichrelieves superatmospheric pressure with the bellows during collapsebut seals againstingress of air when the bellows interior subatmos'pheric during extension.
  • i t A v v v V i Release of the actuator initiates the delay function.
  • Spring 42 moves actuator 40 upwardly Ledge no longer blade carrier down. Spring urges blade carrier upwardly causing contact blades l3to through ahori zontal posi tion.
  • blade spring 14 is stre ht Spring provides an overcentering toggle" action" which causes the blades 13 to snap downwardly against fixed contacts 16 accomplish Simt ltaneous with actuator release; lever member 60 is released thereby freeing the-collapsed so that they may expand.
  • the checkvalve constituted by bellows edge 21, annular washer and spring closes during extensionof the bellows due to the subatmospheric pressure in the bellows.
  • the w at w s the allot was is shed.
  • y th a s at which air is permitted to enter the bellows through the adjustable orifice whose dimensions are determined by the adjustment ot inlet air valve 39.
  • the above-described device provides a pneumatic time delay switch having a repeatable time delay of great accuracy.
  • the delay is adjustable over a wide range of times.
  • the device is insensitive to the cleanliness of its environment.
  • the arrangement of the moving contact blades provides rapid and positive contact establishment and maintains adequate contact pressure with: the resulting benefits and reduced arcing, contact sticking, and insensitivity to shock and vibration.
  • An adjustable delay time electrical switch having first and second positions, electrical contacts movable between the first position and the second position, fixed contact means engageable by said movable contacts in at least one of said positions, a movable actuator for holding said movable contacts in the first position when actuated, biasingmeans for moving the movable contacts to the second position upon release of the actuator, and a pneumatic time delay device for effecting return of the movable contacts to the first position upon elapse of a delay time after release of the actuator, said time delay device comprising a bellows arranged to be collapsed when the actuator is actuated and spring biased to extend upon actuator release, said bellows being associated with the movable contacts by means of a'reciprocable plunger member which effects the return of the movable contacts from the second to the first position upon extension, an adjustable air orifice to admit air to the interior of the bellows during their extension, the rate of air admission being determinative of the delay time, and a check valve for exhausting the air from the bellows during their

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  • Switches Operated By Changes In Physical Conditions (AREA)
  • Diaphragms And Bellows (AREA)
US827363A 1969-05-23 1969-05-23 Pneumatic time delay switch with improved auxiliary manual switch actuator means Expired - Lifetime US3585321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82736369A 1969-05-23 1969-05-23

Publications (1)

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US3585321A true US3585321A (en) 1971-06-15

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Application Number Title Priority Date Filing Date
US827363A Expired - Lifetime US3585321A (en) 1969-05-23 1969-05-23 Pneumatic time delay switch with improved auxiliary manual switch actuator means

Country Status (3)

Country Link
US (1) US3585321A (enrdf_load_stackoverflow)
AU (1) AU1525870A (enrdf_load_stackoverflow)
GB (1) GB1305287A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798397A (en) * 1971-11-10 1974-03-19 Siemens Ag Time delay switch having contact ram actuator and energy storage means
US3814872A (en) * 1972-04-24 1974-06-04 Polaroid Corp Remote control system for photographic apparatus
US3833778A (en) * 1971-12-08 1974-09-03 Telemecanique Electrique Bellows-type time delay device for retarded switch
US4038619A (en) * 1975-10-01 1977-07-26 Cutler-Hammer, Inc. Pneumatic timer
FR2422849A1 (fr) * 1978-04-12 1979-11-09 Allen Bradley Co Mecanisme de reglage pour un temporisateur pneumatique
US4181829A (en) * 1978-04-12 1980-01-01 Allen-Bradley Company Time delay switch actuating mechanism
US4655313A (en) * 1985-08-26 1987-04-07 Outboard Marine Corporation Vehicle seat switch

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543090A (en) * 1945-10-08 1951-02-27 Fed Electric Prod Co Switch
US2996155A (en) * 1959-03-23 1961-08-15 Priesemuth Wolfgang Dashpot device
US3178524A (en) * 1962-04-20 1965-04-13 Bliss E W Co Pneumatically timed electric switch arrangement
US3209094A (en) * 1962-11-05 1965-09-28 Robertshaw Controls Co Pressure switch with high and low pressure spring adjustments
US3268675A (en) * 1964-10-19 1966-08-23 Furnas Electric Co Actuator for bellows type time delay switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543090A (en) * 1945-10-08 1951-02-27 Fed Electric Prod Co Switch
US2996155A (en) * 1959-03-23 1961-08-15 Priesemuth Wolfgang Dashpot device
US3178524A (en) * 1962-04-20 1965-04-13 Bliss E W Co Pneumatically timed electric switch arrangement
US3209094A (en) * 1962-11-05 1965-09-28 Robertshaw Controls Co Pressure switch with high and low pressure spring adjustments
US3268675A (en) * 1964-10-19 1966-08-23 Furnas Electric Co Actuator for bellows type time delay switch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798397A (en) * 1971-11-10 1974-03-19 Siemens Ag Time delay switch having contact ram actuator and energy storage means
US3833778A (en) * 1971-12-08 1974-09-03 Telemecanique Electrique Bellows-type time delay device for retarded switch
US3814872A (en) * 1972-04-24 1974-06-04 Polaroid Corp Remote control system for photographic apparatus
US4038619A (en) * 1975-10-01 1977-07-26 Cutler-Hammer, Inc. Pneumatic timer
FR2422849A1 (fr) * 1978-04-12 1979-11-09 Allen Bradley Co Mecanisme de reglage pour un temporisateur pneumatique
US4181829A (en) * 1978-04-12 1980-01-01 Allen-Bradley Company Time delay switch actuating mechanism
US4655313A (en) * 1985-08-26 1987-04-07 Outboard Marine Corporation Vehicle seat switch

Also Published As

Publication number Publication date
AU1525870A (en) 1971-11-25
GB1305287A (enrdf_load_stackoverflow) 1973-01-31

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Date Code Title Description
AS Assignment

Owner name: COOPER INDUSTRIES, INC, 1001 FANNIN, HOUSTON, TEXA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CROUSE-HINDS COMPANY;REEL/FRAME:004103/0954

Effective date: 19830223