US3845265A - Low profile pressure switch with plunger adjusting means - Google Patents

Low profile pressure switch with plunger adjusting means Download PDF

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Publication number
US3845265A
US3845265A US00375780A US37578073A US3845265A US 3845265 A US3845265 A US 3845265A US 00375780 A US00375780 A US 00375780A US 37578073 A US37578073 A US 37578073A US 3845265 A US3845265 A US 3845265A
Authority
US
United States
Prior art keywords
lever
cam
adjusting
plunger
follower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00375780A
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English (en)
Inventor
E Kothe
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.)
Eaton Corp
Original Assignee
Controls Company of America
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Controls Company of America filed Critical Controls Company of America
Priority to US00375780A priority Critical patent/US3845265A/en
Priority to AU69014/74A priority patent/AU6901474A/en
Priority to CA200,598A priority patent/CA991227A/en
Priority to BR4890/74A priority patent/BR7404890A/pt
Priority to JP49075282A priority patent/JPS587214B2/ja
Application granted granted Critical
Publication of US3845265A publication Critical patent/US3845265A/en
Assigned to CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE, SCHILLER PARK, IL., A CORP. OF DE. reassignment CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE, SCHILLER PARK, IL., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Assigned to EATON CORPORATION, A CORP. OF OH. reassignment EATON CORPORATION, A CORP. OF OH. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CONTROLS COMPANY OF AMERICA
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure

Definitions

  • a small adjusting cam is mounted beside and projects below the side of the central housing of the pressure switch.
  • the cam actuates a follower lever which, in turn, actuates an adjusting lever acting on the calibrating (pressure adjusting) spring plunger.
  • the double lever arrangement achieves a motion multiplying effect permitting use of a small cam and, hence, reduces space requirements.
  • the adjusting lever is movable about an axis, one end of which is adjustable by means of a calibrating screw which prevents transmission of forces from the calibrating tool to the lever and thus allows automatic calibration.
  • the extra low setting of the pressure switch is determined by another calibrating screw fixed in the mounting bracket to prevent transmission of adjusting forces to the lever and permit automatic calibration.
  • the cam may be rotated to an extra low position in which the follower lever has no effect on the position of the adjusting lever, the position of the adjusting lever being determined solely by the extra low calibrating screw.
  • a second extra low setting is provided, in which position the cam actuates an arm which may be connected to a clutch or switch altering the speed of a timer, for example, to permit alteration in the operational characteristics of the washing machine in combination with the extra low setting.
  • the pressure switch incorporate additional functions and, from a manufacturing standpoint, it was desired to retain all the better features of the prior designs, particularly those permitting automatic calibration upon completion of assembly.
  • FIG. 1 is a top plan view of the pressure switch.
  • FIG. 2 is an elevation taken as indicated by line 2-2 .on FIG. I.
  • the pressure switch portion of the present apparatus is conventional, having a lower cup 10 with its edge rolled over the upper plastic part 12, as indicated at 14, with the diaphragm 16 captured between the two parts. Pressure variations introduced through fitting 18 will cause movement of the diaphragm and pad 20 to move actuating pin 22. Diaphragm pin 22 moves spring follower 24 opposed by spring 26, the preset compression of which determines the calibration or level selection of the pressure switch. As the diaphragm pin 22 moves upward, it also actuates the tongue 28 of the toggle switch mechanism and when the spring 30 moves over center, blade contact 32 will move from the upper contact 34 and the lower blade contact 36 will snap into engagement with the lower contact 38. This type of arrangement is conventional.
  • the position of the spring cup or plunger 40 determines the degree of compression of spring 26 and, therefore, the calibration of the pressure switch.
  • Pin 42 depends from the plunger 40. If the plunger 40 is moved down far enough, this pin will engage the spring follower 24 and force the follower down and actuate the switch back to its normal position. This, then, makes it possible to positively reset the switch for a new level or pressure setting even though the switch has tripped.
  • the plastic switch housing 12 incorporates a bridge-like portion 44 in which the spring plunger 40 is guided and which provides a flat surface for the purpose of securing mounting bracket 46 to the assembly by screws 48,48.
  • the bracket 46 is stamped and formed to provide various pivots for levers and shafts as will be apparent as the description proceeds.
  • Two tabs 50,52 are formed upwardly to journal shaft 54 upon which the cam 56 is secured.
  • the shaft is designed to project through the back panel of a washing machine with a knob mounted thereon for rotation to obtain the various operational settings to be described.
  • a pair of upstanding ears provide the pivot points for follower lever 58 which has a depending arm portion 60 terminating in a laterally projecting follower 62 which engages the cam.
  • the lever is biased upwardly by spring 64 compressed between the underside of the lever and the top surface of bracket 46.
  • the lever also includes a formed actuating finger 66 which engages the edge of adjusting lever 68 which is pivoted at its right-hand end (FIG. 1) in a fixed pivot 70 and an adjustable pivot 72, the adjustment being achieved by turning bolt or screw 74 to move the corner 72 up or down while the lever rocks about pivot 70 and the point of engagement between the follower lever finger 66 and the adjusting lever 68, thus adjusting the point of engagement of the adjusting lever finger 76 with the center of the plunger 40.
  • the shape of the cam will insure proper positioning of the adjusting lever and, hence, of the plunger.
  • the cam is moved to the extra-low setting (as will be described more fully hereinafter)
  • the follower lever will move out of engagement with the adjusting lever and the position of the adjusting lever is now determined by the calibration of screw 78.
  • the force of the tool used in turning the screw cannot be transferred to the lever 68 and, therefore, automated calibration of this setting is feasible.
  • the cam is turned in the clockwise direction so as to move the follower 62 along the steep ramp portion 80.
  • the maximum rise is reached (FIG. 6)
  • reset is obtained.
  • the further rotation of the cam in the clockwise direction is limited by stop surface 82.
  • the ramp 80 functions along with the force of spring 64 acting on the follower lever to force the cam back to the high level pressure position of the cam as illustrated in FIG. 7.
  • any water level may be selected. Going from the position in FIG. 8 to the extra low position in FIG. 9, the follower 62 is forced to rise up and over the detent hump 84.
  • Lever 94 is biased to its normal position by the coil spring 98 tensioned between anchor 100 on the bracket and anchor 102 on the lever arm.
  • the size of the cam is kept very small in this design due to the use of the motion multiplying effect of the two levers and the ratio of the point of actuation of each lever to the point of utilizing the imparted motion.
  • the spring 64 acting on the follower lever is utilized not only to obtain the detent action but also to return the cam from the reset position. In past designs the spring to return from the reset position was a separate spring which had no other function in the device. Now the spring acting on the cam follower is isolated from the calibrating spring of the pressure switch. Thus the two are distinct and independent from one another.
  • the combination with a pressure switch including a housing having a portion in which a plunger is reciprocally mounted and adjusts a calibrating spring, of
  • lever means biased into engagement with the cam and acting on said plunger and adjusting the calibrating spring
  • lever means is a compound leverage having a motion multiplying effect and including a follower lever engaging said cam and an adjusting lever which acts on said plunger, said biasing means comprising a spring acting on the follower lever.
  • a follower lever mounted on the bracket including a follower engaging the cam
  • adjustable limit stop means effective to position the adjusting lever in said one position.
  • Apparatus according to claim 5 including means for initially adjusting the adjusting lever relative to the plunger independently of the cam and follower.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US00375780A 1973-07-02 1973-07-02 Low profile pressure switch with plunger adjusting means Expired - Lifetime US3845265A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00375780A US3845265A (en) 1973-07-02 1973-07-02 Low profile pressure switch with plunger adjusting means
AU69014/74A AU6901474A (en) 1973-07-02 1974-05-15 Pressure switch
CA200,598A CA991227A (en) 1973-07-02 1974-05-23 Pressure switch
BR4890/74A BR7404890A (pt) 1973-07-02 1974-06-14 Comutador de pressao
JP49075282A JPS587214B2 (ja) 1973-07-02 1974-07-01 アツリヨクスイツチクミタテタイ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00375780A US3845265A (en) 1973-07-02 1973-07-02 Low profile pressure switch with plunger adjusting means

Publications (1)

Publication Number Publication Date
US3845265A true US3845265A (en) 1974-10-29

Family

ID=23482305

Family Applications (1)

Application Number Title Priority Date Filing Date
US00375780A Expired - Lifetime US3845265A (en) 1973-07-02 1973-07-02 Low profile pressure switch with plunger adjusting means

Country Status (5)

Country Link
US (1) US3845265A (enrdf_load_stackoverflow)
JP (1) JPS587214B2 (enrdf_load_stackoverflow)
AU (1) AU6901474A (enrdf_load_stackoverflow)
BR (1) BR7404890A (enrdf_load_stackoverflow)
CA (1) CA991227A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984650A (en) * 1974-07-18 1976-10-05 General Electric Company Fluid pressure diaphragm switch having plural adjustment mechanisms
USRE30207E (en) * 1973-10-23 1980-02-05 Eaton Corporation Means for calibrating pressure switches at extra-low pressure settings
US4755639A (en) * 1987-10-28 1988-07-05 Eaton Corporation Pressure switch with calibration tab
US20080047821A1 (en) * 2006-07-19 2008-02-28 Robertshaw Controls Company One Time High Fill Pressure Switch
US9309898B2 (en) 2012-02-22 2016-04-12 King Nutronics Corporation Multi-fluid precision calibration pressure source

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450854A (en) * 1967-03-30 1969-06-17 Mallory & Co Inc P R Control means for pressure responsive switch
US3498091A (en) * 1968-06-07 1970-03-03 Whirlpool Co Pressure responsive switch having automatic reset means
US3600536A (en) * 1969-12-22 1971-08-17 Controls Co Of America Calibrating pressure switches at extra low-pressure setting
US3609272A (en) * 1969-11-10 1971-09-28 Whirlpool Co Pressure switch with adjusting cam of particular configuration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450854A (en) * 1967-03-30 1969-06-17 Mallory & Co Inc P R Control means for pressure responsive switch
US3498091A (en) * 1968-06-07 1970-03-03 Whirlpool Co Pressure responsive switch having automatic reset means
US3609272A (en) * 1969-11-10 1971-09-28 Whirlpool Co Pressure switch with adjusting cam of particular configuration
US3600536A (en) * 1969-12-22 1971-08-17 Controls Co Of America Calibrating pressure switches at extra low-pressure setting

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30207E (en) * 1973-10-23 1980-02-05 Eaton Corporation Means for calibrating pressure switches at extra-low pressure settings
US3984650A (en) * 1974-07-18 1976-10-05 General Electric Company Fluid pressure diaphragm switch having plural adjustment mechanisms
US4755639A (en) * 1987-10-28 1988-07-05 Eaton Corporation Pressure switch with calibration tab
US20080047821A1 (en) * 2006-07-19 2008-02-28 Robertshaw Controls Company One Time High Fill Pressure Switch
WO2008011494A3 (en) * 2006-07-19 2008-05-08 Robertshaw Controls Co One time high fill pressure switch
US7465894B2 (en) * 2006-07-19 2008-12-16 Robertshaw Controls Company One time high fill pressure switch
CN101490782B (zh) * 2006-07-19 2013-02-20 罗伯特绍控制器公司 一次高填充压力开关
US9309898B2 (en) 2012-02-22 2016-04-12 King Nutronics Corporation Multi-fluid precision calibration pressure source
US10385835B2 (en) 2012-02-22 2019-08-20 King Nutronics Corporation Multi-fluid precision calibration pressure source
US11913439B2 (en) 2012-02-22 2024-02-27 King Nutronics, Llc Multi-fluid precision calibration pressure source

Also Published As

Publication number Publication date
AU6901474A (en) 1975-11-20
BR7404890A (pt) 1976-02-17
JPS587214B2 (ja) 1983-02-08
JPS5036971A (enrdf_load_stackoverflow) 1975-04-07
CA991227A (en) 1976-06-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:004505/0515

Effective date: 19860110

AS Assignment

Owner name: EATON CORPORATION, EATON CENTER, 1111 SUPERIOR AVE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONTROLS COMPANY OF AMERICA;REEL/FRAME:004614/0433

Effective date: 19861002