US3761652A - Bell crank type operating means for simultaneously actuating interlocked pair of electrical switches - Google Patents

Bell crank type operating means for simultaneously actuating interlocked pair of electrical switches Download PDF

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Publication number
US3761652A
US3761652A US00222218A US3761652DA US3761652A US 3761652 A US3761652 A US 3761652A US 00222218 A US00222218 A US 00222218A US 3761652D A US3761652D A US 3761652DA US 3761652 A US3761652 A US 3761652A
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US
United States
Prior art keywords
switch
frame
bell crank
control
control according
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
US00222218A
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English (en)
Inventor
C Burns
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.)
Duracell Inc USA
Emerson Electric Co
Original Assignee
PR Mallory and Co Inc
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 PR Mallory and Co Inc filed Critical PR Mallory and Co Inc
Application granted granted Critical
Publication of US3761652A publication Critical patent/US3761652A/en
Anticipated expiration legal-status Critical
Assigned to EMERSON ELECTRIC CO. A CORP. OF MISSOURI reassignment EMERSON ELECTRIC CO. A CORP. OF MISSOURI ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EMHART INDUSTRIES, INC. A CORP. OF CONNECTICUT
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches

Definitions

  • ABSTRACT A bell crank moves a switch actuator blade between a pair of opposed rotary switches to actuate same.
  • Adapting the rotary actuator switch to control mechanism other than the concentric type presents a great deal of problems such as force factors, lost motion within the actuator device, space limitation, and provisions for the device to be controlled by various types of external hardware.
  • an object of the-present invention to provide a control device having a frame for supporting a plurality of electrical switches, supporting and positioning means for the linkage required to actuate the switches, and means on the frame for mounting the frame to a control panel.
  • Another object is to provide a mechanism for actuating the switches that can be easily assembled with a minimum amount of parts and a limited amount of frictional generating surfaces to provide smooth operating conditions.
  • a further object is to provide a fabricated frame for the control which can be assembled during manufacturing or may be assembled when attaching the frame to a chassis.
  • Another object is to provide a control for electrical switches that is neat, compact and having a substan tially uncluttered exterior.
  • FIG. 1 is a side view in section of the control device in one position of operation
  • FIG. 2 is an end elevation of FIG. 1;
  • FIG. 3 is a section taken along line 3-3 of FIG. 2,
  • FIG. 4 is a bottom view of FIG. 1.
  • the invention provides a frame means, comprising a first frame coupled to and co-planer with a second frame, each having a cooperating electrical switch attached thereto.
  • a switch actuating blade Linearly moveable between the frames and positioned to travel in an interference path to operate the electrical switches is a switch actuating blade.
  • the switch actuating blade is coupled to and moveable by a bell-crank, pivotally carried on the first frame.
  • a slot in the first frame in cooperation with a protrusion on the bell-crank, conveniently provides a limit travel control.
  • the bell-crank is formed so as to retainably receive a control lever for manual actuation of the bell-crank, which in turn linearly moves the switch actuating blade. Linear movement of the switch actuating blade will position the switches to an on or off condition.
  • the switch control it includes a frame means 12 having a first frame 14 and a second-frame 116.
  • the first frame member 14 serves as the primary support member, and has formed thereon a pair of outwardly projecting mounting wings 18 for mounting the first frame 14 to a chassis 15, by fastener 17.
  • Another function of the first frame 14 is to provide a mounting for a first rotary actuated electrical switch 22.
  • Switch 22 could be mounted to the frame 14 by some suitable means, such as by welding, for example.
  • Second frame 16 is designed to cooperate with the first frame 14 to provide a support for second rotary actuated switch 27 and to properly align it so as to be con trolled by the same actuator as the switch 22.
  • Rotary actuated switches 22 and 27 are of the type described in the aforementioned U.S. Pat. No. 2,820,864, W. A. Newman, et al., and are controlled by an actuator 23.
  • Actuator 23 includes a pivot post 23', upstanding legs 24 and 25, and an opening 26 in the housing for limiting the travel of the actuator 23.
  • the actuator 23 is coupled to an overcenter spring (not shown) to move the electrical contacts in the switch to an on or off condition.
  • a pivot post 31 for pivotly carrying a bell crank 32.
  • the bell crank 32 includes a first leg 34, a second leg 36, and a tongue 38.
  • First leg 34 is designed to receive a variety of different types of external hardware for transmitting motion from outside a chassis to the bell crank.
  • one of the forms of hardware used is a control lever 40.
  • Control lever 40 provides a mechanical advantage to the control switch as a result of its length.
  • the second leg 36 of the bell crank is hinged to switch blade 46 by a hinge pin 42 for imparting motion from the bell crank to switch actuator means 44.
  • the path of travel of switch blade 46 is transverse to the axis of pivot post 31.
  • a travel limit control 56 is provided to limit the travel of the switch blade. Travel limit control 56 includes a travel limiting tongue 38 which is located on the bell crank and positioned to travel in a slot 58 in first frame 14. It can be seen that as the bell crank is moved to a first position, the distance of travel is controlled by the tongue 38 moving in slot 58 and is stopped at the ends of slot 58.
  • Switch actuating means 44 includes switch blade 46, and bosses 48 and 50, and a retaining tab 60.
  • the retaining tab 60 is provided to retain the distal end of the switch blade 46 opposite that of the hinged end.
  • the tab 60 is retained in a window 62 projecting from the first frame 14.
  • the bosses 48 and 50 engage the rotary switch actuators 23 on switches 22 and 27 respectively. This is achieved by the boss 48 engaging one of the upstanding legs 24 or 25 of the rotary switch actuator 23 on switch 22 and the boss 50 engaging the upstanding legs 24 and 25 of the rotary switch actuator 23 of switch 27.
  • the bosses 48 and 50 actuate their respective rotary switch actuators to an over center condition and allow the rotary switch actuator to then travel at its own speed until the switch actuator is stopped by the windows 26 in the switches 22 and 27.
  • first frame 14 and second frame 16 are so designed that they may be assembled together by their wings 18 and 20 and rigidly attached by welding or other means well known in the art.
  • the frames 14 and 16 may be assembled together at the time they are being attached to a chassis by alligning the mounting Wings 18 of the first frame 14, with the mounting wings of second frame 16 and then rigidly coupling the frames to each other with the same fastener such as mounting screw 17 which mounts the frame means 12 to the control panel through mounting apertures 19.
  • the present invention therefore provides a means for controlling one or more opposed switches by a single control lever to at least two conditions of the switches.
  • a control for electrical switches comprising:
  • frame means b. at least two separate and distinct electrical switch bodies carried in a face to face relationship by said frame means, said electrical switches including rotary switch actuators,
  • a bell crank having first and second legs and mounted for pivotal movement on said frame
  • a switch actuating blade carried by said frame means and hinged to said second leg to move said actuating blade in a linear direction between said electrical switch bodies
  • a control according to claim 1 further including a travel limiting means limiting said pivotal movement of said bell crank.
  • a control according to claim 2 wherein said travel limiting means includes a tongue on said bell crank extending into a slot in said frame means.
  • said frame means includes a pair of switch supporting frames each carrying one of said electrical switch bodies.
  • said engaging means comprises a pair of bosses carried on opposed sides of said switch actuating blade.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Tumbler Switches (AREA)
US00222218A 1972-01-31 1972-01-31 Bell crank type operating means for simultaneously actuating interlocked pair of electrical switches Expired - Lifetime US3761652A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22221872A 1972-01-31 1972-01-31

Publications (1)

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US3761652A true US3761652A (en) 1973-09-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00222218A Expired - Lifetime US3761652A (en) 1972-01-31 1972-01-31 Bell crank type operating means for simultaneously actuating interlocked pair of electrical switches

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US (1) US3761652A (enExample)
JP (1) JPS4887373A (enExample)
CA (1) CA979056A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927276A (en) * 1974-05-03 1975-12-16 Mallory & Co Inc P R Switch assembly with limit stop structure allowing alternate make and break operational switch states
US4766270A (en) * 1985-07-12 1988-08-23 Square D Company Limited force interlock mechanism
US20100038966A1 (en) * 2008-07-30 2010-02-18 Gen-Tran Corporation Automatic transfer switch

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187120A (en) * 1962-10-08 1965-06-01 Burroughs Corp Multi-contact manually-operated electric switch with lever actuating means
US3199017A (en) * 1961-01-12 1965-08-03 Picker X Ray Corp Walte Mfg Di Voltage control mechanism utilizing a single control knob
US3329778A (en) * 1965-11-08 1967-07-04 Indak Mfg Corp Electrical switches with improved internal structure for grounding the contactor to the casing
US3604863A (en) * 1969-07-07 1971-09-14 Indak Mfg Corp Multiposition electrical switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3199017A (en) * 1961-01-12 1965-08-03 Picker X Ray Corp Walte Mfg Di Voltage control mechanism utilizing a single control knob
US3187120A (en) * 1962-10-08 1965-06-01 Burroughs Corp Multi-contact manually-operated electric switch with lever actuating means
US3329778A (en) * 1965-11-08 1967-07-04 Indak Mfg Corp Electrical switches with improved internal structure for grounding the contactor to the casing
US3604863A (en) * 1969-07-07 1971-09-14 Indak Mfg Corp Multiposition electrical switch

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927276A (en) * 1974-05-03 1975-12-16 Mallory & Co Inc P R Switch assembly with limit stop structure allowing alternate make and break operational switch states
US4766270A (en) * 1985-07-12 1988-08-23 Square D Company Limited force interlock mechanism
US20100038966A1 (en) * 2008-07-30 2010-02-18 Gen-Tran Corporation Automatic transfer switch
US8222548B2 (en) 2008-07-30 2012-07-17 Generac Power Systems, Inc. Automatic transfer switch

Also Published As

Publication number Publication date
CA979056A (en) 1975-12-02
JPS4887373A (enExample) 1973-11-16

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Legal Events

Date Code Title Description
AS Assignment

Owner name: EMERSON ELECTRIC CO. A CORP. OF MISSOURI, MISSO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EMHART INDUSTRIES, INC. A CORP. OF CONNECTICUT;REEL/FRAME:005691/0720

Effective date: 19910125