US3746808A - Delayed snap action microswitch - Google Patents

Delayed snap action microswitch Download PDF

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Publication number
US3746808A
US3746808A US00218274A US3746808DA US3746808A US 3746808 A US3746808 A US 3746808A US 00218274 A US00218274 A US 00218274A US 3746808D A US3746808D A US 3746808DA US 3746808 A US3746808 A US 3746808A
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US
United States
Prior art keywords
spring
switch
casing
rocking member
rocking
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
US00218274A
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English (en)
Inventor
C Bechtiger
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RELHOR
Original Assignee
RELHOR
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Filing date
Publication date
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Publication of US3746808A publication Critical patent/US3746808A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H7/00—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts
    • H01H7/08—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts with timing by mechanical speed-control devices
    • H01H7/10—Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts with timing by mechanical speed-control devices by escapement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/20—Driving mechanisms
    • H01H13/24—Driving mechanisms with means for introducing a predetermined time delay

Definitions

  • ABSTRACT A microswitch having a snap action, wherein depression of an operating button to a predetermined joint first tensions an operating spring, then when moved beyond the point releases an operating lever which starts a delay mechanism, and finally causes a rapid action of the contacts of the switch.
  • the present invention relates to a delayed snap action microswitch having a contact lever which snaps over from a rest position through a dead centre position into a second switch position.
  • a pretensioned actuating member for the switch lever constantly acting in the same direction, the release point for the said actuating member being defined by the position of an operating button during depression thereof. The switching action takes place after a delay derived from an escapement.
  • a microswitch having a contact lever which under the action of a spring is able to snap over from a-rest position through a dead centre position into a second switch position, including an actuating member pretensioned by a constantly acting force, for the switch lever and acting independently of the switch position, the release of said actuating member beingdetermined by the position of a depressible actuating button, and an escapement delaying the said'switching action after release of the actuating member.
  • FIG. 1 shows a schematic overall view of the microswitch with its principal elements
  • FIG. 2 shows the mechanism of the said microswitch
  • FIG. 3 shows a modified mechanism of the microswitch
  • FIG. 4 shows the interior of the switch compartment.
  • the switch has a normal position shown in FIG. 2 i.e. the operating button 4 actuatable from the outside, is
  • the lever 8 commences to rotate in an anti-clockwise direction in FIG. 2, due to the force acting via the connecting lever 17 (FIG. 4) and the pin 18 (FIG. 1, 2 and 4) this rotation oscillating the armature 14 via the pins 24 and 25.
  • the oscillating rate is determined by the rating of the switch spring 16 (FIG. 4) and the mass of the oscillating parts.- This mass may be varied by attachment of rings 27 to the shaft 26, so that the time interval between the instant of release of the armature 14 by the spring pin 13 and the snapping over of the switch lever 28 (FIG. 4) as determined by the position of the communicating lever 28 (FIG. 4) can be accurately predetermined or adjusted.
  • spring pin 13 blocks the armature 14 before the switch lever 28 (FIG. 4) snaps over into the second'switch position, so that the electric switching state remains unchanged at the terminals 32 (FIG. 1) of the microswitch.
  • buttons 4 If button 4 remains depressed for a sufficient length of time such that the whole switching operation action occurs and the microswitch changes over, then the switch remains in the changed-over position until the button-4 is released, whereupon the latter is returned to its original position (as shown in FIG. 2) due to the force stored in the spring 12.
  • This same force which acts via the lever 5 on the button 4 also causes the spring 7 via the pin 9 to return the lever 8, and the lever 8 via pin 18 returns the connecting lever 28 into its original position.
  • the freewheel gear 21 includes a freewheel clutch which permits the pinion 20 to rotate freely in an anti-clockwork direction, the following gear train is not rotated therewith; this permits an unobstructed return of all the said parts. This reverse movement is controlled by the button as in conventional microswitches.
  • FIG. 3 shows an alternative embodiment which carries out a switching movement only during the return movement of the button 4. This is effected in that the lever 5 is not actuated directly by the button 4 but by an additional lever 29 pivoted at 30, and a pin 31 inserted in the lever to effect return of the button 4.
  • the action of the switching operation is the same as in the first embodiment.
  • the main difference is that the spring 12 of the embodiment of FIG. 3 in order to compensate the torque of the lever 5 exerts on the latter a force acting in the opposite direction to that described in FIG. 2.
  • This second embodiment has the same advantages as those described in connection with the first embodiment.
  • a micro-switch comprising a casing, a snap action switch lever in said casing, a connecting member rockingly mounted in said casing and engageable by said switch lever, a switch spring connected between said switch lever and said connecting member, an actuating member operable from the outside of said casing, a spring-loaded rocking member mounted in said casing and operable by said actuating member, a trigger on said rocking member, a second rocking member mounted in said casing and normally restrained against movement by said spring-loaded rocking member, said second rocking member carrying a follower operable by said connecting member, an escapement whee] pivoted in said casing, means operable by said second rocking member to drive said escapement wheel, an escapement armature rockingly mounted in said casing and cooperative with said escapement wheel, said armature comprising a tip engaged with and normally restrained by said trigger, movement of said springloaded rocking member through operation of said actuating member disengaging said second rocking member and freeing said armature tip from said
  • a micro-switch as claimed in claim 1, comprising a support on said second rocking member, a spring mounted on said spring-loaded rocking member and normally engaging by its one end said support before said actuating member is operated, and released from said support on the beginning of a movement of said actuating member.
  • Claiml', line 3, (Column 2, line 58) change "and engageable by" to adjacent Signed and sealed this 16th day of April 197R.

Landscapes

  • Mechanisms For Operating Contacts (AREA)
  • Mechanical Control Devices (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US00218274A 1971-02-12 1972-01-17 Delayed snap action microswitch Expired - Lifetime US3746808A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH211571A CH549273A (de) 1971-02-12 1971-02-12 Mikroschalter.
US21827472A 1972-01-17 1972-01-17

Publications (1)

Publication Number Publication Date
US3746808A true US3746808A (en) 1973-07-17

Family

ID=25689554

Family Applications (1)

Application Number Title Priority Date Filing Date
US00218274A Expired - Lifetime US3746808A (en) 1971-02-12 1972-01-17 Delayed snap action microswitch

Country Status (6)

Country Link
US (1) US3746808A (enExample)
CH (1) CH549273A (enExample)
DE (1) DE2202050C3 (enExample)
FR (1) FR2125303B1 (enExample)
GB (1) GB1365833A (enExample)
NL (1) NL7200781A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6492606B1 (en) 2001-08-21 2002-12-10 Electroswitch Corporation Snap action switch

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148790A (en) * 1935-08-14 1939-02-28 Agfa Ansco Corp Time controlled electrical switch
US3094602A (en) * 1960-07-13 1963-06-18 Frachon Marc Push-rod switches

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148790A (en) * 1935-08-14 1939-02-28 Agfa Ansco Corp Time controlled electrical switch
US3094602A (en) * 1960-07-13 1963-06-18 Frachon Marc Push-rod switches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6492606B1 (en) 2001-08-21 2002-12-10 Electroswitch Corporation Snap action switch

Also Published As

Publication number Publication date
GB1365833A (en) 1974-09-04
FR2125303B1 (enExample) 1976-07-23
DE2202050A1 (de) 1972-08-17
NL7200781A (enExample) 1972-08-15
CH549273A (de) 1974-05-15
FR2125303A1 (enExample) 1972-09-29
DE2202050C3 (de) 1975-07-03
DE2202050B2 (de) 1974-11-21

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