US3144530A - Re-settable switch device - Google Patents

Re-settable switch device Download PDF

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Publication number
US3144530A
US3144530A US210647A US21064762A US3144530A US 3144530 A US3144530 A US 3144530A US 210647 A US210647 A US 210647A US 21064762 A US21064762 A US 21064762A US 3144530 A US3144530 A US 3144530A
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US
United States
Prior art keywords
rod
frame
displacement
emergency
normal
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
US210647A
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English (en)
Inventor
Bily Clement
Lescarboura Jean
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Application granted granted Critical
Publication of US3144530A publication Critical patent/US3144530A/en
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
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • H01H21/30—Operating parts, e.g. handle not biased to return to a normal position upon removal of operating force
    • H01H21/34—Operating parts, e.g. handle not biased to return to a normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • 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
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • H01H13/063—Casings hermetically closed by a diaphragm through which passes an actuating member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/63—Contacts actuated by axial cams

Definitions

  • This invention relates to re-settable safety switch devices of the type having one or more electric switch contacts which are adapted to be moved from a normal to a safety position on movement of a monitor member from a normal to an emergency position, and which then require the manual operation of a resetting control to be effected in order to restore the switches to their normal condition.
  • re-settable switch devices there may be mentioned the devices of this type that are used to monitor the movement of a heavy mechanical contrivance such as an elevator cage, part of a hoisting apparatus, or the like. Should such a contrivance accidentally move beyond one of the prescribed limits of its travel, resulting in a'potentially dangerous condition, the contrivance acts on a monitor member in the form of a rotatable lever arm which operates the safety switch device to deenergize an electric motor powering the contrivance, ap ply brakes, and/or effect any other desired safety function. After the dangerous condition has been removed due to the contrivance being returned to within its normal range of movement, it is then necessary to actuate a manual resetting control, e.g. push-button, of the switch device, in order to restore the switching means to their normal condition, such as the motor-energizing condition.
  • a manual resetting control e.g. push-button
  • a re-settable safety switch device comprising a monitor member capable of assuming a normal and an emergency position, switching means, an actuating rod connected with the switching means and displace able axially between a first and a second positions in which the switching means are in a normal and an emergency circuit conditions respectively, camming means movable with the monitor member and engageable with one end of the rod for initiating rod displacement from the first to the second position on movement of the member to its emergency position, a manual re-setting control engageable with the opposite end of the rod for initiating rod displacement from the second towards the first position, and a spring arrangement associated with the rod and 3,144,530 Patented Aug.
  • FIG. 1 is a front view of the sealed switch casing.
  • FIG. 2 is a section on line 11-11 of FIG. 1.
  • FIGS. 30: and 3b are sections on line IIIIII of FIG. 1 respectively in the reset and in the disengaged conditions of the switch device;
  • FIG. 4 is an axial sectional view of an improved resetting push-button on an enlarged scale.
  • the embodiment shown comprises a casing in two parts 1 and 2 assembled by means of screws 3 on opposite sides of an intervening seal 4.
  • the casing part 1 is provided with holes 5 serving to mount the assembly by means of bolts 6 from a supporting structure, e.g. through intermediate brackets 7.
  • the bottom of the casing part 2 is formed with spaced apertures provided with sealing fittings 8 through which conductor cables are passed into and out of the casing for connection e.g. with a motor to be controlled by the device.
  • a bearing 2a see e.g. FIG. 3b
  • a vertical pivot shaft 9 having a cam disc 11 secured on its lower end within the casing and an arm 11 secured to its upper end outside the casing.
  • the cam disc 10 is secured to shaft 9 by a screw 12. Before positioning shaft 9 in its bearing, a seal ring 13 is engaged around the shaft from its reduced-diameter end so as to seat against a shoulder 9a provided at the upper end of the shaft. A key 14 received in a slot in the upper end of shaft serves to secure the seal ring 13 to the shaft for bodily rotation. A bent strip 15 is secured by screws 16 against the seal ring 13 and the upper end of shaft 9 so as to connect lever arm 11 rigidly with shaft 9, whereby rotation of the lever arm 11 about the axis of the shaft will rotate the cam disc 10.
  • Cam disc 10 (also see FIG. 1) is formed with a recess 10a milled in one side of it. It is further formed with a cylindrical hole 1%, and is provided with a pair of angularly spaced projecting fingers 10c serving to limit the rotation of the cam disc.
  • a spring 19 received in a re cess of the casing part 1 acts on a detent ball 17 to urge the latter into the hole 10b and latch the cam disc resiliently in a predetermined angular position.
  • a platen 24 Secured in the casing part 2 by means of screws 21 engaging spacer posts depending from the top of the casing part 2 is a platen 24) which supports the switch assembly presently described. Secured to the under side of platen 20 by way of screws 24 and spacer posts 22 is a cross member 23. Member 23 and platen 20 are centrally formed with aligned holes of square contour through which a rod 25 of complementary form slidably extends. Notches 25a formed in opposite sides of the rod 25 a short distance from platen 2t serve to attach the ends of flexible leaf springs 26 having their free ends engaged in similar notches 22a formed in the posts 22.
  • the leaf springs 26 are mounted in a flexed condition so that when notches 25a are positioned substantially opposite to the notches 22a, the rod 25 is axially positioned in an unstable condition; the leaf springs 26 are then buckled or flexed a maximum amount, so that they will tend to shift the rod 25 to either one of two stable end positions, the upper position shown in FIG. 3a near the cam disc 10, or the lower position shown in FIG. 3b near the bottom of the casing.
  • a re-setting push-button 3 27, presently described in detail, is mounted in a side of the casing part 1 and serves to initiate the shifting of rod 25 towards its upper position.
  • the rod 25 has secured to its upper end, directed toward the cam disc (also see FIG. 2) a cross member 23, and to its lower end directed towards push-button 27 a cross member 29.
  • a pair of switch housings 39 are mounted in casing 12 on opposite sides of rod 25; a base end of each housing 30 engages a complementary aperture formed in the platen 2 and is secured thereto by a screw 31.
  • Within each housing 39 there is sridably mounted an insulating rod 32 of square cross section having one end projecting toward cross member 28 and its opposite end toward cross member 29.
  • Each insulating rod 32 is formed with transverse openings in which contact strips 33 are slidable, being pressed into engagement with side walls of the related openings by compression springs 34 mounted therein.
  • the strips 33 cooperate at their ends with stationary contact segments (not shown) provided within each of the switch housings 30 connected with outlet terminals 35 of the housings 36.
  • the contacts provided by strips 33 and the fixed contact elements are closed when the actuator rod 25 is in the retracted position shown in FIG. 3a as will be presently explained.
  • Each of the insulating rods 32 is shorter than the distance between the cross members 28 and 29.
  • Compression springs 36 interposed between cross member 29 and flanges 37 secured to the rods 32 urge said rods towards the cross member 28.
  • springs 3 interposed between the end walls of the switch housings 3i) and surfaces of the rods 32 urge the rods towards the cross member 29.
  • switch housings such as 30 have been described in Patent No. 2,929,899.
  • arc blow-out means are preferably provided between the contact strips 33 and related fixed contact elements as described in Patent No. 2,995,638.
  • the re-setting push-button 27 is of a sealed construction, as shown in FIG. 4, and comprises a generally cylindrical moulding 39 of rubber-like material over which a rigid cap 49 is fitted.
  • the rubber moulding is formed with a peripheral skirt 39a of V section formed with a flange which engages the walls of an opening 42 formed in the casing part 1 and is secured thereto by means of an annular insert 41 adhesively bonded in place.
  • the annular insert 41 includes a cylindrical portion overlying the inner wall of skirt 39a in the opening 42 so as to prevent damage to the skirt.
  • the V-shaped contour of the skirt 3% urges the button 27 to the depressed position shown in FIG. 4-, fiush with the ring insert 41, so that the projecting position of the button is not a stable position.
  • the pushbutton Since the pushbutton is thus at all times urged to its retracted position within the casing, it tends at all times to remain in engagement with the end of the rod 25 in the reset position of the device, and the ring insert 41 prevents removal or separation of the rod from outside the casing 12 of the apparatus.
  • the apparatus operates as follows:
  • the lever arm 11 In the operative or normal position shown in FIG. 1, the lever arm 11 is normal to the longer sides of the rectangular contour of casing 1-2, and projects into the path of the movable member to be monitored.
  • the arm 11 is held in this position by the detent ball 17 cooperating with aperture 10b.
  • the camming recess 19a registers with the actuator rod 25, so that depression of re-setting button 27 will retract the rod 25 until a nut 43 mounted on the inner end of the rod and serving to secure the cross member 28 to it, is received in the recess 1011.
  • This position of the actuator rod is retained owing to the over-centre action of the leaf springs 26.
  • the force exerted by the leaf springs on the rod 25 also holds the contacts including strips 33 in closed condition, with the contact pressure being determined by the compression of springs 34. In this condition of the apparatus there is established a current path through the contact strips 33 and fixed contact elements to energize the motor moving the member being monitored.
  • the arm 11 is rotated to its emergency position, rotating cam disc 10 so that the walls of cavity 1011 cam the nut 43 and rod 25 in the rightward axial direction of FIG. 2, whereupon the leaf springs 26 are urged towards their unstable intermediate position.
  • the depth of recess 10a is such that the springs reach said unstable position before the nut 43 has quite emerged from out of the recess, so that the springs 26 snap over-centre and propel the rod 25 forcefully towards its projected position, in which movement the rod 25 carries the contact strips 33 in a direction to cutoff the motor supply.
  • the length of displacement of actuator rod 25 is limited on one side by engagement of cross member 28 with platen 20 and on the other side by engagement of cross member 29 with the switch housings 30 containing the movable contact strips.
  • the length of insulating rods 32 therefore is equal to the spacing between the cross members 28 and 29 minus one half the displacement of actuating rod 25.
  • actuator rod 25 with a finger engaging in an elongated aperture formed in insulator rod 32 so as to provide an amount of lost motion for d the finger, longitudinally of actuator rod 25, corresponding to one half the displacement of rod 25.
  • a re-settable switch device comprising a frame, a monitor member pivotally carried by said frame and capable of assuming a normal position and an emergency position, switching means secured to said frame, an actuating rod connected with the switching means and displaceable axially in said frame between a first position and a second position in which positions the switching means are in a normal circuit condition and an emergency circuit condition respectively, camming means fast with said monitor member and engageable with one end of the rod for initiating rod displacement from the first to the second position on movement of the monitor member to its emergency position, a manual resetting control carried by said frame and engageable with the opposite end of the rod for initiating rod displacement from the second towards the first position, and a spring arrangement bearing against said frame, having a pivotal engagement with said rod and imposing, on said rod, a force perpendicular thereto in an unstable intermediate position of said rod, whereby axial displacement of the rod in either direction from one of its end positions past said unstable intermediate position will snap the rod forcefully to its opposite end position, the camming means
  • the camming means comprises a disc-like part rotatable with the monitor member about an axis parallel to the rod.
  • a device wherein said disclike part is formed with a camming recess greater in depth than about one half the total displacement of the rod and adapted to be moved into alignment with the rod on the monitor member assuming its normal position.
  • a device according to claim 3, wherein resilient latching means are provided for holding the cam disc in at least one of its normal and emergency positions.
  • the spring arrangement comprises a pair of flexed leaf springs on opposite sides of the rod and having their inner ends engaged in the rod and their outer ends engaged with said frame.
  • a re-settable switch device comprising a movable contact-holder displaceable a limited distance relatively to said actuator rod, and parallel thereto, between contactclosing and -opening positions.
  • a device wherein said limited distance is substantially equal to one half the total axial displacement of the actuator rod between its end positions.
  • said switching means comprise a movable contact holder displaceable a limited distance relative to said rod and parallel thereto between contact-making and -braking positions, and opposing spring means urging said movable contactholder to an intermediate position relative to said rod.
  • a device including a fixed switch housing having fixed contact means therein and wherein said movable contact holder is slidably displaceable in said fixed switch housing between said positions.
  • said switching means comprise a pair of fixed switch housing extending parallel to and spaced from said actuator rod on opposite sides thereof, fixed contact means in said housings, a pair of movable contact-holder rods supported from said actuator rod for sliding displacement in said respective housings between contact-making and -breaking positions relative to said fixed contacts, and opposing spring means urging said contact holders to intermediate positions relative to said rod.
  • said pushbutton comprises a cylindrical body and a peripheral annular cylindrical flange connected integrally with said body by a V-shaped connecting portion projecting towards the interior of the casing, said cylindrical flange having an end portion engaging said casing aperture, and means securing said flange in said aperture.
  • the resetting contrcl comprises a push-button of moulded elas tomer material mounted in an aperture of the casing of the device in alignment with the related end of the actuator rod and adapted to be urged by its inherent elasticity to a retracted position with its outer end surface substantially flush with the casing wall.
  • said securing means comprise an annular insert engageable with the inner periphery of said flange within the aperture.

Landscapes

  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Switch Cases, Indication, And Locking (AREA)
US210647A 1961-08-11 1962-07-18 Re-settable switch device Expired - Lifetime US3144530A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR870724A FR1304180A (fr) 1961-08-11 1961-08-11 Dispositif interrupteur de sécurité limitant la course d'un mobile

Publications (1)

Publication Number Publication Date
US3144530A true US3144530A (en) 1964-08-11

Family

ID=8761199

Family Applications (1)

Application Number Title Priority Date Filing Date
US210647A Expired - Lifetime US3144530A (en) 1961-08-11 1962-07-18 Re-settable switch device

Country Status (6)

Country Link
US (1) US3144530A (da)
BE (1) BE621142A (da)
DE (2) DE1858960U (da)
ES (1) ES279992A1 (da)
FR (1) FR1304180A (da)
GB (1) GB1005929A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308140A1 (fr) * 1975-04-16 1976-11-12 Fligue Wladimir Bouton-poussoir
US6483058B2 (en) 2000-09-07 2002-11-19 Itt Manufacturing Enterprises, Inc. Sealed manual reset switch

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1675403B1 (de) * 1968-02-29 1972-04-27 Schaltelektronik Veb K Einrichtung zur Abdichtung eines aus einem Schaltgehaeuse ragenden,radial bewegten Betaetigungsteiles
CN106981386A (zh) * 2017-04-10 2017-07-25 合肥梦飞电器有限公司 双重复位电器按钮
CN106981385A (zh) * 2017-04-10 2017-07-25 合肥梦飞电器有限公司 电器按钮

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE937600C (de) * 1953-04-16 1956-01-12 Fritz Werner Ag Elektrischer Endschalter, insbesondere fuer Werkzeugmaschinen
DE1707707U (de) * 1955-07-20 1955-09-29 Kloeckner Moeller Elektrizit Kleinbefehlsschalter, insbesondere endschalter.
BE568997A (da) * 1957-07-03
DE1816388U (de) * 1960-06-27 1960-08-11 Edzard Arends Steuer-schalter.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308140A1 (fr) * 1975-04-16 1976-11-12 Fligue Wladimir Bouton-poussoir
US6483058B2 (en) 2000-09-07 2002-11-19 Itt Manufacturing Enterprises, Inc. Sealed manual reset switch

Also Published As

Publication number Publication date
BE621142A (da) 1962-12-03
DE1180450B (de) 1964-10-29
GB1005929A (en) 1965-09-29
FR1304180A (fr) 1962-09-21
DE1858960U (de) 1962-09-27
ES279992A1 (es) 1963-03-01

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