US3674952A - Lockswitch - Google Patents

Lockswitch Download PDF

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Publication number
US3674952A
US3674952A US83893A US3674952DA US3674952A US 3674952 A US3674952 A US 3674952A US 83893 A US83893 A US 83893A US 3674952D A US3674952D A US 3674952DA US 3674952 A US3674952 A US 3674952A
Authority
US
United States
Prior art keywords
lever
housing
bimetal strip
plunger
lock switch
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
US83893A
Other languages
English (en)
Inventor
Jakob Ellenberger
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.)
Ellenberger and Poensgen GmbH
Original Assignee
Ellenberger and Poensgen GmbH
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
Priority claimed from DE19691953983 external-priority patent/DE1953983C3/de
Application filed by Ellenberger and Poensgen GmbH filed Critical Ellenberger and Poensgen GmbH
Application granted granted Critical
Publication of US3674952A publication Critical patent/US3674952A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
    • E05B47/0009—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with thermo-electric actuators, e.g. heated bimetals

Definitions

  • a lock switch for washing machine doors and the like having a 58] Field of Search ..60/23; ZOO/61.64, 67 D; l ing plunger which is moved by a lever which is acted on by 236/68 R; 3l0/4.l; 337/1, 77, 101, 102, 103, 104, a bimetal strip.
  • the strip may be caused to bend by a heating 107, 1 12, 377; 219/511 coil, and the bending movement is transmitted to the plunger by the lever.
  • a lock switch including a plunger having a locking position and a retracted position, a pivoted lever having a free end of which engaging the plunger, and a bimetal strip fixed to the lever adjacent the pivot thereof and also secured to a housing for the switch, wherein bending of the bimetal strip causes rotation of the lever and consequent movement of the plunge to the locking position from the retracted position.
  • a locking spring adapted to restrain the lever in positions wherein the plunger is in the locking position, and the retracted position.
  • This spring may be supported on a resilient support adjustable by means of a screw in the housing.
  • the bimetal strip may be substantially parallel to the lever.
  • a pair of electrical contacts are provided which may be connected to two lugs outside the housing and can be closed by the lever on bending of the bimetal strip to close a circuit outside the switch;
  • the switch may operate an electric motor which is only intended to operate when the plunger is in its locking position.
  • the strip may be provided with a first heating coil for rapid heating of the strip.
  • a second heating coil can be provided to operate in series with the first coil when the strip is bent, the coils together maintaining the elevated temperature of the strip without increasing it.
  • the second coil if provided, is short circuited when the strip is cold, but bending of the strip opens contacts arranged to bring the second coil into series with the first, and much reduce the current flow through the first, thus reducing the total heating effect.
  • a resistor may be provided in place of the second coil.
  • the lever may be pivoted on pins integral with the housing, which may be in two halves, a pin being provided on each.
  • a U-shaped metal member on the lever may be used to support the bimetal strip, and this member can be fixed between two parallel parts of the lever, which may be of insulating material. The two parts can be fixed at another end to a metal member supporting one end of the locking spring.
  • FIG. 1 is a sectional view of one form of lock switch according to the invention, the switch being in the cold state of the bimetal strip, with the plunger in the retracted position;
  • FIG. 2 shows the switch of FIG. 1 in alternative state with the plunger in its locking position.
  • the lock switch shown in FIGS. 1 and 2 has a housing consisting of two housing halves of which only one housing half 1 is shown.
  • a plunger 2 is mounted for displacement in corresponding recesses formcd in the housing halves and has a projection 3 which, in its retracted position shown in FIG. 1, bears against a stop 4 on the housing.
  • the central portion 5 of the plunger is flat and has two pins 6, projecting out on both sides, and engaging between them a lever 7 consisting of two spaced insulating plates 8 (only one of which is shown), which are maintained apart by and fixed to a metal plate 10, which has projections 11 engaging in apertures in the plates 8.
  • the insulating plates 8 are pivotally mounted on pins 12 on the housing halves at their ends remote from the plunger 2, and at their ends adjacent the pins the halves are held apart by a U- shaped metal member 9 to which they are fixed.
  • a bimetal strip 13 having two heating coils 14 and 15, which are both electrically connected at their right-hand ends 16 and 17, to the right-hand end of the bimetal strip 13.
  • the left-hand ends 18 and 19 of the two heating coils 14 and 15 are connected to lugs 20 and 21 outside the housing.
  • the heating coil 14 is wound on an insulating sleeve 22 and the heating coil 15 on an insulating sleeve 23.
  • a contact spring 25 is riveted at 24 to the righthand end of the bimetal strip 13 and is electrically connected with it and with the heating coils 14 and 15.
  • the contact spring 25 carries a contact 26 bearing against a fixed contact 27 which is mounted on an extension 28 of the connecting lug 21.
  • the extension 28 passes through a large aperture 29 in the central portion of the U-shaped member 9, and between the pivot pins 12.
  • the extension 28 has an insulating sleeve 30 in the region of the member 9.
  • Two further connecting lugs 31 and 32 are provided, connected respectively to a contact spring 33 having at its righthand end a contact 34 and a fixed contact 35 with which contact 34 can make contact.
  • a projection 37 on one insulating plate 8 abuts the contact spring 33 at its outer end 36.
  • a semi-circular working spring 38 is supported between the metal plate 10 and a lever 39 secured at its end 40 to the housing.
  • the lever 39 is resilient and is adjustable by a screw 41 the head of which is in a recess formed in the housing halves and accessible through an aperture 42.
  • the spring 38 as shown in FIG. 1, urges rivet 24 in the bimetal strip against a projection 43, while a projection 44 also holds the rivet 24 against this projection 43.
  • Pivoting of the lever 7 causes contacts 34 and 35 to close, so that current may be passed, for example, to a motor. Bending of the bimetal strip 13 moves the spring arm 25 so that the contacts 26, 27 are broken. When this occurs, current flows through both coils 14 and 15 which are then connected in series via their right hand ends. Because the coils are now in series, the current is much reduced, and is just sufircient to retain the bimetal strip 13 in the curved position of FIG. 2. The bimetal strip 13 is thus protected against overheating or strain. A cooling time may be established for the bimetal strip 13 which is less than 90 seconds. A resistance could be used in place of the second coil 15, to be switched into the circuit of coil 14 on bending of the bimetal strip. When current to lugs 20 and 2 l is switched off, the bimetal strip quickly unbends, and the plunger is retracted.
  • switches according to this invention are small, compact and robust.
  • the provision of a locking spring reduces the effects of shocks on the switch, since the lever is held by the spring in one of two positions.
  • a lock switch for locking washing machine doors or the like comprising:
  • a locking plunger mounted on said housing for movement between a retracted position and a locking position
  • a lever mounted on said housing by a pivot and operably connected adjacent its outer end to said plunger;
  • a bimetal actuator secured at one end to said housing and fixed at the other end to said lever adjacent said pivot and remote from said outer end of the lever, said actuator being operable by application of heat thereto to rock said lever about said pivot and thereby slide said plunger to move the latter between said retracted position and said locking position.
  • a lock switch as claimed in claim 1 further comprising a locking spring attached to said lever and said housing for restraining said lever in positions wherein said plunger is in its locking position and its retracted position.
  • a lock switch as claimed in claim 1 further comprising a pair of contacts supported by said housing, each of these contacts being electrically connected with a separate lug, one of said contacts being actuated by said lever upon its pivoting to engage the other contact.
  • a lock switch as claimed in claim 1 further comprising a heating coil associated with said bimetal strip and connected to the line voltage for rapid heating thereof, an electrical resistance also associated with said bimetal strip and a pair of electrical contacts, an arm attached to said bimetal strip and supporting one of said contacts, means supported by said housing separate from said bimetal strip supporting said other contact, said contacts being closed when said bimetal strip is cold so as to short circuit said resistance, and said contacts being open when said bimetal strip is bent so as to connect said resistance in series with said heating coil.
  • a lock switch as claimed in claim 5 further comprising a U-shaped member attached to said lever and surrounding said pivot, means defining an aperture in said U-shaped member, said bimetal strip being connected at its other end to said U- shaped member, and a projection from said housing through said aperture carrying the other of said contacts.
  • a lock switch comprising:
  • a locking plunger mounted on said housing for movement between a retracted position and a locking position
  • a lever mounted on said housing by a pivot and operably connected to said plunger
  • a lock switch as claimed in claim 8 wherein said lever comprises two insulating plates held apart by said U-shaped member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Thermally Actuated Switches (AREA)
  • Push-Button Switches (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • General Induction Heating (AREA)
US83893A 1969-10-27 1970-10-26 Lockswitch Expired - Lifetime US3674952A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691953983 DE1953983C3 (de) 1969-10-27 Verriegelungsvorrichtung für Waschmaschinentüren

Publications (1)

Publication Number Publication Date
US3674952A true US3674952A (en) 1972-07-04

Family

ID=5749338

Family Applications (1)

Application Number Title Priority Date Filing Date
US83893A Expired - Lifetime US3674952A (en) 1969-10-27 1970-10-26 Lockswitch

Country Status (6)

Country Link
US (1) US3674952A (de)
JP (1) JPS4910878B1 (de)
CH (1) CH520225A (de)
FR (1) FR2066618A5 (de)
GB (1) GB1286177A (de)
SE (1) SE356771B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3743977A (en) * 1972-04-27 1973-07-03 Bell Telephone Labor Inc Latching switch
US3761855A (en) * 1972-04-27 1973-09-25 Bell Telephone Labor Inc Latching switch
US3873955A (en) * 1971-01-25 1975-03-25 Frederick T Bauer Electrical switch for primary control system for furnaces
US3892933A (en) * 1971-11-26 1975-07-01 Onofrio Rocchitelli Apparatus for locking and related releasing of closure devices of doors of machines, more particularly for washing machines
US4032180A (en) * 1973-08-21 1977-06-28 Texas Instruments Incorporated Locking device for washing machine door
DE3521777A1 (de) * 1984-06-22 1986-02-13 Texas Instruments Italia S.p.A., Aversa, Caserta Vorrichtung fuer die steuerung der elektrischen versorgung und fuer die verzoegerte verriegelungsfreigabe der tueren von waschmaschinen u.ae.
US6036241A (en) * 1998-03-11 2000-03-14 Maytag Corporation Locking mechanism for an appliance door
CN102021789B (zh) * 2009-09-17 2012-05-09 杭州神林电子有限公司 电磁门盖锁
US20140333410A1 (en) * 2011-07-05 2014-11-13 Siemens Aktiengesellschaft Overload release, in particular for a circuit breaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2810667C2 (de) * 1978-03-11 1982-07-29 Ellenberger & Poensgen Gmbh, 8503 Altdorf Türverriegelungsvorrichtung für elektrische Geräte
DE3008756C2 (de) * 1980-03-07 1985-08-08 Kiekert GmbH & Co KG, 5628 Heiligenhaus Verriegelungsvorrichtung für eine Haushaltsmaschine o.dgl.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE515562C (de) * 1927-03-03 1931-01-07 Birka Regulator G M B H Waermerelaisschaltung, insbesondere fuer elektrische Heiz- und Kuehlapparate
US1853957A (en) * 1925-10-05 1932-04-12 Kohler Co Thermostatic switch
US3210502A (en) * 1963-04-26 1965-10-05 Gen Electric Thermal device having rotatable heater and flexing actuator
US3254183A (en) * 1963-02-11 1966-05-31 Zyrotron Ind Inc Electrical switch panel having thermally responsive actuating means
US3272935A (en) * 1964-01-10 1966-09-13 Controls Co Of America Remotely operated latch mechanism for laundry machines
US3358099A (en) * 1964-12-30 1967-12-12 Bellomayre Michel De Bimetallic-strip and rockable-spring actuated snap-acting switch device
US3458675A (en) * 1965-12-09 1969-07-29 Texas Instruments Inc Safety interlock for appliances
US3526753A (en) * 1966-12-08 1970-09-01 Ardco Inc Anti-shock control devices for electrically heated glass

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1853957A (en) * 1925-10-05 1932-04-12 Kohler Co Thermostatic switch
DE515562C (de) * 1927-03-03 1931-01-07 Birka Regulator G M B H Waermerelaisschaltung, insbesondere fuer elektrische Heiz- und Kuehlapparate
US3254183A (en) * 1963-02-11 1966-05-31 Zyrotron Ind Inc Electrical switch panel having thermally responsive actuating means
US3210502A (en) * 1963-04-26 1965-10-05 Gen Electric Thermal device having rotatable heater and flexing actuator
US3272935A (en) * 1964-01-10 1966-09-13 Controls Co Of America Remotely operated latch mechanism for laundry machines
US3358099A (en) * 1964-12-30 1967-12-12 Bellomayre Michel De Bimetallic-strip and rockable-spring actuated snap-acting switch device
US3458675A (en) * 1965-12-09 1969-07-29 Texas Instruments Inc Safety interlock for appliances
US3526753A (en) * 1966-12-08 1970-09-01 Ardco Inc Anti-shock control devices for electrically heated glass

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873955A (en) * 1971-01-25 1975-03-25 Frederick T Bauer Electrical switch for primary control system for furnaces
US3892933A (en) * 1971-11-26 1975-07-01 Onofrio Rocchitelli Apparatus for locking and related releasing of closure devices of doors of machines, more particularly for washing machines
US3743977A (en) * 1972-04-27 1973-07-03 Bell Telephone Labor Inc Latching switch
US3761855A (en) * 1972-04-27 1973-09-25 Bell Telephone Labor Inc Latching switch
US4032180A (en) * 1973-08-21 1977-06-28 Texas Instruments Incorporated Locking device for washing machine door
DE3521777A1 (de) * 1984-06-22 1986-02-13 Texas Instruments Italia S.p.A., Aversa, Caserta Vorrichtung fuer die steuerung der elektrischen versorgung und fuer die verzoegerte verriegelungsfreigabe der tueren von waschmaschinen u.ae.
US6036241A (en) * 1998-03-11 2000-03-14 Maytag Corporation Locking mechanism for an appliance door
CN102021789B (zh) * 2009-09-17 2012-05-09 杭州神林电子有限公司 电磁门盖锁
US20140333410A1 (en) * 2011-07-05 2014-11-13 Siemens Aktiengesellschaft Overload release, in particular for a circuit breaker
US10529514B2 (en) * 2011-07-05 2020-01-07 Siemens Aktiengesellschaft Overload release, in particular for a circuit breaker

Also Published As

Publication number Publication date
DE1953983B2 (de) 1976-04-08
CH520225A (de) 1972-03-15
SE356771B (de) 1973-06-04
JPS4910878B1 (de) 1974-03-13
FR2066618A5 (de) 1971-08-06
DE1953983A1 (de) 1971-05-19
GB1286177A (en) 1972-08-23

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