US3546410A - Electrical safety switch particularly useful with appliances having door-like members - Google Patents

Electrical safety switch particularly useful with appliances having door-like members Download PDF

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Publication number
US3546410A
US3546410A US812702A US3546410DA US3546410A US 3546410 A US3546410 A US 3546410A US 812702 A US812702 A US 812702A US 3546410D A US3546410D A US 3546410DA US 3546410 A US3546410 A US 3546410A
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United States
Prior art keywords
slide member
contact arm
door
movable contact
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
US812702A
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English (en)
Inventor
Norberto Brighenti
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Texas Instruments Inc
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Texas Instruments Inc
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Filing date
Publication date
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Publication of US3546410A publication Critical patent/US3546410A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H15/00—Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
    • H01H15/02—Details
    • H01H15/06—Movable parts; Contacts mounted thereon
    • H01H15/16—Driving mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch 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. for a door switch, a limit switch, a floor-levelling switch of a lift

Definitions

  • the slide member is provided with a stop which precludes the contact arm from engaging the stationary contact when the slide member moves in a first direction or forward stroke in a first orientation but permits the contact arm to engage the stationary contact when moving in the opposite direction or return stroke in a second orientation.
  • the contacts are in engagement only when the slide member is in the first portion of the return stroke which occurs only after the appliance door is locked.
  • PATENTED DEC 8 I976 SHEET '3 OF 4 ELECTRICAL SAFETY SWITCH PARTICULARLY USEFUL WITH APPLIANCES HAVING DOOR-LIKE MEMBERS BACKGROUND OFTHE INVENTION
  • the present invention relates to a switch having a reciprocally mounted slide in which the energization and deenergization of the switch is dependent upon the movement and location of the slide. 1 v a It is often necessary to electrically operate a particular device only after the latter is. safely placed in a particular operating position, as for example an appliance with a door when operation of the device is permitted only after complete closing of the door. A common example of such an appliance is a washing machine.
  • a switch may be mounted inside the washing machine and controlled by an adjustable shaft fastened on the appliance door.
  • the position of the switch must be regulated very accurately because the connecting of the power, through the switch, must take place only at the moment at which the locking hook is about to pass the small plate fastened on the appliance and thus lock the door.
  • the switch for controlling the deenergizingand energizing of a circuit is characterized in that the energizing is effected during the phase in which an operating lever of the switch executes a return motion, and comprises: A housing in which is disposed a movable contact arm pivotally mounted on a support connected to a terminal; a sliding member equipped with biased bearing means for exerting pressure on the movable contact element, the sliding member being able to assume first and second orientations corresponding to its forward and return movement respectively; the sliding member being configured so that in its firstorientation which it assumes when resting it pushes'the movable contact element into the open position, and in its second orientation when moving forward retains the :movable contact element in the open condition; the arrangement being such that when at the beginning of the return stroke of the sliding member it reassumes the first orientation and permits the movable contact arm to energize the electric circuit andmaintains it in this position for a certain distance of the return stroke, the movable contact arm being
  • FIG. 7 shows the switch according to the invention in the energized position.
  • FIG. 8 shows the switch during an intermediate phase of the deenergizing operation of the contacts.
  • FIGS. from 9 to 15 show the invention as used in a closing and locking device for washing machines.
  • terminal 1 shown as a pin connection but which instead could have a screw or welded end, is mounted inside a housing 2 of electrically insulating material with a contact ledge 3 and an integral plate 26 which serves to more effectively align the movable contact arm 5 along with legs 8 and 9 of ledge 3 which extend through slots 6 and 7 respectively formed on arm 5.
  • the terminal also shown as a pin connection, mounts a stationary contact 11 inside housing 2.
  • the movable contact arm 5 is maintained in the open position by a small bearing member 12 which is biased against contact arm 5 by a spring 13 which is seated in a cavity 14 formed in the slide member 15.
  • Lever 32 projects from slide member 15 and serves as the element controlling the operation of the switch.
  • a return spring member 24 pushes the wall 25 of the slide member 15 against the wall 26 of the housing 2.
  • the slots 27,28,29 merely facilitate the fabrication of the slide member by'means of a stamping operation.
  • slide member 15 In the initial position at a first extremity of the guideway the slide member 15 is biased into the first orientation FIGS. 1 and 2) when a sufficient force isexerted by a member (see arrow FIGS. 3, 5 and 6) toward the opposite second extremity of the guideway, slide member 15 moves into the second orientation (FIG. 3).
  • FIGS. from 9 to 15 An illustrative example of an application of this switch is show in FIGS. from 9 to 15 in which is illustrated the switching device according to the invention associated with means for closing a washing machine including a hook (as seen in FIGS. 10, 12 and 14) attached to the washing machine door (not shown) and slide plate 34. Further, similar closing structure is described in copending and coassigned patent application Ser. No. 783,372 filed Dec. 12, 1968 to which reference may be had.
  • FIG. 10 shows this switch in the same position as in FIG. 7, FIG. 11 that of FIG. 2, FIG. 12 that of FIG. 5, FIG. 13 that of FIG. 4 and FIG. 15 that ofFIG. 7-
  • a slide member slidable in the guideway between first and second extremities, the slide member and guideway include means which permit the slide member to assume first and second orientations;
  • movable contact arm means including a movable arm movable in a path into and out of engagement with the stationary contact;
  • a stop member attached to the slide member and interposable in the path of the movable contact arm when the slide member is in the second orientation to prevent the engagement of the movable contact arm with the stationary contact.
  • pivot ledge having two ends with a leg extending downwardly from each end, the ledge located above the guideway intermediate the first and second extremities;
  • a switch according to claim 2 in which an end of the movable contact arm is bifurcated and a plate is placed between the bifurcation which, cooperating with the ledge legs, keeps the movable contact arm in alignment.
  • a switch according to claim 1 in which the means for moving the slide member includes a lever extending from the slide member.
  • a switch according toclaim 4 further including a return spring which contacts the lever and biases the slide member toward the first extremity and the second orientation.
  • the slide member being generally prismatic and having first and second faces which are generally parallel parallelograms and in the first orientation are generally parallel to the side walls, and having third and fourth faces which are generally parallel parallelograms and in the second orientation are generally parallel to the side walls, the first and third and second and fourth faces intersecting each other.
  • a switch for controlling the energization and deenergization of a circuit comprising: a housing, a pivotally mounted movable contact arm disposed in the housing, a support and a terminal mounted in the housing, the support electrically connected to the terminal, the contact arm pivotally mounted on the support; a slide member'having means for exerting a pressure on the movable contact arm, means permitting the slide member to assume first and second orientations corresponding to a forward and return stroke of the slide member respectively; the slide member being conformed so that in its first orientation which the slide member assumes when resting biases the movable contact arm into the open position, and in its second orientation when moving forward retains the movable contact arm in the open condition; at the beginning of the return stroke the slide member returns to the first orientation and operates the said movable contact arm to energize the electric circuit and maintains it in this position for a certain distance of the return stroke, the movable contact arm being returned to the initial open position by the pressure exerting means in correspondence to the final phase of the
  • a switch according to claim 8 in which the movable contact arm is conformed so as to lie in a balanced arrangement in a seat provided on the said terminal, the center of rotation of the said balanced arrangement being disposed in a point intermediate between the extreme positions occupied by the slide member.
  • a switch according to claim 8 in which the said slide member is generally a prismatic body, a guideway is defined by side walls in the housing, and'the slide member is disposed in the guideway and assumes the two orientations correspond ing to the forward and return stroke respectively.
  • a switch according to claim 8 in which the means for exerting pressure on the movable contact arm comprise spring means which provide a biasagainst the movable contact arm.
  • a switch according to claim 8 in which a control lever is provided in perpendicular relation to the axis of pressure on the movable contact arm and cooperates with the slide member.
  • a switch according to claim 8 in which longitudinal centering means is provided to align the movable contact arm.

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  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Slide Switches (AREA)
US812702A 1968-04-05 1969-04-02 Electrical safety switch particularly useful with appliances having door-like members Expired - Lifetime US3546410A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT3609868 1968-04-05

Publications (1)

Publication Number Publication Date
US3546410A true US3546410A (en) 1970-12-08

Family

ID=11244746

Family Applications (1)

Application Number Title Priority Date Filing Date
US812702A Expired - Lifetime US3546410A (en) 1968-04-05 1969-04-02 Electrical safety switch particularly useful with appliances having door-like members

Country Status (7)

Country Link
US (1) US3546410A (enrdf_load_stackoverflow)
JP (1) JPS5519017B1 (enrdf_load_stackoverflow)
DE (1) DE1916564B2 (enrdf_load_stackoverflow)
FR (1) FR2005621A1 (enrdf_load_stackoverflow)
GB (1) GB1252768A (enrdf_load_stackoverflow)
NL (1) NL161606C (enrdf_load_stackoverflow)
SE (1) SE352906B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803725A (en) * 1971-10-29 1974-04-16 Matsushita Electric Ind Co Ltd Clothes dryer with starter safety switch
US3906177A (en) * 1974-06-24 1975-09-16 Theodore E Fiddler Electromotive and fluid pressure force switch with maze valves
US4032180A (en) * 1973-08-21 1977-06-28 Texas Instruments Incorporated Locking device for washing machine door
US4510777A (en) * 1983-12-27 1985-04-16 The Maytag Company Control system for an access door
US6082787A (en) * 1997-12-22 2000-07-04 Bitron S.P.A. Locking and unlocking device of the door of a domestic electrical appliance
US6206073B1 (en) 1999-10-12 2001-03-27 John Jacob Lay Safety system for use with a grain bin
US20040134239A1 (en) * 2003-01-14 2004-07-15 Hapke Kenyon A. Washing machine lid lock with magnetic lid sensor
US7150480B2 (en) 2003-03-17 2006-12-19 Maytag Corporation Appliance lid lock and method for using same
US20080231061A1 (en) * 2007-03-22 2008-09-25 Onofrio Rocchitelli Locking device for the closing lid of washing and drying machines
US20080238113A1 (en) * 2007-03-26 2008-10-02 Onofrio Ricchitelli Locking device for the closing lid of washing machines

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803725A (en) * 1971-10-29 1974-04-16 Matsushita Electric Ind Co Ltd Clothes dryer with starter safety switch
US4032180A (en) * 1973-08-21 1977-06-28 Texas Instruments Incorporated Locking device for washing machine door
US3906177A (en) * 1974-06-24 1975-09-16 Theodore E Fiddler Electromotive and fluid pressure force switch with maze valves
US4510777A (en) * 1983-12-27 1985-04-16 The Maytag Company Control system for an access door
US6082787A (en) * 1997-12-22 2000-07-04 Bitron S.P.A. Locking and unlocking device of the door of a domestic electrical appliance
US6206073B1 (en) 1999-10-12 2001-03-27 John Jacob Lay Safety system for use with a grain bin
US20040134239A1 (en) * 2003-01-14 2004-07-15 Hapke Kenyon A. Washing machine lid lock with magnetic lid sensor
US20060288742A1 (en) * 2003-01-14 2006-12-28 Ark-Les Corporation Washing machine lid lock with magnetic lid sensor
US7251961B2 (en) 2003-01-14 2007-08-07 Ark-Les Corporation Washing machine lid lock with magnetic lid sensor
US7493783B2 (en) 2003-01-14 2009-02-24 Illinois Tool Works, Inc. Washing machine lid lock with magnetic lid sensor
US7150480B2 (en) 2003-03-17 2006-12-19 Maytag Corporation Appliance lid lock and method for using same
US20080231061A1 (en) * 2007-03-22 2008-09-25 Onofrio Rocchitelli Locking device for the closing lid of washing and drying machines
US20080238113A1 (en) * 2007-03-26 2008-10-02 Onofrio Ricchitelli Locking device for the closing lid of washing machines

Also Published As

Publication number Publication date
SE352906B (enrdf_load_stackoverflow) 1973-01-15
NL161606C (nl) 1980-02-15
NL6905295A (enrdf_load_stackoverflow) 1969-10-07
FR2005621A1 (enrdf_load_stackoverflow) 1969-12-12
DE1916564B2 (de) 1971-07-08
JPS5519017B1 (enrdf_load_stackoverflow) 1980-05-23
GB1252768A (enrdf_load_stackoverflow) 1971-11-10
NL161606B (nl) 1979-09-17
DE1916564A1 (de) 1969-10-16

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