US3567882A - Burglar alarm switch - Google Patents

Burglar alarm switch Download PDF

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Publication number
US3567882A
US3567882A US37783A US3567882DA US3567882A US 3567882 A US3567882 A US 3567882A US 37783 A US37783 A US 37783A US 3567882D A US3567882D A US 3567882DA US 3567882 A US3567882 A US 3567882A
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United States
Prior art keywords
recess
switch
contact
contacting
base
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
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US37783A
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English (en)
Inventor
Jack Beck
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Individual
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Individual
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
    • 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
    • H01H3/161—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 for actuation by moving a closing member, e.g. door, cover or lid

Definitions

  • a unitary resilient contacting element is partially disposed within a recess formed in an insulating block.
  • One section of the con tacting element is wedged into contact with a first contacting member while another portion of the element is normally maintained in contact (or out of contact) with a second contact member.
  • the contacting element also includes a resilient tongue which extends beyond the recess and is normally urged by the window, when the latter is closed, to maintain the contacting element in its desired relation to the second contact member.
  • the tongue is released, such as when the-window is opened, the contacting element is moved out of (or into) contact with the second contact member to thereby open (or close) the switch.
  • the present invention relates to a burglar alarm system substantially as defined in the appended claims and as described in the following specification taken together with the accompanying drawing in which:
  • FIG. 1 is an illustration showing my burglar alarm switch with the switch in position
  • FIG. 2 is a side sectional view of a prior art type of switch
  • FIG. 3 is an exploded perspective view of the switch according to my invention.
  • FIG. 4 is a sectional view along the arrows 4-4 of FIG. 3;
  • FIG. 5 is a side sectional view showing the relationship of the parts of my switch with the window closed;
  • FIG. 5A is a view similar to FIG. 5 with the window open;
  • FIG. 6 is a side sectional view with the window closed of a normally opened switch.
  • FIG 6A is a sectional view corresponding to FIG. 6 with the window open.
  • the burglar alarm switch is typically is installed adjacent to a window as illustrated in FIG. 1.
  • the window 1 comprises a movable window frame or sash 2 which moves within a fixed frame 3.
  • My switch 12 is installed onto the fixed frame and comprises lead wires 13-14 connected to an alarm 11.
  • the sash 2 is moved away from the contact of the switch 12 to actuate the alarm 11.
  • the alarm 11 is installed in a remote location and may include a bell or other signalling element and/or may be cone connected via a telephone or directly to other alarm receivers.
  • the prior art type of switches used in the trade is shown in FIG. 2.
  • the lead wires 13-14 are attached to connecting screws extending from the top and bottom positions.
  • the contact element comprises multiple parts designated A, B, C, and
  • the tongue C resembles a V arrangement and when depressed towards the switch, the left side of the V presses on a plastic insulated button D which is attached to contact element A.
  • Contact element A depends from the top screw, to which lead 13 is attached.
  • Another contact B depends from the screw attaching lead 14 upwardly. Ordinarily, contacts A and B touch each other.
  • FIG. 2 The prior art switch shown in FIG. 2 is more complicated and expensive to make than my switch which is shown in FIG. 3. Further, my switch involves onlya single, unitary metal spring contacting element and does not require the use of a separate insulated button.
  • My invention comprises a body member having a single springlike contact element and a cover.
  • the body member comprises an integral, one-piece, preferably injection-molded plastic block 20 having a recess 30 formed within the block.
  • the recess is elongated and provides an exit opening slot 32 for the tongue or leaf of my contacting element as will be disclosed.
  • I-Ioles 27-28 extend transversely through the block and are spaced from the recess.
  • a cover 40 is attached to the body enclosing the recess by means of the eyelets 41-42 which respectively extend through the holes 27-28. After the cover is on, the eyelets are bent back upon themselves as shown at 41-42 of FIG. 4 to provide an enclosed and sealed switch and the tongue extends through slot 32.
  • I provide guide and contact posts 25-26 which are preferably in the form of screws which extend from the backwall of the block and into the central recess. These guide posts help locate and align the switch contact element to provide the normally contacting arrangement of FIGS. 3 and 5, or alternatively, the normally noncontacting arrangement illustrated in FIG. 6A.
  • the block 20 having the recess and guide posts is thus adaptable to accommodate the spring contacting element in both the normally open and the normally closed versions, the only difference being in the initial positioning of the contact element. This provides for simplicity and uniformity in the manufacturing process and is an advantage of my invention.
  • the normally contacting embodiment actually corresponds to a normally open switch system when the window is secure, as illustrated in FIG. 5 and then the normally noncontacting embodiment corresponds to a normally closed switch system when the window is secure, as illustrated in FIG. 6.
  • Preferred alarm systems utilize a continuously closed circuit so that the alarm will be actuated whenever there is any opening in the entire circuit, whether it be in the switch 12 or in the lead connections 13-14.
  • Leads 13-14 can extend through many detecting paths such as around windows and the like. It will, therefore, be understood that the preferred embodiment of the switch as shown in which the switch is normally closed when the window is closed, but becomes open when the window is open, as illustrated in FIG. 6.
  • the contacting element 60 comprises an essentially straight middle portion 64 having a lower heel 62 and a first locating portion turned back upon itself to provide a wedgable section 65.
  • the end of section 65 presses against a stop 33 and is bent around contact screw 25 and presses against wall 34 at the point or region 34'.
  • the end of the spring is securely held in place in the switch body and is in tension against and securely contacts screw 25.
  • Other means may be used to locate and anchor one end of the spring in the switch body and to contact screw 25, such as a 'slot formed in the body to receive an extension of the spring.
  • Wall 34 bears inwardly toward wall 33 to urge the entire spring body against wall 33 to enhance the wedge effect.
  • the contact element also comprises a second extending feeler or tongue 61 which makes a V-shape when bent around at 62 with respect to the heel or the entire side 64.
  • upper screw 25 always makes contact with the switch element and also locates the bent around section 65 against the left inner wall 33 of the recess30 to enhance the wedge anchoring effect. It is important to note that the bent around section 65 is held wedged in place and fixedly contacts screw 25 in embodiments of the invention as shown in either FIGS. or 6. It will be noted that the lead wires 13-14 are attached to the respective screws 25-26 as illustrated in FIG. 4 for further connection to the alarm system.
  • an insulative coating may be provided on the tongue where electrical separation of the tongue'from the window frame structure is desirable.
  • a switch comprising an integral block having an internal recess and an exit opening communicating with said recess, and a unitary springlike contacting element disposed in said recess, first and second contacting posts extending into said recess at spaced apart locations, one end of said contacting element being anchored in said block and resiliently contacting one of said contacting posts, said contacting element having a base and a tongue extending from one side of said base and defining with said base a substantially V-shaped section, said tongue extending through said exit opening of said recess for engagement with an external member, said V-shaped section including a bent around portion to provide make and break contact with the other of said contacting posts in response to the external engagement-of said tongue.
  • the switch of claim 1 including two spaced eyelets positioned in said block spaced from said recess to receive screws for fastening said switch to a frame.
  • said springlike contacting element includes a bent around extension extending from said base and wedged in position between the walls of said block defining said recess for providing resilient contact of said bent around extension with said first contact post.
  • one wall of said recess includes a stop for providing support and pressure against the end of said bent around extension.
  • a burglar alarm switch system for attachment to a frame of a window comprising a switch having an integral block including an internal recess and an exit opening in communication therewith, a springlike contacting element in said recess, first and second spaced contacting posts extending into said recess and positioned relativel close to the sidewalls of said recess, said contacting elemen having a base and a first bent around extension extending from one end of said base and a tongue extending from the other end of said base and defining with said base a substantially V-shaped section, said tongue extending through said exit opening, said first extension making resilient contact with said first contact post and being wedged against said sidewalls and said first post, whereby said V-shaped section is bent around said first contact post for making and breaking contact with said second contact post.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Push-Button Switches (AREA)
US37783A 1970-05-15 1970-05-15 Burglar alarm switch Expired - Lifetime US3567882A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3778370A 1970-05-15 1970-05-15

Publications (1)

Publication Number Publication Date
US3567882A true US3567882A (en) 1971-03-02

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ID=21896311

Family Applications (1)

Application Number Title Priority Date Filing Date
US37783A Expired - Lifetime US3567882A (en) 1970-05-15 1970-05-15 Burglar alarm switch

Country Status (3)

Country Link
US (1) US3567882A (show.php)
JP (1) JPS4835876B1 (show.php)
GB (1) GB1311706A (show.php)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968484A (en) * 1975-03-19 1976-07-06 Lawrence Peska Associates, Inc. Spring-actuated security alarm for a door
US4258359A (en) * 1977-10-25 1981-03-24 Mclamb Philip Portable protective device
US4347502A (en) * 1980-05-27 1982-08-31 Johnson Pet-Dor, Inc. Early warning electrical sound alarm system for pet door structure
USD272237S (en) 1981-11-12 1984-01-17 David Preciado Intruder alarm for doors, windows and the like
US4556765A (en) * 1983-05-13 1985-12-03 Pittway Corporation Security interface system for a door, window or the like
US4730091A (en) * 1986-04-16 1988-03-08 Glenn Hiller Alarm switch
US5499014A (en) * 1994-07-01 1996-03-12 Greenwaldt; Gordon E. Security alarm system
WO2006029418A1 (en) * 2004-09-06 2006-03-16 Poznan Aleksandar Komadinovic Switching arrangement for electrical fence
US20090038226A1 (en) * 2007-08-10 2009-02-12 Gerald Angelo Morrone Child safety window block
WO2009023994A1 (fr) * 2007-08-21 2009-02-26 Lok Shun Leung Fenêtre de sécurité avec ensembles de charnière et procédé pour sa production
CN103670242A (zh) * 2013-12-24 2014-03-26 张朝峰 一种带有拉簧的防盗护栏开关及其制造方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8320344D0 (en) * 1983-07-28 1983-09-01 Securistyle Ltd Hinge assemblies
CN105513236A (zh) * 2013-11-18 2016-04-20 苏州汇诚智造工业设计有限公司 一种带有横向弹性连接件的窗口无线报警板
CN105931400A (zh) * 2013-11-19 2016-09-07 宿迁峰驰安防有限公司 带有水平开关的窗口报警板
CN105761396A (zh) * 2013-11-19 2016-07-13 苏州汇诚智造工业设计有限公司 一种带有无线发射器的窗口报警板

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968484A (en) * 1975-03-19 1976-07-06 Lawrence Peska Associates, Inc. Spring-actuated security alarm for a door
US4258359A (en) * 1977-10-25 1981-03-24 Mclamb Philip Portable protective device
US4347502A (en) * 1980-05-27 1982-08-31 Johnson Pet-Dor, Inc. Early warning electrical sound alarm system for pet door structure
USD272237S (en) 1981-11-12 1984-01-17 David Preciado Intruder alarm for doors, windows and the like
US4556765A (en) * 1983-05-13 1985-12-03 Pittway Corporation Security interface system for a door, window or the like
US4730091A (en) * 1986-04-16 1988-03-08 Glenn Hiller Alarm switch
US5499014A (en) * 1994-07-01 1996-03-12 Greenwaldt; Gordon E. Security alarm system
WO2006029418A1 (en) * 2004-09-06 2006-03-16 Poznan Aleksandar Komadinovic Switching arrangement for electrical fence
US20090038226A1 (en) * 2007-08-10 2009-02-12 Gerald Angelo Morrone Child safety window block
WO2009023994A1 (fr) * 2007-08-21 2009-02-26 Lok Shun Leung Fenêtre de sécurité avec ensembles de charnière et procédé pour sa production
CN103670242A (zh) * 2013-12-24 2014-03-26 张朝峰 一种带有拉簧的防盗护栏开关及其制造方法

Also Published As

Publication number Publication date
GB1311706A (en) 1973-03-28
JPS4835876B1 (show.php) 1973-10-31

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