US2511955A - Burglar alarm switch - Google Patents

Burglar alarm switch Download PDF

Info

Publication number
US2511955A
US2511955A US4777A US477748A US2511955A US 2511955 A US2511955 A US 2511955A US 4777 A US4777 A US 4777A US 477748 A US477748 A US 477748A US 2511955 A US2511955 A US 2511955A
Authority
US
United States
Prior art keywords
switch
burglar alarm
alarm switch
casing
drawer
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
US4777A
Inventor
Austin W West
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US4777A priority Critical patent/US2511955A/en
Application granted granted Critical
Publication of US2511955A publication Critical patent/US2511955A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02Details
    • H01H13/12Movable parts; Contacts mounted thereon
    • H01H13/14Operating parts, e.g. push-button
    • H01H13/18Operating parts, e.g. push-button 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

Definitions

  • invention relates tofnew and useful ,im-
  • prov'ementsdn electrical switches and the priv ma object of the present invention isto pro vide a burglar alarm switch.
  • important object of the present invention is to'provide an electric switch mountable on a fixed structural element such as a door jamb, cabinet or the like which will be in a circuit-open position when the door, drawer or the like is in closed position and which will be actuated to a circuit-losing position as the door, drawer or the like is moved to an open position.
  • a further object of the present invention is to provide a burglar alarm switch that is extremely small and compact in structure and which may be quickly and readily applied to or removed from a structural element in a, convenient manner to operate efficiently and which will automatically sound an alarm when tampered with.
  • a still further aim of the present invention is to provide a burglar alarm switch that is simple and practical in construction, strong and reliable in use, neat and attractive in appearance, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.
  • Figure 1 is a fragmentary vertical sectional view of a abinet structure having a drawer which is disposed in a closed position, and showing the present switch in a circuit-open position applied to the same,
  • Figure 2 is a similar view of Figure 1 showing the drawer in an open position and the present switch in a circuit-closed position.
  • a nonccnductive support block 28 Suitably fixed within the casing i0 is a nonccnductive support block 28 having a central guide opening or bore that aligns the guide opening l2 provided in the forward wall H of the casing l0.
  • the guide opening 30 is a preferably steel coil spring 32 one end of which frictionally engages an annular detent 34 punched inwardly from the rear wall 36 of the casing 1B, and the other end of which frictionally embraces the reduced non-conductive stem portion 33 of a plunger 40 constructed of a nonconductive material.
  • This plunger 40 is normally urged by the spring 32 into frictional engagement with the overlapped ends 24 and 26 of the conductive fingers 20 and 22.
  • the numeral 42 represents an annular base member which is recessed in and secured to the rear wall 44 of a movable structural element such as a cabinet or cash register drawer 46.
  • a frusto-conical non-conductive element 48 rigidly carried by the base member projects outwardly from the rear wall 44 to extend through the guide opening l2 in the casing H).
  • the casing in isremovably secured to a fixed structural element 50 such as a cabinet structure and the rivets I6 and iii are connected in any suitable manner to a pair of circuit wires 52 and 54 which lead from a source of current and which are connected to a suitable alarm, either sound, visual or both.
  • the frusto-conical element 43 When the drawer 46 is in a closed position, the frusto-conical element 43 extends through the guide opening [2 into the casing to force the plunger it into the opening 30 and the ends 24 and 26 of the contact fingers 2B and 22 in spread apart relation, as shown best in Figure l of the drawings. In this position, the circuit will be in an open position and the alarm will not emit a sound or be energized. As the drawer 46 is pulled to an open position, the frusto-conical element 45.; will disengage the free ends 24 and 26 of the conductive fingers 20 and 22 and the lunger 40, and the spring 32 will urge the free ends 24 and 26 of the conductive fingers into a circuit-closing position.
  • the present switch is applicable for doors whereby the casing is applied to a door jamb and the element 48 applied to the door. Also, the present switch may be applied to any fixed structural element having a movable portion which will retain the element 48. It is further noted that the switch ould be applied to any structural element with a suitable pressure supplying object supporting the element 48 which will normally cause the switch to be open. When the pressure supplying object is removed from the switch or casing, the [circuit will be closed and the alarm sounded.
  • a switch including; an insulated member having an. opening therein, and a pair of cone ductive fingers supportedon, said member and having inner overlapping end portions, a nona what is:

Landscapes

  • Burglar Alarm Systems (AREA)

Description

June 20, 1950 A. w. WEST BURGLAR ALARM SWITCH Filed Jan. '28, 1.948
24 INSULAT/ A. al
Austin W. West INVEN TOR.
Patented June 20, 1 950 BURGLAR ALARM SWITCH Austin W. West, Dayton, Ohio Application January 28, 1948, Serial No. 4,777
, lClaim.
invention relates tofnew and useful ,im-
prov'ementsdn electrical switches and the priv ma object of the present invention isto pro vide a burglar alarm switch. th'e'r important object of the present invention is to'provide an electric switch mountable on a fixed structural element such as a door jamb, cabinet or the like which will be in a circuit-open position when the door, drawer or the like is in closed position and which will be actuated to a circuit-losing position as the door, drawer or the like is moved to an open position.
A further object of the present invention is to provide a burglar alarm switch that is extremely small and compact in structure and which may be quickly and readily applied to or removed from a structural element in a, convenient manner to operate efficiently and which will automatically sound an alarm when tampered with.
A still further aim of the present invention is to provide a burglar alarm switch that is simple and practical in construction, strong and reliable in use, neat and attractive in appearance, relatively inexpensive to manufacture, and otherwise well adapted for the purposes for which the same is intended.
Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:
Figure 1 is a fragmentary vertical sectional view of a abinet structure having a drawer which is disposed in a closed position, and showing the present switch in a circuit-open position applied to the same,
Figure 2 is a similar view of Figure 1 showing the drawer in an open position and the present switch in a circuit-closed position.
Referring now to the drawings in detail, wherein, for the purpose of illustration, there is disclosed a preferred embodiment of the present invention, the numeral Ill represents a substantially rectangular casing of any suitable conductive material having a guide opening I2 in its forward wall l4.
Secured by rivets or the like !5 and I8 to a pair of opposing walls of thecasing H1 is a pair of ang-ulated substantially V-shaped conductive fingers 2i! and 22 having their free ends 24 and 26 frictionally engaging each other in a normal position, and such overlapping ends 24 and 26 register opposite the guide opening l2.
Suitably fixed within the casing i0 is a nonccnductive support block 28 having a central guide opening or bore that aligns the guide opening l2 provided in the forward wall H of the casing l0.
Loosely positioned in. the guide opening 30 is a preferably steel coil spring 32 one end of which frictionally engages an annular detent 34 punched inwardly from the rear wall 36 of the casing 1B, and the other end of which frictionally embraces the reduced non-conductive stem portion 33 of a plunger 40 constructed of a nonconductive material. This plunger 40 is normally urged by the spring 32 into frictional engagement with the overlapped ends 24 and 26 of the conductive fingers 20 and 22.
The numeral 42 represents an annular base member which is recessed in and secured to the rear wall 44 of a movable structural element such as a cabinet or cash register drawer 46. A frusto-conical non-conductive element 48 rigidly carried by the base member projects outwardly from the rear wall 44 to extend through the guide opening l2 in the casing H).
In practical use of the present invention, the casing in isremovably secured to a fixed structural element 50 such as a cabinet structure and the rivets I6 and iii are connected in any suitable manner to a pair of circuit wires 52 and 54 which lead from a source of current and which are connected to a suitable alarm, either sound, visual or both.
When the drawer 46 is in a closed position, the frusto-conical element 43 extends through the guide opening [2 into the casing to force the plunger it into the opening 30 and the ends 24 and 26 of the contact fingers 2B and 22 in spread apart relation, as shown best in Figure l of the drawings. In this position, the circuit will be in an open position and the alarm will not emit a sound or be energized. As the drawer 46 is pulled to an open position, the frusto-conical element 45.; will disengage the free ends 24 and 26 of the conductive fingers 20 and 22 and the lunger 40, and the spring 32 will urge the free ends 24 and 26 of the conductive fingers into a circuit-closing position.
Obviously, the present switch is applicable for doors whereby the casing is applied to a door jamb and the element 48 applied to the door. Also, the present switch may be applied to any fixed structural element having a movable portion which will retain the element 48. It is further noted that the switch ould be applied to any structural element with a suitable pressure supplying object supporting the element 48 which will normally cause the switch to be open. When the pressure supplying object is removed from the switch or casing, the [circuit will be closed and the alarm sounded.
In view of the foregoing description taken in conjunction with the accompanying drawings, it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description isaccordingly deemed unnecessary.
It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention, thesa1ne., is susceptible to certain changes fully comprehended by the spirit of the invention, as. herein: described and within the scope of, the, appended claim.
Having described the invention, claimed as new is:
In a switch including; an insulated member having an. opening therein, and a pair of cone ductive fingers supportedon, said member and having inner overlapping end portions, a nona what is:
conductive plunger slidably received in said: opening,, a spring urging the plunger against the inner endportion of'one oi said fingers to, retain the inner end portions of said fingers in contact with each other, a casing for said member having REFERENCES CITED The following references are of record in thev me of this patent:
UNITED STATES PATENTS Number Name Date 296,812 Blake Apr. 15, 1884 504,980 Hall et. alt. a, Sept, L2,, L893 669,411 Yaxley et all, Mar. 5,, 1.90.1;
1,294,053 Cole c Feb. 11;..19191 2,047,328 c July 1.4, 1936; 2,33 554, 7 c. c- Oc 26,, 1184-3 2,443,;533 Dooley v June 15;, Iii-i8.v
US4777A 1948-01-28 1948-01-28 Burglar alarm switch Expired - Lifetime US2511955A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US4777A US2511955A (en) 1948-01-28 1948-01-28 Burglar alarm switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4777A US2511955A (en) 1948-01-28 1948-01-28 Burglar alarm switch

Publications (1)

Publication Number Publication Date
US2511955A true US2511955A (en) 1950-06-20

Family

ID=21712477

Family Applications (1)

Application Number Title Priority Date Filing Date
US4777A Expired - Lifetime US2511955A (en) 1948-01-28 1948-01-28 Burglar alarm switch

Country Status (1)

Country Link
US (1) US2511955A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708073A (en) * 1954-01-27 1955-05-10 Mohylowski Michal Combined key case and flashlight
US2710329A (en) * 1952-07-23 1955-06-07 United Carr Fastener Corp Electrical assembly
US3174006A (en) * 1962-04-30 1965-03-16 Frederick L Haake Missile umbilical ignition switch
US3264438A (en) * 1964-04-29 1966-08-02 Atlas Chem Ind Positive action circuit breaking switch
US3274363A (en) * 1962-10-08 1966-09-20 Atlas Chem Ind Electrical switch having deformable contact members
US3737591A (en) * 1971-10-27 1973-06-05 Alarm Products Int Inc Trap switch with elongated mounting wire for completing continuity circuit
US4181304A (en) * 1978-07-21 1980-01-01 Haber Terry M Illuminated dice and storage housing
US4507097A (en) * 1982-12-15 1985-03-26 Handi-Pac, Inc. Toy assembly
US4665285A (en) * 1984-10-04 1987-05-12 Nifco, Inc. Automobile door switch bumper
US4934753A (en) * 1988-10-05 1990-06-19 Ford Motor Company Electrical connectors for use with a retractable sunroof containing elements that respond to an applied electrical signal

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US296812A (en) * 1884-04-15 Selwyn
US504980A (en) * 1893-09-12 Electrical alarm system
US669471A (en) * 1899-09-22 1901-03-05 Victor Telephone Mfg Company Telephone-key.
US1294053A (en) * 1916-01-03 1919-02-11 Game Well Fire Alarm Telegraph Company Electric switch.
US2047328A (en) * 1933-05-02 1936-07-14 Arthur D Palmer Switch for burglar alarm systems
US2332554A (en) * 1940-10-03 1943-10-26 H A Douglas Mfg Co Electric switch
US2443533A (en) * 1946-06-25 1948-06-15 James J Dooley Window screen alarm

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US296812A (en) * 1884-04-15 Selwyn
US504980A (en) * 1893-09-12 Electrical alarm system
US669471A (en) * 1899-09-22 1901-03-05 Victor Telephone Mfg Company Telephone-key.
US1294053A (en) * 1916-01-03 1919-02-11 Game Well Fire Alarm Telegraph Company Electric switch.
US2047328A (en) * 1933-05-02 1936-07-14 Arthur D Palmer Switch for burglar alarm systems
US2332554A (en) * 1940-10-03 1943-10-26 H A Douglas Mfg Co Electric switch
US2443533A (en) * 1946-06-25 1948-06-15 James J Dooley Window screen alarm

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2710329A (en) * 1952-07-23 1955-06-07 United Carr Fastener Corp Electrical assembly
US2708073A (en) * 1954-01-27 1955-05-10 Mohylowski Michal Combined key case and flashlight
US3174006A (en) * 1962-04-30 1965-03-16 Frederick L Haake Missile umbilical ignition switch
US3274363A (en) * 1962-10-08 1966-09-20 Atlas Chem Ind Electrical switch having deformable contact members
US3264438A (en) * 1964-04-29 1966-08-02 Atlas Chem Ind Positive action circuit breaking switch
US3737591A (en) * 1971-10-27 1973-06-05 Alarm Products Int Inc Trap switch with elongated mounting wire for completing continuity circuit
US4181304A (en) * 1978-07-21 1980-01-01 Haber Terry M Illuminated dice and storage housing
US4507097A (en) * 1982-12-15 1985-03-26 Handi-Pac, Inc. Toy assembly
US4665285A (en) * 1984-10-04 1987-05-12 Nifco, Inc. Automobile door switch bumper
US4934753A (en) * 1988-10-05 1990-06-19 Ford Motor Company Electrical connectors for use with a retractable sunroof containing elements that respond to an applied electrical signal

Similar Documents

Publication Publication Date Title
US2511955A (en) Burglar alarm switch
KR860003939A (en) Accessories with built-in alarms in vehicles, especially anti-theft devices for car radios and recorders
US2298068A (en) Electromagnetic switch
US2471848A (en) Combined switch and fuse
US2897327A (en) Control-station
US2632071A (en) Relay
US2456038A (en) Portable fire alarm device
US2651689A (en) Door operated switch
US2734123A (en) gerber
US2437777A (en) Door open signal system
US2616972A (en) Telephone operated lighting means
US2448080A (en) Automatic light for cabinets
US2954512A (en) Electric switch circuit
GB829734A (en) Improvements in electric push-button switches
US3114905A (en) Alarm system
US2422847A (en) Automatic light control
US2634409A (en) Electric signaling device
US2525930A (en) Signal relay switch
US3710052A (en) Door latch operated switch unit
US1399170A (en) Burglar-alarm
US2620411A (en) Door hinge operated switch
US2463999A (en) Refrigerating apparatus
US1214920A (en) Electric switch.
US3172985A (en) Push button assembly
US2756299A (en) Radio cover switch