US3866201A - Security alarm device - Google Patents

Security alarm device Download PDF

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Publication number
US3866201A
US3866201A US308715A US30871572A US3866201A US 3866201 A US3866201 A US 3866201A US 308715 A US308715 A US 308715A US 30871572 A US30871572 A US 30871572A US 3866201 A US3866201 A US 3866201A
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Prior art keywords
switch
door
alarm
actuator
circuit
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Expired - Lifetime
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US308715A
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English (en)
Inventor
John L Beiswenger
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National Presto Industries Inc
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National Presto Industries Inc
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Priority to US308715A priority Critical patent/US3866201A/en
Priority to GB5997572A priority patent/GB1406699A/en
Priority to AU50864/73A priority patent/AU476743B2/en
Priority to JP48023049A priority patent/JPS4984397A/ja
Application granted granted Critical
Publication of US3866201A publication Critical patent/US3866201A/en
Anticipated expiration legal-status Critical
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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

Definitions

  • a door-mounted security alarm device having an alarm which is differently annunciated by the closing of its fire sensing thermostat or one of its two dooroperated switches includes a manually settable actuator for closing one of the two switches in response to opening of the door, a key-operated disarming switch for disabling the response of the alarm once initiated by closing of said one door-operated switch, the alarm, however, remaining responsive to the thermostat and other door-operated switch.
  • the device also includes a further switch optionally settable to delay response of the alarm to closing of said one switch long enough to permit resetting the actuator before the alarm is annunciated.
  • the actuator is manually settable in either the open or closed condition of the door so that it actuates the one switch on reopening of the door.
  • This invention relates to security alarm devices and particularly to one useful to detect and annunciate movement of a movable member such as a door or the like.
  • 3,312,968 to Kiefer and 3,487,404 to Midkiff are examples of security alarm devices wherein a fire sensor or a thermostat is combined with a burglar alarm.
  • Other known patented alarms of general interest are Jezl US. Pat. No. 2,922,l50 and Pollak, et al, US Pat. No. 3,176,093.
  • a door mounted alarm includes a triggering lever which presses against the door trim when the door is closed and prevents the alarm from sounding.
  • the lever rotates forward to unlatch a previously manually set spring loaded actuator which closes a first switch.
  • This first switch completes a circuit including a capacitor which is charged through a resistor. The values of the resistor and capacitor are selected such that there is a predetermined delay before the capacitor starts to discharge. Discharge of the capacitor energizes a connected relay to initiate operation of a speaker circuit which annunciates a loud yelping or pulsating siren sound.
  • the energized circuit continues to annunciate until disarmed by means of a second switch which is operated by means of a special key.
  • a second control circuit is activated.
  • This second circuit includes a switch normally closed by the triggering lever of the alarm device each time the door is opened, causing the relay to produce a quiet buzz sound.
  • the alarm also includes a fire sensor or thermostat which remains connected to the speaker circuit in either position of the disarming switch and on sensing a predetermined temperature level closes to annunciate a steady sound which is readily distinguished from the yelping or pulsating siren sound set off by closing the first mentioned switch.
  • a principal object of the present invention is to provide an integral self-contained electrically operated alarm which is useful for monitoring an unauthorized opening of a door or other relative movement of an object or objects which includes controls operable for the benefit and convenience of authorized personnel.
  • Still another object of the invention is to provide such an alarm device which is simultaneously useful to detect the presence of a hazard such as fire.
  • a security alarm is so adapted that it may be optionally set to be immediately triggered by an unauthorized movement of the door or other member on which the device is mounted. Alternatively it may be set so that annunciation of the alarm is delayed long enough after the door has been opened to allow authorized personnel to reset the alarm before it goes off.
  • such means includes a switch which is manually actuatable to short or bypass a resistor in series with the capacitor.
  • the presence of the resistor delays its charging whereas shorting of the resistor eliminates the delay so that the capacitor charges rapidly and causes the alarm to sound immediately upon opening of the door.
  • a further feature of the invention is that in either optional setting of the alarm, once the alarm has gone off, it can be halted only by operating the disarming switch which requires a special key available only to authorized personnel.
  • Still another feature ofthe invention is that in the disarmed condition of the alarm, opening of the door causes the speaker to emit a quiet buzz sound which serves as a reminder that the burglar alarm has not been set.
  • a companion feature of the invention is that visual means are also associated with the disarming switch so that the condition of the alarm can be determined without opening the door.
  • the invention provides both a visual and an audible reminder when the burglar alarm is in its off condition and not set.
  • Still another feature of the invention is that the same speaker circuit is available to annunciate three distinctively different sounds, one of which indicates an unauthorized opening of the door, a second provides a remainder that the alarm has not been set and a third indicates the presence of fire.
  • the alarm may be set either with the door closed or open.
  • the alarm when the occupant does not intend to leave the premises he may set the alarm with the door closed and the alarm will go off on initial opening of the door. If the occupant plans to leave the premises after setting the alarm, he can do so with the door in its opened condition, then close the door behind him and the alarm will sound when the door is reopened. In this alternate, he can also set the alarm to delay annuciation of the alarm long enough when he returns and opens the door for him to reset the alarm and prevent its sounding.
  • a further important object of the invention is to provide a simple self-contained compact structure capable of obtaining all of the above recited objects, advantages and features of the invention.
  • FIG. 1 illustrates a security alarm device constructed in accordance with the invention and shown mounted on a door opposite its hinge edge and its operating lever located to sense the relationship of the door to the adjacent door frame trim;
  • FIG. 2 is a plan view of the security alarm device of FIG. 1 illustrated on a larger scale and with its cover removed to show component parts thereof;
  • FIG. 3 is a sectional view taken through the alarm device along lines 3-3 of FIG. 1 and illustrates the two positions of the disarming switch operator and the actuating key therefor;
  • FIG. 4 is a plan view of the door actuated lever as well as the two switches which it operates and the mechanism through which said lever operates said switches;
  • FIG. 5 is a sectional view taken along lines 5-5 of FIG. 4 and shows further details in the construction and operation of said mechanism by the door actuated lever; 7
  • FIGS. 6, 7 and 8 are views generally similar to FIG. 5 and illustrate various positions to which said mechanism is moved to operate the switches with opening and closing of the door on which the invention is mounted;
  • FIG. 9 is a sectional view taken along lines 99 of FIG. 4, the door actuated lever being illustrated in the position it assumes when engaging the door trim with the door closed;
  • FIG. 10 is a view generally similar to FIG. 9 showing the mechanism operated by the door actuated lever moved to an alternate position, as when the door is open and the lever is out of engagement with the door trim;
  • FIG. 11 is a schematic diagram of the electrical circuits including the components comprising a typical alarm annunciating circuit in accordance with the invention and the switch-operated control circuits therefor.
  • FIG. 1 illustrates the invention embodied in a combined fire and burglar alarm device 10.
  • Said device comprises a rectangular case 12 shown mounted in the upper right hand corner of a door D along the side edge thereof opposite the hinged side edge of the door and includes an operating lever or sensor 14 located to engage the adjacent door frame or trim T when the door is closed within said frame.
  • Bottom wall 13 of case 12 may be secured to door D by any suitable means such as screws, adhesive or adhesived elements and the interior of the case is closed by a removable cover 16.
  • Reference numeral 18 identifies the externally projecting end of an actuator which is manually depressed to set the alarm device to sound a characteristic pulsating or yelping siren sound when the door is later opened and its trim engaging lever 14 moved away from the door trim T.
  • the actuator 18 may be set with the door either closed or opened.
  • 20 indicates a twoposition switch. In one of its two positions the alarm device is set by actuator 18 so that the alarm device 10 will sound immediately upon opening of door D. In its alternate position the alarm device after being set by actuator 18 will sound only following a time delay of several seconds after the door has been opened.
  • the annunciating circuit is of the type which once initiated continues to sound until the circuit is interrupted.
  • 22 indicates an E-shaped slot provided in cover 16 through which a special key 24 (FIG. 3) may be inserted.
  • Said key is provided with spaced upturned portions 26 so that when inserted through slot 22 it can engage about operator 28 of the annunciating circuit disarming switch 30 to actuate the switch as by shifting the key to the left of FIG. 3 and thereby interrupt the annunciating circuit once it has been initiated.
  • 32 represents a heat sensitive thermostaticswitch which is so connected into the alarm circuit as afterwards described to operate the alarm when it senses a temperature rise beyond a predetermined value, for example 130F, indicative of a nearby fire.
  • FIG. 2 40 represents a normally open switch which is closed to initiate sounding of the alarm device as when door D is opened by unauthorized personnel.
  • the actuator 18 which may be latched in position to be dislodged by lever 14 when the door D is open to close switch 40 and set off the alarm.
  • lever 14 is shown pivotally mounted on pintle 42 supported between spaced legs or uprights 44, 45 of a housing 46 secured to the base wall 13 of case 12.
  • Lever I4 is shown biased by spring 48 so that it firmly engages door trim T and assumes a more or less parallel relation to the casing wall 13 as illustrated by FIG.-9.
  • Actuator 18 is shown in FIG. 2 as comprising an operating arm 58 pivotally connected at 56 to one end of an actuator rod 54.
  • Rod 54 extends through a rectangular shaped opening 52 in leg 45 and under the actuation of operating arm 58 is slidable within housing 46 in directions generally parallel to pintle 42, that is at right angles to the rotatable movement of lever 14.
  • the connected end of rod 54 includes an enlarged portion 60 which engages plunger 62 of switch 40 under the bias of spring 62 to effect closing of switch 40.
  • Rectangular opening 52 is illustrated as having a width approximating that of rod 54 and a depth several times the depth of said rod. Opening 52 therefore effectively confines the reciprocal movement of rod 54 to the aforementioned parallel relationship to pintle 42 while also permitting it to be displaced toward the base wall 13 of the alarm case 12 for a reason afterwards made clear.
  • the opposite end of rod 54 located within the housing 46 comprises catch means 66 shaped in the form of a hook or a projection which under the biasing of cantilever mounted leaf spring 68 is urged in a direction away from the bottom wall 13 of the case and toward the top wall of housing 46. As illustrated in FIG.
  • the top wall 47 of housing 46 includes an opening 70 with which catch means 66 aligns when rod 54 is slid inwardly of the housing in response to manual depression of actuator arm 58 against the resistance of spring 62.
  • spring 68 urges catch 66 into said opening 70 so that in cooperation with action of spring 62 it latches about a first catcher or latch means embodying portion 72 of the housing top wall, the actuator being thus held in the latched condition illustrated by FIG. 6 with its end portion 60 out of engagement with plunger 64.
  • Switch 40 is therefore open.
  • pintle 42 also provides rotatable support for a latch 74 which operates within a provided cut out in the sensor lever 14. As illustrated, a portion 76 of the latch underlies a portion 78 of the lever 14 so that latch 74 swings with lever 14 about pintle 42 under the biasing of the aforementioned spring 48.
  • Cantilever mounted on the outer side of housing wall 47 is a second leaf spring 80 having its free end overlying and engaging a projection 82 on the outer side of the forwardly projecting portion 84 of the latch 74.
  • Spring 80 is biased in the direction of the bottom wall 13 of the alarm case and is effective to urge projection 86 on the inner side of portion 84 of the latch into the path of rod 54 in opposition to the weaker force of spring 68.
  • the biasing force of spring 48 on lever 14 exceeds the counter biasing force of spring 80 on latch 74.
  • Lever 14 therefore, when moved to its alternate position illustrated in FIG. 10 by the opening of door D, acts on latch 74 through its portion 78 to rotate the latch to its raised position illustrated by FIG.
  • the alarm device can be set by actuator 18 so that a siren alarm will be sounded immediately upon opening of the door and the alarm will continue until shut off by actuation of disarming switch 30.
  • the alarm device may also be set by actuator 18 when switch 20 is in its alternate position so that when the door is opened a short interval of time will elapse between the closing of switch 40 and the actual sounding of the alarm.
  • This enforced time delay allows the occupant and/or other personnel familiar with the device on returning to the premises and opening door D to depress actuator 18 so as to relatch catch means 66 on catch 72 prior to initiation of the alarm and therefore prevent its sounding. It will be appreciated, however, that unless the disarming switch 30 is actuated, when the door is next reopened, the alarm will sound after the enforced time delay.
  • an alarm annunciating circuit useful with the present invention comprises a pulse oscillator 92 including transistors Q2, Q3 and the associated resistors and capacitors which are arranged so that transistor Q3 continues to deliver a pulsing signal to a second oscillator 94 once oscillator 92 is energized by relay 90.
  • Second oscillator 94 comprises the further transistors Q4, Q5 and 06 which are connected to each other as shown and arranged with associated resistors and capacitors to feed a signal to coil 98 of the speaker 96, the emitted siren sound being modified. by the pulsing signal received from the first oscillator 92 such that the speaker emits a wavering or yelping siren sound.
  • capacitor C2 through C4, resistors R4 through R12 and hook up of the transistors Q1 through O6 is clear from FIG. 11 and the function of the individual components and their illustrated arrangements including diodes CR1, CR2 and CR3 will be apparent to those of ordinary skill in the art as capable of performing the results above set forth wherefore the alarm annunciating circuit comprising said oscillators and speaker coil will not be further described.
  • control circuit comprising resistor R1 and capacitor C1 which are seriesconnected to a 6-volt DC power source 100.
  • power source 100 may comprise four 1.5 volts DC dry cell batteries (two of which are shown) series-mounted within a suitable holder 102 and connected into the control circuit and the alarm annunciating circuit as illustrated by FIG, 11.
  • the control circuit operated by switch 40 may be traced following lines 104, 105 to capacitor C1, line 106 through element 107 of switch 30, and lines 108, 109 and 110 to switch 40, then line 111 to resistor R1, then line 112 through elements 113 and 114 of switch 30 through lines 115 and 116 to the minus side of the power supply.
  • closing of switch 40 causes capacitor C1 to charge.
  • Resistor R1 being in series therewith, resists charging of the capacitor C2 for a predetermined time with is a function of the related values ofRl and C2.
  • C1 had a capacitance value of 500 microfarads at 6 volts DC.
  • the 7 second delay incurred in initially charging capacitor C1 enforced by resistor R1 allows authorized personnel time, after opening door D, to reset actuator 18 and so prevent further charging of the capacitor C1 wherefore relay 90 does not energize and the alarm annunciating circuit comprising the aforementioned oscillators 92 and 94 is not actuated.
  • actuating switch 20 In the event it is desired not to enforce the 7 second time delay, as for example should the occupant want to set the alarm but not leave the premises, he can do so by actuating switch 20 to its alternate position illustrated by phantom lines in FIG. 11. In this position actuating switch 20 provides the bypass for shorting out resistor R1, allowing capacitor C1 to rapidly charge upon closing of switch 40. In this event relay 90 is im mediately energized and the speaker sounds immediately following opening of door D and its operation of lever 14 to close switch 40.
  • an indicator 120 is shown in association with operator 28 for the disarming switch 30.
  • Said indicator 120 has a green-colored portion 122 visible through slot 22 as also illustrated in FIG. 1.
  • the green color visible through E-slot 22 advises the observer that switch is in its armed state. This is to say that switch 30 occupies its full line position as illustrated in FIG. 11 so that when switch is closed the alarm annunciating circuit can be actuated.
  • Indicator 120 is also provided with a red colored portion 124 which in FIG. 3 is shown hidden behind cover 16 and not visible through the E-slot.
  • the invention also provides an audible reminder of the unarmed condition of the alarm device 10.
  • switch 30 moved to its alternate position illustrated by phantom lines wherein its elements 107, 113 and 114 occupy positions identified at 107a, 113a, and 114a, respectively, not only is the annunciating alarm circuit interrupted so that it cannot be initiated by the charging of capacitor C1 to energize relay 90, but relay is now connected to the power source when contacts 125 and 124 of switch are closed. In this closed condition of switch 120, the connectedcircuitry causes relay 90 to function in the manner of a conventional buzzer.
  • the aforediscussed biasing spring 80 for latch 74 actually comprises support for the center contact 124 of switch 120.
  • blade spring 80 is untensioned and contacts 124 and 126 of switch 120 are closed.
  • latch 74 has been rotated to its position illustrated by FIGS. 6 and 8 wherein spring 80 has been tensioned to close contacts 124 and and interrupt the previous closed condition of contact 124 with contact 126.
  • relay 90 is caused to emit a low quiet buzz sound which serves to alert the occupants of the premises that the door D has been opened. This buzz sound will continue for about 15 seconds or less since it utilizes the same time delay circuit above described for the alarm, C1, however. discharging rather than charging through the illustrated closed contacts 104 of relay 90. It is therefore available as an audible reminder to the occupant on leaving the premises that the unauthorized entry alarm has not been set. It also serves as an indicator whenever the door is left ajar and not securely latched.
  • the alarm device of the present device also includes a fire sensing alarm operated by a normally open thermostatic switch 32.
  • a normally open thermostatic switch 32 As illustrated by FIG. 11, one side of the thermostatic switch 32 is connected by line 116 directly to one side of the power source 100 and bypassing disarming switch 30. The other side of the thermostatic switch 32 connects via line 118 to point 128 of the alarm annunciating circuit so that it bypasses the pulse oscillator 92 and eliminates the action thereof.
  • thermostatic switch 32 When thermostatic switch 32 closes in response to its sensing a temperature above the aforementioned 130 F, it connects point 128 with power source 100 to initiate operation of oscillator 94 and causes speaker 96 to emit a steady siren sound which differentially distinguishes from the wavering siren sound emitted by the speaker when switch 40 is closed with switch 30 in its arming position. In this instance, the steady siren sound indicative of fire, or at least excessive heat in the immediate area, also continues until the power source 100 is exhausted or the thermostat cools to about 90 F, but unlike the wavering siren sound produced by closing switch 40, it cannot be shut off, interrupted or inhibited by switch 30 in either of its two positions.
  • a security alarm device mountable on a door and including a tripping lever sensitive to the movement of a door relative to a stationary door frame to detect opening and closing of the door, the device comprising an annunciating alarm circuit, a control circuit including a normally open switch closeable to actuate the annunciating alarm circuit, a manually retractable actuator spring-biased toward an operating position where it closes the switch, and first and second latch means for releasably holding said actuator in retracted positions remote from said operating position, said latch means being operatively associated with the tripping lever so as to release the actuator from the first latch means when the lever senses the door has closed and to release the actuator to said switch operating position from the second latch means when the door re-opens.
  • control circuit also includes time delay means which delay actuating the annunciating alarm circuit for a short interval of time after the switch is closed, said time delay providing an opportunity for retracting the actuator from its operating position to reopen the switch before the annunciating alarm circuit is energized.
  • a security alarm device as claimed in claim 2 having means manually operable to by-pass said time delay means so that the annunciating alarm circuit is immediately energized on closing of the switch.
  • a security alarm device as claimed in claim 1 which further includes an actuating relay for the annunciating alarm circuit and wherein the control circuit includes a capacitor which is charged on closing of the switch to energize the relay and actuate the annunciating alarm circuit.
  • control circuit further includes means for delaying the charging of the capacitor upon release of the actuator to its operating position to close the switch.
  • a security alarm device as claimed in claim 5 wherein the means for delaying the charging of the capacitor comprises a resistor in series with the capacitor, the control circuit also including a manually operable switch for by-passing the resistor to permit rapid charging of the capacitor and immediate actuation of the alarm circuit on closing of the first-mentioned normally open switch.
  • control circuit further includes manually operable by-pass means for said capacitor-chargingdelay means which when operated permit the alarm circuit to be actuated immediately upon closing of the control circuit switch.
  • a security alarm device as claimed in claim 4 further including a key-operated disarming switch for interrupting the alarm circuit.
  • a security alarm device as claimed in claim 8 including a further switch positioned to be closed by the tripping lever whenever it senses the door is open, said switch comprising a circuit coupled to the relay by the disarming switch when it is positioned to interrupt the alarm circuit, the coupled relay causing a buzzing sound to be emitted when the further switch is closed.
  • a security alarm device as claimed in claim 8 which further includes indicia means actuated by the disarming switch when in its alarm circuit interrupting position.
  • a security alarm device as claimed in claim 1 which also includes a normally open thermostatic switch connected to the alarm circuit to annunciate the same when closed.
  • thermostatic switch is so coupled to the alarm circuit that it annunciates differently when the thermostatic switch closes that when it is actuated by the relay.
  • a security alarm device mountable on a door to announce the opening thereof, the device comprising alarm means, an actuatable circuit therefor, switch means for actuating the circuit, a spring-biased retractable actuator for operating said switch means, and a rotatably-mounted, spring-biased detecting lever which engages the door frame when the door is closed and is biased to an operating position when the door is opened, a first catcher spaced from the switch means and overlying the actuator, the actuator having catch means to catch with the first catcher when the actuator is retracted from engagement with the switch means, a second catcher disposed between said first catcher and the switch means, said second catcher being springbiased toward the actuator and including a projection past which the catch means of the actuator moves when retracted to catch with the first catcher, the detecting lever including a portion which overrides a portion of said second catcher to hold the projection thereof spaced above the actuator when the lever is springbiased to its operating position, and spring means biasing the second catcher toward the actuator to dislod
  • control circuit also includes a resistor in series with the capacitor to delay its charging as when the switch means is initially closed with reopening of the door, and a manually operated second switch for shorting said resistor to permit rapid charging of the capacitor and thereby immediate actuation of the alarm means upon opening of the door.
  • a security alarm device as claimed in claim 16 comprising a further-circuit including a fourth switchclosed by the detecting lever in its operating position, said further circuit including buzzer means energized by the closing of said fourth switch, said further circuit being activated by the disarming switch when operated wherein the disarming switch is key-actuated.

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  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
US308715A 1972-11-22 1972-11-22 Security alarm device Expired - Lifetime US3866201A (en)

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Application Number Priority Date Filing Date Title
US308715A US3866201A (en) 1972-11-22 1972-11-22 Security alarm device
GB5997572A GB1406699A (en) 1972-11-22 1972-12-29 Security alarm devices
AU50864/73A AU476743B2 (en) 1972-11-22 1973-01-08 Security alarm device
JP48023049A JPS4984397A (OSRAM) 1972-11-22 1973-02-26

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US308715A US3866201A (en) 1972-11-22 1972-11-22 Security alarm device

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AU (1) AU476743B2 (OSRAM)
GB (1) GB1406699A (OSRAM)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123752A (en) * 1976-10-04 1978-10-31 Novotny Raymond J Burglar alarm
EP0012155A1 (en) * 1978-08-16 1980-06-25 International Quartz Ltd. Intruder alarm device
US4465997A (en) * 1981-01-26 1984-08-14 Security Network International, Inc. Exterior mounted door and window alarm switch
US4559527A (en) * 1982-09-29 1985-12-17 Kirby Brian T Dual mode electronic intrusion or burglar alarm system
US4910497A (en) * 1988-07-11 1990-03-20 Seachris Harlan E Closure alarm for containment chambers for dangerous materials
US20010030605A1 (en) * 2000-04-07 2001-10-18 Novotny Raymond J. Burglar alarm and door chime
US20130015049A1 (en) * 2011-07-12 2013-01-17 Tengler Adrian J Electrical switch with shear force contact weld release
CN114876013A (zh) * 2022-04-17 2022-08-09 百安消防科技有限公司 一种内置撞击警报的智能防撞消火栓

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
US4151520A (en) * 1977-07-25 1979-04-24 Full Elliott D Portable self-contained alarm with remote triggering capability
GB8320713D0 (en) * 1983-08-01 1983-09-01 Valier Grossman M Audio warning system for door/window
CN112355475B (zh) * 2020-11-11 2022-12-13 北京石油化工学院 集成多种传感器水下激光增材排水装置

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US2922150A (en) * 1957-04-19 1960-01-19 Jezl Anton Door alarm
US3266029A (en) * 1964-04-30 1966-08-09 F & C Entpr Inc Burglar alarm system having a delayed alarm
US3312968A (en) * 1964-11-05 1967-04-04 Jr Russell A Kiefer Unitized combination burglar-fire alarm device
US3453613A (en) * 1966-01-24 1969-07-01 Murray Kay Burglar alarm
US3531793A (en) * 1967-06-13 1970-09-29 Richard Shottenfeld Burglar alarm system
US3623088A (en) * 1969-07-22 1971-11-23 Peterson Design Co Inc Alarm system with manually selectable time delay
US3641571A (en) * 1969-09-15 1972-02-08 Irwin I Kitman Combination burglar and fire alarm
US3714643A (en) * 1971-03-11 1973-01-30 F Sosin Combined lock and alarm
US3768086A (en) * 1971-11-22 1973-10-23 Norris Industries Alarm attachable to a door

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Publication number Priority date Publication date Assignee Title
US2922150A (en) * 1957-04-19 1960-01-19 Jezl Anton Door alarm
US3266029A (en) * 1964-04-30 1966-08-09 F & C Entpr Inc Burglar alarm system having a delayed alarm
US3312968A (en) * 1964-11-05 1967-04-04 Jr Russell A Kiefer Unitized combination burglar-fire alarm device
US3453613A (en) * 1966-01-24 1969-07-01 Murray Kay Burglar alarm
US3531793A (en) * 1967-06-13 1970-09-29 Richard Shottenfeld Burglar alarm system
US3623088A (en) * 1969-07-22 1971-11-23 Peterson Design Co Inc Alarm system with manually selectable time delay
US3641571A (en) * 1969-09-15 1972-02-08 Irwin I Kitman Combination burglar and fire alarm
US3714643A (en) * 1971-03-11 1973-01-30 F Sosin Combined lock and alarm
US3768086A (en) * 1971-11-22 1973-10-23 Norris Industries Alarm attachable to a door

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123752A (en) * 1976-10-04 1978-10-31 Novotny Raymond J Burglar alarm
EP0012155A1 (en) * 1978-08-16 1980-06-25 International Quartz Ltd. Intruder alarm device
US4258358A (en) * 1978-08-16 1981-03-24 International Quartz Ltd. Door opening sensing and alarm producing device
US4465997A (en) * 1981-01-26 1984-08-14 Security Network International, Inc. Exterior mounted door and window alarm switch
US4559527A (en) * 1982-09-29 1985-12-17 Kirby Brian T Dual mode electronic intrusion or burglar alarm system
US4910497A (en) * 1988-07-11 1990-03-20 Seachris Harlan E Closure alarm for containment chambers for dangerous materials
US20010030605A1 (en) * 2000-04-07 2001-10-18 Novotny Raymond J. Burglar alarm and door chime
US6906626B2 (en) * 2000-04-07 2005-06-14 Raymond J. Novotny Burglar alarm and door chime
US20130015049A1 (en) * 2011-07-12 2013-01-17 Tengler Adrian J Electrical switch with shear force contact weld release
US8853582B2 (en) * 2011-07-12 2014-10-07 Illinois Tool Works Inc. Electrical switch with shear force contact weld release
CN114876013A (zh) * 2022-04-17 2022-08-09 百安消防科技有限公司 一种内置撞击警报的智能防撞消火栓

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Publication number Publication date
AU5086473A (en) 1974-07-11
JPS4984397A (OSRAM) 1974-08-13
GB1406699A (en) 1975-09-17
AU476743B2 (en) 1976-09-30

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