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Publication numberUS3866201 A
Publication typeGrant
Publication dateFeb 11, 1975
Filing dateNov 22, 1972
Priority dateNov 22, 1972
Publication numberUS 3866201 A, US 3866201A, US-A-3866201, US3866201 A, US3866201A
InventorsBeiswenger John L
Original AssigneeNat Presto Ind
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Security alarm device
US 3866201 A
Abstract
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 door-operated 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.
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United States Patent 1191 Beiswenger [451 Feb. 11,1975

[ SECURITY ALARM DEVICE [75] Inventor: John L. Beiswenger, Pacific Palisades, Calif.

[22] Filed: Nov. 22, 1972 [21] Appl. No.: 308,715

[52] U.S. Cl 340/274, 340/227.1, 200/61.62, 317/141 R [51] Int. Cl. G08b 13/08 [58] Field of Search 340/274, 275, 276, 227.1, 340/420, 309.1, 309.4; 200/6162, 61.64,

Powell et a1. 340/274 OTHER PUBLICATIONS G.E. Transistor Manual, 7th ed. (1968), page 320.

Primary Examiner-Donald J. Yusko Assistant Examiner-William M. Wannisky Attorney, Agent, or FirmJohnson, Dienner, Emerich & Wagner [57] ABSTRACT 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.

19 Claims, 11 Drawing Figures SECURITY ALARM DEVICE FIELD OF THE INVENTION 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.

DESCRIPTION OF THE PRIOR ART It is known to mount a self-contained battery operated alarm device on a door provided with a triggering lever which presses against the door trim when the door is closed and operates a switch to sound an alarm when the door is opened. It is also known to utilize means such as a timing motor or a thermally responsive relay in such alarm devices to delay sounding of the alarm for an interval long enough after opening of the door to permit personnel familiar with the alarm to reset it. Examples thereof are Callahan US. Pat. No. 3,266,029 and Callahan US Pat. No. 3,165,722. US. Pat. Nos. 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.

SUMMARY OF THE INVENTION In accordance with this invention 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. When the door opens, 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. Once initiated, the energized circuit continues to annunciate until disarmed by means of a second switch which is operated by means of a special key. In the alternate position of the disarming switch, the pulsating sound emitted by the speaker is halted; however, 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, therefore, 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.

Thus, a first and important feature of the invention is that 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.

In accordance with the invention, 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. Thus, 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.

A still further and important feature of the invention is that the alarm may be set either with the door closed or open. Thus, 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.

Many other objects, advantages and features of the invention will be at once apparent or will become so upon consideration of the description of a preferred embodiment of the invention which now will be described in connection with the accompanying drawings.

DESCRIPTION OF THE DRAWINGS Referring to said drawings,

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; and

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.

DESCRIPTION OF PREFERRED EMBODIMENT Referring now more particularly to the several views wherein like parts are designated by like reference characters, 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. A feature of the invention, as later detailed, is that 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. With switch 20 in its alternate position an opportunity is therefore presented to allow someone familiar with the device to reset the actuator 18 and prevent the alarm sounding in response to his opening the door. As afterwards more particularly described in connection with FIG. 11, 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.

Turning now to 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. One of the features of the invention is 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. Considering FIGS. 4 and 5 with FIG. 2, 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. Upon opening of the door, lever 14 is moved away from trim T allowing spring 48 to bias it forwardly into an acutely angled position against stop 50 as illustrated in FIG. 10. 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. As shown in FIG. 2 considered with FIG. 4, 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. 5, for example, 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. As illustrated by FIG. 6, when thus aligned, 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.

Considering now FIGS. 9 and 10 with FIGS. 4 and 5 and first to FIG. 4, it will be seen that 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, however, 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. 6 in which its projection 86 is moved out of the path of rod 54 allowing catch means represented by its hook end 66 to be slid inwardly of housing 46 to catch about first latch means 72 on depression of actuator 18 and be retained in said latched state through the biasing of spring 68 in cooperation with spring 62.

Considering now FIG. 7 with FIG. 6, with rod 54 latched as illustrated in FIG. 6, when door D is closed, lever 14 on engagement with the door trim T will be rotated to its FIG. 9 position against the biasing of spring 48 so that its portion 78 no longer applies a force on portion 76 of the latch sufficient to counter the bias of spring 80. Since spring 80 has an effective force greater than the resisting force of spring 68, in the absence of the counter force oflever 14, it causes projection 86 to displace rod 54 inwardly toward wall 13 to dislodge its hook end 66 from first catcher portion 72. The force of spring 62 on actuating arm 58 (FIG. 2) then reacts to pull rod 54 toward switch-40. I-Iowever, projection 86 of the latch has been moved under the force of 80 into the path of the rod 54 where it constitutes a second catcher or latch means with which hook end 66 of rod 54 catches as seen in FIG. 7. In this second latched position of the actuator 18 the switch engaging portion 60 of rod 54 is held out of engagement with switch plunger 64; and the alarm is not actuated by the closing of the door.

Referring now to FIG. 8, however, when door D is again reopened. spring 48 is again effective to return lever 14 to its FIG. 10 position in which position its portion 78 again acts on portion 78 of latch 74 causing latch 74 to rotate and raise its projection 86 (the second latch means) to dislodge catch 66, freeing rod 54 for movement into engagement with plunger 64 under the pull of spring 62. Thus, it will be appreciated that an occupant of the premises guarded by alarm device 10 comprising this invention can set the device through actuator 18 by latching its catch means 66 onto a first latch means represented by portion 72 while the door is open. He may then exit through the door, closing it behind him, the effect of which is to dislodge catch means 66 from portion 72 but causing it to be recaught on a second latch means represented by projection 86 of latch 74. Actuator 18 is thereby armed to be released when the door is reopened to close switch 40 and sound the alarm. In the event the occupant does not wish to leave the premises, as when retiring for the evening, he may depress the actuator 18 with the door closed. In this event, catchmeans 66 cannot catch with portion 72 (the first catcher) because of the presence of projection 86. However, catch means 66 will catch with the second catcher, projection 86 of latch 74, and is therefore ready to be dislodged when the door is next opened to close switch 40 and sound the alarm.

As previously mentioned, in accordance with this invention, 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.

Referring therefore now to FIG. 11, as there illustrated schematically, 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. The arrangement of 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.

Referring still to FIG. 11 and considering the disarming switch 30 to be in its armed position as illustrated by solid lines,-switch 40 when closed by the unlatching of actuator 18 in response to the movement of lever 14 on opening of door Dcompletes a control circuit comprising resistor R1 and capacitor C1 which are seriesconnected to a 6-volt DC power source 100. As shown in FIG. 2, 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. Thus starting with the plus side of the DC power source 100, 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. By reasons of the illustrated connection, 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. Thus, in one reduction of the invention to practice, C1 had a capacitance value of 500 microfarads at 6 volts DC. and a resistor selected for R1 had a resistance of 82 K ohms and introduced a time delay of about 7 seconds. Following said delay enforced by resistor R1, the rising charge on capacitor C1 discharges through transistor 01 to turn on relay 90 so that the output of the transistor O1 is fed through the actuated switch 104 to the base of transistor Q2 of the first pulse oscillator 90 which then continues to operate speaker coil 98, irrespective of the condition of switch 40. Speaker 98 therefore emits the previously described loud waving siren sound until interrupted by moving switch 30 to its alternate position as illustrated by phantom lines in FIG. 11. As previously described, 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.

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.

Referring again to FIG. 3, 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. However, when operator 28 is moved by key 24 to the left into its off position as illustrated by phantom lines, the green color portion 122 is moved behind cover 16 and is no longer visible through E-slot. Instead the red colored portion 124 of the indicator 120 becomes visible and advises the observer that the alarm annunciating circuit has been interrupted and cannot be started by closing switch 40. Indicator 120 thus constitutes a visual remainder as to the armed or unarmed state of the alarm device 10.

The invention also provides an audible reminder of the unarmed condition of the alarm device 10. Referring to FIG. 11, it will be seen that with 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.

Referring next to FIGS. 4 and 5, it will be seen that the aforediscussed biasing spring 80 for latch 74 actually comprises support for the center contact 124 of switch 120. Thus, as illustrated by FIG. 5, with lever 14 in the position it assumes with door D closed and it engaging door trim T, blade spring 80 is untensioned and contacts 124 and 126 of switch 120 are closed. When door D is opened, in the new position of lever 14, (FIG. 10) 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. Therefore, with switch 30 in its disarming position, as illustrated by phantom lines 114a, 113a, and 1070 in FIG. 11, whenever door D is opened, 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.

As previously mentioned, the alarm device of the present device also includes a fire sensing alarm operated by 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. 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.

From the above description of a preferred embodiment of the invention, it will be appreciated that the disclosed structure and illustrated circuitry provide a particularly useful combined fire and burglar alarm which is self-contained and capable of achieving all the recited objects, advantages and features of the invention. It will further more be appreciated that the invention is not to be considered limited to the exact disclosedarrangement of parts and illustrated circuitry,

but that many changes, rearrangements and variations in the described parts and particularly the illustrated circuitry can be utilized in achieving the recited objects and advantages, and features of the invention and are intended to be included within the scope of the appended claims as broadly set forth when considered in the light of existing prior art.

Therefore, having described my invention, I claim:

1. 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.

2. A security alarm device'as claimed in claim 1 wherein the 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.

3. 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.

4. 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.

5. A security alarm device as claimed in claim 4 wherein the 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.

6. 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.

7. A security alarm device as claimed in claim 5 wherein the 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.

8. A security alarm device as claimed in claim 4 further including a key-operated disarming switch for interrupting the alarm circuit.

9. 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.

10. 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.

11. 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.

12. A security alarm device as claimed in claim 11 wherein the 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.

13. 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 dislodge its catch means from the first catcher when the lever is rotated back out of its operating position as with closing of the door,'the projection of the second catcher being located to catch and hold the catch means of the actuator when thus released from the first catcher until the lever is again swung to its operating position with reopening of the door, the catch means of the actuator thereupon being dislodged to permit the actuator to return to its switch means operating position to actuate the alarm means.

14. A security alarm device as claimed in claim 13, wherein the circuit for the alarm means includes an energizable relay, a capacitor connected to the relay to energize the relay when charged, and a control circuit including said capacitor and the mentioned switch means which is normally open, said control circuit being adapted to charge the capacitor when the switch means is closed by the actuator.

15. A security alarm device as claimed in claim 14 wherein the 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.

16. A security alarm device as claimed in claim 15 wherein the circuit for the alarm means includes a disarming switch operable to interrupt the alarm once initiated bythe control circuit.

17. 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.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 5 866 201 Dated Ejgbn 1:] 197i Inventor(s) 0 J 4 er It is certified that error appears in the above-identified patent and that said Letters Patent are hereby-corrected as shown below:

Column LI, line IB, "plunger 62" should read --plunger 6LI- Column 5, line 26, After "hook" insert --shaped-- Column 5, line 55, "portion '78" should read --portion '76-- Column 6, line 1, After "latch" insert (Figure 7) In the Drawings:

lowermost l- P" of Figure A should be +5-- --82-- should be added to Figures 5-.-8

"76" should be deleted from Figure 9 -9 should be added to Figure 11 I Figures 4 a 11 should appear as shown on the attached sheet.

Signed and Scaled this thirteenth D a Of January 1 9 76 [SEAL] A tres t;-

RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner ofParents and Trademarks

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4123752 *Oct 4, 1976Oct 31, 1978Novotny Raymond JBurglar alarm
US4258358 *Aug 14, 1979Mar 24, 1981International Quartz Ltd.Door opening sensing and alarm producing device
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Classifications
U.S. Classification340/528, 200/61.62, 340/545.1, 361/196
International ClassificationG08B13/02, G08B13/08
Cooperative ClassificationG08B13/08
European ClassificationG08B13/08