US3810145A

US3810145A - Door bolt with electric alarm

Info

Publication number: US3810145A
Application number: US00301589A
Authority: US
Inventors: V Gusaras
Original assignee: Oak Industries Inc
Current assignee: Oak Industries Inc
Priority date: 1972-10-27
Filing date: 1972-10-27
Publication date: 1974-05-07
Anticipated expiration: 1991-05-07

Abstract

A door bolt with an electric alarm provides an alarm indication after a door bolt has been placed in the locked position and an intruder either severs the bolt, forces the door open or applies great force against the door.

Description

I United States Patent 1191 1111 3,810,145 Gusaras May 7, 1974 [54] DOOR BOLT WITH ELECTRIC ALARM 3,623,062 11/1971 Hawkins 340/274 3,263,040 7/1966 Bliven 340/274 X [75] Inventor: Vlad Gusaras, Madlson, 2,521,005 9/1950 Gundlach 340/274 ux 73 Assignee; O Industries, Inc Crystal Lake, 2,725,437 11/1955 Fields et al. ZOO/61.67

Ill.

Primary Examiner-John W. Caldwell [22] Flled' 1972 Assistant ExaminerWilliam M. Wannisky [2]] Appl. No.: 301,589 Attorney, Agent, or Firml(inzer, Plyer, Dorn &

, McEachran [52] US. Cl 340/274, 70/DIG. 49, ZOO/61.67 [51] Int. Cl E05!) 45/12 57 ABSTRACT [58] Field of Search 340/274, 276; 70/129, 434,

70/438, DIG. 4O 49 7 200/6157, A door bolt w1th an electrlc alarm provldes an alarm 6168 6193 indication after a door bolt has been placed in the locked position and an intruder either severs the bolt, [56] References Cited forces the door open or applies great force against the v UNITED STATES PATENTS 3,727,210 4/1973 Hawkins 340/274 14 Claims, 18 Drawing Figures PATENTEDMAY 7 1974 SHEET 1 [1F 4 minnow 71914 3.810.145

DOOR BOLT WITH ELECTRIC ALARM SUMMARY OF THE INVENTION This invention is in the field of alarm devices and is for use in such places as homes, apartments, motels, and hotels.

A primary object is a door bolt with an electric alarm that provides an alarm indication when an intruder tampers with a secured door bolt.

Another object is an alarm device that has an indicator such as a lamp so that the operator of the device can tell when the device is in its operating mode.

Another object is an alarm device that will provide an alarm when the door bolt is severed, forced open, or when a large force is applied to the door. Another object is an alarm device that gives an alarm indication only when an intruder tampers with the locked door bolt.

Other objects will appear from time to time in the ensuing specification, drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of one embodiment of a door bolt with an electric alarm;

FIG. 2 is a sectional view along line 22 of FIG. 1;

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a schematic diagram of the electric alarm circuit of the device;

FIG. 5 is a front view of an alternate form of the alarm device;

FIG. 6 is a top view of FIG. 5 with parts broken away;

FIG. 7 is a top view of the device shown in FIG. 5

. with the door bolt in a different position;

FIG. 8 is an electrical circuit diagram of the alarm circuit of the device shown in FIGS. 5, 6, and 7;

FIG. 9 is a front view of another alternate form of the device with the bolt in an unlocked position;

FIG. 10 is the same as FIG. 9, except that the bolt is now in the locked position;

FIG. 11 is a front view of the housing shown in FIG. 9 with the door bolt removed;

FIG. 12 is a sectional view along line 12--12 of FIG. 11;

FIG. 13 is a partial view of the bolt of FIGS. 9 and 10 with the cam portion shown in detail;

FIG. 14 is a sectional view along line 14-14 of FIG. 13;

FIG. 15 is a sectional view along line 15-15 of FIG. 10;

FIG. 16 is a side view of FIG. 9 with parts broken away with the bolt in an unlocked position;

FIG. 17 is a side view of FIG. 10 with parts broken away with the bolt in a locked position; and

FIG. 18 is an electrical circuit diagram of the alarm circuit of the device shown in FIGS. 9 through 17.

DESCRIPTION OF THE PREFERRED EMBODIMENT Three forms of the door bolt and alarm device will be described, although the invention should not be limited to the precise structures shown. The various structures shown in FIGS. 1 through 18 include a door bolt, a door bolt housing, and an alarm and detector means.

The alarm and detector means each include two detector switches, an alarm device, and a power source.

The door bolt with electric alarm device in FIGS. 1

through 4 includes a door bolt housing 10 which is mounted on the door, an alarm and detector means 12 mounted to the door jamb or wall adjacent to the door and a door bolt 14 that travels in the door bolt housing 10 and extends into the alarm and detector means 12. The door bolt 14 is shown in FIGS. 1, 2 and 3 in its locked position in the door bolt housing 10.

The door bolt housing 10 is mounted to the door by fasteners 16 such as screws or the like, in the same position as a standard door bolt. The housing 10 has a channel 18, rectangular in shape except for two

elongated locking grooves

20 and 22, located at the far edges of the bolt channel. The door bolt 14, a generally straight rod, has a handle 24 which slides in the bolt channel 18.

The alarm and detector means 12 includes a housing 26 which is mounted by appropriate fasteners 30 such as screws. The door bolt 14 enters the housing 26 through an opening 32. Mounted in the alarm detector means housing 26 are a buzzer alarm device 34, an operating mode indicator lamp 36, a detector switch 38, and an intruder switch 40 that also is an alarm actuator,-and a battery power source 42. Although the alarm device is shown as a buzzer, it should be understood that various other alarm means are equally satisfactory.

The connections of these elements are shown in the electrical circuit diagram FIG. 4. The battery power source 42 may be a nine volt transistor" battery and is connected to the operating indicator lamp 36 through detector switch 38. The buzzer alarm device 34 is connected to the battery power source 42 through detector switch 38 and intruder switch 40.

The contacts of the detector switch 38 are normally open while the contacts of the intruder switch 40 are normally closed. When the door bolt 14 is in the unlocked position, the end 44 of the door bolt does not extend far enough into the housing 26 to engage the switch actuator button 46 of the detector switch 38 or the actuating arm 48 of the intruder switch 40. In this position the switches will be in their normal contact modes with detector switch 38 open and intruder switch 40 closed. The alarm circuit will then be in the condition shown in FIG. 4. Neither the operating indicator lamp 36 nor the buzzer alarm device 34 will be operated.

As the bolt handle 24 of the door bolt 14 travels from its unlocked position at elongated groove 20 at the right side of the bolt channel 18 to the elongated groove 22 on the left side of the bolt channel, the door bolt 14 moves to the left and enters opening 32 of the housing 26. The door bolt 14 will contact the actuating arm 48 of switch 40 at roller wheel 50 attached to the actuating arm before contacting the switch button 46 of switch 38. At this point the switch contacts of switch 40 will open while the contacts of switch 38 will remain open. As the door bolt is pushed farther to the left and the door bolt handle 24 enters the left side of elongated groove 22, the end of the door bolt 44 will contact switch button 46. The contacts of switch 38 will now close, and will remain closed due to the latching design of the switch, lighting lamp 36. This indicates that the alarm device is now in operation. Since the door bolt 14 is still actuating the intruder switch 40 through roller 50 and actuating arm 48, its switch contacts remain open.

When the bolt handle 24 enters the left side of the elongated groove 22, the spring 52 of detector switch 38 is compressed as the end 44 of door bolt 14 depresses switch button 46. As the operator releases the bolt handle 24, spring 52 of switch 38 pushes the door bolt 14 and attached bolt handle 24 from the left side of elongated groove 22, where the bolt handle first entered the groove, to the right side of groove 22. The

switch button 46 is released with its switch contacts not being opened until the bolt handle 24 is unlocked by again moving it to the left of groove 22 in order to re-enter the bolt channel 18. The dimensions of the elongated groove are such that the bolt handle 24 must enter the groove 22 at its left side to clear extension 28 of groove 22. Due to extension 28 of elongated groove 22, the groove 22 is wider at its bottom than at its top where the bolt handle 24 first enters the groove.

If an intruder applies force to the door, the door bolt 14 will move in opening 32 toward the wall 52 in FIG. 2. The detector switch 38 will remain actuated because it is latched. However, the door bolt 14 will move away from roller wheel 50, allowing actuating arm 48 to move downward in FIG. 1 such that the intruder switch is returned to its normal closed position. Since the contacts of switch 38 are closed and those of intruder switch 40 are also closed, the battery 42 delivers power to the buzzer alarm device 34 alerting the occupants to the presence of the intruder.

Similarly, if an intruder seversthe bolt in order to obtain entry, the door bolt 14 will fall downward in the opening 32, the detector switch 38 remaining latched with closed contacts, but deactuating the intruder switch 40. The contacts, of intruder switch 40 are closed as roller wheel 50 is no longer in contact with the door bolt 14 and allows the actuating arm 48 to return to its normal position.

The structure shown in FIGS. 5, 6, 7, and 8 includes a door bolt housing 110, a door bolt 112 and detector means 114 for determining the position of the door bolt 112. The alarm means and the operating indicator lamp may be similar to that shown in FIGS. 1-4 and will not be discussed in detail. The battery 42, the buzzer 34, and the operating indicator lamp 36 are shown in the electrical circuit diagram FIG. 8.

The door bolt housing 110, which is fastened to the door by means of appropriate fasteners 116 has a bolt channel 118 with elongated locking groove 120 for the bolt handle 122. The door bolt housing 110 provides support for the door bolt 112 which slides in the door bolt housing as the door bolt handle 122 is moved in the bolt channel 118.

The door bolt 112 is thicker than that shown in FIGS. 1-4 and includes a thin, rod-like extension, or bolt neck 130 at the end of the door bolt which enters the detector means 114. A bolt sleeve 132 is mounted on the bolt neck 130 by means of a passage drilled through the center of the bolt sleeve 132. A spring 134 is placed over the bolt neck 130 in the passage of the bolt sleeve between the washer 138 and the walls of the passageway at 136. The spring 134 is selected to provide a small amount of tension to hold the bolt sleeve 132 against the door bolt 112 where the bolt originates.

The detector means 114 includes a detector switch 150, an intruder switch 152 and a detector housing 154 that supports the switches and 152 and is fastened to the wall or door jamb adjacent the door.'The detector switch 150 is mounted to the housing 154 by a bracket 156 and screws 158. The intruder switch 152 is mounted to the housing 154 by a bracket 160 and screws 162.

The detector switch 150 has normally open contacts when its actuator arm 164 has no force applied to it, allowing the actuator button 166 to be in its extended or upward position. When force is applied against the actuator arm 164 depressing the actuator button 166, the contacts of the detector switch 150 are closed.

The contacts of intruder switch 152 are also normally open when no force is applied to actuating arm 168 such as not to depress actuator button 170. When force is applied to the actuating arm 168, the actuator button 170 is depressed and the contacts are closed.

The

switches

150 and 152 are connected to the battery 42, the operating indicator lamp 36 and the buzzer 34 by appropriate wiring means to form the electrical circuit shown in FIG. 8. The battery 42 is connected through detector switch 150 to the operating indicator lamp 36. The buzzer 34 is connected to the battery 42 through detector switch 150 and intruder switch 152.

The detector housing 154 includes a jam housing cam 172 where the bolt sleeve 132 enters the housing 154. The jam housing cam 172 is a circular hole in the.

detector housing 154 with a beveled edge 174 on the inside opening of the detector housing 154. The bevel has a larger diameter on the inside of the housing than halfway through the housing. The bevel of the walls of the jam housing cam 172 is similar to the neck of the bolt sleeve 132.

When the door bolt 112 is in the unlocked position with door bolt handle 122 to the right side of bolt channel 118, detector switch 150 and intruder switch 152 are both in their normally open position as shown in FIG. 8. Therefore, neither the operating indicator lamp 36 nor the buzzer 34 is actuated.

When the door bolt 112 is placed in the locked position with door bolt handle 122 in elongated locking groove 120, the door bolt 112 and the bolt sleeve 132 extend into the detector housing 154 through the opening formed by the jam housing cam 172. The bolt sleeve 132 applies force to the actuating arm 164 of the detector switch 150 as shown in FIG. 6. The force on actuating arm 164 depresses the actuating button 166, closing the switch contacts of switch 150. With the contacts of switch 150 closed, the operating indicator lamp 36 is actuated. This informs the occupant or operator of the device that the invention is in the operating mode. The switch contacts of switch 152 are still in their normally open position since the bolt sleeve 132 has applied no force to the actuating arm 168 so as to depress the actuating button 170 of switch 152.

If an intruder attempts to force open the door, the door bolt 112 will move toward

jam housing cam

172 and 174 in the direction designated 176 in FIG. 7. The bolt sleeve 132 moves a small distance and then contacts the jam housing cam 172 at 174. As the door bolt 112 is pushed further, the jam housing cam 172 exerts a force on the bolt sleeve 132 in the direction designated 178, overcoming the tension of spring 134. This causes the bolt sleeve 132 to move in the direction 178, applying force to the actuating arm 168 of the intruder switch 152. The actuating arm 168 depresses the actuator button 170 of switch 152, closing its contacts. Now, since both

switches

150 and 152 are closed, the buzzer 34 will be actuated by the battery 42, indicating the presence of an intruder.

The structure shown in FIGS. 9 through 18 includes a door bolt housing 210, a door bolt 212, detector means 214 and alarm means which will not be discussed in detail as they are similar to that shown in FIGS. 1 through 9.

The door bolt housing 210 is very similar to that shown in FIGS. 5, 6, 7, and 8 and includes a bolt channel 216 in which the bolt handle 218 travels. The door bolt housing 210 is fastened to the door by means of suitable fasteners 220. The door bolt 212, a generally straight rod, moves in the door bolt housing 210 as the door bolt handle 218 is moved from its unlocked position to the far right in the bolt channel 216 to the locked position with the door bolt handle 218 to the far left of bolt channel 216 in locking groove 222. The door bolt 212 is rotated as the door bolt handle 218 is placed in locking groove 222.

The detector means 214 includes a detector switch 224, an intruder switch 226, a spring 228, shown in FIGS. 11 and 12, and a detector housing 230 to which the

switches

224 and 226 are fastened by means of support bracket 232. The detector switch 224 has normally open contacts controlled by an actuator bat handle or button 234. When the actuator bat handle 234 is snapped away from its normal position, the contacts of switch 224 close. The normal position of the actuator bat handle or button 234 is toward the door jamb in FIG. 16. The contacts of intruder switch 226 are normally closed and are controlled by actuator button 236. When the actuator button 236 is depressed, the switch contacts of switch 226 open.

The detector switch 224 and the intruder switch 226 are connected to the alarm means and power source by appropriate connecting means to form the electrical circuit of FIG. 18. The battery 42 is connected to the operating indicator lamp 36 through detector switch 224. The buzzer 34 is connected to the battery 42 I through detector switch 224 and intruder switch 226.

The door bolt 212 when in the locked position enters the detector housing 230 through opening 238. A bolt cam 240 shown in detail in FIGS. 13 and 14 is located on the end of the door bolt 212 that enters the detector means housing 230. The bolt cam 240 is an L-shaped slot in the end of the door bolt to provide the correct actuating sequence of the detector switch 224. When the door bolt 212 is in an unlocked position, detector switch 224 is not actuated because actuator bat handle 234 is not snapped by door bolt 212. When the door bolt 212 is extended far enough into the housing 230 to reach the detector switch 224, the actuator bat handle 234 of switch 224 lines up with bolt cam 240 so as not to be actuated as shown in FIG. 16. When the door bolt handle 218 is rotated and pushed downward into the locking groove 222 of bolt channel 216, the door bolt 212 also rotates and bolt cam 240 engages the actuator bat handle 234 forcing the actuator bat handle 234 to snap over to position as shown in FIG. 17, thus closing the contacts. The contact will remain closed until the door bolt is unlocked.

The door bolt 212 engages the actuator button 236 of intruder switch 226 during the unlocked bolt movement before the bolt handle 218 is rotated down into locking groove 222. Therefore, as the bolt 212 is extended into the housing 230, intruder switch 226 is actuated first, opening its contacts. As the bolt is rotated into the locking groove 222, detector switch 224 is actuated and its contacts close. The battery 42 now appears across the operating indicator lamp 36 and the lamp is actuated. The buzzer 34 is not actuated because the switch contacts of the intruder switch 226 are open.

As the bolt is extended into the housing 230 through opening 238 with the bolt handle 218 travelling to the left in FIG. 10, the spring 228 is displaced by the bolt 212 as seen in FIGS. 12 and 15. The bolt 212 is under tension from spring 228, although no movement of the door bolt 212 will occur because the door bolt is held rigid by door bolt housing 210.

If an intruder tries to force open the door, the door bolt 212 will move away from the door jamb and opening 238 of housing 230 to the left in FIG. 15. As the door bolt 212 moves, the switch contacts of detector switch 224 remain closed. As the door bolt 212 is moved by the applied force of the intruder, actuator button 236 of switch 226 is released as the movement exceeds approximately one-half the thickness or diameter of the door bolt 212. When actuator button 236 of intruder switch 226 is released, the switch contacts close, placing the battery 42 across the buzzer 34, alerting the occupants that an intruder is present.

If the intruder severs the bolt, spring 228 will force the door bolt 212 to the end of the opening 238 of housing 230 with the same results as force applied to the door. The door bolt 212 will move away from the actuator button 236 of switch 226, which closes its contacts and activates the buzzer 34. Therefore, whether the intruder applies force to the door or severs the bolt, the buzzer 34 will be activated.

The structures shown in FIGS. 1 through 18 actuate an alarm when an intruder applies force to a door or severs the door bolt after the door bolt is in the locked position. Through various bolt and detector switch arrangements, the presence of an intruder is detected by the position of the door bolt.

Whereas the preferred forms of the invention have been shown and described herein, it should be realized that there may be many modifications, alterations and substitutions thereto.

I claim:

1. In a door bolt with electric alarm, a door bolt, a door bolt housing assembly mounted to a door and carrying said door bolt as the door bolt travels between locked and unlocked positions, alarm means including a power source, an operating indicator and an alarm, means for detecting the position of said door bolt including a detector switch and an intruder switch connected in circuit with said power source, operating indicator and alarm, said detector switch having normally open contacts, which are moved to a closed position when said door bolt is moved to a locked position, completing a circuit between said power source and indicator, said intruder switch including normally open 7 switch contacts connecting said alarm to said power source through the contacts of said detector switch, an actuating arm controlling the opening and closing of said intruder switch contacts and a roller wheel fastened on said actuating arm and positioned for contact by said door bolt when the door bolt is in a locked position, movement of said door bolt in a manner other than normal opening or closing causing said intruder switch to complete an electrical circuit from said power source to said alarm.

2. The structure of claim 1 further characterized in that said alarm is a buzzer.

3. The structure of claim 1 further characterized in that said operating indicator is a lamp.

4. The structure of claim 1 further characterized in that said intruder switch and detector switch are positioned such that the opening of said switch contacts of said intruder switch occur before said door bolt depresses said actuator button of said detector switch.

5. The structure of claim 4 further characterized in that said door bolt releases said roller wheel and said actuating arm of said intruder switch closing said switch contacts when an intruder applies force to the door or severs said door bolt, said alarm actuated by the closing of said switch contacts of said intruder switch and said detector switch.

6. The structure of claim 5 further characterized in that said door bolt housing assembly includes means for positioning said door bolt to depress and release the actuator button of said detector switch as said door bolt is placed in the locked position and to depress and release said actuator button as said door bolt is unlocked.

7. The structure of claim 6 further characterized in that the contacts of said detector switch are latched closed when said actuator button is depressed and released by said door bolt when being locked and in that said contacts are opened when said actuator button is depressed and released by said door bolt when being unlocked.

8. In a door bolt with electric alarm, a door bolt, a door bolt housing assembly mounted to a door and carrying said door bolt as the door bolt travels between locked and unlocked positions, alarm means including a power source, an operating indicator and an alarm, means for detecting the position of said door bolt including a detector switch and an intruder switch connected in circuit with said power source, operating indicator and alarm, said detector switch having normally open contacts, which are moved to a closed position when said door bolt is moved to a locked position, completing a circuit between said power source and indica tor, said intruder switch including a pair of normally open contacts, an actuator button controlling the opening and closing of said intruder switch contacts, and an actuator arm which, when displaced, actuates said actuator button, said door bolt including a bolt sleeve fastened by'spring means on the end of said door bolt that enters said detecting means, with said detecting means including a housing having a jam housing cam, movement ,of said door bolt in a manner other than normal opening or closing causing said intruder switch to complete an electrical circuit from said power source to said alarm.

9. The structure of claim 8 further characterized in that said bolt sleeve contacts said jam housing cam causing said bolt sleeve to apply force to said actuating arm of said intruder switch when an intruder applies force to the door or severs said door bolt and attempts to open the door, said bolt sleeve continuing to apply force to said actuating arm of said detector switch.

10. The structure of claim 9 further characterized in that said alarm is connected to said power source through the switch contacts of said detector switch and said switch contacts of said intruder switch, said switch contacts of said intruder switch closing when said bolt sleeve applies force to said actuating arm of said intruder switch, said alarm being actuated by said power source.

11. in a door bolt with electric alarm, a door bolt, a door bolt housing assembly mounted to a door and carrying said door bolt as the door bolt travels between locked and unlocked positions, alarm means including a power source, an operating indicator and an alarm, means for detecting the position of said door bolt including a detector switch and an intruder switch connected in circuit with said power source, operating indicator and alarm, said detector switch having normally open contacts, which are moved to a closed position when said door bolt is moved to a locked position, completing a circuit between said power source and indicator, said intruder switch including normally open switch contacts, with both said intruder switch and detector switch including an actuator button controlling the opening and closing of said switch contacts, said alarm being connected to said power source through the contacts of said intruder switch and through the contacts of said detector switch, said detector means including a spring applying force to said door bolt in a normal direction to the door, said door bolt including a bolt cam at the end thereof extending into said detecting means, said bolt cam being arranged in said door bolt so as to contact said actuator button of said detector switch only when said door bolt is in the locked position, movement of said door bolt in a manner other than normal opening or closing said intruder switch to complete an electrical circuit from said power source to said alarm.

12. The structure of claim 11 further characterized in that said actuator button of said intruder switch is depressed opening said contacts when said door bolt is in the locked position before said bolt cam contacts said actuator button of said detector switch, said switch contacts of said detector switch closing when said bolt cam contacts said actuator button actuating said operating indicator.

13. The structure of claim 12 further characterized in that said door bolt allows said actuator button of said intruder switch to be released when an intruder applies force to the door and said door bolt moves away from said actuating button of said intruder switch or when intruder severs said door bolt and said spring pushes said door bolt away from said actuator button of said intruder switch.

14. The structure of claim 13 further characterized in that said contacts of said intruder switch close when an intruder applies force or severs said door bolt and said door bolt releases said actuator button, said alarm being actuated by the switch contacts of said intruder switch.

Claims

1. In a door bolt with electric alarm, a door bolt, a door bolt housing assembly mounted to a door and carrying said door bolt as the door bolt travels between locked and unlocked positions, alarm means including a power source, an operating indicator and an alarm, means for detecting the position of said door bolt including a detector switch and an intruder switch connected in circuit with said power source, operating indicator and alarm, said detector switch having normally open contacts, which are moved to a closed position when said door bolt is moved to a locked position, completing a circuit between said power source and indicator, said intruder switch including normally open switch contacts connecting said alarm to said power source through the contacts of said detector switch, an actuating arm controlling the opening and closing of said intruder switch contacts and a roller wheel fastened on said actuating arm and positioned for contact by said door bolt when the door bolt is in a locked position, movement of said door bolt in a manner other than normal opening or closing causing said intruder switch to complete an electrical circuit from said power source to said alarm.

8. In a door bolt with electric alarm, a door bolt, a door bolt housing assembly mounted to a door and carrying said door bolt as the door bolt travels between locked and unlocked positions, alarm means including a power source, an operating indicator and an alarm, means for detecting the position of said door bolt including a detector switch and an intruder switch connected in circuit with said power source, operating indicator and alarm, said detector switch having normally open contacts, which are moved to a closed position when said door bolt is moved to a locked position, completing a circuit between said power source and indicator, said intruder switch including a pair of normally open contacts, an actuator button controlling the opening and closing of said intruder switch contacts, and an actuator arm which, when displaced, actuates said actuator button, said door bolt including a bolt sleeve fastened by spring means on the end of said door bolt that enters said detecting means, with said detecting means including a housing having a jam housing cam, movement of said door bolt in a manner other than normal opening or closing causing said intruder switch to complete an electrical circuit frOm said power source to said alarm.