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US 9,959,718 B2Granted
Door alarm
OwnerWilliam S. Hendrieinventor
Life of this patent
Estimating the term…
Abstract
An alarm for a door is operable to generate an alarm signal when a rotary grip member of the door is rotated to a particular position, such as an unlocked position. The alarm comprises a housing having a strap retainer configured to receive and retain a strap to hold the housing to the rotary grip member. The alarm comprises a tilt switch for switching when the housing is tilted. Control circuitry is interconnected to the tilt switch and to an annunciator and is operable to activate the annunciator dependent on a state of the tilt switch.
Claims16
An alarm for a door having a rotary grip member comprising:
- a housing having a strap retainer configured to receive a strap;
- a tilt switch supported by said housing for switching when said housing is tilted;
- an annunciator;
- control circuitry interconnected with said tilt switch to receive an input signal from said tilt switch, said control circuitry operable to activate said annunciator dependent upon a state of said tilt switch;
- a strap for retention by said strap retainer to strap said housing to said rotary grip member so that said housing rotates with said rotary grip member, wherein said strap retainer comprises a pawl and said strap comprises teeth, said pawl and said teeth forming a ratchet mechanism when said strap is received by said strap retainer.
2 more elements
An alarm for a door having a rotary grip member comprising:
- a housing having a strap retainer configured to receive a strap;
- a tilt switch supported by said housing for switching when said housing is tilted;
- an annunciator;
- control circuitry interconnected with said tilt switch to receive an input signal from said tilt switch, said control circuitry operable to activate said annunciator dependent upon a state of said tilt switch;
- a strap for retention by said strap retainer to strap said housing to said rotary grip member so that said housing rotates with said rotary grip member, wherein said strap has a head at one end configured to receive the opposite end of said strap, said head having a pawl and said strap having teeth for forming a ratchet mechanism with said pawl when said opposite end is received by said head.
2 more elements
An alarm for a door having a rotary grip member comprising:
- a housing having a strap retainer configured to receive a strap;
- a tilt switch supported by said housing for switching when said housing is tilted;
- an annunciator;
- control circuitry interconnected with said tilt switch to receive an input signal from said tilt switch, said control circuitry operable to activate said annunciator dependent upon a state of said tilt switch;
- a strap for retention by said strap retainer to strap said housing to said rotary grip member so that said housing rotates with said rotary grip member, wherein said housing comprises a pair of strap retainers and said strap is an elasticized loop for holding said housing to said rotary grip member by looping around each of said strap retainers.
2 more elements
An alarm for a door having a rotary grip member comprising:
- a housing having a strap retainer configured to receive a strap;
- a tilt switch supported by said housing for switching when said housing is tilted;
- an annunciator;
- control circuitry interconnected with said tilt switch to receive an input signal from said tilt switch, said control circuitry operable to activate said annunciator dependent upon a state of said tilt switch;
- a strap for retention by said strap retainer to strap said housing to said rotary grip member so that said housing rotates with said rotary grip member,
- wherein said tilt switch is a first tilt switch and said alarm further comprises a second tilt switch and wherein said control circuitry is operable to activate said annunciator dependent on an on or off state of each of said first tilt switch and said second tilt switch and
- further comprising mode selection controls operable to select an alarm state of said first tilt switch and said second tilt switch, wherein said control circuitry is operable to activate said annunciator when said first tilt switch and said second tilt switch indicate said alarm state.
4 more elements
An alarm for a door having a rotary grip member comprising:
- a housing having a strap retainer configured to receive a strap;
- a tilt switch supported by said housing for switching when said housing is tilted;
- an annunciator;
- control circuitry interconnected with said tilt switch to receive an input signal from said tilt switch, said control circuitry operable to activate said annunciator dependent upon a state of said tilt switch;
- a strap for retention by said strap retainer to strap said housing to said rotary grip member so that said housing rotates with said rotary grip member, wherein said control circuitry is operable to maintain a count of triggering events, and to increment said count of triggering events in response to receiving said input signal.
2 more elements
An alarm for a door having a rotary actuator comprising:
- a housing coupled to the rotary actuator such that said housing rotates with said rotary actuator;
- a plurality of tilt switches supported by said housing for switching when said housing is tilted, said plurality of tilt switches oriented at an angle to one another to switch at different orientations of said housing;
- an annunciator;
- a mode selector;
- control circuitry interconnected with said plurality of tilt switches and said mode selector, said mode selector operable to select one of a plurality of possible states of said tilt switches and said control circuitry operable to activate said annunciator when said plurality of said tilt switches are in said selected state, wherein each one of said plurality of possible states corresponds to an orientation of said housing.
2 more elements
An alarm for a door having a rotary actuator comprising:
- a housing coupled to the rotary actuator such that said housing rotates with said rotary actuator;
- a plurality of tilt switches supported by said housing for switching when said housing is tilted, said plurality of tilt switches oriented at an angle to one another to switch at different orientations of said housing;
- an annunciator;
- a mode selector;
- control circuitry interconnected with said plurality of tilt switches and said mode selector, said mode selector operable to select one of a plurality of possible states of said tilt switches and said control circuitry operable to activate said annunciator when said plurality of said tilt switches are in said selected state, wherein said control circuitry is operable to maintain a count of a number of times said plurality of tilt switches are in said selected state.
2 more elements
An alarm for a door having a rotary actuator comprising:
- a housing coupled to the rotary actuator such that said housing rotates with said rotary actuator;
- a plurality of tilt switches supported by said housing for switching when said housing is tilted, said plurality of tilt switches oriented at an angle to one another to switch at different orientations of said housing;
- an annunciator;
- a mode selector;
- control circuitry interconnected with said plurality of tilt switches and said mode selector, said mode selector operable to select one of a plurality of possible states of said tilt switches and said control circuitry operable to activate said annunciator when said plurality of said tilt switches are in said selected state, wherein said housing forms a rotary grip member of a door.
2 more elements
Dependencies are inferred from the claim text.