Combined lock and alarm

Claim 2

A combined lock and alarm comprising, a housing, a dead bolt mounted for movement relative to the housing to a release position wholly within the housing and to a locked position projecting partially from the housing, a keeper plate having an opening to receive the bolt when projecting from the housing, a plunger within the housing movable along a path parallel to the path of movement of the bolt, a lost-motion connection between the bolt and plunger for moving the plunger to a predetermined displaced position within the housing responsive solely to the movement of the dead bolt substantially to said release position, means yieldingly urging the plunger from the housing, the keeper plate having an opening to receive the plunger, the plunger opening being laterally offset from the plunger axis when the bolt is in locked position within the bolt opening in the keeper plate, an alarm within the housing, and means carried by the plunger to cause the alarm to sound when the plunger reaches said displaced position and to sound when the plunger seats in the plunger opening in the keeper plate or otherwise reaches an extended position relative to the housing.

Claim 3

A combined lock and alarm comprising, a housing, a dead bolt mounted for movement relative to the housing to a release position wholly within the housing and to a locked position projecting partially from the housing, a keeper plate having an opening to receive the bolt when projecting from the housing, a plunger within the housing movable along a path parallel to the path of movement of the bolt, a lost-motion connection between the bolt and plunger for moving the plunger to a predetermined displaced position within the housing responsive solely to the movement of the dead bolt substantially to said release position, means yieldingly urging the plunger from the housing, the keeper plate having an opening to receive the plunger, the plunger opening being laterally offset from the plunger axis when the bolt is in locked position within the bolt opening in the keeper plate, an alarm within the housing, and means carried by the plunger to cause the alarm to sound when the plunger reaches said displaced position and to sound when the plunger seats in the plunger opening in the keeper plate or otherwise reaches an extended position relative to the housing.

Claim 4

A combined lock and alarm comprising, a housing, a dead bolt mounted for movement relative to the housing to a release position wholly within the housing and to a locked position projecting partially from the housing, a keeper plate having an opening to receive the bolt when projecting from the housing, a plunger within the housing movable along a path parallel to the path of movement of the bolt, a lost-motion connection between the bolt and plunger for moving the plunger to a predetermined displaced position within the housing responsive solely to the movement of the dead bolt substantially to said release position, means yieldingly urging the plunger from the housing, the keeper plate having an opening to receive the plunger, the plunger opening being laterally offset from the plunger axis when the bolt is in locked position within the bolt opening in the keeper plate, an alarm within the housing, and means carried by the plunger to cause the alarm to sound when the plunger reaches said displaced position and to sound when the plunger seats in the plunger opening in the keeper plate or otherwise reaches an extended position relative to the housing.

Claim 5

A combined lock and alarm as claimed in claim 1 wherein, there is an electric circuit for the alarm including a fixed contact, and the means carried by the plunger to cause the alarm to sound comprises a contact in the circuit and closable with the fixed contact when the plunger is in extended position.

Claim 6

A combined lock and alarm as claimed in claim 2 wherein, there is a second contact on the plunger spaced axially of the plunger from the first-mentioneD plunger contact to close with the fixed contact when the plunger is retracted to said displaced position, and the fixed contact is located between the plunger contacts.

Claim 7

A combined lock and alarm as claimed in claim 3 wherein, the contacts on the plunger are spaced and positioned on the plunger so that neither contact is closed with the fixed contact when the plunger is bearing against the keeper plate.

Claim 8

A combined lock and alarm as claimed in claim 4 wherein, the circuit includes a switch having an operating arm in the path of movement of the bolt, whereby the movement of the bolt to extended position will allow the switch to close and moving the bolt to retracted position opens the switch.

Claim 9

A combined lock and alarm as claimed in claim 5 wherein, there are batteries within the housing as part of the circuit.

Claim 10

A combined lock and alarm as claimed in claim 6 wherein, there is a battery compartment within the housing and an access door removable from the housing for removal and replacement of the batteries within the compartment, the access door being on the side of the housing from which the bolt projects to lock.

Claim 11

A combined lock and alarm comprising, a housing, a dead bolt mounted for movement relative to the housing to a release position wholly within the housing and to a locked position projecting partially from the housing, a keeper plate having an opening to receive the volt when projecting from the housing, a plunger within the housing movable along a path parallel to the path of movement of the bolt, a lost-motion connection between the bolt and plunger, means yieldingly urging the plunger from the housing, the keeper plate having an opening to receive the plunger, the plunger opening being laterally offset from the plunger axis when the bolt is in locked position within the bolt opening in the keeper plate, an alarm within the housing, means carried by the plunger to cause the alarm to sound when the plunger seats in the plunger opening in the keeper plate or otherwise reaches an extended position relative to the housing, and an electric circuit for the alarm including a fixed contact, the means carried by the plunger to cause the alarm to sound comprising a contact in the circuit and closable with the fixed contact when the plunger is in extended position, the connection between the bolt and plunger including a pin depending from the bolt to strike one of the contacts carried by the plunger.

Claim 12

A combined lock and alarm comprising, a housing, a dead bolt mounted for movement relative to the housing to a release position wholly within the housing and to a locked position projecting partially from the housing, a keeper plate having an opening to receive the volt when projecting from the housing, a plunger within the housing movable along a path parallel to the path of movement of the bolt, a lost-motion connection between the bolt and plunger, means yieldingly urging the plunger from the housing, the keeper plate having an opening to receive the plunger, the plunger opening being laterally offset from the plunger axis when the bolt is in locked position within the bolt opening in the keeper plate, an alarm within the housing, means carried by the plunger to cause the alarm to sound when the plunger seats in the plunger opening in the keeper plate or otherwise reaches an extended position relative to the housing, and an electric circuit for the alarm including a fixed contact, the means carried by the plunger to cause the alarm to sound comprising a contact in the circuit and closable with the fixed contact when the plunger is in extended position, the connection between the bolt and plunger including a pin depending from the bolt to strike one of the contacts carried by the plunger.

Claim 13

A combined lock and alarm as claimed in claim 8 wherein, there are means to adjust the point of meeting of the pin and the contact on the plunger when the bolt is retracted.