Combined door lock and alarm

Claim 2

A door-closure safety device for use with a chained slidebolt, comprising a unitary frame with means for securing the same to one of two relatively movable door and door-frame structures to be monitored for effectively closed position, said frame including elongated guide means for the guided captive sliding displacement of an inserted slide bolt on an alignment generally normal to adjacent openable edges of said structures, said guide means having a bolt-insertion opening remote from said openable edges and terminating at a stop end near said openable edges, and electrically operated alarm means including a circuit comprising a battery and an alarm generator and circuit-closure means, said alarm means including a member normally resiliently urged out of circuit-closing position and having a cam surface normally in the path of movement of an inserted slide-bolt along said guide means at a location intermediate said opening and said stop end, said member being displaceable into circuit-closing condition upon cammed actuation by said slide-bolt only for slide-bolt positions between said intermediate location and said stop end, and latch means operative upon said bolt primarily at said stop end of slide-bolt movement to provide an action unique to the stop end to retain at said stop end a displaced condition of said member for slide-bolt movement to said stop end, whereby said alarm means is inoperative to generate an alarm indication when the inserted slide-bolt is in the region at and near the insertion location, and whereby said alarm means is operative to hold alarm-circuit closure when and as long as the inserted slide-bolt is in the region between said stop end and the location of initial circuit closure, and especially in the operative condition of said latch means.

Claim 3

A safety device according to claim 1, in which said latch means comprises a down-ramp formation in said member and operative upon said slide bolt substantially only at the stop end of said guide means.

Claim 4

A door-closure safety device for use with a chained slide-bolt, comprising a unitary frame with means for securing the same to one of two relatively movable door and door-frame structures to be monitored for effectively closed position, said frame including elongated guide means for the guided captive sliding displacement of an inserted slide-bolt on an alignment generally normal to adjacent openable edges of said structures, said guide means having a bolt-insertion opening remote from said openable edges and terminating at a stop end near said openable edges, and electrically operated alarm means including a circuit comprising a battery and an alarm generator and circuit-closure means, said alarm means including a member normally resiliently urged out of circuit-closing position and having a cam surface normally in the path of movement of an inserted slide-bolt along said guide means at a location intermediate said opening and said stop end, said member being displaceable into circuit-closing condition upon cammed actuation by said slide-bolt only for slide-bolt positions between said intermediate location and said stop end, and said bolt and cam surface being formed to maintain a displaced condition of said member for slide-bolt movement to said stop end, whereby said alarm means is inoperative to generate an alarm indication when the inserted slide-bolt is in the region at and near the insertion location, And whereby said alarm means is operative to hold alarm-circuit closure when and as long as the inserted slide-bolt is in the region between said stop end and the location of initial circuit closure, said cam surface portion of said member including an up ramp in approach to but effectively terminating prior to slide-bolt limiting at said end and including a down ramp in the vicinity of slide-bolt limiting at said end, whereby resilient loading of said member retains the slide-bolt at said end should it be chain driven to said end.

Claim 5

A door-closure safety device for use with a chained slide-bolt, comprising a unitary frame with means for securing the same to one of two relatively movable door and door-frame structures to be monitored for effectively closed position, said frame including elongated guide means for the guided captive sliding displacement of an inserted slide-bolt on an alignment generally normal to adjacent openable edges of said structures, said guide means having a bolt-insertion opening remote from said openable edges and terminating at a stop end near said openable edges, and electrically operated alarm means including a circuit comprising a battery and an alarm generator and circuit-closure means, said alarm means including a member normally resiliently urged out of circuit-closing position and having a cam surface normally in the path of movement of an inserted slide-bolt along said guide means at a location intermediate said opening and said stop end, said member being displaceable into circuit-closing condition upon cammed actuation by said slide-bolt only for slide-bolt positions between said intermediate location and said stop end, and said bolt and cam surface being formed to maintain a displaced condition of said member for slide-bolt movement to said stop end, whereby said alarm means is inoperative to generate an alarm indication when the inserted slide-bolt is in the region at and near the insertion location, And whereby said alarm means is operative to hold alarm-circuit closure when and as long as the inserted slide-bolt is in the region between said stop end and the location of initial circuit closure, said cam surface portion of said member including an up ramp in approach to but effectively terminating prior to slide-bolt limiting at said end and including a down ramp in the vicinity of slide-bolt limiting at said end, whereby resilient loading of said member retains the slide-bolt at said end should it be chain driven to said end.

Claim 6

A door-closure safety device according to claim 3, in which said frame includes an outer housing into which said securing means is embodied, said housing having an open side which is applied against the member to which the mounted frame is securable, and an electrical chassis carried within said housing and bodily removable through the open side of said housing.

Claim 7

A door-closure safety device according to claim 4, in which said member is carried by said chassis.

Claim 8

A door-closure safety device according to claim 4, in which said chassis includes means for the bodily removable support of a unit-handling buzzer.

Claim 9

A door-closure safety device according to claim 4, in which said chassis includes battery-support means comprising spaced parallel guide members for guided retention of a battery inserted along its longitudinal axis, said housing having a lateral port aligned with said axis and of size to permit battery insertion and removal without requiring frame dismounting.

Claim 10

A door-closure safety device according to claim 7, in which said axis is parallel to but offset from the plane of the open side of said housing, and a closure member carried by said housing for removably closing said port.

Claim 11

A door-closure safety device according to claim 8, in which said removable closure member is a plate, slidably guided by said housing on an insertion axis generally normal to the battery insertion axis and to the plane of the open side of said housing.

Claim 12

A door-closure safety device according to claim 9, in which said housing is electrically conductive and includes an integral battery-terminal-engaging grounding lug positioned in the path of movement of a terminal of an inserted battery.

Claim 13

A door-closure safety device according to claim 10, in which said removable closure plate includes resilient means engaging an inserted battery and loading the inserted battery into pressured terminal contact at said grounding lug.

Claim 14

A door-closure safety device according to claim 3, and including knob-spindle journal means aligned in clearance with said alarm means.

Claim 15

A door-closure safety device according to claim 3, and latch mechanism including a knob spindle journaled on an alignment through said frame and in clearance with said alarm means, said latch mechanism including externally actuable means for selectively dogging the same, and switch means operated by said externally actuable means and operatively associated with said circuit.

Claim 16

A door-closure safety device according to claim 13, in which said switch means is series connected with said circuit, the connection being such that said switch is closed for the dog-selected condition of said externally actuable means, and said switch is open for the selected condition in which said latch mechanism is not dogged.

Claim 17

A door-closure safety device according to claim 3, and including a slide-bolt, chain and door-frame anchoring device, said chain and anchoring device having removable locking engagement.

Claim 18

A door-closure safety device according to claim 15, in which said last-mentioned locking engagement is key operated.

Claim 19

A door-closure safety device according to claim 15, in which said last-mentioned engagement is snap locking.

Claim 20

A door-closure safety device according to claim 3, in which said frame is electrically conductive and includes a fixed battery-grounding element contacting one pole of said battery, said member including a flexibLe conductive contact wiper element displaceable into and out of resiliently loaded wiping contact with the other pole of said battery in accordance with displacement of said member.

Claim 21

A door-closure safety device according to claim 3, in which the cam surface portion of said member is electrically insulative.