US3727210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock and alarm device
Assignee: 3M Co
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Filing: 1971-04-23
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Granted: 1973-04-10
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Expires: 1991-04-23
Abstract
Abstract A bolt-type lock wherein the bolt is supported by a resilient member in the projected locking position such that the bolt can be deflected upon a predetermined opening force being applied against the closure members. Electrical contact means are positioned at the opening through which the bolt is projected and spaced from the bolt to be contacted by the bolt and close a circuit when said predetermined force is applied.
Inventors
- 👤 P Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:05
CPC Classifications
E; E05; E05B; E05B45/00; E05B45/06; E05B45/08; E05B45/12; E05B45/125; Y; Y10; Y10S; Y10S70/00; Y10S70/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A lock apparatus for use with cooperating closure members to effect an alarm upon limited relative movement of said closure members, said apparatus comprising a bolt member formed to join said closure members when in a projected position, said bolt being formed to afford electrical conduction, a support member adapted to be secured to one of said closure members, said support member having an opening through which said bolt may be moved from a retracted position to a projected position, resilient support means for supporting said bolt for movement along its axis from said retracted to said projected pOsition through said opening and for movement transverse to its axis, and electrical contact means positioned adjacent the opening in a position for contact by said bolt such that movement of said bolt in said opening in a direction transverse to its axis under a predetermined force will afford contact with said contact means to close a circuit.
Claim 2
Dependent Claim
156 words
A lock apparatus for use with cooperating closure members to effect an alarm upon limited relative movement of said closure members, said apparatus comprising a bolt member formed to join said closure members when in a projected position, said bolt being formed to afford electrical conduction, a support member adapted to be secured to one of said closure members, said support member having an opening through which said bolt may be moved from a retracted position to a projected position, resilient support means for supporting said bolt for movement along its axis from said retracted to said projected pOsition through said opening and for movement transverse to its axis, and electrical contact means positioned adjacent the opening in a position for contact by said bolt such that movement of said bolt in said opening in a direction transverse to its axis under a predetermined force will afford contact with said contact means to close a circuit.
Claim 3
Dependent Claim
61 words
A lock apparatus according to claim 1 wherein said resilient support means comprises a resilient rod fixed to said bolt, and said apparatus comprises support means for said rod affording sliding movement of said rod to move said bolt between said retracted and projected position and affording a cantilever mount for said rod when said bolt is in said projected position.
Claim 4
Dependent Claim
85 words
A lock apparatus according to claim 1 wherein said resilient support means comprises a fixed resilient rod and a fixed support for one end of said rod to project the same toward said opening, and wherein said bolt is formed with an opening to slidably receive said rod to afford movement of said bolt on said rod between a projected position and a retracted position, and wherein said apparatus comprises means for sliding said bolt on said fixed rod between said projected and retracted positions.
Claim 5
Dependent Claim
58 words
A lock apparatus according to claim 2 wherein said contact means comprises an electrical contact connected to said resilient support means and a conductive member positioned at said opening for contact by said bolt when a predetermined force is applied against said bolt to flex said rod sufficiently to move said bolt into contact with said conductive member.
Claim 6
Dependent Claim
50 words
A lock apparatus according to claim 3 wherein said contact means comprises a pair of spaced contact members positioned at the edge of said opening for engagement by said bolt to close a circuit when said fixed rod is flexed sufficiently to move said bolt against said spaced contact members.
Claim 7
Dependent Claim
49 words
A lock apparatus according to claim 2 wherein a key operated lock cylinder is secured to the end of said rod opposite said bolt, and said support means includes a cavity for receiving said cylinder and retaining the same upon sliding movement of said bolt to said projected position.
Claim 8
Dependent Claim
28 words
A lock apparatus according to claim 1 wherein said support member supports a speaker to produce an audible signal upon contact of said bolt with said contact means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |