US3705739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panic lock device
Assignee: ILCO CORP
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Filing: 1971-07-07
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Granted: 1972-12-12
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Expires: 1991-07-07
Abstract
Abstract An improved panic lock device of the type in which a latch bolt is retracted responsive to forces exerted on an eccentrically weighted, pivotally mounted panic bar. The improvement relates to a shear pin assembly operatively projected into position to prevent downward pivotal movement of the bar and, hence, premature retraction of the latch bolt should the bar support spring lose their temper, as would be the case if the latter were subjected to high temperature conditions.
Inventors
- 👤 Norman R Adler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:51
CPC Classifications
E; E05; E05B; E05B65/00; E05B65/10; E05B65/1046; E05B65/106; E05B65/1066; E05B65/104; Y; Y10; Y10S; Y10S292/00; Y10S292/66; Y10T; Y10T292/00; Y10T292/08; Y10T292/0908; Y10T292/1043; Y10T292/1075; Y10T292/1083; Y10T292/1089
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
A panic lock device comprising a latch bolt casing, a panic bar eccentrically mounted to said casing for movement about a horizontal pivot axis and gravitationally urged in a first pivotal direction, bar support spring means yieldingly urging said bar against movement in said pivotal direction, a latch bolt mounted for reciprocal movement inwardly and outwardly of said casing, latch bolt operator means intErposed between said panic bar and bolt for retracting said bolt responsive to movement of said bar in said first pivotal direction, shear pin means mounted in said casing, spring means urging said shear pin means in a first direction, low melting link means interposed between said shear pin means and casing and normally blocking movement of said pin in said first direction, and a shear pin socket member positioned to receive a portion of said pin responsive to melting of said link means, said shear pin in said socket received position preventing movement of said bar in said first pivotal direction and, hence, retraction of said latch bolt under said gravitational forces, while permitting said movement of said parts responsive to forces against said bar sufficient to shear said pin.
Claim 2
Dependent Claim
194 words
A panic lock device comprising a latch bolt casing, a panic bar eccentrically mounted to said casing for movement about a horizontal pivot axis and gravitationally urged in a first pivotal direction, bar support spring means yieldingly urging said bar against movement in said pivotal direction, a latch bolt mounted for reciprocal movement inwardly and outwardly of said casing, latch bolt operator means intErposed between said panic bar and bolt for retracting said bolt responsive to movement of said bar in said first pivotal direction, shear pin means mounted in said casing, spring means urging said shear pin means in a first direction, low melting link means interposed between said shear pin means and casing and normally blocking movement of said pin in said first direction, and a shear pin socket member positioned to receive a portion of said pin responsive to melting of said link means, said shear pin in said socket received position preventing movement of said bar in said first pivotal direction and, hence, retraction of said latch bolt under said gravitational forces, while permitting said movement of said parts responsive to forces against said bar sufficient to shear said pin.
Claim 3
Dependent Claim
27 words
The lock device of claim 1 wherein said link material melts at a temperature below the temperature at which said bar support spring means loses its temper.
Claim 4
Dependent Claim
29 words
The device of claim 1 wherein said shear pin receiver socket is formed on said latch bolt, and said pin is mounted in a bore formed in said casing.
Claim 5
Dependent Claim
59 words
The device of claim 3 wherein said shear pin includes an annular extension portion of larger diameter than said socket, said extension portion being located intermediate the length of said pin, said pin including a weakened neck portion positioned to lie at the interface between said extension and bolt when portions of said pin are received in said socket.
Claim 6
Dependent Claim
15 words
The device of claim 4 wherein said neck portion is disposed immediately adjacent said extension.
Claim 7
Dependent Claim
175 words
In a panic lock device of the type including a latch bolt casing, a panic bar pivotally mounted to said casing and urged by gravity to move in a first pivotal direction, and bar support spring means yieldingly biasing said bar against movement in said first direction, a latch bolt mounted for reciprocal movement inwardly and outwardly of said latch bolt casing, latch bolt operator means operatively connected to said panic bar for retracting said bolt responsive to movement of said bar in said first pivotal direction, the improvement which comprises a shear pin mounted in said latch casing, spring means urging said shear pin in a first direction, low melting link means interposed between said shear pin and casing and normally blocking movement of said pin in said first direction, a shear pin receiver socket on said latch bolt positioned in registry with said pin in the outward position of said latch bolt, said spring means being effective to project portions of said pin into said socket responsive to melting of said link means.
Claim 8
Dependent Claim
175 words
In a panic lock device of the type including a latch bolt casing, a panic bar pivotally mounted to said casing and urged by gravity to move in a first pivotal direction, and bar support spring means yieldingly biasing said bar against movement in said first direction, a latch bolt mounted for reciprocal movement inwardly and outwardly of said latch bolt casing, latch bolt operator means operatively connected to said panic bar for retracting said bolt responsive to movement of said bar in said first pivotal direction, the improvement which comprises a shear pin mounted in said latch casing, spring means urging said shear pin in a first direction, low melting link means interposed between said shear pin and casing and normally blocking movement of said pin in said first direction, a shear pin receiver socket on said latch bolt positioned in registry with said pin in the outward position of said latch bolt, said spring means being effective to project portions of said pin into said socket responsive to melting of said link means.
Claim 9
Dependent Claim
67 words
The device of claim 6 wherein said shear pin includes an enlarged annular extension and a reduced diameter neck portion disposed immediately adjacent said extension, said extension being of greater diameter than said socket, whereby, when said portions of said pin are projected into said socket, said extension will abut said bolt adjacent said socket, thereby locating said neck portion substantially at the surface of said bolt.
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |