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US4074552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burglar resistance lock adapter kit
Assignee: Individual
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Filing: 1977-01-17
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Granted: 1978-02-21
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Expires: 1997-01-17
Abstract
Abstract A kit mountable on a front side of a door and against a lock mounted in the door, the kit thus enclosing a front side of the lock from direct contact therewith by a burglar; the kit including a metal frame and a forwardly bulging metal plate secured by bolts to the door front side and which enclose a rotatable key bushing position in front of the lock tumbler which is thus accessible only by a specially long key for being turned.
Inventors
- 👤 Frank C. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:52
CPC Classifications
E; E05; E05B; E05B17/00; E05B17/20; E05B17/2084; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7915; Y10T70/7921
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
A burglar resistance lock adapter kit comprising, in combination, a thin steel plate and a thin steel frame of approximately the same size mounted on a front side of a door by means of carriage bolts and enclosing a rotatable key bushing positioned in front of a tumbler of a lock of said door, an extra long key for insertion through said key bushing and into said lock for unlocking said lock, a sleeve fitted around said key bushing with said key bushing being rotatable within said sleeve, said thin steel plate having a bulging section and a central opening in said bulging section, said sleeve and key bushing extending through said central opening, and flange means on said key bushing and sleeve to retain them behind said bulging section of said thin steel plate.
Claim 2
Dependent Claim
135 words
A burglar resistance lock adapter kit comprising, in combination, a thin steel plate and a thin steel frame of approximately the same size mounted on a front side of a door by means of carriage bolts and enclosing a rotatable key bushing positioned in front of a tumbler of a lock of said door, an extra long key for insertion through said key bushing and into said lock for unlocking said lock, a sleeve fitted around said key bushing with said key bushing being rotatable within said sleeve, said thin steel plate having a bulging section and a central opening in said bulging section, said sleeve and key bushing extending through said central opening, and flange means on said key bushing and sleeve to retain them behind said bulging section of said thin steel plate.
Claim 3
Dependent Claim
32 words
The combination as set forth in claim 1 wherein said key bushing includes a slot that can be aligned with a key slot of said lock tumbler, for receiving said key therethrough.
Claim 4
Dependent Claim
59 words
The combination as set forth in claim 1 wherein each said bolt includes a square shank portion adjacent a rounded low head thereof and which aligns with a square opening through said plate, each said bolt extending also through said frame and door and being fitted with a washer, lockwasher and nut on an inner side of said door.
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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |