Patent US3835675A successfully refreshed from Google Patents.
US3835675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Security padlock
Assignee: JUNKUNC BROS AMERICAN LOCK Co
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Filing: 1973-03-23
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Granted: 1974-09-17
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Expires: 1993-03-23
Abstract
Abstract A maximum security padlock having a shielding plate recessed and retained in the lock casing to minimize exposure of the lock''s replaceable key cylinder permitting only limited access to the key slot therein. The shielding plate is dovetailed into a complementary recess in the bottom of the casing and cooperates therewith to provide a flush, crevice-free padlock closure case around the lock mechanism. A pair of retaining members secure the shielding plate in the casing and accommodate release of the plate, to replace the key cylinder, only when the lock is in an unlocked condition.
Inventors
- 👤 G Lippisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:21
CPC Classifications
E; E05; E05B; E05B67/00; E05B67/02; Y; Y10; Y10T; Y10T70/00; Y10T70/40; Y10T70/413; Y10T70/437; Y10T70/446; Y10T70/452; Y10T70/459; Y10T70/487; Y10T70/489
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
222 words
In a shielded padlock, a casing having a pair of parallel bores, a shackle having a pair of parallel legs slidably engaged in said bores, locking means to secure said shackle in said casing when the legs are depressed into said bores, an interchangeable means for releasing said locking means including: a key cylinder mounted in said casing, a key plug rotatably carried in said cylinder and having a key slot operable bY turning movement of a key to release said shackle to allow one of said legs to be withdrawn from said casing, a cover place for said key cylinder slidably received in said casing to retain said key cylinder in said casing and releasable to afford access to said key cylinder, to accommodate changing of the key cylinder to a key cylinder having a different tumbler pin combination only when the shackle is released, a slidable interengaging connection between said cover plate and said casing extending along opposite sides and an inner end of said cover plate and providing a crevice-free, flush exterior casing surface, and spaced retaining means releasably pocketed in mating recesses in an unexposed surface of said cover plate in alignment with said parallel legs of said shackle, to retain said cover plate to said casing and to prevent release thereof except when said shackle is released.
Claim 2
Dependent Claim
222 words
In a shielded padlock, a casing having a pair of parallel bores, a shackle having a pair of parallel legs slidably engaged in said bores, locking means to secure said shackle in said casing when the legs are depressed into said bores, an interchangeable means for releasing said locking means including: a key cylinder mounted in said casing, a key plug rotatably carried in said cylinder and having a key slot operable bY turning movement of a key to release said shackle to allow one of said legs to be withdrawn from said casing, a cover place for said key cylinder slidably received in said casing to retain said key cylinder in said casing and releasable to afford access to said key cylinder, to accommodate changing of the key cylinder to a key cylinder having a different tumbler pin combination only when the shackle is released, a slidable interengaging connection between said cover plate and said casing extending along opposite sides and an inner end of said cover plate and providing a crevice-free, flush exterior casing surface, and spaced retaining means releasably pocketed in mating recesses in an unexposed surface of said cover plate in alignment with said parallel legs of said shackle, to retain said cover plate to said casing and to prevent release thereof except when said shackle is released.
Claim 3
Dependent Claim
51 words
The shielded padlock of claim 1, wherein the interengaging connection is dovetailed in configuration, and wherein the retaining means retaining said cover plate in fixed engagement with said casing comprises a pair of spaced pins, each aligned with one of said shackle legs and unexposed except when said shackle is released.
Claim 4
Dependent Claim
71 words
The shielded padlock of claim 2, wherein one of said pins comprises a plunger depressible into locking engagement with one of said cover plate recesses by one of said shackle legs upon depressing the shackle into a locked condition in the casing, and wherein a second of said pins comprises a set screw, threaded into said casing and turned down into locking engagement with the other of said cover plate recesses.
Claim 5
Dependent Claim
60 words
The shielded padlock of claim 3, wherein means affording release of said retaining means includes spring biasing means for said plunger to disengage the plunger from its locking engagement with said cover plate concurrently with the release of said shackle and withdrawal of one of said shackle legs from its related casing bore to provide access to said set screw.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |