US3713311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detachably fixed cylinder lock core
Assignee: MEDCO SECURITY LOCK Inc
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Filing: 1971-05-28
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Granted: 1973-01-30
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Expires: 1991-05-28
Abstract
Abstract A cylinder lock core mechanism for insertion into and becoming detachably fixed to a lock housing under control of a special key operating upon a special tumbler in the key plug, the core being retained by a slidable retaining lug emerging through the surface of the core and being retractable by operation of the special key''s rotation to cause the tumbler to coact with the retaining lug permitting the core to be withdrawn from the housing including a deadlock member coacting with the retaining lug under control of the key plug and guiding studs in the core structure whereby the member is cammed to free the retainer for movement only upon rotation of the key plug by the special key.
Inventors
- 👤 R Oliver
- 👤 R Spain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:38
CPC Classifications
E; E05; E05B; E05B9/00; E05B9/08; E05B9/084; E05B9/086; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7638; Y10T70/765
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A cylinder lock core capable of being detachably fixed within a lock housing comprising a key plug, a slidable retainer for engaging a recessed portion of said housing, said retainer being constrained within said core by a pair of guiding studs and said key plug, a tumbler within said key plug capable of being displaced by introduction of a key into said plug to engage and move said retainer upon rotation of said key, and a member coupled to said retainer for locking positively said retainer against random movement.
Claim 2
Dependent Claim
89 words
A cylinder lock core capable of being detachably fixed within a lock housing comprising a key plug, a slidable retainer for engaging a recessed portion of said housing, said retainer being constrained within said core by a pair of guiding studs and said key plug, a tumbler within said key plug capable of being displaced by introduction of a key into said plug to engage and move said retainer upon rotation of said key, and a member coupled to said retainer for locking positively said retainer against random movement.
Claim 3
Dependent Claim
89 words
A cylinder lock core capable of being detachably fixed within a lock housing comprising a key plug, a slidable retainer for engaging a recessed portion of said housing, said retainer being constrained within said core by a pair of guiding studs and said key plug, a tumbler within said key plug capable of being displaced by introduction of a key into said plug to engage and move said retainer upon rotation of said key, and a member coupled to said retainer for locking positively said retainer against random movement.
Claim 4
Dependent Claim
89 words
A cylinder lock core capable of being detachably fixed within a lock housing comprising a key plug, a slidable retainer for engaging a recessed portion of said housing, said retainer being constrained within said core by a pair of guiding studs and said key plug, a tumbler within said key plug capable of being displaced by introduction of a key into said plug to engage and move said retainer upon rotation of said key, and a member coupled to said retainer for locking positively said retainer against random movement.
Claim 5
Dependent Claim
20 words
The invention claimed in claim 1 wherein said coupling member is confined between said guiding studs and said key plug.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |