US4143531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable core for lock cylinder
Assignee: Sargent Manufacturing Co
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Filing: 1977-12-28
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Granted: 1979-03-13
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Expires: 1997-12-28
Abstract
Abstract A disposable plug assembly to be used as a substitute for the removable core in a lock cylinder, as during the construction of a building, prior to installation of the final cores, the disposable core including a part which can be used to operate a cam or tail on the cylinder for actuating a latch bolt.
Inventors
- 👤 Alfred E. Floyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:43
CPC Classifications
E; E05; E05B; E05B17/00; E05B17/0012; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7638
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A disposable plug assembly for use in place of the core of a removable core lockset having a figure-8 shaped core cylinder cavity and latch actuating core engaging means in the lower portion of said cavity, the plug assembly comprising a main plastic cylindrical element having inner and outer ends and adapted to have a friction fit in said lower portion, said element having its inner end shaped to engage the core engaging means, and its outer end being solid and provided with means for engagement by an operating device for rotation of said element and actuation of a latch.
Claim 2
Dependent Claim
100 words
A disposable plug assembly for use in place of the core of a removable core lockset having a figure-8 shaped core cylinder cavity and latch actuating core engaging means in the lower portion of said cavity, the plug assembly comprising a main plastic cylindrical element having inner and outer ends and adapted to have a friction fit in said lower portion, said element having its inner end shaped to engage the core engaging means, and its outer end being solid and provided with means for engagement by an operating device for rotation of said element and actuation of a latch.
Claim 3
Dependent Claim
27 words
A disposable plug assembly according to claim 1 wherein said main cylindrical element is axially and diametrically slotted from its inner end toward its solid outer end.
Claim 4
Dependent Claim
31 words
A disposable plug assembly according to claim 1 wherein the core engaging means are axially extending parallel pins and the main cylindrical element is provided with holes to receive said pins.
Claim 5
Dependent Claim
38 words
A disposable plug assembly according to claim 2 wherein the core engaging means are axially extending parallel pins and the main cylindrical element is provided with holes on each side of the axial slot to receive said pins.
Claim 6
Dependent Claim
23 words
A disposable plug assembly according to claim 1 wherein said main cylindrical element is provided with an annular collar near its outer end.
Claim 7
Dependent Claim
27 words
A disposable plug assembly according to claim 5 wherein the means for engagement is constituted by a kerf in the solid outer end of the cylindrical element.
Claim 8
Dependent Claim
46 words
A disposable plug assembly according to claim 1 which includes a separate plastic filler plug adapted to fit in the upper portion of the cavity and shaped to cooperate with the main cylindrical element in filling at least the outer portion of said core cylinder cavity.
Claim 9
Dependent Claim
37 words
A disposable plug assembly according to claim 7 wherein the filler plug has a cylindrical body provided with a longitudinal recess arcuately profiled on a radius equal to the radius of the lower portion of the cavity.
References Cited (Backward Citations)
US3715899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |