US3751949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking device
Assignee: Individual
•
Filing: 1971-10-01
•
Granted: 1973-08-14
•
Expires: 1991-10-01
Abstract
Abstract The lock includes a spring projected, tool retracted, closure carried, sliding bolt which is improved by providing a crosschannel in the sliding bolt and opening the ends of the helical compression spring surrounding the bolt. The open spring ends form feet which urge the bolt away from its support bracket and force the channel into engagement with the lock housing to prevent longitudinal movement of the bolt. The lock is also arranged to actuate a pivot arm which controls the sliding movement of two secondary bolts to provide a three-point locking device.
Inventors
- 👤 A Castle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:00
CPC Classifications
E; E05; E05C; E05C1/00; E05C1/08; E05C1/12; E05C1/14; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/0834; Y10T292/0836; Y10T292/0839; Y10T292/0886; Y10T292/0887; Y10T292/0889; Y10T292/089; Y10T292/096; Y10T292/0969; Y10T292/097; Y10T292/0977; Y10T292/0982; Y10T292/0994; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/5199; Y10T70/5372; Y10T70/5385; Y10T70/70; Y10T70/7441; Y10T70/778; Y10T70/7791
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
323 words
A locking mechanism comprising: a primary bolt having a longitudinal axis and a forward end arranged for latching a keeper structure; support means supporting said bolt for sliding displacement along said axis; stop means for limiting the axial displacement of said bolt in one direction; and bias means for continuously urging said bolt in said one direction; said bolt having a slot defined therein extending a predetermined distance along the length of the bolt, said slot having an inclined end wall remote from said forward end, said inclined end wall defining a shorter slot length proximate a first side of said bolt than proximate the opposite side of said bolt; said support means having an entrance opening for a key, said entrance opening being proximate said first side of said bolt in registration with said slot and having a length which is shorter than said shorter slot length; said bolt additionally including a channel defined in said opposite side of said bolt in a transverse direction relative to said axis, said channel being positioned along said bolt to be in registration with a predetermined segment of said support means when said bolt is displaced to its extreme position in said one direction, the width of said channel being slightly greater than the length of said predetermined segment; and further bias means for continously urging said bolt transversely in the direction of said opposite side to force said channel to engage said predetermined segment when said bolt is extended to its extreme position in said one direction; whereby displacement of said bolt opposite said one direction requires a tool having a curved end section to be inserted through said entrance opening and into said slot, said tool to be pivoted to force said curved end section to engage said inclIned wall to both disengage said channel from said predetermined segment of said support means and slide said bolt in opposition to said bias means.
Claim 2
Dependent Claim
323 words
A locking mechanism comprising: a primary bolt having a longitudinal axis and a forward end arranged for latching a keeper structure; support means supporting said bolt for sliding displacement along said axis; stop means for limiting the axial displacement of said bolt in one direction; and bias means for continuously urging said bolt in said one direction; said bolt having a slot defined therein extending a predetermined distance along the length of the bolt, said slot having an inclined end wall remote from said forward end, said inclined end wall defining a shorter slot length proximate a first side of said bolt than proximate the opposite side of said bolt; said support means having an entrance opening for a key, said entrance opening being proximate said first side of said bolt in registration with said slot and having a length which is shorter than said shorter slot length; said bolt additionally including a channel defined in said opposite side of said bolt in a transverse direction relative to said axis, said channel being positioned along said bolt to be in registration with a predetermined segment of said support means when said bolt is displaced to its extreme position in said one direction, the width of said channel being slightly greater than the length of said predetermined segment; and further bias means for continously urging said bolt transversely in the direction of said opposite side to force said channel to engage said predetermined segment when said bolt is extended to its extreme position in said one direction; whereby displacement of said bolt opposite said one direction requires a tool having a curved end section to be inserted through said entrance opening and into said slot, said tool to be pivoted to force said curved end section to engage said inclIned wall to both disengage said channel from said predetermined segment of said support means and slide said bolt in opposition to said bias means.
Claim 3
Dependent Claim
90 words
The locking mechanism according to claim 1 wherein said bias means comprises a helical compression spring coiled about a portion of said bolt and held in compression between a portion of said support means and a portion of said bolt, and wherein said further bias means includes opposite ends of said helical spring extending away from said bolt at said first side of said bolt and into compressed engagement with said support means whereby to urge said helical spring and the surrounded bolt in the direction of said opposite side.
Claim 4
Dependent Claim
100 words
The locking mechanism according to claim 2 further comprising: a pivot arm mounted for pivotal movement about a fixed point; a secondary bolt having a longitudinal axis and a forward end arranged to latch a secondary keeper structure; means supporting said secondary bolt for sliding displacement along its axis; linkage means linking said pivot arm to said secondary bolt to effect sliding movement of said secondary bolt relative to said secondary keeper in response to pivotal movement of said pivot arm; and means for pivoting said pivot arm in response to sliding movement of said primary bolt along its axis.
Claim 5
Dependent Claim
77 words
The locking mechanism according to claim 3 further comprising: a further secondary bolt having a longitudinal axis and a forward end arranged to latch a further secondary keeper structure; means supporting said further secondary bolt for sliding displacement along its axis; and linkage means linking said pivot arm to said further secondary bolt to effect sliding movement of said further secondary bolt relative to said further secondary keeper in response to pivotal movement of said pivot arm.
Claim 6
Dependent Claim
41 words
The locking device according to claim 4 wherein said primary and two secondary bolts are mounted on a surface of the same door to provide a three-point closure, said bolts each being extensible beyond a different respective edge of said door.
Claim 7
Dependent Claim
100 words
The locking mechanism according to claim 1 further comprising: a pivot arm mounted for pivotal movement about a fixed point; a secondary bolt having a longitudinal axis and a forward end arranged to latch a secondary keeper structure; means supporting said secondary bolt for sliding displacement along its axis; linkage means linking said pivot arm to said secondary bolt to effect sliding movement of said secondary bolt relative to said secondary keeper in response to pivotal movement of said pivot arm; and means for pivoting said pivot arm in response to sliding movement of said primary bolt along its axis.
Claim 8
Dependent Claim
77 words
The locking mechanism according to claim 6 further comprising: a further secondary bolt having a longitudinal axis and a forward end arraned to latch a further secondary keeper structure; means supporting said further secondary bolt for sliding displacement along its axis; and linkage means linking said pivot arm to said further secondary bolt to effect sliding movement of said further secondary bolt relative to said further secondary keeper in response to pivotal movement of said pivot arm.
Claim 9
Dependent Claim
53 words
The locking mechanism according to claim 1 wherein said bias means comprises a helical compression spring coiled about a portion of said bolt and held in compression between a portion of said support means and a portion of said bolt, and wherein said further bias means includes a portion of said helical spring.
Claim 10
Dependent Claim
37 words
The locking mechanism according to claim 8 wherein said portion of said helical spring includes at least one end of said helical spring postioned to urge said bolt transversely toward said predetermined segment of said support means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |