US3835674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locks
Assignee: Olson Manufacturing Co
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Filing: 1973-04-20
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Granted: 1974-09-17
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Expires: 1993-04-20
Abstract
Abstract This device is a bolt type lock for preventing tampering with gas and electric meters. A hollow body with a fixed head on one end has a cap held onto the other end by locking means held extended into the cap by a spring-loaded plunger retractible solely through a small round key hole in the head, to unlock the lock. If any tool but the authorised key is used to pull the plunger, a piece that is normally left behind when the genuine key is used is brought into position in place of the plunger and keeps the locking means extended and the lock locked.
Inventors
- 👤 R Hoyt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:46
CPC Classifications
E; E05; E05B; E05B67/00; E05B67/36; E05B67/365; Y; Y10; Y10T; Y10T70/00; Y10T70/40; Y10T70/413; Y10T70/437; Y10T70/439; Y10T70/443
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
A lock having a tubular body, radially extendible locking members thereon, a spring-biased plunger therein actuating such members and retractable clear of the locking members, and means within the body adapted to hold the locking members extended when the plunger is withdrawn from actuating relation with suCh members by wedging means engaging both the plunger and the said means.
Claim 2
Dependent Claim
59 words
A lock having a tubular body, radially extendible locking members thereon, a spring-biased plunger therein actuating such members and retractable clear of the locking members, and means within the body adapted to hold the locking members extended when the plunger is withdrawn from actuating relation with suCh members by wedging means engaging both the plunger and the said means.
Claim 3
Dependent Claim
18 words
A lock according to claim 1 in which the said means alternatively holds and releases the locking members.
Claim 4
Dependent Claim
34 words
A lock according to claim 1 in which the said means moves with the plunger to hold the locking members in locking relation and moves relatively to the plunger to release the locking members.
Claim 5
Dependent Claim
24 words
A lock according to claim 3 in which the said means remains at rest with respect to the plunger to release the locking members.
Claim 6
Dependent Claim
24 words
A lock according to claim 1 in which the plunger has an axial bore and the said means is relatively movable in such bore.
Claim 7
Dependent Claim
24 words
A lock according to claim 5 in which the said means holds the locking members extended when it and the plunger move in unison.
Claim 8
Dependent Claim
38 words
A lock according to claim 5 in which the said means is relatively movable with respect to the plunger and ceases to hold the locking members extended upon independent movement of the plunger with respect to such means.
Claim 9
Dependent Claim
47 words
A lock according to claim 1 in which the plunger has an axial bore and the said means has a shank slidable in such bore and a head extending beyond the bore engaging the locking members when the plunger is withdrawn from actuating relation with such members.
Claim 10
Dependent Claim
26 words
A lock according to claim 8 in which differential movement between the plunger and the shank keeps the head out of engagement with the locking members.
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 |