US3739611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tamper resistant lock
Assignee: Individual
•
Filing: 1972-07-31
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Granted: 1973-06-19
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Expires: 1992-07-31
Abstract
Abstract A tamper-proof key-operated lock is provided. The check point for the lock is displaced from the locked position, and the lock tumblers, while biased when the lock is in the locked position, are not biased at the check point. For preferred embodiments, a holding force is applied to the tumblers as they are moved from the locked position to the check point to prevent spurious movement of the tumblers. A one-piece, stationary biasing spring is also provided to reduce the cost of the lock.
Inventors
- 👤 V Ignatjev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:56
CPC Classifications
E; E05; E05B; E05B29/00; E05B15/00; E05B15/04; E05B2015/0458; E05B47/00; E05B47/0038; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7057; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7588; Y10T70/7593; Y10T70/7599; Y10T70/7915; Y10T70/7932
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
189 words
A lock of the type having an inner cylinder mounted for rotation in an outer cylinder between a locked and an unlocked position, and at least two tumblers supported for lateral movement in the inner cylinder, comprising: means operative when the inner cylinder is in said locked position for biasing each of said tumblers to a lateral position where they project from said inner cylinder; said tumblers moving away from the influence of said biasing means as the inner cylinder is moved from said locked position toward said unlocked position; means forming part of each tumbler for coacting with a proper key inserted in the lock to move each tumbler against the action of said biasing means to a lateral position in which it does not project from said inner cylinder; and means operative when said inner cylinder has been rotated to a position where the tumblers are no longer influenced by said biasing means for testing to determine if any of said tumblers is projecting from the inner cylinder and for preventing the inner cylinder from being rotated to the unlocked position if any tumbler is found projecting.
Claim 2
Dependent Claim
189 words
A lock of the type having an inner cylinder mounted for rotation in an outer cylinder between a locked and an unlocked position, and at least two tumblers supported for lateral movement in the inner cylinder, comprising: means operative when the inner cylinder is in said locked position for biasing each of said tumblers to a lateral position where they project from said inner cylinder; said tumblers moving away from the influence of said biasing means as the inner cylinder is moved from said locked position toward said unlocked position; means forming part of each tumbler for coacting with a proper key inserted in the lock to move each tumbler against the action of said biasing means to a lateral position in which it does not project from said inner cylinder; and means operative when said inner cylinder has been rotated to a position where the tumblers are no longer influenced by said biasing means for testing to determine if any of said tumblers is projecting from the inner cylinder and for preventing the inner cylinder from being rotated to the unlocked position if any tumbler is found projecting.
Claim 3
Dependent Claim
35 words
A lock as claimed in claim 1 including means operative as said inner cylinder is moved by the key from said locked to said unlocked position for holding each tumbler in its existing lateral position.
Claim 4
Dependent Claim
31 words
A lock as claimed in claim 2 wherein said tumbler holding means is a magnet mounted in said inner cylinder adjacent said tumblers, the tumblers being formed of a magnetic material.
Claim 5
Dependent Claim
15 words
A lock as claimed in claim 3 wherein said magnet is a flexible plastic magnet.
Claim 6
Dependent Claim
24 words
A lock as claimed in claim 2 wherein said tumbler holding means includes means for applying a frictional force to each of said tumblers.
Claim 7
Dependent Claim
25 words
A lock as claimed in claim 5 wherein said means for applying a frictional force includes at least one spring mounted in said inner cylinder.
Claim 8
Dependent Claim
76 words
A lock as claimed in claim 1 wherein said inner cylinder is mounted in a bore in said outer cylinder, said bore having a pair of recesses on opposite sides thereof, at least in the area of the bore adjacent said tumblers, which extend from the position of an extending tumbler when the inner cylinder is in the unlocked position to the position of an extending tumbler when the inner cylinder is in the testing position.
Claim 9
Dependent Claim
39 words
A lock as claimed in claim 7 wherein each recess ends in a shoulder at the testing positions end thereof, said shoulder coacting with an extending tumbler to prevent the inner cylinder from being rotated to the unlocked position.
Claim 10
Dependent Claim
31 words
A lock as claimed in claim 7 wherein said outer cylinder includes a hollow cylinder having a slotted insert mounted therein, the slots in said insert forming said pair of recesses.
Claim 11
Dependent Claim
34 words
A lock as claimed in claim 1 wherein said biasing means is a magnet mounted in said outer cylinder in a position adjacent said tumblers when the inner cylinder is in the locked position.
Claim 12
Dependent Claim
31 words
A lock as claimed in claim 1 wherein said biasing means is a single comb-shaped spring mounted in said outer cylinder, said spring having a tine for each of said tumblers.
Claim 13
Dependent Claim
60 words
A lock as claimed in claim 11 wherein each of said tines is shaped to cam the corresponding tumbler to a position projecting from the bottom of inner cylinder as the inner cylinder is moved from the unlocked to the locked position and to bias the tumber to that position only when the inner cylinder is in the locked position.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |