US3720085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pick proof lock
Assignee: Individual
•
Filing: 1971-09-13
•
Granted: 1973-03-13
•
Expires: 1991-09-13
Abstract
Abstract A pick proof lock assembly in which an annular housing or body member having a plurality of axial grooves telescopically receives a cylinder having rows of radially extending lug projections receivable in the body grooves. The cylinder is connected to a bolt actuating mechanism in any conventional manner with rotation of the cylinder in the body effecting bolt movement for locking and unlocking a door. The cylinder is normally prevented from rotation in the body by engagement of one or more of the lug projections with the side walls of the grooves. A key is used to axially move selected ones of the key projections into alignment with transaxial peripheral notches communicating with an associated groove, and when so aligned, further key rotation will permit rotation of the cylinder for unlocking operation. The non-selected projections will already be normally aligned with such peripheral notches. As a further feature, a plurality of short dummy peripheral notches may be provided which are normally aligned with the selected operative lug projections, such notches not being sufficiently long to permit operative cylinder rotation, but their presence is intended to thwart any person attempting to pick the lock, since such person could not ascertain whether a lug projection was aligned with an operative or a dummy notch.
Inventors
- 👤 M Zucca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:15
CPC Classifications
E; E05; E05B; E05B35/00; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7565; Y10T70/7588; Y10T70/7593; Y10T70/778; Y10T70/7791; Y10T70/7842; Y10T70/7847; Y10T70/7915; Y10T70/7932
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
214 words
A lock including an outer tubular housing, defining a longitudinally extending cylindrical bore, and a cylinder with a central axial bore rotatably mounted and axially fixed within said housing bore, said housing having at least one longitudinally extending groove formed in said housing in communication with said housing bore and extending toward but terminating short of the outer surface of said housing, at least one set of axially spaced transaxial peripherally extending primary notches formed in said housing in communication with said housing bore and with said groove, at least one set of axially spaced transaxial peripherally extending secondary notches formed in said housing in communication with said housing bore and with said groove and each being axially spaced from a corresponding primary notch, said secondary notches extending a lesser peripheral distance from said groove than said primary notches, said cylinder having at least one set of axially aligned and axially spaced radial lugs extending outwardly and into said groove and selective ones thereof normally being axially offset from corresponding primary notches, inner portions of said lugs extending into said cylinder axial bore, said lugs being each capable of independent axial displacement relative to said cylinder, and means for moving said selective ones of said lugs axially into registration with the corresponding primary notches.
Claim 2
Dependent Claim
214 words
A lock including an outer tubular housing, defining a longitudinally extending cylindrical bore, and a cylinder with a central axial bore rotatably mounted and axially fixed within said housing bore, said housing having at least one longitudinally extending groove formed in said housing in communication with said housing bore and extending toward but terminating short of the outer surface of said housing, at least one set of axially spaced transaxial peripherally extending primary notches formed in said housing in communication with said housing bore and with said groove, at least one set of axially spaced transaxial peripherally extending secondary notches formed in said housing in communication with said housing bore and with said groove and each being axially spaced from a corresponding primary notch, said secondary notches extending a lesser peripheral distance from said groove than said primary notches, said cylinder having at least one set of axially aligned and axially spaced radial lugs extending outwardly and into said groove and selective ones thereof normally being axially offset from corresponding primary notches, inner portions of said lugs extending into said cylinder axial bore, said lugs being each capable of independent axial displacement relative to said cylinder, and means for moving said selective ones of said lugs axially into registration with the corresponding primary notches.
Claim 3
Dependent Claim
214 words
A lock including an outer tubular housing, defining a longitudinally extending cylindrical bore, and a cylinder with a central axial bore rotatably mounted and axially fixed within said housing bore, said housing having at least one longitudinally extending groove formed in said housing in communication with said housing bore and extending toward but terminating short of the outer surface of said housing, at least one set of axially spaced transaxial peripherally extending primary notches formed in said housing in communication with said housing bore and with said groove, at least one set of axially spaced transaxial peripherally extending secondary notches formed in said housing in communication with said housing bore and with said groove and each being axially spaced from a corresponding primary notch, said secondary notches extending a lesser peripheral distance from said groove than said primary notches, said cylinder having at least one set of axially aligned and axially spaced radial lugs extending outwardly and into said groove and selective ones thereof normally being axially offset from corresponding primary notches, inner portions of said lugs extending into said cylinder axial bore, said lugs being each capable of independent axial displacement relative to said cylinder, and means for moving said selective ones of said lugs axially into registration with the corresponding primary notches.
Claim 4
Dependent Claim
214 words
A lock including an outer tubular housing, defining a longitudinally extending cylindrical bore, and a cylinder with a central axial bore rotatably mounted and axially fixed within said housing bore, said housing having at least one longitudinally extending groove formed in said housing in communication with said housing bore and extending toward but terminating short of the outer surface of said housing, at least one set of axially spaced transaxial peripherally extending primary notches formed in said housing in communication with said housing bore and with said groove, at least one set of axially spaced transaxial peripherally extending secondary notches formed in said housing in communication with said housing bore and with said groove and each being axially spaced from a corresponding primary notch, said secondary notches extending a lesser peripheral distance from said groove than said primary notches, said cylinder having at least one set of axially aligned and axially spaced radial lugs extending outwardly and into said groove and selective ones thereof normally being axially offset from corresponding primary notches, inner portions of said lugs extending into said cylinder axial bore, said lugs being each capable of independent axial displacement relative to said cylinder, and means for moving said selective ones of said lugs axially into registration with the corresponding primary notches.
Claim 5
Dependent Claim
20 words
A lock as set forth in claim 1 including spring means normally urging said lugs into said normal offset positions.
Claim 6
Dependent Claim
54 words
A lock as set forth in claim 1 in which said last named means includes a key insertable in said cylinder bore, said key comprising a shaft having at least one ramplike cam projection on the periphery of said shaft, said cam projection being engageable with an inner portion of one of said lugs.
Claim 7
Dependent Claim
55 words
A lock as set forth in claim 1 in which said housing is provided with A plurality of said grooves, a plurality of said sets of primary and secondary notches extending from the respective grooves, and a plurality of said sets of lugs on said cylinder in circumferentially spaced relation disposed within the respective grooves.
Claim 8
Dependent Claim
38 words
A lock as set forth in claim 4 in which selected ones of said lugs are aligned with selected ones of said primary notches and other of said lugs are normally axially offset from their adjacent primary notches.
Claim 9
Dependent Claim
52 words
A lock as set forth in claim 5 in which said housing is provided with a plurality of said sets of said secondary notches, each notch extending a lesser distance from its respective groove than said primary notches, and in which said other of said lugs are aligned with said secondary notches.
Claim 10
Dependent Claim
48 words
A lock as set forth in claim 5 in which said cylinder is provided with a plurality of sets of axial slots, said slots being in alignment with said grooves, said lugs extending through said slots, and one end of each slot being adjacent to a primary notch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |