US4426864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinder lock
Assignee: Tokai Rika Co Ltd
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Filing: 1981-10-09
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Granted: 1984-01-24
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Expires: 2001-10-09
Abstract
Abstract A cylinder lock including a rotor casing formed with a groove and an elongated through-opening, a rotor rotatably received in the rotor casing, tumblers which are respectively formed with projecting ends engageable with the groove and slidably fitted into the rotor, a tumbler blocking member slidably inserted into the elongated through-opening, a plunger and a plunger driving device. By the above arrangement, the cylinder lock can be positively unlocked either by using a key or without using the key and instead using the plunger driving device and driving the tumbler blocking member.
Inventors
- 👤 Minoru Morikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:14
CPC Classifications
E; E05; E05B; E05B47/00; E05B47/06; E05B47/0611; E05B47/0619; E05B47/0626; E05B47/063; B; B60; B60R; B60R25/00; B60R25/01; B60R25/02; B60R25/021; B60R25/0211; E05B47/0001; E05B47/0002; E05B47/0003; E05B47/0004; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7051; Y10T70/7062; Y10T70/7107; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7588; Y10T70/7593; Y10T70/7599; Y10T70/778; Y10T70/80
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
224 words
A cylinder lock which can be unlocked either by using a key or without using a key, said cylinder lock comprising: a rotor casing having a groove in the inner surface of a side wall of said rotor casing and extending parallel to the axis of said casing, and further having an elongated through opening in the side wall of said rotor casing communicating with said groove; a rotor rotatably received in said rotor casing and having a keyhole therein and having a knob fixedly provided on the outer end thereof; tumblers slidably fitted into said rotor and having projecting ends selectively engaged in and disengaged from said groove when a key is withdrawn from and inserted into said keyhole, respectively; a tumbler blocking member slidably positioned in said elongated through-opening in said rotor casing; a plunger driving device mounted in a predetermined position on the outer surface of said side wall of said rotor casing and having a plunger driven thereby and opposed to said tumbler blocking member, whereby said tumblers are pushed into said rotor by said tumbler blocking member when said plunger is thrust towards said tumbler blocking member by said plunger driving device and said projecting ends of said tumblers are disengaged from said groove in said rotor casing for permitting said rotor to be turned by turning said knob.
Claim 2
Dependent Claim
224 words
A cylinder lock which can be unlocked either by using a key or without using a key, said cylinder lock comprising: a rotor casing having a groove in the inner surface of a side wall of said rotor casing and extending parallel to the axis of said casing, and further having an elongated through opening in the side wall of said rotor casing communicating with said groove; a rotor rotatably received in said rotor casing and having a keyhole therein and having a knob fixedly provided on the outer end thereof; tumblers slidably fitted into said rotor and having projecting ends selectively engaged in and disengaged from said groove when a key is withdrawn from and inserted into said keyhole, respectively; a tumbler blocking member slidably positioned in said elongated through-opening in said rotor casing; a plunger driving device mounted in a predetermined position on the outer surface of said side wall of said rotor casing and having a plunger driven thereby and opposed to said tumbler blocking member, whereby said tumblers are pushed into said rotor by said tumbler blocking member when said plunger is thrust towards said tumbler blocking member by said plunger driving device and said projecting ends of said tumblers are disengaged from said groove in said rotor casing for permitting said rotor to be turned by turning said knob.
Claim 3
Dependent Claim
39 words
A cylinder lock as claimed in claim 1 further comprising spring means urging said tumblers toward engagement of said projecting ends in said groove and urging said tumbler blocking member radially outwardly of said rotor casing toward said plunger.
Claim 4
Dependent Claim
39 words
A cylinder lock as claimed in claim 2 in which said spring means comprise first springs engaged with said tumblers for urging said tumblers and second springs engaged with said tumbler blocking member for urging said tumbler blocking member.
Claim 5
Dependent Claim
16 words
A cylinder lock as claimed in claim 1, wherein said plunger driving device is a solenoid.
Claim 6
Dependent Claim
17 words
A cylinder lock as claimed in claim 1, wherein said plunger driving device is an electric motor.
Claim 7
Dependent Claim
24 words
A cylinder lock as claimed in claim 1, wherein said plunger driving device is a mechanical device coupled with the plunger by a wire.
References Cited (Backward Citations)
US1476841A
Cited
US2061638A
Cited
GB657385A
Cited
US2879658A
Cited
US3241344A
Cited
US3304755A
Cited
US3670538A
Cited
US3705507A
Cited
US3894417A
Cited
FR2450930B1
Cited
GB2071197B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |