Patent US3816899A successfully refreshed from Google Patents.
US3816899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock core puller for spring retained locks
Assignee: Individual
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Filing: 1972-05-30
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Granted: 1974-06-18
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Expires: 1992-05-30
Abstract
Abstract A device for removing a spring retained lock core from a lock without damage thereto comprising a threaded shaft having at one end a bit to be inserted in the keyway past a couple of lock pins, and a threaded crank on the other end adapted to bear on a pressure plate to withdraw the bit, lock mechanism and lock core from the lock.
Inventors
- 👤 G Kitts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:06
CPC Classifications
E; E05; E05B; E05B19/00; E05B19/20; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53796; Y10T29/53848; Y10T29/53857; Y10T29/53878
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A device for removing a spring retained core from a lock comprising an open-ended bearing cylinder having one end adapted to bear against the surface of a lock; a pressure plate having an aperture therein fixed to and partially closing the other end of said cylinder to form a viewing opening; a square threaded shaft extending through said aperture in alignment with the keyway of the core; an elongated tip terminating in an upwardly extending flange including a rearwardly facing shoulder detachably mounted to one end of said shaft for insertion into the keyway to engage behind a lock pin; and a nut mounted on the other end of said threaded shaft and engageable with said pressure plate to withdraw the core from the lock upon rotation of said nut.
Claim 2
Independent Claim
130 words
A device for removing a spring retained core from a lock comprising an open-ended bearing cylinder having one end adapted to bear against the surface of a lock; a pressure plate having an aperture therein fixed to and partially closing the other end of said cylinder to form a viewing opening; a square threaded shaft extending through said aperture in alignment with the keyway of the core; an elongated tip terminating in an upwardly extending flange including a rearwardly facing shoulder detachably mounted to one end of said shaft for insertion into the keyway to engage behind a lock pin; and a nut mounted on the other end of said threaded shaft and engageable with said pressure plate to withdraw the core from the lock upon rotation of said nut.
Claim 3
Independent Claim
151 words
A device for removing a spring retained core from a lock comprising, in combination, an open-ended bearing cylinder having one end adapted to be placed over closure knobs and handles and against bearing surfaces containing lock cores; a pressure plate having an aperture therein fixed to and partially closing the other end of said cylinder to form a viewing opening; a square threaded shaft of smallEr diameter than said aperture extending therethrough in alignment with the keyway of the core; an elongated tip terminating in an upwardly extending flange including a rearwardly facing shoulder detachably mounted on the inner end thereof for insertion into the keyway to engage behind a tumbler pin of the core; and a nut threadedly mounted on said threaded shaft and engageable upon rotation with the outer surface of said pressure plate to overcome the tension of the spring and withdraw the core of said lock therefrom.
Claim 4
Independent Claim
151 words
A device for removing a spring retained core from a lock comprising, in combination, an open-ended bearing cylinder having one end adapted to be placed over closure knobs and handles and against bearing surfaces containing lock cores; a pressure plate having an aperture therein fixed to and partially closing the other end of said cylinder to form a viewing opening; a square threaded shaft of smallEr diameter than said aperture extending therethrough in alignment with the keyway of the core; an elongated tip terminating in an upwardly extending flange including a rearwardly facing shoulder detachably mounted on the inner end thereof for insertion into the keyway to engage behind a tumbler pin of the core; and a nut threadedly mounted on said threaded shaft and engageable upon rotation with the outer surface of said pressure plate to overcome the tension of the spring and withdraw the core of said lock therefrom.
Claim 5
Dependent Claim
18 words
The combination recited in claim 1; and a leg mounted on said bearing cylinder as a supplement thereto.
Claim 6
Dependent Claim
20 words
The combination recited in claim 3 wherein said leg is adjustable to adapt said bearing cylinder to various bearing surfaces.
Claim 7
Dependent Claim
22 words
The combination recited in claim 2; and a leg mounted on said bearing cylinder for steadying it against closure and lock surfaces.
Claim 8
Dependent Claim
11 words
The combination recited in claim 5 wherein said leg is adjustable.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |