US3869943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-ejecting chuck key
Assignee: BUCK TOOL Co
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Filing: 1973-07-19
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Granted: 1975-03-11
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Expires: 1993-07-19
Abstract
Abstract A self-ejecting key for a machine tool chuck. For cooperation with a rotatable machine tool chuck, said chuck having a noncircular opening in a side thereof for the reception of a mating noncircular key for the opening and closing of said chuck, there is provided an appropriate key having a generally cylindrical portion terminating in a suitable noncircular portion for reception into said chuck opening. A coil spring is sleeved over the noncircular portion and anchored suitably in the cylindrical portion, the free circular end thereof terminating adjacent the free end of the noncircular portion of the key. Thus, when the key is inserted into the chuck opening the spring will compress and the key can function in a normal manner. When the operator releases the key the spring will automatically eject the key from the opening whereby to insure that the key will not inadvertently be left in the opening.
Inventors
- 👤 James R Buck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:28
CPC Classifications
B; B25; B25B; B25B33/00; B25B33/005; Y; Y10; Y10T; Y10T279/00; Y10T279/34; Y10T279/3431; Y10T279/3437
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
288 words
A self-ejecting chuck key adapted for introduction into a mating opening within the operating mechanism of a chuck, said key comprising: a substantially cylindrical shank portion adapted to have a transversely extending handle fixedly or removably connected to one end thereof; a cylindrical nose portion projecting outwardly from and fixedly connected to the other end of said shank portion, said nose portion having a diameter which is substantially smaller than the diameter of said shank portion; said nose portion having a plurality of flats formed thereon adjacent the free end thereof, said flats resulting in said nose portion having a noncircular part adjacent the free end thereof which is adapted to be inserted into the mating opening within the operating mechanism of a chuck; a tapering and generally conical connecting portion fixedly connecting said shank portion and said nose portion, said connecting portion tapering outwardly in a diverging manner as it extends in a direction from said nose portion toward said shank portion, said connecting portion having an annular groove formed therein and encircling same, said annular groove being spaced intermediate the ends of said connecting portion and resulting in the formation of an annular tapered projection positioned between said groove and said cylindrical nose portion, said annular projection having a diameter greater than the diameter of said cylindrical nose portion; and a standard coil spring having coils of uniform diameter encircling said nose portion over substantially the entire length thereof, one end of said coil spring being disposed at a point at least closely adjacent the free end of said nose portion, and the other end of said spring having an end coil thereof disposed within said groove for fixedly anchoring said other end of said spring.
Claim 2
Dependent Claim
288 words
A self-ejecting chuck key adapted for introduction into a mating opening within the operating mechanism of a chuck, said key comprising: a substantially cylindrical shank portion adapted to have a transversely extending handle fixedly or removably connected to one end thereof; a cylindrical nose portion projecting outwardly from and fixedly connected to the other end of said shank portion, said nose portion having a diameter which is substantially smaller than the diameter of said shank portion; said nose portion having a plurality of flats formed thereon adjacent the free end thereof, said flats resulting in said nose portion having a noncircular part adjacent the free end thereof which is adapted to be inserted into the mating opening within the operating mechanism of a chuck; a tapering and generally conical connecting portion fixedly connecting said shank portion and said nose portion, said connecting portion tapering outwardly in a diverging manner as it extends in a direction from said nose portion toward said shank portion, said connecting portion having an annular groove formed therein and encircling same, said annular groove being spaced intermediate the ends of said connecting portion and resulting in the formation of an annular tapered projection positioned between said groove and said cylindrical nose portion, said annular projection having a diameter greater than the diameter of said cylindrical nose portion; and a standard coil spring having coils of uniform diameter encircling said nose portion over substantially the entire length thereof, one end of said coil spring being disposed at a point at least closely adjacent the free end of said nose portion, and the other end of said spring having an end coil thereof disposed within said groove for fixedly anchoring said other end of said spring.
References Cited (Backward Citations)
US2598119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |