Chucks or sockets – Socket type – Radially reciprocating jaws
Patent
1993-11-02
1994-10-11
Bishop, Steven C.
Chucks or sockets
Socket type
Radially reciprocating jaws
279 30, 279131, 279902, B23B 31171
Patent
active
053540751
ABSTRACT:
A keyless drill chuck apparatus includes a tubular body having a longitudinal bore that includes first and second bore sections. The first bore section is of a smaller diameter and is closer to the proximal end portion of the drill, that end portion that is connected to a tool driver, motor or the like. The second bore section is larger diameter portion that is opened ended. A pair of bearing supports are positioned at the two bore sections. Each of the bearing holders carriers a plurality of conically-shaped bearing members. During use, a drill bit can be placed in either of the bore sections and into engagement with one of the selected sets of bearing. During use, different diameter drill bits and thus be placed as desired in the smaller or larger bore section and into engagement with the first or second set of bearing. Scalloped portions of the tool body adjacent each of the bores are provided in a corresponding number to the number of bearings. Each of the bearings registers in one of the scalloped portions. During use, rotational energy is transmitted between the tool body and the drill bit via the conical bearing. Each bearing bites into a scalloped portion and into the drill bit. Because of the scalloped portion provides a dished surface, the bite is greater as the drill attempts to rotate relative to the tool body.
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patent: 5171313 (1992-12-01), Salyer
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patent: 5222956 (1993-06-01), Waldron et al.
Marik Gregory C.
Roberson, Jr. Raymond H.
Bishop Steven C.
Smith & Nephew Richards Inc.
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