Expanding collet assembly

Chucks or sockets – Expanding – Collet type

Patent

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Details

279156, 279157, B23B 3140

Patent

active

053971353

ABSTRACT:
An expanding collet assembly comprises an arbor having a flange portion for securing to a machine tool spindle and a shaft portion extending from the flange portion. The shaft portion includes a first conical surface disposed at its free end and a second conical surface disposed adjacent the flange portion. Conical surfaces are parallel to each other and disposed radially inwardly in the direction away from the flange portion. An expanding collet having alternately disposed slots to form a plurality of fingers extend inwardly from opposite collet ends and have inner conical surfaces at the collet ends that cooperate with the first and second conical surfaces. The expanding collet is axially slidably disposed around the shaft portion between a relaxed position when the collet is disposed away from the flange portion and an expanded position when disposed toward the flange portion. A draw plug with a flanged head in engagement with one end of the collet is disposed axially through the arbor in an opening in the shaft portion. A draw bar adapter is disposed within a recess in the arbor and secures one end of the draw plug, the adapter being secured to a draw bar for axially actuating the draw plug, thereby actuating the collet. An annular work locating stop is secured to the flange portion and overlies at least a portion of the collet, the stop having an annular free edge for abutting against a workpiece. Another embodiment of the expanding collet assembly for smaller workpieces is also disclosed.

REFERENCES:
patent: 2228685 (1941-01-01), Benjamin
patent: 2360968 (1944-10-01), Mundy
patent: 2383036 (1945-08-01), Benjamin et al.
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patent: 2462155 (1949-02-01), Benjamin et al.
patent: 2465836 (1949-03-01), Benjamin
patent: 2515183 (1950-07-01), Benjamin et al.
patent: 2672789 (1954-03-01), Cross et al.
patent: 2890055 (1959-06-01), Garrison
patent: 3156478 (1964-11-01), Lamusga
patent: 3819195 (1974-06-01), Lehde, Jr. et al.
patent: 4602798 (1986-07-01), Wettstein
patent: 5096213 (1992-03-01), Terwilliger et al.
Paul Forkardt, Forkardt Chucking Technique International Expanding Manderels and Collet Chucks, Nov. 1988.

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