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Chuck assembly for tool bits

  • US 5,013,194 A
  • Filed: 02/06/1990
  • Issued: 05/07/1991
  • Est. Priority Date: 09/08/1988
  • Status: Expired due to Term
First Claim
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1. A quick release chuck assembly for a tool bit having a shank and a groove extending circumferentially about the shank with a radiused portion, the chuck assembly comprising:

  • a spindle including,a forward face,a longitudinal bore into the spindle from the forward face having an inner end for receiving the shank of the tool bit,at least a first radial bore communicating with the longitudinal bore through the spindle, anda detent ball disposed in each radial bore and extendable into the longitudinal bore against the groove of the shank of the tool bit;

    a sleeve disposed around the spindle including,a forward bore disposed around the spindle for receiving the detent balls when the balls are moved out of the longitudinal bore,a radially inwardly extending shoulder adjacent the forward bore for engaging and urging the balls into the longitudinal bore and against the groove of the shank,the shoulder further including a substantially minimum diameter center bore permitting free translation of the sleeve around the spindle and a concentrically graduated portion between the forward bore and the center bore, andthe concentrically graduated portion further including a first intermediate bore between the center bore and the forward bore which is larger in diameter than the center bore and smaller in diameter than the forward bore; and

    a spring means for biasing the sleeve against the detent balls causing the shoulder to contact the balls to urge the detent balls forward against the interior walls of the radial bores generating responsive tangential forces through the detent balls against the radiused portion of the groove and further to urge the detent balls into the longitudinal bore and against the shank whereby the detent balls are positionally locked between the shoulder, the shank and the radial bores;

    whereby the shank of the tool bit is locked in position with substantially no end play between the detent balls and the inner end of the longitudinal bore.

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