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Self-retaining sleeve and bit

  • US 4,084,856 A
  • Filed: 09/07/1976
  • Issued: 04/18/1978
  • Est. Priority Date: 02/09/1976
  • Status: Expired due to Term
First Claim
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1. A support member for supporting a tool having:

  • (a) a tool bit with a pointed forward portion and a solid cylindrical rearward shank portion with said portions being co-axial, said support member including a hollow tubular sleeve having an inside diameter adapted closely but freely rotatably to receive the rearward shank portion of the tool bit and having an outside diameter adapted rotatably to be received in a bore in a support block,(b) said hollow tubular sleeve having at least two circumferentially spaced apart slots extending generally axially therein from the rear end to form at least two finger portions each integral with said sleeve and each being resilient and generally yieldable radially inward adjacent the rear end of the sleeve,(c) an integral radial projection on the outside of each finger and adjacent the rear end of the sleeve and constructed and arranged for engagement with the support block at the rear end of the bore in the support block to releasably retain the sleeve in assembled relation therewith while permitting the sleeve to rotate freely in the support block,(d) said sleeve having a rearwardly facing element of abutment means for engagement with the support block and a forwardly facing element of abutment means for engagement with the tool bit, and(e) means forming a groove in said bore of said sleeve and means forming a groove on the outside of said tool bit rearward shank portion, said grooves being in axial registry when said rearward shank portion of said tool bit is received in said bore of said sleeve with said abutment means engaging each other, said groove in said sleeve being a relatively deep groove in comparison to the groove in said tool bit rearward shank portion, and a resilient ring retained in said sleeve groove having an inner diameter slightly smaller than said tool bit rearward shank portion so as to engage in said groove of said tool bit rearward shank portion to releasably retain said tool bit in assembled relation with said sleeve while permitting relative free rotation of said tool bit and said sleeve.

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