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Hand-held tool with detachable tool bit chuck

  • US 4,824,298 A
  • Filed: 10/22/1987
  • Issued: 04/25/1989
  • Est. Priority Date: 10/23/1986
  • Status: Expired due to Fees
First Claim
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1. Hand-held tool for use as a power drill, a hammer drill, a powered screwdriver and the like, comprising a housing having a front end and a rear end, a rotary spindle located within said housing and having a front end and a rear end and an axis of rotation extending in the front end--rear end direction with said front end of said spindle projecting from the front end of said housing, a chuck arranged to hold a drill bit detachably on an axially extending front end part of said spindle and projecting in the axis of rotation direction of said spindle from the front end thereof, said chuck includes a chuck part fitted on the front end part of said spindle and having an axially extending chuck section connected to the front end part of said spindle, said chuck section being rotatably lockable with said spindle wherein the improvement comprises that said chuck section and front end part have corresponding axially extending conically-shaped surfaces engageable with one another, said conically-shaped surfaces comprise a conically-shaped shaft section on one of said spindle and said shaft section and means forming a conically-shaped bore on the other one, said spindle having an outer surface and comprises a recess formed as a circumferentially extending annular groove extending in the axis of rotation direction on said outer surface and said recess having an opening in the outer surface and a base inwardly of said opening with said base being shorter in the axis of rotation direction of said spindle than the opening, said recess having a flank closer to the front end of said spindle inclined from the opening of said recess to the base thereof in the direction towards the rear end of said spindle, a clamping member supported in a radially extending through opening of said chuck section and said clamping member extends into said recess in said spindle in abutment with said flank, a spring member in engagement with said clamping member for displacing said clamping member into engagement with said recess in said spindle, means in contact with said spring member for displacing said clamping member into and out of engagement with said recess, and the dimension of said clamping member within said recess in the axis of rotation direction corresponding at most to the least dimension in the axis of rotation direction of the opening in said recess.

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