Drill chuck for smooth- and hex-shank bits
AssigneeRohm Co., Ltd.
InventorsGunter Horst Rohm, Hans-Dieter Mack
Life of this patent
Estimating the term…
Abstract
A drill chuck has a chuck body centered on an axis and forming an axially forwardly open bit-receiving recess, an axially forwardly open polygonal-section seat at a base of the recess, and a plurality of jaws spaced angularly around the seat. The jaws can be displaced radially inward and outward to grip a bit in the recess. An element can move in the base of the recess between a blocking position in front of the polygonal-section seat and preventing entry of a bit thereinto and a freeing position clear of the seat and permitting entry of a bit thereinto. This element can be actuated for movement between the blocking and freeing positions either manually or automatically.
Claims20
A drill chuck comprising:
- a chuck body centered on an axis and forming an axially forwardly open bit-receiving recess;
- means forming at a base of the recess an axially forwardly open polygonal-section seat;
- a plurality of jaws spaced angularly around the recess forward of the seat;
- tightening means for displacing the jaws radially inward and outward, whereby the jaws can grip a bit in the recess;
- an element displaceable in the base of the recess between a blocking position in front of the polygonal-section seat and preventing entry of a bit thereinto and a freeing position clear of the seat and permitting entry of a bit thereinto;
- and
- actuating means on the chuck body for displacing the element between the blocking and freeing positions.
The drill chuck defined in claim 18 wherein a one of the jaws is formed with a cam surface engageable with the element to displace it between the blocking and freeing positions, the predetermined position corresponding to the blocking position of the element.
Dependencies are inferred from the claim text.