Drill chuck
Patent 4991860 Issued on February 12, 1991. Estimated Expiration Date: 
March 13, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 13, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 322734 filed on 03/13/1989US Classes:279/62, Conical sleeve279/61, Threaded sleeve and jaw279/131, To grip tool or workpiece279/902KEYLESS TYPE SOCKETExaminersPrimary: Bilinsky, Z. R.Assistant: Schultz, Robert Attorney, Agent or FirmForeign Patent References
International ClassB23B 005/22Foreign Application Priority Data1988-03-11 DEAbstractClamp jaws are arranged symmetrically about a rotation axis in a chuck body and guided in a direction inclined to the rotation axis. A tightening ring is mounted rotatable and axially nonslidable on the chuck body and is provided with a tightening thread for moving the clamp jaws which is engaged with a row of teeth on each of the clamp jaws. An opening for connection of a drill spindle is located in the tightening ring. As seen in a direction running from the drill spindle to the clamp jaws, the tightening thread has a direction of rotation, by which the clamp jaws are moved toward the drill tool or tighten on the drill tool in clockwise rotation of the tightening ring on the chuck body. Thus the drill chuck has aftertightening and selftightening properties. | |
