The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1979
Filed:
Oct. 06, 1977
Milton L Benjamin, Moreland Hills, OH (US);
Wilbur N Miles, Chagrin Falls, OH (US);
Erickson Tool Company, Cleveland, OH (US);
Abstract
A chuck is disclosed wherein the jaws of the chuck may be locked by tapered lock means so that if actuating force on the chucking and unchucking actuator is lost during rotation of the chuck, the external diameter of the workpiece will still be gripped by the jaws. A first linkage in the chuck body interconnects an axially movable actuator with the radially movable master jaws. This may be a bell crank lever or an interconnecting wedge. First lost motion means is provided in this first linkage. A second linkage is provided from the actuator to the tapered lock means and includes a second lost motion means which is smaller than the first lost motion means. A spring urges the tapered lock means into a locked position when the workpiece is chucked and then if force is lost on the actuator, this tapered lock means acting on the master jaws prevents release of the workpiece. When the actuator is moved toward the unchucking position, it acts first through the second lost motion connection to release the tapered lock means and then acts through the first lost motion connection to move the jaws outwardly to release the workpiece.