Patent ID: 7021874
Filing Date: 2006-04-04
Classification: B23D,Y10T

Abstract:
1. An internal broaching machine comprising: a broach having a front shank or pull end and a rear shank or follower end, said pull end being formed with a tapered surface and having engagement grooves formed on opposite sides of the pull end; a pull head and a retrieving head for respectively gripping said pull end and said follower end, said pull head being formed with a tapered inner surface complementary to said tapered surface of said the pull end; means for connecting the broach between the pull and retrieving heads with the tapered surface of the broach pressed against the tapered inner surface of at least one head and firmly connecting the broach with the pull and retrieving heads; and a pull mechanism for pulling the broach toward the pull head, said pull mechanism comprising a pair of radially oriented holes oppositely formed in the pull head, claw members slidably received in the holes respectively, and a sleeve slidably mounted on the pull head and having inward projecting portions for engaging and pushing the claw members, so that when the sleeve is moved, the projecting portion of the sleeve thrusts the claw members against the tapered surfaces of the pull end engagement grooves to pull the broach toward the pull head.