Patent ID: 7698794
Filing Date: 2010-04-20
Classification: B21J,Y10T

Abstract:
1. A pulling head configured for use with a pull type tool, said pulling head comprising: a telescopic housing configured to engage the pull type tool; a compressible element on the housing and configured to limit the ultimate load which is applied by the pull type tool during operation, wherein the telescopic housing comprises a first housing component and a second housing component, wherein said first and second housing components are configured to telescope relative to each other, wherein the first housing component comprises a threaded component which is configured to threadably engage a housing of the poll type tool; a pin which is engaged with the second housing component, wherein the first housing component includes two slots, wherein the pin extends through the slots in the first housing; and a drawbolt assembly which is disposed in the telescopic housing, wherein said drawbolt assembly comprises a drawbolt and collet, wherein the drawbolt has a front end and a heck end, and is generally cylindrical with a bore provided at its front end and a threaded bore provided at its rear end, wherein the threaded bore provides that the drawbolt is threadable onto a piston of the pull type tool, wherein an externally threaded portion is provided proximate the front end of the drawbolt for threading into a rear end of the collet, wherein the collet is generally cylindrical having an opening in its front end, wherein the drawbolt includes a pair of slots which receive the pin, wherein the drawbolt assembly further comprises a compression spring, a jaw follower, and a set of jaws which are configured to grip a mandrel during operation of the pulling head, wherein a rear end of the compression spring sits in a recess which is provided proximate the front end of the drawbolt, and a front end of the compression spring engages a shoulder of the jaw follower, wherein a rear end of the jaw follower extends into the bore which is provided in the front end of the drawbolt, and a front, facing surface of the jaw follower contacts a back surface of the jaws.