Cutting and drilling apparatus with threadably attached compacts
AssigneeGeneral Electric Company
InventorDonald A. Thompson
Life of this patent
Estimating the term…
Abstract
An apparatus for rock cutting and drilling. A preferred embodiment of the apparatus is a drill bit comprised of composite compact cutters removably secured or attached to the drill crown. The cutter is preferably comprised of a stud or pin with an abrasive composite compact bonded at one end of the stud. The securing means for the cutter is comprised of a sleeve and a bushing fixed in the recess of the bit crown. The sleeve has a threaded outer wall for engagement with a threaded inner wall of the bushing. The height of the cutter is adjustable by the provision of metal shims between the bottom of the recess and the base of the stud of the cutter.
Claims10
In a drill bit comprising:
- (a) a support;
- (b) at least one recess formed in said support;
- (c) at least one cutting element including
- a stud and a mass of bonded abrasive particles bonded
- to said stud, a cutting element mounted in each recess;
- the improvement which comprises a securing means for each cutting element defined by:
- (d) threaded means associated with said recess and defining a threaded inner wall;
- (e) said stud having a frustoconical shape over at least part of its length and having its largest diameter toward the support;
- and
- (f) a sleeve having an inner wall and a threaded outer wall;
- such that the outer wall of the sleeve may be threadably engaged with the inner wall of the threaded means and the inner wall of the sleeve is disposed around and engages said stud, whereby said stud is secured in said recess.
A drill bit comprising:
- (a) a support;
- (b) at least one recess formed in said support;
- (c) a cutting element including a stud and a mass of bonded abrasive particles bonded to said stud;
- (d) means for threadably securing said stud in said recess, said securing means including a bushing fixed in said recess and having a threaded inner wall;
- a sleeve, said sleeve being disposed about said stud and having a threaded outer wall in threaded engagement with said bushing inner wall;
- and
- (e) locking means for preventing said sleeve from turning in said recess, said locking means comprising a pin inserted in a hole along the interface between said sleeve and said bushing.
Dependencies are inferred from the claim text.