Back to results
US 4,729,439 AGranted
Gang drill construction
AssigneeIngersoll-Rand Company
InventorEwald H. Kurt
Life of this patent
Estimating the term…
Abstract
Disclosed is a new method of construction for multiple or gang down hole rock drills. A rigid mounting cylinder with alignment and securing means for the individual drills is provided. The cylinder further serves to attach the multiple drills to a single drill string which supplies air to the individual drills. The cylinder further facilitates rock chip removal by filling all but the peripheral annulus which forms the exit channel for exhaust air.
Claims4
A gang drill for rock boring and the like comprising:
- an assembly of a plurality of individual percussion producing rock drills in a cylindrical drill casing having a top end connected to a drill string and a bottom end adjacent rock boring bits operatively associated with each of said drills;
- said casing totally enclosing said percussive producing rock drills, and being further provided with alignment means, securing means, and means for supplying pressure fluid for each of said drills of said plurality of drills, said pressure fluid entering said drills internal of said casing and exiting said drills external to said casing at its bottom end whereby said casing forms a peripheral passage for the exiting of rock cuttings and provides protection for said drills.
Dependencies are inferred from the claim text.