Air-operated self-propelling rotary-percussive downhole drill

Patent 4209070 Issued on June 24, 1980. Estimated Expiration Date:

January 10, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

913928

1654833

2887989

Air-operated drilling machine or rotary-percussive action Patent #: 3978931
Issued on: 09/07/1976
Inventor: Sudnishnikov , et al.

Inventors

Application

No. 05/868464 filed on 01/10/1978

US Classes:

173/78, Cleansing fluid passage through hammer head173/110, Rotation is intermittent or oscillatory173/131, Formed of plural transmitting part or separate layers173/80, Cleansing fluid passage in impact transmitting anvil175/99Fluid-operated

Examiners

Primary: Pate, III, William F.

Attorney, Agent or Firm

Haseltine, Lake & Waters

International Classes

E21B 4/14 (20060101)
E21B 4/00 (20060101)
E21B 4/18 (20060101)
E21B 4/16 (20060101)

Abstract

The drill has a housing receiving therein a reciprocating striker, effecting percussive action upon the tool for breaking the rock at the face of the hole, mounted at the forward part of the housing, and upon the housing itself for propelling the drill in the hole. The housing also receives therein a mechanism for rotating the tool, including a self-controlled coupling provided with a movable sleeve and a stationary sleeve and adapted to transmit a torque to the tool in only one direction of rotation. The drill is provided with a device preventing a rearward motion of the housing and its rotation during a drilling operation. The drill is characterized by having a return device for retracting the tool from the face after it has been struck by the striker. The return device includes a piston mounted on the tail portion of the tool and mounted intermediate the striker and the forward bottom of the housing, a piston space defined between the piston and the forward bottom of the housing and a resilient member accommodated in this space and cooperating with the piston.