公开(公告)号：US3630295A

公开(公告)日：1971-12-28

申请号：US3630295D

申请日：1969-12-10

Applicant: BELL TELEPHONE LABOR INC

Inventor： COYNE JAMES C ,  MCCOY ROBERT G

IPC: E21B7/06 ,  E21B7/08 ,  E21B7/26 ,  E21B7/04

CPC classification number: E21B7/068 ,  E21B7/26

Abstract: This application discloses a steering scheme for an earthburrowing device. The scheme involves an articulatable tail with an active fin or fins. The fin stabilizes the device in steering situations where control would otherwise be lost, by permitting simultaneous steering and roll actions. In one embodiment, the fin protrudes a fixed distance into the soil stream but is pivoted perpendicular to the tail sleeve so that its angle of attack provides variable direction and speed of roll. In another, two retractable fins are used to impart respectively clockwise and counterclockwise rotation.

公开(公告)号：US2494051A

公开(公告)日：1950-01-10

申请号：US63204945

申请日：1945-11-30

Applicant: BELL TELEPHONE LABOR INC

Inventor： MCCOY ROBERT G ,  WERRING WALTER W

IPC: H01C17/04

CPC classification number: H01C17/04 ,  Y10T29/49082 ,  Y10T29/49096

公开(公告)号：US2393548A

公开(公告)日：1946-01-22

申请号：US55225444

申请日：1944-09-01

Applicant: BELL TELEPHONE LABOR INC

Inventor： MCCOY ROBERT G

IPC: H01F41/06

CPC classification number: H01F41/094 ,  H01F41/071 ,  H01F41/082