Drill string holder

Details Drill string holder Drill string holder

1976-12-09

1978-06-27

Dorner, Kenneth J.

Buckles, buttons, clasps, etc.

Bale and package ties, hose clamps

With tighteners

81 5733, 166 775, 175220, 269 32, A44B 2100, E21C 1100

Patent

active

040966089

ABSTRACT:
A drill string holder for a rock drilling machine has two jaws opposite each other for gripping a drill string, e.g. the drill string in core drilling with a diamond drill bit. The jaws are forced into their gripping positions by means of a heavy spring. A first selectively actuatable hydraulic piston is arranged to overcome the spring and permit the jaws to release their grip. A selectively actuatable second piston is located inside the first piston. By means of the second piston, the operator can apply a selectively variable force to the jaws when the jaws are released from the spring. This permits the operator to let the drill string gently down into the bore hole by applying a controlled braking force on it.

REFERENCES:
patent: 2351887 (1944-06-01), Steadman
patent: 2586784 (1952-02-01), Capp et al.
patent: 2858893 (1958-11-01), Waggener
patent: 2985455 (1961-05-01), Powell
patent: 3692320 (1972-09-01), Lindelof et al.
patent: 3696872 (1972-10-01), Jonsson

Affiliated with

Also associated with

Rating

Drill string holder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drill string holder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drill string holder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2297935