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Title: Drill drive mechanism

Abstract

A drill drive mechanism is especially adapted to provide both rotational drive and axial feed for a drill of substantial diameter such as may be used for drilling holes for roof bolts in mine shafts. The drill shaft is made with a helical pattern of scroll-like projections on its surface for removal of cuttings. The drill drive mechanism includes a plurality of sprockets carrying two chains of drive links which are arranged to interlock around the drill shaft with each drive link having depressions which mate with the scroll-like projections. As the chain links move upwardly or downwardly the surfaces of the depressions in the links mate with the scroll projections to move the shaft axially. Tangs on the drive links mate with notch surfaces between scroll projections to provide a means for rotating the shaft. Projections on the drive links mate together at the center to hold the drive links tightly around the drill shaft. The entire chain drive mechanism is rotated around the drill shaft axis by means of a hydraulic motor and gear drive to cause rotation of the drill shaft. This gear drive also connects with a differential gearset which is interconnected with a second gear.more » A second motor is connected to the spider shaft of the differential gearset to produce differential movement (speeds) at the output gears of the differential gearset. This differential in speed is utilized to drive said second gear at a speed different from the speed of said gear drive, this speed differential being utilized to drive said sprockets for axial movement of said drill shaft.« less

Inventors:
 [1]
  1. Englewood, CO
Issue Date:
OSTI Identifier:
863441
Patent Number(s):
4172391
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
F - MECHANICAL ENGINEERING F16 - ENGINEERING ELEMENTS AND UNITS F16G - BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES
DOE Contract Number:  
ET-74-C-01-9088
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
drill; drive; mechanism; especially; adapted; provide; rotational; axial; feed; substantial; diameter; drilling; holes; roof; bolts; mine; shafts; shaft; helical; pattern; scroll-like; projections; surface; removal; cuttings; plurality; sprockets; carrying; chains; links; arranged; interlock; link; depressions; mate; chain; move; upwardly; downwardly; surfaces; scroll; axially; tangs; notch; means; rotating; center; hold; tightly; entire; rotated; axis; hydraulic; motor; gear; rotation; connects; differential; gearset; interconnected; connected; spider; produce; movement; speeds; output; gears; speed; utilized; especially adapted; drive mechanism; axial movement; roof bolt; output gear; shaft axis; roof bolts; rotational drive; drilling holes; drill drive; mine shaft; chain drive; /173/175/226/474/475/

Citation Formats

Dressel, Michael O. Drill drive mechanism. United States: N. p., 1979. Web.
Dressel, Michael O. Drill drive mechanism. United States.
Dressel, Michael O. Mon . "Drill drive mechanism". United States. https://www.osti.gov/servlets/purl/863441.
@article{osti_863441,
title = {Drill drive mechanism},
author = {Dressel, Michael O},
abstractNote = {A drill drive mechanism is especially adapted to provide both rotational drive and axial feed for a drill of substantial diameter such as may be used for drilling holes for roof bolts in mine shafts. The drill shaft is made with a helical pattern of scroll-like projections on its surface for removal of cuttings. The drill drive mechanism includes a plurality of sprockets carrying two chains of drive links which are arranged to interlock around the drill shaft with each drive link having depressions which mate with the scroll-like projections. As the chain links move upwardly or downwardly the surfaces of the depressions in the links mate with the scroll projections to move the shaft axially. Tangs on the drive links mate with notch surfaces between scroll projections to provide a means for rotating the shaft. Projections on the drive links mate together at the center to hold the drive links tightly around the drill shaft. The entire chain drive mechanism is rotated around the drill shaft axis by means of a hydraulic motor and gear drive to cause rotation of the drill shaft. This gear drive also connects with a differential gearset which is interconnected with a second gear. A second motor is connected to the spider shaft of the differential gearset to produce differential movement (speeds) at the output gears of the differential gearset. This differential in speed is utilized to drive said second gear at a speed different from the speed of said gear drive, this speed differential being utilized to drive said sprockets for axial movement of said drill shaft.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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