Drill drive mechanism

Patent · Mon Jan 01 04:00:00 EST 1979

OSTI ID:863441

Dressel, Michael O ^[1]

---

1. Englewood, CO

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.

• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4172391
• OSTI ID: 863441
• Country of Publication: United States
• Language: English

Related Subjects

/173/175/226/474/475/
adapted
arranged
axial
axial movement
axially
axis
bolts
carrying
center
chain
chain drive
chains
connected
connects
cuttings
depressions
diameter
differential
downwardly
drill
drill drive
drilling
drilling holes
drive
drive mechanism
entire
especially
especially adapted
feed
gear
gears
gearset
helical
hold
holes
hydraulic
interconnected
interlock
link
links
mate
means
mechanism
mine
mine shaft
motor
move
movement
notch
output
output gear
pattern
plurality
produce
projections
provide
removal
roof
roof bolt
roof bolts
rotated
rotating
rotation
rotational
rotational drive
scroll
scroll-like
shaft
shaft axis
shafts
speed
speeds
spider
sprockets
substantial
surface
surfaces
tangs
tightly
upwardly
utilized