Improvements in Rock-drilling Machines.
Year: 1887

page_text: Improvements in Rock-drilling Machines.
We, RIVERIOUS PALMER ELMORE of 159 West Twenty third Street, New York,
County and State of New York, Inventor and GEORGE GRIDLEY TILLOTSON of
Stroudsburg, Monroe County, State of Pennsylvania, Manufacturer, both of the
United States of America do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
Our invention relates to that class of hand power rock drilling machines in which
the work is accomplished by means of a spring acting hammer, striking on the end
of a drill rod or holder when the drill is caused to bear against the rock, said drill, .
after each impact of the hammer, being withdrawn from the rock, partly rotated, and
set back ready for the succeeding blow; and in which the operating parts of the
machine are carried by a slide which is automatically fed forward as the cutting of the
rock takes place.
In the accompanying drawings to which we will now refer :
Fig. 1 is an elevation of our improved rock drilling machine;
Fig. 2 is a plan view of the same;
Fig. 3 is a rear view of the same;
Fig. 4 is a transverse section cut in the line x, x, fig. 1 ;
Fig. is a plan of the feeding mechanism, cut on the line y, y, fig. 3;
'
Fig. 6 is a longitudinal sectional view of the drill holder and part of the carriage.
Fig. 7 is a detached elevation of the hammer shaft and actuating levers; and
Fig. 9 is a plan view of the same.
The main frame a, is an open rectangular casting having longitudinal guide
bearings a, a, in which the carriage b, is fitted to slide and bearings at its ends in
which the feed screw c, is held so as to rotate freely therein and have no end play.
Through an opening in the front end of the lower part of the frame
a is placed the
steadying bar d, locked to the frame by the pin d', and provided with a screw point
adapted to be pressed firmly against the rock when the machine is set up for action.
The bottom of the frame a, is slotted for the reception of the bolt e, which passes
through the standard e¹, shaped at its upper end to embrace the guide a³, at the

page_text: bottom of the frame; and, through the angle plate e², a nut on the lower end of
the bolt clamps the frame rigidly on the angle plate. Through the other side of the
angle plate e, passes the threaded end of the eye bolt e³, which embraces the column
or bar e, a half cylindrical bearing block or washer e, being located between the
bar e, and the angle plate. The column or bar et, is of the ordinary construction
and adapted to be wedged or screwed in a drift or tunnel either in a horizontal or
vertical position; the universal clamp e, e¹, e², e³, e³, is, as will be seen, of such
construction as to permit the frame to set in any position at any angle on the
column e*.
The carriage b, which carries all the operating parts of the machine, is made in one
piece, having all the bearings &c., for the mechanism formed integral therewith.
In its upper part is formed the cylindrical cavity in which is fitted to rotate and
slide the hollow drill holder f, which is provided at one end with the chuck 1,
composed of hinged jaws and a screw sleeve for forcing the jaws on to the drill Y and
at the other end with a large head or collar, which is held against the end of the
carriage by the coil spring f³, surrounding the hollow drill holder f. The hole
through the holder f, is large enough to allow the cutting edge of the drill
to pass
through it, so that the drill may be withdrawn from the rock and removed from the
machine without disturbing the adjustment of the machine, and as the blow receiving
end of the drill is smaller than its cutting end, the sleeve h, is fitted in the end of the
hollow holder f, to hold the drill centrally therein. On this sleeve h, are placed the
elastic washers', located between its head and the collar 2, of the drill holder, to
counteract or deaden the effects of blows of the hammer when the machine is not
provided with a drill. This sleeve h, is provided with a bayonet slot adapted to catch
over a pin in the hollow holder as shown at fig. 6 to permit of its ready removal and
replacement when the drill is being changed.
The hammer i, is pivoted at the lower end of its handle to the bracket piece bl
integral with the carriage b. It is actuated by toggle links 2, 1³, sliding
on the
stud, each of which is connected at one of its ends to the forked lever i¹, pivoted to
the frame b, and at its other end works against the latch s, pivoted in the hammer
shaft. As this lever is moved up and down, the links 2, 3, slide past each other, in
opposite directions, on the stod, and also rock thereon. The outer ends of the
links 2, 3, which work against the latch are partly square and partly beveled. The
latch s, when moved to the right, as clearly shown in figs. 7 and 8, engages with
the link 3, so that the outward movement of the end of the link pushes the hammer
back. The rocking movement of the link brings its inclined portion in contact with
the latch at the end of the stroke, causing the latch to be pushed clear of the link, and
allowing the spring to actuate the hammer and cause it to strike a blow on the end of
the drill rod. The latch s is now in position to engage with the link 2, and is carried
back thereby until released at the end of the stroke and thrown in position to engage
with the link. Thus the operation continues, two blows being struck for each
oscillation of the forked lever . The pin s working in a slot in the latch s, limits
its movement.
The link connects the forked lever to the pivoted handle j¹. This handle is
made with a double curve, and is jointed at 2, the two parts being provided with
locking teeth and held together by a bolt passing through them. These locking teeth
are formed on both sides of the detachable part of the handle, so that either side of it
may be attached to the other part. This construction allows the handle to be set in
any position most convenient for actuating it.
The link has at one end a slotted connection with the bolt, which connects the
link to one branch of the forked lever, and is at its other end pivoted to the centre
joint of the toggle links, . When the lever has moved through part of its
stroke, this pin reaches the end of the slot in the link, and the link then moves
with the lever . And as the toggle link has a fixed pivot at its outer end, while
the outer end of the toggle lever slides on the bolt this movement of the link
causes the outer end of the toggle to come in contact with the head and thus
moves the drill back from the bottom of the hole. When, however, the centre joint

page_text: passes beyond the centre end of the toggles, the slot in the link permits the
spring to act and throw the drill forward in place, thus completing this movement
of the drill before the hammer is released to strike the blow.
The rear end of the hammer actuating spring k, is held by the inverted caich 1,
set in a vertical hole formed in the extreme rear end of the carriage b. This hole is
rectangular at its upper end, and the vertical part of the piece has a rectangular
shoulder just below its horizontal part, but is cylindrical throughout the remainder of
its length, so that, when it is raised up to the limit of its motion, determined by the
collar or washer, it is free to be rotated thus allowing of the ready insertion or
removal of the spring between or from it and the hammer shaft, the bent ends of the
spring fitting into recesses formed in the hammer shaft and the piece 1, as shown in
figs. 1 and 2, the square part of the hole in the carriage then holding the piece /
securely in this position. When the spring k is removed, the piece 1, by being set
back in the position shown by the full lines in figs. 2, acts as a stop for the hammer i ;
and when turned around as shown by the dotted lines, the hammer i, is free to fall
down, as shown by the dotted lines, fig. 1, allowing a free passage for the removal
of the drill from the rear of the machine, as before described.
To impart an intermittent motion to the drill, the drill holder, is provided with a
ratchet wheel m, having peripheral and side teeth; and on the top of the carriage b,
is pivoted in an angular position, the spring pawl or dog m³, the end of which catches
into the side teeth of the wheel m; so that, as the drill holder is moved back, it is
caused, by said pawl m³, to be partly rotated. A retention spring catch m², secured
to the carriage b, holds the drill holder as it is rotated, by engaging with the peripheral
teeth of the wheel m.
The carriage is locked in any desired position relatively to the main frame a, by
the half nut n, fitted to slide vertically without rotation in guides (n the carriage b,
and operated to engage the feed screw c, by means of the lever han lle n', located at
the front side of the machine, so as to be easily accessible to the operator. The
handle n is provided with a crank pin which engages in a slot formed in the side of
the half nut n.
b
When the nut n, is set away from the screw c, the carriage & may be slid freely in
the frame a, and when it is locked in contact with the screw, the carriage is automati-
cally moved forward by the rotation of the screw c in the half nut n, the screw
actuating device consisting of the spring pawl o, carried by the transverse slide o³,
which acts on the teeth of the ratchet wheel p, fitted to rotate in a bearing on the
carriage b without end play, and provided with a key or spline p' fitting into a slot c¹
formed longitudinally in the screw c. The transverse slide o, is actuated by the
longitudinal slide, through the medium of the bell crank lever q¹. And this slide
is caused to move with the drill holder, by its upturned or forked end 72, engaging
in a circumferential grooves, formed in the drill holder f. A retention spring r
holds the ratchet wheel p in position for the pawl o to take hold of its teeth
successively. The pawl o, after acting on a tooth of the ratchet wheel p, and thereby
rotating the screw c and moving the carriage forward a short distance, does not
engage with the succeeding tooth until the drill carried by the drill holder, has cut
away the rock sufficiently to allow the holder to move forward to such an extent as to
permit the pawl o to face over the edge of the succeeding tooth; the number of cutting
actions of the drill to accomplish this work being determined by the resistance of the
rock acted upon.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is
1-
First In a rock drilling machine, in combination, an oscillating hammer, a catch
or spring holder so fitted in the frame as to occupy two positions, in one locked behind
the haminer, and in the other out of the path of the same, and a spring held between
the catch and the hammer when the catch is in its locked position, substantially as set
forth.

page_text: Second: In a rock drilling machine having a longitudinally moving drill holder
and a feeding screw parallel therewith, the combination with the drill holder and
feeding screw, of a slide actuated by the drill holder, a ratchet wheel surrounding and
provided with means for imparting rotary motion to the screw, a transverse slide
and feed pawl arranged to act on the ratchet wheel, and a connection between the
longitudinal and transverse slides, whereby they are caused to move in unison,
substantially as and for the purpose set forth.
Third: In combination, the hammer i, the spring, the L catch 1, and the rear end
of the carriage, provided with a square socket hole, substantially as and for the
purpose set forth.
Fourth The double handle formed of two pieces, in combination with locking
teeth formed on their adjacent connecting faces, one of the pieces having said locking
teeth on both of its sides, and connecting bolts, substantially as and for the purpose
set forth.
:
Fifth In combination, the hollow drill holder, the chuck ¹, secured to its front
end, the collar 2, at its rear end, and the guide sleeve h, provided with the elastic
washers ', detachably fitted in its rear end, substantially as and for the purpose set
forth.
Sixth: The combination with the main frame a, and screw c, of the carriage b,
sliding half nut n, fitted in guides at the rear side of the carriage, and the handle n',
located on the front of the carriage and provided with a crank pin acting in a slot in
the nut, substantially as and for the purpose set forth.
Seventh In combination the drill holder f, the slide q, the bell crank q', the slide o¹
the pawl o, the ratchet wheel p, and the screw c, substantially as and for the purpose
set forth.
Eighth The combination with the main frame a, and grooved screw c, of the
carriage b, the ratchet wheel p, having a spline p¹, the pawl o, the slide o¹, the bell-
crank lever, the forked slide 9, and the circumferentially grooved drill holder,
substantially as and for the purpose set forth.
:
Ninth In combination, the spring k, the catch, the hammer i, pivoted to an
arm of the frame, the latch s, pivoted in the hammer shaft, the links 2, 3, sliding on
the bolt, the forked lever joined to each of the levers 2, 3, the connecting link 26,
and the handle j, substantially as and for the purpose set forth.
Tenth In combination the hollow or drill holder f, the washer f¹, the toggle
links, the slotted link 7, the bolt, the forked lever, the links, ³, actuating
the hammer, the connecting link, and the handle j, substantially as set forth.
Data: anal
1007
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicants.