Improvements in Rook Drilling Machines.
Year: 1896

page_text: Date of Application, 1st Sept., 1896-Accepted, 21st Nov., 1898
COMPLETE SPECIFICATION.
Improvements in Rook Drilling Machines.
A communication by RIVERIONS PALMER ELMORE, of 25 Quincy Street,
Chicago, in the County of Cook and State of Illinois, United States of
America, Manufacturer.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6 Bank Street,
Manchester, both in the County of Lancaster, 118 New Street, Birmingham in
the County of Warwick and 322 High Holborn in the County of Middlesex,
Civil Engineer, 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 :-
Figure 1 is a side elevation of the drilling machine complete as it would appear
ready for operation.
Figure 2 is a side view of an extensible supporting bar for supporting the.
machine while in operation, a portion being broken away to show its interior
parts.
Figure 3 a detailed side view of the drill rotating ratchet mechanism of the
machine.
Figure 4 is a vertical cross section of the machine taken on line 1 of Figure 1
looking in the direction of the arrow, also an end view of the carriage of the
machine with the parts for operating and striking the drill-holder removed.
Figure 5 is a detail view, showing a plan of the pawl for turning the ratchet
wheel on the feed screw.
Figure 6 is a perspective view of the upper gib for holding the two frames
together, and for supporting the pawl of the ratchet wheel on the feed screw.
Figure 7 is a detail view, showing a side view of the spring bolt for engaging
the hammer handle to give the hammer stroke, and of a part of the frame for
carrying said bolt, a coil spring sleeved thereou, and a longitudinal section of an
adjusting nut fitting the tubular end of said frame for adjusting the tension of said
spring.
Figure 8 is a longitudinal section of the reciprocating drill holder, and a sido
view of the drill chuck attached to its forward end.
.
Figure 9 a detailed perspective of the half nut and bolder thereof, of the
machine carriage, for engaging the feeding screw of the machine frame.
Figure 10 a detailed perspective of a portion of said screw.
Figure 11 a similar view of a covering plate for said half out.
Figure 12 a detailed sectional view of said half nut and covering plate, and of
a portion of the machine carriage, and a side view of the device for adjusting said
half nut, and
Figure 13 a detailed view of the striking hammer and handle thereof, of the
machine, to more fully show the swinging latch piece of said handle.
This invention relates to certain improvements in hand power rock drilling
machines of the class wherein the work is accomplished by means of a spring
hammer striking at the end of the drill holder, when the drill is caused to bear
against the rock, said drill after each impact of the hammer being withdrawn from
the rock, partially rotated, and set back against the rock ready for the next :
succeeding blow, and in which the operating parts of the machine are carried by a.

page_text: sliding frame or casting which is automatically fed forward as the drilling of the
rock progresses, and this invention is intended to be for certain improvements in
the rock drilling machine; said improvements comprising a new ratchet device for
rotating the ratchet wheel on the feed screw shaft, a new spring latch locking
device for preventing rotation of the drill holder when the drill is being placed in
or removed from its chuck, a new device for adjusting the tension of the hammer
spring, a new spring catch for preventing backward rotation of the ratchet wheel
on the feed screw shaft, a new spring latch for preventing backward rotation of the
drill holder and its chuck, a hand wheel on the end of the feed screw shaft for
turning said screw ebaft to adjust the sliding frame, and in other improvements
which are fully set forth and explained in the following specifications and
claims.
Referring to the drawings, A represents the main frame, consisting of an open
rectangular casting having guide bearings in which the carriage B is fitted to slide,
and held together by means of gibs n and n secured to said frame B and having
bearings at its ends in which a feed screw V is held so as to rotate freely, but
have no end movement. The main frame A rests on a pedestal E which stands on
a brucket D having a horizontal eye at its side through which passes a tubular
bar Xin which is fitted the rod X having end adjustment in said tubular rod, and
held adjusted by means of a pin passing through the pin holes d as shown in
Figure 2. The outer end of said tubular rod is provided with a foot base g having
its face provided with teeth as shown at h for bearing against the side of a drift or
tunnel, and the rod z is bored out in its forward end for receiving a screw bolt
adapted to be screwed out against the side wall of the drift or tunnel, thus forming
a solid rest for the machine. The upper part of the sliding frame B is provided
with a longitudinal bore for receiving the drill holder S', as shown more particularly
in Figure 8.
A chuck F is secured on the forward end of the drill holder and a flanged nut L
is turned on its rear extending end beyond the frame B.
J' is a heavy screw bolt fitting a bore in the outer end of the drill holder and
forms a head for the hammer U to strike against.
J' is a coil spring sleeved on the drill holder S' between the inner end of the
chuck F and an annular offset of frame B, which spring is for the purpose of
holding the drill forward, and operates to give the drill its stroke when the
drill holder is released after having been moved rearward by the operating
devices.
The drill holder chuck is provided with a ratchet wheel I having peripheral
teeth as shown in Figure 1, which is intermittently rotated by means of a double
pawl arm S-H', shown in Figures 1 and 3, the arm S' extending down to and
connecting with the operating lever R, from which lever it receives movement and
operates the ratchet wheel I by pushing against the teeth thereof, at its pawl end,
at each up operation of lever R, the pawl H' being hooked, arranged at the
opposite face of wheel I and pivotally connected with arm S' and provided with a
spring barrel, beyond its point of pivot, into which is placed a coil spring H
which impinges arm S' and thereby yieldingly holds both said pawls in contact
with wheel I, and being thus connected, each down movement of lever R causes
the hook of pawl H' to engage a tooth and continue the operation of wheel I.
Thus, while the pawl end of arm S is moving up operating wheel I, pawl H' is
likewise moved up and slips and over-reaches a tooth so as to be in readiness for
its down movement to operate wheel I. And likewise each down movement of
pawl H' will bring the pawl end of arm S' down and cause it to slip and under-
reach a tooth so as to be in readiness for its up movement to operate wheel I.
Thus, through the agency of said pawl arms lover R intermittently rotates
ratchet wheel I and with it the drill-chuck F and drill G' held thereby. And
As a means of preventing said pawl arms from moving sidewise off wheel I, they
are provided with lips which extend at the sides of the wheel I as shown in
Figure 3.

page_text: When it is desired to take out or replace the drill G, it is necessary to have the
drill holder S held from rotation in either direction while tho nut of the chuck is
being turned. In order to so hold the drill holder S a spring bolt or latch i is
fitted in the top of frame B as shown in Figures 1 and 8 for dropping into a
longitudinal groove p' in the drill holder. The barrel of said latch is fitted
with an adjusting nut h¹ having a groove pl across its upper end for receiving the
radial arms of the latch bolt i when it is desired to let said bolt or latch down
into the groove p of said drill holder for the purpose stated.
It is necessary that the drill holder S should bo fed forward at or after each
stroke. For this purpose the screw shaft V carries upon it a ratchet wheel!
shown in Figures 4 and 5. This ratchet wheel is splined upon said screw shaft in
such mauner that it may move along in either direction, and at the same time
rotate said screw intermittently in order to move the carriage B and its working
parts toward the work, or in other words, to feed the drill forward to its work.
Said ratchet wheel extends laterally into a recess in said carriage so as to travel
with it, and on said screw rod. This ratchet wheel is rotated intermittently by
means of a bell crank pawl K shown in Figures 1, 4 and 5.
This bell crank is pivotally connected at Q to the lower end of pin P which
passes up through the barrel on the end of gib n as shown in Figure 4. The lower
end of said pin has a head, and a coil spring m ou said pin in said barrel causes
said pin, through the medium of its head, to yieldingly hold said boll crank up
against said barrel so wear will not prevent ita proper action on its said ratchet
wheel. The outer end of one of the arins of said bell crauk ratchet pawl is
provided with a pair of upturned lugs o for carrying between them the flange of
the nut L attached to the outer end of the drill holder S as shown in Figures 1
and 4, while the outer end of the other arm of said pawl is arranged to engage the
peripheral teath of said ratchet wheel as shown particularly in Figure 5.
At each reciprocation of the drill holder St the said ratchet wheel will, through
the medium of said bell crank pawl, be rotated partially, and with it, said screw
rod V which by means of its connection with a half nut Y, shown in Figures 4
and 9, will causo the drill and its carriage to be fed forward to their work. This
bell crank K is one of the new features in this machine. In order to prevent
backward rotation of said ratchet wheel a spring bolt or latch K shown in
Figures and 5 is used to engage the teeth of said ratchet wheel. This spring
bolt used in connection with said ratchet and bell crank pawl is another new
feature in this machine. The screw V is shown in Figure 1 as having a hand
wheel T attached to one end. This hand wheel T is intended to be used for
turning said acrew shaft to adjust the sliding frame on carriage B forward until the
drill engages the rock so as to prevent the nut L on the rear end of the drill holder
from engaging the carriage frame B.
It is necessary when adjusting the carriage B to move it backward to enable the
drill to drill a new hole, to disengage the half out Y, shown in Figure 3 from the
screw V. This is done by means of turning the short shaft by means of crank J
attached to its outer end, ehown in Figures 1, 4 and 12. Said shaft has a crank
pin a on its inner end which enters a horizontal recess in the side of said half
nut Y and when said shaft r is turned, it will move said half nut vertically on
guides y' in such manner that the said half nut may engage or disengage said screw
as may be desired, so the carriage B may move freely in either direction for the
purpose stated.
The said half nut and its guideways are not now in this device, but the means
for moving said nut is new.
The said drill holder is operated by means of the lever P*.
This lever is pivotally attached at its inner ond, through the medium of an
extension part R to the side of the carriage B, as shown in Figure 1. G. H. aro
tuggle arms having their outer end pivotally connected to the side of carriage B,
as shown in Figure 1, the arm H having a slot as shown in broken lines so it can
have movement on its pivot. These toggle arms are pivotally counected with

page_text: part R of lever P through the medium of the links L' and K. The iuner ends
of said links are pivotally connected with each other, and to the outer end of the
upper fork of the bifurcated lever F. The link K3 having a slot so that it can
have end movement on the bolt upon which its inner end is pivoted. M and N are
arms having their inner ends respectively pivoted to the forks or arm and
pivotally connected with each other near their outer end by means of a pivot bolt
passing through longitudinal slots in such manner that each arm may have earl
movement on said pivot bolt. U is a hammer having the end of its handle S
pivotally attached to the carriage, B. Said hammer handle has a longitudinal
transverse slot in which is arranged a latch plate S pivotally held at its uppor ead,
and adapted to swing in either direction through said slot so as to be engaged
alternately by said arms M and N on either side of snid hammer handle, for the
purpose of carrying the hammer handle back against the plunger B' and thus
compress the coil spring A', which spring, when the latch plate S is released,
causes the hammer to make a forward stroke against the head J' of the drill
holder. The ends of the arms M. and N which engage said latch are so formed,
that when the hammer is carried backward to its limit, as shown in Figure 1, the
arm engaging said latch will slip off the latch and cause it to swing through the
slot in which it is located and permit the hammer to make its stroke, and so said
latch will be engaged by the opposite arm to carry the hammer again backward to
be in like mauner released and permitted to make its stroke.
In operation when the toggle arms are straightened by means of their connection
with lever 1 whcu said lever is operated, toggle arm H is caused to bear against
the inner side of the flange of nut L which carries the drill holder back against its
spring J.
When the joint of the toggle is carried in either direction beyond a line drawn
through the point of pivots with frame B, the toggle will, owing to the slot of
link K, at its connection with link L, be free, and then the drill holder spring J
will also be free to drive the drill holder and its drill forward to their work. The
carriage B is shown as having an extension having a tubular end for carrying a
gland C, the tubular end of said frame being split and its two parts are connected
by a screw Z for tightening up on said gland. B is a plunger having its outer
end pass freely through said gland, and having its inner end formed as a ball for
fitting a corresponding socket in the hammer handle so as to connect them. Said
plunger has a head on its inner end, and a coil spring A' is sleeved thereou
between its head and the inuer end of said gland. The said glaud is intended to be
turned against said coil spring for the purpose of regulating its tension to cause
the hammer to make a heavier or lighter stroke according to the quality of the
rock to be drilled.
Having now particularly described and ascertained the nature of the said iuven-
tion, and in what manner the samo is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. In a hand-power rock drilling machine, the combination of frame A, frame B
adapted to slide upon frame A and carrying a reciprocating drill bolder S and its
spring, screw rod V journalled in fraune A and having the hand wheel T on its
outer end, ratchet wheel splined on said screw shaft, and seated in a recess in
frame B, bell crank pawl K pivotally connected at its augle to gib n by means of
pin having the coil spring m for yieldingly holding said pawl at its point of
pivot, said pawl being adapted to engage and turn said ratchet wheel by means
of one of its arms, and the other arm having the lugs o for carrying between them
the flauge of nut L on the drill holder for actuating said pawl, nut L, balf nut Y
and detent latch K' all arranged to operate substantially as and for the purposo
set forth.
2. In a hand-power rock drilling machine, the combination of frame A and
frame B arranged to slide thereon, a drill holder carried by frame B and arranged
to reciprocate therein, a screw rod carried by frame A, and a bell crank ratchet

page_text: pawl K pivotally connected to sliding frame B and adapted to engage said ratchet
wheel, and adapted to be actuated by the drill holder, all arranged to operate
substantially as and for the purpose set forth.
3. In a hand-power rock drilling machine, the combination of the frame B, the
reciprocating drill holder S having the longitudinal groove P, spring bolt or
latch i having the radial armsj near its upper end, and the hollow nut A adapted
to screw into barrel and having the radial recess P¹ across its upper end for
receiving arnis and the coil spring introduced in said barrel around said latch and
between a shoulder thereon as the lower end of said nut, all arranged to operate
substantially as and for the purpose set forth.
4. In a hand-power rock drilling machine, the combination of frame B, hammer
handle S pivotally connected at its outer end to said frame, rod B' having its innor end
connected with said hammer haulle by a ball and socket joint, and having its outer
end pass free through gland C, gland C' screwed into the screw threaded extension
end of said frame B and the coil spring A' sleeved on said rod between the head
thereof and the inner end of said nut, all arranged to operate substantially as and
for the purpose set forth.
5. In a hand-power rock drilling machine, the combinations of the sliding
frame B, drill holder S' adapted to reciprocate therein, ratchet wheel I on said
drill holder, pawl 8 pivotally connected at its lower end with lever R and arranged
to engage said ratchet wheel I on one side, pawl H pivotally connected to said
pawl S and arranged to engage said ratchet wheel on its opposite side, coil
spring H for holding said pawls connected with said ratchet wheel, said ratobot
wheel and pawls being adapted to partially rotate said drill holder and drill at
each reciprocation thereof substantially as and for the purpose set forth.
6. In a hand power rock drilling machine, the combination of frame A, framo B
adapted to reciprocate on frame A, drill holder S adapted to reciprocate in
frame B and having the flanged nut or head L, ratchet wheel I, coil spring J'
sleeved on eaid drill holder, pawls S and H', spring bolt or latch i for fitting the
groove on Buid drill holder, screw shaft V ratchet wheel I splined on said screw
shaft, bell crank ratchet K having the lugs o for engaging out L, hammer U and
the meaus for actuating said drill holder and drill and hammer, all arranged to
operate substantially as and for the purpose set forth.
Dated this 19th day of August A.D. 1896.
RIVERIONS PALMER ELMORE.
Wm. P. Thompson & Co.,
Agents.