Improvements in Rotating Devices for Rock Drills.
Year: 1894

page_text: Date of Application, 10th July, 1894
Complete Specification Left, 30th Mar. 1895-4ccepted, 4th May, 1895
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE INGERSOLL SERGEANT DRILL Co.
(a corporation organised under the laws of the State of West Virginia,
United States of America), of No 26, Cortlandt Street, in the City of
New York, United States of America.]
Improvements in Rotating Devices for Rock Drills.
I PHILIP ARTHUR NEWTON of The Office for Patents, 6 Bream's Buildings,
Chancery Lane in the County of London; Patent Agent, do hereby declare the
nature of this invention to be as follows:-
This invention relates to rock drills, such as are actuated by steam or compressed
air, and in which the rotation of the drill is produced by the combination of a
'" rifle
ratchet ring and pawls, with a spirally grooved or fluted bar, known as a
bar," fitting a nut in the piston which carries the drill.
According to the present invention, the' pawls which form part of the ratchet
connection between the spirally grcoved rifle bar which 'fits the nut carried by the
drill piston, and the drill cylinder, are mounted as follows:-
These pawls are each made with a cylindrical stock which fits-pivotally into a
cylindrical seat or socket formed by boring through the head of the rifle bar
parallel with the axis thereof. At the backs of the so fitted pawls, are spiral
springs for the purpose of pressing them out toward the ratchet ring, which is
fitted within the drill cylinder. The said springs act through the heads of plunger-
like pins, which, with the said springs, are inserted into sockets bored tangentially
in the head of the rifle bar. The cylindrical socket bored in the rifle bar head
for the reception of the stocks of the swinging or pivotted pawls, have lateral
openings at the side of the head, but the said openings have a width less than the
diameter of the sockets, so that the sockets themselves are capable of containing
more than one balf of the circumference of the stocks, with the result, that the
stocks themselves constitute their own pivots, and are self pivotted in the sockets,
without the need of separate pins or other journals to form pivots.
The pawls, pins, and springs, constructed and applied within the rifle bar head,
s herein described, make a very substantial engagement between the rifle bar and
atchet ring, to hold the bar, and so to cause the drill piston and drill to turn
luring the movement of the said piston along the bar in one direction, yet permit
he free turning of the bar by the piston during the movement of the latter in the
ther direction.
Dated this 10th day of July 1894.
NEWTON & SON,
Agents for the Applicant.

page_text: I PHILIP ARTHUR NEWTON of The Office for Patents, 6 Bream's Buildings,
Chancery Lane, in the County of London, Patent Agent, 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 :-
This invention relates to rock drills such as are actuated by steam or compressed
air, and in which the rotation of the drill is produced by the combination of a
ratchet ring and pawls, with a spirally grooved or fluted bar, known as a
"rifle-
bar," fitting a nut in the piston which carries the drill.
The nature of the invention will be described with reference to the accompanying.
drawing, and its novelty set forth in claims.
Fig. 1 represents a central longitudinal section of as much of a rock drill as is
necessary to illustrate the invention.
Fig. 2 is a longitudinal view of the rifle-bar.
Fig. 3 is an end view of the rifle-bar and its pawls, and the ratchet ring.
Fig. 4 represents a transverse section of the head of the rifle-bar and the ratchet
ring in the line xx of Fig. 1.
Similar letters of reference designate corresponding parts in all the figures.
E is the drill cylinder and F the piston. A is the ratchet ring, which is
represented like the ratchet ring cominonly employed in rock drills, and which
may be held within the drill cylinder E in any known or suitable manner.
B is the rifle-bar, grooved or fluted spirally to fit the nut d in the drill piston F,
and having in its head B', the swinging pawls C C, which engage with the ratchet
ring A, to prevent the rotation of the rifle bar, and so produce the turning of the
piston and the drill, when the piston moves longitudinally in one direction, but
which run over the teeth of said ring, and permit the bar to turn, when the piston
moves in the opposite direction.
The swinging pawls C C are each made with a cylindrical stock a, which fits
pivotally into a cylindrical seat or socket c, formed by boring through the head B¹
of the bar B, parallel with the axis thereof. At the backs of the so-fitted pawls
are applied spiral springs D, for the purpose of pressing them out towards the
ratchet, the said springs acting through the heads of plunger-like pins b, which,
with the said springs, are inserted into sockets bored tangentially in the head B³,
the heads of the said pins, which are pressed against the pawls, fitting the said
tangential sockets, and protecting the springs which are coiled around the smaller
portions of the pins behind the said heads.
The cylindrical sockets c, provided in the rifle bar head, have lateral openings b, b,
at the sides of the head, but said openings have, as shown in Figs. 3 and 4, a width
less than the diameter of the sockets, so that the sockets themselves are capable
of containing more than half the circumference of the stocks, and that the stocks
themselves constitute their own pivots, and are self-pivotted in the sockets, without
the need of separate pins, or other journals, to form pivots.
The ratchet ring A may be held in place in any suitable manner. It is
represented in Fig. 1 as fitted into a counter bore in the rear end of the cylinder,
and clamped therein between two rings G and H, of which G rests against the
shoulder e, in which the counterbore of the cylinder E terminates, and H is fitted
into an annular head E', bolted by bolts, which are not visible in the drawing, to
the back end of the cylinder. The ring H is kept in place by a spring which is
held against it by bolts J, passing through the front cylinder head E³, and the
annular back bead E'. By screwing up the nuts i on these bolts J, more or less,
the ratchet ring is held more or less tightly, but is always held securely enough to
be prevented from turning under ordinary circumstances, and yet permitted to turn

page_text: in case of any unusual resistance to the turning of the piston and drill from any
cause, as by the drill striking a flaw in the rock, and so to prevent breakage
of parts.
The thickness of the head B₁ of the rifle-bar B is slightly less than that of the
ratchet ring A, so that it may turn freely between the rings G, H. These rings
confine the pawls in place in a direction lengthwise of the rifle bar.
The pawls, springs, and pins, constructed and applied within the rifle-bar head,
as herein described, make a very substantial engagement between the rifle bar and
ratchet ring, to hold the bar, and so to cause the drill piston and drill to turn
during the movement of the said piston along the bar in one direction, yet permit
the free turning of the bar by the piston during the movement of the latter in the
other direction.
Having now particularly described and ascertained the nature of my said. inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination with the ratchet ring, of the rifle-bar provided with swinging
pawls located and self pivotted within its head, substantially as herein set forth.
2. The combination with the ratchet ring, of the rifle-bar having, in its head,
cylindrical sockets parallel with its axis, and the swinging pawls having stocks of
cylindrical form, constituting pivots fitted to, and retained by and within, the said
sockets, substantially as herein set forth.
NEWTON & SON,
Agents for the Applicant.