Improvements in Rock Drilling Apparatus.
Year: 1897

page_text: Date of Application, 9th Nov., 1897-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
Improvements in Rock Drilling Apparatus.
I, JOHN MORRIS HAMOR, of 2008, Norris Street, in the City of Philadelphia,
County of Philadelphia, and State of Pennsylvania, United States of America,
Machinist, 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:.
-
My invention has for its object a novel construction of valve and its connection
with the piston of the rock drill, whereby air or other pressure fluid is alternately
admitted to opposite ends of the rock drill piston, which causes it to reciprocate.
My invention consists also in providing the head of the rock drill with an
engine operated by the same air or other fluid which operates the piston, the
engine being used for the purpose of rotating the drill, so as to present different
cutting edges of the tool to the work.
I will first describe my invention as illustrated in the accompanying drawings,
and then particularly point out my invention in the claims.
In the drawings
Figure 1 is a vertical longitudinal section through the piston and valve.
Figure 2 is a section on the line 2-2, Fig. 1.
Figure 3 is a section on the line 3-3, Fig. 1.
Figure 4 is a section on the line 44, Fig. 1.
Figure 5 is a section on the line 5-5, Fig. 1.
Figure 6 is a detail perspective of valve and piston.
A represents the supporting frame of the machine, B the drill head, and B¹
the piston rod. C is the cylinder. Connected to this cylinder is the nut D
which works on the threaded shaft E, operated by the crank F, so that the
piston and the cylinder of the rock drill may be carried by rotating the handle.
32 is the piston, having the heads 6 and 61; between them is the cut-away por-
tion 62. G is the valve casing, and G₁ is the live air chamber of the valve,
to which the live air or other fluid is admitted through flexible passage G³, and G³
is the exhaust passage.
From the live air chamber G', by means of the passages 3 and 9, air passes
to the space H on opposite sides of the valve piston H, and h and h¹ are passages
leading from the space H' on opposite sides of the valve piston H to the cylinder C.
H is the valve. Leading from the chamber G¹ there are the passages h³ and h*.
The passages 3 and 4 leading to opposite ends of the cylinder.
In one position of the valve H2 the passage h³ is in communication with the
exhaust passage G3, while the passage is in communication with the live air
chamber G. Under those conditions, the piston being in the position shown in
Figure 1, the passage h¹ from one side of the valve piston H is in communication
with the exhaust, while the passage h is closed by the piston-head b, so that air
pressure is on the side of the piston H corresponding to the passage h. Under
these conditions, the piston B¹ will be moved towards the left. It will move so
until the portion 62 makes the connection with the passage h, at which time the
[Price 8d1

page_text: passage will be closed by the head b¹ of the piston. Under these conditions the
air will be exhausted from the side of the valve piston corresponding to the
passage h, and the live air on the side corresponding to the passage h¹ will
become active. This will shift the valve H2 so that the passage h will
be connected with the exhaust, and the passage h³ with the live air chamber G¹.
As a consequence live air will be admitted to the left side of the piston, and the
right hand side will be open to the exhaust, under which condition the piston will
be moved in the reverse direction until it reaches the position shown in Figure 1,
at which time the passage h will be closed by the head 6 of the piston, and the
passage h¹ open to the exhaust, and under these conditions the valve will reverse
bringing it again into the position shown in Figure 1.
So much for the operation of the valve and its control of the piston. The
advantage of such a construction as this is that the valve is a rotary valve, and
second, is at all times on both sides under the action of pressure, so that it is
always ready to become active. Again, it is very simple in construction and certain
in its action.
.
In order to perform the other novel feature of my invention, to wit: of rotating
the piston at the desired points, I prefer the following construction:
The piston B has a portion of its interior cut out so as to form a rectangular
orifice, in which rectangular orifice is placed the shaft I, upon the end of which
is mounted the ratchet wheel J operated upon by the spring pawis, j, j. These
pawls are operated in the following manner: These pawls are mounted in a ring K,
mounted loosely in the head I. Connected with this ring K is the piston k, which
piston is operated in the following manner:
In the cylinder C are the ports c, c¹, connecting with the passages h³, h4, also con-
necting with the passages, c² 3, leading to opposite sides of the piston k. In the
movement of the valve H2, the ports c, e¹ are alternately connected with pressure
and exhaust. The port e admits the air to one side of the piston k, and the port c¹
to the other side of the piston k. The movement of the piston k in one direction
causes the pawls, either j or j', to act upon the ratchet and rotate the shaft I, and
with it the piston, while, when the air is admitted to the other side of the piston k,
it causes the ring J, and with it the pawls, to be moved in the opposite direction,
preparatory for another action upon the ratchet.
In order to avoid the necessity of having a short crown tooth, or, what is the
same thing, a large number of teeth, I use the two pawls which are so set that one
or the other of the pawls is always in active position. By this arrangement the
piston is automatically turned at each stroke of the piston.
Instead of the pawls being on the ring, they may be placed on the shaft I and
the ring K internally toothed so that motion is transmitted by the movable ratchets
acting upon the pawls.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
1. In a rock drill, in combination, a cylinder, a piston having a cut-away por-
tion, a valve casing having two chambers one directly in connection with the source
of pressure supply and exhaust, the other having two passages leading to the
cylinder, a valve in one chamber and a valve piston in the other, and passages
leading from the valve chamber to the valve piston chamber on opposite sides of
the valve piston, and passages leading from the valve chamber to opposite ends of
the piston chamber.
2. In a rock drill, in combination, a cylinder, a piston in said cylinder, and
pressure and exhaust passages for controlling the reciprocation of said piston, a
spindle upon which said piston is adapted to reciprocate and with which it is
adapted to rotate, a ratchet mounted upon said spindle, a ring provided with a bear-
ing upon which it is adapted to rotate concentric with the piston rotation, and

page_text: connection between said ring and the spindle whereby when the ring is moved in
one direction the spindle is rotated, a secondary piston connected with said ring, a
piston chamber for said piston and connection between opposite sides of said piston
and the main cylinder adjacent to the pressure and exhaust passages.
3. In a rock drill, in combination, a cylinder, a piston in said cylinder and
pressure and exhaust passages for controlling the reciprocation of said piston, a
spindle upon which said piston is adapted to reciprocate and with which it is adapted
to rotate, a ratchet mounted upon said spindle, a ring provided with a bearing upon
which it is adapted to rotate concentric with the piston rotation, a pawl connected
with said ring adapted to coact with said ratchet, a secondary piston connected
with said ring, a piston chamber for said piston and connection between opposite sides
of said piston and the main cylinder adjacent to the pressure and exhaust passages
whereby when in the operation of the main piston pressure is admitted to one side
of the secondary piston the pawl is moved into operative position, and when pressure
is admitted to the opposite side of said secondary piston the pawl is operated to
turn the ratchet and with it the main piston.
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Ja of Naambo 1807
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.