Year: 1899

page_text: I, JAMES MCCULLOCH, of Portreath, Illogan, in the County of Cornwall,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in and relating to the kind of rock
drills described in the Specification of British Patent No. 15403 of 1898.
The invention has for its object the more efficient working of the distribution
valve and the reduction of wear and leakage.
According to this invention, instead of delivering the motive fluid onto the top of
the distribution valve as in the aforesaid specification, the said fluid is admitted
at one end of the valve and passes longitudinally through the body thereof to the
working cylinder ports, thus reducing the pressure on the top of the valve and
consequently the wear on the bottom side or face thereof.
I may also provide the said valve with two wings or vanes working fluid tight
in suitable recesses in the wall of the valve chest (instead of one as in the afore-
said specification) whereby rocking movement is imparted thereto. These wings
are operated by the motive fluid the admission and exhaust of which is controlled
by the drill piston, passages being formed in the valve which put the top and
bottom recesses in which the said wings work in communication so as to enable the
actuating fluid to act upon opposite faces of the top and bottom wings simul-
taneously. The construction balances the pressure of the motive fluid acting on the
top and bottom parts of the valve where the said wings or vanes are situated, and
serves also to keep the said valve to its face.
Where only one such valve wing or vane is employed the motive fluid may.be
similarly admitted to the top and bottom of the valve to balance it and keep it to
its face
When the drill is working at different angles it is necessary to keep the distri
bution valve in position after the motive fluid has acted upon the wing or wings,
and this is effected by providing means whereby fluid pressure may be caused to
act lengthwise upon the valve. Such means may conveniently consist of a circular
recess formed in the end of the valve at the point when the actuating fluid is
admitted to the inlet part, while the opposite end thereof works on a pivot in the
wall of the valve chest to take up wear.
A trigger is also provided for working the valve by hand when necessary.
Datad this 8th day of March 1899
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: I, JAMES MCCULLOCH, of Portreath, Illogan, in the County of Cornwall,
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:-
This invention relates to improvements in the kind of rock drill described in
the Specification of British Patent No. 15403 of 1898 and has for its object the more
efficient working and the reduction of wear of the distributing valve, and the
duminution of leakage of the actuating fluid.
According to the said prior specification, the fluid pressure distributing valve has
a rocking motion and is actuated by a wing or vane working fluid-tight in a suitable
chamber. The arrangement is such that as the piston of the drill travels to and
fro, it covers and uncovers suitable subsidiary ports in the drill casing, thereby
admitting motive fluid alternately to opposide sides of the wing or vane and so
causing the latter to swing from side to side and operate the valve.
According to the present invention, instead of delivering the motive fluid on
to the top of the distributing valve as described in the aforesaid specification, the
said fluid is admitted at one end of the valve and passes longitudinally through a
suitable passage in the body thereof to the working cylinder ports, thus reducing
the pressure on the top of the valve and consequently the wear on the bottom side
or face thereof.
I furnish the said valve with two wings or vanes working fluid tight in suitable
recesses in the wall of the valve chest, instead of with one such wing as in the
aforesaid prior specification. The admission and exhaust of the motive fluid for
operating these wings are controlled by the drill piston through ports in the drill
casing which ports put the opposite sides of ene of the wing chambers alternately
to Huid pressure and exhaust, and through passages which put the
sides of cach one of the said recesses or chambers in communication
respectively with the opposite sides of the other of said recesses or chambers so
as to enable the actuating fluid to act upon opposite faces of the two wings simul-
taneously.
I also form a circular recess at that end of the distribution valve at which the
actuating fluid is admitted, in order to keep the said valve in correct position when
working with the drill at an angle to the horizontal position; and I pivot the
opposite end of the said valve on a conical pivot, in order to take up wear.
In order that my invention may be clearly understood and readily carried into
effect I will proceed to describe the same more fully with reference to the accom-
panying drawings in which:-
Figure 1 is a plan and Figure 2 is a sido elevation of that part of a rock drill
to which my invention refers.
Figure 3 is a cross section on line A-A Figure 1.
Figure 4 is a section on line B-B Figure 3.
Figure 5 is a section on line C-C Figure 3.
Figure 6 is a section of the valve and pivot on line D-D Figure 3.
Figure 7 is a section of the valve on line E-E Figure 3.
Figure 8 is a section on line F-F Figure 5.
a is the distributing valve provided with a longitudinal port a¹ and exhaust

page_text: ports a, a. The ports a², a lead to the exhaust outlet j¹. bare vanes or
wings formed on opposite sides of the valve a, and bare fluid tight chambers
or recesses in the valve chest or casing, in which the wings bb respectively oscil-
late. care passages which pass transversely in opposite directions through the
valve a so as to connect the chambers or recesses 6' 6º in such manner that the
motive fluid is permitted to act simultaneously upon cne side of one wing & and
upon the opposite side of the other wing b. bare blocks or buffers adapted to
slide respectively in fluid tight recesses in the drill casing. The ends of
these buffers or blocks at one extremity are reduced so as to form the
shoulders 65. These reduced ends of the buffers project a short distance into the
wing chamber and each of the buffers is normally retained in this projecting
position by a spring . The aforesaid shoulders on the buffers engage with corres-
ponding projections in the drill casing to prevent the said buffers projecting too
far into the wing chamber are annular passages respectively surround-
ing the buffers 688 are passages in the buffers respectively connecting
the annular passages with the opposite sides of the wing chambers : d d
are passages in the drill casing, respectively connecting the annular passages bi
with the drill cylinder. is an annular recess formed in one end of the valve a, for
the purpose of permitting the fluid pressure to act lengthwise upon the valve and
thus maintain the said valve in its correct position when working with the drill
at an angle. f is a conical socket formed in the opposite end of the valve a, and fi
is a conical pivot engaging with the socket f; the construction of this pivot
and socket being adapted to take up wear.
h is the working cylinder. i is the piston provided with a central annular
space is an exhaust passage leading from the cylinder 4, to the exhaust
outlet k are passages leading from the distributing valve to the respective
ends of the cylinder h.
When the drill is in operation, the valve a opens one passage k to the fluid
pressure by means of the port a', while it put the other passage to exhaust
by means of one of the ports a², and thus causes the piston to reciprocate in a
manner that is well understood.
As the piston nears the end of its stroke it uncovers one of the passages d
to the fluid pressure in the cylinder h, and opens the other passage d to the
exhaust passage through the annular space ', thus admitting fluid pressure to
one side of the chamber or recess 2 and putting the opposite side of the
said chamber to exhaust. As the passages ce connect the opposite sides of the
chambers or recesses & as aforesaid, the motive fluid is thus permitted to act simul-
taneously upon one side of one wing and upon the opposite side of the other
wing b, while the other sides of these wings are put to exhaust, thereby reversing
the distributing valve and balancing the pressure of the motive fluid acting on the
top and bottom parts of the said valve, and also holding the said valve to its face.
As the valve oscillates, the lower wing alternately strikes the ends of the
spring buffers 3 63. The valve is thus cushioned and hammering is prevented.
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
in a rock drill is:-
1. A cylindrical distributing valve provided with a central longitudinal inlet
port, substantially as and for the purpose specified.
2. A rocking or oscillating valve provided with two wings or vanes working in
chambers or recesses which communicate in such a manner that the motive fluid
will act as described upon the two wings or vanes, for the purpose specified.
3. In the valve referred to in Claim 1, an annular recess in the fluid pressure
inlet end of said valve which recess communicates with the fluid pressure, and a
conical pivot at the end of the valve remote from the fluid pressure inlet, for the
purposes specified.

page_text: 4. The distributing valve, constructed arranged and operating substantially as
described with reference to the accompanying drawings, for the purposes specified.
Dated this Sth day of January 1900.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.