Improvements in and relating to I
Year: 1897

page_text: Date of Application,
40th A
May
1907
Complete Specification Left, 27th Nov., 1897-Accepted, 5th Feb., 1898
די
Complete Specification Left, 27th Nov., 1897-Accepted, 5th Feb., 1898
PROVISIONAL SPECIFICATION.
Communicated from abroad by THE INGERSOLL SERGEANT DRILL COMPANY, a
Corporation organized under the laws of the State of West. Virginia, United
States of America, and having its principal business office at No. 26, Cortlandt
Street, in the City of New York, in the State of New York, United States
of America.]
Improvements in and relating to
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
-
This invention relates to valves and valve gear which are or may be applicable
to direct-action engines generally but more especially to rock drilling engines for
effecting the induction of the steam or other motive agent to and the eduction of
such agent from the cylinder of the engine at opposite ends alternately, and it
relates particularly to slide valves for such engines operated by a tappet lever the
arms of which project within the cylinder and are operated upon by tappet surfaces
on the piston.
In carrying my invention into practice I provide the piston in its head with an
annular or lateral recess the ends of which constitute the tappet surfaces, and the
valve, with a tappet lever for operating the same, the said lever working on a
fixed pin within and through an opening in the top or one side of the cylinder
and entering the cavity within the valve-chest which receives the steam or other
motive fluid from the boiler or other source of supply. The valve-chest is com-
posed of two separate pieces one of which, which is the body of the chest, is placed
directly on the cylinder, and the other is placed over the former in the form of a
cap or cover. The cap or cover part is made separate from the cylinder to permit
the introduction of the valve, but the other part or body part might be a portion
of the cylinder, being represented as made separate for convenience of construction
only.
The valve seat which is formed in the back of the valve-chest, that is to say,
in the inner face of the cap or cover and faces towards the cylinder, has its longi-
tudinal profile of the form of an arc the centre of which is coincident with the
axis of the pin of the tappet lever. The valve which faces away from the cylinder,
has its face of a corresponding convex arc profile and has on its back a socket
which projects towards the bore of the cylinder for the reception of the arm of the
three-armed tappet lever, the other two arms of which project through the opening
into the cylinder to be acted upon alternately by the tappet surfaces of the piston.
The valve represented is of the kind known as the double D slide and the arrange-
ment of the ports in its seat are such as are common to said valves, and therefore
it is only necessary to here explain that the ports communicate with the cylinder
at opposite ends thereof respectively through passages formed in the cover, and
corresponding passages in the body of the valve-chest and passages in the cylinder,
and that the exhaust ports which are practically only one port divided by a bridge,
Di Q71

page_text: communicate through an outlet in the cover with the exhaust pipe of the engine
which is connected with that outlet.
In
The operation of the three-armed tappet lever produced by the tappet surfaces
of the piston on the tappet arms of the said lever, produce at each stroke of the
piston the necessary movement of the valve to produce the induction of the steam
or motive agent from the cavity of the valve-chest to the cylinder, and the eduction
of said agent from the cylinder through the port in the valve-chest cover.
this operation the space within the annular recess in the piston is always kept
filled with the live steam or motive agent from the cavity of the valve-chest and
hence pressure on the piston in opposite directions is balanced except as to the
admission of the steam or other agent. by the valve to opposite ends of the cylinder
alternately for producing the reciprocating movement of the piston. The pressure
within the valve-chest acting on the back of the valve holds the latter to its seat
while the tappet arm g acts on the valve without friction by reason of the face of
the valve being concentric with the pin on which the tappet lever oscillates.
Dated this 15th day of May 1897.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, W.C., Agents for the Applicant.
Saving to side valves.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, London, W.C., da 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 valves and valve gear which are or may be applicable to
direct-action engines generally but more especially to rock drilling engines for effect-
ing the induction of the steam or other motive agent to and the eduction of such agent
from the cylinder of the engine at opposite ends alternately, and it relates particu-
larly to slide valves for such engines operated by a tappet lever the arms of which
project within the cylinder and are operated upon by tappet surfaces on the piston.
My invention is illustrated in the accompanying drawing in which
Figure 1 represents a central longitudinal section of a portion of the cylinder
and of the valve-chest, valve and valve gear of a rock-drilling engine embodying
our invention;
Figure 2 an inverted plan of the valve-chest cover showing the face of the valve
seat;
Figure 3 a transverse section on line 3, 3, of Figure 1;
Figure 4 a transverse section on line 4, 4, of Figure 1; and
Figure 5 a face view of the valve.
Similar letters of reference designate corresponding parts in the several figures.
A designates a portion of the engine cylinder, and B the piston having in its
head an annular or lateral recess a the ends a¹ a³ of which constitute the tappet
surfaces.
CC designate the valve-chest, D) the valve Figures 1, 3 and 5, and E the tappet
lever for operating the said valve, the said lever working on a fixed pin c within
and through an opening d Figures 1 and 3 in the top or one side of the cylinder
and entering the cavity d¹ within the valve-chest which receives the steam or other
motive fluid from the boiler or other source of supply through an inlet F and
passages f, Figure 4. The valve-chest CC is represented as composed of two
separate pieces one of which C, which is the body of the chest, is placed directly
on the cylinder, and the other C is placed over C¹ in the form of a cap or cover.

page_text: The cap or cover part C is made separate from the cylinder to permit the intro-
duction of the valve D, but the part. C¹ or body part might be a portion of the
cylinder, being represented as made separate for convenience of construction only.
The valve seat 6 Figure 2 which is formed in the back of the valve-chest, that
is to say, in the inner face of the cap or cover C and faces towards the cylinder,
has its longitudinal profile of the form of an arc the centre of which is coincident
with the axis of the pin c of the tappet lever. The valve D which faces away from
the cylinder, has its face of a corresponding convex arc profile and has on its
back a socket s which projects towards the bore of the cylinder for the reception of
the arm g of the three-armed tappet lever E, the other two arms hh of which
project through the opening G into the cylinder to be acted upon alternately by
the tappet surfaces a¹ a² of the piston.
The valve D represented is of the kind known as the double D slide and the
arrangement of the ports i¹ and j in its seat are such as are common to said
valves, and therefore it is only necessary to here explain that the ports i com-
municate with the cylinder at opposite ends thereof respectively through pass-
ages kk formed in the cover C, and corresponding passages in the body C¹ of
the valve-chest and passages mm' in the cylinder, and that the exhaust ports j, j,
which are practically only one port divided by a bridge, communicate through an
outlet n in the cover with the exhaust pipe of the engine which is connected with
that outlet.
The operation of the three-armed tappet lever produced by the tappet sur-
faces a¹² of the piston on the tappet arms hh of the said lever, produce at each
stroke of the piston the necessary movement of the valve to produce the induction
of the steam or motive agent from the cavity of the valve-chest to the cylinder,
and the eduction of said agent from the cylinder through the port in the valve-
chest cover C. In this operation the space within the annular recess a in the piston
is always kept filled with the live steam or motive agent from the cavity of the
valve-chest and hence pressure on the piston in opposite directions is balanced
except as to the admission of the steam or other agent by the valve to opposite
ends of the cylinder alternately for producing the reciprocating movement of the
piston. The pressure within the valve-chest acting on the back of the valve holds
the latter to its seat while the tappet arm g acts on the valve without friction by
reason of the face of the valve being concentric with the pin c on which the tappet
lever E oscillates.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondents, I declare that what I claim is:
-:
a
The combination with an engine cylinder and a piston therein provided with
tappet surfaces, of 22 valve-chest on the said cylinder containing
valve seat of concave arc-formed longitudinal profile facing towards the
cylinder, a valve having a corresponding convex arc-formed longi-
tudinal profile facing away from the cylinder, and a three-armed
oscillating tappet lever having its axis of oscillation co-incident with the
centre of the arc of the valve and seat, one arm of the said lever engaging with the
valve at the back thereof and its other two arms constituting tappets to be acted
upon by the said tappet surfaces, substantially as herein described.
י
1 1007
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.