Improvements in Valve Gear for Direct-action Engines.
Year: 1896

page_text: Date of Application, 11th Aug., 1896
Complete Specification Left, 4th May, 1897-Accepted, 12th June, 1897
[Communicated from abroad by THE INGERSOLL-SERGEANT DRILL COMPANY
(a corporation organized under the laws of West Virginia, United States of
America), of No. 26 Cortlandt Street, in the City of New York, U.S.A.]
Improvements in Valve Gear for Direct-action Engines.
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 is more especially designed for operating the valves of direct-
ion engines which work at a high velocity, or with a very rapid repetition of
the stroke of the piston, and a sudden arrest of the stroke, such, for example, as an
engine the piston rod of which carries the bits of a stone-channelling machine. In
such machines it has heretofore been difficult to obtain, between the piston rod and
a reciprocating valve, a connection for working the valve from the said rod that
would endure for any considerable length of time, the jar being so great that the
connections heretofore employed have been liable to frequent breakage or
derangement. One of the requisites of the valve gear for such engines is that it
shall consist of the smallest possible number of parts that can be affected by the
jarring action, and the object of this invention is to provide such a valve gear.
To this end I combine with the piston rod the valve which controls the induction
and eduction of the motive fluid to and from the engine, by means of a sleeve of
tubular form supported pivotally on the engine, so as to be free to oscillate, and
capable of receiving an oscillating atm, pirotted to the piston rod.
This arm is fitted to slide freely within the pivotted sleeve, and connected with
the sleeve, between its pivotal support and the piston rod, is the rod of the valve
which controls the action of the engine. As, therefore, the piston reciprocates in
the working cylinder, it will, through its pivotted arm, rock the sleeve, and cause
it to impart the requisite movements to the valve. Thus, the movement of the
valve is effected without any striking action which would be liable to produce a jar,
there being no relative movement between the oscillating arm and the sleeve, except
the said sliding movement.
Dated this 11th day of August. 1896.
NEWTON & SON,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Valve Cear for Direct-action Engines.
I PHILIP ARTHUR NEWTON of The Office for Patents, 6 Bream's Buildings,
Chancery Lane in the County of London, Pateut 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 is more especially designed for operating the valves of direct-
action engines which work at a high velocity, or with a very rapid repetition of the
I PHILIP ARTHUR NEWTON of The Office for Patents, 6 Bream's Buildings,
Chancery Lane in the County of London, Pateut 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 is more especially designed for operating the valves of direct-
action engines which work at a high velocity, or with a very rapid repetition of the

page_text: stroke of the piston, and a sudden arrest of the stroke, such, for example, as an
engine the piston rod of which carries the bits of a stone channelling machine. In
such machines it has heretofore been difficult to obtain, between the piston rod and-
a reciprocating valve, a connection for working the valve from the said rod that
would endure for any considerable length of time, the jar being so great, that the
connectious heretofore employed have been liable to frequent breakage or
derangement. One of the requisites of a valve gear for such engines is, that it
shall consist of the smallest possible number of parts that can be affected by the
jarring action, and the object of this invention is to provide such a valve gear.
The nature of the improvement will be described with reference to the
accompanying drawing, and its novelty pointed out in claims.
Fig. 1 represents a vertical sectional view of such parts of the bit-operating
engine of a stone-channelling machine as are necessary to illustrate the invention.
Fig. 2 is a plan view of the same.
Similar letters of reference designate corresponding parts in all the figures.
A A designate parts of the cylinder of the engine; B the piston rod working
through a stuffing box A' in the cylinder head; C the valve chest; and D
the reciprocating valve, to the operation of which this invention is applied. In
this example, the valve is the auxiliary valve for controlling a steam-actuated
induction and eduction valve.
The valve gear consists principally of three parts or pieces, viz., a rocking
sleeve E of simple tubular form, an arm F which connects the said sleeve with the
head of the piston rod B, and a rod G which connects the said sleeve directly with
the head a of the valve stem. The sleeve E is arranged to rock in planes parallel
with the length of the piston rod on a pin b which is carried by a bracket H rigidly
affixed to the cylinder head A'. The arm F is carried by a pin c, which is attached
to the upper or outer end of the piston rod B by means of a clamp I, the said pin c
being parallel with the pin b. The said arm is fitted to slide lengthwise through
the sleeve. The sleeve has, on its exterior, two projecting lugs, one for the
reception of the pin b before mentioned, and the other for the reception of a
pin e with which the valve rod G is connected, and which forms a direct
connection through the valve rod between the sleeve and the valve D. In the
example represented, the part of the arm F which passes through the sleeve, is
simply turned in cylindrical shape to fit within and slide through the sleeve.
The position occupied by the said pin is opposite a point midway between the
points reached by the pin c at the two extremities of the stroke of the piston
rod B. The connection of the valve rod G with the sleeve E by the pin e, is
at a distance from the pin 6 in proportion to the length of the stroke of the
piston and the length of the stroke of the valve. In the example represented, this
connection e is between the pins b and c.
The operation of this valve gear will be readily understood by reference to
Fig. 1, in which the piston rod B, the sleeve E, and the arm F, are respectively
shown in the two positions which they occupy at the extremities of the stroke
of the piston rod. As the piston rod makes its stroke in either direction, it
carries with it the attached end of the arm F, and so produces the rocking
movement of the sleeve E upon the pin b, and, in so doing, the said arm slides
freely back and forth through the sleeve. This movement of the sleeve produces
the movement of the valve without any striking action, which would be liable
to produce a jar, there being no relative movement between the arm E and
the sleeve, except the said sliding movement.
This invention is applicable to engines worked by steam, compressed air, or other
motive fluid.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
from abroad, I declare that what I claim is :-
1. In a direct-action engine, the combination with the piston rod and the valve

page_text: which controls the induction and eduction of the motive fluid to and from the engine,
of a sleeve of tubular form, a pivotal support upon which said sleeve is capable of
oscillation, an oscillating arm pivoted to the piston rod, and fitted to slide within
the sleeve, and a direct connection between said sleeve and the valve, substantially
as herein described.
2. In a direct-action engine, the combination with the piston rod and a valve
rod for operating the valve which controls the induction and eduction of the motive
fluid to and from the engine, of a sleeve of tubular form having two projecting
lugs, a support affixed to the engine, a pivotal pin connecting said sleeve through
one of its lugs with said support, a pivotal pin connecting said sleeve by its other
lug with the valve rod, and an arm pivoted to the piston rod, and sliding through
the said sleeve, substantially as herein set forth.
Dated this 26th day of April 1897.
NEWTON & SON,
Agents for the Applicant.