Improvements in Slide Valve Operating Mechanism.
Year: 1898

page_text: Date of Application, 4th June, 1898
Complete Specification Left, 6th Mar., 1899-Accepted, 15th Apr., 1899
Improvements in Slide Valve Operating Mechanism.
I, ARTHUR SAMUEL FRANCIS ROBINSON, of the Vale of White Horse Iron
Works, Wantage, in the County of Beiks, Engineer, do hereby declare the
nature of this invention to be as follows: :―
This invention relates to a construction of valve operating mechanism whereby
aslide valve that is not in a direct line with the eccentric rod by which it is
driven, can be arranged and operated in a simple and advantageous manner and
so that an eccentric rod of increased length can be used, thus rendering the in-
duectness of the centre lines of the slide valve and eccentric 1ods advantageous,
and enabling the slide valve to be made to work close to the motor cylinder
with which it is used so as to obviate the use of the long steam passages and the
consequent waste of steam which obtain when the valve 16 arranged to work at a
considerable distance from its cylinder
According thereto I arrange the slide valve spindle or rod to work through
stufhing boxes at the two ends of the valve chest, which is cast in one with the
motor cylinder, and connect each end of the rod to a suitably guided external
slide bar o fiame that extends around the two ends and outer side of the valve
chest and 18 suitably connected to the eccentric rod or equivalent valve operating
device so as to be reciprocated therefrom
In one aangement the projecting ends of the valve rod are screw threaded
and fitted with uuts between which are clamped the ends of a metal ☐ shaped
frame the long side and ends of which are or may be in one piece This frame
extends away from the slide rod, and its long side, which is arranged parallel
to the slide valve rod, is arranged to work against planed surfaces on the out-
side of the cylinder casting, the said frame being kept in position against these
surfaces by guide pieces that are shaped to fit the said long side of the frame
The arrangement is such that the connected frame and valve rod form a very
firmly supported parallelogiam frame which is provided with a driving pin.
This diving pin, which is made laige in diameter though narrow in width so as
to resemble a disc, is fixed to the long side of the frame between the guide pieces
by suitable means such as studs and nuts. The pin is made in halves each of
which is fixed in place by a stud and nut with the aid of a clamping bar or plate.
One half of the pin has the stud hole therein in the form of a slot, and adjust-
able wedges are airanged between the two halves of the pin so that the one half
of the pin formed with a slot can be moved from the other to take up wear.
The pin is flanged on the side next the frame, and around it is placed an eye
or strap that is forged in one with or fixed to the valve operating eccentric rod
and is held in position on the pin by the clamping bar or plate which extends
across the pin and eye or strap and is held in position by the studs and nuts
above referred to.
In another arrangement the eccentric rod is jointed to one end of the frame so
as to drive the combined slide valve rod and frame from a point between the

page_text: long side of the frame and the slide valve 10d
The long side and ends of the
frame may be made in separate parts, the end parts being clamped between
nuts on the valve rod and a second 1od forming the outer long side of the frame
which is mounted to slide in guides ou the valve chest, and whose outer ends
may be arranged to slide in additional guides projecting from the cylinder ends
רד
T1000
I, ARTHUR SAMUEL FRANCIS ROBINSON, of the Vale of White Horse Iron
Works, Wantage, in the County of Berks, 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 a construction of valve operating mechanism whereby
a slide valve that is not in a duect line with the eccentric rod by which it is
duven, can be arranged and operated in a simple and advantageous manner and
so that an eccentric iod of increased length can be used, thus rendering the in-
dnectness of the centie lines of the slide valve and eccentric 1ods advantageous,
and enabling the slide valve to be made to work close to the motor cylinder
with which it is used so as to obviate the use of the long steam passages and the
consequent waste of steam which obtain when the valve is arranged to work at a
considerable distance from its cylinder
According thereto I arrange the slide valve spindle o rod to work through
stuffing boxes at the two ends of the valve chest, which is cast in one with the
motor cylinder, and connect each end of the 1od to a suitably guided external
slide bar o frame that extends around the two ends and outer side of the valve
chest and is suitably connected to the eccentric rod or equivalent valve operating
device so as to be reciprocated therefrom
Fig. 1 of the accompanying illustrativo drawings shows, partly in section
and partly in elevation, a valve chest and slide valve with one arrangement of
valve operating mechanism according to my invention
Fig. 2 is an elevation shewing the slide bar or frame at right angles to the
position shewn in Fig. 1
In this arrangement the projecting ends 1ª, 16 of the valve rod 1 are screw
threaded and fitted with nuts between which are clamped the ends 2*, 2 of a
metal shaped frame 2 the long side and ends of which are or may be in one
piece as shown. This frame extends away from the alude valve rod, and its
long side, which is arranged parallel to the slide valve rod 1, 18 arranged to work
against planed surfaces on the outside of the cylinder casting 3, in which the
valve chest 3* is formed, the said frame being kept in position against these our-
faces by guide pieces 4 and 4 that are shaped to fit the said long side of the
frame. The arrangement, as will be seen, is such that the connected frame 2,
2ª, 2b and valve rod 1 form a very firmly supported parallelogram frame which
is provided with a driving pin 5 This driving pin, which is made large in
diameter though narrow in width so as to resemble a disc, is fixed to the long
side of the frame between the guide pieces 4, 4" by suitable means such as studs

page_text: and nuts, or, preferably, as shown, by set sciews 6. The said pin is made in
halves as shewn, each half being fixed in place by one of the set screws 6 with
the aid of a clamping bar or plate 8. One half of the pin. 5 has the stud hole
therein in the form of a slot as shown at 5" and adjustable wedges 9 are arranged
between the two halves of the pin so that the one half of the pin formed with
the slot 5* can be moved from the other to take up weal The pin is, on the
side next the frame, formed or provided with a flange 5b and around it is placed
an eye or strap 10 that is forged in one with oi fixed to the valve operating
eccentric rod 10 and 18 held in position on the pin by the clamping bar or plate 8_
which extends across the pin and eye or strap and is held in position by the set
screws 6 above referred to
Fig. 3 shews in side elevation another arrangement in which the eccentric
rod 10 18 Jointed to one end 2ª of the frame 2 so as to drive the combined slide
valve rod 1 and frame 2, 2, 2b from a point between the long side of the frame
and the slide valve rod The long side 2 and ends 2", 2b of the frame may, as
shewn, be made in separate parts, the end parts being clamped between nuts 11
on the valve rod 1 and nuts 12 on a second rod 2 that forms the outer long
side of the frame and is mounted to slide in guides 4, 4* on the valve chest
The outer ends of the rod 2 may be arranged to slide in additional guides 13
projecting from the ends of the valve chest, and each formed in one with the
corresponding guide 4 or 4 as shewn
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed I declare that what I
claim 15-
1. Slide valve operating mechanism comprising an external slide bar or frame
that extends around the two ends and outer side of the valve chest and is cou-
nected to the two projecting ends of the slide valve iod, and an eccentric 1od or
equivalent that is attached to the said slide bar or frame at a point further from
the cylinder than the axial line of the slide valve rod, substantially as herein
described
2. In slide valve operating mechanism the combination of a slide bar or frame
mounted to reciprocate and connected at its ends to the projecting ends of the
slide valve rod and an eccentric 1od or equivalent reciprocating means jointed to
the said slide bar or frame at a point between the ends thereof, substantially
as described for the purpose specified
3 The improved valve operating mechanism constructed and operating sub-
stantially as herein before descubed with reference respectively to and shewn in
Figs. 1 and 2, and in Fig 3 of the drawings annexed."
Datcu
-oth day of March 1030
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, WC.,
Chartered Patent Agent.