Year: 1887

page_text: [Communicated from abroad by HENRY ROLAND FAY, of Boston, Massachusetts,
United States of America, Engineer.]
I, HENRY HARRIS LAKE of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex, 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 relates to valve gear designed for use upon engines of any class. I
will however illustrate it as applied to locomotives.
My invention has for its object. the construction and arrangement of valve gear
mechanism, so applied as to obtain in its use, when operating a locomotive cylinder,
single valve, whether of piston or slide in form, balanced, partially balanced, or not
balanced in arrangement, in such a manner as to afford an independent adjustable lead
and cut off device, of such a character as will permit the more economical and
efficient use of steam, and will also permit the operating of a locomotive ahead or
back, with exactly the same efficiency, except what may be due to the slight angularity
of the valve gear motions.
Fig. 10 represents my valve gear in side elevation, in full gear ahead, as applied to
one side of a locomotive, with main crank pin at lower quarter, showing the main
driving axle in section, part of one side of the frame, a sectional view of the cylinder
and valve and a view of other parts of a locomotive requisite to define relative position.
of valve gear.
Fig. 11 represents my valve gear, in plan, in midgear, as applied to one side of a
locomotive, showing a portion of main driving axle, main driving wheel, frame valve
stem, and a view of other parts necessary to correctly locate valve gear.
Fig. 12 is a front elevation of fig. 11 with the yoke left out and with located
diameter of boiler, in partial outline, so as to more completely locate valve gear.
-J

page_text: Fig. 13 is a front elevation of rocker shaft, and
Fig. 14 is a rear elevation of fig. 13 with bell crank attached to rocker shaft.
Fig. 15 illustrates valve gear motion, obtained during the movement of main crank
pin from back dead centre point, through 135 deg. of its revolution, by 45 deg.
points.
Fig. 16 illustrates the valve movement as obtained by valve gear motion illustrated
by fig. 15.
The main driving axle 20, main driver 21, represented by dotted lines, frame 22,
cylinder 23, provided with supply ports 24 and 25 and exhaust port 26, cylinder
head 27, provided with stuffing box, piston 28, piston rod 29, cross head slides 30
and 31, slide valve 32, valve stem 33, truck wheel 34, represented by dotted lines,
yoke 35 and diameter outline of boiler 36, represented by full line in fig. 12, are all of
a common style of construction and arrangement, and are of the ordinary design.
The eccentric 37 is fastened to main driving axle 20, and is provided with the
eccentric straps 38, to which is fastened the eccentric rod 39. The link rocker
shaft 40 is mounted in bearing support 41, which is bolted to frame 22. The link
rocker shaft arm 42 is connected with eccentric rod 39 by means of pin 43. The
link 44, which is secured to link rocker shaft, is provided with the way 45, in which
.the link block 46 is free to slide in the usual manner of links of this class.
The reverse shaft 47, mounted in bearing of support 48, which is bolted to frame, is
provided with two arms 49 and 50. The arm 49 is connected by means of pin 51 to
reverse rod 52, which extends into the cab of the locomotive and is arranged and
adapted to operate in the usual manner. The arm 50 is connected to link block 46 by
means of pin 53, rod 54 and pin 55. The adjustable lead and cut off eccentric 56,
fastened to main driving axle 20, is provided with eccentric straps 57, to which is
secured the eccentric rod 58.
The rocker shaft 59 is mounted in bearing in support 60, which is bolted to frame,
and is provided with the armis 61 and 62. The radial slot 63, in arm 62, has fitted to
it the pin 64 which is free to slide, or is adjustable within the length of the slot, and
by means of which the eccentric rod is connected to and operates the rocker shaft.
The rocker shaft arm 61, which is strengthened by means of web 65, is provided
with the bearing in which is mounted the bell crank 66.
The arm 67 of bell crank is connected with valve stem 33 by means of pin 68. The
arm 69 of bell crank is connected with link block 46, by means of pin 70, rod 71 and
pin 55. To the pin 64 of the rocker shaft arm 62 is connected by means of rod 79
and pin 80 the arm 72 of the adjustable lead and cut off shaft 73, which is mounted
in bearing in support 74, which is bolted to frame. To the arm 75 is attached, by
means of pin 76, the adjustable lead and cut off rod 77 which extends into the cab of
the locomotive and is designed to be constructed and arranged to operate in a similar
manner to reverse rod mechanism.
The set of eccentrics is as follows:-
Illustrated in figure 10, main crank pin 78, represented by dotted sections.
The centre of link rocker shaft eccentric 37 is about 90 deg. back of main crank
pin 78, and the centre of lead and cut off eccentric is in the same radial line, or about
the same, as main crank pin 78. When the valve gear is in mid gear, the centre lines
of the following parts are in the following positions, or nearly so :-
Reverse shaft arms 49 and 50, rod 71, link rocker shaft arm 42, radial centre line
of link 44, bell crank arm 67, lead and cut off shaft arm 75 are vertical, or nearly so.
Reverse rod 52, rod 54, bell crank arm 69, and lead and cut off arm 77 are horizontal
or nearly so, and rocker shaft arms 61 and 62, and rod 79, are oblique from vertical
centre line through rocker shaft 59.
All the parts being made of the material and strength requisite for their respective
duties, and being suitably located and connected with the locomotive as shown in
drawings, and the bell crank arm 67 being correctly connected with the valve 32 and
throws of link rocker shaft eccentric and lead and cut off eccentric being correctly
proportioned, in order to give, by means of suitably constructed connecting parts, as

page_text: shown and described, the requisite throw of the slide valve, the operation of my device,
as illustrated by figures 15 and 16 is as follows:-
The main crank pin, link rocker shaft, eccentric and lead and cut off eccentric being
set as previously described, the throws of which are respectively designated by
circles 81, 82 and 83, and the movement of the crank pin and eccentrics
through 135 deg. by 45 deg. points being marked on said circles, as follows
respectively 1-2-3, 11-21-31- and 111 211_311 the valve gear motions at
different points, as shown, being marked respectively 11112111-3111, movements of
the valve 32 are illustrated by dotted lines 11-211_31111_.
The valve itself being shown in section in its position when the main crank pin and
eccentrics are set as previously described with main crank pin on back dead centre.
In operation many advantages are afforded by my device. By the placing of the
radial centre line of link at right angles or nearly so with centre line of adjustable
lead and cut off eccentric rod motion, I am able to operate the locomotive back or
ahead in quite nearly an equally efficient manner, and by means of the lead and cut off
device I am able to operate a locomotive in the most efficient manner, under different
speeds, having complete control of the amount of lead and cut off of the valve, and by
reason of the centre of eccentric 37 being placed one quarter back of centre of main
crank pin 78, the greatest speed of the eccentric motion is developed in the opening
and in the closing movements of the slide valve.
One of the greatest advantages is that while obtaining the control of the valve
motion as desired, the valve gear is extremely simple in its construction, very strong
and durable and has few parts.
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 correspondent I declare that what I claim is :-
1st. The eccentric 37 and lead and cut off eccentric 56 in combination with main
driving axle 20, substantially as described.
2nd. The eccentric 37, the centre of which is placed about one quarter back from
centre of lead and cut off eccentric 56 and centre of main crank pin 78, in combination
with main driving axle 20, and main driver 21, substantially as and for the purposes
set forth.
3rd. The eccentric 37, provided with straps 38 and rod 39, in combination with link
rocker shaft 40, provided with arm 42, and link 44, the centre radial line of which is
at right angles, or nearly so, with the centre line of eccentric rod 39, substantially as
described.
4th. The lead and cut off eccentric 56, provided with straps 57, and rod 58, in
combination with rocker shaft 59, provided with slot 63, substantially as described.
5th. The rocker shaft 59, provided with arms 61 and 62 the centre line of which
through said arms being at right angles or nearly so with centre line through rod 58,
substantially as described.
6th. The rocker shaft 59, in combination with bell crank 66, substantially as
described.
7th. The bell crank 66, provided with arm 67, the centre line of which is at right
angles, or nearly so, with axis of valve stem 33, and also provided with arm 69, the
centre line of which is at right angles, or nearly so, with centre radial line of link 44,
in combination with rocker shaft 59, substantially as described.
8th. The rocker shaft 59 in combination with adjustable lead and cut off shaft 73
and operative mechanism, substantially as described..
9th. The link rocker shaft 40, provided with arm 42 and link 44, in combination
with reverse shaft 47, and operative mechanism, substantially as described.
10th. The link rocker shaft 40, provided with arm 42 and link 44, and operative
mechanism, in combination with rod 71, which connects link to and operates bell
crank in the manner set forth.
11th. The link 44, operatively connected, the centre radial line of which is at right

page_text: angles, or nearly so, with the centre line of lead and cut off motion, as operatively
produced upon bell crank 66, in combination with bell crank 66, substantially as and
for the purposes set forth.
12th. The method of producing an adjustable lead and cut off valve motion by
placing the centre radial line of link at right angles, or nearly so, with centre line of
motion produced by adjustable lead and cut off eccentric, substantially as and for the
purposes set forth."
13th. The method of operating a single valve by the resultant motion of two kinds
of valve motions, one being of the lead and cut off type and the other being of the
main valve type, either of which may be operated independently of the other.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.