Improved Variable Cut-off Gear or Apparatus for Fluid Pressure Engines.
Year: 1887

page_text: Date of Application, 10th Mar., 1887
Complete Left, 9th Dec., 1887
Complete Accepted, 13th Jan., 1888
Improved Variable Cut-off Gear or Apparatus for Fluid Pressure
Engines.
ANDREW HENRY CHARTRES of 111 Parliament Street Derby in the county of
Derby Engineer do hereby declare the nature of this invention to be as follows :-
My invention has for its object the construction and arrangement of an improved
variable cut off gear or apparatus for engines worked by fluid pressure.
I will describe my invention as applied to a steam-engine, whereby I am enabled to
regulate the cut off and expansion of the steam with great accuracy and so economise
fuel and also to quickly stop the engine in case of emergency.
་་
Iarrange a slide or other suitable valve for admitting steam to the cylinder and in
the steam chest in which the valve works I form any desired number of ports or
orifices. For the sake of description I will hereafter designate the part of the steam
chest having such ports or orifices as the fixed pori-plate." I surface the outside of
this fixed port-plate for a moveable port-plate to work upon such fixed port-plate
having a number of orifices or ports formed through the same corresponding to the
number of ports or orifices in the fixed port-plate.
Working on the other face of the moveable port-plate is another plate having ports
or orifices formed through the same and in number corresponding to the ports or
orifices in the fixed port-plate and the moveable port-plate and which for the sake of
description I will designate the valve-plate.
Both the moveable port-plate and the valve-plate work in a separate steam-chest in
communication with the usual steam-chest in which the slide or like valve works by
reason of the ports or orifices in the fixed port-plate.
The slide valve of the engine is worked from the main shaft or otherwise by any
suitable motion, and the valve-plate is likewise worked but at a different speed to the
slide valve say for instance making double the number of strokes to those of the slide-
valve.
The moveable port-plate I work from the governor so as to travel (when worked by
the governor) intermittently over the ports or orifices in the fixed port-plate and those
Aihe valva ulats

page_text: I advantageously do this as follows
I arrange a rod to work through a stuffing-box in the supplementary steam-chest
aforesaid and carrying the moveable pori-plate. Outside the steam-chest and on this
rod fit an adjustable collar or siop between which and a fixed boss or bracket
a suitable spring is compressed. This spring may be advantageously of the spiral
order.
Outside the boss or bracket. I form an inclined slot or recess in which I arrange to
work a wedge or inclined plane connected by a link or other motion with the governor.
I arrange a hand nut or wheel or other suitable device adjusting a collar or stop io or
In working
from the wedge or inclined plane so as to check is to and fro motion.
the engine the slide or like valve is moved from the motor shaft. as usual, its valve
chamber being always full of steam admitted by the moveable port-plate and the
valve-plate the ports of which control the passage of steam to the steam-chest through
the ports of the fixed pori-plate.
The hand nut or wheel on the spindle of the sliding rod working the moveable
port-plate adjusts the play of the sliding wedge or inclined plane in the said sliding rod
working the moveable port-plate and so regulating its throw.
The slide or like valve has a positive motion from the engine and the valve-plate a
corresponding motion but in increased ratio.
Any racing in the engine will act on the governor which will move the moveable
port-plate over the ports in the fixed port-plate and the valve-plate and so partly or
wholly cut off the steam-supply to the main valve-chest and the previous adjustment
of the said hand wheel or nut regulating the wedge or inclined plane determines the
amount of cut-off and expansion to be allowed.
1 may vary the details for operating and adjusting the travel of the moveable
port-plate and generally the other details of my invention as may be desired or
required by its adoption for engines worked by fluid pressure being other than steam-
engines.
By actuating the moveable port-plate independently of the governor such as by a
hand-lever, chain or other device or by hand directly, I can cause it to shut off the
steam entrance to the main valve-chest and check the speed of the engine or
stop it.
Dated this 10th day of March 1887
POPPLEWELL, COLTON & Co.,
Agents for the Applicant.

page_text: QUALETE SPECIFICATION.
Improved Variable Cut-off Gear or Apparatus for Fluid Pressure
Engines.
ANDREW HENRY CHARTRES of 111 Parliament Strect Derby in the county of
Derby, 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:-
My invention has for its object the construction and arrangement of an improved
variable cut off gear or apparatus for engines worked by fluid pressure.
am enabled
I will describe my invention as applied to a steam engine whereby
io regulate the cut off and expansion of the steam with great accuracy and economise
fuel and also to quickly stop the engine in case of emergency.
Referring to the accompanying drawings and to the Figures and letters of reference
marked thereon.
Figure 1. is a horizontal section through the parts composing my invention the
other parts of the engine and the devices for actuating the valves being omitted.
Figure 2 is a sectional elevation on line a-a Figure 1.
1 arrange a slide or other suitable valve (not shewn) for admitting steam to the
cylinder and in the steam chest A in which the valve works I form any number of ports
or orifices as at B.
For the sake of ready description I will hereafter designate the part of the steam
chest having such ports or orifices as the "fixed pori, plate." I surface the outside of
this fixed port plate" for a "moveable port plate "C to work upon such fixed
pori. plate and having a number of orifices or poris formed through the same
corresponding to the number of ports or orifices in the " fixed port plate. Working
on the other or outer face of the moveable port plate" is another plate D having
ports or orifices such as E formed through the same and corresponding to the ports
or orifices in the "fixed port plate" and the "moveable port plate" and which for
the sake of description 1 will call the "valve plate."
Both the moveable port plate" and the valve plate" D) work in a separate
steam chest. A' in communication with the usual steam chest A in which the slide or
like valve (not shown) works by reason of the ports or orifices B in the
plate."
::
fixed port
The slide valve of the engine is worked from the main shaft or otherwise by any
suitable motion and the valve plate D is likewise worked but at a different speed to the
slide valve say for instance making double the number of strokes to those of the
slide valve.
::
The moveable port plate" C1 work from the governor so as to travel when
so worked by the governor intermittently over the ports or orifices B in the fixed
port plate" and those in the valve plate." I advantageously do this by arranging a
rod F to work through a stuffing box G in the supplementary steam chesi E aforesaid.
Outside the steam chest A¹ and on this rod FT fit an adjustable collar or stop H
between which and a boss or bracket a suitable spring J is compressed this spring
may be as shewn of the spiral variety. Outside the boss or bracket 1, 1 form a

page_text: bevelled surface on which I arrange to work a wedge or inclined plane K connected
by a lever or other motion with the governor.
1 arrange a hand-nut or wheel 1, or other suitable device for adjusting a collar or
stop M to or from the wedge or inclined plane K so as to check its to and fro motion.
On working the engine the slide or like valve is moved from the motor shaft, as usual
its valve chamber being always full of steam admitted by the "moveable port plate
and the valve plate the ports of which control the passage of steam to the steam
chest A through the poris of the fixed port plate."
"
The hand-nut or wheel L on the spindle of the sliding rod F working the "moveable
port plate“ C adjusts the play of the sliding wedge or inclined plane K on the said
sliding rod Fworking the moveable port plate C and so regulating its throw.
"
The slide or like valve has a positive motion from the engine and the valve plate D
a corresponding motion but in increased ratio.
The cam working the valve is shewn in my Letters l'aieni 11991 of 1887.
moveable
Any racing in the engine will act on the governor which will move the
port, plate over the ports in the fixed port plate" and the valve plate" and so
partly or wholly cut off the steam supply to the main valve chest and the previous
adjustment of the said hand wheel or nut L regulating the wedge or inclined plane K
determines the amount of cut off and expansion to be allowed.
::
or
I may vary the details for operating and adjusting the travel of the moveable port
plate and generally the other details of my invention as may be desired
required by its adoption to engines worked by fluid pressure being other than steam
engines.
If desired I can form a rack on the stem of the moveable port plate" and work it
by a toothed quadrant actuated from the engine governor in this case no check spring
is required. By actuating the moveable port plate" C independently of the governor
such as by a hand lever lever, chain or other device or by hand directly, I can cause
it to shut off the steam entrance to the main valve chest and check the speed of the
engine or stop it.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to he performed declare that what I
claim is
1. The improvements in variable or cut off gear for fluid pressure engines substan-
tially as described and illustrated by the accompanying drawings.
2. In steam or like fluid pressure engines, in combination with a supplementary
valve chest having ports communicating with the main valve chest in which the slide
or like valve works, a sliding grid or perforated valve plate travelling at a faster speed
than the main slide or other valve and given a positive motion from the engine or its
shaft and a moveable port plate or perforated grid travelling on the aforesaid grid or
perforated valve plate" and worked from the governor of the engine whereby the
said governor effects the cut off by moving the moveable port plate "between the
"valve plate" and "fixed port plate" in the steam chest. substantially as described.
3. The method of adjusting the cui off of the "moveable port plate by means of a
link connected to the governor having an inclined plane fitting a rod or spindle such
as F confined by a sei collar a spring and an adjustable collar or hand wheel substan-
ially as described.
1
1007
POPPLEWELL, COLTON & Co..
17 & 18, Southampton Buildings,
Agents for the Applicant.