A New or Improved Stop-cock or Valve and Pilot Light Fitting, applicable to Gas Fires and Gas Cooking Appliances.
Year: 1896

page_text: Date of Application, 3rd Feb., 1898-Accepted, 7th Mar., 1896
COMPLETE SPECIFICATION.
A New or Improved Stop-cock or Valve and Pilot Light Fitting,
applicable to Gas Fires and Gas Cooking Appliances.
I, WILLIAM MCCAIG, of 665 Cathcart Road, Govanhill, Glasgow North
Britain, Gas Engineer, do hereby declare the nature of this iuvention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
This invention which relates to a new or improved stop cock or valve and
pilot light fitting applicable to gas fires and gas cooking appliances, consists in
constructing the plug of such stop cock or valve with a three way port or
passage.
The gas passing through the inlet port is conducted to either the pilot light
port or the port or passage leading to the supply pipe of the gas fire or cooking
appliance and is so arranged, as hereinafter more fully described, that only one of
such ports can be open at a time. By virtue of an adjustable stop arrangement
the opening of one of the before mentioned ports and the communication of the gas
to either the pilot light, fire or cooking appliance aforesaid is efficiently determined
while the gas cannot possibly be wholly turned off unless by the will of the
attendant and by a simple operation of raising or pressing the said adjustable stop.
In order that my invention may be properly understood and readily carried into
effect, I have hereunto appended an explanatory sheet of drawings in the several
figures of which corresponding parts are marked by the same letters of
reference.
Figure 1, is a side elevation of a stop cock or valve made in accordance with
and constituting my invention.
Figures 2, and 3, are cross section and horizontal section respectively of
the same.
Figures 4, and 5, are part sectional views respectively illustrating the plug of
the valve in two different positions as hereinafter more fully referred to.
Figure 6, illustrates in plan an application of the stop cock or valve and pilot
light fitting to a cooking appliance, an ordinary grill for example.
Figures 7, and 8, are side elevation and end view respectively of a portion of a
valve showing a modification of the adjustable stop arrangement.
A, is the stop cock or valve. B, is the plug with the port or passage C,
which as shown in Figs. 2. and 3. is open and the gas is free to pass through
port D, to the pilot branch E. Figure 6, shows the valve A, in this position
and the gas burning from the jet of the pilot extension F, in close proximity
to the jets of the grill G. H, is the port by which the gas is led to the gas
fire or cooking appliance. By turning the key or crosshead I, a quarter turn
(which is the limit of its travel), that is to say, when the central position of the
said adjustable stop J, is moved till it is at right angles to the position it occupied
in Figs. 2, 3, and 6, the plug B, will, (the adjustable stop J, engaging) be in the
position shewn in Figure 4. and the gas will have a clear passage as seen in the
figure, to pass to the Bunsen burners of the gas fire or cooking appliance.
The adjustable stop J, is provided with an indent or groove j, to facilitate
its being raised out of the locked position shewn in Figs. 1, 2, and 6 by the
thumb nail. When so raised and released by the nail it drops by its own weight
into its former position.
To. guide it in its up and down travel a cross pin or rivet i. is provided which

page_text: works in a vertical slot i, formed centrally in the head of the key I, and connects
it to the back portion J. The adjustable stop J. is inserted between the jaws of
a deep cut or groove formed in the neck of the plug B, to prevent it from any
lateral motion, when it comes against the stop a, of the valve A, to lock the
plug B. in its position shewn in Figure 4.
To prevent any gas whatever from passing through the valve. the adjustable
stop J, is raised by means aforesaid until the lower end of the extension J2, is
lifted clear of the said stop a, this being done the plug is free to be turned the
remaining quarter turn to bring it in the position shewn in Figure 5, and when in
this position the adjustable stop drops into a slot m, cut in the barrel whereby it
can be locked from moving either way.
Under a modification illustrated in Figs. 7 and 8, the bolt J, by means of a
flat or plate spring K, locks the plug C, and thereby ensures the gas being directed
to either the pilot light For gas cooking appliance G. The upper end of the
said bolt J terminates in a button or thumb-piece L which when the gas is required
to be wholly turned off greatly facilitates the attendant resisting the action of the
spring K, and releasing the bolt J. from the locked position as already described.
It will be seen that the position of the plug B, (Figs. 1, 2, 3, 4, 6, 7 and 8,) is
determined by the stud b, as ordinarily employed in valves of this type engaging
the shoulder or stop a', of the valve or cock A on the one side and the bolt J
coming against the stop or shoulder a, on the other.
I am aware that pilot lights have already been in use with gas fires and
cooking appliances. The application, however, has invariably been made by the
employment of a separate stop cock or valve for both the pilot light and the
inlet pipe leading to the gas fire or cooking appliance.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :
1. The method of constructing the stop cock or valve of a gas fire and gas
cooking appliance to which a pilot light is connected in such manner that the gas
is made to pass through a port in the plug of the stop cock or valve leading
either to the pilot light or the inlet pipe of a gas fire or cooking appliance
substantially in the manner and for the purposes hereinbefore described and
shown in the drawings.
2. The adjustable stop arrangement for limiting the plug of a stop cock or
valve being turned to admit the flow of gas through two ports only at one time of
a three-way stop cock or valve and the means therein of releasing the said plug
to enable the gas to be entirely turned off.
Dated this 31st day of January 1896.
WM. McCAIG,
665 Cathcart Road, Govanhall, Glasgow, Applicant.