Improvements in Stop Cocks.
Year: 1894

page_text: Date of Application, 5th July, 1894
Complete Specification Left, 4th Apr., 1895-Accepted, 4th May, 1895
Improvements in Stop Cocks.
I, JAMES CONSTANT MCNABB, of No. 114 Grand Trunk Street, in the City
of Montreal, in the District of Montreal, and Province of Quebec, Dominion of
Canada, Engineer, do hereby declare the nature of this invention to be as
follows:-
-:
This invention relates to stop cocks applicable to railway air brake systems and
more particularly the angle cocks thereof, the object being to provide means which
will prevent any tampering with the cocks that could have serious consequences
or, as it might be otherwise expressed, to nullify the evil effects of any interference
therewith as by closing the valve of an angle cock and thereby cutting off the
drivers control of the brakes.
The invention may be said to consist in the construction of a stop cock with a
locking device or movable parts to prevent the movement of the valve of the
cock, the unlocking of which device will effect the escape of the air, or other
operative medium, and consequent application of the brakes so that all danger is
averted by the interference being made known.
0
I prefer to make the locking device or moveable part in the form of a plug
working through an opening in the cock casing constructed with such an opening
and adapted, upon movement in one direction, to engage and hold against
movement the valve proper constructed to receive it and by movement in the
direction required to release the valve proper, securing the escape of said fluid.
before such valve is released.
Dated this 5th day of July 1894
ABEL & IMRAY,
Agents for the Applicant.
improvements in Stop
I, JAMES CONSTANT MCNABB, of No. 114 Grand Trunk Street, in the City
of Montreal, in the District of Montreal, and Province of Quebec, Dominion of
Canada, 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 stop cocks applicable to railway air brake systems and
more particularly the angle cocks thereof, the object being to provide means
which will prevent any tampering with the cocks that could have serious
consequences or, as it might be otherwise expressed, to nullify the evil effects of
any interference therewith as by closing the valve of an angle cock and thereby
cutting off the driver's control of the brakes.
The invention may be said to consist in the construction of a stop cock with a
locking device or movable parts to prevent the movement of the valve of the cock,
the unlocking of which device will effect the escape of the air, or other operative
IP Ad

page_text: medium, and consequent application of the brakes so that all danger is averted by
the interference being made known.
Fig. 1 of the accompanying drawings is a side elevation partly broken away of
an angle cock with rotatable valve to which my locking device is applied and
Fig. 2 an enlarged horizontal section of the same, also partly broken away.
I show my invention applied to this form of stop cock as its efficacy is best
illustrated by the application of it, but it is equally applicable to all cocks for
similar purposes.
A is the outer casing of the angle cock such as that of the Westinghouse air
brake system, B its usual tapered valve or plug with supporting spring Cand
handle c, and D is the usual recessed nut cap holding the spring and valve in
place.
According to my invention a lateral screw threaded hole is made through the
side of the casing A and valve B and in these holes is placed the locking device
preferably in the form of a plug F with nut head and three channels g along it
to within such a distance of the head as will leave an intact portion h sufficient to
secure a thoroughly air tight joint when the plug F is screwed in to prevent
movement of the valve B.
Before the valve can be moved the plug F must be withdrawn from it as
indicated in dotted lines and the channels 9 are of such length that before the end
of the plug leaves the valve air can pass through the three channels g` thus
preventing any, ill consequences that might arise from the valve being closed
without the driver's knowledge.
Having now particularly described the nature of this invention and in what
manner the same is to be performed, I declare that what I claim is :-
°
1. In a stop cock, a moveable locking which in one position, locks the valve
against movement and in another position, when it unlocks the valve allows
passage for the fluid controlled by the valve substantially as described.
2. In combination with the plug of a stop cock controlling the passage of a
fluid a movable locking device in the form of a screw plug channelled for a
portion of its length, and adapted when screwed in to enter a hole in the plug so
as to hold it against movement, and when screwed out to allow passage of the
fluid through its channels before freeing the plug substantially as and for the
purpose set forth.
Dated this 4th day of April 1895
ABEL & IMRAY,
Agents for the Applicant.