Improvements in Cocks or Traps.
Year: 1893

page_text: Date of Application, 24th May, 1893
Complete Specification Left, 23rd Feb., 1894-Accepted, 14th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in Cocks or Traps.
I, FRANCIS BRISTOW RAWES, of 2, Fern Villas, Norman Street, Leytonstone,
in the County of Essex, Gentleman, do hereby declare the nature of this invention
to be as follows:-
My invention relates to cocks or taps of the kind having conical or similar plugs
and the object of my invention is to provide means for lifting the plug of a cock or
tap from its seat when operating the same to open it and thereby reducing friction
and diminishing wear and tear.
In carrying out my invention I provide some part of the plug or of a stem,
connected with the plug, with screw threads or their equivalents and upon the shell
of the cock or a part adapted to be fixed to the shell I form other screw threads
with which the screw threads in connection with the plug engage, in such a manner
that when the plug is turned it will be moved longitudinally.
Around the shank of the plug I place a ring which fits into the shell of the cock
or tap so as to leave a space between its under side and the top of the plug to allow
of the longitudinal movement of the latter. A corresponding space is left at the
lower end of the plug which space is connected by a passage with the passage
through the cock so as to allow the escape of liquid therefrom as the plug is moved
downwards when closing it.
Above the ring herein before referred to I arrange a stuffing box suitably closed
such as by a cap or gland.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Cocks or Traps.
I, FRANCIS BRISTOW RAWES, of 2, Fern Villas, Norman Street, Leytonstone,
in the County of Essex, Gentleman, 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 cocks or taps of the kind having conical or similar plugs
and provided with means for lifting such plugs from their seats when operating the
same to open them, in order to their being more easily manipulated and to reduce
friction and diminish wear and tear.
In carrying out my invention I provide some part of the plug preferably at the
upper part thereof or of a stem connected with the plug, with screw-threads or their
equivalents and upon the shell of the cock or a part adapted to be fixed to the shell
I form other screw-threads with which the screw-threads in connection with the
plug engage, in such a manner that when the plug is turned it will be moved
longitudinally.
Around the shank of the plug I place a ring which fits into the shell of the cock
or tap so as to leave a space between its under side and the top of the plug to allow
of the longitudinal movement of the latter. A corresponding space is left at the
lower end of the plug, between it and the closed bottom of the shell which space is

page_text: connected by a passage with the passage through the cock so as to allow the escape
of the coutents therefrom as the plug is moved downwards when closing it.
Above the ring herein before referred to I arrange a stuffing-box suitably closed
such as by a cap or gland.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing which shows in longitudinal section a cock
or tap having my improvements applied thereto.
C
a is the shell of the cock, and is the plug, the said plug having at its upper
part screw-threads c which enter corresponding threads d formed in the shell of the
cock of which said threads the portion above the closed cock is shown in the
drawing so that, when the cock is turned to open it, it will be lifted from its seat a
distance corresponding to the pitch of the thread and the extent to which the plug
is turned.
e is the ring or plate surrounding the shank and serving to support the packing
of the cock so as to allow of the longitudinal movement of the plug without contact
of the plug with the packing. f is the space between the lower end of the plug
and the bottom of the shell. g is a passage which I form between the space f and
the passage through the cock, preferably at the discharge side of the cock, the said
passage serving when the plug is turned to close the cock to allow any fluid which
may have entered the space beneath the plug to escape sufficiently to obviate any
pressure on the bottom of the plug which might interfere with or prevent the proper
seating of the latter.
In case it is required that the channel or perforation through the plug be made
before the fitting of the plug into the shell instead of forming the screw or thread
in the shell, I recess the upper part thereof and provide a ring to fit such recess the
said ring being internally screw-threaded to fit the plug whereby the said plug may
be adjusted relative to the position of the channel through the plug and the ring
secured in its proper place such as by set screws passed through the shell and
pressing against it.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In cocks or taps of the kind hereinbefore described the arrangement of a
passage, such as g, connecting the space beneath the plug and between it and the
closed bottom with the passage through the cock preferably at the discharge outlet,
substantially as described.
2. The manufacture and use of the improved cock or tap hereinbefore described
and illustrated in the accompanying drawing.
Dated the 23rd day of February 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.