Year: 1898

page_text: Date of Application, 27th Jan., 1898
1000
22nd Doo
1800
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Arents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
This invention relates to a tap or cock which, by closing automatically, prevents
a flow of liquid in excess of a given limit.
The object of my invention is to provide a cock in which this automatic closing
takes place with sufficient slowness to obviate the occurrence of any recoil, and in
which the speed of this closing may be varied or adjusted at will. The cock acts
equally well in a vertical or a horizontal position, and its parts are not subject
to wear, so that its life is almost indefinitely prolonged.
My invention consists essentially in providing a tap or cock in which the open-
ing of the closing part or valve allows the passage of a certain quantity of liquid
from one side of a flexible diaphragm to the other; whilst, when the outside
pressure that opens the cock is released, the closing thereof is dependent on the
passage of the said quantity of liquid in the reverse direction, which can only
take place through restricted passages whose area may be so proportioned at will
as to obtain the desired speed of closing.
According to one construction of my improved tap or cock, the flow of the
liquid is obtained by depressing a pusher rod or other equivalent actuating part,
thereby separating the main valve from its seat and allowing the liquid to pass.
In its descent, the valve stem, which is guided by wings, depresses the central
portion of a flexible diaphragm, the edges or periphery of which are secured to
the socket or casing, thereby diminishing the capacity of a chamber formed
beneath this diaphragm. The liquid in this chamber then overcomes the resist-
ance of a spring controlled valve, which on being raised permits the liquid to
pass above the diaphragm.
As soon as the pressure exerted from without upon the pusher rod ceases, a
spring tends to force the main valve upwards against its seat.
The valve governing the communication between the upper and lower sides of
the diaphragm again falls upon its seat, but the closing of the cock only becomes
complete when the liquid which has left the chamber below such diaphragm in
order to pass above the same has again descended beneath it. This return of the
liquid takes place through a space or spaces existing between the valve stem and
the tube or channel in which it works, and through a notch formed in the valve
seat. By suitably regulating the areas of these passages the duration of the period
which the cock occupies in closing may be modified at will.
In a modification of my invention the diaphragm valve is replaced by a pin
fixed to the socket or casing below the diaphragm, and working in the tubular

page_text: stem or extension of the main valve. The passage of the liquid from the chamber
beneath the diaphragm to the space above the same, and vice versa, takes place
through holes formed in the said tubular stem or extension. Additional holes
may be formed in the diaphragm itself, which, when the cock is opened, that
is to say, when the liquid is passing above the diaphragm, permit some of the
liquid to pass through them, but are closed by suitable means when the diaphragm
is no longer depressed.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, 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:-
-
This invention relates to a tap or cock which closes automatically and in which
violent shocks are prevented.
The object of my invention is to provide a cock in which this automatic closing
takes place with sufficient slowness to obviate the occurrence of any recoil and
in which the speed of the closing may be varied or adjusted at will. The cock
acts equally well in a vertical or a horizontal position; and its parts are not
subject to wear, so that its life is almost indefinitely prolonged.
My improved tap or cock is illustrated in the accompanying drawing in which;
Figure 1 is a central vertical section of the cock in which the valve is shewn
in external elevation.
Figure 2 is a vertical section of the valve drawn to an enlarged scale.
Figure 3 is a horizontal section upon the line X Y of Figure 1.
Figures 4 and 5 are horizontal sections upon the lines U Z, and V W respectively,
of Figure 2.
Figure 6 is an elevation of a modified form of valve.
Figure 7 is a central vertical section of a modified form of my tap or cock.
Figure 8 is a section of the valve shown in Figure 7 and
Figure 9 is a horizontal section on the line X Y of Figure 7.
According to the construction of my improved tap or cock shown in Figures 1
to 5 the flow of the liquid is obtained by depressing the knob or button push rod
or other equivalent device A, thereby separating the main valve a from its seat b
and allowing the liquid from B to pass. In its descent, the valve a which is
guided by wings.c, depresses the central portion of a flexible diaphragm d, the
edges or periphery of which are secured to the casing thereby diminishing the
capacity of the chamber C formed beneath this diaphragm. The liquid in this
chamber then overcomes the resistance of the valve f controlled by spring e and
permits the liquid to pass above the diaphragm d.
As soon as the pressure exerted from without upon the button or knob A ceases,
the main valve a is forced upwards against its seat by the spring i.
The valve governing the communication between the upper and lower sides
of the diaphragm again falls upon its seat, but the closing of the cock only
becomes complete when the liquid which has left the chamber C below such dia-

page_text: phragm in order to pass above the same, has again descended beneath it. This
return of the liquid takes place through the spaces g, y existing between the valve
stem and the tube or channel in which it works (Figure 4) and through a notch h
formed in the valve seat (Figure 5). By suitably regulating the areas of these
passages the duration of the period which the cock occupies in closing may be
modified at will.
Figure 6 shews a modification of the valve f in which the interstices g aro
replaced by a helicoidal groove g¹g'.
In the modifications of my invention shewn in Figures 7, 8 and 9 (correspond-
ing to Figures 1, 2 and 3 respectively) the valve f is replaced by a pin f¹ fixed to
the socket or casing below the diaphragm and working in the tubular stem or
extension of the main valve. The passage of the liquid from the chamber C to
the space above the same and vice versa, takes place through the holes / formed
in the said tubular stem or extension of the valve a. Additional holes ¹ may be
formed in the diaphragm itself, which, when the cock is opened, that is to say
when the liquid is passing above the diaphragm, permit some of the liquid to
pass through them but are closed by suitable means when the diaphragm is no
longer depressed.
Having now particularly described and ascertained the nature of the said in-
vention 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 :-
A tap or cock in which violent shocks are prevented, characterised by the fact
that upon the opening of the closing part or valve, a pre-determined quantity of
liquid is allowed to pass from one side to the other of an elastic diaphragm which
divides the interior of the casing of the cock into two compartments or chambers,
whilst upon closing the cock the return of the liquid which has passed through
is permitted to take place through very small openings only, the cross-section of
which may be adapted to the desired speed of closing.
0711
£tala1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.