Improvements in Taps.
Year: 1888

page_text: Date of Application, 9th Nov., 1888
Complete Specification Left, 1st Aug., 1889-Accepted, 7th Sept.. 1889
PROVISIONAL SPECIFICATION.
Improvements in Taps.
I, GEORGE CULVER, of 143, London Road, Dover, in the county of Kent, Engineer,
do hereby declare the nature of this invention to be as follows :—
This invention relates to improvements in what are known as
diaphragm taps.
screw down
In this class of tap as hitherto constructed it has been found that the taps soon get
out of order in consequence of the thread of the screw becoming worn which wear
of the screw thread arises from the fact that when the tap is closed and subjected to
the greatest pressure such pressure has to be sustained by a small portion of the
screw only.
My invention has for object to obviate these defects.
For this purpose I employ a longer screw than usual and use a fixed nut which
enables me to carry the screwed spindle right through the nut, the said spindle being
operated by a handle instead of the handle operating the nut as hitherto. The said
handle is provided with a cap adapted to fit over the outside of the nut and enclose
the projecting part of the screwed spindle so as to protect it from dirt.
on the
The other parts of the tap are of the usual construction except that the plate
end of the screwed spindle which presses against the diaphragin is loose and bears or
works against a boss or collar on the screwed spindle.
By these improvements it will be obvious that at all positions of the screwed spindle
the nut is always full of the screw thread.
Dated the 9th day of November 1888.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Taps.
I, GEORGE CULVER, of 143, London Road, Dover, in the county of Kent, 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 improvements in what are known as screw-down
diaphragm-taps.
Taps of this class, as hitherto constructed, soon get out of order in consequence of
the thread of the screw becoming worn, which wear of the screw-thread arises from the
fact that, when the tap is closed and subjected to the greatest pressure, such pressure
has to be sustained by a small portion of the screw only.
My invention has for object to obviate these defects, and to this end it comprises
the improvements hereinafter described.
In the accompanying drawing,
Figure 1 is an elevation, and,
Figure 2 a section of a tap constructed according to my invention.
Similar letters in both the figures indicate similar parts.
In carrying out my invention I employ a longer screw a than usual, and I use a
fixod nut b cast on the dome or cap which is fixed to the body a¹ of the tap by
screws 6, 6 in the usual manner and holds the diaphragm f. This fixed nut baffords
a long bearing surface for the screwed spindle a, the said spindle being operated by
a handle c, instead of the handle operating the nut, as bitherto. The handle o is

page_text: provided with a cap d adapted to fit and move over the outside of the nut 6 and
enclose the projecting part of the screwed spindle a so as to protect it from dirt
and serve as a guide to ensure the spindle moving. vertically.
The other parts of the tap are of the usual construction. except that the plate e which
is on the end of the screw threaded spindle a and which presses against the
diaphragm fis loose on the spindle a and is provided with arms 9, 9 which run in
guides h, cast on the dome or cap i so that the plate e cannot turn. The said plate
bears or works against a boss or collar; on the screwed spindle a.
By these improvements it will be obvious that at all positions of the screwed spindle a
the nut is always full of the screw-thread, and that the cap d and upper portion of
the dome being arranged telescopically the accurate screwing down of the spindle a
and valve-plate e upon the diaphragm or washer fand valve seat in the body a¹ of the
cock is insured thus allowing a longer life to the india rubber than heretofore.
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) A screw-down diaphragm-tap having a handle provided with a cap fitting over
a fixed nut in which the screw-threaded spindle of the tap works, substantially as, and
for the purpose, herein before described.
(2) In a screw-down diaphragm-tap, arranging the plate which presses the
diaphragm onto its seat loose on the screw-threaded spindle and providing it with
guides to prevent it from turning with the spindle, substantially as hereinbefore
described.
(3) The improved tap hereinbefore described and illustrated in the accompanying
drawing.
Dated the 1st day of August 1889.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.