Improvements in Screw-down Cocks or Taps.
Year: 1890

page_text: Date of Application, 18th Nov., 1890-Accepted, 20th Dec., 1890
COMPLETE SPECIFICATION.
Improvements in Screw-down Cocks or Taps.
I, CHARLES HUELSER of the firm of Huelser & Co. of Temple Chambers London,
International Patent Agency, do hereby declare the nature of this invention, a
communication to me from abroad by Wilhelm Krüger of 44ª Holzmarktstrasse
Berlin in the Empire of Germany Manufacturer, 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 screw-down cocks or taps and has for its purpose to remove
the drawback inherent to the screw-down cocks with india rubber plate packing
hitherto known, in which the latter is screwed down thereby effecting the closing of
the inlet and simultaneously the packing-of the upper portion of the cock or tap.
Said drawback consists in the liability of such cocks or taps to become soon untight
by excessive tightening of the screw. When however the pressure exerted by the
screw, which is guided in the upper portion of the cock-is not strong, the inlet is
frequently insufficiently closed, which results in the water-wasting, dripping as occurs
for instance with kitchen taps.
The excessive tightening of the screw, which is prejudicial to the indiarubber plate,
is therefore by no means always matter of irrational use, but is in most instances
necessitated by the faulty construction of the cock or tap.
The novel and peculiar construction forming the subject of this application is based
on the idea of retaining the known indiarubber plate and its nsual operation and
combining therewith a valve showing the advantages, but not the inconveniences of
the indiarubber plate.
Reference being had to the accompanying drawing,
Figs. 1 and 2 are vertical longitudinal sections of the improved device in two different
working positions.
Fig. 3 represents the cock or tap in top view, the upper portion being omitted.
The cock is illustrated as executed on a small scale, so that it can serve not only as
a water cock, but also as an air cock. In this small execution the formation of the
upper part A of the cock as cap nut for the lower portion E is admissible, as, when
the two portions are being screwed together, the indiarubber plate C placed between
the same can still be compressed with sufficient energy to form a tight closing of the
upper portion.
In order to obviate any tearing of the indiarubber plate C during the screwing-
on of the top portion A, a metal intermediate ring d is placed on the indiarubber
plate. A small cylinder is firmly and hermetically screwed on the top side of the
indiarubber plate by means of screw a, the pressing screw c engaging into said
cylinder. The head of screw a is counter-sunk or hollowed and a small caoutchouc
plate D is placed into the cavity thus formed. On the indiarubber plate C being
screwed down, the said caoutchouc plate closes the inlet aperture in the cock or tap
and also the screw pressure is considerably increased, while at the same time the
caoutchouc D offers such a resistance to injury as to render it impossible to destroy
the plate D with direct manual action on the key E.
The plate a however still retains such a degree of elasticity as not to receive any
rends or cuts, which would-as with metal valves-prevent further tightening.
Any slight cavity the caoutchouc plate may have received by a sand-or other
small particle, would be transitory, it being compensated, with the next screwing down,
by the contiguous material, without the plate D' becoming rent or crannied.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :
In screw-down cocks or taps with membrane packing (C), the application of a
second resistant tightening plate (D) in combination with such packing for the purpose
of obviating destruction of the packing material by the tightening of the screw,
substantially as set forth.
Dated th
HUELSER & Co.,
Temple Chambers, London, Agents for Applicant.