Improvements in Screw Down Taps
Year: 1893

page_text: Date of Application, 3rd May, 1893-Accepted, 2nd June, 1893
Improvements in Screw Down Taps,
I, JOHANN DOLLIEISER, of 21, Peterstrasse, Köln on the Rhein, in the Empire
of Germany, Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This invention relates to improvements in screw down taps, as shown in annexed
drawing, the screw spindle a being furnished with an elastic valve body b carried
by a head c formed on a spindle c¹ by means of which the elastic valve body b is
rendered rotary and longitudinally movable in the spindle a, in order that when
the elastic valve body b touches the rigid seat d on being screwed down, the
rotation of the body is interrupted and its vertical downward movement only
permitted by the continued turning of the spindle a.
By preference the valve body b forms a rotary body, the contact surface of
which is ball shaped or ball like, as shown for instance in the drawing.
The employment of the said valve body on the spindle a itself, so as to move in
a rotary as well as longitudinal sense, gives great durability and efficiency to the
tap and that specially when the rigid seat d in shape fits the contact surface of the
valve body.
By this construction of tap a leakage or loss of water is not only prevented, but
what is known as "the water hammer" is also entirely obviated, owing to the
elastic joint described cutting off the water by degrees.
It will be evident that this tap may not only be used in connection with water
conduits, but also for other fluids.
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 I
claim, is-
1st. A screw down tap in which is secured on or into the screw spindle an elastic
valve body which can be forced against an elastic or rigid seat, substantially as and
for the purpose specified.
2nd. A screw down tap, as specified in the preceding claim, in which the valve
body b and head c to which it is secured is rendered rotary movable on or in the
screw spindle a, whilst the valve body may also be longitudinally movable to the
said spindle, substantially as and for the purpose specified.
3rd. A screw down tap, as specified in Claim 1, in which the valve body forms
a rotary body, substantially as and for the purpose set forth.
4th. A screw down tap, as specified in Claim 1, in which the contact surface of
the valve body b is ball shaped or ball like, substantially as and for the purpose
set forth.
5th. A screw down tap, as specified in Claim 1, in which the rigid seat d is
formed to correspond with the elastic valve body b, i.e. its contact surface, substan-
tially as and for the purpose set forth.
6th. A screw down tap in which is arranged on or in the spindle a an elastic
valve body b and by means of its head c or spindle c¹ rendered rotary and
ultimately longitudinally movable, the valve body forming a rotary body, the
contact surface of which is ball shaped or ball like and the rigid tap seat d being

page_text: shaped to conform with that of the said valve body, substantially as and for the
purpose set forth.
Dated this 2nd day of May 1893.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.