Improvements in Cocks for Bath and other Purposes.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Cocks for Bath and other Purposes.
I, EDWARD BLUHM, of Ritterstrasse 12, Berlin, in the Empire of Germany,
Manager of Factory, 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 for improvements in cocks for bath and other purposes has for its
object to construct a cock for mixing fluids of different kinds and of different
temperatures for various purposes. For bath purposes it is so arranged that when
opened, cold and hot water do not at first flow together into the mixing chamber of
the cock but first a certain quantity of cold water flows in and with an increased
opening the hot water flows, mixed with the former and reaches the bath or spray
in the mixed state. By this arrangement hot water alone can never reach the bath
or spray and consequently the bather cannot be scalded.
For other purposes a
simultaneous opening of the inlets can be effected.
In the accompanying sheet of illustrative drawings
Fig. 1 shows in vertical section a mixing cock for baths constructed according to
this invention, and
Figs. 2 and 3 are horizontal sections of the same shewing different positions of
the inlet valves.
These
Inside the body a of the cock, which is closed and made tight at the top in a
suitable manner is the spindle b fitted so that it can be rotated axially and operated
by means of a handle 62 fixed to the upper end 6 the motion being limited by the
pin stop c. The spindle b is provided at the lower end with the specially shaped
cam pieces d and d¹ fixed in suitable position with respect to each other.
serve for opening the valves e and e¹ for the cold and hot water inlets. The
valves e and e' are simple disc conical metal valves which when the mixing cock is
closed are kept shut by the pressure of the supply as well as by the safety
springs g and g'.
The cams d and d' are not fitted diametrically opposite to each other but are so
arranged that on turning the spindle first the cold water spindle e is pushed away
from its seat; when a certain quantity of cold water has entered, the cam d¹ comes
into contact with its valve e¹ opens this and allows the hot water to flow from the
supply pipe which then mixes with the cold water and so arrives at the jet or
spray. This arrangement of the valve openers d d prevents as previously
mentioned the flow of hot water alone and makes it impossible for the bather to be
scalded. The outer periphery of the cam pieces dd' is crescent shaped and curves
back to the spindle on the side opposed to the corresponding valve. The other
side can be formed as desired; the curve of the cam d is sharper than that of the
cam d so that on the opening of the cock cold water can flow more quickly, that is,
in larger quantities, than hot water. The figures of the drawing show the various
positions of the cams and valves during the opening of the mixing cock, that is;
during the quarter turn of the spindle 6 in Fig. 1 both valves e and e¹ are shut.
In Fig. 2 e is slightly opened, e¹ being still quite closed. In Fig. 3 both valves
are open. On the reverse movement of the spindle b with the cams d d¹ the hot
water valve e' is closed before the cold water valve e so that here also scalding is
prevented. It is reserved to modify as required the eccentric parts d d of the
spindle b.
The following apparatus is also brought into use with the above described mixing
cock.
It consists in the arrangement of a passage i made in the outlet union h and
which leads from the cold water pipe to the mixing chamber, opening therein by a

page_text: kind of nozzle. The cold water can only reach the mixing chamber through this
passage and as it flows generally under greater pressure than the hot water the
latter is drawn as by an injector and an intimate mixing of the two thereby takes
place. This arrangement also prevents the entry of the cold water flowing at a
greater pressure into the hot water pipe and reservoir.
Furthermore the mixing cock provided with the passage i before described
possesses the advantage that not only can it be used for supplies of cold and hot
water but also with cold water and steam. In this case the steam which is under
the greatest pressure is led through the passage i so that the valve e has to regulate
the steam supply and the valve e¹ the cold water supply. The position of the
eccentrics d d has in this case to be so altered that first the valve e¹ and then
somewhat later the valve e is opened so that at first the cold water flows in
order that a safe use of the mixing cock with respect to scalding the bather, is
insured.
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 mixing cock for bath and other purposes distinguished by the valves
-controlling the inlet of cold and hot water being opened by two eccentrics or cams
on a spindle the parts being so arranged with respect to each other that on rotating
the spindle first the cold water valve and then somewhat later the hot water valve is
raised from its seat substantially as described.
2. In a mixing cock in which the cold water and hot water valves are operated
from a single spindle and so that the cold water valve is opened first, providing the
mixing chamber with a nozzle leading by a passage to the cold water or to the
steam valve, substantially as described.
Dated this 28th day of May 1894.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.