An Improved Tap for Discharging Small Quantities of Liquid.
Year: 1895

page_text: Date of Application, 21st May, 1895
Complete Specification Left, 2nd July, 1895-Accepted, 24th Aug.,
1895
PROVISIONAL SPECIFICATION.
An Improved Tap for Discharging Small Quantities of Liquid.
I, JOSEPH ARNOLD, of 40, Clowance Street, Devonport, Engineer, do hereby
declare the nature of this invention to be as follows:-
My invention relates to what may be termed an improved drip tap, and it has
for its object to provide a tap whereby the liquid contained in the vessel to which
it is applied may be run off very slowly either in the form of a fine steady stream
or in separate drops at regular intervals without liability of the tap becoming
clogged. This clogging of the tap is liable to happen (especially in the case of
dilute sulphuric acid) by the evaporation and thickening of the liquid whilst
exposed to the air in the tubular discharge nozzle of a draw-off tap of the ordinary
kind, and it is the peculiarity of construction, whereby this clogging is avoided,
which constitutes the essential feature of my invention.
The invention consists in constructing the tap with a solid plug which is tapered
to a point and provided with a minute channel or groove by which when the tap is
turned into operative position the liquid is conveyed directly to the tapered lower
end of the plug whence it falls freely in isolated drops, the pointed form of the
plug counteracting the tendency of the liquid to adhere by capillary action and
facilitating the detaching of the drop.
The improved construction of tap is illustrated in the annexed drawing, which
represents a longitudinal section of the body of the tap, the plug being in
elevation.
A is the plug and B the body portion, both made of any suitable material, for
example of earthenware, or glass, (or of metal coated with an enamel adapted to
resist the action of the liquid) and of the usual form for taps made of that material,
except that the plug instead of being ported to give passage for the liquid to a
tubular discharge nozzle, or instead of being itself made tubular and adapted to
serve as a discharge nozzle, is made solid and projects below the socket portion B,
the part so projecting tapering to a point. The body of the plug is slightly coned
and ground into the socket B, as usual, and is provided with a fine vertical groove c
which when the tap is turned on communicates with the bore d of the stem, said
groove extending downwards below the socket or body portion B and partly down
the lower tapered part of the plug. The stem D is provided with lateral orifices e
for the passage of the liquid to the bore d and is preferably furnished with a
removable plugf at its inner end to facilitate the cleaning out of the bore d.
In order to equalize the flow, irrespective of the head of liquid in the vessel, a
siphon bend E may be attached to the inner end of the stem D after the latter has
been inserted in its socket in the vessel, the plugf being in this case removed.
It will be seen that this improved drip tap presents only the external convex and
gradually diminishing surface of the tapered part of the plug for the liquid to flow
down, so that there is no tendency for the liquid to thicken and accumulate in a
coagulated form, as it would do within the bollow or concave surface of a tubular
nozzle, the convergence of the exposed surface of the plug to a point promoting
the flow of the liquid down it, so that the liquid collects in the form of a drop
which becomes detached before the liquid has time to become thickened by
evaporation.
CM1905
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
!

page_text: An Improved Tap for Discharging Small Quantities of Liquid.
I, JOSEPH ARNOLD; of 40, Clowance Street, Devonport, 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:
:-
My invention relates to what may be termed an improved drip tap, and it has
for its object to provide a tap whereby the liquid contained in the vessel to which
it is applied may be run off very slowly either in the form of a fine steady stream
or in separate drops at regular intervals without liability of the tap becoming
clogged. This clogging of the tap is liable, to happen, (especially in the case of
dilute sulphuric acid), by the evaporation and thickening of the liquid whilst exposed
to the air in 'the. tubular discharge nozzle of a draw-off tap of the ordinary kind, and
it is the peculiarity of construction; whereby this clogging is avoided, which
constitutes the essential feature of my invention.
The invention consists in constructing the tap with a solid plug which is tapered
to a point and provided with a minute. channel or groove by which when the tap is
turned into operative position the liquid is conveyed directly to the tapered lower
end of the plug, whence it falls freely in isolated' drops, the pointed form of the
plug counteracting the tendency of the liquid to adhere by capillary action and
facilitating the detaching of the drop.
-
The improved construction of tap is illustrated in, the drawing annexed to my
Provisional Specification, which represents a longitudinal section of the body of the
táp; the plug being in, elevation.
A is the plug and B the body portion, both made of any suitable material, for
example of earthenware or glass (or of metal coated with an enamel adapted to
resist the action. of. liquid) and of the usual form for taps made of that material,
except that the plug instead of being ported to give passage for the liquid to a
tubular discharge nozzle, or instead of being itself made tubular, and adapted to
serve as a discharge nozzle, is made solid and projects below the socket portion B,
the part so projecting tapering to a point.. The body of the plug is slightly coned
and ground into the socket B, as usual, and is provided with a fine vertical groove c
which when the tap is turned on communicates with the bored of the stem, said
groove extending downwards below the socket or body portion. B and partly down
the lower tapered part of the plug. The stem D is provided with lateral orifices e
for the passage of the liquid to the bore d and is preferably furnished with a
removable plug at its inner end to facilitate the cleaning out of the bore d.
In order to equalize the flow, irrespective of the head of the liquid in the vessel,
a siphon bend E may be attached to the inner end of the stem D after the latter
has been inserted in its socket in the vessel, the plug. being in this case removed.
It will be seen that this improved drip tap presents only the external convex and
gradually diminishing surface of the tapered part of the plug for the liquid to flow
down, so that there is nó tendency for the liquid to thicken and accumulate in a
coagulated form as it would do within the hollow or concave surface of a tubular
nozzle, the convergence of the exposed surface of the plug to a point promoting
the flow of the liquid down it so that the liquid collects in the form of a drop
which becomes detached before the liquid has time to become thickened by
evaporation.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A drip tap whose plug has an external surface tapered to a point at the lower

page_text: end for the flow and drip of the liquid and a groove or passage adapted to connect
with the bore of the stem and leading to such tapered part, substantially as and for
the purpose specified.
2. The herein described drip tap provided with a solid plug whose lower end is
5 coned and projects below the socket, the body of the plug having an external groove
adapted to connect with the bore of the stem and leading to the coned surface,
substantially as and for the purpose specified.
Dated this 1st day of July 1895.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.