Improvements connected with Syringes.
Year: 1895

page_text: Date of Application, 13th June, 1895-Accepted, 21st Sept., 1895
Improvements connected with Syringes.
I WILLIAM ARTHUR DAWKINS of 40 Edmund Street, Birmingham, in the
County of Warwick, Brassfounder 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 of improvements connected with syringes refers to that class of
syringe such as is used more especially for garden and similar purposes, and my
improvements are connected firstly with the plunger of such a syringe, and secondly
with a kind of rose for such a syringe; the object of my improvements is to provide
a more perfect syringe than there is at present.
My invention will be best understood by aid of the accompanying sheet of
drawings on which
Figs. 1 and 2 are a side and an end view respectively of a syringe fitted with
my improvements, the front end of Fig. 1 being shown in section for illustration
purposes.
Figs. 3 and 4 are a cross section and a top view of my improved kind of rose,
such a rose being shown in Fig. 1 fitted to the upper side of the syringe.
Firstly. The syringe is of the usual form having handle, bushing or stuffing box,
plunger rod, barrel, and fittings for reserve roses, all of which will be seen in Fig. 1.
A is the plunger rod to the front end of which is fitted, preferably by soldering, a
small screwed spindle B. The compressible hollow cylindrical block C, of india
rubber, or other compressible material, and forming the body of the plunger, is
placed over this small screwed spindle B between the two circular, preferably
metallic, discs D and E. F is what may be termed a cross piece, also preferably
of metal and formed with a circular central portion or washer F¹ bearing against
the one side of the disc E. This cross piece must necessarily be tapped in order
to fit the screwed spindle B and it may also assume any form or shape, its purpose
being simply to present a metallic or hard surface to the disc E. A small screw G
holds the different parts together ou the spindle E. There are two small ribs H H
on the cross piece and also two corresponding ribs II on the inside of the front
end of the barrel. It will be understood that when the plunger works loose, the
barrel of the syringe is held securely in the one hand, the handle is pushed in as
far as it will go with the other hand, and is then turned round so that the ribs H H
come up against the ribs II. On still continuing to turn the handle, the cross
piece is twisted round on the small screwed spindle B, and bearing up against the
disc E the compressible block C gives out so that the plunger will work tight.
The object of this part of my invention is to prevent any of the movable parts, as
regards the compressible block, if, for instance, the compressible block be of india
rubber, becoming stuck, and so injuriously effecting the good working of the
syringe. It will be seen that the dise E which comes in contact with the com-
pressible block is, as regards such block, stationary. It is the cross piece F which
moves, and as that is of metal or other hard material and it bears up against a
metallic or other hard surface it is impossible for the parts to become stuck.
Secondly. The rose seen in Figs. 3 and 4 has a small central chamber J having
a small hole K bored or drilled at a tangent in its wall. L is a small cap with a
central hole N which is so made as to come to a feather or knife edge, that is to
say the orifice or hole gradually contracts or narrows as it reaches the underneath
surface of the cap L, as will be clearly seen by the enlarged views, Figs. 5 and 6,
P

page_text: which are respectively a cross section and a plan view of the cap. NNNN are
holes in the top O of the rose. P is a rubber or other washer fitted on the wall of
the central chamber J below the holes N N N N. It will be understood that
when this rose is in use water enters the syringe through the holes N N N N as,
When the plunger
owing to the suction; the washer P will leave the holes clear.
of the syringe is pushed out, the water is prevented passing out through the
holes N N N N as the washer P then closes them, and, as a consequence, the water
will pass through the tangential hole K into the chamber J and will then he turned
into a kind of a small whirlpool, the water finally escaping through the central
hole M and, coming in contact with the feather or knife edge, is distributed at
right angles in the form of a very fine mist. The object of this part of my inven-
tion is to provide a rose for a syringe which whilst being of a very simple
construction will also produce a very fine mist, without the application of numerous
very finely drilled holes which are not usually effectual and become clogged.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is :-
1. In a plunger for a syringe of the kind herein before described, the employment,
for the object specified, of a cross piece, such as (F), substantially as set forth.
2. In a rose for a syringe, of the kind hereinbefore described, providing for the
object specified, a chamber (J) with a tangential hole (K), and a central hole (M)
with a feather or knife edge, substantially as set forth.
3. The improved construction of plunger (Figs. 1 and 2) and rose (Figs. 3
and 4) for syringes, of the kind specified, substantially as herein before described
and shown.
Birmingham. June 12th 1895.
W. P. THOMPSON & Co.,
Agents for the Applicant.