Improvements in Syringes.
Year: 1891

page_text: Date of Application, 16th May, 1891
Complete Specification Left, 16th Feb., 1892-Accepted, 19th Mar.,
1892
PROVISIONAL SPECIFICATION.
Improvements in Syringes.
I, WILLIAM ARTHUR DAWKINS, of Holy Mount, Great Dodford, near
Bromsgrove, Worcestershire Brassfounder do hereby declare the nature of this
invention to be as follows:
This invention relates to improvements in the construction and arrangement of
syringes, and its object primarily is, to provide an improved means of adjusting
of the plunger, whereby such adjustment may be accomplished from the exterior,
that is, without the removal of the barrel end &c.; also to provide an improved
combination with the end of the barrel or the nozzle, of an inlet or ready supply
valve, in order that the supply may be more quickly drawn in,. than if drawn
through the ordinary. rose holes.
I provide upon the plunger central rod, a fixed collar, at the front of which
is carried the plunger itself, which consists of india-rubber, felt, or other suitable
material. At the front of the plunger, 1 further provide an adjustable collar
whereby the plunger may be compressed end wise in order to enlarge its diameter
to take up wear &c. This collar is screw-threaded upon, or within the central
rod or tube.
The precise arrangement and shape of this collar may be varied, while each
arrangement may effect the same end.
Now in syringes of ordinary make, in order to tighten up or adjust the said
plunger, the end of the barrel has to be removed and the plunger taken out,
but in this my invention this trouble is dispensed with as follows:-Upon
the front of the screwed adjustable collar I provide two lugs, or projections
which correspond to two similar lugs, projections or recesses, formed upon the
front end of the interior of the barrel, or upon the interior of the nozzle or rose,
so that in case any adjustment of the plunger is required, the said plunger is
pushed to the far end, when by turning around the handle, the collar may be
adjusted by means of the interior lugs, projections or recesses as aforesaid.
Again. In order to provide that the supply water may be more quickly drawn
inwards, I provide. at the front end of the syringe and in a suitable position an
inlet valve of as large a size as permissible, through which the water may be
readily drawn inwards, but which will be immediately automatically closed upon
the forward motion of the plunger.
By this means am enabled also to provide a rose having the finest possible
outlet holes, so as to produce as fine a spray as possible or what may be termed
mist," without the inconvenience and tediousness of having to draw inwards
the supply water through such fine holes.
В
Dated this 15th day of May 1891.
CHARLES T: POWELL,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Syringes.
I, WILLIAM ARTHUR DAWKINS, of Holly Mount, Great Dödford; near
Bromsgrove, Worcestershire, 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:-
This invention relates to improvements in the construction and arrangement of

page_text: i
syringes, and its object primarily is, to provide an improved means of adjusting the
plunger, whereby such adjustment may be accomplished from the exterior, that is,
without the removal of the barrel end &c.; also to provide an improved com-
bination with the end of the barrel or the nozzle, of an inlet or ready supply valve,
in order that the supply may be more quickly drawn in, than if drawn through the
ordinary rose holes."
In order to more clearly explain this my said invention, I have appended
.hereunto an illustrative sheet of drawings, upon which are figures and letters of
reference, similar letters referring throughout the several views to the same thing
or part, and in which :-
:-
Fig. 1, is a sectional view of the syringe, showing the various parts of this my
invention.
Fig. 2, is a detailed section on line 1-1.
Fig. 3, is a detailed view of the end of the barrel as prepared to receive the
collar at its front end.
Fig. 4, is an elevation, and Fig. 5, is a front end view in detail of the adjustable
'collar at the front end of the plunger, showing the lugs or projections.
A, is the barrel of the syringe, B, is the handle (shown in part). C, is the
plunger rod. D, D, are fittings upon which are secured the various reserve
roses &c. not in use.
I provide upon the plunger rod C, a fixed collar E, at the front of which is
carried the plunger itself, which as shown is constructed as follows:-
The collar E, is soldered to the rod C, and extended at its front part at F,
which is internally screwthreaded at its front end. Four (more or less) conical
collars G, G, G, G, are passed loosely on the barrel part F. Between each
pair of collars is placed the compressive material H, which consists of india-
rubber, felt or other suitable material. The compressive plunger itself forms no
part of this my invention. At the front of the plunger is provided the adjustable
'collar 1, having a screw part J, taking into the internal screwthread of the barrel
part. F, whereby the plunger may be compressed endwise in order to enlarge its
diameter to take up wear &c.
The precise arrangement and shape of this collar I, may be varied, while each
arrangement may effect the same end.
Now in syringes of ordinary make, in order to tighten up or adjust the said
plunger, the end K, of the barrel has to be removed and the plunger taken out,
but in this my invention this trouble is dispensed with as follows:-Upon the front
"of the screwed adjustable collar I, is provided two lugs, or projections L, L.
The
Again. At the front end of the barrel A, is provided the fixed collar M, (sec
Fig. 2) having the two lugs N, N. Two (opposite) slots, are made in the end of
the barrel (see Fig. 3), when the collar M, is passed thereon, the lugs N, N, fitting
'into the said slots, and thereby preventing the possibility of rotation.
collar M, is also soldered to the barrel A. The depth of the lugs N, N, is greater
than the thickness of the barrel, and therefore projects interiorly upon each side of
the latter, as seen at Figs. 1 & 2. Or if desired, the separate collar M, may be
dispensed with, and the lugs N, N, would then be formed upon the interior of the
rose P. Hence when any adjustment of the plunger is required, the said plunger
is pushed to the far end, when the projections L, L, pass into the collar M, and by
turning round the handle B, the said projections L, L, come in contact with the
lugs N, N, and thereby stop the rotation of the collar I, and thus it
adjusted towards or from the fixed collar E.
may be
Again. In order to provide that the supply water may be more quickly drawn
inwards, I provide at the front end of the syringe and in a suitable position an
inlet valve Q, of as large a size as permissible with openings R, R; R, through
which the water may be readily drawn inwards, but which will be immediately
automatically closed upon the forward motion of the plunger. The interior of this
valve I fill with sponge or other material S, so as to filter the water thus drawn in,"
and further provide a perforated or wire gauze plate at T, to prevent the

page_text: sponge &c. being gradually drawn under the valve. By thus filtering the water,
the pin holes of the rose are preserved from choking. By this means I am enabled
also to provide a rose having the finest possible outlet holes V, V, &c. so as to
produce as fine a spray as possible, or what may be termed a "mist," without the
inconvenience and tediousness of having to draw inwards the supply of water
through such fine holes.
Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed, I declare that
what I claim is :-
1. In syringes, the method and arrangement of exteriorly adjusting the plunger,
by means of projections L, L, and lugs N, N, or their equivalents, as described and
illustrated.
2. In syringes the combination with the rose P, of an inlet filtering valve Q
having the filtering sponge S, after the manner described and shown.
Dated this 15th day of February 1892.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicant's Agent.