Improvements in or connected with Syringes.
Year: 1895

page_text: Date of Application, 7th Aug., 1895
Complete Specification Left, 27th Apr., 1896-Accepted, 30th May, 1896
PROVISIONAL SPECIFICATION
Improvements in or connected with Syringes.
I, GEORGE FREDERICK REDFERN, of the Firm of G. F. Redfern & Co., The
General Patent Office, No. 4, South Street, Finsbury, in the County of. London,
Patent Agents, do hereby declare the nature of this invention (a communication to
me by The Butler Hard Rubber Co., of 33, Mercer Street New York, in the
United States of America, Manufacturers) to be as follows:-
The object of the invention is to provide a piston-rod for syringes which shall
have all the advantages inherent to hard rubber and none of its disadvantages.
In carrying out the invention the piston-rod is provided with a metal core
traversing centrally the entire length of the rod, and at the outer end the metal
rod or wire is preferably bent into an eye or ring. The whole of the piston-rod
including the eye is enveloped with a hard rubber coating which is vulcanized upon
the metal core.
As a result of this construction a strong and rigid rod is produced which if made
entirely of hard rubber would be liable to break, an accident of not infrequent
occurrence.
By vulcanizing and enveloping the whole of the eye or ring a rigid handle
for the piston-rod is produced, a construction not possible where hard rubber is
used alone, or where a metal wire rod is used having its outer end bent into the
form of an eye.
Dad thin 7th 1 of Anund 1005
Improvements in or connected with Syringes.
I, GEORGE FREDERICK REDFERN, of the Firm of G. F. Redfern & Co., The
General Patent Office, No. 4, South Street, Finsbury, in the County of London,
Patent Agents, do hereby declare the nature of this invention (a communication
to me by The Butler Hard Rubber Co., of 33, Mercer Street, New York, in the
United States of America, Manufacturers) and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
The object of my improvements, more particularly stated, is to provide a piston
rod for syringes which shall have all the advantages inherent to hard rubber and
none of its disadvantages.
For these purposes my invention consists in the following construction and
combination of a piston rod in a syringe, the details of which will first be fully
Bet forth and the patentable features then described and claimed.
Fig. 1 represents a central vertical section of a syringe, with a piston rod and
piston shown in elevation.
Fig. 2 is a central vertical section of the piston rod.

page_text: In the drawings
A represents the barrel of a syringe provided with the usual tip and cap.
B is the piston rod, and C, the piston.
"2015"
The piston rod is provided with a metal core D traversing centrally the entire
length of the rod, and at the outer end the metal rod or wire is preferably bent into
an eye or ring E. The whole of the piston rod including the eye is enveloped with
a hard rubber coating which is vulcanized upon the metal core D.
As a result of this construction I am enabled to produce a strong and rigid rod,
which if made entirely of hard rubber is liable to break, an accident of not infrequent
occurrence.
By vulcanizing and enveloping the whole of the eye or ring E a rigid handle for
the piston rod is produced, a construction not possible where hard rubber is used
alone, or where a metal wire rod is used having its outer end bent into the form of
an eye.
Other forms of handles may be substituted.
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 :-
:-
A piston rod having a central metal core and a hard rubber casing or exterior
vulcanized thereon.
his 27th day of April 1896.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.