Improvements in Syringes.
Year: 1890

page_text: Date of Application, 21st June, 1890-Accepted, 9th Aug., 1890
COMPLETE SPECIFICATION.
Improvements in Syringes.
We JOSEPH LUCAS, and HARRY LUCAS, both of The Tom Bowling Lamp Works,
Little King Street, Birmingham, Warwickshire, Lamp Manufacturers, and WALTER
SAMUEL BENTLEY, of 37 Perry Street, Wednesbury, Staffordshire, Mechanic, 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 chiefly to metallic syringes, but may be applied also to
syringes made of such material that are liable to become bruised or dented in their
barrel part, and the object of this our invention is to provide a plunger for such
syringes that will accommodate itself to their bruised or dented barrels.
It has long been a matter of trouble and inconvenience in garden syringes for
instance, when the said syringes have been in use for a time (unless exceeding care
has been taken) their barrels become more or less bruised and dented, and with the
ordinarily made plungers-when such is the case-they will not pass such dents, and
if made sufficiently small to do so, leakage takes place and consequently then perfect
working is impaired.
As before intimated this our invention is made with a view to overcome these
defects, and consists of a plunger having an external cup or cups of felt,
leather, or other suitable material in combination with an internal washer of
india-rubber.
We are aware that prior to this our invention, plungers have been made in which
the cups have been made of india-rubber, or other yielding substance, but by reason
of the supporting washer being of a much harder material the yielding property of
the said cups have been thereby limited. In this our invention however, we provide
that the said supporting washer shall be of india-rubber, which affords a steady
and firin support to the cup against the inside of the barrel, while at the
same time, permits of a ready yielding when the plunger is passing a dent or
bruise.
In order to more clearly explain this our said invention, we have appended here-
unto 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, shows an enlarged sectional elevation of the barrel and plunger.
Fig. 2, is a general view of the syringe.
«, is the barrel; b, b, b, represent dents or bruises assumed to be made in the said
barrel; c, e, are plunger cups made preferably of felt, but which may be made of soft
leather or other suitable material. d, d, are yielding supporting washers, made of
india-rubber. The arrangement and construction is readily understood from the
drawings.
In Fig. 1, at ', it will be observed how the yielding of the flexible supporting
washer d, permits of the cup passing a bruise or dent, without interferring with the
working of the plunger.
Having now particularly described and ascertained the nature of our said inven-
ion, and in what manner the same is to be performed, we declare that what we
claim is :
The combination in a syringe plunger. with the external cup or cups c. c. of a

page_text: yielding or india-rubber supporting washer or washers d, d, constructed and
operating, substantially as hereindescribed and illustrated, and for the purposes
specified.
Dated this 20th day of June 1890
JOSEPH LUCAS.
HARRY LUCAS.
WALTER SAMUEL BENTLEY.