Improvements in Apparatus for Delivering Measured Quantities of Liquid.
Year: 1889

page_text: Date of Application, 14th May, 1889
Complete Specification Left, 14th Feb., 1890-Accepted, 15th Mar., 1890 :
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Delivering Measured Quantities
of Liquid.
I, FRANCIS EDWARD MACMAHON of 24 Great Windmill Street in the County.
of Middlesex Engineer do hereby declare the nature of this Invention to be as
follows:-
Apparatus for delivering measured quantities of liquid has before been suggested in
which the liquid is admitted into and drawn off from a cylinder in which there is a
plunger the quantity of liquid delivered being varied by limiting the travel of the
plunger and it has also been proposed to make a tight joint between the plunger and the
cylinder by means of an exhaustible tube of india rubber or other material. My
present Invention relates to such apparatus.
In order to make the elastic tube expand and contract in a regular manner and
without creasing or splitting I employ a number of metallic rings in the form of thin
annular plates of equal size which I place alternately inside and outside the india
rubber so that it assumes a bellows-like form.
In order to protect the india rubber tube from injury I make the walls of the
cylinder double placing it between them. The outer wall is carried up higher than
the inner wall or cylinder proper and forms a casing protecting the india rubber
however far the plunger is forced out.
Improvements in Apparatus for Delivering Measured Quantities
of Liquid.
I, FRANCIS EDWARD MACMAHON of 24 Great Windmill Street, in the County
of Middlesex, 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 :-
Apparatus for delivering measured quantities of liquid has before been suggested in
which the liquid is admitted into and drawn off from a cylinder in which there is a
plunger the quantity of liquid delivered being varied by limiting the travel of the
plunger and it has also been proposed to make a tight joint between the plunger and
the cylinder by means of an extensible tube of india rubber or other material. My
present invention relates to such apparatus.
In order to make the elastic tube expand and contract in a regular manner and
without creasing or splitting I employ a number of metallic rings in the form of thin
annular plates of nearly equal size which I place alternately inside and outside the
india rubber so that it assumes a bellows like form.
In order to protect the india rubber tube from injury I make the walls of the
cylinder double placing it between them. The outer wail is carried up higher than
the inner wall or cylinder proper and forms a casing protecting the india rubber
however far the plunger is forced out.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a vertical section of so much of a measuring apparatus as is necessary to
illustrate the present invention.
.
Figure 2 is a modification of the same.
Figure 3 is a plan of one of the outside rings, and
Figure 4 is a plan of one of the inside rings.
A is the measuring vessel or cylinder having within it the plunger B. is an
extensible india rubber tube which is kept in form by rings D and E placed alternately
on the inside and the outside. The lower end of this tube is fastened to the cylinder
between its double walls A A¹. In Figure 1 it is secured by wires to corrugations in
the cylinder. In Figure 2 it passes completely down the cylinder and is nipped at
the bottom between the two thicknesses.
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
in apparatus of the class referred to, is :-
1. The use of rings alternately inside and outside the extensible tube substantially
as described.
2. The arrangements substantially as described and shown in the drawings.
F. E. MACMAHON.