IMPROVEMENTS IN INDIA RUBBER PUMPS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35 Southampton Buildings, Chancery Lane, in the County of'
Middlesex do hereby declare the nature of the Invention for "IMPROVEMENTS
IN INDIA RUBBER PUMPS" to be as follows:
This Invention relates to the well known form of india rubber pump, .consisting:
of a curved tube of india rubber, which is compressed by a series of rollers made
to pass along it in succession and squeezing the sides together in close contact as
they pass, so that water or other fluid is drawn in at one open end of the tube
and delivered through the other open end, so long as the rollers continue in
movement.
.
Such pumps as heretofore ordinarily made and used, have been costly to keep in
repair, on account of the small resistance offered by the india rubber tube to the
wear of the rollers which pass over and compress it, and the consequent necessity
for its very frequent renewal.
The present Invention has for its object a novel method of making the flexible
tube and the rollers, so that destructive wear and tear. is prevented or greatly.
reduced.
For this purpose the india rubber tube is enclosed in a flexible preserving sheath
or case of leather, linen, hemp, felt, cotton, wool, asbestos, or other substance
sufficiently flexible not to interfere with the action of the internal india rubber
tube. Or sometimes instead of the sheath described, a flexible varnish or coating
may be applied to the surface of the india rubber tube. The sheath or coating
surrounding the india rubber tube for its full length preserves it from the rapid
wear caused by the passage of the compressing rollers over it.
In order still further to reduce the tendency to wear, the compressing rollers are
made of such a section as not to injure the tube. For instance, they may be made
with a groove round their circumference, square in section but having the corners
ED C31

page_text: well rounded off; or it may be more or less concave in section. These forms of
grooves presenting less surface in contact with the sheath round the india rubber
tube not only make the pump much more durable, but lighter and easier to use
and move.
I, EDMUND EDWARDS of the firm of Edwards and Co. Patent Agents and
Engineers, of 35 Southampton Buildings, Chancery Lane, in the County of
Middlesex do hereby declare the nature of the Invention for "IMPROVEMENTS IN
INDIA RUBBER PUMPS" 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 the well known form of india rubber pump, consisting
of a curved tube of india rubber, which is compressed by a series of rollers made
to pass along it in succession and squeezing the sides together in close contact as
they pass, so that water or other fluid is drawn in at one open end of the tube
and delivered through the other open end, so long as these rollers continue in
movement.
Such pumps as heretofore ordinarily made and used, have been costly to keep in
repair, on account of the small resistance offered by the india rubber tube to the
wear of the rollers which pass over and compress it, and the consequent necessity
for its very frequent renewal.
The present Invention has for its object a novel method of making the flexible
tube and the rollers, so that destructive wear and tear is prevented or greatly
reduced. For this purpose the india rubber tube is enclosed in a flexible preserving
sheath or case of leather, linen, hemp, felt, cotton, wool, asbestos, or other substance
sufficiently flexible not to interfere with the action of the internal india rubber
tube. Or sometimes instead of the sheath described, a flexible varnish or coating
may be applied to the surface of the india rubber tube. The sheath or coating
surrounding the india rubber tube for its full length, preserves it from the rapid
wear caused by the passage of the compressing rollers over it.
In order still further to reduce the tendency to wear, the compressing rollers are
made of such section as not to injure the tube. For instance, they may be made
with a groove round their circumference, somewhat square in section but having
the corners well rounded off as shewn in Figures 3 and 4 in the accompanying
Drawing; or it may be more or less concave in section as shewn in Figures 5 and 6.
These forms of groove presenting less surface in contact with the sheath round
the india rubber tube not only make the pump much more durable, but lighter and
easier to use and move.
The accompanying Drawing is in illustration of the Invention, Figure 1 being a
longitudinal section of the tube and its sheath; Figure 2 a transverse section

page_text: 4
through x, y, in Figure 1; Figures 3, 4, 5 and 6 views of compressing rollers of
different forms, and Figure 7 an elevation partly in section of the entire apparatus.
a is the india rubber tube, and b its preserving sheath or cover; c (Figure 7) is a
wheel revolving upon the axis e and upon which are mounted the rollers d, by which
the tube a and its sheath b are compressed as they revolve.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The method of enclosing the india rubber tube in a flexible sheath or coating,
substantially as and for the purpose described and shown in the Drawing.
2. The novel shape of the rollers which compress the flexible tube, substantially
as described and shewn in the Drawing.