Improvements in Air Bags and Valves for same for Pneumatic Copying Devices.
Year: 1899

page_text: Date of Application, 30th May, 1899
Complete Specification Left, 28th Feb., 1900-Accepted, 7th Apr., 1900
PROVISIONAL SPECIFICATION.
Improvements in Air Bags and Valves for same for Pneumatic
Copying Devices.
I, SAMUEL HENRY CROCKER, Engineer, of 31, Furnival Street, Holborn, do
hereby declare the nature of this invention to be as follows:-
My improvements relate to an air proof bag for use in pneumatic letter
copying devices and valves in connection with this bag through which it is
inflated and deflated.
I make my bag of ordinary or felted paper proofed or covered with a sufficient
quantity of indiarubber or covered or impregnated with other suitable substances
to ensure the same being air proof. In making my bag I cut a piece of paper
of sufficient size to allow for turning over the edges upon all four sides, and
then I take a separate piece of paper the size of the finished bag and by turning
over the edges of the larger piece upon the smaller one and securing the two
together by indiarubber solution an air tight paper bag is made, but I may
also make the bag in any ordinary well known manner. To ensure the joints
being perfectly air tight, I cover the same once or twice as may be required with
a thin coating of indiarubber solution. Before closing up one side of the bag
I make a perforation preferably in one of the opposite corners of a sufficient size
to permit a small rubber tube to be just squeezed through. This little tube is
for about half its distance covered with indiarubber solution so that when it is
partially drawn through the hole, which is slightly smaller than its own
diameter, the solution will when drawn up towards the end make a good air
tight joint between the bag and the rubber tube. A small piece of paper
similar to that of which the bag is made (or any other suitable material) is now
cut and well covered with rubber solution and attached at the corner
bag in which this rubber tube is placed and this said covering piece extends for
a short distance on both sides over the corner of the bag in order to strengthen
the same at its junction with the tube and this strengthening piece also continues
round a portion of the protruding rubber tube which forms the inlet for the air
to the bag thereby further assisting to make an air tight joint between the tube
and the bag. Into this rubber tube I fix and secure thereto a small metal tube
screw threaded on that portion which projects outwardly. The portion of the
tube which projects inside the bag is provided with a thin strip of metal (prefer-
ably tapered in shape) forced down the inside of the tube and projecting some "
distance from the end of the same into the bag and which is capable of being
turned around within the bag at an angle with the tube. The object of this
thin piece of metal so fixed within the metal tube (and bag) is to prevent the
said metal tube before mentioned from turning around when my improved bag
is held within the covers of a letter copying book or between the book and an
outer case.
of the
As an alternative I may attach a suitable piece of metal on the outer portion
of the tube for the same purpose.

page_text: I now provide another short metal tube having a socket screw threaded
internally to receive the screw threaded end of the metal tube fixed to the
bag. The socket aforementioned is provided with a perforated seating and when
the tube fixed to the bag is firmly screwed down against this seating there is
a clear air passage through the metal tubes to the bag, which allows of air being
pumped into the bag until it is inflated to the required pressure for copying
letters.
In order to deflate the air bag a small hole is provided through the socket part
of the outer tube slightly above the seating of the valve and when it is required
to release the air within the bag the two metal tubes are parted by unscrewing
and the air escapes from the bag through the small aperture in the socket.
The outer metal tube is attached to the required inflator and the other tube is
fixed to the bag as before described and the screwed end of the latter piece is
preferably slightly reduced in diameter to assist the escape of the air during
inflation.
Dated this 29th day of May 1899
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.
Improvements in Air Bags and Valves for same for Pneumatic
Copying Devices.
I, SAMUEL HENRY CROCKER, Engineer, of 31, Furnival Street, Holborn, 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 --
My improvements relate to an air proof bag for use in pneumatic letter
copying devices and a valve in connection with this bag through which it is
inflated and deflated.
In illustration of my invention, I will refer to the accompanying sheet of
drawings in which
Fig. 1 is a plan of an air bag provided with an inflating device,
Fig. 2 is a section of part of the air bag showing how it is formed, and
Figs. 3 and 4 are sections of the valve.
I make my bag of ordinary or felted paper proofed or covered with a sufficient
quantity of indiarubber or covered or impregnated with other suitable substances
to ensure the same being air proof. In making my bag I cut a piece of paper A
of sufficient size to allow for turning over the edges upon all four sides, and
then I take a separate piece of paper A¹ the size of the finihsed bag and by turning
over the edges a of the larger piece upon the smaller one and securing the two
together by india rubber solution an air tight paper bag is made, but I may
also make the bag in any ordinary well known manner. To ensure the joints
being perfectly air tight, I cover the same once or twice as may be required with
a thin coating of indiarubber solution Before closing up one side of the bag
I make a perforation preferably in one of the corners of a sufficient size to
permit a small rubber tube B to be just squeezed through. This little tube
is for about half its distance covered with indiarubber solution so that when
it is partially drawn fhrough the hole, which is slightly smaller than its own
diameter, the solution will when drawn up towards the end make a good air
tight joint between the bag and the rubber tube. A small piece of paper a
similar to that of which the bag is made (or of any other suitable material) is

page_text: now cut and well covered with rubber solution and attached at the corner of
the bag in which this rubber tube is placed and this said covering piece extends
for a short distance on both sides over the corner of the bag in order to strengthen
the same at its junction with the tube and this strengthening piece also con-
tinues round a portion of the protruding rubber tube which forms the inlet for
the air to the bag thereby further assisting to make an air tight joint between
the tube and the bag. Into this rubber tube I fix and secure thereto a small
metal tube screw threaded at c on that portion which projects outwardly. The
portion of the tube which projects inside the bag is provided with
a thin strip of metal D (preferably tapered in shape) forced down
the inside of the tube and projecting some distance from the end
of the same into the bag and which is capable of being turned
around within the bag at an angle with the tube. The object of this thin
piece of metal so fixed within the metal tube (and bag) is to prevent the said
metal tube before mentioned from turning around when my improved bag is
held within the covers of a letter copying book or between the book and an
outer case.
As an alternative I may attach a suitable piece of metal on the outer portion
of the tube for the same purpose.
I now provide another short metal tube E having a socket screw threaded
internally to receive the screw threaded end of the metal tube fixed to the bag.
The socket aforementioned is provided with a perforated seating e and when the
tube fixed to the bag is firmly pressed against this seating there is a clear
air passage through the metal tubes to the bag, which allows of air being pumped
into the bag until it is inflated to the required pressure for copying letters.
In order to deflate the bag a small hole e¹ is provided through the socket part
of the outer tube slightly above the seating of the valve and when it is required
to release the air within the bag the two metal tubes are parted (as shown in
Fig. 4) by unscrewing and the air escapes from the bag through the small
aperture in the socket. The outer metal tube is attached to the required
inflator and the other tube is fixed to the bag as before described and the
screwed end of the latter piece is preferably slightly reduced in diameter at c¹
to assist the escape of the air during inflation.
Having now particularly described and ascertamed the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
(1) An air proof bag for use in a pneumatic copying device, formed from
paper suitably treated and substantially in the manner described and shown.
(2) A valve for use with inflatable bags, comprising a screwed tube and tubular
socket having a seating to receive the end of the tube, and a perforation in
the side of the socket, the parts when screwed tightly together forming an air
tight passage extending through both socket and tube, and when partly un-
screwed opening the said passage to the atmosphere, substantially as described
and for the purposes specified.
(3) In combination with a valve of the kind claimed above, and an inflatable
bag, a stiffening piece fixed in the end of the said valve and extending at right
angles to it within the corner of the bag, substantially as described and shown
and for the purposes specified.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.