Improvements in Signalling Devices applicable for Speaking Tubes.
Year: 1891

page_text: Date of Application, 12th Jan., 1891
Complete Specification Left, 8th Oct., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Signalling Devices applicable for Speaking Tubes.
I, HAHNEMANN ADOLPHUS CUTMORE, of 88 Hereford Road, Bayswater in
the County of Middlesex, Electrical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to signalling devices especially suitable for speaking tubes
but also applicable for other pneumatic apparatus, for example pneumatic bells.
In carrying out this invention I prefer to employ an elastic ball preferably rubber
connected in a suitable manner with the speaking tube or other apparatus to which
it is to be attached. The lower half of this ball fits into a protecting cup of metal
vulcanite or other suitable material the upper portion of which may be screw-
threaded for the purpose of receiving the upper half or portion of the protecting
casing. The upper projecting portion of the ball is provided with an extension in
the form of a tube over which fits a cylindrical casing or tube of metal or other
suitable material carrying at its outer end a whistle or other signalling device and
preferably flanged and shaped at its inner end to suit the rubber ball.
The upper
half of the outside casing is provided with an aperture so that it may be placed
over the metal tube and then screwed on to the lower half of the casing and thus
complete the whole apparatus.
Dated this 12th day of January 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Signalling Devices applicable for Speaking Tubes.
I, HAHNEMANN ADOLPHUS CUTMORE of 88 Hereford Road, Bayswater, in the
County of Middlesex, Electrical 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 :-
This invention relates to signalling devices especially suitable for speaking tubes
but also applicable for other pneumatic apparatus, for example pneumatic calls.
In carrying out this invention I prefer to employ an elastic ball, preferably rubber,
connected in a suitable manner with the speaking tube or other apparatus to which
it is to be attached. The lower half of this ball fits into a protecting cup of metal,
vulcanite or other suitable material the upper part of which may be screw-threaded
for the purpose of receiving the upper half or portion of the protecting casing.
The upper projecting portion of the ball is provided with an extension in the form
of a tube over which fits a cylindrical casing or tube of metal or other suitable
material carrying at its outer end a whistle or other signalling device and preferably
flanged and shaped at its inner end to suit the rubber ball. The upper half of the
outside casing is provided with an aperture so that it may be placed over the metal
tube and then screwed on to the lower half of the casing and thus complete the
whole apparatus.
The accompanying drawing represents a vertical section through an apparatus
constructed according to this invention.
A represents the rubber ball or vessel having an extension A' formed as a tube,
upon which fits the metal or other protecting tube B carrying at its free end the
whistle or other signalling device C. The tube B at its inner end is flanged or
extended at B so as to fit upon the ball A in order that the end of the tube may

page_text: not cut or damage the ball when the latter is compressed. The edge of the flange
may if desired be rounded or beaded for the same purpose. The portion of the
ball opposite to the tube A¹ has a hole or opening for the passage of the short tube D
extending inwards from the half casing E to which it is connected. This tube D
extends beyond the casing and by it the whole device may be screwed or otherwise
secured to the pipe or fitting to which it appertains.
The casing E is formed in two parts E and E' circumferentially united at Es by
screwing, spinning or the like, and the portion of the upper cover E¹ surrounding
the tube B may with advantage be extended as at E³ so as to form a bearing for
the tube B to work in.
To send a signal the finger of the operator is placed upon the opening of the
signal C so as to prevent the air passing and the tube B pressed inwards,
compressing the ball A and forcing the air out of it through the tube D into the
pipe of the system and thus conveying the signal at the other end in the same
manner as if the operator blew down the tube. When a person at the other end
desires to give a signal he proceeds in the same manner or blows down the tube
when the puff of air passing up the tube D enters the ball A and passes by the
tube A' to the signal C which it sounds and thus calls attention.
It is desirable that the tube B when fully out should still to some extent
compress the ball A so as to prevent B from shaking or chattering.
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. In a signalling device for speaking tubes and the like the combination with a
collapsible ball or vessel such as A of a protecting casing such as E E' substantially
as described and illustrated in the accompanying drawing.
2. In a signalling device for speaking tubes and the like the combination with a
collapsible ball or vessel such as A of a tube or extension such as A¹ and covering
tube B substantially as described and illustrated in the accompanying drawing.
3. In a signalling device for speaking tubes and the like the combination with a
collapsible ball or vessel such as A of a tube such as B carrying the signal device
and adapted to compress the ball substantially as described and illustrated in the
accompanying drawing.
4. In a signalling device for speaking tubes and the like the combination with a
collapsible ball or vessel such as A of a casing such as E E' having an extension
such as E' and a tube such as B carrying the signal device and working in said
extension substantially as described and illustrated in the accompanying drawing.
5. In a signalling device for speaking tubes and the like a casing such as E E
by which the whole device is secured to its support divided as at E³ for the
admission of the collapsible ball substantially as described and illustrated in the
accompanying drawing.
D 1
ho 1001
H. A. CUTMORE.
W. P. Thompson & Boult,
Agents for the Applicant.