Improved Construction of Bellows or Blowing Apparatus.
Year: 1891

page_text: Date of Application, 13th Aug., 1891-Accepted, 5th Sept.,
1891
Improved Construction of Bellows or Blowing Apparatus.
1, HERBERT FOX STANDING, of Cadogan Moor, Church Road, Bournemouth,
in the County of Hants, Missionary, 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 invention relates to an improved construction of treadle bellows or blowing
apparatus intended more particularly for use in connection with the apparatus for
perforating stencils described in my application for a Patent dated 16th December
1890 No. 20517 but which is also applicable for other purposes, such as for working
blow pipes, small furnaces &c.
I will proceed to describe the construction of the said apparatus with reference
to the accompanying drawings, in which
Figure 1 shews a longitudinal section,
Figure 2 a cross section on line X X of Figure 1, and
Figure 3 a part plan and a section on line YP of Figure 1.
The apparatus is constructed firstly of a lower frame composed of a central valve
box or air chamber A, from opposite sides of which extend elliptically shaped
sloping frames B, resting with feet C C on the ground, and preferably formed
with a surrounding flange D adapted to receive within it the wooden bottom E of
the flexible bellows proper E'.
The flanges D are raised and thickened at D' at the middle of the valve chamber
in order to form the joint with the treadle plate H.
The valve chamber A which may either be rectangular as shewn, or of any
other shape, is closed on its underside by an air tight fitting cover F secured by
screws G. It contains two delivery valves I which may be of any suitable
construction, as for instance in the form shewn more clearly in the perspective
view of one of them at Figure 4. They are formed of two flat pieces of caoutchouc
secured together round the edges in an air tight manner, so as to form a flat bag.
Holes are formed through them at I', and they are secured to the ends of branch
pipes J fixed in the boards E of the bellows and fitting air tight through holes in
the top of the valve chamber.
At the side of the latter is a branch pipe K to which is connected a flexible pipe
for conveying the air blast to wherever required.
The boards of the bellows E have ordinary suction valves L. Upon the top
boards E2 of the bellows.rests the treadle plate H having a projecting rim O round
it, which is deepened and thickened at O¹ and is connected to the parts D¹ of the
flange D by pins P so as to form a hinge joint. The plate H is provided with
caoutchouc pads Q for the feet to press upon.
It will be seen that on rocking the plate H by the feet, the two bellows are
caused alternately to draw in air and to force it through the valves I into the valve
chamber A whence it issues through the branch pipe K.
When the bellows are drawing in air, the two flat pieces forming the valve 1 are
pressed closely against each other by the pressure in A, and thus prevent such air
pressure from passing back into the bellows.
In applying the above described bellows to purposes requiring a continuous air
current of as uniform a pressure as possible, such as is required for working the
perforating apparatus above mentioned, I prefer to combine with the discharge
pipe an elastic air vessel, which may conveniently consist of a caoutchouc ball
suspended from the table as shewn at R. Figure 5.
"
Instead of the valve arrangement shewn by Figure 4, I may employ valves of a
novel character as I shall describe referring to Figures 6, 7, 8 and 9.

page_text: As shewn in Figure 6 the two discharge passages J are connected by a pipe P
of enlarged diameter in its middle part from which there are openings to the
discharge pipe K and in this middle part there is a shuttle valve S cylindrical in
shape with conical ends free to travel to and fro, seating against the coned shoulders
within the pipe P. As the construction of the pipe P shewn in Figure 6, and the
introduction of the shuttle S into it may be attended with some practical difficulties,
the modification shewn in Figure 7 may be adopted. In this case the pipe P has a
couple of caoutchouc rings e inserted into it and kept in place by pieces of internal
pipe p inserted behind them. The valve in this case is a ball which can travel
to and fro seating itself against the rings c.
P
As shewn in section in Figure 8 and perspective side view Figure 9, pipes from
the discharge passages J both open into a narrow box passing through its sides.
From the upper edge of the box is suspended a flap of oiled silk or other flexible
impervious material which acts as a valve covering the opening from J on either
side when air is blown in on the other side.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is
1. A treadle bellows consisting of a valve chamber A having two sloping side
frames B C D for supporting the two flexible bellows E E E and a double treadle
plate H resting on the upper sides of the bellows and pivotted at P to the valve
chamber A into which the air passes from the bellows through pipes J and
valves I and from which the air is discharged by a pipe K, substantially as
described.
2. A. discharge valve for double bellows consisting of a shuttle or ball arranged
to move to and fro within a tube opening from both bellows, and to scat on either
side of lateral openings from the tube, substantially as described with reference to
Figures 6 and 7.
3. A discharge valve for double bellows consisting of a flexible flap suspended
within a box between openings from both bellows, substantially as described with
reference to Figures 8 and 9.
Dated this 13th day of August 1891.
ABEL & IMRAY,
Agents for the Applicant.