Year: 1887

page_text: Date of Application, 15th Aug., 1887.
Specification Accepted, 23rd Sept., 1887.
I, ROBERT JOHNSON, of 55 Athol Road Manningham, Bradford, in the County
of York, 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 :-
The object of this invention is the compression of air and the delivery of the
compressed air in a steady stream and at a uniform pressure.
In order to enable my invention to be fully understood I will proceed to describe
the same with reference to the accompanying drawings in which figure 1 represents
a plan of the air compressor; figure 2 a sectional plan of the air compressing and
discharging cylinders; figure 3 an end sectional elevation of the same cylinders ;
figure 4 represents a plan of air compressing and air discharging cylinders the
pistons of both being operated from one and the same cross-head; figure 5 represents
a plan of the air compressing and the air discharging cylinders both of which are
fixed in the same axial line, and the pistons of both cylinders fixed to and actuated by
one long piston rod.
As shown in the drawings the motive power by means of which the air compressors
are driven is communicated to the drum represented at A which is fixed upon the
crank-shaft B. The air to be compressed is first admitted to the cylinder C through
the inlet pipes J, one, of which is connected with each end of the cylinder and is
furnished with a self-closing hinged valve L opening inwards. The air is compressed
by means of the piston E in the cylinder the piston being reciprocated by the
connecting rod G from the crank shaft B.
The air passes from the compressing cylinder C through the connecting pipes K
which are provided with self closing hinged valves M, into the discharging cylinder D
from whence it is expelled by means of the piston F, at the same pressure as has
been produced by the operation of the piston E in the cylinder C, as no further com-
pression takes place in the cylinder D which is merely a discharging cylinder
and reservoir for the air which has been already compressed. Valves operating
outwards are placed at each outlet of the cylinder D.
The piston F is actuated by means of the connecting rod H from the crank
shaft B.

page_text: The first cylinder C in which the air is compressed is represented as containing
double the volume as compared with the discharging cylinder D. In figures 1, 2, and 3,
both cylinders are of the same piston area but the discharging cylinder D has only
half the stroke of the compressing cylinder C.
In figures 4 and 5 the discharging cylinder D is represented as having the same
length of stroke as the compressing cylinder C, but half the piston area.
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 :-
The combination of the air compressing cylinder C, with the compressed air reservoir
and discharging cylinder D, both operating substantially in the manner and for the
purpose described and represented.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.