Improvements in Air and Gas Compressors.
Year: 1899

page_text: Date of Application, 25th Jan., 1899
Complete Specification Left, 25th Oct., 1899--Accepted, 16th Dec., 1899
PROVISIONAL SPECIFICATION.
Improvements in Air and Gas Compressors.
I, AUGUSTUS BEVER, of Dewsbury Foundry, Northgate, Dewsbury, in the
County of York, Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to an improved arrangement of valves for air and gas
compressors and more particularly to the delivery or outlet valves and consists
in making these valves of the form known as Corliss valves and arranging so
that they are closed by positive and mechanical connection with some recipro-
cating or rotating part of the machine and opened by the pressure in the com-
pression cylinder rising to that of the receiver.
The usual method which I propose to adopt in an air or gas compressing
engine, is to provide each end of the compressing cylinder with a delivery
valve preferably of the Corliss form and on the top of the cylinder in a horizontal
engine, and to provide an eccentric on the crankshaft or on a shaft rotated by
the crankshaft, the motion from which shall be transmitted to two levers or
wrist plates, which shall reciprocate through the arc of a circle on the spindles
of the Corliss valves, and shall be so arranged that at the proper time in each
revolution the valves shall be positively closed by this reciprocating motion.
On each of the valve spindles shall also be fastened a lever, which shall be
connected by a rod to a piston in a small auxilliary cylinder, one end of this
cylinder shall be connected to the air receiver and the other end to the air com-
pressing cylinder and these connections shall be so arranged that when the
pressure in the compressing cylinder rises to that of the receiver, the valve is
automatically opened by the piston in the small auxilliary cylinder. To assist
this action I prefer to make the effective area on one side of the piston rather
more than that on the other side, or the piston may be assisted by a spring or
other similar means.
11
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T
1000
Improvements in Air and Gas Compressors.
I, AUGUSTUS BEVER, of Dewsbury Foundry, Northgate, Dewsbury, in the
County of York, 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 arrangement of valves for air and gas
compressors and more particularly to the valve gear for working the outlet or
delivery valves and consists in making these valves of the form known as Corliss
valves and arranging so that they are closed by positive and mechanical connec-
Price 8d1

page_text: tion with some reciprocating or rotating part of the machine and opened by the
pressure in the compressing cylinder rising to that in the receiver, the opening
of the valves being effected by a piston in a cylinder actuated by compressed air
operating directly a lever or crank arm fixed on the valve spindle without any
intermediate trip motion or other gear.
The usual method which I propose to adopt in an air or gas compressing
engine, is to provide each end of the compressing cylinder with a delivery
valve of the Corliss type, placed in the upper part of the cylinder in a horizontal
engine, and to provide an eccentric on the crankshaft or other shaft rotated by
the crankshaft, the motion from which shall be transmitted to two levers or wrist
plates which shall reciprocate through the arc of a circle on the spindles of the
Corliss valves, and shall be so arranged that at the proper time in each revolu-
tion the valves shall be positively closed by this reciprocating motion. On
each of the valve spindles shall also be fastened a lever, which shall be con-
nected by a rod to a piston in a small auxilliary cylinder, one end of this cylinder
shall be connected to the air receiver and the other end to the air compressing
cylinder and these connections shall be so arranged that when the pressure in
the compressing cylinder, rises to that of the receiver, the valve is automatically
opened by the piston in the small auxilliary cylinder. To assist this action Ï
prefer to make the effective area on one side of the piston rather more than on
The other side, or the piston may be assisted by a spring or other similar means.
In order to enable my invention to be thoroughly understood, I will describe
the same with reference to the accompanying drawing, which represents an
air compressing cylinder fitted with the improved valve gear. A A are the
two valve spindles on the outlet or delivery valves, B, B are two wrist plates
which reciprocate through the arc of a circle on these valve spindles, but are not
fixed to them. C is the main wrist plate which is connected to an eccentric on
the crankshaft or has reciprocating motion imparted to it by some other means.
D is a double-ended auxilliary cylinder, securely fastened to the main com-
pressing cylinder, the spaces behind the two pistons are connected to the two
ends of the main cylinder as indicated, the spaces in front of the pistons being
connected to the receiver or delivery pipe beyond the valves.
It will be seen that the effective areas behind the pistons are rather larger than
those in front of the pistons, so that when the pressures in front and behind
become equal the tendency of the pistons will be to move outwards. The two
pistons are connected by rods E, E to two levers or cranks F, F keyed on the
valve spindles A, A; G, G are contact pieces fixed on the wrist plates which
at the proper time come in contact with the levers F F and close the valves.
The operation of the gear explained with reference to the drawing is as
follows: The piston in the compressing cylinder is moving from left to right
and the air on the right hand side has been compressed to the receiver pressure,
this pressure acting behind the small piston on the right hand side of the
cylinder D has forced it out and thus opened the delivery valve, allowing the
air to be forced into the receiver. The movement of the main wrist plate C
however has brought the contact piece G against the lever F on the right-hand
side and the further motion will gradually close the valve so that when the
main piston has reached the extreme right-hand position the delivery valve shall
be completely closed.
The inlet valves for this improved air compressor may be either also of the
Corliss type or of any other suitable type but the present invention does not
apply to them.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In an air or gas compressor provided with outlet or delivery valves of the
Corliss tune the arrangement of valve gear for overating these valves so that

page_text: they are closed by positive and mechanical means and opened directly by the
air pressure acting on small pistons directly connected to levers fixed on the
valve spindles as herein before described.
2. The improved arrangement of valve gear constructed, arranged and
operating as hereinbefore described and represented in the accompanying
drawing.