Improved Double Action Air Compressing Pump.
Year: 1899

page_text: Date of Application, 23rd Mar., 1899
Complete Specification Left, 23rd Jan., 1900-Accepted, 10th Mar., 1900
PROVISIONAL SPECIFICATION.
Improved Double Action Air Compressing Pump.
ROBERT GREGORY, 23, Brooksby Street, Islington, London, N., Mechanical
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention consists of a metal cylinder of suitable length & diameter.
Having covers fitted at both ends with inlet clack valves connected to the inner
side of each cover and faced with leather or any other suitable material. The
covers will be secured to the ends in the usual manner provision being made for
the piston to pass through the front cover having an ordinary stuffing box.
The plunger or piston head to be fitted with 2 or any number of steel rings.
The outlet valves may be either clack or any other suitable kind and which
will be contained in a seperate valve box placed at the extreame ends on top of
cylinder.
One side of the box to be removeable for the renewing of the valves when
necessary.
Also having a stop piece on the inside of the removeable cover, with set screw
to regulate the lift of the valves.
As the piston head or plunger travels from one end of the cylinder to the other
end the inlet clack valve on the inside of the cover, from which the piston is
travelling is opened by the vacuum thereby caused. Air enters the cylinder and
fills the vacuum on the return stroke this clack valve is closed and the outlet
valve in box on top is opened, thus freeing the cylinder at that end and causing
a vacuum at the other end.
The inlet valves thus admit air alternately, and it is forced through the outlet
valves into the accumulator alternately.
Improved Double Action Air Compressing Pump.
I, ROBERT GREGORY, of 23, Brooksby Street, Islington, in the County of London,
Mechanical 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:—
My invention consists of a metal cylinder of suitable length and diameter
having cylinder covers fitted at both ends with inlet clack valves connected
to the inner side of each, and faced with leather or other suitable material for
keeping the valves air-tight when closed. The covers are secured to the ends in

page_text: the usual manner, provision being made for the piston to pass through the front
cover and having an ordinary stuffing box. The plunger or piston head to be
fitted with two or any number of steel rings. The cylinder is fitted with two
outlet valves one near each end of the upper side of the cylinder through which the
air is forced by the piston into the compressed air receiver. These outlet valves
may be either clack valves or any other suitable kind, and each is contained in a
separate valve box and has a removeable side, and also a stop piece on this remove-
able cover, to regulate the lift of the outlet valves.
As the piston head or plunger travels from one end of the cylinder to the other
end, the clack valve fitted on the inside of the cover at the end from which the
piston is travelling is opened by the vacuum thereby caused; air enters the cylinder
and fills the vacuum and on the return of the piston, this clack valve is closed,
and the outlet valve in the box on top of cylinder is opened, thus freeing the
cylinder at that end, and causing a vacuum at the other end of the cylinder.
The inlet valves thus admit air alternately and it is forced through the outlet
valves into the accumulator alternately.
In the accompanying drawings Fig. 1, shows the elevation of the machine cut
through the centre. Fig. 2, shows a cross section through one of the outlet valve
boxes. Fig. 3, shows plan of outlet valve box seen from top.
In these figures A A is the cylinder B B the piston CC the two inner clack
valves DD the two outlet valves and boxes with removeable side and stop to
cach EE the two covers of the cylinder F F the removeable covers to the outlet
valves showing the stop-piece.
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. The double action arrangement substantially as described.
2. The employment for the purpose of clack valves as described.