Improvements in the Valves, Pistons, and Piston Connections of Gas Pumps.
Year: 1890

page_text: Date of Application, 21st Feb., 1890-Accepted, 22nd Mar., 1890
COMPLETE SPECIFICATION.
Improvements in the Valves, Pistons, and Piston Connections of
Gas Pumps.
Communicated from abroad by FRANCIS WARNER PARKER, of 1007 Opera House
Block, Chicago, United States of America, Solicitor.
I FREDERIC O'CONNOR PRINCE, of 1 Quality Court, London, W.C. in the County
of Middlesex, Patent Agent 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 the valves pistons and piston connections of gas pumps
such as are used in ice machines.
Figure 1 is a vertical section of the cylinder.
Figure 2 a cross section thereon.
Figure 3 a modification of the valve.
Like parts are indicated by the same letter in all the figures.
A is a cylinder having near its base the holes B B and the holes CC which connect
with the annular passage D. E is the base of said cylinder upon a suitable support F.
G is the induct valve at the top of said cylinder and H the educt valve, each secured
in the hollow removable head J of the cylinder; K is a chamber in one side of the
head which opens into the valve space and also into a conduit L which leads to the
annular space D. M is a similar chamber in the opposite side of the head which
connects with the passage way N which opens into the discharge pipe 0.
P is a
supply pipe which opens into the annular chamber D. R is a water jacket resting
upon the collar R' and surrounding the upper part of the cylinder together with its
valve and removable tubular head. S is a piston, T a piston rod. The cylinder A is
cast in one piece as shown in figure 1, containing the two vertical ways Land N.
UU are links leading from the pitman to the cross head V₁, to which cross head the
piston rod T is secured. The rod is screw threaded at its lower end and provided
with the nuts V2 V3 oppositely faced on opposite sides of the cross head proper. This
cross head proper consists of the main portion or yoke V' provided with the laterally
tubular portions V3 V' on which the links are journalled and the spiral spring Vin
the cavity, the upper portion of same being covered by the annularly grooved cap V.
The piston rod T is secured to a similar annularly grooved cap W, which covers the
spiral spring W in a like cavity in the lower portion of the piston S. . This cap is
prevented from escaping from such cavity by means of a screw threaded ring W.
In figure 3.I have shown a modified form of the educt valve in which the stem of
the valve passes upwardly and terminates in a cup X, within which bears the spiral
spring X, said spring bearing against the screw threaded cap X2 having the nut X
at its upper extremity and the screw threads X to engage the screw threaded
portion X of the valve cage X, the lower portion of which forms a valve seat X
and has the ledge X to engage the inner portion of the lower shell of the head J.
The packing X is used to make a tight joint between the head J and the edge of
cap when necessary.
When the piston is in the position indicated in figure 1, the cylinder A is full of
gas at the pressure of the gas in the pipe P, for its interior chamber is connected
with the pipe P by means of the apertures B. B and the annular way D. If now,
the piston begins its upward stroke, the gas in the cylinder A is immediately
compressed until the valve H is elevated and the charge of gas contained in the
cylinder A. is discharged into the aperture M, way N and pipe O.
On the upward
stroke, however, that portion of the cylinder beneath the piston S is filled with gas
und in the descending stroke this charge of gas is discharged through the apertures C
and annular way D, way Land aperture R and valve G in the upper portion of the

page_text: cylinder above the piston S. If at any time it is desired to alter or remove the
pipes which connect the cylinder or pump with the discharge and supply chambers,
these pipes O and P may be easily removed without interfering with the other operating
parts of the cylinders; this is accomplished by the use of the ways L and M cast
continuous with and forming part of the body of the cylinder. On the other hand,
if it is desired to remove the valves or change or alter them, the hollow head J may
be removed and such change or alteration made without disturbing the pipes O and P ;
this is an important feature of my device. The structure of the valve, as shown in
figure 3, is designed to more effectually cushion the valve but may be dispensed with
for the structure shown in figure 1. The springs in the piston and cross head are
designed for a slightly yielding and thus elastic connection between the driving power
and the piston.
This is important in many instances to obviate that injury to the
parts which would result if their connection was rigid and some obstruction should
find its way into the cylinder. Either of these springs might be dispensed with, or
indeed in many forms and devices neither is necessary. The preferable form is
that shown in the cross head and particularly so for the tension of the spring can
in this way easily be fixed by the adjustment of the nuts V* V*.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is ;
1. The spring V* arranged to make the connection between the piston and cross
head elastic.
2. The two springs V₁ and W₁ arranged so that the connections between the
piston rod and piston and cross head are both elastic.
3. The spring W₁ in the piston to make the connection between the piston and
rod elastic.
4. The cylinder having the lower contracted end, the annular passage D and the
openings B B and C C.
5. The hollow head J having the valves G and H. and the connecting
passages L, K, M and N and the discharge and supply pipes as and for the purpose
specified.
6. The cylinder in combination with the supply pipe P, the annular passage D
and the holes B B and CC arranged at such distance with reference to the size of
the piston head, as that the supply normally opens into the lower part of the cylinder
and the piston is at this extremity in a lower position.
Dated this 21st day of February 1890.
II מ
OOONNAD PRINAN
FREDO. O'CONNOR PDINAL