Year: 1896

page_text: Date of Application, 28th Dec., 1396--Accepted, 20th Mar., 1897
Fig. 6 an end elevation, and,
Fig. 7-a cross section on the line -, of the valve mechanism for controlling the
supply of water or other pressure fluid to the engine for operating it.
Fig. 8 is a side elevation of the main valve and Fig. 9 is a side and end viow of the
plug of the controlling cock or valve.
On the drawings the same reference letters wherever repeated indicate the same
parts.
The double acting ongine shown, is, in its general features of construction, somewhat
similar to that described and claimed in the Specification of my prior Patent
No. 18837 of 1889.
a is the air or gas compressing cylinder which is bolted on top of the water or other
fluid pressure cylinder b. The cylinder a is, preferably, larger in diameter than the
cylinder b. c is the piston of the cylinder a and d the piston of the cylinder b, both
the pistons are connected together by a piston rod e which passes through the stuffing
box f. 9,9', are air or gas inlets and outlets to and froin the cylinder a. hh, are
double valve arrangements similar in construction and action to those described in the
Specification of my prior Patent No. 18337 fitted on the branches 9, o'. 'is a pipe
connection leading the compressed air or gas from the cylinder a to the place where
required. ', are passage ways leading from the ends of the cylinder 6 to the interior
of the valve casing . are jointing webs for securing the valve casing to the side
of the cylinder b. is the water or other fluid pressure inlet to, the valve casing k.
is the exhaust outlet from the valve casing. m is a plug cock, having two
passages m, m in it, working tight in the extension of the casing. mis.the
spindle of the plug cock. o is a passage way leading from the inlet to the plug cock
and o' is a similar passage way leading froin the outlet or exhaust to the plug cock.
p is a passage way leading from the plug cock to one end of the casing k and pla
passage leading from the cock to the other end of the casing . q is a passage way
leading from the inlet to the ports g', 92, at each end of the casing. is a piston

page_text: valve, as shown at Fig. 8, which works in the interior of the casing. It has thickened
parts, and reduced parts 2, . In Figs. 4 and 5 the valve is shown in heavy
dotted lines. s, s' are india rubber discs secured in place at each end of the casing k
and having slotted passages s' cut in them. These discs serve as cushions and deaden
the noise made by the piston r as it moves from end to end of the casing.
Secured to the spindle m³ by means of a pinching screw is an arm t made with a
slot, in it. Passed through the slot in this arm, as shown at Fig. 1, is a screwed
connecting rod having nuts u' on it. This connecting rod is jointed at u², Fig. 1, to
an arm. projecting from the lower end of a bar o, which is fitted to the piston cand
passes down through a stuffing gland in the bottom of the cylinder a.
With this apparatus, presuming the piston valve r is in the position shown at Fig. 2,
the water or other pressure fluid, when turned on, enters by the pipe to the passage
way 9, thence by the port 22 and the space round the reduced part to the passage j
and the upper side of the piston d. The pressure acting on the piston forces it
downwards, and, at the same time, causes the piston c.to force air through the pipes g
and to the barrels or other place where required. As the pistons c and d descend
the bar w and connecting rod u also descend, until, eventually, the upper nut t
strikes against the art and causes it to turn the plug m so as to open communication
between the inlet 1, the passage o, and the passage p', and, also, between the outlet !',
the passage o, and the passage p so as to allow pressure fluid to pass along the
passage and slots to the top end of the piston r and also to allow exhaust fluid
to pass from the space at the lower end of the piston through the slot ** and passage
ways p and o' to the outlet . As a result of the inequality of pressure produced at
the top and bottom of the piston the latter is forced to descend and open
communication between the pressure fluid inlet 1, passage q, port q', the space round
the reduced part of the piston, and the passage so as to force the piston d
upwards again. The exhaust fluid from the top of the piston d escapes by the
passage and the space round the reduced part of the piston direct to the
outlet l'.
The movement of the cock m is, by the action of the nuts. u on the arm as
the bar wascends and descends, along with the pistons d, e, repeated at each stroke
of the engine so as to supply live fluid from the inlet and passage o through the
passages p, p, to either the top or bottom of the piston r and move the latter in order
to supply live finid from the inlet and passage g to the passage j and exhaust the
spent fluid from the passage j' through the outlet ', or vice versa.
The compound valve can be adapted for use, where suitable, with other forms of
raising, forcing or pumping apparatus besides that shown on the drawings.
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 consider novel and desire to claim is
1. The couponnd piston valve and plug cock constructed and arranged substantially
as hereinbefore described with reference to Figs. 3 to 9 of the drawings annexed.
2. The combination of a double acting engine, a bar w or its equivalent actuated' by
the engine, a connecting rod operated by the bar, and a compound plug cock and
piston valve for controlling the supply of pressure fluid to the engine operated by the
connecting rod, the whole being constructed and arranged substantially as hereinbefore
described with reference to the drawings annexed.
Dated this 24th day of December 1896.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.