Year: 1888

page_text: Date of Application, 18th Sept.. 1888
Complete Specification Left, 1st Mar., 1889
Complete Specification Accepted, 6th Apr., 1889
I EDWARD DAVIES of Thornton Read, Bradford Engineer, in the county of York,
do hereby declare the nature of this Invention to be as follows:-
=
The object is to prevent the rings from getting slack, and so keeping the piston
steam tight, also dispensing with the screws for holding the parts together, and
generally simplifying the piston.
employ a box piston formed of a flange with a screwed boss and inner shell or
rim which is also screwed on its outer periphery, another flange screws on to the
boss, and its rim or flange screws on to the rim of the other flange, so forming
box, and the packing or rings are between the two flanges which as the packing
wears, can be tightened up, and so the rings or packings are adjusted.
Dated this Seventeenth day of September 1888.
a
JOHN E. WALSH,
Crossley Street, Halifax,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Pistons for Steam and other
Engines.
1 EDWARD DAVIES of Thornton Road, 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 to prevent the rings from getting slack, and so
keeping the piston steam tight, also dispensing with the screws for holding the parts
together, and generally simplifying the piston.
I employ a box piston consisting of a flange with a screwed boss, and an inner
shell or rim, which is also screwed on its outer periphery, another flange screws on to
the boss, and its rim or flange screws on to the rim of the other flange, so forming a
box, and the packing or rings are between the two flanges, which as the packing
wears, can be tightened up, and so the rings or packing are adjusted.
DESCRIPTION OF DRAWINGS.
Fig. 1 is a front elevation in section of my improved piston.
Fig. 2 is a plan of Fig. 1.
Fig. 3 shows spring ring of piston with joint link.
I employ a box piston consisting of a flange A, with a screwed boss B, and an
inner shell or rim C, which is also screwed on its outer periphery, another flange D
screws on to the boss, and its rim or flange E screws on to the rim C of the other
flange A, so forming a box piston, and the packing or rings F, are between the two
flanges A and D, which as the packing wears, can be tightened up, by screwing up
the flanges and their lock nut G, and so the rings or packing are adjusted.
H is a lip upon the lock-nut for positively fixing the two flanges, (and preventing
any possibility of their working loose) by means of the set screw J tapped into the
flange K is the piston rod, L is the joint link for securing the two ends of piston 2
rings together. One or more rings may be used for each piston as required.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is :-
1. Box pistons formed by two flanges screwing one on to the other, so as to
dispense with bolts, and facilitate the tightening up of the rings, substantially as and
for the purposes described.
2. The lock nut with lip and set screw for permanently fixing the flanges,
substantially as shown and described.
3. The hollow piston rings constructed and attached substantially as shown and
described.
Dated this 28th day of February 1889