Improvements in Pistons.
Year: 1892

page_text: Date of Application, 25th Aug., 1892
Complete Specification Left, 25th Apr., 1893-Accepted, 2nd June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Pistons.
1, THEODOR [ELLINGHAUS of Camen in Westphalia, Empire of Germany, do
hereby declare the nature of this invention to be as follows:-
The object of this invention is to construct pistons in such a manner that the
packing of the same is provided in as thorough a manner as possible by the water
steam etc. the back pressure being relieved and excess of friction avoided so that
both the packing ring and the cylinder walls are protected from too rapid wear.
The piston receives inner pressure through valves in its face. This pressure
through the medium of small pistons lying in a plane perpendicular to that of the
main piston acts upon the segment of the packing ring corresponding to each of
these secondary pistons, so that every part of this ring is uniformly pressed against
the inner cylinder wall so as effectively to close the joint.
Back pressure between the secondary pistons and the packing ring is avoided by
providing each of the secondary pistons and rods, the main piston and piston rod,
with perforations or ports enabling the back pressure (water steam air or the like)
to escape.
The rods of the secondary pistons and also these pistons themselves may be
guided and packed by means of spring or spring-controlled rings if required.
Where the main piston is of small size, a spiral spring may be substituted for
the secondary pistons it being so arranged as to act radially upon the packing ring.
The joints between the sections may be made to overlap, one end of a section
of the ring fitting into the end of the next section so that a tight joint is obtained.
Dated this 25th day of August 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Pistons.
1, THEODOR JELLINGHAUS, of Camen in Westphalia, Empire of Germany, 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 construct pistons in such a manner that the
packing of the same is provided in as thorough a manner as possible by the water,
steam etc., the back pressure being relieved and excess of friction avoided so that
both the packing ring and the cylinder walls are protected from too rapid wear.
In the accompanying drawings
Fig. 1 is a sectional elevation of the improved piston.
Fig. 2 is a cross section of the piston on line a Fig. 1, embodying slight
modifications. This view mainly shows the arrangement of the auxiliary pistons
and of the valves arranged in the main or driving piston.
Fig. 3 shows an improved packing ring composed of sections.
Figs. 4 and 4 arc detail end views of the overlapping portions thereof, and
Fig. 4B shows one of the segments of the packing ring.
The main piston A receives inner pressure through valves a' and a² (Fig. 1).
This pressure through the medium of small auxiliary pistons
acts upon
the segment of the packing ring d corresponding to each of these secondary
[Price 8d1

page_text: pistons, so that every part of this ring is uniformly pressed against the inner
cylinder wall so as effectively to close the joint.
Back pressure between the secondary pistons and the packing ring is avoided by
providing each of the auxiliary pistons and their rods, the main piston and piston
rod with perforations or ports (Fig. 2) enabling the back pressure producing
medium (water, steam, air or the like) to escape.
The rods of the auxiliary pistons and also these pistons themselves may be
guided and packed by means of spring or spring-controlled rings y (Fig. 2) if
required.
Where the main piston is of small size, a spiral spring may be substituted for
the auxiliary pistons it being so arranged as to act radially upon the packing ring,
The packing ring as shown in Fig. 3 consists of several parts or sections (say four)
which surround the piston in such a manner that each part may as before stated be
pressed by the corresponding auxiliary piston against the cylinder wall. The
joints between the sections may be formed by overlapping as shown by the detail
views 4 44 and 4", one end of a section of the ring (Fig. 4A) fitting into the end of
the next section (Fig. 4) so that a perfectly tight joint is obtained.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A piston with a packing ring or device consisting of a number of parts or
sections and characterized by the arrangement within the piston of a number of
auxiliary pistons 123 and by valves al a² in the main piston and adapted to
admit the water steam or the like into the interior of the piston whereby the
auxiliary pistons are pressed against the piston ring while ports a provided in the
auxiliary pistons and their rods in the main piston and its rod enable the back-
pressure producing medium to escape substantially as described and illustrated in
the accompanying drawings.
2. In the construction of piston described in the preceding claim the provision
of a piston or packing ring d consisting of a number of parts or sections tightly
fitting or overlapping each other substantially as shown in Figures 44 and 4
and adapted to be pressed upon by pistons or by a spiral spring attached to the
main piston for the purpose of obtaining a perfectly tight joint substantially as
described.
Dated this 25th day of Anvil 1902
W. P. THOMPSON & BOULT,
Agents for the Applicant.