Improvements in and connected with Compound Steam Engines.
Year: 1893

page_text: Date of Application, 25th Aug., 1893
Complete Specification Left, 25th May, 1894-Accepted, 21st July, 1894
PROVISIONAL SPECIFICATION.
Improvements in and connected with Compound Steam Engines.
I, FERDINAND BOSSHARDT, of the Firm of F. Bosshardt & Co., of 4 Corporation
Street, Manchester, in the County of Lancaster, Patent Agent, do hereby declare
the nature of this invention which has been communicated to me from abroad by
Johann Rudolf Frikart, of 24, Karlstrasse, München, in the German Empire,
Engineer, to be as follows :-
:-
This invention relates to improvements in and connected with compound steam
engines with double or further expansion and consists in arranging the cranks
diametrically opposite each other at 180 degrees, so that the pistons are moving in
opposite directions.
In constructing a steam engine for double expansion the steam enters the high
pressure cylinder through two valves and after having expanded enters the low
pressure cylinder through two other valves and after further expansion is permitted
to escape to the atmosphere or into a condenser through two exhaust valves.
In lieu of two cylinders three or more may be employed but each piston must
move opposite relative to the adjacent one and each cylinder receive the expanded
steam from the cylinder adjacent.
The admittance of steam into the first or high pressure cylinder is controlled by
a shaft governor and with a view of best utilizing the room at disposal on the shaft
three pendulum weights are suspended on studs arranged on the fly wheel at equal
distances apart from the centre thereof and 120 degrees apart from each other.
Three springs are arranged to counteract the centrifugal force of the pendulum
weights. By means of three rods the latter are connected to an eccentric arranged
to rotate on the crank shaft which eccentric is positioned inside the eccentric which
moves the valves and imparts motion to the latter eccentric by its strap and a stud
thereon. The eccentric which moves the valves oscillates on a fulcrum forming
preferably a part of the stud of one of the pendulum weights.
Dated this 94th day of August 1893.
F. BOSSHARDI & CO.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Improvements in and connected with Compound Steam Engines.
I, FERDINAND BOSSHARDT, of the Firm of F. Bosshardt & Co., of 4, Corporation
Street, Manchester, in the County of Lancaster, Patent Agent, do hereby declare
the nature of this invention which has been communicated to me from abroad by
Johann Rudolf Frikart, of 24, Karlstrasse, München, in the German Empire,
Engineer, 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 improvements in and connected with compound steam
engines with double or further expansion, and consists, firstly, in arranging the
ranks diametrically opposite each other at 180 degrees, so that the pistons are
moving in opposite directions, and secondly, in a certain construction of shaft

page_text: And in order that my invention may be more fully understood I have caused to
be appended hereunto two sheets of drawings marked with letters of reference
indicating like parts in the various figures.
Fig. 1, Sheet 1, is an elevation partly in section of a compound engine with
double expansion constructed in accordance with my invention.
Figs. 2 & 3, Sheet II, are respectively a longitudinal section and side view at an
enlarged scale of the shaft governor used in connection therewith.
In constructing a steam engine for double expansion the steam is caused to enter
the high pressure cylinder I through two valves 1 & 1' and after having expanded
enters the low pressure cylinder II through two valves 2 & 21 and after further
expansion is permitted to escape to the atmosphere or into a condenser through two
exhaust valves 3 & 31.
In lieu of two cylinders three or more may be employed but each piston must
move opposite relative to the adjacent one and each cylinder receive the expanded
steam from the cylinder adjacent.
The admittance of steam into the first or high pressure cylinder I is controlled
by a shaft governor, see more particularly Sheet II, and with a view of best
utilizing the room at disposal around the shaft three pendulum weights A, B & C
are suspended on studs a, b & c arranged on the fly wheel F at equal distances
apart from each other. Three springs F1, F2, F³, are arranged to counter-act the
centrifugal force of the said pendulum weights. By means of three rods G¹, G³, G³,
the said weights are connected to an eccentric E arranged to rotate on the crank
shaft E' which eccentric is positioned inside the eccentric S which moves the
valves and by its strap H and the stud Z imparts motion to the eccentric S. The
latter oscillates on a fulcrum Y, which in the drawing is shown as forming a part
or extension of the stud b of one of the pendulum weights.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim, is-
"In compound steam engines in which the first cylinder receives live steam and
the others exhaust steam in successive order."
1st. Forming the cranks on the crank shaft diametrically opposite each other so
that the piston of one cylinder moves in an opposite direction to that of the
adjacent cylinder, one valve at each cylinder side always admitting steam into the
first cylinder, a second valve transferring the steam from the first cylinder to
the second cylinder, a third valve from the second cylinder to the third cylinder
and so forth, whilst the last pair of valves cause the exit of the steam from the
last cylinder to the atmosphere or to a condensor, all substantially as set forth.
2nd. Regulating the admittance of steam into the first or high pressure cylinder
by means of a shaft governor, consisting of three pendulum weights and three
springs so arranged as to fill up as much as possible the space around the crank
shaft and thereby increase its momentum, substantially as set forth.
3rd. The employment of the eccentric E inside the eccentric S and the coupling
of the same by means of the eccentric strap H and stud Z, all substantially as set
forth.
Dated CHE
y or Lay 1004.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.