Improvements in and relating to Steam-engines.
Year: 1895

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by SOCIÉTÉ ANONYME DES ACIERIES,
FORGES, ET ATELIERS DE LA BIESME, of Bouffioulx, in the Kingdom
of Belgium.]
Improvements in and relating to Steam-engines.
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I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co, Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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 steam engines and comprises an improved variable
expansion gear.
In the accompanying drawings I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a vertical section of the cylinder.
Figure 2 is a front view of the frame of the engine and of the cylinder showing
the distributing mechanism.
Figure 3 is a transverse section of the cylinder and
Figure 4 is a side view of the engine at right angles to Figure 2.
Similar letters of reference indicate corresponding parts in the several figures of
the drawings.
In carrying the invention into practice the steam passes into an admission box A
and enters the engine cylinder B through a side valve C which is actuated by
a cam D adapted to move vertically and two levers E and F secured upon an
axis G communicating the movement to the said slide valve C through the medium
of a rod H. When the piston P arrives in a certain position determined by the
quantity of steam to be admitted into the cylinder the slide valve is closed by a
piston enclosed in a small cylinder J; the pressure of the steam which arrives
I
in the latter through a tube K moves back the slide valve against the cam.
closing of the escape valve is effected by a piston L enclosed in a second small
cylinder M.
The
The aforesaid slide valve C being closed, the expansion takes place during the
remainder of the movement of the piston minus the lead given to the escape valve.
When the piston P arrives in the position determined by the lead of the escape
valve, the valve N opens and the escape takes place through the valve box O.
This escape valve N is actuated by a cam Q secured upon a vertical shaft R.
A lever T adapted to move upon an axis S communicates the motion through the
medium of a rod V to the said escape valve N.
With the aid of a cam Q' secured upon the vertical shaft R the second escape
valve N is operated through lever T¹ by the same movement as that of the
first escape valve N.
The piston continuing its movement the second escape valve N¹ is closed at the
desired moment for obtaining the determined compression.
Then the second admission valve C¹opens and steam arrives in the cylinder
through this valve C¹ which like the first admission valve is closed according to
the quantity of steam to be admitted.
This second admission valve C is operated by a cam D and two levers E' and F¹
fixed upon an axis G¹ and communicating motion to the said valve through the
f

page_text: The movement of the aforesaid two levers and F¹ takes place in the opposite
direction to that of the two levers E-and-F; the piston which pushes back the
second admission valve C¹ produces the effect in the opposite direction and always
keeps the roller in contact with the corresponding cam D.
The variations in the admission of steam are obtained by raising or lowering the
said cam D which is provided with a conical part causing two of the levers E
and E to oscillate the distance necessary for admitting the determined quantity of
steam into the cylinder. The cam D is actuated from the interior of the shaft by
a sleeve W and a 'lever X operated by a screw Y and hand wheel L. A counter-
weight Z' balances the weight of this operating mechanism. Bevel wheels are
provided for actuating the before-mentioned vertical shaft R.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is:-
The herein before.described steam distributing. device with variable expansion
gear, constructed and arranged substantially as described and as represented in the
accompanying drawing.
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Dated this 1st day of October 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant..