Improvements in the Slide Valve Mechanism of Rotary Motors.
Year: 1898

page_text: Date of Application, 4th Apr., 1898-Accepted, 25th June, 1898
COMPLETE SPECIFICATION.
Improvements in the Slide Valve Mechanism of Rotary Motors.
I, MANN MAX FRIEDLAENDER, of Sellerstr. 6, Berlin, N., Germany, Factory
Proprietor, 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 mechanism for admitting steam to and shutting off
steam from the cylinders of rotary motors, the slide valve being quickly
completely opened or closed and retained in either of these positions a longer or a
shorter time according to the yield of work required of the motor so that steam is
always supplied to the motor unthrottled. Further, means are provided for
suddenly and completely closing the slide valve when the load is suddenly taken off
the motor.
The mechanism of the invention comprises a cam which by the extension or
contraction of its periphery for the time being determines the time of full steam
admission and complete cut off, the contraction and expansion, or closing and
opening of said cam, being effected through the lever mechanism of the slide valve
and retained a longer or a shorter time in either position.
In the accompanying drawing
Fig. 1 is a cross section of a rotary motor with the invention applied thereto.
Fig. 2 a vertical section on line x-x of Fig. 1 parts similar to those shewn on
the left hand side being left out on the right hand side.
Figs. 3 and 4 respectively a front view and a sectional view of the governor and
parts in connection therewith on the main shaft, the section being approximately
on line y-y of Fig. 3.
to.
Fig. 5 is a view of the slide valve lever mechanism.
Figs. 6 to 9 are details of the expanding and contracting cam above referred
Figs. 10 to 12 are views of the parts employed for suddenly closing the slide
valve.
Figs. 13, 14, shew cam mechanism for actuating the obturator 1 but not forming
part of the invention.
a is the slide valve for opening and closing the steam admission port. 6 the
steam chest in communication with the interior of the steam cylinder by passage c.
da lever fixed on the same spindle e as the slide a. Jointed to the lever d is a
rod F constructed in two parts f¹, f2, jointed together. g is an eye bearing
provided on the motor frame for carrying the lever h jointed to the part 2 of the
rod F and carrying at one end a roller i and at the other end acted against by the
spring k. is a cam fixed on the main shaft and serving to regulate the steam
admission. a guide slot in the cam in which slot the lengthening part 12
engages with its curved lug 13. ma link connecting the joint of the parts f¹, f,
with the lever m¹, m², carried on the motor frame. m³ a lug on the lever m¹, m²,
against which the cam n (Figs. 4, 11, 12) acts when this latter is displaced by the
governor. nl a pivot on the cam n for engaging in the slot n² of the disc o

page_text: (Figs. 4, 10). In the cam n are curved slots n³ (Fig. 11) in which engage the
pivots n (Figs. 6, 7) of the cam l.
The steam admission and cut off is performed by the slide a (Fig. 1) within the
steam chest b said slide being for this purpose moved to and fro from the rod F which
through the lever d turns the slide rod eso soon as the lever h jointed to the rod F is
moved by the cam when this comes in contact with the roller i. The movement
of the lever h corresponding to the form of the cam and the lever is maintained
in the position corresponding to the full open or completely closed steam port c
so long as the roller i glides on the uniform peripheral surface of the cam l,
therefore the time during which the steam port c is open or closed may be
increased or diminished by lengthening or shortening the uniform or circular
surface of the cam which is done by displacing the part 2 along the slot . This
displacement of the part 12 may be operated by the governor P.
For this purpose
there is keyed on the main shaft a disc p (Figs. 3, 4) which sets in rotation the
governor weights pl fixed on the outer ends of the levers p² mounted to turn on
the pivots pa fixed in the disc p. The opposite ends of said levers are connected
by links with a sleeve o¹ carried loose on the main shaft. This sleeve rotates
with the disc o but it can also turn in the direction of the rotary movement separated
from the disc p and this occurs when the levers and weights of the governor P
are moving or in action. When the weights p₁ are thrown outward by the
centrifugal force the levers p² turn on the pivots p³ and thereby communicate
through the links q an opposite turning movement to the sleeve o¹ so that this
latter and the disc p then move in contrary directions. On the sleeve o' is keyed
the disc o to which the cam part 2 is attached by screws said cam part being
guided by a projection 13 thereon in the slot 1 of the cam 1. When the disc o is
displaced in a direction contrary to the direction of movement of the main shaft
the cam part 2 is also displaced in the slot of the cam and the cam thereby
lengthened. The weights p¹ and levers på are held in equilibrium by springs p*.
The above described cam n (Figs. 4, 11, 12) serves to completely close the steam
port. When the sleeve o¹is displaced by the governor P against the cam 1, the
cam n at a certain point of the displacement passes by reason of the oblique
slots n³ (Fig. 11) engaged by pivots n (Figs. 6, 7) upwards out of the path. By
this movement of the cam n the lever m¹, m², is moved as the cam n strikes
against the lug m³ and presses it backward. In this movement of the lever m¹, m²
the rod F is pulled open at the joint of its two parts f, f, and the steam
slide thereby moved to close the steam port c.
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
claim is :-
-
1. A slide valve mechanism for rotary motors in which a cam 7 or its equivalent
fixed on the motor shaft and determining the steam admission, transmits through
jointed levers, motion to the slide valve, suddenly opens or closes the latter and
during the steam admission so holds it open that the steam is always delivered in
an unthrottled or nearly unthrottled state, substantially as described and shewn.
2. In a rotary motor the arrangement of the cam / or its equivalent carried on
the motor shaft and determining the steam admission, in the manner that by the
action of the governor the outer circular part of the same may be lengthened or
shortened for the purpose of increasing or diminishing the duration of the steam
admission, substantially as described and shewn.
3. In a rotary motor the arrangement of a cam part n which is actuated by the
governor when the load is taken off the motor so as to break the joint and open a
two part lever F in connection with the slide valve whereby the steam is completely
or nearly shut off, substantially as described and shewn.
4. In a slide valve mechanism of the kind referred to in Claim 1, a governor in
which the stroke occasioned by an increasing or diminishing speed is transmitted so
as to cause intermediate links to turn in a contrary direction in which governor the

page_text: weight carrying levers are in connection with the parts to be regulated by means of
pivots located at a distance from the motor shaft for the purpose of causing the
centrifugal force to operate upon a longer lever arm, substantially as described and
shewn.
5. In the slide valve mechanism referred to, the connection of the weighted levers
p2 of the governor with the sleeve o¹ by means of links in the manner that any
suitable length of travel may be communicated to said sleeve from the free ends of
the weighted levers, and said travel suspended, and thereby the whole of the centri-
fugal force communicated to the regulating mechanism, substantially as described
and shewn.
6. In the governor referred to, the arrangement of springs acting in opposition
to the centrifugal force in the manner that one end of said springs is attached to
the disc p and the other end to the weighted levers and upon every movement of
the weights tend to hold the same in equilibrium substantially as described and
shewn.
Dated this 4th day of Anril 1898
CAPITAINE & VON HERTLING,
89, Chancery Lane, London, W.C., Agent for the Applicant.