Improved Arrangement of Reversing Gear for Steam and other Engines.
Year: 1894

page_text: Date of Application, 20th July, 1894
Complete Specification Left, 8th Mar., 1895-Accepted, 11th May, 1895
PROVISIONAL SPECIFICATION.
Improved Arrangement of Reversing Gear for Steam and other
Engines.
JAMES HUTCHINSON MANN Mechanical Engineer and SIDNEY CHARLESWORTH
Mechanical Engineer trading as Mann & Charlesworth, Canning Works, Dewsbury
Road Leeds, do hereby declare the nature of this invention to be as follows:-
Instead of using ordinary link motion reversing gear, we employ the following
arrangement; which consists of a disc wheel or boss (which for convenience we
use as a governor pulley) keyed on to the crank shaft of the engine, on which are
attached two pins forming fulcrums for two levers or arms, one being a bell crank
lever. The eccentric is attached to the other ends of the levers or arms by pins,
and has a slot hole through it, allowing it to be moved across the crank shaft by
the bell crank lever to the backwards or forward positions as required (the levers
being of equal lengths insure the eccentric being kept perfectly at right angle to
the crank shaft & parallel to the centre line of the engine in any position). The
other end of the bell crank lever is connected by a die to a loose sleeve, which is
moved along the crank shaft by a hand lever working between notch plates for
holding it in the required position for causing the engine either to run backwards or
forwards, and also for varying the expansion of steam in the cylinder.
Dated this 19th day of July 1894.
v ed Arrangement of Reversing Gear for Steam and other
Engines.
We, JAMES HUTCHINSON MANN and SIDNEY CHARLESWORTH of Canning
Works Dewsbury Road Leeds in the County of York, Mechanical Engineers 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 :-
Instead of using ordinary link notion reversing gear, we employ the following
arrangement, which consists of a disc wheel or boss, (which for convenience we
use as a governor pulley), keyed on to the crank shaft of the engine; on which
are attached two pins, forming fulcrums for two levers or arms, one being a bell
crank lever. The eccentric is attached to the other ends of the levers or arms by
pins, and has a slot hole through it, allowing it to be moved across the crank shaft
by the bell crank lever to the backward or forward positions as required, the levers
being of equal length to ensure the eccentric being kept perfectly at right angles
to the crank shaft and parallel to the centre line of the engine in any position.
The other end of the bell crank lever is connected by a pin or stud to a loose
sleeve, which is moved along the crank shaft by a hand lever, working between**
notch plates, for holding it in the required position for causing the engine either to
run backwards or forwards, and also for varying the expansion of steam in the
[Pain Qd"

page_text: cylinder. The advantages of our invention are greater simplicity, fewer parts
and reduced cost.
And in order that our invention and the manner in which the same is to be
performed may be more readily understood, we have annexed hereto the
accompanying sheet of drawings; in which Fig. 1 is a side elevation of a reversing
gear constructed in accordance with our invention, Fig. 2 is an elevation, transverse
to the shaft, of the above mentioned disc wheel or boss as seen from the left hand
side of Fig. 1, and Fig. 3 is a transverse elevation of the eccentric also viewed
from the left hand side of Fig. 1.
In all the figures the same reference.letter refers to the same or corresponding
part.
a indicates the shaft of the engine on which the reversing gear is mounted,
usually the crank shaft. is the disc wheel or boss firmly keyed to the shaft a,
and in such a position that the line A B Fig. 2 indicates the position of the crank.
Four lugs c carry two pins dd, which form fulcrums for the levers e and ff', the
latter being a bell crank lever, having a forked arm f¹ embracing the shaft a..
The eccentric is attached to the ends of the levers e and ƒ, by means of the pins h
carried in lugs i formed on the eccentric, g. The body of the eccentric is provided
with a slot hole, through which the shaft a passes, so that the eccentric can be moved
across the crank shaft a; the centre of the eccentric ( Fig. 3) moving along the
line mn between the extreme forward position m and the extreme backward
position n. The fork armis connected by means of the pins or studs k to the
sleeve, which is mounted loose on the shaft a. P is the reversing lever, which
may be fitted in connection with a notch quadrant for holding the reversing lever
in any desired position.
It will be evident from Fig. 3, that our improved reversing gear has the
advantage over ordinary link motion reversing gear, in that the lead of the valve
remains the same for any position of the reversing handle, so that a better
distribution of the steam when working expansively is obtained with our gear than
with the ordinary link motion gear.
It will also be evident that the nature of our said invention is not altered if the
pins are connected by any other means to the shaft, provided they are fixed
relatively to the sbaft and parallel or approximately parallel to each other. Also
the eccentric g may be made without slot hole if carried just beyond the end of
the shaft.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is―
1. A reversing gear comprising a slotted eccentric carried by parallel motion
hinged levers, said levers being carried on hinges fixed relatively to the shaft,
substantially as set forth.
2. A reversing gear consisting of a boss or disc wheel or other connection
keyed or otherwise fixed to or forming part of the engine shaft a, an eccentric g
carried by means of levers e and f of equal lengths hinged to the boss or wheel
parallel to each other, one of said levers being a bell crank lever ft, a sleeve l
loose on the shaft and capable of being moved longitudinally on the shaft by means
of a reversing lever or other equivalent mechanism or connected to the governor,
whereby the eccentric is moved to and fro transversely to the shaft to the
backward or forward positions.
3. Our improved reversing gear substantially as herein set forth and illustrated
in the accompanying drawings.
Dated this Savanth dow of 1905
J. CLARK JEFFERSON,
2, East Parade, Leeds, Agent for Applicants.