IMPROVEMENTS IN AUTOMATIC EXPANSION GEARING FOR COLLIERY WINDING AND OTHER ENGINES
Year: 1878

page_text: LETTERS PATENT to John Daglish, of Tynemouth, in the County of North-
umberland, Mining Engineer, and Henry Lawrence, of the Grange Iron Works,
in the County of Durham, Mechanical Engineer, for the Invention of
"IMPROVEMENTS IN AUTOMATIC EXPANSION GEARING FOR COLLIERY WINDING
AND OTHER ENGINES."
Sealed the 14th March 1879, and dated the 27th September 1878.
:
PROVISIONAL SPECIFICATION left by the said John Daglish and Henry
Lawrence at the Office of the Commissioners of Patents on the 27th September
1878.
JOHN DAGLISH, of Tynemouth, in the County of Northumberland, Mining
Engineer, and HENRY LAWRENCE, of the Grange Iron Works, in the County of
Durham, Mechanical Engineer. "IMPROVEMENTS IN AUTOMATIC EXPANSION
GEARING FOR COLLIERY WINDING AND OTHER ENGINES."
Our Invention consists in arranging expansion gearing for colliery winding and
other engines, so that the duration of time or portion of the stroke that steam shall
be admitted into the engine cylinders may be varied either automatically or by the
engine attendant.
The manner in which the Invention may be carried into effect is as follows:-An
inclined block or sliding wedge is attached to each of the four valve levers of a
double cylinder colliery winding or other engine, and motion is given simultaneously
to each of these inclined blocks or sliding wedges by rods attached to levers keyed
to a weigh bar. This weigh bar receives its motion by a double-ended lever keyed
thereon, and to one end of this double lever is attached a rod passing to the governor,
and to the other end is attached a rod passing to the engine attendant, so that the
governor or the attendant can independently give simultaneous motion to the four
inclined blocks or sliding wedges. The angle or position of the lifter or tripping
lever is thereby altered, and thus the time of contact with the ordinary cam lever
or wiper, as the case may be, from which the valves receive their motion is limited
or regulated.
Although our Invention is intended more particularly for double engines it is also
applicable to single engines.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Daglish and Henry Lawrence in the Great Seal Patent Office
on the 24th March 1879.
JOHN DAGLISH, of Tynemouth, in the County of Northumberland, Mining
Engineer, and HENRY LAWRENCE, of the Grange Iron Works, in the County of
Durham, Mechanical Engineer. "IMPROVEMENTS IN AUTOMATIC EXPANSION
GEARING FOR COLLIERY WINDING AND OTHER ENGINES."
Our Invention consists in arranging expansion gearing for colliery winding and
other engines, so that the duration of time or portion of the stroke that steam shall
be admitted into the engine cylinders may be varied either automatically or by the
engine attendant. The manner in which we effect this is as follows:-
We attach to or place in connection with each of the steam valve levers of a
double or single cylinder colliery winding or other engine a movable block or sliding
wedge, and we give motion simultaneously to each of the movable blocks or sliding
wedges by rods attached to levers keyed to a weigh bar. This weigh bar receives
its motion by a double-ended lever keyed thereon, and to one end of this double
lever is attached a rod passing to a governor, and to the other end is attached a rod
passing to the engine attendant, so that the governor or the attendant can inde-
pendently give simultaneous motion to each of the movable blocks or sliding wedges.
The angle or position of the lifter or tripping portion of the steam valve lever is
thereby altered, and thus the time the said lifter or tripping portion of the steam
valve lever is in contact with the ordinary cam lever or wiper, as the case may be,
from which the steam valve or valves receive their motion is limited or regulated.
In order that our said Invention and the manner of performing the same may be
properly understood, we have annexed a Sheet of explanatory Drawings:-Figures 1
and 2 are elevations of two nozzles or valve chests attached to a steam cylinder;
A, A, are the steam valve spindles; B, B, are the exhaust valve spindles; C, C, are
the steam valve levers; D, D, are the sliding wedges or movable blocks which are
connected by rods and levers and adjusting screws to the arm E, which is keyed fast
on the weigh bar G; on this same weigh bar G is keyed at any convenient part the
double arm or lever H fitted at each end with swivel guide pieces; through these at
one end works the rod I leading to the governor, and at the other end the rod K
leading to the engine attendant; L, L, are the wipers, and M, M, are the lifters or
tripping portion of the steam valve levers, at the end of which is attached an
adjustable roller cased with india-rubber. Figures 3 and 4 are plans of the two
nozzles or valve chests shown in Figures 1 and 2.
When the gearing is in the position shown in the Drawing the engine can be
started with full steam; motion is then given by the engine attendant to the rod K
(in the direction indicated by the arrow thereon), by which the sliding wedges or
inovable blocks D, D, are worked in or out, and give the necessary amount of
expansion independent of the governor, but as soon as the engine arrives at the fixed
full speed the governor gives motion to the rod I in the direction indicated by the
arrow thereon, and thus regulates the position of the sliding wedges or movable
blocks D, D, and thereby the amount of expansion independent of the engine
attendant. Figure 5 shows an arrangement in which the lifter M and parts connected
therewith are somewhat different; this modification will be understood from the.
Figure without further explanation.
Having thus particularly described the nature of our said Invention, and the
manner in which the sanie is or may be performed, we declare that we claim,-
Arranging expansion gearing for colliery winding and other engines, substantially

page_text: in the manner and for the purpose herein-before described and represented in the
accompanying Drawing.
In witness whereof, I, the said Henry Lawrence, for myself and on behalf of the
said John Daglish, have hereunto set my hand and seal, this Twenty-second
day of March, One thousand eight hundred and seventy-nine.
THE T
HENRY LAWRENCE (LS.)