Improvements in the Method of and in Apparatus for Varying the Speed of Gas Exhausters and the like.
Year: 1897

page_text: Date of Application, 25th May, 1897
Complete Specification Left, 24th Feb., 1898-Accepted, 26th Mar.,
1898
PROVISIONAL SPECIFICATION.
Improvements in the Method of and in Apparatus for Varying the
Speed of Gas Exhausters and the like.
We, MATTHEW DUNN, of the Gas Works, Selby, Engineer and Manager, and
WILSON JOHN MOTT, Athol Mount, Ovenden, Halifax, Engineer, both in the
County of York, do hereby declare the nature of this invention to be as follows:-
The object of our invention is by an arrangement of mechanism (which is
simple, positive in action, comparatively inexpensive, and easy of application)
to vary the speed of machinery especially gas exhausters, compressors and the
like so that they are automatically operated at any intermediate rate of speed
between the initial maximum and initial minimum velocities.
As supplied to gas exhausters the speed of which is required to be regulated
according to the quantity of gas produced, the said quantity of gas per ton of
coal, and its illuminating power is regulated by the speed or pull of the
exhauster.
We employ a driving pulley revolving freely on a shaft or spindle (which
operates the exhauster). Upon this pulley is a bevel or mitre wheel pivotted in a
suitable bearing upon the arm of the said pulley and in gear with two mitre wheels
upon two shafts or spindles whose axes are at right angles to the axis of the first
bevel wheel, the mitre wheel at one side is fixed to its spindle which passes through
the driving pulley and also part way through the bevel wheel boss upon which is
keyed the fly and brake wheel, both being upon a second shaft carried in a suitable
bearing or pedestal, the two shafts meet in the boss of the bevel wheel carrying the
brake wheel and are independant of each other.
A band brake is arranged partially around the lower side of the brake pulley
and a brake lever carried in a suitable bracket is connected to one end of the band
brake, the other end of brake is carried by a fixed bracket, the method of varying
the speed may be accomplished in many ways.
On the brake lever are weights, from the brake lever is passed a chain, the said
chain passing over guide pulleys to the ordinary governor bell, which is generally
near the exhauster.
The action is as follows: The motor or other power employed to drive the
exhauster is connected in the ordinary way by belt to the driving pulley; suppose
the exhauster shaft is still, and that the driving pulley is revolving on it, the bevel
wheel on the driving pulley gears with the bevel wheel which is still and so revolves
imparting motion to the opposite bevel wheel upon which is
the brake wheel, when it is required to start the exhauster
shaft the weights are applied to the brake lever producing a load on the
brake wheel greater than that opposed to it by the exhauster and so causes the same
to revolve.
The variation of speed of the exhauster is automatically regulated by the pull
of the governor bell through the cord or chain increasing or decreasing the weight
on the lever and load on the brake wheel as the governor rises or falls, due to the
varying production of the quantity of gas; the apparatus may be worked different

page_text: ways, power may be applied to one shaft and taken from the other, the variation in
speed between the two shafts being corrected by the brake.
Power may be applied to the pulley and taken from either of the two shafts in
which case a brake drum will be fixed on one of the shafts and variation in speed
similarly varied, or power may be applied to one shaft and taken from the central
pulley or drum and the variations of speed corrected by a brake applied to a drum
fixed on the other shaft.
D
T
Improvements in the Method of and in Apparatus for Varying the
Speed of Gas Exhausters and the like.
We, MATTHEW DUNN, of the Gas Works, Selby, Engineer and Manager, and
WILSON JOHN MOTT, Athol Mount, Ovenden, Halifax, Engineer, both in the
County of York, 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:-
-
The object of our invention is by an arrangement of mechanism (which is
simple, positive in action, comparatively inexpensive, and easy of application)
to vary the speed of machinery especially gas exhausters, compressors and the
like so that they are automatically operated at any intermediate rate of speed
between the initial maximun and initial minimum velocities.
As applied to gas exhausters the speed of which is required to be regulated
according to the quantity of gas produced, the said quantity of gas per ton of
coal and its illuminating power is regulated by the speed or pull of the
exhauster.
DESCRIPTION OF DRAWINGS.
Fig. 1, is a sectional front view of the mechanism employed in varying the speed
of gas exhausters and the like.
Fig. 2, is a side view of Fig. 1.
Fig. 3, is an end view of driving pulley employed in our improved method of
and apparatus for varying the speed of gas exhausters and the like.
Fig. 4, is a sectional front view of a modification of Fig. 1.
Fig. 5, is another modification of means employed in varying the speed of gas
exhausters and the like.
We employ a driving pulley A see Figs. 1 and 2, revolving freely on a shaft or
spindle B, (which operates the exhauster) upon this pulley A is a bevel or mitre
wheel C, pivotted in a suitable bearing D upon the armi E of the said pulley, and in
gear with two mitre wheels F, G, upon the shafts or spindles,
that is, upon the exhauster shaft B, and a second auxiliary
shaft H, whose axes are at right angles to the axis of the first bevel wheel C,, the
mitre wheel G at one side is fixed to the spindle or exhauster shaft B, which passes
through the driving pulley A and also part way through the boss of the bevel
wheel F, upon which is keyed the fly or brake wheel J, the brake wheel and bevel
wheel being upon a second or auxiliary shaft H carried in a suitable bearing or
pedestal K, the two shafts meet in the boss of the bevel wheel carrying the brake
wheel and are independent of each other,

page_text: A band brake L is arranged partially around the lower side of the brake pulley
or wheel, and a brake lever M carried in a suitable bracket N is connected to one
end of the band brake, the other end of the brake is carried by a fixed bracket P,
and is adjustable by means of nut and screw P¹, for varying, adjusting, or regulating
the contact of the brake with the brake wheel.
On the brake lever M are weights R.
From the brake lever is passed a chain or cord S, the said chain or cord passing
over guide pulleys to the ordinary governor bell which is generally near the
exhauster.
The action is as follows:-The motor or other power employed to drive the
exhauster is connected in the ordinary way by belt to the driving pulley A; sunnose
the exhauster shaft is still and that the driving pulley A is revolving on it, the
bevel wheel C on the driving pulley gears with the bevel wheel G which is still,
and so revolves, imparting motion to the opposite bevel wheel F upon which is the
brake wheel, when it is required to start the exhauster shaft, the weights are
applied to the brake lever producing a load on the brake wheel greater than that
opposed to it by the exhauster, and so causes the same to revolve.
The variation of speed of the exhauster is automatically regulated by the pull
of the governor bell through the cord or chains increasing or decreasing the weight
on the lever M, and load on the brake wheel J or its equivalent, as the governor rises
ог falls, due to the varying production of the quantity of gas;
such load or resistance may be applied to the brake wheel or its
equivalent by means of an air pump, a dynamo, or by any other suitable method
or apparatus operated by the governor bell, but we prefer the method shown and
described as being the simplest and most positive means for the aforesaid purpose.
We may dispense with the auxiliary shaft and extend and turn down the
exhauster shaft at H see Fig. 4, and in place of keying the brake wheel J upon the
boss of bevel wheel F, we prefer to attach the same by bolts, also we. preferably
attach balance weights W upon one of the driving pulley arms, so as to counteract
the effect of and balance the mitre wheel upon the pulley ari E.
Or, see Fig. 5, we may fix the brake wheel J or its equivalent and driving
pulley A upon the second or auxiliary shaft H, the driving pulley revolving loose
as before described and at one end of this shaft we mount a suitable spur or gear
wheel T, gearing with a second gear wheel U operated by the driving pulley A,
the gear wheel U is mounted upon a suitable arm V upon the exhauster shaft, in
this case, when the brake put upon the brake wheel is greater than the resistance
of the exhauster shaft, the auxiliary shaft is stopped, and the driving pulley by
means of the gear wheels T and U and arm V, operate the exhauster shaft B and
shaft H, for the purposes as before described.
Power may be applied to one shaft and taken from the other, the variation in
speed between the two shafts being curiated by the brake.
Power may be applied to the pulley and taken from either of the two shafts in
which case a brake drum will be fixed on one of the shafts and variations in speed
similarly varied, or power may be applied to one shaft and taken from the central
pulley or drum and the variations of speed corrected by a brake applied to a drum
fixed on the other shaft.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we would have it understood
that we do not claim any particular method of or apparatus for applying resistance
to the brake wheel or its equivalent, but we declare that what we claim is :-
1. Automatically regulating or varying the speed of gas exhausters, com-
pressors, or the like according to the quantity of gas or the like being produced,
by braking or resisting the motion of the brake wheel or its equivalent, according
to the pull of the governor bell as the governor rises or falls, substantially as set
forth.
2. In automatically regulating or varying the speed of gas exhausters, com-

page_text: pressors or the like, the use and employment of pulley A, bevel wheels C, F and G,
shaft H, brake wheel J, brake L, lever M, weights R, and cord S, operating in the
manner and for the purposes substantially as set forth.
3. In automatically regulating or varying the speed of gas exhausters, compressors
or the like, the use and employment of pulley A, bevel wheels C, F and G balance
weight W, brake wheel J, brake L, lever M, weights R and cord S operating in the
manner and for the purposes substantially as set forth.
4. In automatically regulating or varying the speed of gas exhausters, com-
pressors, or the like, the use and employment of pulley A gearing with gear wheel U,
upon an arm V, attached to the exhauster shaft B, gear wheel T upon shaft H,
brake wheel J and brake L, operating in the manner and for the purposes
substantially as shown and described.
D1 L
m
1 1
JOHN E. WALSH,
Waterhouse Chambers, Crossley Street, Halifax,
Patent Agent for the Applicants.