MENT IN CENTRIFUGAL GOVERNORS
Year: 1885

page_text: I, RICHARD MUILMAN CHISWELL, of Southgate, Manchester, in the county of
Lancaster, Engineer, do hereby declare the nature of said invention for IMPROVE-
MENT IN CENTRIFUGAL GOVERNORS, a communication to me from abroad by the
firm of Schäffer and Budenberg, Engineers, of Buckau-Magdeburg, in the German
Empire, to be as follows:-
This invention relates to pendulous centrifugal governors provided with sliding
weights, and has for its object to construct in a small space a simple and energetic
governor with variable sensitiveness.
The improved governor chiefly comprises pendulous weights, preferably four in
number each of which forms an angle lever pivoted to the hollow sliding weight
and connected with the spindle by means of a spring in such a manner that the
attachment of the spring (to the spindle) constitutes the fixed point, while the
whole of the pendulum together with the sliding weight and muff is movable up
and down.
The said pendulous weights are arranged in pairs symmetrically to the spindle,
preferably two pairs at right angles to each other, one arm of the angle lever
forming the pendulum proper, while the other arm situated between the governor
spindle and the fulcrum of the pendulum may form an arc of a circle having its
centre in the fulcrum of the pendulous arm and serving as a guide for the spring,
the latter being attached with its lower end to the lower end of the said arc and
with its upper end to the spindle. The sliding weight, made in one piece with the
muff, has the shape of a casing or conoidal vessel made of two parts which encloses
the pivots and the horizontal arms of the pendulous angle-levers and allows the
lower ends of the latter with the ball-weights to protrude through slots at the base
of the casing.
The upper part of each spring is parallel with and close to the spindle and forms
a tangent to the arc at the horizontal arm of the angle lever.

page_text: For the outward motion of the pendulous arms the resistance of the springs
must be overcome, or the whole sliding muff and the angle levers must be lifted so
that by properly selecting the springs or rendering them adjustable, any desired
degree of stability may be obtained with the same governor.
Improvement in Centrifugal Governors.
I, RICHARD MUILMAN CHISWELL, of Southgate, Manchester, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention, a communi-
cation to me from abroad by the firm of Schäffer and Budenberg, Engineers, of
Buckau-Magdeburg, in the German Empire, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:
The present invention relates to pendulum governors provided with sliding
weight and springs.
In the accompanying drawing Fig. 1, is a vertical section of a governor
embodying the invention, while Fig. 2 is a plan after removal of the cover and
three of the four pendulous arms.
Each of the arms P, P¹ arranged symmetrically around the spindle S forms an
angular or one-sided pendulum suspended at one of the points K in such a manner,
that, when the governor is at rest, and therefore without centrifugal action, the
levers would (under the influence of their own weight) fly apart from their lowest
position shown by the drawing, until the pendulous weights P have nearly reached
the opposite end of their path, namely the position corresponding to the highest
position of the governor, if they were not held in the position shown, by the weight
of the muff A B and by the spring f. Consequently, the weight of the pendulous
arms cooperates with the centrifugal force, which acts. during the revolution of the
governor. The upper or inner arm P of each pendulous lever is rounded off by a
surface or curve, having its centre in the fulcrum K.
The cylindrical surfaces m n, thus formed, serve as a base, on which the
respective leaf spring f may be wound on and off. These springs are attached at
one end o to the upper part of the spindle S and at the opposite end to the
pendulous levers P, so that the flying apart of the pendulous weights or lower
arms P¹ lifts not only the whole of the pendulous levers, but also the combined
muff and casing, which holds and supports the angle levers P P¹ at their fulcra K

page_text: and encloses the greatest part of the said levers. During this motion the resist-
ance of the springs f, which increases with the angle of oscillation of the pendulous
levers, must be overcome, so that by a suitable selection of the springs any desired
degree of stability may be given to the governor.
Having now particularly described and ascertained the nature of this Inven-
tion, and in what manner the same is to be performed, I declare, that what
I claim, is
In centrifugal-governors, the combination of pendulous angle levers P Pi
suspended at an angle to their position of equilibrium (namely the position due to
their own weight), with springs f and spindle S, and with a combined fulcrum
support or pendulum carrier and sliding muff A B, the said parts being arranged
and connected in such a manner, that during the action of the governor the point
of attachment of the springs to the spindle remains stationary while the total
weight or mass of the pendulous arms and of the combined muff or sliding weight
and pendulum carrier moves up and down.