Improvements in Centrifugal Governors.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Centrifugal Governors.
I, WILHELM PROELL, of 1311, Rabenerstrasse, Dresden, Saxony, German Empire,
Engineer, do hereby declare the nature of this invention to be as follows:-
In the governor of the inverted suspension type described in the Specification
of Patent No. 4581 of 1886, the usual arrangement of a weight acting upon the
sleeve is replaced by the use of one or more springs which have a tendency to
cause rotation of the upper suspension arms or hanging straps about their points
of suspension and which balance the centrifugal force of the masses; also the centre
of the mass of the pendulum is compelled whilst rotating to move exactly or very
approximately in a plane situated at right angles to the axis of rotation. More-
over in the construction of that governor the upper hanging straps are connected
together by means of a helically coiled spring, or the ends of straps pivotally
suspended from the governor spindle act upon a helical spring coiled around said
spindle.
Now in a centrifugal governor constructed according to the present invention
the aforesaid coiled springs are replaced by the use of leaf or plate springs which
are composed of strips of steel, and are arranged parallel with the axis of the
governor spindle and which through the medium of straps and links balance or
take up the centrifugal force produced in the joints with the object of reducing
to a minimum the pressures upon the pins of the several joints of the governor, and
at the same time increasing the sensitiveness of the governor.
The use of two pairs of leaf springs arranged parallel with the axis of the
governor spindle, has the advantage that the inverted suspension of the balls
which move compulsorily in a plane at right angles to the spindle, is retained
exactly as in the arrangement of governor described in the aforesaid Specification
No. 4581 of 1886, whilst the bent levers, necessary in the said arrangement may
be dispensed with. By this means the injurious pin pressure at the points of
suspension is almost wholly obviated, and, as experiments have shown, the
sensitiveness is considerably greater (about 6 to 8 times greater) than in governors
of former types.
Furthermore by the arrangement of leaf springs a very favorable approxima-
tion to astasis is obtained, for which reason a governor constructed according to
the present invention may be justly termed a pseudo-astatic governor.
For the purpose of obviating heavily loaded pins as necessitated by every bent
lever, the centrifugal force of the governor balls is taken up at the joints which are
situated outside of the centre line of the pendulums. This taking up is effected
by means of two pairs of leaf springs which are composed of steel strips and are
parallel with the governor spindle. These leaf springs (each of which may be
fixed at its upper end by two screw bolts) allow of a comparatively large deflection
with the result that the pins from which the straps are suspended, are almost
wholly relieved of load, and the sensitiveness of the governor is greatly increased.
ID 877

page_text: In order to completely balance the pressures at the links, two of them have a
common joint bolt so that jamming of the governor is practically impossible.
Doted this 2nd day of November 1897.
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.
Improvements in Centrifugal Governors.
1, WILHELM PROELL, of 1311, Rabenerstrasse, Dresden, Saxony, German Empire,
Engineer, 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 1
the following statement:-
In the governor of the inverted suspension type described in the Specification
of Patent No. 4581 of 1886, the usual arrangement of a weight acting upon the
sleeve is replaced by the use of one or more springs which have a tendency to
cause rotation of the upper suspension arms or hanging straps about their points
of suspension and which balance the centrifugal force of the masses; also the centre
of the mass of the pendulum is compelled whilst rotating to move exactly or very
approximately in a plane situated at right angles to the axis of rotation. More-
over in the construction of that governor the upper hanging straps are connected
together by means of a helically coiled spring, or the ends of straps pivotally
suspended from the governor spindle act upon a helical spring coiled around said
spindle.
Now in a centrifugal governor constructed according to the present invention
the aforesaid coiled springs are replaced by the use of leaf or plate springs which
are composed of strips of steel, and are arranged parallel with the axis of the
governor spindle and which through the medium of straps and links balance or
take up the centrifugal force produced in the joints with the object of reducing
to a minimum the pressures upon the pins of the several joints of the governor, and
at the same time increasing the sensitiveness of the governor.
The use of two pairs of leaf springs arranged parallel with the axis of the
governor spindle, has the advantage that the inverted suspension of the balls
which move compulsorily in a plane at right angles to the spindle, is retained
exactly as in the arrangement of governor described in the aforesaid Specification
No. 4581 of 1886, whilst the bent levers, necessary in the said arrangement may
be dispensed with. By this means the injurious pin pressure at the points of
suspension is almost wholly obviated, and, as experiments have shown, the
sensitiveness is considerably greater (about 6 to 8 times greater) than in governors
of former types.
Furthermore by the arrangement of leaf springs a very favorable approxima-
tion to astasis is obtained, for which reason a governor constructed according to
the present invention may be justly termed a pseudo-astatic governor.
In the accompanying drawings:
Figure 1 is a side elevation partly in section, and
Figure 2 is an end elevation of a governor constructed according to the present
invention.
Figure 3 is a cross section on the line 3-3 of Figure 2.
In this arrangement for the purpose of obviating heavily loaded pins as necessi
tated by every bent lever, the centrifugal force of the governor balls a is taken up
at the joints c which are situated outside of the centre line of the pendulums b
This taking up is effected by means of two pairs of leaf springs e e¹ which are com

page_text: posed of steel strips and are arranged parallel with the governor spindle d. These
leaf springs (each of which is fixed at its upper end by two screw bolts) allow of
a comparatively large deflection with the result that the pins f from which the arms
or straps are suspended, are almost wholly relieved of load, and the sensitive-
ness of the governor is greatly increased.
In order to completely balance the pressures at the joints c of the links h, two of
them have a cominon joint bolt h¹ so that jamming of the governor is practically
impossible.
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. In a centrifugal governor with inverted suspension, in which the balls or
centrifugal masses move compulsorily in a plane at right angles to the spindle,
two pairs of leaf springs arranged parallel to the governor spindle, and which
through the medium of the upper suspension arms or straps, and of links balance
the centrifugal force occurring in the joints c, whereby the pin friction is reduced
and the sensitiveness of the governor increased, substantially as described.
2. The improved construction of governor, substantially as described and shown
in the accompanying drawings.
1000
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.