Improvements relating to Regulating Mechanism for Use in Connection with Intermediate Bolt Gear, Chief- Designod for Limiting the Speed of Centrifugal Apparatus.
Year: 1886

page_text: Improvements relating to Regulating Mechanism for Use in
Connection with Intermediate Bolt Gear, Chief- Designod
for Limiting the Speed of Centrifugal Apparatus.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of my invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention relates to an intermediate belt gearing which discontinues to
transmit the motion of a driving shaft to apparatus actuated therefrom when the
velocity of rotation has attained a certain limit.
This gearing is specially designed for use with centrifugal apparatus to prevent
the number of revolutions becoming greater than that which was assumed in
calculating its strength, so as to prevent accidents. The said intermediate gearing
can, however, be employed with other machines where any advantage may be
derived from the said function.
In the accompanying drawing.
Figure 1 is a front view of the improved gearing, and
Figure 2 is a side view of the same.
Similar letters of reference indicate corresponding parts in both Figures.
A is the shaft of the intermediate gearing, which is supported in the bearings B,
and which carries the three pulleys C, C and C³.
The pulley C which is fixed upon the said shaft is driven from the driving shaft
whilst the belt which transmits the motion from the intermediate gear to the
centrifugal or other apparatus runs upon the pulley C³. C' is a loose pulley.
At one end of the shaft A is arranged a centrifugal governor D, whose weighted
swinging arms have their fulcrums in firm connection with the shaft, whilst the
upper ends of the said arms act upon a rod E which is placed in a central bore in
the end of the shaft.
The rod E bears against one arm of an angle lever F which turns upon the
bolt G, whilst the other arm carries a counter weight H. To the counter weight H
is fixed a bell K, and an S-shaped horn J, the latter projecting below the retaining
pawl L. This pawl engages with a toothed segment N which is arranged at the
upper end of one arm of an angle lever O, the other arm of which carries a counter
weight P. This angle lever turns upon the bolt Q.
The belt shifter R for displacing the driving belt from the loose pulley C³ on
to the fast pulley C₁, and inversely, is connected by the bolt S (which latter
terminates in the projecting handle S¹) with the vertical arm of the lever O.
Price 611

page_text: As the rod E is acted upon by the counterweight H, the swinging weights of the
governor D are prevented from opening until the centrifugal force has increased
sufficiently to overcome the pressure exerted against the rod E. When the velocity
of rotation has reached this point, the rod E is forced outwards from the shaft and
the counterweight H is lifted, as the said rod E presses against the upper end of
the lever F. The horn J upon the counter weight H is thus caused to strike the
retaining pawl L and lift the same out of engagement with the toothed sector N.
The counter-weight P will then be able to drop and thereby move the upper end
of the angle lever O inwards, so that the belt-shifter, which is connected with the
same, moves the driving belt from the fast pulley C₁ onto the loose pulley C³,
whereby the communication of power from the driving shaft to the centrifugal or
other apparatus ceases.
When the weight H is thus lifted, the belt. K is raised enough for a projection
on the shaft A to strike against it, whereby the machinist is informed of the
disengagement.
As long as the number of rotations of the shaft A does not decrease below the
maximum to which the apparatus is adjusted, the several parts of the intermediate
gear remain in the disconnected position, but as soon as the velocity has diminished
below this limit, the counter weight H will be able to force the rod E backwards in
its support and consequently drop so that the retaining pawl can again engage
with the toothed segment N. By then pulling the handle S¹ the belt shifter R can
be drawn back so that the belt will run upon the fast pulley thereby again com-
municating motion to the centrifugal apparatus.
The narrower the portion of the belt running upon the fast pulley, the greater
the belt will be able to slip upon the said pulley, so that by placing the retaining
pawl L between the different teeth of the toothed segment N this slipping of the
belt can be correspondingly varied and thereby also the velocity of the rotation
which the centrifugal or other apparatus receives through the uniform rotation of
the shaft A. Accordingly by the same intermediate gear the communication of
power can be caused to cease with a greater or smaller number of revolutions of the
centrifugal apparatus.
It is obvious that I can modify various details of construction hereinbefore
described, without departing from the nature of my invention.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to
me by my foreign correspondent I declare that what I claim is
First. The combination with intermediate belt gear of regulating mechanism
whereby the belt is automatically shifted from the fast to the loose pulley when
the velocity of the apparatus being driven has reached a determined limit.
Second. The improved apparatus comprising a centrifugal governor D which
acts upon the rod E which latter, through the medium of a lever lifts the counter-
weight H and with it the horn J, which horn forces the retaining pawl L out of
engagement with the toothed segment N so that the counterweight P can by
means of the lever O force the belt-shifter R sideways, whereby the driving belt is
moved from the fast pulley C¹ to the loose pulley C2 substantially as described.
Dated the of Ontahan 100A
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.