An Improved Device for Imparting Different Speeds to Rotating Parts of Machinery.
Year: 1899

page_text: Date of Application, 9th Sept., 1899-Accepted, 21st Oct., 1899
COMPLETE SPECIFICATION.
An Improved Device for Imparting Different Speeds to Rotating
Parts of Machinery.
I, GUSTAF ADOLF RYD, of Nya Aktiebolaget Atlas, Stockholm, in the Kingdom
f Sweden, do hereby declare the nature of this invention and in what manner
he same is to be performed; to be particularly described and ascertained in
and by the following statement; -
This invention relates to a device by means of which one part of a machine
rotating at a constant speed is enabled to impart rotary motion with variable
speed to another part.
In the accompanying drawing
Figures 1 and show, in a vertical longitudinal section, and cross section
respectively how the motion of a rotary pulley, running at a constant speed, is
transmitted to a shaft; and
Figures 3 and 4 are similar views showing how the motion of a uniformly
rotating shaft is transmitted to another shaft in a similar manner.
In the arrangement shown in Figure 1 the pulley a is fast on the hub of the
A fixed ring n limits the
friction disc b which latter is loose on the shaft c.
endwise movement of the disc.
Upon the shaft ca second friction-disc d is keyed at a certain distance from the
friction-disc b. Between these two friction-discs is placed a frame or ring e
The rings thus com-
mounted with capability of rotation upon another ring f.
bined together are placed at an angle between the discs b and d in such a manner
that the projecting sides of the ring f lean one against the disc b and the other
against the disc d. When the disc b rotates it causes the ring f to rotate within
The ring then communicates its rotary motion to the
the stationary frame e.
disc d which causes the shaft c to revolve.
The frame e with its friction ring f may be adjusted and held in position
between the discs b and d by any appropriate contrivance such as a screw or the
like. When the ring is in the position shown at Figure 1 it will be obvious
that the shaft c must revolve slower than the pulley a owing to the point of
contact between the ring f and disc being nearer the centre than that of the
ring and the disc d. The speed of the shaft must therefore increase in proportion
as this latter point of contact approaches the shaft and the former recedes there-
from. When the centre of the ring f coincides with the centre of the shaft
the speeds of the shaft c and the pulley a become uniform.
The device herein before described may also usefully serve as a coupling but
in such case the frame e must not only be movable endwise as herein before
described but it must be adapted to be moved sidewise in such a manner as to
interrupt the contact between the sides of the ring f and the two discs and d
respectively in order to uncouple the mechanism. With this coupling it wil
be possible, before coupling-up, to determine the speed which it is desired to
0 impart to the driven mechanism.
In the arrangement shown in Figures 3 and 4 the friction-discs b and d are

page_text: fixed on the extremities of the shafts y and h of which shaft the one g for example
revolves with a uniform speed. The ring-coupling is here replaced by two
discs and fast upon a common spindle i carried in a sleeve-bearing m which,
like the frame e Figure 1, is adapted to be moved to and fro between the friction
discs.
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:-
A device serving to transmit the uniform speed of a revolving part of a
machine at a variable speed to another part, and which consists of a rotary ring f
(or k, l) mounted between friction discs b and d fast upon the rotary parts a
and c (or g and h) and set at such an angle to the discs 6 and d that one side is
in contact with a point on the disc band the other in contact at a point diametri-
cally opposite to it, with the disc d, said ring being adapted to be moved to and
fro between the friction-dises with the object of approaching or removing the
contact-points towards or from the centre of the shaft and so adjust the speed
of the driven parts.
Dated this 9th day of Santambar 1800.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.