A SAFETY OR SLIP CLUTCH OR CARRIER FOR TRANSMITTING HIGH REVOLVING SPEED ESPECIALLY APPLICABLE TO CENTRIFUGAL APPARATUS
Year: 1885

page_text: CONFLEIE
DIECIFICATION.
I, SVEN JONSSON of 18" Schönbergsgade Copenhagen, Denmark, Engineering
Draughtsman do hereby declare the nature of said Invention for "A SAFETY OR
SLIP CLUTCH OR CARRIER FOR TRANSMITTING HIGH REVOLVING SPEED ESPECIALLY
APPLICABLE TO CENTRIFUGAL APPARATUS " and in what manner the, same is to
be performed to be particularly described and ascertained in and by the following
statement:-
This self regulating safety carrier is intended for transmitting the motion of a
quickly rotating. machinery part to another rotatable machinery part in such
manner that the carrier lets slip the first named machinery part as soon as the last
named machinery part with which the carrier is fixedly connected obtains a speed
of rotation which exceeds a certain limit. Such a carrier is of great value in
many quickly revolving machines and specially for centrifugal extractors or other.
centrifugal appliances in order to ensure that the centrifugal vessel sball not
through accident, or ignorance or carelessness on the part of the attendants: or from
other reasons obtain so great a speed that there may be danger of bursting it, which
always takes the form of a very destructive explosion.
I shall describe as an example a self regulating carrier applied to the transmission
of the rotation of one strap pulley to another strap pulley.
:
In the accompanying drawings is, as an example, shown such a self regulating
carrier applied to the transmission of the rotation of a strap pulley to another strap
pulley.
Figure 1 shows a section of the whole apparatus vertically on the common shaft
of two strap pulleys on the line A A Figure 2 which latter is a longitudinal section
through the shaft on the line B B Figure 1.
The power transmitting and smaller strap pulley a and the power receiving and
larger strap pulley b are both arranged in the same shaft c the former pulley a
fixed and the latter bloose. The carrier consists of two arms g which are jointed
onto the same fulcrum pivot or on two separate pivots f which are fixed on the
larger or driven pulley. Each arm is formed with a toothed curved part h which
embraces a part of a prolongation rim of the driving pulley a, which prolongation
reaches into the hollow of the driven or larger pulley b. Below these two arms are

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connected by a bolt i passing loosely through the ends of the arms and provided
with an outer helical spring j under the head or under the nut of the bolt, so that
it presses the arms together and causes them to clamp the prolongation rim of a
and by the friction carries the larger pulley b along with the smaller driving
pulley a. But as soon as the speed of rotation of the latter reaches a certain limit,
the centrifugal force will cause the arms g, in spite of the pull of the spring j to
spread apart and let go the rim prolongation of the strap pulley a. As soon as the
speed of the strap pulley b becomes reduced again by the resistance of the
machinery parts which it moves, the arms g will again close round the rim pro-
longation of the pulley a so that the strap pulley b again receives power from the
strap pulley a and so on.
In order to hinder one of the arms g from overpowering the other when they are
about letting go the rim prolongation of a so that only one arm would fly out and
thus press the other one on, the two stops k are provided one on each side at a
distance from the arm in question not greater than that the arm has just let go the
rim prolongation when it comes against the stop. In order to increase the centri-
fugal force of the arms g, I strengthen the middle part of the arms as shown at h
so as to form solid lumps or blocks of sufficient weight. By means of the nut on
the bolt the tension of the spring j can be adjusted. d is a strap pulley running
loosely on the shaft for shifting the strap onto in the usual manner.
The described carrier may of course be modified in many ways without
alteration of the essence of the invention. A helical spring may thus for instance
be provided under the head as well as under the nut of the bolt i. The arms g
may be used singly instead of in pairs. If a single arm g is used, its end is
connected with a staple or eye fixed to the strap pulley b in the same manner as
the end of the other arm in Figures 1 and 2 viz: by a screw bolt and spring. Such
a construction is shown in Figure 3 where 2 is the staple or eye named. Or the
armis g may be omitted and the blocks has shown in Figure 4 be so applied to the
strap pulley b as to be able to slide radially. The blocks are here provided each
with a peg i which goes through a corresponding staple or eyez on the pulley b
and into an enlargement y on its rim so that the blocks h are sufficiently stayed,
and if required guided laterally between guide bars or pegs fixed to the inside of
the pulley b. The spring j for pressing the toothed block h against the rim pro-
longation is placed between a nut on a screwed part of the peg i and the
enlargement part y.
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
First A carrier for transmission of rotary motion from one machinery part to
another so arranged that its action is broken off by the centrifugal force as soon
as the speed of that machinery part to which the motion is transmitted passes
a certain limit as set forth.
Second-The construction of carriers as shown on the drawings.