Year: 1888

page_text: We EMIL BOEHME and JULIUS PAULSEN both of the Iron Works Breslau in the
Empire of Germany Engineers do hereby declare the nature of the said 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 conical friction clutches for connecting or disconnecting
without shock parts of machinery while in motion.
The construction of the clutch is such that the power used for engaging or dis-
engaging it is furnished by the machine itself so that a small exertion on the part of
the operator is sufficient to effect the coupling and uncoupling.
In the arrangements shewn in Figures 1, 2, and 3 of the accompanying drawings
the engaging and disengaging of the parts of the clutch are effected by means of
conical friction clutches whilst in the arrangements shewn in Figures 4, 5; 6 and 7
the engaging and disengaging of the parts of the clutch are effected by means of
friction wheels.
Figure 1 shows an elevation of one half of the friction clutch. Figure 2 is a
longitudinal section and Figure 3 shows a modification wherein one part of the
clutch is provided with a pulley. The part a of the clutch is firmly connected to
the rotating part of the machine for instance to a shaft A as in Figures and 2
to a pulley A² as in Figure 3 or to a cog wheel a chain wheel, a rope pulley, or
the like whilst motion is conveyed to the part 6 by means of the friction clutch
this part 6 being secured to the other shaft B or the like to which motion is to
be transmitted. The engaging or disengaging of the clutch is effected by three or
more screws c the inclined heads t, of which engage with the undercut part as
shewn in such a manner, that they are free to slide on that projection when the
screws are not tightened so that motion is not transmitted from one part of the

page_text: clutch to the other but so that when the screws are tightened up the parts of the clutch
are secured together. The screws are tightened or slackened by means of pinions d
the bosses of which constitute the nuts for the said screws. The pinions d are all
actuated by a toothed wheel e loosely mounted on B so as to be capable of sliding
on it. The toothed wheel e may be held by the operator by means of a brake or
other equivalent device whilst the part together with the screws c and the pinions d
rotate or if 6 be stationary the wheel e may be turned by the operator so that a
secure engaging or disengaging of the two parts a and 6 of the clutch is effected
the power being furnished by the rotating parts. The clutch may be disengaged
in various ways for example, in the construction shown in Figures 1 to 3 the
bush is connected to a forked hand lever m the fulcrum of which is arranged
outside the rotating parts. The bush r is formed with a conical clutch part g which
may by means of the hand lever m be pressed against the coned disc secured to
the part on which the wheel e is formed or to which it is attached. The disc is fixed
to a disc i to which is also fixed the toothed wheel e. By operating the lever i so as
to force the part g against the part h the toothed wheel e and the parts to which it is
fixed are firmly held in position whilst the rest of the apparatus continues to rotate.
In this case the screws c are slackened and the parts a and bare disengaged. In
order to again cause the parts a and b to engage the disc i is forced by means of the
lever m and the bush against the rim k of the disc a thereby causing the part i and
the toothed wheel e to rotate and the pinions d to tighten up the screws c so that the
parts a and b are again firmly connected.
Figures 4 to 7 shew a modification of the means for operating the clutch to engage
and disengage its parts. Figures 4 and 5 shewing a simple shaft and Figure 6 a
pulley and Figure 7 a toothed wheel as the part from which the power is transmitted.
According to this modification the parts of the clutch are engaged and disengaged
in the following manner. A friction wheel f¹ provided with a groove is formed in
one with or affixed to the toothed wheel e which is attached to the bush g' loose on
the shaft A. The wheel f¹ is held in position by the brake block a connected to the
lever h¹. If now the friction wheel f¹ and thereby the toothed wheel e be prevented
from rotating while the rest of the apparatus continues to rotate the screws care
slackened and the parts a and b are disengaged the part b and shaft B eventually
stopping. The second friction wheel ¹ which has exactly the same diameter as that
of the wheel f¹ is firmly connected to the shaft A as in Figures 5 and 6 or to the
wheel A as in Figure 7 which continues to rotate after the clutch has been dis-
engaged. In order to engage the coupling a connection is established between the
wheels and f¹ when the toothed wheel e is actuated and with it the pinions d
thereby tightening the screws c and engaging the clutch. The connection between
the wheels and flis effected by a double friction wheel which is secured by the
bolt m (Figures 4 and 5) to the lever h¹. A clutch constructed in the manner
shown in Figures 4 to 7 is therefore disengaged by lowering the lever h¹ and engaged
by raising it.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is :-
1. A friction clutch having the parts thereof engaged and disengaged by screws
operated substantially as herein before described.
2. In clutches of the kind referred to the combination with the screws of conical
clutches or of friction wheels for actuating the screws substantially as hereinbefore.
described.
3. In friction clutches the combination with the parts of the clutch screws with
hooked shaped heads carried by the one part which engage with projections on the
other part so that the said heads either run free of the projections or grip them when
the screws are tightened by the rotation of the screw nuts substantially as herein before
described.

page_text: 4. The combination of parts constituting the friction clutch operated to engage
and disengage the parts substantially as herein before described and illustrated in
Figures 1, 2 and 3.
5. The combination of parts constituting the friction clutch operated to engage
and disengage the parts substantially as hereinbefore described and illustrated in
Figures 4 to 7.
Dated this 7th day of July 1888.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents.