Improved Shaft Clutch Coupling, also applicable for a Brake..
Year: 1893

page_text: Date of Application, 23rd Oct., 1893
Complete Specification Left, 21st May, 1894-Accepted, 23rd June, 1894
PROVISIONAL SPECIFICATION.
Improved Shaft Clutch Coupling, also applicable for a Brake..
I, JEAN PAUL SCHMIDT of 6 Charitéstrasse, Berlin in the Empire of
Germany, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object a frictional coupling which serves for connecting
two shafts whether they are in a vertical or any other position, and which renders
it possible for the shafts to be connected without a shock even whilst they are
rotating; at the same time bringing both shafts in line with each other. The
possibility is also afforded of allowing the two shafts to run at different speeds without
disengaging the coupling, according to the degree of axial pressure which exists
between the two shafts. In one form of construction, the coupling may, however,
also be employed as a brake for blocks and pulleys to prevent backward travel of
the carrying shaft which is exposed to axial pressure.
On the accompanying drawing,
Figure 1 shows a form of construction as a shaft coupling; and
Figures 2 and 3 represent the arrangement as a brake for lifting apparatus;
Figure 4 shows a disc which will be hereinafter more particularly explained.
A hollow cylindrical extension a' a' is firmly connected or forms a part with the
shaft a, Figure 1, whilst the shaft 6 carries a fixed disc b', also a disc c and sleeve o³
prevented from revolving by means of the spring but capable of adjustment.
The part of the shaft 6 which extends beyond b' is inserted in a sleeve forming
part of the shaft a and the latter at its other end rests in a bush e on conver
surfaces, which bush may also run in a fixed bearing on convex surfaces. Ordinarily,
slipping takes place between the shaft a and box e, and only when these bearings
become worn, does slipping between e and i take place. x and y are bearings for
the shaft.
The disc c which is adjustable on the shaft 63 has two wedge shaped projections c¹,
which serve to press the two semi-cylindrical friction cheeks d against the wall of
the hollow cylinder a' after the disc c has come to bear against the surface a³ in
case of axial pressure being exerted on these friction cheeks by means of the
disc b'. Friction thus results between the discs c and a' as well as between the
semi-cylinder cheeks d and hollow cylinder a².
The friction will of course vary in amount according to the degree of the strain
on the shaft either through its own weight or from other causes. The friction may be
further increased by inserting between c and a³ a substance such as leather. This
insertion would also serve for entirely preventing any shock when the coupling
takes place.
Figures 2 and 3 show how this coupling may also be used as a brake for a lifting
apparatus, and in this case the shaft a is much shorter and is in the form of a
hollow bush a whilst the convex bearing surfaces remain similar to the bearings in
Figure 1. The hollow cylindrical part a has teeth h on its periphery in conbination
with a pawl g attached to the case of the block and pulley, only permitting the
part a to revolve in the direction of the arrow 2, whilst, when the rotation is in
the direction of the arrow, the friction which results between the friction
surfaces of the coupling must be overcome. The braking thus takes place only in
one direction.
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page_text: COMPLETE SPECIFICATION.
Improved Shaft Clutch Coupling, also applicable for a Brake.
I, JEAN PAUL SCHMIDT of 6 Charitéstrasse, Berlin in the Empire of
Germany, Civil 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 the following statement :-
This invention has for its object a frictional coupling which serves for connecting
two shafts whether they are in a vertical or any other position, and which renders: it
possible for the shafts to be connected without a shock even whilst they are
rotating; at the same time bringing both shafts in line with each other. The
possibility is also afforded of allowing the two shafts to run at different speeds
without disengaging the coupling, according to the degree of axial pressure which 1
exists between the two shafts. In one form of construction, the coupling may,
however, also be employed as a brake for blocks and pulleys to prevent backward
travel of the carrying shaft which is exposed to axial pressure.
On the drawing accompanying the Provisional Specification,
Figure 1 shows a form of construction as a shaft coupling; and
Figures 2 and 3 represent the arrangement as a brake for lifting apparatus ;
Figure 4 shows a disc which will be hereinafter more particularly explained.
A hollow cylindrical extension a' a' is firmly connected or forms a part with the
shaft a, Figure 1, whilst the shaft 6 carries a fixed disc b', also a disc c and sleeve c*
prevented from revolving by means of the spline or pin ƒ but capable of longitudinal ?
motion.
The part 6 of the shaft b which extends beyond 6' is inserted in a sleeve forming
part of the shaft a and the latter at its other end rests in a bush e on convex
surfaces, which bush may also run in a fixed bearing on convex surfaces. Ordinarily,
slipping takes place between the shaft a and box e, and only when these bearings
become worn, does slipping between e and i take place. x and y are bearings for
the shaft.
The disc c which is axially movable on the shaft 6 has two wedge shaped
projections c', which serve to press the two semi-cylindrical friction cheeks d
against the wall of the hollow cylinder a' after the disc c has come to bear against
the surface a³ in case of axial pressure being exerted on these friction cheeks by
means of the disc . Friction thus results between the discs c and a' as well as
between the semi-cylinder cheeks d and hollow cylinder a'.
The friction will of course vary in amount according to the degree of the strain
on the shaft, either through its own weight or from other causes. The friction:
may be further increased by inserting between c and a³ a substance such as leather.
This insertion would also serve for entirely preventing any shock when the coupling
takes place.
Figures 2 and 3 show how this coupling may also be used as a brake for a lifting
apparatus and in this case the shaft a is much shorter and is in the form of a
hollow bush a', whilst the convex bearing surfaces remain similar to the bearings
in Figure 1. The hollow cylindrical part a' has teeth h on its periphery in
combination with a pawl g attached to the case of the block and pulley, only
permitting the part a¹ to revolve in the direction of the arrow 2', whilst, when the
rotation is in the direction of the arrow, the friction which results between the
triction surfaces of the coupling must be overcome. The braking thus takes place
only in one direction.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A frictional coupling for connecting shafts characterised by the disc c which

page_text: is axially movable on one of the shafts coming into frictional contact with the
fixed disc a' of the other shaft, whilst at the same time wedge pieces o, arranged on
the first named disc, press two semi-cylindrical friction cheeks or blocks d against.
the surface of the hollow cylinder a¹ of the second shaft as soon as any axial
pressure between the two shafts takes place by means of a fixed disc connected with
the first shaft, substantially as described.
2. In combination with the friction coupling described in Claim 1, a brake for
raising apparatus characterised by the hollow cylindrical part of the coupling being
inserted in a guide bush of the casing of the raising apparatus, a frictionless-
rotation in either direction being prevented by means of a circular rack arranged
on the outside of the hollow cylindrical part of the coupling, and a fixed pawl.
3. A frictional coupling or brake for raising apparatus of the kind described in
Claims and 2 in which the bearing or support of the axially unadjustable part of
the coupling is a guide bush having a convex surface running on a fixed convex
disc or pivot.
Dated this 19th day of May 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.