Couplings for Propeller or other Shafts.
Year: 1890

page_text: Date of Application, 27th Feb., 1890
Complete Speci cation Left, 5th July, 1890-Accepted, 16th Aug., 1890
PROVISIONAL SPECIFICATION.
Couplings for Propeller or other Shafts.
I RUDOLF BERGGREN of 1741 G Street Washington District of Columbia United
States of America Civil Engineer do hereby declare the nature of this invention to
be as follows:-
According to my present improvement I construct a coupling for propeller or for
any other driving shafts, hollow or solid, where this improvement can be advan-
tageously applied as I will proceed to describe.
The coupling is for a propeller shaft and is constructed so as to let the coupling
dise fitted to the proper propeller shaft take up the thrust, directly in the forward
motion of the boat and by means of a screw in the astern motion and transmit it,
through thrust shaft to thrust block.
The coupling disc is for this purpose (i.e. to take up the thrust of the astern motion)
provided with an inside flange or bottom with a hole for screw. The disc is secured
to the shaft by means of feather keys driven in from the face, and in order to effect
this, there are holes in the coupling disc large and deep enough to admit insertion of
said feather keys after the coupling dise has been fitted on the shaft.
What I in this construction for couplings for shafts do claim as a novel feature
and improvement and to which I desire to secure a right by Letters Patent for the
United Kingdom is-
1st. The construction of a coupling disc with an inside flange or bottom bearing on
the end of shafting and firmly secured against longitudinal displacement relative to
shaft by one or more screw bolts or by any elongation of the shaft passing through
hole in the bottom.
2nd. The insertion of the keys which transmit torsional strains from coupling diso
to the shaft, through openings in the face of said coupling disc, when the same is
already in its place on the shaft.
RUDOLF BERGGREN,
Inventor.
Authorized Agent for the above Rudolf Berggren,
for the United Kingdom of Great Britain and Ireland,
Peter W. Masson, 11, South Road, Erith, Kent.
COMPLETE SPECIFICATION.
Couplings for Propeller or other Shafts.
I RUDOLF BERGGREN of 1741 G Street Washington District of Columbia, United
States of America 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 :-
According to my improvement I construct a coupling for propeller or for any other
driving shafts, hollow, or solid, where this improvement can be advantageously
applied, and which 1 will now proceed to describe with reference to the accompanying
drawing.
Fig. 1. is a longitudinal section of the coupling on a hollow shaft, and Fig. 2 is a
side view of the coupling disc, which coupling disc is the main feature of my
improvement.
The coupling which is shown on the accompanying drawing is for a propeller shaft
and is constructed so as to let the coupling disc A which is fitted to the propeller
shaft P. S. transmit directly to the thrust shaft T. S, the thrust due to forward or

page_text: ahead motion of the boat. The thrust due to the backward or astern motion of the
boat is transmitted through the bolt B. to the internal flange f. of the coupling A.
and thence through the ordinary coupling bolts 1. b. to the thrust shaft T. S.
The construction of the said coupling disc A is as follows. It is (the coupling
disc) provided with an internal flange or bottom which flange or bottom is a solid
part of the said coupling disc. Through the aforesaid flange or bottom f. there is a
hole, through which passes the bolt B. This bolt B. is screwed into the shaft 1. S.
and by means of a nut or nuts, a cotter or cotters or any other means secures the
coupling disc A. to the shaft P. S. so that the bottom of the internal flange f. is hard
up against the end of the shaft P. S.
The torsional strain is transmitted from the coupling disc A to the shaft P. S. by
means of one or more feather keys k. k, which feather keys are driven from the
outside of the said coupling disc. In order that this may be effectel (i.e. the keys
driven from the outside of the disc A) there are one or more holes corresponding to
the number of keys used, large and deep enough to admit of the insertion of the
said keys k. k.
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.―
1st. The construction of a coupling disc with an internal flange or bottom bearing
on the end of the shafting and firmly secured against longitudinal displacement
relative to the shaft, by one or more screw bolts or by an elongation of the shaft on
which the coupling is mounted passing through the hole in the bottom and secured by
a nut or nuts a cotter. or cotters or by any other means, on the outer face of the said
internal flange or bottom.
2nd. The insertion of the key or keys which transmit torsional strains from the
coupling disc to the shaft, through the holes or openings in the face of the said
coupling disc, when the same is already in its place on the shaft.
3rd July 1890.
PETER W. MASSON,
11, South Road, Erith, Kent.