Year: 1898

page_text: I, FRANZ FRIEDRICH WILHELM WALTHER, of 20, Admiralitatstrasse, Hamburg,
Germany, Ship's Officer, do hereby declare the nature of this invention to be as
follows:
The bollards heretofore employed for making fast cables and tow ropes aré
unsuitable, especially for wire ropes, because such ropes, by reason of the excessive
and unequal bending strain to which they are subjected, are very readily broken
and consequently soon become useless.
Further, it is a tedious and a difficult matter to place a rope of that kind around
the bollard arms in the form of an "8," on account of the great resistance of the
rope to bending.
Similar difficulties arise in releasing the cable or tow rope.
Now bollards forming the subject of this invention have for object to obviate the
above-stated drawbacks, for which purpose they are so constructed that the wire
rope is wound spirally around the foot of the bollard in considerably greater turns
than with ordinary bollards, and is held fast solely by the friction thereby pro-
duced. The laying round of the rope requires the same manipulation as
the undoing of the same.
Bollards in accordance with this invention are illustrated in the accompanying
drawings, in which Fig. 1 is a side elevation and Fig. 2 a plan of an oval bollard
with two arms, whilst Fig. 3 shows a round bollard with only one arm.
At the foot a of the bollard, there is provided a spiral groove b with uniform
or varying pitch. This groove has its convolutions made tapering towards the .
top and in these convolutions is placed the cable or rope of corresponding thickness.
In the case of an oval bollard (Figs. 1 and 2) two convolutions are usually
sufficient to hold the cable or tow rope so firmly that it will not yield even to very.
great pulls. This is effected solely by the friction of the rope produced in the
groove in consequence of the different radii of bending. When the rope has
being placed in the groove its end is either left free, or as a precaution it may be
passed between the two bollard arms c, c.
Both bollards, the oval kind as well as the round kind, are provided with spiral
Whilst the former kind is
grooves made for example with a right hand twist.
made with only two convolutions the latter is made with three such convolutions
on account of its comparatively smaller periphery. As already stated, the pitch
of the spiral may be uniform or not.
As shown in the drawing, Fig. 3 the first convolution falls from right to left int
one half of the periphery of the foot a, and it then merges with a suitably increased's
pitch into the second convolution, which is above and parallel to the first convolu-
tion, and has as a continuation the third convolution which is likewise above and
parallel to the second convolution. A wire rope which is led around a bollard so
constructed is drawn by its own pull into the groove in such a manner that it is
held very fast and secure.
%.
;

page_text: The end may either be loose or it may be thrown around the bollard arm c. The
pitch of the spiral may be either uniform or otherwise, as desired and any desired
number of convolutions may be provided.
Dated this 13th day of May 1898.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
1; FRANZ FRIEDRICH WILHELM WALTHER, of 20, Admiralitatstrasse, Hamburg,
Germany, Ship's Officer, 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:-
The bollards heretofore employed for making fast cables and tow ropes ace
unsuitable, especially for wire ropes, because such ropes, by reason of the excessive
and unequal bending strain to which they are subjected, are very readily broken
and consequently soon become useless.
Further, it is a tedious and a difficult matter to place a rope of that kind around
the bollard arms in the form of an "8," on account of the great resistance of the
rope to bending.
Similar difficulties arise in releasing the cable or tow rope.
Now bollards forming the subject of this invention have for object to obviate the
above-stated drawbacks, for which purpose they are so constructed that the wire
rope is wound spirally around the foot of the bollard in considerably greater turns
than with ordinary bollards, and is held fast solely by the friction thereby pro-
duced. The laying round of the rope requires the same manipulation as
to coil a cable.
.Bollards in accordance with this invention are illustrated in the drawings filed
with my Provisional Specification, in which Fig. 1 is a side elevation and Fig.
a plan of an oval bollard with two arms, whilst Fig. 3 shows a round bollard with
only one armi.
At the foot a of the bollard, there is provided a spiral groove with uniform
or varying pitch. This groove has its convolutions made tapering towards the
top and in these convolutions is placed the cable or rope of corresponding thickness.
In the case of an oval bollard Figs. 1 and 2) two convolutions are usually
sufficient to hold the cable or tow rope so firmly that it will not yield even to very
great pulls. This is effected solely by the friction of the rope produced in the
groove in consequence of the different radii of bending. When the rope has
been placed in the groove its end is either left free, or as a precaution it may be
passed between the two bollard arms c, c.
Both bollards, the oval kind as well as the round kind, are provided with spiral
grooves made for example with a right hand twist. Whilst the former kind is
made with only two convolutions the latter is made with three such convolutions
on account of its comparatively smaller periphery. As already stated, the pitch
of the spiral may be uniform or not..
As shown in the drawing, Fig. 3 the first convolution falls from right to left in
one half of the periphery of the foot a, and it then merges with a suitably increased
pitch into the second convolution, which is above and parallel to the first convolu-
tion, and has as a continuation the third convolution which is likewise above and
parallel to the second convolution. A wire rope which is led around a. bollard so

page_text: constructed is drawn by its own pull into the groove in such a manner that it is
held very fast and secure.
The end may either be loose or it may be thrown around the bollard arm c. The
pitch of the spiral may be either uniform or otherwise, as desired and any desired
number of convolutions may be provided.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. A ship's bollard having a groove formed in the periphery of the baseplate a
and extending upwards in a spiral manner for the purpose of securing cables and
tow-ropes, substantially as described.
2. Bollards for securing cables and the like constructed as hereinbefore described
with reference to and shown in Figs. 1 and 2, or in Fig. 3, of the drawings.
1. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.