New or Improved Wood Fibre Ropes.
Year: 1892

page_text: Date of Application, 20th Apr., 1892-Accepted, 28th May, 1892
COMPLETE SPECIFICATION.
New or Improved Wood Fibre Ropes.
I, OSCAR MARWITZ, of Schierstein, Germany, Manufacturer, 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 :-
My invention relates to the manufacture of ropes from wood fibre, which are
specially suitable as a substitute for straw ropes used for winding round the cores
which are employed in iron and metal foundries.
The manufacture of the wood fibre rope according to my invention is effected in
such a manner that each rope is composed of threads or strands of two or more
different kinds of wood, whereby the strands of each kind of wood are possessed of
different strength, all as hereafter described.
For this purpose I proceed as follows:-I make in the first place a loose twist
of, say, pine or poplar fibre, the strands of which are very fine, and I do this by
means of known machinery, such as is used for spinning simple twisted hemp yarn.
I work the machine however at only a moderate speed of say about 80 revolutions
per minute, and allow the wood fibre given out to be taken away by the machine
with all the rapidity of which the latter is capable. In this manner I obtain a
twist which is twisted as loosely as possible.
I then make a second yarn, but say of aspen or willow, the threads of which are
stronger than those of the pine wood or poplar. For the production of this yarn I
give the machine a rapidity of about 160 revolutions per minute, and I feed the
wood fibre only sparingly, that is I allow it to run in, as slowly as possible, so that
the machine must draw the wood fibre from the worker with a certain amount of
force, whereby I obtain a very firmly twisted yarn.
I then put both twists, the loose and the firmly twisted, through the spinning
machine together at a speed of about 120 revolutions, and so twist both yarns
together into a rope. The advantages of the ropes so manufactured are the greater
firmness obtained by the rapid and close twisting of the aspen or willow fibre yarn,
and the receptivity and permeability of the loosely twisted pine wood or poplar
fibre twist, which permits the free passage of the gases developed in the foundry.
Instead of the rope being composed of two twists, it may be of three or more
twists, two or more of which may consist of aspen or willow fibre, and the others of
pine wood or poplar fibre. Each twist must, however, be of a particular kind of
wood fibre.
The manufacture of these wood fibre ropes may also, according to my invention,
be varied by the employment of a firmly twisted twist of aspen or willow wood fibre
being made in the first place, and then this yarn being allowed to go through the
machine with the addition of the thin pine wood or poplar fibre, the machine going
at a speed of about 80 revolutions per minute, and the thin fibre being as plentifully
given out as the machine is able to take it. In this way the firm inner twist is
spun round with a loose covering; the first gives the rope the solidity which it
must have for winding round the casting cores, and the latter affords free passage
to the escaping gases.
In the last mentioned rope the use of two different kinds of wood is not absolutely
necessary, as it might be composed of one and the same wood fibre only.
The covering of the inner wood fibre rope may also be made, at pleasure, of other
vegetable fibres, for example, of straw, hay, hemp, flax, manilla, cocoa fibre, or
the like

page_text: 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 :-
1. The manufacture of wood fibre ropes as a substitute for straw ropes for
winding round casting cores, in such manner that the rope is composed of two or
more twists, one or more of which is made of loosely twisted pine wood or poplar
fibre, whilst the other or remaining twists are of firmly twisted aspen or willow
fibre, so that the rope, in consequence of the firmly twisted parts, is possessed of
the necessary strength, and in consequence of the loosely twisted parts permits the
free escape of the developed gases, substantially as set forth.
2. The manufacture of wood fibre ropes, similar to those claimed by Claim 1,
except that the rope is composed of a firmly twisted twist forming the inner core
of the rope, and an outer loosely twisted twist going round the core as a covering,
which latter also may be of straw, hay, hemp, flax, manilla, cocoa fibre, or any
other vegetable fibre, and substantially as set forth.
719 2011
ג
$1 1900
BREWER & SON,
Agents.