Year: 1886

page_text: Date of Application, 6th Nov., 1886.
Complete Left, 5th Aug. 1887.
Complete Accepted, 6th Sept., 1887.
I ISAAC BLUE HARRIS of Castle Mills, Fountainbridge, Edinburgh, India Rubber
Manufacturer do hereby declare the nature of this invention to be as follows:-
Deckle straps are used on paper making machines, and their function is to form
the edges of the web of paper while the pulp is taking consistency on the wire cloth
apron. They travel with that apron and over guiding pulleys, and are made endless.
They are made of india rubber, usually rectangular in section, with a layer or two
of cloth in the centre, to determine their length, or to prevent their stretching to
varying lengths. These layers are made of non elastic cloth (or nearly so), but,
being placed centrally, they permit of the straps bending round the guiding pulleys.
In consequence of some cause, or causes, not well understood, the rubber on either
side of the central cloth layers often cracks, and the bending of the straps round
the guiding pulleys makes the cracks tear, and the straps speedily get unfit for use.
My improvements are directed to overcoming this defect, and consist in placing a
layer or two of elastic cloth near each surface of the strap, or, in placing layers of
similar cloth on either side of the central layers of non elastic cloth, and extending
therefrom to near the surfaces of the strap. In either case the depth of solid rubber
on each side of the strap is reduced to about th inch, a depth too little to permit of
any crack or tear becoming seriously detrimental to the strap. These layers of elastic
cloth or fabric are coated with India rubber, by which they are readily fixed in
position. They are either woven so as to be elastic, or they may be got by cutting
non elastic cloth diagonally into strips of any required width, a process which, as
well as that of putting the layers in position, is well known to India Rubber
Manufacturers.
Dated this fith day of November 1886.

page_text: I, ISAAC BLUE HARRIS of Castle Mills, Fountainbridge, Edinburgh, India Rubber
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 :-
Deckle straps are used on paper making machines, and their function is to form
the edges of the web of paper while the pulp is taking consistency on the wire cloth
apron. They travel with that apron and over guiding pulleys, and are made endless.
They are made of india rubber, usually rectangular in section, with a layer or two of
cloth in the centre, to determine their length, or to prevent their stretching to varying
lengths. These layers are made of non elastic cloth (or nearly so), but, being placed
centrally, they permit of the straps bending round the guiding pulleys. In consequence
of some cause, or causes, not well understood, the rubber on either side of the central
cloth layers often cracks, and the bending of the straps round the guiding pulleys
makes the cracks tear, and the straps speedily get unfit for use.
a
My improvements are directed to overcoming this defect, and consist in placing
layer or two of elastic cloth near the surface or surfaces of the strap. The depth
of solid rubber outside of or beyond the elastic cloth is reduced to about th inch,
a depth too little to permit of any crack or tear becoming seriously detrimental to
the strap. These layers of elastic cloth or fabric are coated with India rubber, by
which they are readily fixed in position. They are either woven so as to be elastic,
or they may be got by cutting non elastic cloth diagonally into strips of any required
width, a process which, as well as that of putting the layers in position, is well known
to India Rubber Manufacturers.
In order that my invention may be fully understood and readily carried into effect
I will proceed to describe the drawings herennto annexed.

page_text: Figure 2 is a transverse section of the improved deckle strap-a is the india rubber
and b the inelastic bands as before. c c are bands of elastic fabric inserted into the
substance of the india rubber near the surface. Such bands may be inserted on both
sides of the inelastic bands 6 but if they be on one side only they should be on
that side which is the outer side when the deckle strap passes around its guide
rollers.
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 :—
A deckle strap composed of vulcanised india rubber a with bands b and c embedded
therein substantially as described.