Improvements in Archimedean Screws used as Conveyors or Transmitters of Materials.
Year: 1892

page_text: Date of Application, 25th Feb., 1892
Complete Specification Left, 22nd Nov., 1892-Accepted, 4th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Archimedean Screws used as Conveyors or
Transmitters of Materials.
I, GEORGE WILLIAM ELLIOTT of 160 Shirebrook Road, Heeley, Sheffield
in the County of York, Mining and Mechanical Engineer do hereby declare the
nature of this invention to be as follows:-
This invention relates to the manner of constructing Archimedian screws used as
conveyors of material which is by forming them of solid bars of steel, iron, or other
suitable material of suitable sections twisted to a spiral form thus making a screw.
In twisting a thin flat bar of iron or steel of equal thickness throughout its breadth,
it is almost impossible to prevent it overlapping, doubleing or cinqing during the
process of twisting to form or construct an Archimedian screw. By useing a section
thicker in the centre than at the edges, this difficulty is overcome, the twisting
being accomplished with ease and accuracy.
For this purpose I prefer a section having a thick circular centre, having two
longitudinal webs radiating from the said centre and which webs are gradually
reduced in thickness towards the outer edges.
By useing a section of steel, iron or other suitable material of this description I
find the central or circular portion strong enough to prevent the bar from over-
lapping, doubling or cinqing during the twisting operation.
In addition to the above advantage the central or circular portion forms a ready
and secure manner of jointing two or more lengths together, by means of screws,
dowels, or other suitable mechanical means, at the same time forming no obstruc-
tion or inequality detrimental to the passage of the material desired to be conveyed
or transmitted.
1000
G. W. ELLIOTT.
COMPLETE SPECIFICATION.
Improvements in Archimedean Screws used as Conveyors or
Transmitters of Materials.
I, GEORGE WILLIAM ELLIOTT of 160 Shirebrook Road, Heeley Sheffield,
in the County of York, Mining and Mechanical 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:-
In constructing Archimedian screws, to be used as conveyors or transmitters of
material, by forming them of solid bars of steel, iron, or other suitable material it
is almost impossible in twisting a thin flat bar of iron or steel of equal thickness
throughout its breadth to prevent it overlapping or doubleing during the process of
forming the necessary spiral, but by useing a section thicker in the centre than at
the edges, this difficulty is overcome.
By refering to the accompanying sheet of drawings it will be seen Figures 1 and 2
represent respectively a sectional elevation and plan of screw complete. Figures 34
and 5 are enlarged segmental views of same.
The section I prefer Fig. 3, shews a thick circular centre A, having two
longitudinal webs B and B, radiating from the said centre A, and which are
gradually reduced in thickness towards the outer edges.
In useing a section of steel, iron or other suitable material of this description I
make the ceutral or circular portion A, strong enough to prevent the bar overlapping
.
21

page_text: or doubleing during the twisting process. I do not confine myself to the said
circular centre, as in some instances I might find it advantageous to adopt a rectan-
gular, hexagonal or other style of centre.
In addition to the beforementioned advantages, the central portion A, forms a
ready and secure means of joining or attaching two or more lengths together, by
means of dowels C, or any other approved mechanical means, and when required
the webs B and B₁ can be also joined as shewn at D, or by having a cover plate or
similar contrivance on one side of the webs, by these means forming a firm and
simple joint or connection without causing any obstruction or inequality detrimental
to the free passage of the material desired to be conveyed.
Having now 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 :-
1st. The use of Archimedian screws, constructed of steel, iron or other material
and of the section herein described and illustrated on drawings.
2d. The use of conveyors or transmitters of material constructed as generally
shewn and described herein.
3d. The use of sections of steel, iron or other material having a thicker central
portion with one or more webs (reduced if necessary in strength towards the outer
edge) radiating from the said thicker centre in the construction of Archimedian
screws, and as generally herein described and illustrated on accompanying sheet of
drawings.
Dated this Twenty-first day of November 1892