Improvements in the Construction of Archimedean Screws.
Year: 1892

page_text: The decision of the Comptroller-General, of the 29th day of March 1894,
allowed, under Section 18 of the Patents, &c. Act, 1883, an Amendment of
this Specification.
Date of Application, 22nd Nov., 1892
Complete Specification Left, 19th Aug., 1893-Accepted, 30th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Archimedean Screws.
We RICHARD HARLEY WILLIAMSON of 21 Victoria Street, Ashton-under-Lyne
in the County of Lancaster, Joiner, and JAMES DYSON of Good Hope Mill,
Ashton-under-Lyne, in the County of Lancaster, Cotton Spinner, do hereby
declare the nature of this invention to be as follows:-
Our said invention relates to an improved construction of Archimedean screws
such for example as are used as conveyors for grain, fuel and other solid, plastic,
semi-plastic or liquid bodies.
According to our said invention we form the blade or vane of the screw in sections
which are threaded on to a central shaft preferably of prismatic shape or otherwise
so devised as to prevent the said sections from turning thereon.
The adjacent ends of each section are so shaped as to securely engage with each
other as each successive section is threaded on to the shaft. Only the end sections
need be secured to the central shaft and when these are secured by bolts, wedges
or other suitable means the entire series of sections forms a continuous Archimedean
screw about the central shaft. By removing one of the end sections the intervening
sections can be easily removed from the shaft and replaced with facility when
broken or worn. The sections may be cast or wrought to the proper form and
according to one part of our said invention we build up a screw with sections of
chilled cast metal in order to obtain greater durability.
Dated this 19th day of November 1892.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicants.
COMPLETE SPECIFICATION (AMENDED).
Improvements in the Construction of Archimedean Screws.
We RICHARD HARLEY WILLIAMSON of 21 Victoria Street, Ashton-under-Lyne
in the County of Lancaster, Joiner, and JAMES DYSON of Good Hope Mill,
Ashton-under-Lyne, in the County of Lancaster, Cotton Spinner, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement :-
My Our said invention relates to an improved construction of Archimedean screws
such for example as are used as conveyors for grain fuel and other solid plastic
semi-nlastic or lianid bodies.

page_text: at 6.
A screw made in accordance with my our said invention is shown in the
accompanying drawing of which Figure 1 is a side view and Figure 2 an end view.
The blade or vane of the screw is formed in sections a the ends of which are
formed with dovetails or other similarly shaped projections and recesses as shown
When the sections of the blade of the screw are threaded on to a central
shaft as c the said recesses and projections of the sections engage with each other.
When the end sections are secured to the shaft as for example by an angle iron d
the sections form a continuous screw. By removing one of the end sections the
intervening sections can be easily withdrawn from the shaft and be replaced when
worn or broken.
The sections may be cast or forged or bent to the proper form and of any suitable
material. We prefer however to make them of chilled cast iron. The central
shaft need not necessarily be square but may be of any other convenient prismatic
shape or may be a cylindrical shaft if one or more flats are formed thereon or other
means are provided for resisting the tendency of the sections to revolve on the
*shaft.
It will be obvious that the end sections may be secured to the shaft in many
other ways than that shown as for example by bolts, wedges, or studs.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
:―
An Archimedean screw consisting of sections the ends of which are shaped so as
to engage with each other when the whole is threaded longitudinally on and secured
to a central shaft, substantially as set forth and shown in the accompanying drawing.
Dated this 18th day of August 1893.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicants.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicants.