Improvements in the Construction of Grain and Mineral Conveyors.
Year: 1889

page_text: Date of Application, 11th Jan., 1889
Complete Specification Left, 7th Nov., 1889-Accepted, 7th Dec., 1889
PROVISIONAI. SPECIFICATION.
Improvements in the Construction of Grain and Mineral Conveyors.
I, JOHN STEVENSON 11 Queen Victoria Street London E.C. Engineer & Millwright
do hereby declare the nature of this invention to be as follows:-
This invention has for its object improvements in the construction of Conveyors for
transmitting Grain, Minerals, and similar substances.
For the purpose I employ a flat or attenuated spiral, attached by means of ordinary
paddle-worm flights to a centre spindle. The periphery of the spiral is preferably
thin thickening towards the base and may be formed of a steel bar, or other suitable
material, flat on the propelling side and taper on the rear side, as this greatly
facilitates the operation to be performed by the Conveyors, reduces the friction, and
simplifies the method of manufacture.
The paddle-worm flights may be placed at any suitable distance apart, and may be
attached to the propelling or rear side of the spiral by means of one or more bolts
and nuts, while at each place where the paddle-worm flight is secured to the centre
spindle, I bore a hole transversely through the centre spindle, and through this hole
I pass the bolt end of the paddle-worm-flight, which is secured, in the usual way, by
a nut at the other side of the spindle.
D
1111 1
1000
COMPLETE SPECIFICATION.
Improvements in the Construction of Grain and Mineral Conveyors.
I, JOHN STEVENSON 3 Great Saint Helens London E.C. 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:-
This invention has for its object, improvements in the construction of Conveyors
for transmitting Grain, Minerals, and similar substances.
For the purpose I employ a flat spiral, or the outer part of an Archimedian screw,
attached by means of ordinary paddle-worm flights to a centre spindle. The spiral
may be formed of a steel bar, or other suitable material, flat on both the propelling
and rear sides, as this greatly facilitates the operation to be performed by the Con-
veyor, increases the strength, reduces the friction, and the power of working
Conveyors; and simplifies the method of manufacture.
The paddle-worm flights may be placed at any suitable distance apart, and may he
attached to the propelling or rear side of the spiral by means of one or more bolts and
nuts; while at each place where the paddle-worm flight is secured to the centre
spindle, we bore a hole transversley through the centre spindle, and through this hole
we pass the bolt end of the paddle-worm flight, which is secured in the usual way by
a nut at the other side of the spindle.
In order that my invention may be clearly understood I will describe the same
more fully with reference to the accompanying drawing.
Fig. 1 represents a side view of the spiral, or outer part of an Archimedian screw,
the spindle and paddle-worm flights, and Fig. 2 an end view. In the said Figs. 1
and 2,"A" is the paddle-worm flight, "C" the centre spindle, "B" the flat spiral
or outer part of an Archimedian screw, and "D" the bolts which secure the spiral to
the paddle-worm flights.

page_text: Having now described the nature and object of my said invention, together with
the manner in which the same is to be or may be carried into practical effect, I
wish it to be understood that I claim as my invention the following, viz.,
The combination of parts of the Archimedian and Paddle-Blade Screw Conveyors,
designed to act substantially as and for the purposes set forth and indicated.
Dated this 4th day of November 1889.
JOHN STEVENSON.