Year: 1888

page_text: Date of Application, 19th Nov., 1888
Complete Specification Left, 20th Apr., 1889
Complete Specification Accepted, 8th June, 1889
I, JOHN LAIDLAW of the firm of Watson Laidlaw & Company of 98 Dundas Street,
Kingston, Glasgow, in the Counties of Lanark and Renfrew, North Britain, Engineer,
do hereby declare the nature of this invention to be as follows :-
This Invention, which relates to improvements in the construction of Weston's
Centrifugal Machines, relates to that class of such machines which are driven from
below, and the Invention has for its object to prevent matter, when the machine is not
in motion from falling in between the opening which at present exists, and the sur-
rounding casing. The Invention consists in making the top lip of the revolving basket
of the Weston's Centrifugal Machine of a curved form in transverse section, the curve
of this portion being struck from the centre of oscillation so that as the basket of the
machine vibrates or oscillates the curved transverse section of the lip, by virtue of
being struck from such contre always maintains the same relationship between the top
lip and the upper part of the enclosing casing.
Dated this 17th day of November 1888
ST. JOHN V. DAY,
115, St. Vincent Street, Glasgow,
Petitioner's Agent.

page_text: Improvements in the Construction of Weston's Centrifugal Machines.
I, JOHN LAIDLAW, of the firm of Watson Laidlaw & Company, of 98 Dundas Street,
Kingston, Glasgow, in the Counties of Lanark and Renfrew, North Britain, 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:
My Invention which relates to improvements in the construction of Weston's
Centrifugal Machines, relates to that class of such machines which are self-balancing
and driven from below, and my Invention has for its object the construction of the
machine in such a manner that material will be prevented from falling into the space
between the revolving basket and the outer casing when the machine is not in
motion.
The Invention consists in making the top lip of the revolving basket of the
centrifugal machine of a curved form in transverse section, the curve of this
portion being struck from the centre of oscillation so that as the basket of the
machine vibrates or oscillates the curved transverse section of the lip, by virtue
of being struck from such centre always maintains the same relationship between
the top lip and the upper part of the enclosing casing.
In order that my Invention may be properly understood and readily carried into
effect, 1 will now proceed to describe the drawing hereunto annexed.
The drawing is a vertical section of a self balancing centrifugal machine, in which
the perforated basket or cage is free to oscillate.
The top lip of the revolving basket is shewn at a, b. This top lip is made of
By making
curved form, the curve being struck from the centre of oscillation c.
the top lip of this form the upper part of the enclosing casing d, can be constructed
so as to be close to the top lip, and thus prevent any material falling in between
the basket and the surrounding casing. The curve a, b, being struck from the
centre of oscillation, when the basket revolves, vibrates or oscillates, the space
between the surface a, b, and the lip of the enclosing casing, d, will remain uniform.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In Weston's self-balancing centrifugal machines in which the revolving basket or
cage is free to oscillate about a given centre, making the top lip of the revolving
basket or cage of a curved shape in transverse section, which curve is struck from the
centre of oscillation, substantially as described and shewn in the drawing.
CA 1000