"The Reiter patent relates to a cleaner
the manufactured version of which was the
Stephens-Adamson cleaner, . . . and there
was evidence that a number (though
perhaps not many) of these had been sold
in Australia prior to the priority date.
Another U.S. patent, for the earliest
version of the Stephens-Adamson cleaner,
was referred to as the later Sinden
patent. The specification of that patent
became open to public inspection in the
Australian Patent Office, Canberra, on 27
February 1958. It was not suggested by
counsel for any party that, for present
purposes, a significant distinction
should be drawn between the two patents
relating to cleaners of the Stephens-Adamson
type. Each involves a supporting
pipe transverse to the conveyor belt,
held at either end by attachment to a
vertical support with a series of holes
drilled in it, so as to make provision
for raising and lowering the pipe.
Another support, of a length at least
equal to the width of the belt, rests on
the supporting pipe. That other support
is called, in various parts of the
specification of the Reiter patent, 'the
supporting frame', 'a support adapted to
be mounted transversely of the belt to be
cleaned', 'the support', 'an elongated
support member, holder or cross angle'.
It is of L-shaped cross-section, and has
fixed to it a number of C-clips
(catalogues with illustrations of the
Stephens-Adamson cleaner show two
C-clips), so that when it sits on the
pipe support the two surfaces presented
by its L-shaped cross-section encompass
about half of the circumference of the
pipe support, which the C-clips enable it
to grip by partially completing that
encompassment. As the specification says:
'The holder . . . is mounted to
rotate and to slide on the
supporting pipe . . . by a plurality
of C-clips . . . fixed to the holder
. . .'
At one end of the holder there is a
mechanism comprising a lever, arcuate
slot, and wing nut, by means of which the
scraper blade pressure may be regulated
by rotating the holder on the pipe
support. In the Reiter patent, the arms
bearing the scraper blades are 'fixedly
connected to the supporting frame', that
is to the holder. The specification
refers to a method for 'fixedly
connecting one end portion to the
support' by the use of mounting eyelets
by which it is bolted to the support.
The method of getting access to work on
the scraper blades of the Stephens-Adamson
cleaner for maintenance is
simple, but it obviously requires space
beside the conveyor belt comparable to
the width of the belt itself, for the
holder (with its attachments) has to be
slid off the pipe support, after removal
of the wing nut on the bolt in the
arcuate slot which fixes the whole
apparatus in position."