Improvements in and relating to the Bucket Ladders of Dredgers and Hopper Dredgers.
Year: 1888

page_text: Date of Application, 16th May, 1888
Complete Specification Left, 16th Feb., 1889
Complete Specification Accepted, 16th Mar., 1889
PROVISIONAL SPECIFICATION
Improvements in and relating to the Bucket Ladders of Dredgers
and Hopper Dredgers.
We, WILLIAM YOUNG FLEMING and PETER FERGUSON, both of Phoenix Works
Paisley, Renfrewshire, Engineers and Shipbuilders, do hereby declare the nature of
this invention to be as follows :-
This Invention which relates to improvements in the bucket ladders of dredgers and
hopper dredgers has for its object to lessen the friction and wear and tear of the
journals and bearings of the tumblers round which the chain of buckets passes and of
the rollers which support the said chain in its traverse over the ladder. To that end
we fit the said journals in roller bearings in lieu of the ordinary bush bearings. The
roller bearings for the tumblers consist of a number of rollers fitted by preference
within a sleeve upon which the tumbler is fitted and having end caps to retain the
rollers which are in contact with the shaft or spindle carrying the tumbler.
1000
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to the Bucket Ladders of Dredgers
and Hopper Dredgers.
We, WILLIAM YOUNG FLEMING and PETER FERGUSON, both of Phoenix Works
Paisley, Renfrewshire, Engineers and Shipbuilders, 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 which relates to improvements in the bucket ladders of dredgers and
hopper dredgers has for its object to lessen the friction and wear and tear of the
journals and bearings of the tumblers round which the chain of buckets passes and
of the rollers which support the said chain in its traverse over the ladder. To that
end we fit the said journals in roller bearings in lieu of the ordinary bush
bearings.
As represented in longitudinal and transverse vertical section at figures 1 and 2 of
the accompanying drawings which illustrate the invention applied to the lower tumbler
of a dredger bucket ladder the roller bearings for the tumblers consist of a number
of rollers A fitted by preference within a sleeve B upon which the tumbler is
fitted and having end caps D to retain the rollers which are in contact with the shaft
or spindle E carrying the tumbler the said shaft being fitted in brackets F at the end
of the bucket ladder G. The rollers A are preferably made of steel and their ends
are reduced in diameter and run in circular grooves in the caps D. The caps D serve
the twofold purpose of keeping the rollers A in position when it may be necessary
to remove the shaft and of preventing sand or grit from reaching the rollers.
Having now particularly described and ascertained the nature of the said Invention
and in what manner the same is to be performed we declare that what we
claim is :-
:-
1. In bucket ladders of dredgers and hopper dredgers the provision of roller
bearings for the tumblers and chain supporting rollers substantially as and for the
purpose set forth.
2. The combination of parts constituting the improved anti-friction roller bearings.
for the tumblers of dredgers and hopper dredgers hereinbefore described with
reference to the accompanying drawings.
Dated this Fifteenth day of February 1889.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.