IMPROVEMENTS IN BUCKET DREDGERS
Year: 1882

page_text: лютоNAD
DIECIFICATION felt by the said George King at the once
of the Commissioners of Patents on the 8th December 1882.
GEORGE KLUG Engineer of Hamburg Germany "IMPROVEMENTS IN BUCKET
DREDGERS
"
This Invention relates to certain improvements in the construction of dredgers
and has for its purpose to improve the combined working of tumblers for
polygonal discs and bucket chains, which parts are as is well known to engineers
and persons acquainted with the present construction of dredging plant are liable
to the most troublesome and costly repairs.
Instead of forming the working or bearing surfaces of a tumbler fully of iron
or steel as heretofore I provide the same with a lining of wood which does not
damage the chain links that are passing over them. For each working surface of
the tumbler this lining may either be formed in one piece or in several parts or
blocks and be put into dovetail or otherwise shaped grooves or recesses at the sides
of the tumbler The lining may be secured in its position either by the shape of
such grooves or recesses or by means of screw-bolts, wedges splits or nails. Such
lining can easily be renewed and by changing its thickness as required, the pitch of
the tumbler can always be kept in accordance with and to the pitch of the chain-
links if the latter increases by wear of the pins.
I also form the working surfaces of the bucket links and intermediate links
equal to each other in such manner that the surfaces of the tumbler are not
exposed to different sized surfaces of chainl inks so as to secure to the sides of the
tumbler a uniform wear and tear. Further in cases when such construction is
possible I widen the surfaces of the chain links (in direction of the tumbler axis)
over the width of the joints, so that the thrust of the chain is distributed over the
whole or nearly the whole width of the tumbler.
Furthermore I prolong or extend the working surfaces at the driving sides,
over the figure of the tumbler up to the centre-line of the corresponding bolt-joint of

page_text: the chain in order to reduce the distance between supporting surface and point of
thrust.
To enable the chain to clear these projections the following end of the chain
links has to be furnished with a recess or bend or such recess has to be provided
for in said projection.
The invention is illustrated by the accompanying sheet of drawings, of which
Fig O represents a tumbler or polygonal disc and part of a bucket chain according
to the construction now generally in use. The working surfaces 1 of the tumbler
are shown partly worn out and as at same time the pitch of the chain 2 has
become larger by wear and tear of the joints 10 it will be understood with
reference to the drawings that a very disadvantageous action between tumbler
and chain must result as soon as wear and tear surmounts a certain degree.
Fig. 1 represents the foregoing construction but the sides of the tumbler covered
with a wooden lining or sheathing 3 and the surfaces of the intermediate links 4
widened as at 5 so as to be of equal width to the bucket links 6 with respect to
their working surface.
In Fig. 2 the tumbler is covered by wood the working surfaces of the chain are
equal to each other, they are widened as at 7 beyond the width of the joints 8
and distribute the thrust over nearly the whole width of the tumbler 9. The
surfaces are also at the driving sides 11 extended forming necks 12 on the tumbler,
that reach up to the centre line of the corresponding bolt joint 10° as before
described. To prevent interfering with these necks the following ends of the chain
links are provided with a bend or a recess 13. Another modification is shown by
Fig. 3 where recesses 14 are provided for in the projections or necks of the tumbler
to allow, the links to clear the same.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Klug in the Great Seal Patent Office on the 8th June
1883.
GEORGE KLUG, Engineer of Hamburg Germany,
DREDGERS
»
"IMPROVEMENTS IN BUCKET
This Invention relates to certain improvements in the construction of dredgers
and has for purpose to improve the combined working of tumblers or polygonal
discs and bucket chains and to do away with certain most troublesome and costly
repairs, to which these parts are liable under the ordinary construction, as is well
known to engineers and persons acquainted with dredging plant.
Firstly instead of forming the working or bearing surfaces of, a tumbler fully
of iron or steel as heretofore, I provide the same with a lining of wood or other
suitable material which does not damage the chain-links, that are passing over
them, and again the true form of the links being retained will in return not
spoil the surfaces or sides of the tumbler, as is the case with the ordinary
construction, where the surfaces, both of metal, are wearing off each other.
Furthermore, the lining can easily be removed and renewed, and by changing
its thickness as required the pitch (or the length of the sides) of the tumbler can
always be kept in accordance with and to the pitch of the chain links, if the latter
increases by wear of the pins whereby the very disadvantageous action is avoided,
which under the ordinary construction must result, as soon as wear and tear
surmounts a certain degree.
For each working surface of the tumbler this lining may either be formed in
one piece or in several parts or blocks and be put into dovetail or otherwise shaped
grooves or recesses at the sides of the tumbler. The lining may be secured in its
position either by the shape of such grooves or recesses, or by means of screw-bolts,
wedges, splits or nails.
To avoid the wood or material of the lining being damaged or crushed by the
heavy thrust or pressure I provide the bucket links as well as intermediate links
with as largely widened working or thrust surfaces as possible, that is to say:
where such construction is possible I widen the surfaces of the chain links (in
the direction of the tumbler-axis), beyond the width of the joints, so that the
thrust of the chain is distributed over the whole or nearly the whole width of the
tumbler.
I also prefer to form the surfaces of bucket and intermediate-links equal to
each other in such manner that the surfaces of the tumbler are not exposed to
different sized surfaces of chain-links so as to secure to the sides of the tumbler a
uniform wear and tear.
Secondly. I prolong or extend the working surfaces of tumbler and chain links
at the driving sides beyond the figure of the tumbler, eventually up to the centre-
line of the corresponding bolt joint of the chain. These "neaks" (as I might call
the extensions formed on the tumbler) reduce the distance between point of thrust
and supporting surface that is to say: they increase the power of resistance and
the actual size of tumbler and chain surfaces in a most effective manner and
accordingly the surfaces will be more durable and last much longer.
There is another advantage connected with these "necks." Although it is
evident that for instance a five-sided or pentagon tumbler causes a more uniform
speed and smoother working of the bucket-chain than a square one, still-in
favour of the latter, the former often is avoided, because the chain is liable to slip
thereon; now this slipping of the chain is prevented by the application of the
said necks.

page_text: To enable the chain to clear these projections, the following end of the chain-
links has to be furnished with a recess or bend or such recess has to be provided
for in said projections or necks.
In carrying out this invention its two parts may be applied either combined or
separate of each other according to circumstances.
1.
1
In order that my said invention may be well understood there is annexed
hereto a sheet of drawings wherein Fig 0 represents a tumbler or. polygonal
disc and part of a bucket chain according to the form of construction now generally
in use.
.
1
The working surfaces 1 of the tumbler are shown partly worn out and the
pitch of the tumbler diminished and as at same time the pitch of the chain 2
has become larger by wear and tear of the joints 10 it will be understood by
and with reference to the drawings, that a very disadvantageous action between
tumbler and chain must arise as soon as wear and tear surmounts a certain
degree.
P
Fig 1 represents the foregoing construction but the sides of the tumbler covered
with a wooden lining or sheathing 3 and the surfaces of the intermediate links 4
widened as at 5 so as to be of equal width to the bucket-links 6 with respect to
their working surface.
In Fig 2 the tumbler is covered by wood the working surfaces of the chain
are equal to each other, they are widened as at 7 beyond the width of the
joints 8 and distribute the thrust over nearly the whole width 9 of the tumbler.
The surfaces are also at the driving sides 11 extended forming necks 12 on the
tumbler that reach up to the centre-line of the corresponding bolt joint 10° as
before described.
To prevent any interference with these necks the following ends of the chain-
links are provided with a bend or a recess 13. Another modification is shown by
Fig 3 where recesses 14 are provided for in the projections or necks of the tumbler
to allow the links to clear the same.
The necks as well as the grooves for the reception of the lining can be formed
in one piece with the tumbler surface or may be constructed separately and be
attached to the tumbler by bolts, rivets and so forth.
Having thus particularly described and ascertained the nature of my said
invention and the manner in which the same may be carried into practical effect,
-I claim -
Firstly. Providing the tumblers of bucket-dredgers with a lining or sheathing
upon their wearing surfaces as and for the purpose herein set forth and as shown
by the respective figures of the, drawings.
Secondly. Forming the bearing or working surfaces of chain-links and .tumbler
with an extension portion beyond the tumbler as and for the purpose herein before
described in reference to and shown by the respective figures of the accompanying
drawings.
In Witness whereof I the said George Ķlug have hereunto set my liand
and seal this Second day of June in the year of our Lord one thousand
eight hundred and eighty-three.