Appeal No. 97-1973
Application No. 08/248,003
Gray discloses a bucket dredger comprising a pivoted
ladder E, a top tumbler A mounted on shaft a, gears B,b for
driving shaft a, a polygonal lower tumbler M, links C,C' which
form an endless chain and buckets D bound to a plurality of
links C (lines 60-69). The buckets further include a bottom
wall d provided with downwardly bent sides or ribs e which are
substantially parallel to the side walls of the bucket (Figure
3) and extend substantially along a length of the bottom wall
(Figure 3a). When the buckets are assembled with the endless
chain, the sides or ribs e are clamped between the links C
together with the ends of the rim H, and the side pieces of
the body portion. A shim f is inserted between the link and
the side
piece in order to completely fill the space between the links
C. See Figure 7 and page 2, lines 22-25 and 37-58.
Whisler discloses a tumbler used for confining a chain of
buckets against lateral displacement (page 1, left-hand
column, lines 1-9) including a confining flange 2a. See, for
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