Abstract: An excavating dipper for use with power shovels, draglines and the like is fabricated from steel plate and is formed to have a separable bottom body member, which may be replaced when worn. The dipper is of lightweight steel plate construction fabricated into substantially all welded top and bottom body members. The plate members forming the side and bottom walls of the bottom body member are reinforced by longitudinal and transverse girth ribs.

Abstract: The payload capacity of an excavating dipper or bucket for a power shovel or dragline is increased by providing an upper bucket portion having support brackets and the strength to support the rated load of the dipper and a disposable lower portion having opposed sidewalls and a bottomwall of a material thickness less than the upper sidewalls and topwall. The lower sidewalls are secured to the upper sidewalls by interference fitted retaining pins disposed in machined bores formed in the upper sidewalls and the lower sidewalls, respectively. The upper sidewalls may be modified to provide spaced-apart plate members which define a slot for receiving the lower sidewall portions, respectively.