B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
209/171
B07B 11/00 (2006.01) B03B 5/02 (2006.01) B03B 5/74 (2006.01) B29C 33/38 (2006.01) B29C 39/02 (2006.01)
Patent
CA 1183491
SPIRAL ORE CONCENTRATING PAD APPARATUS AND METHOD ABSTRACT A spiral ore concentrating pad apparatus and fabrication method allows the efficient and inexpensive production of spiral concentrating pads of any size or configuration. A mold for the pad is made using elongated strips of flexible material having a variable cross section. The strips are disposed in planar and spiral orientation and glued tightly together to a backing plate. A mold is made by forming a hardenable material such as fiberglass over the strips. When strips having sawtoothed cross section are used, the,mold so produced has an internal contour having a sawtoothed-shaped recess spiralling from the center to the periphery of the mold. Spiral concentrating pads are the made from the mold with a variety of methods. First, material can be compressed into the mold to produce the pad. Second, liquid material may be poured into the mold and allowed -to harden to produce the pad. Third, flexible stripping can be wound into the internal contours of the mold and a backing plate affixed thereto to produce the pad. Fourth, the original stripped pad or negative mold may be used to produce a vacuum formed part from thermodeformable plastic.
377641
Cleland Keith
Oldendorf Eric W.
Cleland Keith
Smart & Biggar
LandOfFree
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