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US 5,454,749 AGranted
Grinding method and apparatus
OwnerIetatsu Ohnoinventor
Life of this patent
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OwnerIetatsu Ohnoinventor
Estimating the term…
A grinding method is provided which is capable of uniformly and precisely grinding objects for a short time, softening shocks produced when the rotation of a grinding barrel is changed between the forward direction and the backward direction to thereby eliminate bruises on the surface of grounded objects, coping with grinding for a large number of objects to be ground in a small quantity or a heavy-weight or a large-size object to be ground, and preventing contacts and collisions between objects to be ground. The grinding method comprises the steps of rotatably mounting not less than one grinding barrels at locations away from the central axis of a rotary drum, enclosing a grinding material and objects to be ground in the grinding barrels, rotating the grinding barrels in the directions identical to and opposite to the direction in which the rotary drum is rotated, and grinding the objects to be ground. An grinding apparatus for implementing the above-mentioned method is also provided.
Apparatus for grinding or polishing workpieces in particulate media comprising:
Apparatus for grinding by polishing particulate materials comprising a frame journalled about a central longitudinal axis, at least one grinding barrel, each said grinding barrel being rotatably located within a supporting drum journalled on said frame for rotation in clockwise and counterclockwise directions about a second axis radially spaced from said central axis, and drive means for independently rotating said frame and each of said drums respectively, including means for selectively changing the direction of rotation of selected ones of said frame and said drums, said grinding barrel has a length no greater than 0.8 times longer than the diameter thereof, wherein at least one of said grinding barrels comprises an outer barrel member having arbitrary cross sections, and an inner barrel having the same external shape as that of said outer barrel, provided with an opening, said inner barrel being removably inserted into said outer barrel and being divided at a predetermined angle with respect to the axial direction to form a plurality of subchambers.
Dependencies are inferred from the claim text.