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conical grinding surface and adapted to rotate against within said base structure to rotate said table and said
the flat floor of said container about an oblique axis pass- container thereon about a vertical axis; motor means
ing through the axis of rotation of said container, said remote from said base structure and said table; shield-
muller wheel being rotated adjacent said centerpiece by ing means enclosing said power transmission means and
the rotation of said container; a shaft for said muller 5 said vertical shaft; a cradle support structure located at
wheel; bearing means for rotata:bly ca:rrying said shaft one side of said rotatable table and said container there-
said bearing means being located over an area horizontally on; a horizontal cradle shaft means rotatably mounted
removed from the upper opening of said container; and in said cradle support structure; a bearing cradle rotat-
a cradle means supporting said bearing means and adapted ably mounted on said cradle shaft; a muller wheel adapt-
to rock about a horizontal axis to permit said muller 10 ed to rotate on the floor of said container around an
wheel and shaft to be lifted clear of the bottom of said oblique axis, and a shaft extending from said muller
container. wheel over the upper edge of said container and rotat-
2. A muller which includes: a fiat-bottomed container ably received in said· bearing cradle; a cover cradle ro-
in which to grind material; means for rotating said con- tating integrally with said cradle shaft; a cover covering
tainer about a vertical axis; a muller wheel with a conical 15 said container and supported from said cover cradle;
grinding surface and adapted to rotate against the flat floor counterweights carried on said cradle shaft and cover
of said container about an oblique axis passing through cradle assembly and rotating therewith; adjustable en-
the axis of rotation of said container and passing above gagement means between said bearing cradle and said
the edge of the upper opening of said container, said cover cradle for permitting said bearing cradle to move
muller wheel being rotated by the rotation of said con- 20 freely through a small arc, but engaging said bearing
tainer; a shaft for said muller wheel; bearing means for cradle and carrying it and said muller wheel and said
rotatably carrying s~d shaft, said ·bearing means being muller wheel shaft with said cover cradle when the latter
located over an area horizontally displaced from the upper is rocked upwards through a large angle; and latch means
opening of said container; a cradle means supporting said for locking said cover cradle to said cradle support struc-
bearing means and adapted to rock about a horizontal 25 ture to maintain it in a desired position relative thereto.
axis to permit said muller wheel to be lifted clear of the 6. A muller which includes: a stationary base struc-
bottom of said container; and counterweight means ture; a rotatable table supported on said base structure;
carried by said cradle means and counterbalancing the a cylindrical skirt on said table for shielding the space
greater part of the weight of said muller wheel. ·between said base structure and said table; a flat-bot-
3. A muller which includes: a fiat-bottomed container 30 tomed container open at the top and supported on said
in which to grind material; means for rotating said con- table; means for rotating said table on said base struc-
tainer about a vertical axis; a muller wheel with a coni- ture; a vertical shaft within said base structure to rotate
cal grinding surface and adapted to rotate against the said table and said container thereon about a vertical
fiat floor of said container about an oblique axis passing axis; a cradle support structure located at one side of
through the axis of rotation of said container and passing 35 said rotatable table and said container thereon; a hori-
above the edge of the upper opening of said container, zontal cradle shaft means rotatably mounted in said
said muller wheel being rotated by the rotation of said cradle support structure; a bearing cradle rotatably
container; a shaft for said muller wheel; bearing means mounted on said cradle shaft; a muller wheel adapted
for rotatably carrying said shaft at one side of the upper to rotate on the floor of said container around an oblique
opening of said container; a cradle means supporting 40 axis, and a shaft extending from said muller wheel over
said shaft and adapted to rock about a horizontal axis the upper edge of said container and rotatably received
to permit said muller wheel to be lifted clear of the bot- in said bearing cradle; a cover cradle rotating integrally
tom of said container; and cover means supported by with said cradle shaft; a cover covering said container
said cradle means over said container. and supported from said cover cradle; counterweights
4. A muller which includes: a flat-bottomed container 45 carried on said cradle shaft and cover cradle assembly
in which to grind material; means for rotating said con- and rotating therewith; adjustable engagement mea:ns be-
tainer about a vertical axis; a muller wheel with a coni- tween said bearing cradle and said cover cradle for per-
cal grinding surface and adapted to rotate against the mitting said bearing cradle to move freely through a
flat floor of said container about an oblique axis passing small arc, but engaging said bearing cradle and carrying
through the axis of rotation of said container and passing 50 it and said muller wheel and said muller wheel shaft with
above the edge of the upper opening of said container, said cover cradle when the latter is rocked upwards
said muller wheel ·being rotated by the rotation of said through a large angle; packing means between said rotat-
container; a shaft for said muller wheel; bearing means ing container and said cover, and between said rotating
for rotatably carrying said shaft at one side of the upper muller shaft and said cover; and latch means for locking
opening of said container; a cradle means supporting said 55 said cover cradle to said cradle support structure to main-
shaft and adapted to rock about a horizontal axis to per- tain it in a desired position relative thereto.
mit said muller wheel to be lifted clear of the bottom
of said container; and scraper means engaging the interior References Cited in the file of this patent
surfaces of said container and supported from said cradle
means. 60 UNITED STATES PATENTS
5. A muller which includes: a stationa:ry base struc- 261,955 Richardson _____________ Aug. 1, 1882
ture open at the top; a circular rolling bearing track sup- 964,224 Emerick ______________ July 12, 1910
ported on said base structure and encircling said top open- 1,478,478 Kreutzberg ____________ Dec. 25, 1923
ing; a rotatable table and rolling bearings supported on 2,793,837 Goldman ______________ May 28, 1957
6
said base structure by said track; a cylindrical skirt on 5
said table for shielding the space between said base struc- FOREIGN PATENTS
ture and said table; a flat-bottomed container open at 313,845 Great Britain __________ June 20, 1929
the top and supported on said table; a vertical shaft 818,721 Germany _______________ Aug. 4, 1952