IMPROVEMENTS IN MACHINERY OR APPA- RATUS FOR GRINDING OR REDUCING MIDDLINGS INTO FLOUR, WHICH IMPROVE, MENTS ARE ALSO APPLICABLE FOR GRINDING WHEAT AND OTHER GRAIN
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Thomas Frederick Hind and Robert
Lund at the Office of the Commissioners of Patents on the 4th March
1878.
THOMAS FREDERICK HIND and ROBERT LUND, both of Preston, in the County
of Lancaster, Corn Mill Engineers. * IMPROVEMENTS IN MACHINERY OR APPA-
RATUS FOR GRINDING OR REDUCING MIDDLINGS INTO FLOUR, WHICH IMPROVE,
MENTS ARE ALSO APPLICABLE FOR GRINDING WHEAT AND OTHER GRAIN."
This Invention relates to improvements in machinery or apparatus for grinding
or reducing middlings into flour, which improvements are also applicable for
grinding wheat and other grain.
We employ two millstones or discs arranged vertically, the one being secured to
a horizontal shaft or axis so as to rotate therewith, and the other being stationary.
The grinding is effected between the juxtaposed vertically arranged surfaces of the
two stones or discs. The stones or discs are enclosed in a case or box of metal
formed in halves jointed together. Within one half is fitted the stationary stone
or disc, suitable setting up or adjusting screws being provided for holding it in
position. The other stone or disc is within the other half of the box, within which
it rotates.
The horizontal shaft is supported in end bearings or journals arranged externally
of the two halves of the case or box. The half case containing the rotary stone or
disc has at its side two bearings, between which is the driving pulley.
The stationary stone or disc has a central aperture, through which the shaft
passes. This aperture is somewhat larger than the shaft, and is lined with a tube
or shell of metal, and the material to be treated is fed through a suitable opening
to this central aperture. Upon that portion of the shaft which is within this central
aperture are fixed wings or beaters, which may be formed like the curved line in
the thread of a quick screw; they facilitate the passage through the central aperture
of the material to be treated, dash or distribute it between the two stones or discs,
and act as a fan.
The outer of the two end bearings or journals at the rotating stone or disc side
of the case forms a resistance or thrust box, and is provided with a slide and

page_text: setting-up screw that the position of the two stones or discs may be readily
adjusted. The other end of the shaft is capable of being withdrawn endwise from
its bearing for purposes herein-after referred to.
Each of the two portions of the apparatus above described, that is to say, the
one half or side of the case or box containing the rotating stone or disc with the
shaft, stone, or disc, and bearings in connection therewith, and the other half con-
taining the stationary stone or disc with the remaining end bearing is supported
upon blocks, which also form pivots. These pivot blocks slide upon the upper
⚫ edges of stands forming the sides of the machine, and each of these stands is
provided with screws, so that the two stones or discs and corresponding portions of
the machine may be withdrawn from each other, and turned over from a vertical
to a horizontal position:
It will be evident the arrangement above described will permit of the re-dressing
the stones or discs without disturbing the working pafts of the machine.
Holding-up screws are provided for sustaining the weight of the rotating stone
or disc when turned over, thereby preventing undue pressure upon the end bearing
or thrust box.