Improvements in Edge-runner Mills for Crushing Clay and the like.
Year: 1899

page_text: Date of Application, 13th July, 1899-Accepted, 18th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in Edge-runner Mills for Crushing Clay and the like.
I, JACOB SCHMIDHEINY, of Heerbrugg, in the Canton of St. Gallen, Switzerland,
Engineer, do hereby declare the nature of this invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
-
Hitherto for crushing material in a wet or dry state besides rollers very often
single or superposed edge-runner mills were employed in which the bottom of the
pan or tray was provided with slots. The durability and the capacity of these
mills was, when material as clay, loam or the like were treated, very deficient,
for the reason that these materials in most cases are treated in a wet state.
The purpose of the present invention is to provide an apparatus by means of
which the finest possible crushing of the clay, loam or the like is possible. This
purpose is attained by perforating the bottom of the pans or trays of a series of
vertically superposed edge-runner mills. The wet clay to be crushed and to be
mixed during the operation is pressed in small strips (hands) through the per-
forations of the bottom plate of the pan or tray of one of the edge-runner mills
down to the next following without the assistance of an especial transporting
mechanism. The thin strips when falling upon the second mill are superposed
and mixed together and pressed by the edge-runner of this second mill. the stones
being crushed to such a degree as to be able to pass through the perforated pan
bottom plate of this second mill into the third and lowest mill, the perforations
of the bottom-plate of the second mill being smaller than those of the first one.
In this manner it is possible not only to thoroughly crush the stones contained
within the clay, but also to obtain an effective mixture of the whole material.
In order to render my invention more clear I beg to refer to the accompanying
drawing in which similar letters denote similar parts.
Fig. 1 illustrates a vertical section through my improved clay-crushing mill.
Fig. 1 is a detail view of the scraper.
Fig. 2 illustrates a top view of the grate-like formed bottom plate of the pan
of an edge-runner mill.
Fig. 2 a vertical section through Fig. 2.
When motion is given to the horizontal shaft a the same is communicated to a
vertical shaft 6 by means of bevel wheels; the edge runners cel c² of the vertically
superposed edge-runner mills are rotatably connected by the same shaft b.
The arrangement of the mill is the usual one but opposite to the edge-
runners cc, are provided scrapers s rotatable around the axles ; these scrapers
move upon
the pan bottom and are weighted by means of weights g. Owing to
this weight the scrapers will constantly remain at a certain height above the sur-
face of the grated bottom r but the complete descent is prevented by means of the
stop or finger n. A water supply tube to leads to a ring tube w¹ situated above
the first edge-runner mill. By means of this tube and the ring w¹ the material
can be constantly moistened.
The pan bottom of the mill consists of cast iron bars like grate bars as clearly
to be seen in Fig. 2 and Fig. 2ª. The material pressed through the openings of

page_text: the said grate falls down through the funnel k to the next mill located vertically
below the first one and so on.
The working of the mechanism is the following;
The material introduced into the first mill is kept moistened by the water flow-
ing through the ring tube w¹. The edge-runner c presses the material against the
pan bottom of the mill, crushes the stones contained within it and presses the whole
through the perforations of the grate r. Thus the clay in thin strips is led down
upon the next mill, the bands falling down one after the other are mixed within
this mill and by the edge-runner c¹ are pressed thoroughly, the stones that may
be contained within the mass are crushed a second time until they are small
enough to pass through the bottom plates of the second mill into the third mill,
where the same process is repeated. In this manner clay, loam and similar
material can be crushed to any desired degree of fineness.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim is:
―:
(1.) In a clay crushing machine the combination of a vertical shaft b edge-
runners cele running in superposed edge-runner mills and rotated by said vertica!
shaft with scrapers s rotatable round a shaft i and running on the pan bottom of
the mills, a weight g effecting the counterbalancing of the scraper, grates form-
ing the pan bottoms of the mills and funnels & arranged below the mills for the
purpose and substantially as described.
(2.) In a clay crushing machine the combination with superposed edge-runner
mills of the usual kind of the perforated pan bottom plates 1.
Tatod this 13th dox of T1 1900
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.