Year: 1895

page_text: Date of Application, 6th Aug., 1895-Accepted, 14th Sept., 1895

page_text: flying off. is a scraper secured to the lower stone near the meal outlet through
which the meal is thus uniformly forced.
In order to prevent the mill becoming hot and the stones getting dull, as also
the meal becoming too hot, it is absolutely necessary that the upper running stone
is kept in the true horizontal position.
To effect this, the mill spindle is mounted above the running stone and below the
bottom stone between adjustable wedges, which wedges are acted upon through the
medium of the running stone b until the mill spindle regains its true vertical
position. For this purpose standards k, kl, crossing each other, are bolted to the
table e and thus support the bearings for the upper free end of the mill spindle a.
Such bearing consists of a chamber closed by the upper and lower plates 12
through whose centre openings extends the end of the mill spindle a. Readily
exchangeable wedges m made of any suitable hard wood, metal or the like, rest
with their straight vertical sides against the mill spindle while their opposite oblique
sides are acted upon by correspondingly-shaped chocks n which may be moved up
and down by means of screw-spindles provided with rings o¹ for preventing
vertical displacement and passing through correspondingly screw-threaded
projections n' of the chocks n.
The spindles o are rotated by the toothed wheels o mounted on the ends of same
and engaging with a rack p₁ forming part of frame p, the socket p* of which latter
is screw-threaded for engaging with the spindle y rotatably mounted on the
standards k, k. For each two opposite adjusting wedges m, is provided a spindle g
for effecting the uniform movement of the correspondingly-shaped wedges, which
thus keep the mill-spindle in the vertical position. When four wedges are used
the screw-spindles y preferably cross each other at right angles, while the frame p
and rod p are above each other; the screw spindles o for the higher rack p
engaging with wheels o, are correspondingly higher than the other spindles, as
shown in Figs. 1 and 4 of the drawings.
The arrangement of the second and lower bearing for the mill-spindle a is exactly
the same as the upper one; as will be seen in Fig. 1 the corresponding parts are
represented by capital letters. The transmission of the motions of the spindles Q,
operating the adjusting wedges to the spindles 7 of the upper bearing is effected by
bevel-wheels mounted at the ends of such spindles and communicating with each
other by means of vertical shafts likewise provided with bevel wheels.
In order to effect the automatic operation of the spindles 7, Q so as to cause the
mill-spindle a to maintain its vertical position, the upper running stone is provided
with a striker 8, which comes in contact with a lever t, when the stone b is not
exactly horizontal.
As shown in Fig. 6 the lever t pivoted to a frame t' bolted
underneath the standards k, k is also pivoted to a pawl u having oblique slot u
in which engages the pin u³ of frame t'. The pawl u engages with ratchet-wheel v
keyed onto the spindle q, hence when the arms strikes the lever t on account of
the upper stone not being horizontal, the pawl u rotates the wheel and the
spindle in the directions shown by the arrows in Figs. 6 and 7. The teeth of
the wheels & mounted at each end of the spindles g are oppositely arranged and
thus the latter are rotated in opposite directions (Figs. 6 and 7).
The arrangement of the strikers on the upper running stone bas also of the
levert is such that they do not come in contact with each other when the stone b
is perfectly horizontal, but immediately the stone loses that position .e. when the
mill spindle is not exactly vertical, the strikers and levert come in contact with
each other at that side of the stone which is raised. It will be evident that the
strikers and the levert may be provided with small wheels for reducing the effect
of the contact. The lower mill spindle bearing may in some cases be dispensed
with where the upper adjusting bearing suffices; it is however essential that the
mill spindle passes through the whole mill. It has been found preferable to employ
four adjusting wedges, although it will be evident that the number and arrangement
of same may be varied to suit certain cases or conditions, without departing from
the spirit of this invention.

page_text: Figs. 9 and 10 show the method of employing the stone trimmer A which is
inserted between the upper and lower stones. To permit of the upper stone being
raised sufficiently to admit the trimmer, the roller on the strikers is removed,
when the end of 's (Fig. 9) comes in contact with the lever t in the manner above
described and thus maintains the horizontal position of the mill-spindle.
As shown
the
in Figs. 9 and 10 the trimmer A, of cast steel or the like, is secured to the bed-
stone by means of two bolts C and the connecting part B, the one bolt passing
along the outside of the stone f and the other through the eye in same;
dressing or trimming face of the trimmer A is thus brought to bear on the
running stone b.
For trimming the lower stone fa similar arrangement A¹, B', C¹ is secured to
same as shown in the left of Figs. 9 and 10. The parts c, care removed for
admitting the bolts C₁ through the eye in the stone, or the bolts may be passed
obliquely between such parts. Moreover it will be evident that the parts i, b¹
and f (Fig. 1) must be removed before the trimmer can be attached.
It will be evident that by means of such trimmer not only a true face is obtained
but that also the faces of the stones may be made to incline more or less according
to the nature of the material to be ground; for instance in grinding rough material,
a broader radially-tapering opening near the eye may be formed. Furthermore
the trimmer may be set either radially or, for instance, as shown to the left of
Fig. 10 while the size, shape and the manner of preparing the trimming or dressing
face of the trimmer (i.e. whether same consists of grooves, teeth like projections,
or is provided with a layer of grinding material) are unessential features.
Having now particularly described and ascertained the nature of our invention
and in what manner the same is to be performed, we declare that what we
claim is :-
1. A grinding mill comprising the combination of an upper running stone,
mounted on rhind (a¹) and rotated by the vertical mill spindle (a); a striker (s)
secured to the running stone (b) and striking levers (t) when the upper stone is
not horizontal, spindles (9) operated by pawls (u) of levers (t); racks (p) actuated
by the spindles (9) and engaging with the wheels (03) acting on the chocks and
wedges (n, m) substantially as described and shown in the accompanying
drawings.
2. In combination with a grinding mill having an upper running stone and a
vertical mill spindle, a striker (s) levers (t) with the pawls (u), wheels (v)
mounted on spindles (9) and actuated by said pawls (u), substantially as described
and shown in the accompanying drawings.
3. In combination with a grinding mill with upper running stone and vertical
mill-spindle, wedges (m), chocks (n), spindles (o) on which latter wheels (0)
engaging with racks (p) are mounted, substantially as described and shown in the
accompanying drawings.
4. In combination with a grinding mill with upper running stone and vertical
mill-spindle, a trimmer (A, A') secured to the stones by bolts (C, C¹) and
connecting parts (B, B¹) substantially as described and shown in the accompanying
drawings.
Dated this 6th day of August 1895.
A. F. SPOONER,
124 Chancery Lane, W.C., Agent for the Applicants.