Improvements in Grinding Mills.
Year: 1896

page_text: Date of Application, 2nd Oct., 1896
Complete Specification Left, 15th Apr., 1897-Accepted, 29th May, 1897
Improvements in Grinding Mills.
I, EDMUND ERNEST BENTALL, of Heybridge, near Maldon, in the County of Essex,
Agricultural Engineer, do hereby declare the nature of this invention to be as
follows:-
The present invention has reference to mills for grinding grain and other substances,
the grinding surfaces of which consist of a pair of plates or stones, one of which is
fixed, while the other rotates, being mounted on a rotating horizontal shaft.
The grinding surfaces of these plates or stones are frequently conical, or are
provided with serrations arranged concentrically and correspondingly, so that the
surfaces engage together, and interlock, during the process of grinding.
Should the rotating plate, or its spindle, become out of truth with the fixed grinding
surface, it is obvious that the interlocking cones or serrations will not be truly in
contact, and will cause the mill to produce a coarse sample of meal, instead of a
fine flour.
The object of my invention is to provide means for rectifying this defect, should it
arise, and accordingly I not only enable the movable surface to oscillate, so as to bring
itself into a level acting position with regard to the fixed surface, but I also provide
for its adjustment towards the centre, so as to allow the cones, or concentric rows of
serrations, to remain in true engagement during the operation of grinding, notwith-
standing any obliquity that may perchance arise in the mounting of the rotating
plate.
In carrying out my present invention, I interpose between the rotating grinding
plate and its driving spindle or shaft, a species of universal joint, in the following
manner :-
On the back of the plate, which is loose upon its spindle, are lugs which engage
with corresponding recesses in the end of a collar, which loosely embraces the driving
shaft. The shaft within the said collar is fitted with a transverse pin, the ends of
which engage with holes pierced in the collar, in a line at right angles to the line of
the recesses before mentioned, thus forming, with the latter, a double or universal
joint. The arrangement is such, that while the grinding plate continues to be rotated
by the spindle acting through the collar on the lugs or projections on the plate back,
there is sufficient play in the above double arrangement of joints to permit of oscilla-
tion, and also of adjustment centrally, to maintain the acting surfaces constantly in
efficient operative position.
Dated thin and day of October 1896
NEWTON & SON,
Agents for the Applicant.

page_text: Improvements in Grinding mills.
I EDMUND ERNEST BENTALL of Heybridge near Maldon, in the County of Essex,
Agricultural 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:-
The present invention has reference to mills for grinding grain and other substances,
the grinding surfaces of which consist of a pair of plates or stones, one of which is
fixed, while the other rotates, being mounted on a rotating horizontal shaft.
The grinding surfaces of these plates or stones are frequently conical, or are
provided with serrations arranged concentrically and correspondingly, so that the
surfaces engage together, and interlock, during the process of grinding.
Should the rotating plate, or its spindle, become out of truth with the fixed
grinding surface, it is obvious that the interlocking cones or serrations will not be
truly in contact, and will cause the mill to produce a coarse sample of meal, instead of
a fine flour.
The object of my invention is to provide means for rectifying this defect, should it
arise, and accordingly I not only enable the movable surface to oscillate, so as to
bring itself into a level acting position with regard to the fixed surface, but I also
provide for its adjustment towards the centre, so as to allow the cones or concentric
rows of serrations to remain in true engagement during the operation of grinding,
notwithstanding any obliquity that may, perchance, arise in the mounting of the
rotating plate.
In carrying out my present invention, I interpose between the rotating grinding
plate and its driving spindle or shaft, a species of universal joint, after the manner
indicated in the accompanying drawing, wherein I have shewn a portion of a mill
sufficient to illustrate my present invention.
In this drawing :-
Fig. 1 is a sectional elevation;
Fig. 2 is a plan of the rotating plate attachment;-and
Fig. 3 is an end viow of the attachment, with the plate removed.
A is a fixed grinding plate or stone, and B is a rotating plate, both being corre
spondingly provided, on the face, with concentrically arranged interlocking projections
or serrations. C is the driving shaft or spindle.
On the back of the plate B, which is loose upon its spindle C, are lugs bb, which
.engage with corresponding recesses d d in the end of a collar D, which loosely
embraces the driving shaft C. The shaft C, within the said collar, is fitted with a
transverse pin c, the ends of which engage with holes e e pierced in the collar, in a
line at right angles to the line of the recesses before mentioned, thus forming with
the latter a double or universal joint. The arrangement is such that, while the
grinding plate continues to be rotated by the spindle C, acting through the collar D
on the lugs b b on the plate back, there is sufficient play in the above double arrange-
ment of joints, to permit of oscillation, and also of adjustment centrally to maintain
the acting surfaces constantly in efficient operative position.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In mills provided with grinding plates or stones having concentrically arranged
conical or serrated faces, the means above described for rectifying the effect of

page_text: obliquity in the driving shaft, and thereby ensuring true engagement and efficient
action between the grinding surfaces, substantially as set forth.
11007
NEWTON & SON,
Agents for the Applicant.