IMPROVEMENTS IN CRUSHING OR GRINDING MILLS to be as follows:
Year: 1885

page_text: I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, & Co, Patent Agents
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for "IMPROVEMENTS IN CRUSHING OR GRINDING MILLS
to be as
follows:-
"
This invention relates to what are known as Chilian mills, that is to say,
crushing or grinding mills in which the stones or rollers are suspended from a
cross bar or beam fixed upon a vertical shaft.
The present improvements are chiefly designed to be applied to mills for crushing
or grinding gunpowder.
In mills of this class, the stones or rollers are usually suspended from the cross-
beam by means of rods or bars which are provided with screw-nuts whereby they
can be adjusted to cause the stones or rollers to approach or raise them from the
surface of the bed-plate. The stones or rollers are supported upon what are termed
drag-cranks, that is to say each stone turns upon a separate axis forming the pin
of a crank fixed on a shaft supported in a cross-head; each stone can therefore be
raised or lowered independently of the other, the said axis or pin, in this movement,
describing an arc around the said shaft.
In mills of this class as heretofore used, the suspension of the stones is effected
by making each of the suspension rods or bars with an eye which encircles a
projecting bush fastened by keys in the nave of the stone, which bush rotates with
the stone when the latter is rolled upon the gunpowder or other material to be
crushed or ground. The result of this construction of the parts is that as sɔon
as the suspending device comes into operation, that is to say, as soon as the stone
is carried by the suspension rod, considerable friction is produced, which, under
certain circumstances, prevents the stone from turning further upon its shaft whilst
carried by the suspension rod, and which frequently prevents the immediate com-
mencement of the rolling motion when the stone again presses upon the material

page_text: to be crushed or ground, so that the said stone carries or pushes the entire mass
before it.
According to the present invention, the suspension rods are arranged to encircle
ings or bushes which are fixed upon the axes or shafts carrying the stones or
rollers and do not turn with the said stones or rollers. By constructing the parts
in this manner,
the above mentioned defects are obviated, so that the stone rolls
on to the mass without any difficulty, instead of carrying or pushing the same
before it.
In some cases the said rings or bushes are dispensed with and the suspension
rods are arranged to encircle or otherwise hold the said shafts or axes.
Dated this 17th day of Marah 100%
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, 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:-
This invention relates to crushing or grinding mills of the class known as
"Chilian Mills," in which the stones or rollers are fitted to rotate upon horizontal
shafts or axles and are suspended from a cross bar or beam carried by a vertical
shaft.
The said invention is chiefly designed to improve the construction and increase
the efficiency of mills such as are used for crushing or grinding gunpowder.
In the accompanying drawing.
Figure 1 is a side elevation, partly in vertical central section, and
Figure 2 a horizontal section, of one of these mills.
Figure 3 is a vertical central section, drawn to an enlarged scale, showing details
of construction.
a, a are the stones or rollers, which are suspended from the cross-beam 6 by
means of rods or bars c provided with screw-nuts c¹, whereby they can be raised
or lowered to adjust the height of the stones or rollers relatively to the bed-
plate d.
The stones or rollers a are fitted upon what are termed "drag-cranks," that is
to say, each stone turns upon a separate axle e¹ which constitutes the pin of a
crank e fixed or formed on a shaft e². The shafts e² are supported in a cross-
head carried by the vertical shaft g. The said stones or rollers are, therefore, free
to rise or fall independently of each other, each axle or pin e¹, in the upward or
downward movement of the stone or roller fitted thereon, moving in the arc of a
circle the centre of which is the centre of the corresponding shaft e².
In mills of this class as heretofore constructed, the suspension of the stones is
effected as follows, that is to say, each suspension rod or bar is formed with an eye
which encircles a projecting bush or sleeve fixed by means of keys in the nave or
hub of the stone, which bush or sleeve rotates with the stone, when the latter rolls
upon the gunpowder or other material to be crushed or ground. The result of this
construction of the parts is that, whenever the weight of the stone is borne by its
suspension rods, considerable friction is produced between the said eyes and the
bushes or sleeves. This friction, in some instances, prevents the turning of the
stone upon its shaft whilst carried by its suspension rods, and frequently delays
or retards the recommencement of the rolling motion to such an extent (when
the stone, after having been carried by the suspension rods, again presses upon the
material to be crushed or ground) that the said stone carries or pushes the entire
mass of such material before it, instead of crushing or grinding the same.
In carrying the present invention into practice, the suspension rods c are made
with eyes c which encircle bushes or sleeves h; but these bushes or sleeves are
fixed upon the axles e¹ of the stones or rollers a, and do not turn with the said

page_text: stones or rollers, that is to say instead of the bushes or sleeves being fixed in the
stones or rollers, and rotating therewith as heretofore, they are stationary and
the stones are fitted to rotate upon them. By constructing the parts in this
manner, the above-mentioned defects are obviated, and the friction is greatly
diminished, so that the stones can freely rotate on their axles and will roll upon
the mass to be crushed or ground instead of carrying or pushing the said mass
before it as above described.
Antifriction rollers i are, if desired, placed between the said stones a and the
bushes or sleeves h.
The eyes c² of the suspension rods c are sometimes arranged to encircle the
axles e¹, as shown at the right hand side of Figure 3. Or the said suspension rods
are otherwise so constructed and arranged that they will support the said axles.
If desired, the said bushes or sleeves can be dispensed with.
It is obvious that the above described improvements are applicable to mills for
crushing or grinding other materials than gunpowder.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to
me by my foreign correspondent, I declare that what I claim is
The above described improvements in crushing or grinding mills, whereby I
provide for diminishing the friction and enabling the stones or rollers to freely
rotate on their axles, as, and for the purpose, specified.
Dated this 17th day of Decembar 100%