An Improved Lime-grinding Mill.
Year: 1891

page_text: Date of Application, 26th May, 1891-Accepted, 27th June, 1891
שו שות VII
DI BUITIATION.
An Improved Lime-grinding Mill.
J...
I, JOSEPH JAMES MEAD, of Midelucy, Curry Rivel, in the County of Somerset,
Lime Merchant, 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, which consists in an improved mill for grinding lime, relates more
particularly to the screen therein through which the lime is discharged from the
grinding pan. According to this invention the screen is composed of steel or
wrought iron bars laid radially in the bottom of the revolving pan in which the
lime is crushed by the usual rollers. Each screen-bar has at one side suugs
projecting from the body of the bar.
The other side of the bar is devoid of such projections. The bars are so arranged
that the snugs or projections of one hear against the plain side of the other. Thus
throughout the circular screen, apertures are presented extending in each from one
snug or projection to the next. The plain side of each bar is approximately vertical.
At the opposite side each bar is tapered towards the bottom, and by virtue of this
the apertures aforesaid increase in width from the top downwards. Accordingly,
the passage of the ground lime through the screen is facilitated and clogging is less
liable to occur.
The bars, which are supported at each end on a shelf; are kept in
place by rings bolted to the pan in which the lime is ground. The bars are readily
removed and replaced. Below the pan in which the lime is ground is a second pan
into which the screened lime is received.
From the lower pan the lime is discharged through a shute or shutes into sacks
or other receptacles.
Referring to the accompanying drawings, Fig. I thereof represents a vertical
section and Fig. 2 a part plan of a lime-grinding mill constructed in accordance with
my invention. At the bottom of the pan a which rotates with the spindle and
which contains the usual grinding rollers c, are bars d, of steel or wrought iron,
arranged radially as shown, and supported at each end on shelves provided for them
in the pan. The bars are held in place by the rings e laid over their ends and
secured to the pan by screws or bolts.
The bars are readily removed and replaced.
Projecting at intervals from one side of each bar, as seen in the enlarged side
elevation Fig. 3 and plan Fig. 4, are snugs or distance pieces i by which the general
bodies of the bars are kept apart, the bars being in contact only at the said snugs
or distance pieces . The series of bars thus present a succession of apertures
extending from one distance piece to the next, and, accordingly, a screen is
constituted for screening the lime, through which screen the lime passes to the pan k
below.
i
As will be seen by reference to the cross section Fig. 5, that side of each bar at
which the projections are situated is inclined towards the opposite side which is
approximately vertical. Consequently, the screening apertures increase in width
from the top downwards. The passage of the lime through the screen is thus
facilitated and clogging rendered less liable to occur.
In the grinding pan a are, as is usual, scrapers or guides for directing the lime
below the grinding rollers c.
In the lower pan k are similar scrapers or guides for directing the lime into
hates for delivery into sacks, bags or other suitable receptacles.

page_text: 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 :-
1. In a lime-grinding mill, a screen for sifting the lime, consisting of a series of
separate bars such as d arranged radially in the bottom of the grinding pan and
above a receiving pan, said bars having one side smooth or plain and approximately
vertical, the other side being inclined downwards towards the smooth side and
furnished with snugs or projections such as i whereby apertures are provided for
the passage of the crushed lime to the receiving pan below, substantially as
herein before described with reference to the accompanying drawings.
2. The combination of parts constituting the improved lime-grinding mill,
constructed and arranged substantially as hereinbefore described and for the
purposes set forth.
Dated 10:41 1. f 100L
NICHOLAS WATTS,
Bristol Bank Buildings, Bristol,. Agent.