Improvements in or relating to Screens for Stone-breaking and similar Machines.
Year: 1890

page_text: Date of Application, 4th Mar., 1890
Complete Specification Left, 4th Dec., 1890-Accepted, 10th Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in or relating to Screens for Stone-breaking and
similar Machines.
I, SAMUEL JOHN PEGG of 3 Sycamore Lane, Leicester, Iron Founder and Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention has reference to stone-breaking and similar machines and embodies
an improvement in the construction of the screens for the same.
The screens of ordinary construction are made in cylindrical form and of rolled
metal plates. According to my invention I construct the said screens of preferably
cast iron, moulded in perforated segments or in suitably shaped flanged perforated
plates, which may be bolted or otherwise secured together to form a polygonal, tubular
or approximately cylindrical screen or sieve.
The flanged plates or segments may be further held together or strengthened by
suitable end plates and be moulded with baffle plates or equivalent on their internal
faces.
Dated this 4th day of March 1800
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Screens for Stone-breaking and
similar Machines.
I, SAMUEL JOHN PEGG, 3 Sycamore Lane, Leicester, Iron Founder and 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:-
This invention has reference to stone breaking and similar machines and embodies
an improvement in the construction of the screens for same.
Heretofore the screens for the machines mentioned have been constructed in
cylindrical form of wrought iron or steel plates.
This invention has for its object to reduce the cost of the screens and for this
purpose I construct them preferably of cast iron moulded in perforated segments
or in suitably shaped perforated flanged plates, which may be bolted or otherwise
secured together to form a polygonal, tubular or an approximately cylindrical screen
or sieve.
The flanged plates or segments may be further held together or strengthened by
suitable end plates and be moulded with baffle plates on their internal faces to assist
the movement of the stone in the screens.
The invention may be more clearly understood from the accompanying drawing in
which
Figure 1 represents in side elevation part of a screen for a stone breaking or similar
machine.
Figure 2 is a transverse section on the line X X of Figure 1.
Figures 3 and 4 are views illustrating alternative modes of securing the segments
together.
The screen is formed of seginental plates A of cast metal, having flat instead of
curved surfaces and holes or perforations B tapering towards the outside of the plate
so as to admit of being more readily removed from the core or mould.
Each segment is moulded or cast at its ends with angular plates C which are placed
[Price 6d.

page_text: face to face to form screen as shown in Figure 2 and be secured together by bolts and
nuts C¹.
Or as an alternative method of fixing the segments together the bolt may pass
through a Tiron plate, such as D, Figure 3, the cross piece being fixed inside the
screen and in contact with two adjacent segments as shown, or, a channel iron such
as E may be fixed between each segment as shown in Figure 4.
The segments may be cast of any convenient length and in order to admit of a
segment or segments forming a screen with certain size openings or perforations
being secured to a segment or segments with perforations of a larger or smaller size
as represented in Figure 1 the segments are also cast with end plates C2 preferably
at a right angle which are secured together by bolts and nuts C³ as shown most clearly
in Figure 1. The segments may be formed of any size and one obvious advantage of
a screen constructed upon this principle, is, that if any one or more seguients should
be broken accidentally it or they may be readily replaced.
The rotary motion is derived from a shaft F and the screen is supported by radial
legs or bars F¹ in the ordinary manner.
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 stone breaking or similar machine a screen or sieve constructed of segmental
plates such as A of cast metal substantially as described and illustrated in the
accompanying drawing.
2. In a screen or sieve for stone breaking or similar machines the use or employ-
ment of cast metal segmental plates such as A provided with side and end plates such
as C and C2 substantially as and for the purpose described and illustrated in the
accompanying drawing.
3. In a stone breaking or similar machine the combination with a screen or sieve
formed of segmental plates such as A of cast metal, of plates such as D or E
substantially as and for the purpose described and illustrated in the accompanying
drawing.
Dated this 3rd day of December 1890