Improvements in Shaker Screens.
Year: 1899

page_text: Date of Application, 12th Dec., 1899-Accepted, 17th Feb.,
1900
Improvements in Shaker Screens.
I, HAMMERSLEY HEENAN, of the Firm of Heenan and Froude, Engineers, of
4, Chapel Walks, Manchester, in the County of Lancaster, and of Aston Lane,
Aston, in the County of Warwick, 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 consists of improvements in shaker screens for colliery and other
services, my object being to construct a very compact, convenient, and efficient
mechanical screen for the expeditious sorting of coal or other material into the
required sizes.
The accompanying sheet of explanatory drawings, to be hereinafter referred
to, represents a shaker screen constructed and arranged in accordance with my
invention.
Figure 1 is an elevation, and Figure 2 a plan of the screen, the same reference
letters in the two views indicating the same parts.
Figure 3 is a diagram representing the form of motion in a vertical plane
imparted to the screen.
The body part A of the screen is formed of steel plates, suitably stiffened
where necessary, and is suspended by the jointed or pivoted rods as B B
and C C¹ from suitable supports. Three perforated decks or screens are provided
at levels 1, 2, and 3, respectively, the said decks or screens being open at each
end.
From the deck or screen 3, the fine portion of the material passing through
such screen drops on to the inclined plates 4 and 4ª and falls through the
bottom opening or outlet 5.
A combined horizontal and vertical reciprocating motion is imparted to the
screen from me crank shaft D which is driven in any ordinary manner. The
rods EE connected with the crank shaft D at one end and the shaft Fon
the screen body at the other end, are respectively pivoted at the lower ends of the
rods G G swinging from the supporting shaft H. On the same shaft H the
balance levers JJ are mounted, the screen body supporting rods C C¹, herein-
before referred to, being jointed to the said levers JJ as shown.
By arranging the supports and driving connections in the manner described
and illustrated, I am enabled to impart such a continuous combined horizontal
and vertical reciprocating motion to the machine as will effectually screen the
material, but at the same time avoid shock or jerk on the reversal of motion at
the end of each stroke of the crank connecting rods E EL
The continuous curve shown in the diagram, Figure 3, represents the line of
motion of the screen at its point of connection with the crank connecting
rods.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1 In shaker screene
the arrangement of the supporting and driving con-

page_text: nections whereby with the avoidance of shock an effective screening motion is
imparted to the machine, substantially as described.
2. In machines for screening coal and other material the combination with
the screen body of driving mechanism composed in part of a rod as E jointed
at one end to a rotatable crank shaft, at the opposite end to the screen body, and
at a point between such ends with a swinging arm as G, substantially as
described and as illustrated.
3. An improved shaker screen constructed and arranged substantially as
described and as illustrated.
CHOCT 1
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester,
Agents for the Applicant.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester,
Agents for the Applicant.