Forfatter: A.-M.Inst.C E., George Frederick Zimmer
År: 1916
Forlag: Crosby Lockwood and Son
Sted: London
Sider: 752
UDK: 621.87 Zim, 621.86 Zim
Being a Treatise on the Handling and Storing of Material such as Grain, Coal, Ore, Timber, Etc., by Automatic or Semi-Automatic Machinery, together with the Various Accessories used in the Manipulation of such Plant
VIBRATING OR RECIPROCATING TROUGH CONVEYORS
119.
down by gravity at the
ordinary stroke, this
motion is only about 1
in., whilst when the in-
cline is lessened as the
truck is gradually filled
from the shdot, the
stroke increases auto-
matically until when
level it is as long as
that of the screen. This
diversion in the length
of the stroke is produced
by two levers, one on
each side of the lowering
jib, one end of each of
these levers being hinged
to a sliding block fixed
to the floor, whilst the
other end is guided by
two rocking levers with
slots (the rocking levers
are manipulated by the
screen). These two
levers are connected on
both sides at about the
centre of their length to
the lowering shoot, in
such a way that when
this is steep the ends of
the levers are in the
lowest position of the
slots in the rocking
levers, where the stroke
is short, and as the
shoot is raised the two
lever ends ascend in the
slots of the rockers to
where the stroke is
longer. The lowering
shoot is 20 ft. long, and of
course as wide as the con-
veyor screen from which
it is fed and driven.
The free or delivery end
of this loading device is
supported and adjusted
by a small winch, a wire
rope, and balance weight.
Figs. 162 and 163, Weiss Feeding Appliance in connection with Reciprocating Conveyors.