The Mechanical Handling and Storing of Material
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
Søgning i bogen
Den bedste måde at søge i bogen er ved at downloade PDF'en og søge i den.
Derved får du fremhævet ordene visuelt direkte på billedet af siden.
Digitaliseret bog
Bogens tekst er maskinlæst, så der kan være en del fejl og mangler.
272
THE MECHANICAL HANDLING OF MATERIAL
Fig. 396. Otto Coupling.
As soon as one of these knots approaches the coupling it lifts the fangs of the bolt d
and slides underneath, its progress being arrested by the fangs of bolt e. The spiral
spring replaces the fangs of bolt d, so that the coupling and carrier must now travel
with the rope. The
hook f is connected
with the pawl g, and is
for the purpose of un-
coupling the carrier.
Another construc-
tion for the same con-
ditions is that of Eiligen
shown in Fig. 3 9 5.
This consists of the
frame b, roller c, and
catches d, which latter
are the chief features of
the coupling. They are
arranged on either side
of the roller e •, in the
illustration these are
shown in the lowest
position, as they rest
upon each other at e,
the rods f engage with
a short length of rail at the stations and thereby lift the catches, thus uncoupling the
rope as shown in the lower picture. The uncoupling process is similar to that of the
previously described appliance.
Owing to the insecurity of some of the knots on the rope, and the great wear on
both sides of the knots caused by these
couplings, it was realised that their em-
ployment did not solve the difficulty in
the best and most economical way, and
further efforts were made to design such a
coupling as would give sufficient grip for
steep inclines and heavy loads without the
use of knotted ropes.
Theodore Otto abandoned the eccen-
tric principle for these couplings in 1877
and introduced a gripping device on the
screw-vice principle. It would occupy too
much space here to explain why this
screw device was not introduced before,
but the chief difficulty was that a certain
clearance between the gripping device and
the rope was always necessary; and to close the jaws when sufficiently far apart until a
sufficient grip was obtained, the coupling lever would have to traverse a larger segment of
a circle for a screw device than for an eccentric device (the latter takes less than 90°),
and if so short a movement of the tightening lever is chosen for a screw device, the
pitch of the screw has to be so steep that there is a danger of its coming undone through