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
DISCHARGING BY MEANS OF SKIPS AND GRABS 403
of the jaws. The chain is divided before entering the grab, and is attached to the two
drums a and b. Each drum is cast together with a pinion with fifteen teeth, which are
Figs. 570 and 571. Elevation and Cross Section of Jaeger’s Two-Chain
Gear-Driven Grab.
geared to wheels with forty-two teeth, these again being attached to two intermediate
spindles on either side, which are fitted with two pinions of ten teeth each geared into
Fig. 572. Elevation of the Brown Hoisting Machinery Co.’s Two-Rope Grab Bucket.
(The width of the Grab is 5 ft.)
wheels on the jaws, and thus open and close them. The latter are, as a matter of fact,
only segments of wheels, each being about one-third of a whole wheel.
Ihe gearing and the two countershafts are all enclosed in a sheet-iron casing, which
is visible in the illustration, and are therefore protected from grit or any other foreign