Overhead Cranes.
Year: 1892

page_text: Date of Application, 10th Sept., 1892
Complete Specification Left, 5th June, 1893-Accepted, 8th July, 1893
PROVISIONAL SPECIFICATION.
Overhead Cranes.
I, GEORGE RUSSELL, Alpha Works, Motherwell, Lanarkshire, North Britain
Engineer, do hereby declare the nature of this invention to be as follows:-
The object is, in overhead cranes, where flexible metal rope is used instead of
chain for lifting the load, to arrange the pulleys so that reverse bending of the
rope is avoided, and that the moveable block may ascend close to the upper pulleys,
and so obtain the utmost available head room.
According to one modification, as applied to an overhead travelling crane; an
arrangement of double purchase, with four parts or stretches of rope between
block and upper pulleys is as follows:-
There are two pulleys on the block set at an angle to each other horizontally;
that is, the edges are closer together at one side than the other. There are four
pulleys above on the crab, all parallel to each other, and may be on same spindle.
The two inner pulleys are set apart, the same distance as the closest side of
pulleys on block; and the two outer pulleys same distance apart as the widest side
of pulleys on block. The rope is doubled over a fixed pulley at end of bridge,
passes over, either the two outer, or the two inner pulleys on crab, then under the
two pulleys on block, over the other two pulleys on crab, and thence to the barrel,
where it is wound on at both ends of the rope. If only one end of rope is wound
on barrel, and other part fixed, the arrangement is quadruple purchase.
Dated this 9th day of September 1892.
GEO. RUSSELL.
COMPLETE SPECIFICATION.
Overhead Cranes.
GEORGE RUSSELL, of Alpha Works, Motherwell in the County of Lanark,
North Britain, 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 :-
My said invention has for its object, in overhead cranes, where flexible metal
rope is used instead of chain for lifting the load; to arrange the pulleys so that
reverse bending of the rope is avoided, and that the moveable block inay ascend.
close to the upper pulleys, and so obtain the utmost available head room.
According to one modification, as applied to an overhead travelling crane; an
arrangement of double purchase, with four parts or stretches of rope between
block and upper pulleys, is as follows.―
DESCRIPTION OF DRAWING.
There are two pulleys on the block A, A, set at an angle to each other
horizontally; that is the edges are closer together at one side than the other.
There are four pulleys above on the crab all parallel to each other B, B, C, C, and
may be on same spindle. The two inner pulleys B, B, are set apart the same
distance as the closest side of pulleys on block, and the two outer pulleys C, C,
same distance apart as the widest side of pulleys on block. The rope is doubled
over a fixed pulley D at end of bridge, passes over the two outer pulleys C, C, on
crab; then under the two pulleys A, A, on block, over the other two pulleys B, B,
on crab, and thence to the barrel where it is wound on at both ends of rope E. E.
i Q77

page_text: If only one end of rope is wound on barrel, and other end fixed, the arrangement
is quadruple purchase.
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 :-
The arrangement of pulleys and block substantially as herein described, and for
the purposes herein set forth.
Dated this a
L
1009
GEO. RUSSELL.