Improvements in and relating to Rope Pulleys.
Year: 1893

page_text: Date of Application. 4th Feb., 1893-Accepted, 11th Mar., 1893
COMPLETE SPECIFICATION.
Improvements in and relating to Rope Pulleys.
I, WILLIAM NEWBY COLAM, of Billiter Buildings, in the City and County of
London, Civil 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 invention relates to an improved jaw for rope pulleys and to an improved
method of constructing the same, the object being to maintain an equal grip on the
driving rope during the whole life of the jaw, to do away with a number of wraps
and drive with one pulley only and at the same time to minimize the wear and tear
on the driving rope.
I attain this end by constructing the jaw of the pulley in the manner illustrated
by the accompanying drawings, in which
Figure 1 is a broken view in side elevation of a grip pulley embodying my
invention.
Figure 2 is a broken view in cross section--on an enlarged scale-of the jaw of
the pulley, and
Figure 3 is a broken view in cross section showing the method of casting the
white metal faces of the jaw in situ.
Throughout the views similar parts are marked with like letters of reference.
The pulley has formed in its periphery a jaw A in which are fitted blocks B, B,
forming its wearing faces. These blocks are so shaped that they make the gripping
jaw of a Y-shape in cross section, the bottom part of the jaw having parallel sides
and being of a width proportionate to the diameter of the rope X. The amount of
shoulder which is determined by the width of the parallel part of the jaw-is thus
maintained until the rope reaches the bottom of the jaw.
I prefer to make the blocks B, B, forming the wearing faces of the jaw of white
metal which I cast in position by the device illustrated by Figure 3, by which
arrangement the skin of the white metal is not destroyed and the life of the jaw
thereby materially increased. In casting the blocks B in position I employ a
casting segment C which has at its bottom a tongue c adapted to accurately fit and
slide in a recess a at the bottom of the jaw A, the said recess being turned true
when the pulley is in the lathe. Small holes b, b, are provided in the sides of the
jaw A of the pulley to allow the air to escape when the white metal is being
moulded in situ, pieces of clay being put over the said holes when pouring. The
white metal which protrudes through the holes b, b, etc. is rivetted over, and assists
to keep the blocks B, B, in position. When one set of blocks are moulded the
casting segment is moved round in the jaw of the pulley and the next ones moulded
and so on until the whole are completed. Strips of metal D are fixed to the edges
of the jaw of the pulley by screws or bolts d, which further secure the blocks B, B,
in position and prevent their moving in their places.
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 :-
1. The improvements in and relating to grip pulleys, as hereinbefore describe
and illustrated by the accompanying drawing.
5 2. In a grip pulley, making the jaw of a Y-shape in cross section so that the
amount of shoulder forming the grip remains constant throughout the life of the
jaw, or the blocks thereof, as set forth.

page_text: 3. In a grip pulley, moulding the blocks forming the wearing faces of the
jaw in situ, as and for the purpose set forth.
Dated this 4th day of February 1893.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.