IMPROVEMENTS IN APPARATUS FOR RAISING OR HAULING WEIGHTS
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by Edward Bayzand Ellington at
the Office of the Commissioners of Patents, with his Petition, [on
the 18th December 1875.
I, EDWARD BAYZAND ELLINGTON, of No. 14, Delahay Street,
Westminster, in the County of Middlesex, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN APPARATUS FOR RAISING OR
HAULING WEIGHTS," to be as follows:--
My Invention relates to that description of apparatus for raising or
hauling weights, wherein a sheave receiving longitudinal motion by a
hydraulic ram or other source of motive power imparts such motion to a
chain passing over it, one end of the chain being fixed, while the other
end after passing over one or more fixed sheaves is either connected to
the object to be raised or hauled, or imparts motion to a drum on which
the hauling chain is coiled.
My present Invention has for its object an improved arrangement,
whereby two or more different speeds may be imparted at will to the
hauling rope, chain, or band, with one and the same speed and extent
of travel of the hydraulic ram or other apparatus. For this purpose I
mount on the end of the hydraulic ram or other apparatus by which

page_text: motion is imparted, two sheaves of different diameters revolving inde-
pendently of each other, over which sheaves pass two chains, ropes, or
by preference, flat bands. The one end of the band passing over the
smaller sheave passes through a fixed slot, below which it has a weight
or stop attached to it, while the other end is fixed to and coiled upon the
periphery of a sheave or drum fixed on the same axis with another
sheave or drum of smaller diameter. To the periphery of this latter is
attached and on it is coiled the one end of the second band passing over
the larger travelling sheave, the other end of this band having a stop
attached to it and being arranged in connection with a moveable fork,
which can be brought into position either so that the stop on the band
must come in contact with it, and thus the further motion of that end
of the band be prevented, or the fork may be moved so that the band is
free to travel past it. A drum with the hauling chain coiled upon it
being fixed on the same axis with the before-mentioned drums on
which the bands are wound it will be seen from the above described
arrangement that if for raising a small weight it be required to impart
a quick speed to the hauling drum this is effected by bringing the
above-mentioned fork into position so as to arrest the one end of the
band passing over the larger travelling sheave and smaller drum,
whereupon this band will be brought into action for rotating the
hauling drum. As the length of band thus drawn off the smaller drum
during one revolution will naturally be less than the length of the other
band, which is at the same time delivered from the larger drum, it
follows that the free end of this band instead of being drawn by the
motion of the travelling sheaves will be slacked out, and consequently
the stop, upon it will not interfere with the action of the apparatus; if
on the other hand a slower motion requires to be imparted to the
hauling drum for raising a heavy load, this is effected by throwing the
before-mentioned fork out of gear with the band passing over the larger
travelling sheave so that it is deprived of its purchase, whereupon the
band passing over the smaller travelling sheave and larger drum will be
brought into. action by the stop on the free end thereof coming in
contact with the before-mentioned fixed slot.
Although I have spoken of the "larger" and "smaller" travelling
aidant that it in and

page_text: Also, although I have spoken of only two sets of sheaves and drums,
yet three or more such sets of different sizes may be used if it be
desired to have more than two different speeds. In this case it may be
advisable to carry the set of travelling sheaves on a cross head
connecting two hydraulic rams or other motor apparatus arranged side
by side, so as to avoid a side strain that would otherwise be put on the
single ram, or for the same purpose one of the sheaves may be mounted
in the middle, and the others in duplicate mounted symmetrically on
each side of the middle.