IMPROVEMENTS IN WINDING GEAR FOR MINES
Year: 1881

page_text: LETTERS PATENT to John Craven, of Wakefield, in the County of York,
Engineer, for an Invention of "IMPROVEMENTS IN WINDING GEAR FOR
MINES."
PROVISIONAL SPECIFICATION left by the said John Craven at the Office of
the Commissioners of Patents on the 24th August 1881.
JOHN CRAVEN, of Wakefield, in the County of York, Engineer. "IMPROVEMENTS
IN WINDING GEAR FOR MINES."
My Invention, relating to improvements in working gear for mines, has for its
objects preventing the great wear in the ropes by one coil chafing against the
other, and obviating the necessity for coiling the ropes round the drums usually
employed.
In carrying out my Invention in order to effect these objects I employ a single
winding rope, an upper set of grooved head gear pulleys, and a lower set of grooved
winding pulleys, each consisting of two pulleys and an intermediate grooved pulley
between the two sets. The rope is attached at one end to one of the cages, passes
over one of the head gear pulleys, under one of the winding pulleys (to which the
motive power is applied), and back over the intermediate pulley, and then under
the other winding pulley, and thence over the other head gear to the other
cage, to which the end of the rope is attached. By this arrangement not only is
greater durability of the rope ensured, but all tendency to slipping of the rope is
entirely obviated, as in proportion as the weight of the load is increased the
adhesion of the rope is augmented.
The bearings of the intermediate pulley may be carried in a movable frame,
either inclined or otherwise, so as to admit of the pulley being adjusted as required
in order to maintain the rope taut.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Craven in the Great Seal Patent Office on the 23rd February
1882.
JOHN CRAVEN, of Wakefield, in the County of York, Engineer. " IMPROVEMENTS
IN WINDING GEAR FOR MINES."
My Invention, relating to improvements in winding gear for mines, has for its
object to provide gear which will prevent the great wear in the ropes which occurs
when one coil chafes against another, and which will also obviate the necessity for
coiling the rope round the drums usually employed.
And in order that my said Invention may be fully understood I shall now
proceed to describe the same, and for that purpose shall refer to the annexed Sheet
of Drawings, the same letters of reference indicating corresponding parts in all the
Figures.
Figure 1 represents in elevation, and Figure 2 in plan, winding gear constructed
or arranged according to my Invention. A is the shaft of the mine, and B the
engine house. The set of two grooved hand-gear pulleys C is mounted in bearings
on the head gear or frame work D, and the lower set of two grooved winding
pulleys E is keyed on the crank shaft F of the engines K in the engine house.
The pulleys C preferably are set at an inclination inwards towards the winding
pulleys E, as shewn in the plan. The intermediate grooved pulley G is mounted
in bearings H carried by the frame. work D. The single winding rope I is
attached at one end to one of the two cages J, and passes over one of the head
gear pulleys C, thence under one of the winding pulleys E, and then back and
over the intermediate pulley G, and then under the other winding pulley E and to
and over the other head gear pulley to the other cage J, to which the end of the
rope is attached. The winding engine is indicated at K, and its power is applied
to the cranked shaft F of the engines, on which the pulleys E are mounted, so as
to drive the said pulleys in the one or the other direction for raising the one cage
and lowering the other by the one rope I. By this arrangement not only is great
durability of the rope obtained, but all tendency to the slipping of the rope is
entirely obviated, as in proportion as the weight of the load is increased the
adhesion of the rope is augmented. The bearings H of the intermediate pulley G
are in blocks L, which are capable of sliding upon guides M carried by the frame-
work D. To the said blocks L are attached the rods N, the other ends of which
are screwed and pass through lugs P, and are provided with screw nuts Q. By
screwing up or slackening these nuts the bearings H can be moved in one or the
other direction to maintain the rope J taut, or to slacken or tighten the same as
required.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the herein before in part
recited Letters Patent is,-
:
The improved winding gear for mines constructed or arranged and combined
essentially as hereinbefore described, and illustrated in the accompanying
Drawings.
In witness whereof, I, the said John Craven, have to this
eet my hand and cool thi
my Specification