An Improved Method of and Means for Preventing the Overwinding of Hoisting Machinery at Collieries and elsewhere.
Year: 1897

page_text: Date of Application, 2nd Mar., 1897-Accepted, 29th May, 1897
An Improved Method of and Means for Preventing the Overwinding
of Hoisting Machinery at Collieries and elsewhere.
I, WILLIAM HARDCASTLE, 179, Grange Road, Birkenhead, Clerk, 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 method of and means for preventing the
overwinding of hoisting machinery at collieries and elsewhere, and the object is to
prevent accidents arising from the above cause.
In carrying my invention into effect, I proceed in or in about the following
manner, and in this specification I make reference to the accompanying sheet of
drawings, in which :-Fig. 1. is a side view of the arrangement, and Fig. 2. a front
view of the nuts hereafter referred to. I provide a screw threaded shaft a revolving
in bearings band rotated by the engine directly, or by any suitable gear. A simple
mode of driving is shewn in the drawing, and consists in providing a bevel wheel c
at the end of a, gearing into another bevel wheel d, which may be on the crank
shaft of the engine of which e is the fly wheel. On the shaft a are two nuts ffl
so placed that when the engine has raised the cage or the like to a given height,
fwill come in contact with the lever or other arrangement (of which an end view
is indicated at 9) controlling the gear by which the engine is started, stopped,
or reversed. Assuming contact off with g to reverse the engine, then will
commence to run back, until f¹ comes in contact with g, and again reverses the
engine and so on. Thus the engine can be started, stopped, or reversed when the
cage has reached a safe point below overwinding position.
In order to keep fand f¹ from turning round on the shaft a, they are prolonged.
as at h, the upper ends running between two guides i placed side by side with the
prolonged ends free to run along between them. Other means of guiding may be
employed as for instance, a horizontal hole may be provided through the end h,
and through these may be passed a rod extending from end to end of the shaft a.
The rod would be of such diameter as to allow f f¹ to pass freely along it. It is
obvious that other than the particular method shewn may be employed for the
rotating of shaft a, and I do not therefore confine myself to that particular mode of
driving, nor to the precise relative proportions or positions of the various parts of
the arrangement, as such modifications as may be required to meet conditions or
circumstances will not interfere with the essential feature of the invention.
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 :-
CLAIMS.
1. The improved method of and means for preventing overwinding of hoisting
machinery at collieries and elsewhere, the said means consisting essentially of a
screw threaded shaft running in bearings and rotated in any suitable manner by the
engine, the said screw threaded shaft having on it two suitably guided nuts which
alternatele come in content with the lavar
other contrivance controlling the

page_text: described in the above specification, and exemplified in the accompanying
drawings.
.
2. The improved method of and means for preventing overwinding of hoisting
machinery at collieries and elsewhere, the said method being provided for by means
substantially as described in the above specification, and exemplified in the
accompanying drawings.
HUGHES & YOUNG,
23, Coleman Street, London, E.C., Agents for Applicant.