Improvements in Self-sustaining Apparatus for Cage Lifts.
Year: 1896

page_text: Date of Application, 17th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in Self-sustaining Apparatus for Cage Lifts.
DAVID JAMES Collier 40 Leyshon Street Pontypridd Glamorganshire South
Wales do hereby declare the nature of this invention to be as follows:-
An Improvement in Self Sustaining Apparatus for a Pit Cage to hold the Cage
suspended by the Guides in event of the winding rope breaking, and consists of
two shafts at each end of the Cage, working in bearings firmly fixed to the top
of the Cage, and having two excentric cam pieces, securely keyed to each end of
each pair of shafts, which grip the Guides, whether rope, rail, or wood, when
the winding rope breaks. The two shafts at each end of the Cage are connected
together by suitable levers which turn the excentric cam pieces towards the Guides
simultaneously and are firmly pressed against the Guides by the aid of a strong
spiral spring suitably attached to the above mentioned levers. When once the
cams grip the Guides the weight of the Cage has a tendency to still further turn
the excentric part of the cams towards the Guides, and firmly locks the Cage to
the Guides, until the Cage is again suspended by the winding rope.
The whole set of cams are kept in their normal position, clear of the Guides
by two levers attached to the inner shaft of each pair, and made to depress the
spiral spring by the aid of two small chains one end of which is fixed to the lever
that depresses the spring and the other end of the chain is fixed to the swivel
or shackle of the winding rope.
Dated this 15th day of September 1896
COMPLETE SPECIFICATION.
Improvements in Self-sustaining Apparatus for Cage Lifts.
DAVID JAMES 40 Leyshon Street Pontypridd Glamorganshire Miner do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
A is the top of an ordinary Pit Cage which is suspended by 4 bridles B.B.B.B,
to the top band of cage is secured four bearing blocks and glands C.C.C.C which
carry spindles D.D.D.D. square in section with round journals. On the ends
of these spindles are keyed cams form of two different radii E.E.E.E.E.E.E.E. on
the two outer spindles D.D. are secured two plates F F one of which bears on
a plate G secured to the inner spindles; the whole bearing on the steel 4
springs H.H.H.H. To the two plates F F are attached bridle chains J.J. each
[Price 8d.1

page_text: with an adjusting screw K. When the Cage is being lowered or raised with its
load, the bridles KK tighten and compress the plates FF F.F. G.G. which
open the cams E allowing the Cage to travel freely between the guides L.L.
In case of the rope breaking, the load being released, the springs react in
virtue of their form and cause the cams to close upwards and inwards thereby 5
gripping the guides and sustaining the load.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what I
claim is:-
That the apparatus will support Pit Carriages and other lifts and sustain them 1
in case the lifting rope or chain breaks, or becomes detached, and is applicable to
wire ropes, bridge rails, and wooden guides respectively, and can be attached to
any Cage in use.
ARTHUR LL. THOMAS
Agent for Applicant.