Apparatus to Prevent Overwinding in Pit Shafts
Year: 1896

page_text: Date of Application, 28th Dec., 1896
Complete Specification Left, 27th Sept., 1897-Accepted, 18th Dec., 1897
PROVISIONAL SPECIFICATION.
Apparatus to Prevent Overwinding in Pit Shafts
DAVID JAMES 40 Leyshon St Pontypridd Glamorganshire Miner do hereby declare
the nature of this invention to be as follows::-
This arrangement can be fixed above or below the surface. In case of overwinding
the cage passes its destination and comes in contact with a cam, which is secured to
a rocking shaft fixed to the pit framing. the motion of which is conveyed by
a Connecting Rod to a vertical Rocking Lever, to which is connected a second
lever with stops at end. which actuates the reversing lever of the Winding Engine
and in case of overwinding throws it on its centre.
On the extreme end of the rocking shaft referred to above is secured a bell
crank connected to the vertical rocking lever. which motion is conveyed back to the
bell crank. thence to the lever of the Steam inlet valve and in case of overwinding.
cuts off steam and throws the reversing lever on its centre.
With this arrangement overwinding in either bond of the Pit can be conveyed to
the Steam & Reversing Valves.
Apparatus to Prevent Overwinding in Pit Shafts.
DAVID JAMES 12 Philip St. Graig (late 40 Leyshon St) Pontypridd. S. Wales
Miner 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 :-
.A.A. are two parallel shafts crossing the mouth of a pit shaft. to which are secured
two levers .B.B. over the centre of cages .R, R, which act alternately.
When the cage R, passes up beyond the surface it comes in contact with lever .B₁.
which actuates the shaft A and rocking lever .C. giving the same a backward motion
which is transmitted by the connecting rod .D. to lever .E. secured on shaft .F.
To lever E. is secured a connecting rod .G. with a stop on end. which engages
with the lever .H. of steam valve and cuts off. steam. Secured to the shaft.F. is
a lever P. to which is attached a connecting rod .M. with two stops this rod acts
simultaneously with lever .G. and throws the reversing lever .N. forward and reverses
the action of the winding engine. When cage R. engages with lever B₂ it transmits
a forward motion to connecting rod .D. and connecting rod L. which is secured to
lever .S. on shaft F. this actuates the rocking lever .K. and transmits a backward
motion to connecting rod .J. and cuts off steam with lever .H.. The forward motion
Prine d

page_text: of lever E sends forward connecting rod .M. secured to lever .P. on shaft .F. and
throws the reversing lever .N. forward and reverses the engine. Shaft A is provided
with a hand lever .T. so that the banksman may carry out all the aforesaid if need.
In case of the rope breaking after passing levers B, B, and to prevent cage falling
down the pit, the guides .V.V.V. are provided with catches which are pivoted
loose W.W. and are raised by the cage. but fall due to their own weight and form
a support for the cage.
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 in a case of overwinding the apparatus will cut off the supply. of
steam and at the same time. reverse the action of the winding engine thereby
preventing the cage being taken up to the pit sheaves should the rope break after
passing the levers. the cage would fall on the catches, and prevent it falling down the
pit, the apparatus can also be used by the banksman by aid of the hand lever in case
of an illness to the engine driver.
ARTHUR. LL. THOMAS
Agent for Applicant.