Improvements in Hoisting Apparatus.
Year: 1892

page_text: Date of Application, 4th June, 1892-Accepted, 23rd July, 1892
COMPLETE SPECIFICATION.
Improvements in Hoisting Apparatus.
I, THOMAS THOMAS, of the Acme Hoist Works, Cardiff, Hoisting Engineer, in
the County of Glamorgan 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:—
I will describe my invention as applied to a hoisting machine in which the load
is "self-sustained."
Fig. 1. is a side elevation, and
Fig. 2. a plan in part section of a hoisting machine.
Between journals A and B in the frames of the hoisting machine upon a shaft C.
are two pulleys D and E, and a wheel F. The wheel F is fixed to the shaft C, but
the pulleys D and E are free to revolve upon it. On opposite sides of the wheel F,
and concentric with the shaft C, are annular rings, or grooves, which correspond
with annular grooves, or rings, in the pulleys D and E. Guides G G on the frames
keep the pulleys D and E out of contact with the wheel F when the said pulleys
are driven idly in opposite directions by means of open and crossed belts.
On one end of the shaft C outside of one frame of the hoisting machine is a
pinion H, which is kept from revolving on the shaft C by a feather sunk in the
said shaft, but the shaft and its feather can slide laterally in the pinion.
On the other end of the shaft C outside of the other frame of the hoisting
machine between two collars I and J on the said shaft is a chain wheel K. The
shaft C is free to revolve in its journals, and also in the chain wheel K, but the
boss of the chain wheel K is screwed to fit a corresponding screw in a projection of
the journal in the frame of the hoisting machine. The collar I is kept from sliding
one way by a shoulder on the shaft C, and the collar J from sliding in the other
direction by locked nuts L on the screwed end of the said shaft.
The chain wheel K is geared by means of an endless chain to a combined chain
and hand-rope wheel, which is fitted on the screwed end of the drum shaft of the
hoisting machine. The lateral travel of the combined chain and hand-rope wheel
on the drum shaft can be adjusted by means of locked nuts M and N on the said
shaft.
The action of the apparatus is as follows:-
:-
When it is desired to give motion in one direction to the hoisting machine, the
operator pulls a hand-rope, which is fitted to the combined chain and hand-rope
wheel. The rotary motion of the endless chain O causes the chain wheel K to
travel laterally against the collar I, and give a lateral sliding motion to the shaft C.
The wheel F, being fixed to the said shaft, also moves laterally, and engages with
the pulley D, and motion is given through the pinion H to the gearing of the
hoisting machine. When the operator pulls the hand rope in the opposite direction
the wheel F is withdrawn from contact with the pulley D, and the hoisting machine
comes to a standstill, but, if the hand rope is pulled further in the same direction,
the wheel F is forced into contact with the pulley E and motion given through the
pinion H to the gearing of the hoisting machine in the other direction.
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 :-
(1.) The combination of fast and loose clutch pulleys and reversing gear on a
common axis substantially as described:

page_text: (2.) In a "self-sustaining" hoisting machine,, the combination of a combined
chain and hand-rope wheel, endless chain, reversing gear, fast and loose clutch
pulleys, and pinion shaft substantially as described and shown in the drawings.
Dated 3rd day of June 1892:
THOMAS THOMAS.