Improvements relating to Sack Hoists.
Year: 1895

page_text: Date of Application, 23rd Mar.,
του
Complete Specification Left, 23rd Dec., 1895-Accepted, 25th Jan. 1896
Application, GUTU May
Complete Specification Left, 23rd Dec., 1895-Accepted, 25th Jan. 1896
PROVISIONAL SPECIFICATION.
Improvements relating to Sack Hoists.
1, GEORGE JOHN, of 107, Harriett Street, Cathays, Cardiff, Wheelwright, do
hereby declare the nature of this invention to be as follows:-
This invention, which relates to sack hoists in which belting is employed for
transmitting motion from the driving shaft to the winding drum shaft, consists in
improvements as follows.
According to this invention, the driving shaft pulley is situated overhead, as also
is the winding drum shaft, drum and pulley. The drum shaft is carried towards
each end in bearings free to move in slotted brackets towards and also away from
the driving pulley. The slot in the brackets is inclined upwards from the plane of
the axis of the driving pulley shaft. A belt extends from the driving pulley
to the drum pulley. When the drum shaft is at its lowest limit of travel in the
slotted brackets the belt is loose and the hoist is out of gear. By pulling a rope
attached to a system of levers connected to the drum shaft, the latter is moved
backwards in the slots of the brackets, and, consequently, away from the driving
pulley shaft. Thus the belt is tightened on the two pulleys, and the drum
commences to hoist and continues winding while the strain on the rope lasts.
When the strain on the rope is relaxed, the drum shaft returns towards the
driving shaft and the drum unwinds.
The driving shaft and pulley and the drum shaft, drum and pulley are, as
aforesaid, overhead, that is to say, just under the ceiling or floor, as also is the
belting, so that they offer no obstruction, except for the rope aforesaid, to free
movement of persons on the floors of a warehouse, mill, or granary, or other
structure, and do not, in that respect, constitute a source of danger.
Dated this 22nd day of March 1895.
NICHOLAS WATTS,
Bristol, Chartered Patent Agent.
I, GEORGE JOHN, of 107, Harriet Street, Cathays, Cardiff, Wheelwright,
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:-
This invention which relates to sack hoists, in which belting is employed for
transmitting motion from the driving shaft to the winding drum shaft, consists in
improvements as follows.
According to this invention, the driving shaft pulley is situated overhead, as also
is the winding drum shaft, drum and pulley. The drum shaft is carried towards
each end in bearings free to move in slotted brackets towards and also away from
the driving pulley. The slot in the brackets is inclined upwards from the plane of
the horizontal axis of the driving pulley shaft.
It may, however, incline downwards. A belt extends from the driving pulley
to the drum pulley. When the drum shaft is at its lowest limit of travel in the
slotted brackets the belt is loose and the hoist is out of gear. By pulling a rope

page_text: attached to a system of levers connected to both ends of the drum shaft, the latter
is moved backwards in the slots of the brackets, and, consequently, away from
the driving pulley shaft. Thus the belt is tightened on the two pulleys, and
the drum commences to hoist and continues winding while the strain on the
rope lasts.
When the strain on the rope is relaxed, the drum shaft returns
towards the driving shaft and the drum unwinds.
The accompanying drawing represents, in side elevation, the improvements
relating to sack hoists in which my invention consists.
The driving pulley a keyed or otherwise fixed upon the driving shaft bis
carried in bearings c fixed to the underside of the beam d constituting part of a
floor.
The shafte of the winding drum pulley is at each end supported in a
bearing block free to slide between guides h, h of which the uppermost his
bolted to the underside of the beam d. The lower guide his bolted to the
upper guide h, as shown. Similar guides are provided and fitted at the further
side of the drum pulley f. The path for the sliding blocks g, of which, as
'aforesaid, there is one for each end of the shaft e, is inclined upwards from the
driving pulley a.
The blocks are adjustably connected by connecting rods, such as i, to
pivoted as at k in a bracket fixed to the beam d.
lever j
A rope connected to the bell-crank lever j extends down sufficiently near the
floor next below, as to enable an operator to grasp it.
By moving the blocks g, through the rope l, bell-crank lever j, and rods i,
sufficiently far away from the driving pulley a, the belt m extending over the
winding drum pulley f is tightened and the drum commences to wind and
loist the sack or other load attached to the hoisting chain. Winding continues
"while the belt remains thus sufficiently tightened, but when the strain on the rope
is relaxed, the blocks are returned towards the pulley a, the belt slackens and
the drum unwinds and lowers the load.
The driving shaft and pulley and the drum shaft, drum and pulley, are, as
aforesaid, overhead, that is to say, just under the ceiling or floor, as also is the
belting, so that they offer no obstruction, except for the rope aforesaid, to free
movement of persons on the floors of a warehouse, mill, or granary, or other
structure, and do not, in that respect, constitute a source of danger.
Instead of being inclined upwards as it recedes from the driving pulley a, as
shown in the drawing, the path for the blocks g may incline the reverse way, that
is to say, downwards as it recedes from the pulley a. In either case, the belt is
tightened as the blocks are made to recede.
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 :-
In sack and like hoists, a winding or hoisting drum pulley carried on bearings,
free to be slid in inclined guides fixed to the underside of Hoors in mills,
granaries, and other warehouses, so that, by means of a rope or the like,
depending from a lever or levers connected to the said bearings, the drum is
capable of being moved at will towards and away from the driving shaft pulley
(rotating in fixed bearings secured to the underside of the flooring) and the belt
extending from the driving shaft pulley to the winding drum shaft pulley is
tightened for hoisting sacks or other loads, and relaxed for lowering the same,
substantially as hereinbefore described with reference to the accompanying
drawing.
Dated this 20th day of December 1895.
NICHOLAS WATTS,
Bristol, Chartered Patent Agent..