Improvements in Apparatus for Lifting Weights in Warehouses and other places.
Year: 1892

page_text: Date of Application, 26th Sept., 1892
Complete Specification Left. 26th June. 1893-Accepted, 12th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Lifting Weights in Warehouses
and other places.
I, THOMAS ABBOTT of the Firm of Abbott & Co. of Newark on Trent in
the County of Nottingham, Engineers, do hereby declare the nature of this
invention to be as follows:-
The jib is fixed to a vertical tube working in bearings upon two brackets fixed to
the wall of the warehouse or otherwise supported. Inside the tube is a vertical
axis to whose upper end is fixed a pinion gearing with a ring of teeth upon a drum
working in bearings on the upper bracket. The lifting chain passes over a pulley
on the end of the jib and is wound upon this drum-the point where the chain meets
the drum being as nearly as may be in the centre line of the vertical axis. At the
lower end of the vertical axis is fixed a bevel pinion gearing with a bevel pinion
fixed to one end of a shaft to whose other end is fixed a crank and handle. The
crank axis is provided with a brake and retaining ratchet.
Dated this 24th day of September 1892.
THOS. ABBOTT.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Lifting Weights in Warehouses
and other places.
I, THOMAS ABBOTT, of the Firm of Abbott & Co., of Newark on Trent, in
the County of Nottingham, Engineers, 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 :-
:
The jib is fixed to a vertical tube working in bearings upon two brackets fixed
to the wall of the warehouse or otherwise supported. Inside the tube is a vertical
axis to whose upper end is fixed a pinion gearing with a ring of teeth upon a drum
working in bearings on the upper bracket. The lifting chain passes over a pulley
on the end of the jib and is wound upon this drum-the point where the chain
meets the drum being as nearly as may be in the centre line of the vertical axis.
At the lower end of the vertical axis is fixed a bevel pinion gearing with a bevel
pinion fixed to one end of a shaft to whose other end is fixed a crank and handle.
The apparatus is provided with a brake and retaining ratchet.
Figure 1 is a side elevation of the apparatus.
Figure 2 is a side elevation, Figure 3 a front elevation, Figure 4 a rear elevation
and Figure 5 a sectional plan of the upper bracket c with the drum h and parts
connected with it. Figure 6 is a back elevation, Figure 7 a side elevation and
Figure 8 a front elevation of the lower bracket c and lifting gear. Figures 2 to 8
are all to a larger scale than Figure 1.
a is the jib fixed to the tube b working in bearings in the two brackets cc on the
wall d. Inside the tube is the vertical axis e to whose upper end is fixed the
pinion gearing with an internal ring of teeth 9 upon the wheel h¹ fixed to
the bottom of the drum h. k is a brake strap one end of which is fixed to the
bracket c and the other end to the lower extremity of the upright arm of the
T shaped lever k pivotted at k² and operated by the pair of handles or pulls k³
fixed to the ends of its horizontal arms. I is a lever pivotted at 1' to the jib a and

page_text: having at its upper end the weight 12. The lifting chain a¹ passes over the pulley a*
at the end of the jib through the eye 13 on the lever to the drum h. The action
of the lever is to lay the chain evenly on the drum, its two extreme positions are
shown in dotted lines in Figure I and its central position in full lines. When it is
to the left of its central position the weight tends to press the rope downwards
and when to the right it tends to lift it. At the lower end of the axis e is fixed the
bevel pinion m and also the worm wheel n. The pinion m gears with a pinion o on
the shaft which can be turned by the crank handle q.
P
This gear is used for
quick lifting. The shaft p also has fixed to it the ratchet wheel pl with which the
retaining pawl p³ engages. When a slow lifting motion is required the handle q is
shifted to the shaft s and the worm r upon the shaft s is brought into gear with the
worm wheel n.
When lifting the turning motion tends to keep the worm in contact with the end
of the tubular bearing u and so prevents it from coming out of gear and a similar
result is obtained in lowering by the weight of the suspended load. The worm is
thrown out of gear very readily when the load is off the crane by giving a turn or
two of the handle in the direction of lowering which causes the worm to screw
itself clear of the worm wheel when a pawl t drops into a circumferential groove in
the shafts and holds it out of gear.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declare that what
I claim is
1. The combination of a vertical tube free to turn, a jib fixed to the tube, an
axis inside the tube and a winding drum driven by the axis.
2. Apparatus for lifting weights in warehouses and other places substantially as
described and shown in the drawings.
Dated this 26th day of June 1893.
THOS. ABBOTT.