Improvements in Winch Gear for Hoists.
Year: 1899

page_text: Date of Application, 29th Mar., 1899
Compinto Cannifination Loft 20th Den 1000
1000
PROVISIONAL SPECIFICATION.
Improvements in Winch Gear for Hoists.
We, Sir W. G. ARMSTRONG, WHITWORTH & COMPANY, LIMITED, Manufacturing
Engineers, and LEONARD NEWITT, Engineer, both of Elswick Works, Newcastle-
on-Tyne, do hereby declare the nature of this invention to be as follows:-
This invention relates especially to ammunition hoists such as are described
in the Specification No. 3314 of 1898 but it is also applicable to other hoists
such for example as one in which a worm and worm wheel is employed.
According to this invention the hoist is worked by two bevel wheels without
teeth, either of which can be brought by a lever into contact with another bevel
wheel which is preferably built up of fibrous material and securely attached to
the shaft of a continuous running motor. An automatic tripper-gear is fitted,
which prevents the hoists over-running in either direction.
This consists of a nut working on a screw thread on the shaft on which the
pair of bevel wheels are free to slide. This nut is prevented from rotating
and therefore moves along the shaft as the latter revolves until it comes against
one or other of the bevel wheels and carrying it with it along the shaft takes it
out of contact with fibre wheel so stopping the machine.
Sometimes in lieu of the fibre wheel gearing with other wheels we employ
ordinary belts which run on a drum driven by the motor. The belts transmit
their motion to other pulleys and one belt being crossed enables a reversing
action to be obtained. Thus the motor may be left to run continuously the belts
acting on idle pulleys, but should it be desired to communicate a motion to
the pulley either one or other of the belts is shunted on to the pulley which is
attached to the shaft. The shaft is geared in a suitable manner to the winch or
worm and worm wheel. .
In this case the nut on the shaft of the pulleys is attached to an arm or
bracket which is therefore driven backwards or forwards along the shaft according
to the direction in which the latter is turning. When the stroke is complete
the arm or bracket engages with a system of rods which throws the working
belt on to an idle pulley.

page_text: Improvements in Winch Gear for Hoists.
We, Sir W. G. ARMSTRONG, WHITWORTH & COMPANY, LIMITED, Manufacturing
Engineers, and LEONARD NEWITT, Engineer, both of Elswick Works, Newcastle-
on-Tyne, 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 relates especially to ammunition hoists such as are described
in the Specification No. 3314 of 1898 but it is also applicable to other hoists
such for example as one in which a worm and worm wheel is employed.
According to this invention the hoist is worked by two bevel wheels without
teeth, either of which can be brought by a lever into contact with another bevel
wheel which is preferably built up of fibrous material and driven by the shaft of
a continuous running motor or the pair of wheels may be on the motor shaft
and the single wheel on the hoist. An automatic tripper gear is fitted, which
prevents the hoists over-running in either direction.
This consists of a nut working on a screw thread on the shaft on which the
pair of bevel wheels are free to slide. This nut is prevented from rotating
and therefore moves along the shaft as the latter revolves until it comes against
a spring buffer on one or other of the bevel wheels, and carrying it with it
along the shaft takes it out of contact with fibre wheel so stopping the machine.
Or the nut may be arrested by fixed stops so that the shaft continuing to
rotate is moved longitudinally by screwing in the nut.
Sometimes in lieu of the fibre wheel gearing with other wheels we employ
ordinary belts which run on a drum driven by the motor. The belts transmit
their motion to other pulleys and one belt being crossed enables a reversing
action to be obtained. Thus the motor may be left to run continuously, the
belts acting on idle pulleys, but should it be desired to communicate a motion to
the pulley, either one or other of the belts is shunted on to the pulley which
is attached to the shaft. The shaft is geared in a suitable manner to the winch
or worm and worm wheel.
In this case the nut on the shaft of the pulleys is attached to an arm or
bracket which is therefore driven backwards or forwards along the shaft according
to the direction in which the latter is turning. When the stroke is complete
the arm or bracket engages with a system of rods which throws the working
belt on to an idle pulley.
Figure 1 is a plan, Figure 2 a section (on the line 2-2 Figure 1), and
Figure 3 a local section of an apparatus constructed according to this invention.
a is a continuously running electric or other motor, and bare pinions built
up of fibrous material fixed to the screw threaded sleeve d turning with but
free to be moved along its shaft a¹. c is a bevel wheel fixed to the shaft e
which drives the hoist f. g is a lever by which the sleeve d can be moved
along the shaft a¹. h is a nut on the sleeve d which is prevented from turning
by a wing fixed to it and working in a guide slot in the bed j. of the machine.
kk are adjustable stops on the bed j. The hoist is started by the lever which
brings one of the pinions b into contact with the wheel c thus causing the
sleeve and shaft a¹ to revolve. Since the nut h cannot turn with the screw d
it moves along it and ultimately comes against one of the stops k and is thereby
arrested and the shaft a¹ continuing to rotate screws itself longitudinally in the
nut carrying the pinion 6 out of contact with the wheel c thus stopping the
hoist.

page_text: In order to enable the hoist to be worked by hand a bevel wheel A is fixed to
its shaft which gears with a bevel wheel B working loose on the sleeve d (which
is not screw threaded at this part) and prevented from moving longitudinally
by the lug C fixed to the bed and working in the groove B¹ in it.
The wheel B gears with the wheel 1) free to move longitudinally on the
hand gear shaft E, which is driven by the chain wheel F or otherwise: G is a
treadle working the rocking shaft H carrying a clutch J for throwing the
wheel D into gear. K is a spring acting on the back of the wheel D.
Figures 4 and 5 are a plan and side elevation of an alternative arrangement
in which belts are employed. In these figures the motor and hoist are not
shown but the latter is driven by the toothed wheel fixed to the shaft e and
the former drives a pair of belts one direct and the other crossed working either
on the pulley m fixed to the shaft e or on the pulleys or n¹ respectively loose
upon it.
oo are the belt shifters provided with wings o 03 engaging with
projections pp on the sliding rod pactuated by the handle g. In the position
shown both belts are on the loose pulleys n and and the hoist is out of action.
If the rod is moved from right to left the projection p comes against one
of the wings and turns the belt. shifter about its pivot and puts one of
the belts on to the pulley m, the belt shifter o¹ however is not moved as the
projection p2 misses the wing 3. Similarly if the rod p be moved from left
to right the belt shifter is turned whilst remains stationary. In this
arrangement the screw thread is on the shaft e instead of on a sleeve upon it
and the buffer springs are on the rod p and bear against collars g adjustably
fixed to it. The action of the apparatus is similar to that first described.
The nut in place of the screw might turn with the motor and the screw e
fixed but this generally is not so convenient.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that
what we claim is:-
1. The combination of a screw or nut turning with the hoist, a nut or screw
prevented from turning and means put into action at the end of the travel in
either direction of the nut relatively to the screw for throwing the hoist out
of gear.
2. The combination with a winch or worm and worm wheel of friction gear
substantially as described and illustrated in the drawings.
3. Winch gear for hoists substantially as described and illustrated in the
drawings.
T
101 1