IMPROVEMENTS IN MACHINERY FOR RAISING AND LOWERING WEIGHTS
Year: 1884

page_text: I, WILLIAM GEORGE CLISSOLD Brewer Nailsworth Gloucestershire do hereby
declare the nature of my invention for IMPROVEMENTS IN MACHINERY FOR
RAISING AND LOWERING WEIGHTS to be as follows:-
In ordinary Hoists it has hitherto been usual to regulate the working of the same
by two cords or their equivalent, one for putting the Hoist into gear, and the other
for throwing it out of gear or starting it in the opposite direction and my
Improvement consists in substituting one cord for the two previously in use, which
besides making a simpler arrangement in every way saves any effort of meniory on
the part of the person working the Hoist as to which cord he has to pull, it also
has the further advantage of throwing the working parts into action more smoothly
whereby wear is avoided, My Invention is particularly adapted to double lift
friction Hoists, which are started in either direction, by means of pullies running in
opposite directions being brought into alternate frictional contact, with the pulley
directly connected with the lifting chain or cord. I throw the driving wheels into
contact through the Medium of a Lever weighted at the top and centred at the
bottom, and which consequently when in a vertical position exerts no force either
way. If however the weight passes the centre in either direction, it tends to throw
one or other of the driving wheels into gear. It is to the Upper end of this Lever
that the starting cord is attached and when the Hoist is out of gear the weighted
lever is nearly in a vertical position the starting cord being then fastened up to
keep the Hoist out of gear.
To start the Hoist the cord is unfastened and the Lever is lowered by hand,
which brings one or other of the friction wheels into gear, if it is the wrong one
the weighted lever is immediately pulled over by the cord its momentum being
sufficient to carry it past the vertical line, after passing which, it is lowered by
hand on the right side, and starts the Hoist in the right direction. In order to
stop the load automatically after it is lifted the desired height, the chain or cord
passes through eyes, which are connected with the starting cord and the sack or its
equivalent coming into contact with the eyes lifts them, and takes as much pressure.
off the friction pullies as will keep the weight suspended, without being lifted
higher.
Dated this 22nd day of Tona 1001

page_text: I WILLIAM GEORGE CLISSOLD, Brewer of Nailsworth, Gloucestershire do hereby
declare the nature of my invention for IMPROVEMENTS IN MACHINERY FOR
RAISING & LOWERING WEIGHTS and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
In ordinary Hoists it has hitherto been usual to regulate the working of the same
by two cords, or their equivalent one for putting the Hoist into gear, and the other
for throwing it out of gear, or starting it in the opposite direction, and my
Improvement consists in part in substituting one cord for the two previously in use,
which besides making a simpler arrangement in every way, saves any effort of
memory on the part of the person working the Hoist as to which cord he has to
pull, it also has the further advantage of throwing the working parts into action
more smoothly whereby wear is avoided, and in order that my said Invention, and
the manner of performing the same may be properly understood, I have hereunto
appended a sheet of explanatory drawings.
Figs 1 & 2 show a plan and Elevation of a double lift hoist 1 is the bell pulley
driving the Hoist which with the friction cone pullies 2 & 3 is always running.
In the drawing, the friction cone 3 is shown in contact with the wheel 4, which
causes it to revolve, and through the medium of the pinion 5 and the intermediate
wheel 6 gives a slow motion to the internal gear wheel 7 which forms part of the
chain wheel or drum, to which are attached the chains or their equivalents 8 & 9
for lifting or lowering the weights.
The wheel 3 is kept in contact with the friction wheel 4, through the medium of
the weighted lever 10 which is centred at 11 and through the pin 12 plate 13 and
sleeve 14 exerts sufficient end thrust on the shaft 15 to make the friction
wheels 3 & 4 drive the requisite power.
If we now suppose the chain 9 to be lifting it will continue to do so till the
ring 16 comes into contact with the bar 17 through which the chain 9 passes. It
will then lift the end of the bar, and through the cord 18 or its equivalent (which
is attached to 19) lift the lever 10 into a more vertical position and thus take
a portion of the weight off and reduce the driving power, so that the sack or
weight being lifted remains suspended till the attendant comes and pulls the cord 19
quickly, when the weighted lever 10 will, by virtue of its momentum, be thrown
past the vertical line, and can quietly be lowered by hand, into the position shown
by the dotted lines, when the chain 9 will be lowered and 8 will lift The block or
eye 20 through which the cord 19 runs is placed a little on one side the vertical
line so that a steady pull at the cord will never pull the lever vertical, but only
sufficiently so to place the wheels 2 & 3 clear of all contact with 4. The object of
this is to ensure that the lever shall not stop on its dead centre at any time. To
stop the Hoist working either way it is only necessary to draw the cord 19 tight
and fasten it up in any way.
Fig 4 shows a pulley 4 and friction rollers 2 & 3. as substituted for the bevil
friction wheels shown in Figs 1 & 2. These rollers are driven in opposite directions
by the wheels 21 & 22 the rollers being drawn into contact by the eccentric 23.
Fig 3 shows an arrangement of bevil gearing and belt pullies as an illustration
of the lever 10 producing a reversing motion with a strap, instead of frictional
gearing.

page_text: Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed I declare what
I claim is,
1st The use (in Hoisting Machinery in which a Reversing Motion is required) of
a lever centred at the bottom and to the upper portion of which is attached, a cord
or its equivalent which is the medium for throwing the lever past a vertical line in
either direction, and thus producing a reversing motion in the machine.
2nd Placing the eye or block, 20, through which the cord 19 passes to the lever,
on one side the vertical line.
3rd Connecting the bar 17 or its equivalent with the cord 19 so that it
automatically stops the machine.