Year: 1887

page_text: Date of Application, 2nd Feb., 1887
Complete Left, 29th Sept., 1887
Complete Accepted, 18th Nov., 1887
I, EDWARD THOMAS CLEATHERO of 34 Malpas Road, Brockley, in the County of
Kent, Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to self-sustaining mechanism applicable to the lifts and other
mechanisms and while modifications may of course be made to adapt it to different
purposes it may be described in connection with a cage lift as follows.
The shaft which carries the grooved rope pulley, chain wheel, spur pinion wheel or
equivalent has a threaded portion preferably double threaded and coarse pitched upon
which the rope pulley screws. Each side of this pulley is faced up and in close
proximity to the side face of a ratchet wheel secured upon the same shaft in any
convenient manner. A pawl is hung so as to engage with each ratchet and the two
are preferably united; if it was required to sustain the load in one direction only,
one ratchet and pawl would suffice.
The shaft above described is carried in bearings and has upon it the driving or
winding wheel and the action is as follows:-
The power is applied to the winding wheel in the usual manner and turning the
shaft screws the rope pulley up against the face of one of the ratchet wheels which
turns round and slips past its pawl but when the power ceases the rope pulley is
pulled round in either direction according to which end of the rope carries the heavier
load. But the shaft is now stationary so that the turning of the rope pulley screws
it up against one or other of the ratchets which must then turn with it if the pulley is
to turn any further. The direction of motion however imparted to the ratchet is
such as to bring its teeth into contact with its pawl and both ratchet wheel and
rope pulley are thereby stopped and the load held up until the rope pulley is
released from contact with the ratchet wheel by the turning of the driving wheel and
shaft.
It will be understood that the abovo described " rope pulley" need not necessarily
be a pulley at all and where gearing was employed it would be a spur wheel or
pinion, chain wheel or the like.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Lifts, Hoists, Cranes, or the like.
I, EDWARD THOMAS CLEATHERO of 34 Malpas Road, Brockley in the County of
Kent, Engineer 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 to self sustaining mechanism applicable to the lifts and other
mechanisms and while modifications may of course be made to adapt it to different.
purposes it may be described in connection with a cage lift as follows:
The shaft which carries the grooved rope pulley, chain wheel, spur pinion wheel or
equivalent has a threaded portion preferably double threaded and coarse pitched upon
which the rope pulley screws. Each side of this pulley is formed with a circular
bevilled groove and is in close proximity to the side face of a silent ratchet disc upon
the same shaft in any convenient manner and having a circular projection corre-
sponding to the said groove.
A roller in a cam shaped recess is arranged to engage with each ratchet disc when
turning in opposite direction; if it was required to sustain the load in one direction
only, one ratchet disc and roller would suffice.
The shaft above described is carried in bearings and has upon it the driving or
winding wheel and the action is as follows:
The power is applied to the winding wheel in the usual manner and turning the
shaft screws the rope pulley so that its groove engages with the circular projection of
one of the ratchet discs which turns round and slips past its roller, but when the
power ceases the rope pulley is pulled round in either direction according to which
end of the rope carries the heavier load. But the shaft is now stationary so that the
turning of the rope pulley screws it up against one or other of the ratchet discs which
must then turn with it if the pulley is to turn any further. The direction of motion
however imparted to the ratchet disc is such as to bring its periphery into contact
with its roller and both ratchet wheel and rope pulley are thereby stopped and the
load held up until the rope pulley is released from contact with the ratchet disc by the
turning of the driving wheel and shaft.
"
It will be understood that the above described "
rope pulley need not necessarily
be a pulley at all, and where gearing was employed, it would be a spur wheel or
pinion, chain wheel or the like.
Fig. 1 of the accompanying drawings shews a front elevation of a hand lift
constructed according to my above described invention.
Fig. 2 shews a plan Figs. 3 and 4 shew respectively an enlarged sectional plan and
vertical section of the winding mechanism.

page_text: The shaft A on which the hand rope pulley B is fixed has a threaded portion a on
which fits with a female thread the grooved rope pulley of the lift, and on each side
of this are two ratchet discs D D' having circular bevilled projections d which fit into
corresponding grooves on the sides of the pulley C. These ratchet discs are loose
The ratchet discs
upon the shaft A, and butt against screwed collars G on the same.
work within circular openings in two side cheeks E E¹ fixed to the framing, in which
cheeks are recesses e containing rollers or friction pawls F F which bear respectively
upon opposite sides of the two discs, so that, the recesses being cam shaped or tapered
in a downward direction it will be seen that the rotation of the one disc D will be
prevented in the one direction by the friction pawl F, while the rotation of the other
disc D' will be prevented in the other direction by the pawl F'. Thus on rotating the
shaft A by the pulley B in the direction of the arrow, for raising the loaded lift
cage H the grooved pulley C will first be shifted laterally in the direction of the arrow
Fig. 3 by the action of screw a until its groove is jammed tight upon the annular
projection of the disc d of the disc D; and as the abuttment G of the latter will
prevent further lateral motion the pulley C will be carried round by the shaft
together with ratchet disc D, which will turn in an upward direction on the side
where its friction roller F is situated, so that the latter will not impede its rotation.
If now the hand rope of the pulley B be let go of, the weight of the lift cage with
its load will tend to pull the pulley round in the contrary direction to that in which
it was previously turned. In doing so the pulley will also tend to drag round the
disc D in the same direction, but as the friction pawl F will then come into action,
the motion of the disc and consequently of the pulley C will be stopped. In order to
enable the load to be lowered under these circumstances, the shaft A is turned slightly
in the direction contrary to that of the arrow by means of the wheel B and hand
rope, whereby the pulley C will be screwed sufficiently away from disc D to allow it
to revolve freely in that direction, the descent of the load being checked when
required by applying a drag on the opposite side of the hand rope, whereby, the
rotation of the shaft A being thus checked, the pulley C will again be screwed with
more or less force against the disc D.
Thus by applying a drag on the one or the other side of the hand rope while the
load is descending, the speed of the latter may either be more or less checked, or it
may be altogether stopped, and then started again, or by applying a forcible pull in
the direction of the arrow, it may be caused to rise again, so that the action is under
complete control.
The same action as above described, but in the contrary direction will take place
when the lift cage is to be raised or lowered empty, the balance weight I being made
somewhat heavier than the cage so that this has a tendency to rise the wheel C being
in that case brought against the disc D' by the action of the screw thread for
checking the ascent of the cage.
The action will also be the same when a second lift cage is employed, in place of a
balance weight.
Fig. 5 shews a vertical section of an arrangement of the above described invention
to more powerful lifts worked either by hand or by power, the lift pulley C being in
this case upon a second shaft J carrying a spur wheel K gearing with a pinion L on
the threaded part a of the first shaft A.
This pinion has circular grooves for gearing with the circular projections d d¹ of
the ratchet discs D, D¹, provided with friction pawls in the cheeks EE'; and operating
in precisely the same manner as above described.
It is obvious that the circular grooves may be formed on the pulley or toothed wheel
and the projection on the ratchet dises.
Although in Fig. 5 I have shewn a rope or chain wheel B as means of driving
obviously bands acting on live and dead pullies or other driving gear might be
employed according to the nature of the motor applied. Also instead of a chain
wheel C for lifting the load a barrel might be driven in this manner. In cases where
there are intermediate shafts between the primary driving shaft and the chain wheel

page_text: or barrel that is driven, the stop or sustaining gear described may be applied to such
intermediate shafts.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
As stop or sustaining gear in raising and lowering apparatus the combination of a
driving pulley or pinion having a threaded boss mounted on a threaded driving shaft,
and a ratchet disc with friction pawl or roller having bevilled circular projections or
grooves capable of engaging with corresponding grooves or projections on the driving
pulley or pinion these parts being arranged in either or on both sides of the driver and
operating substantially as herein described.
Dated this 90th of Cont
1007
ABEL & IMRAY,
Agents for the Applicant.