Improvements in or relating to the Gear of Lifts.
Year: 1899

page_text: Improvements in or relating to the Gear of Lifts.
I, ROBERT FALKLAND CAREY, of 19, Ash Grove, Cricklewood, County of Middle-
sex, Engineer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide an automatic controller or brake for
lifts. The action is such that directly power is applied to the lift, the lift will
move in either direction, but directly the power is withdrawn, the load is unable
to run down being arrested by the automatic actioned appliances.
The principle relied on is the well known fact that an excentric can be made
of such proportions that it can not be driven by means of pressure applied to the
excentric strap. The brake is applied to a V rope wheel round which the lifting
rope passes having the cage suspended one side and the counter balance weight
heavier than the cage from the other side. The whole of the brake appliances
are contained inside the wheel.
The lift is such as is ordinarily used for dinner lifts, namely, a large wheel
keyed to a shaft which has also a smaller wheel keyed on to it. The large wheel
is the hauling wheel from whence the power is obtained, and the smaller wheel
is the V rope wheel to which it is desired to attach the brake.
According to this invention, the V rope wheel instead of being keyed tightly
on to the shaft has a certain amount of movement allowed by having a wide key-
way and instead of a tight key, a feather fastened to the shaft is used. The inside
of this rope wheel is bored out slightly excentrically to the shaft and inside
this fit loosely an excentric (which has the same amount of play round the shaft
from the feather as the V rope wheel) and an excentric strap provided with a pin.
This pin works in a slot (preferably connected with the bearing). The action is
as follows:-supposing a load to be in the cage greater than the counter balance
weight, the cage will tend to fall and turn the wheel towards the right hand. The
wheel will turn a small distance, when it will bind on the excentric strap which
can not take a rotary motion owing to the pin being held in the slot; and can
not take a lateral or vertical motion as the excentric can not be driven through
its strap.
The inner excentric therefore remains stationary and the V wheel (which is
bored out excentrically) moving a short distance the two eccentrics become out
of register with each other and the whole arrangement binds, thus sustaining
the load.
When however power is applied to the hauling wheel tending to turn the shaft
in either direction, the feather catches first one and then the other excentric
bringing them in to register with one another and freeing the arrangement. The
wheel and the inner excentric are carried round together, lifting or lowering the
load. The excentric strap takes the ordinary motion of an excentric strap, the
pin meanwhile working backwards and forwards in the slot.
Instead of the wheel, a separate casting could be used bored out excentrically
and running partially loose on the shaft as described in connection with the wheel,

page_text: To this, the wheel could be fixed. This would be more convenient in some cases,
especially when the lift is worked by means of gearing, in which case the pinion
would probably be fixed to such a casting.
It is obvious that the power used need not be confined to manual power but
might be gas, steam, electric, etc.
Another arrangement for geared lifts may be made embodying the same prin-
ciple.
In this arrangement, the excentric is rigidly keyed to the power shaft and is
fitted with a strap formed out of a toothed wheel. This strap is fitted with a pin
working in a slot as before. The outside of the excentric strap gears into an
internally toothed wheel of slightly larger diameter running quite freely on the
shaft.
The outside of this wheel may be made the V rope wheel.
The action of this modification is as follows: when the excentric is driven it
carries the toothed strap round the inside of the internal wheel into which it gears.
This strap can not turn, being held by the pin, the internal wheel therefore has
to turn to make up such a distance as is necessitated by the difference of the
diameters thus raising or lowering the load.
When the power is withdrawn, the internally toothed wheel can not drive the
strap as it is unable to turn it, and is also unable to drive the excentric through
the strap. This arrangement would probably be more used for steam or electric
lifts.
In the above description, mention is made only of V rope wheels but it is
obvious that it is equally applicable to lifts driven by means of drums, pitch-
chain wheels, or in other similar manner.
H. GARDNER.
Patent Agent, 166, Fleet Street, London.
Agent for the said Robert Falkland Carey.
I, ROBERT FALKLAND CAREY, of 19, Ash Grove, Cricklewood, County of Middle-
sex, 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:-
The object of this invention is to provide an automatic controller or brake for
lifts. The action is such that directly power is applied to the lift the lift will
move in either direction, but directly the power is withdrawn the load is unable
to run down being arrested by the automatic actioned appliances.
The invention above set forth will be clearly understood by reference to the
annexed drawings.
Figure 1 part sectional elevation of the apparatus.
Figure 2 a face view of the eccentrics within the wheel.
Figures 3 and 4 side and face elevations of the slotted support for the pin of the
eccentric strap.
The principle relied upon is the well known fact that an eccentric can be made
of such proportions that it can not be driven by means of pressure applied to the
eccentric strap.
The brake is applied in the arrangement shown to a Vrope wheel around
which the lifting rope passes having the cage suspended on one side and the

page_text: counter balance weight heavier than the cage from the other side. The whole of
the brake appliances are contained inside the wheel.
The lift is such as is ordinarily used for dinner lifts, namely a large wheel
keyed to a shaft which has also a smaller wheel keyed on to it. The large wheel
is the hauling wheel from whence the power is obtained and the smaller wheel
is the rope wheel to which it is desired to attach the brake.
According to this invention the V rope wheel A instead of being keyed tightly
on to the shaft has a certain amount of movement allowed by having a wide key-
way B and instead of a tight key, a feather C fastened to the shaft D is used.
The inside of this V rope wheel is bored out slightly eccentrically to the shaft D
and inside this fits loosely an excentric E. (which has the same amount of play
round the shaft D from the feather C as the V rope wheel A) and an eccentric
strap F provided with a pin G. This pin works in a slot H of a lug I (preferably
connected with the bearing J).
The action is as follows supposing a load to be in the cage greater than the
counterbalance weight the cage will tend to fall and turn the wheel A; the wheel
will turn a small distance when it will bind on the eccentric strap F which can not
take a rotary motion owing to the pin G being held in the slot H and cannot take
a lateral or vertical motion, as the eccentric E can not be driven through its
strap F. The inner eccentric E therefore remains stationary and the V wheel A
(which is bored out eccentrically) moving a short distance the two eccentrics E. F.
become out of register with each other and the whole arrangement binds thus
sustaining the load.
When however power is applied to the hauling wheel tending to turn the
shaft in either direction the feather C catches first one and then the other
eccentric bringing them into register with one another and freeing the arrange-
ment. The wheel A and the inner eccentric E are carried round together lifting
or lowering the load. The eccentric strap F takes the ordinary motion of an
eccentric strap the pin G meanwhile working within the slot.
Instead of the wheel a separate casting could be used bored out eccentrically
and running partially loose on the shaft as described in connection with the
wheel. To this the wheel could be fixed and would be more convenient in some
cases especially when the lift is worked by means of gearing in which case the
pinion would probably be fixed to such a casing.
It is obvious that the power used need not be confined to manual power but
might be gas, steam, electric etc.
In the above description mention is made only of V rope wheels, but it is
obvious that it is, equally applicable to lifts driven by means of drums, pitch
chain-wheels or other suitable appliances.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is :-
:-
In connection with lifts apparatus an eccentric E with wide key way B in
combination with long feather C on shaft D and encircled by eccentric strap F.
with pin G free to move in forked or slotted lug I, said feather C being brought
into contact with eccentric E by movement of wheel A and the eccentric by
eccentric E the whole acting as a brake to sustain a load the instant the hauling
rope is set free as described, the arrangement being preferably as shown on the
accompanying drawings.
H. GARDNER,
Patent Agent, 166, Fleet Street, London.
Agent for the said R. F. Carey.