Hoisting Apparatus.
Year: 1886

page_text: Hoisting Apparatus.
I ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention (a communication from
Gottlob Warttinger Engineer and Samuel Gustaf Rosenberg Architect both of
Berlin in the German Empire) 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 improvements in brakes for lifts, cranes and other
hoisting apparatus and the like.
The accompanying drawings represent the brake apparatus as applied to a
hoisting machine, and in the drawings
Figure 1 represents an end elevation.
Figure 2 a longitudinal section.
Figure 2 a cross section showing the position of the parts of the brake when
the brake is applied.
Figure 4 represents on a larger scale details of the parts of the brake.
x
The hoisting apparatus is actuated by the fly wheel S mounted on the shaft A.
On the same shaft A is mounted a clutch coupling consisting of two parts one
part C¹ of which slides on the shaft and on to a feather and is operated by the
striking lever D while the other part E of the coupling forms the side of the
winding drum H.
Round the drum. H is wound the rope or chain when a load is hoisted by
turning the fly wheel S when the jaws of the couplings will engage.
The other side of the drum H is formed by the part F of the ball brake which
part is rigidly connected with the part E of the coupling by screws G extending
through the whole length of the drum H.
The ball brake consists of the above mentioned part F into which fits the
opposite part F1 round the periphery of which is fitted a brake arrangement
consisting of the brake blocks K. K. or of a brake band which brake arrange-
ment is operated by the lever L provided with a weight M or with a suitable

page_text: spring. The part of the brake is provided with three tapering chambers x y z
into each of said chambers are placed balls x1 y1 z¹ respectively. When the drum
is turned in the direction of the arrow Figure 2ª by which turning the rope is
wound round the drum and the load hoisted the balls x¹ y¹ z¹ will be in the position
indicated in Figure 2ª and can move freely in the parts of the chambers x y z
having a slightly larger diameter than the balls.
When the shaft is turned in the direction of the arrow Figure 3ª the balls
x y z will be jammed in the tapering part of the chambers x y s and will
by their friction connect the two parts F and F¹. As F¹ is held by the brake
blocks K K, the part F with the drum H will also be stopped preventing the rope
from being unwound. The rope can only be unwound when the part F¹ is released
from the pressure of the brake blocks K K, so that the part F can turn and the
balls xyz can return into the wider parts of the chambers xyz whereby the
connection between the two parts F and F is released. The periphery f of
the sleeve of part F and the inner sides w of the chambers in part Fi are roughened
so as to produce a stronger friction in contact with the balls x y z¹.
Only by lifting the lever L can a load, be lowered as otherwise the balls x¹ y¹, 21
will stop the movement of the part F and with it the movement of the drum H.
To prevent dirt from entering the chambers x y z a projecting ring o is provided
on part F which fits into a corresponding groove p on part F¹.
The balls are preferably made of elastic material with or without a non-elastic
solid centre.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to
me by my foreign correspondent I declare that what I claim is
1. A brake for lifts, cranes or other hoisting apparatus essentially consisting of
two discs fitted over one another, the outer one of which is held by brake blocks,
and which discs form chambers in which are balls of elastic material for the
purpose of stopping the revolution of both discs by the jamming of the balls or
of permitting both discs to revolve independently of each other substantially as
specified.
2. In a brake for lifts, cranes or other hoisting apparatus the application of
elastic balls for the purpose of bringing two parts into the same or different
directions of revolution substantially as specified.
3. In a brake for lifts, cranes or other hoisting apparatus; two discs such as F
and F¹ fitting into one another for the purpose of forming chambers tapering at
one end substantially as specified.
4. The combination with a brake for lifts cranes or other hoisting apparatus of
a coupling a drum or a pulley and the brake blocks or bands for the purpose
of letting the parts of the brake act automatically when the brake blocks or bands.
are uncoupled or lifted.
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1
1000