Improvements in Pulley Blocks.
Year: 1899

page_text: Date of Application, 31st Jan., 1899-Accepted, 11th Mar., 1899
COMPLETE SPECIFICATION.
Improvements in Pulley Blocks.
1, HEINRICH MORK, Locksmith, of Duisburg, near Cologne, in the German
Empire, 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:-
In ordinary pulley blocks the wheel or pinion which serves to set the weighted
or load-raising sheave in motion and is connected with the axle or pivot of the
hand-chain rotter, is fixed so that the hook and accessories can only be moved up
and down through the medium of the hand chain, but not direct. Hence, while
the hooks run idle and especially where it has been raised to a great height, much
time is wasted in moving it, and the mechanism of the pulley block is subjected
to unnecessary wear.
In the improved pulley block represented by the accompanying drawings, the
pinions is supported in a special frame which is hinged to the frame or block d
of the pulley block by means of a pivot a. Owing to the weight of the frame g
and that of the hand chain pulley connected with such frame, the pinion s auto-
matically drops into gear with the wheel r, unless the frame g be lifted. In
order to lift it, a lover h is provided, which may be connected with a chain, or
over which, as in the form of apparatus here shown by way of example, the hand
chain is passed; so that by pulling this chain the said lever may be lowered, and
thereby caused to throw the pinion out of gear. Thus the empty hook may be
lowered very quickly, and need not for this purpose engage with or join any
other part, even though the pinion on the spindle s is so arranged, that it transmits
motion to the wheel at a greatly reduced speed. The downward motion of the
load sheave i may be controlled by means of a brake shoe or block f. It is con-
nected with the frame g and exercises external pressure upon the chain wheel r,
when the lever his pulled right down. The pinion can only be thrown out of
gear, while the sheave i is not weighted with any load, as otherwise the frame g
is drawn down by the weight suspended from such sheave; for to the said
frame g there is attached a suspension device or the like t, to which one end of the
load-supporting chain is secured; and this chain exercises a pull upon the
said frame, which cannot in consequence be lifted. Or the frame y might be
extended by being coupled with a lever-arm serving for the suspension of the load
chain; whereby the lifting of the pinion would be rendered still more difficult.
To the pulley block there is also fitted a brake device of special construction,
which reliably checks any tendency of the load to recede. On the nave of the
hand chain roller k there are provided inclined projections or tappets, while on
the axle or pivot a sleeve i is loosely mounted, between which and a rail g
forming part of the frame g, there may be interposed a leather washer or the like e.
The sleeve i is provided with inclined surfaces and projections or stops. When
the load is drawn up, see Figs. 2 and 3, the tappets meet the stops , next to
which are situated the depressed portions of the said inclined surfaces. In this
position the sleeve i, and the hand chain roller k, have a certain amount of play,

page_text: so that the latter does not exercise a brake action. But if the hand-chain should
be released, so that the load causes the wheel to revolve backwards, the tappets n,
under the action of the inclined surfaces, will cause the pulley i also to move
back, so that the friction pulley e will be pressed against the rail g of the frame,
thereby checking the motion of the axle b, or in other words applying the brake
to the pulley block.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. A pulley block having a pinion adapted to be thrown out of gear by a pull
on the hand-chain, and a brake device adapted to act on the hand chain wheel when
the latter is turning backward, substantially as described and for the purpose
specified.
2. The combination and arrangement of mechanisms or parts constituting a
pulley block, substantially as described and illustrated by the accompanying
drawings.
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2000