Improvements in Bucket-elevators.
Year: 1893

page_text: Date of Application, 1st Feb., 1893-Accepted, 11th Mår., 1893
COMPLETE SPECIFICATION.
Improvements in Bucket-elevators.
I, JOHANN FRIEDRICH AUGUST FILLER, of 11 and 12 Pinnelbergerweg,
Hamburg-Eimsbüttel, in the Empire of Germany Manufacturor, 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 :—
My invention relates to a bucket elevator in which the change in the height to
which the material is to be raised takes place by means of tension pulleys
lengthening or shortening the bucket chains or ropes, the shaft bearings of the said
pulleys being adapted to slide in vertical guides and raised and lowered pro-
portionately to the displacement, effected by the driving shaft of the bucket
elevator, of lateral frames carrying the cage together with the lower chain pulleys.
Differing from the well-known elevators of the same class, these lateral frames are
not in direct connection with the shaft bearings of the tension pulleys, which are
lowered in their guides by the weight of the pulleys or by the aid of a special
weight, thereby effectually obviating the irregular raising and lowering movements,
which take place in the known elevators of this kind, and the one-sided jamming
of the rods carrying the lower cage. Owing to this arrangement the change in
the height to which the material is raised, and the descent of the cage into the
material which is to be raised, can be effected continually by mechanical means and
in proportion to the quantity raised and the kind of the material which is to be
raised.
A portable bucket-elevator fulfilling this object is represented in the accom-
panying drawing.
Figure 1 is a side view and
Figure 2 a front view of this improved elevator.
Figure 3 shows separately the weighted tension pulleys used for the chains and
adapted to slide in vertical guides.
With each of the two lateral frames hi carrying the lower cage e and guided in
Bockets which are fixed upon the base g of the frames I connect a chain which
is passed round pulleys and m supported on the outside of the elevator frame, and
is kept in tension by a weight attached to its free end. On the shaft m' of the
upper guide pulley m, and firmly connected with the latter, is arranged a ratchet
wheel o with which engages the pawl p of a lever q likewise adapted to turn upon
the shaft m'. This lever is moved to and fro in a suitable manner by the driving
shaft u of the bucket-elevator so that its pawl engages in every such movement
with another tooth of the ratchet wheel o and thus causes the frame hi carrying
the cage which supports the lower chain pulley c of the bucket elevator to move
gradually lower down into the space for the material to be raised, the chain k being
kept securely engaged with the teeth of the upper guide pulley m by the weight n.
By the descent of the cage e the bucket chains a are longthened, inasmuch as the
tension pulleys adapted to be displaced with their shaft bearings d'in_the
vertical guides of the frame are raised in proportion. But these tension pulleys
of the bucket chains a are under the action of the weight so that in the dis-
engagement of the pawlp from the teeth of the ratchet wheel o they will shorten
the bucket chains and raise the cage e to the highest position in a uniform manner
and without any jamming of the rods h in the sockets f.
For actuating the ratchet lever g I employ in the present case an eccentric
which is secured upon the driving shaft u and connected by the eccentric rod to
the suspended arm of the ratchet lever. As the point of application of the
eccentric rod on the ratchet lever can be changed it is evident that also the speed.

page_text: at which the cage is caused to descend into the material to be raised may be option-
ally varied according to the nature of such material, so that a special workman is
not required for regulating the descent of the cage as is the case with other known
elevators of this kind. In order to ensure in the improved elevator a simultaneous
upward or downward movement of the two frames hi carrying the cage e it is
expedient to provide a ratchet mechanism with a chain for each of the carrying
frames on the sides of the elevator framo.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A bucket-elevator in which the hoight to which the material is raised may be
varied by the bucket chains being automatically shortened by weighted tension
pulleya d adapted to be displaced in vertical guides, and lengthened by the down-
ward movement of the frames which carry the lower cage through the medium of
a chain k arranged on either side. of the elevator, which chain is passed round two
pulleysm held by the clovator frame and is actuated through the medium of a
ratchet mechanism connected with the chain pulloy m by the driving shaft of the
elevator, substantially as described.
1000
HASELTİNE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
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