A Catch-apparatus for Hoists.
Year: 1898

page_text: Date of Application, 25th Nov., 1898-Accepted, 14th Jan., 1899
COMPLETE SPECIFICATION.
A Catch-apparatus for Hoists.
We, SAMUEL BANDEL, Merchant, of 4, Kaiserstrasse, Konigshutte, Upper Silesia,
and CONSTANTIN KLINIK; Mechanic, of 36, Schutzenstrasse, Konigshutte, Upper
Silesia, do hereby declare the nature of our said 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 the present application is a wedge-catch apparatus for hoists and
lifts, which is situated below the centre of gravity of the hoist or lift, whereby
the load is caught in the most natural and advantageous manner. Hitherto
wedge catches even in the best catch apparatus, inasmuch as they work by braking
have been open to the objection that the wedges grip firmly during the braking
and they can only be applied to the upper half of the hoist and only allow of
the use of spiral springs sliding within one another and not sufficiently reliable.
Whereas the present invention permits the use of blade springs, always in opera-
tion and not serving at the same time as a support for the hoist. It is clear that
these contrivances as opposed to the present contrivance are at a considerable
disadvantage, as far as construction and effect are concerned. Of course this catch
may also be applied to the upper part of the hoist in which case it is also available
as a head guide.
The catch wedges are placed directly upon the blade springs partly tightened
by tightening screws s, and move in guides i which form the lower guide checks
of the heist. The fully released springs with their free ends directed upwards
reach as far as the wedge guide checks. Naturally iron guiding shafts are to be
employed. The accompanying drawing illustrates a method of carrying out this
contrivance in connection with a hoist and
Figure 1 is a side elevation of the catch contrivance with cable tight and there.
fore out of operation.
Figure 2 is a side elevation of the hoist when checked, and
Figure 3 is a vertical section.
A is the hoist, on the upper end of which two armed levers b, c have their bear-
ings so as to revolve on fixed blocks a. The outer longer ends 6 of the levers
are connected by means of the traction member e with the spring-cover F, to
which the cable is attached by means of the spring bolt fl. The method by
which the spring bolt fi transfers the power exercised by it to the spring cover
is clear from the drawing.
Besides the chains e and levers b, c the spring-cover is in direct power-trans-
mitting connection with the hoist A by means of the traction member K. The
load of the lift and its possible contents is attached simultaneously to the traction
member e and K and these as long as the cable e is still capable of action, assume
the position illustrated in Figure 1 in which the ends of the short lever arm c are
slightly over the guide eyes f. These inner arms c which are intentionally con-
siderably shorter than the arms b press by means of pressure rods g on the break
wedges h so that these are moved downwards and thereby by means of their guides i
moved away from the guiding rod k. By means of this downward movement of

page_text: the rod and wedges the blade-springs which are held firmly by the blocks m
are simultaneously tightened. The catch contrivance is illustrated in its checking
position in Figure 2. The hoist thus, in the position shewn, cannot fall.
In order that the springs on the one hand may not be unnecessarily strong
but that they may on the other hand while the hoist is in use, prevent excessive
vibration, the strong traction member K is provided which effects a direct trans-
mission of the load to the spring cover F.
In the case of hoists with two stages the wedges can be arranged so as to come
about half way up the whole hoist thus they can check the latter approximately
in a line passing through the centre of gravity horizontally. The lever arms c
being made considerably shorter than 6 give the advantage of rendering possible,
the use of proportionately strong although yielding springs 1, which as soon as
the cable breaks, impel the wedges with considerable force.
Especially by means of the arrangement of long flexible and yet strong springs
it is possible to force the wedges, and the rods which rest on them, upwards
in so short a time, (as soon as the cable breaks) that the hoist receives scarcely
any further acceleration from the action of the force of gravity beyond its inherent
motion.
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
Dated this on day of November 1090.
SAMUEL BANDEL, and
CONSTANTIN KLINIK.
By George Barker,
Fellow of the Chartered Institute of Patent Agents,
Agent for Applicants,
77, Colmore Row, Birmingham.