Improvements in Winches for use in Lifting and Shifting Loads.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in Winches for use in Lifting and Shifting Loads.
A communication from abroad by FRANZ ULLRICH and IGNAZ VOGEL, both
of Aussig, in Bohemia, Empire of Austria, Master Smith and Innkeeper
respectively.
I, WILLIAM PHILLIPS THOMPSON F.C.S. M.I.M.E. of the Agency for
Foreign Patent Solicitors 6, Lord Street Liverpool and 6, Bank Street,
Manchester both in the County of Lancaster & 323 High Holborn in the
County of Middlesex Civil 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 winch forming the object of this invention is shown on the annexed
drawings,
Figures 1 and 2 being two side views, and
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Figure 3 a front view with the plate a removed.
Figure 4 shows the doubly bent orank axle.
Figure 5 is a front view of the winch when the lever i is pressed down.
The winch consists of three vertical frame plates a', a', a³, which are held
together by means of. bars and support the whole apparatus.
The winch is actuated by means of an axle c revolved by hand cranks 1, which
actuates by means of the toothed wheel d, the wheel e which is keyed on a doubly
bent crank shaft Z supported by the side walls a', a*.
:
The pawls g g seated on the cranked parts f1f, which are at about an angle
of 180° to one another, are thereby moved up and down, and, as they engage
alternately in the teeth of a ratchet wheel S, the latter receives a backward motion.
These pawls are constantly pressed onto the ratchet wheel by the action of two
springs attached to the framo plates a¹ a³, so that the engaging of both
therewith remains continuously secured.
The axle A of the ratchet wheel S also carries the drum T which revolves
therewith and winds up the rope or chain o.
It is evident that in this arrangement the carrying rope can only be wound up
and therefore lift the load, but cannot in any case unwind and thereby allow the
load to drop.
In order however to allow this to be done a releasing levor i pivotted at 2 is
affixed to the wall a' which on being pressed down into the position shown in
Figure 5 removes both the pawls gg from off the ratchet wheel S whereby this
latter is released and can revolve backwards together with the drum T (through
the weight of the load hanging on the rope). As however in the case of heavy
loads this would take place at too high a speed, a brake arrangement is combined
with this winch, which regulates the speed of the drum as may be desired. This
consists of a block L made in one piece, surrounding the nave.n of the ratchet
wheel S and extending at the front into two arms j¹³ which are provided with
screw threads and may be pressed together by means of the screw spindle P and
thereby produce their brake action. If, on lowering the lever i, the load carried
by the rope drops too speedily, the arms are pressed together (screwed up)
by means of the screw spindle 1', the block L clasps firmly the nave of the ratchet
wheel which is prevented from making too rapid a revolution by the resultant
friction.
The arrangement of pawls has the further advantage that on the release of the
handles they cannot fly back, but on the contrary remain stationary in any
position.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to
me by my foreign correspondents, I declare that what I claim is :-
1st. A. winch for lifting and moving loads consisting of a doubly bent crank
rod Z carrying the toothed wheel e, on the bent parts respectively of which
crank axle a pawl g'g' is placed which conveys to the ratchet wheel S actuating
the drum Tabackwards motion, whilst by the lowering of a releasing lever
pivotted at the pawls are disengaged from the ratchet wheel, and the rope
carrying the weight may be unwound.
2nd. In a winch such as described in Claim 1 the arrangement of a brake device
consisting of a block L extending into two arms, which surround the nave n
of the ratchet wheel and may be pressed onto this nave by means of a screw
spindle P passed through the same.
•
1
WM. P. THOMPSON & Co.,
Agents for the Applicant.