Improvements in Apparatus for Lowering and Lifting Boats and the like.
Year: 1898

page_text: Date of Application, 17th Oct., 1898-Accepted, 22nd Apr., 1899
COMPLETE SPECIFICATION.
Improvements in Apparatus for Lowering and Lifting Boats and
the like.
I, JOHANN HEINRICH KLENCKE, of Mathildenstrasse 29, Bremen, in the
German Empire, Captain, 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 invention relates to apparatus for lowering and lifting ships boats and
other loads and has for its purpose to get a greater security in lifting and lowering
boats and the like, and to obtain a more equal lowering and an instantaneous
releasing of the load in such a manner that these operations are executed by
mechanical arrangements and independent of the ability of the crew.
On the accompanying drawing Fig. 1 shows the apparatus in front elevation.
Fig. 2 is a side elevation, and
Fig. 3 is a section through the braking apparatus.
As shown on the drawing the hitherto employed luffs are replaced by winches.
The winch shewn on the drawing consists of the drum a in the framing b
which is fixed to the davit D, and of mechanism for actuating the drum.
c is the crank turning by the geared wheels d e f the toothed wheel g sitting
loose on the drumshaft h. To the wheel g are attached three arms i catching
in to recesses of the screw nut 1.
A screw m mounted loose on the shaft his threaded through the nut 1. The
screw is solid with the ratchet wheel n which is held in position by the pawl q.
A second moveable friction
A friction disc is rigidly fixed on the shaft.
‹lisc P sits loose on the boss of the disc o and is held in its position by the three
levers connected to the wheel g and fitting into notehes of the disc. On the
crankshaft is also fixed a centrifugal brake s of any ordinary construction
put into action by turning the crank slightly backwards.
The apparatus works in the following manner:-
If a boat is to be lifted the necessary pressure between the friction discs o and p
is produced by turning the ratchet whcel n by means of a lever inserted into
holes w of the ratchet wheel, afterwards the toothed wheels d e f g are moved
by turning the crank c on the shaft r. By the arms i attached to g the nut lis
turned also and the friction disc p is further pressed against the disc o.
the shaft h with the drum a is turned, the rope is wound on to the drum and the
boat A will be lifted.
Thus
By a backward pressure on the crank c the weight, for instance the boat A,
will be lowered at a speed equally regulated by the centrifugal brake, while the
pawl is not engaged in the ratchet wheel n.
g
As soon as the boat has arrived near the water, the pawl q is, inserted into the
ratchet wheel n. Then the pressure of the descending weight turns the nut /
on the screw m backwards, the friction disc o is released and the toothed wheel g
with gearing and centrifugal brake is put out of activity and the drum with
shaft is turning alone. The rope is wound off from the drum by the weight,

page_text: and the boat arrives at the water, whereby the rope may be detached auto-
matically from the drum.
Commonly the boats are hanging on two such winches and their pawls may
be fixed on a shaft extending over the deck so that the pawls can be inserted
simultaneously by a lever fixed on the shaft, thus enabling the boat to be set
free at both ends at the same time.
This
At the side of the ratchet wheel na second ratchet wheel z with teeth in the
opposite direction may be placed as indicated by dotted lines on Figure 1. This
wheel also does not serve to arrest the lifted weight, but for the purpose of re-
storing the pressure of the sliding friction disc 2 against the fixed disc o.
is done by turning the crank in the direction for lifting the weight after having
inserted a pawl into the teeth of the second ratchet wheel z until the pressure
thus produced makes a further turning of the crank impossible..
A pressure on the crank in a backward direction and a slight pull on the
winding rope allows the disengagement of the second pawl, whereby the winch
is made ready for the safe lifting of a boat.
Instead of lifting the boat by means of the crank, this may be done by hand
chain-wheels t and u fastened on the crankshaft r.. For winding on a new or the
used rope a chain wheel is fixed. on the drum. shaft. These chain wheels are
worked by a crew on the lower deck underneath the boat deck. The rope is
conducted over, the guide pulleys ry of the davits D.
Having thus particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is
1. An apparatus for lowering and lifting boats and other loads on ships, land-
ing places and the like in which by means of one or more davits, cranes or out-
riggers furnished with winches, said boats or other loads can be lifted, swung
out and lowered in such a manner that by the pull of the load itself, and by the
action of a brake or ratchet wheel, the load can be made to descend and the rope
can be detached from the winch, substantially as hereinbefore described.
2. An apparatus for lowering and lifting boats and the like comprising davits
furnished each with a winch so arranged that a pawl 7 inserted in a ratchet
wheel n effects the detachment of the rope drum from the actuating mechanism
of the winch, whereby the boat A is allowed to descend by its own weight and
the winding rope is detached from the drum when required, substantially as
herein before described and illustrated by the drawings.
Dated this 13th day of October 1808
R. J. URQUHART,
57, Barton Arcade, Manchester,
Harrington Chambers, 24, North John Street, Liverpool,
Consulting Engineer and Patent Agent.