Improvements in Boats' Davits...
Year: 1895

page_text: Improvements in Boats' Davits...
I, FRANZ HENRICH STORM, of 94 Hammerbrookstrasse, Hamburg, Germany,
Navigator, 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 boats' davits heretofore usually employed have the disadvantage that a boat
hanging from them cannot, in case of accident or damage to the ship to which the
davits are applied, be hoisted out quickly enough.
Now this invention has reference to a construction of boats' davits designed to
obviate this disadvantage as I shall now proceed to explain by the aid of the
accompanying drawings, wherein
Fig. 1 is an end elevation, Fig. 2 a side elevation, and Fig. 3 a sectional view on
the line A B of Fig. 1 showing boats' davits according thereto. Each davit
comprises an arm b, made preferably of two suitably united frames, and provided
with four rollers a, and a support e, adapted to be secured on the deck of a ship at
right angles to the side thereof, this support being provided with a piece of similarly
curved slots or guideways that form oppositely inclined planes on which the
rollers a are arranged to travel. The two arms b, which serve to carry a boat, may
if necessary be suitably connected.
Normally the rollers a of each davit rests on the inclined plane farthest from the
corresponding side of the ship, in which position a boat hanging from the arms will
be over the ships' deck. When the boat is to be lowered over the ships' side, each
arm bis moved outward by suitable means such as a screw f, connected at one end
by a swivel joint to a block h, provided with trunnions 9 mounted in a fixed
bracket g', the screw passing at the other end through a nut l provided with pivots i
movable within slots k in the arın b. As will be seen, the arrangement is such that
after the arms 6 have been moved outward through rather more than half of their
travel by means of the screws f, the outer pair of rollers a will run down the
outwardly and downwardly inclined portions of the guideways thereby enabling the
arms to rapidly and automatically complete the remainder of their outward
movement under the action of their own weight in conjunction with that of the
boat suspended therefrom, the pivots i of the nuts then moving idly in the slots k.
The same automatic motion of the arms b, but in the reverse direction, will take
place when the arms have been moved through rather more than half of their
inward travel.
As will be obvious the rollers a might be replaced by slides, or correspondingly
arranged laterally projecting portions of the arms might be used without rollers or
slides. I prefer however the arrangement shown.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. A boats' davits in which the davit arnis are mounted in supports having
oppositely inclined guideways on which the lower portions of the arms or roller or
slides thereon can travel the arrangement being such that after the arms have been
moved in either direction through a part of their travel, they will complete the
remainder of their travel automatically under the action of gravity, substantially as
herein described.

page_text: 2. The improved boats' davits constructed arranged and operating substantially
as herein before described with reference to and shown in the drawings annexed.
Dated this 25th day of November 1895.
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.