Improvements in Ships' Davits.
Year: 1890

page_text: Date of Application, 2nd May, 1890
Complete Specification Left, 7th N v., 1890-Accepted, 13th Dec. 1890
PROVISIONAL SPECIFICATION.
Improvements in Ships' Davits.
I WILLIAM HENRY PENLIGEN of 52 Louis Street Spring Bank Hull Master Mariner
do hereby declare the nature of this invention to be as follows
-
The object of my invention is to provide davits for hoisting and lowering boats that
shall be perfectly trustworthy at all times and quick and easy in action.
I use two davits for each boat but as they are exactly alike 1 will here only explain
one.
To oach davit I fix upon deck two standards or stanchions carrying each a
plummer-block in which revolves a shaft.
These standards are placed as close as practical to each other and upon the shaft the
davit is fixed. The lower part of this davit is semi-circular, the centre of which is
formed by the shaft, and the outer quadrant is toothed to engage into a small toothed
wheel carried on suitable bearings by the standards lower down. To the shaft of the
small toothed wheel outside the standards is fitted a heaving wheel for actuating my
apparatus. Upon the semi-circular part before mentioned chocks are arranged for the
boat to sit in.
The upper part of the davit which is fitted with sheave and pulley, is very similar
to those now in use and is fixed on to the lower part with a curved brace.
The whole is arranged with a suitable stop action to fix the davits in the required
position when the boat is at rest. It will readily be seen that when the heaving wheel
is moved the small toothed wheel acting upon the cogged quadrant throws the davits
over the ship's side and the hoaf is thus at once lowered into the water.
As my improvements are capable of some modifications without departing from the
principle thereof 1 do not restrict myself to material, dimensions, or to the precise
form or placement of the parts thereof.
1
an
RAYNER & CASSELL,
37, Chancery Lane, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Ships' Davits.
I WILLIAM HENRY PENLIGEN of 52 Louis Street Spring Bank Hull Master Mariner
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 has for its object to provide davits for hoisting and lowering boats on
and from board ships which will be much more rapidly and readily operated than hereto-
fore so that two men may be able to lower a boat in two minutes; the said davits being
so constructed and arranged that they are not exposed to injury or destruction in
collisions by a heavy sea or when the vessel is going in or out of dock.
The essential feature of my invention is to be able to turn a boat outboard without
hoisting that is to say by simply depressing a lever which releases the movable chock
holding the boat normally in position, and by turning a crank handle.
My improved davit consists of a standard carrying a sbatt mounted thereon, in
suitable bearings and upon which turns a semi-circular frame or quadrant partially
toothed upon its circular and lowermost edge. This frame has an upward extension
or bracket on one side to which as well as to a portion of its lower circular edge is
rivetted the davit proper, this davit being curved at the top in the usual manner and
braced thereat by means of a diagonal bar. The said standard curries moreover upon

page_text: a lateral extension or bracket as well as on its centre, the axis of a worm wheel gearing
with the teeth of the semi-circular frame aforesaid, and set in motion by a crank
handle.
Suitable tackle falls and sheave blocks are provided to list and lower the boat,
while a ladder is fixed to the standard to gain access to the boat from deck.
The latter is normally held in position above deck by two chocks, a fixed and
a movable chock. The former is secured to the inner curved edge of the upright
extension or bracket of the semi-circular frame, the latter is fixed to one arm of a
rank lover mounted upon the shaft aforesaid, and the other arin of which forms a
handle.
In the accompanying drawings
Fig. 1 is a side elevation of a portion of a boat secured to one of the davits.
Fig. 2 is an end view partly in section of the same.
Figs. 3 and 4 are respectively a horizontal section on line re of Fig. 1 and a
plan of the standard alone.
"
which
d is the standard furnished with the lateral extension or bracket
supports one end of an axis provided with a crank handle the other end of
which rests in bearings formed upon the front end of the standard proper and
carries a worm wheel gearing with the teeth 7 of a semi-circular frame a.
The latter is mounted at its horizontal and upper part upon the shaft g supported
by a plummer block, so as to turn freely therewith, and is moreover providual with
an upper extension or bracket a to the front edge of which is secured the fixed
chock The davit proper 6 is rivetted upon the outer end of the bracket_a',
and of the frame a, it is curved at the top in the usual manner and is braced as
shown by means of the bar h. B is the boat held normally in position between
the two chocks and, the latter of which serves to luck it when not in use
and to release it when required. This chock is fixed to a plate or arm # of n
erank lover pivoting on the shaft and the other arme of which forms a handle
by means of which the chock is locked or released, the said handle being secured
in a hook and held therein by a screw or in any other suitable manner. // is
the tackle fall and im and mi are shenvo blocks, the block m being fixed to the
stem of the boat B, while the block m, carries a hook by means of which it is
suspended to the ring at the top of tho davit.
When it is required to release the hont B the handle e, is disengaged from its
hook and the chock, which acts as a counterweight, drops down and releases
the boat. The bandler being now rotated, the toothed frame a, turns, and the
davit with it, until the boat is held overboard, when the crew now clambers in
it with the aid of the ladder & and the hoat is lowered by turning the handle a
and unwinding the tackle-fall from the drum or barrel o. The ratchet wheel s
prevents the pinion from turning in the wrong direction.
Having now particularly doscribed 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 :-
(1) The improved ships' davit arranged and constructed substantially as herein
described and illustrated in tho accompanying drawings.
(2) The mechanism for turning the boat overboard without hoisting consisting of a
toothed semi-circular frame gearing with a pinion actuated by a handle in combination
with a standard substantially as and for the purpose described.
(3) In ships' davits holding the boat between a fixed and a movable chock, tho
latter being actuated by a crank lever pivoting on the shaft upon which the davit
Turns substantially as and for the purpose describel.
Dated this 4th day of November 1890.
RAYNER & CASSELL,
87. Chancery Lane, W.C.. Agents for the Applicant.