An Improved Davit and Gear for Raising and Lowering Boats.
Year: 1893

page_text: Date of Application, 2nd Dec., 1893
Complete Specification Left, 20th Aug., 1894-Accepted, 1st Dec., 1894
PROVISIONAL SPECIFICATION.
An Improved Davit and Gear for Raising and Lowering Boats.
I ALGERNON WILLIAM ABBOTT of Crondall Farnham Surrey, England,
Master Mariner, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved means of getting ship's boats out &
inboard.
For this purpose I provide upon the beams which are at present called skids &
used for stowing ship's boats, a davit constructed of iron or steel or other suitable
material; which davit is made in the following manner & shape, a bar of iron of
Buitable size & strength to suspend the boat from its extremity without bending, or
it may be built of angle irons to form a beam, this bar or beam is shaped to form a
semicircle at one end this being the head of the davit, the other or lower part of
the bar or beam or davit has made or bolted on to it a socket to serve as. a
pivot or hinge; this pivot or hinge is placed near the centre of the whole length
of the davit or beam, and the remaining part of the davit forms an elbow from
the pivot and is, then straight to within a few inches of the deck, in this
extremity of the davit are formed two eyes or rings to attach the tackles used
in raising or lowering the davit; the davit when inboard follows the shape of the
skid except where it forms a semicircle round the boat, the boat being when the
davit is inboard stowed over the davit & the pivot or hinge is 2 feet more or
less (the distance varying in proportion to the size of the boat) outboard of
the boat.
The foregoing describes one of a pair of davits which are attached to the skids.
of the ship; when the davits are used in pairs both extremities of the davits are
connected by an iron or steel bar which can be disconnected at will.
Instead of using the davits in pairs, 1 may use a single one & instead of the
beams or skids I may erect in their place à vertical pillar or girder, this pillar or
girder being erected to form a support for the pivot of the davit, when such is the case
I place & secure upon the davits themselves the chocks in which the boat rests &
underneath the innermost part of the davit I provide a vertical upright stanchion
having a crutch in its upper end into which the davit is lowered and secured when
inboard, and to form a support to the weight of the boat; when the boat is out-
board or being hoisted provide upon the stanchion before mentioned another
crutch in the reverse position of aforementioned into which the lower end of the davit
takes, & is secured by a pin or other means; this last mentioned crutch is also.
fitted to the skids of boats when they are used as a support.
With my davit I may use a lowering apparatus of a special design as follows;
instead of or in addition to the ordinary rope at present in use, I provide a steel flexible
wire rope of suitable size, this or the other rope is rove over pulley sheaves which
are placed at the pivotting point, the circular part of the davit, and in the head
thereof; the end of the rope is attached to the barrel of a small winch; this winch.
is attached to the pillar (vertical) or upright part of the skid and is of the following
description, two side pieces or frames which contain the barrel, at one end of the
barrel is fitted a band brake which is tightened by a wormed screw shaft to which
is attached a cross handle bar; at the other end or same end is a spur cogged wheel
into which engages a wormed shaft, this wormed shaft is fitted to disengage from
the cogged wheel by being fitted into an independent metal plate which is hinged
from a strap of metal secured to the end frame of the winch; the end that carries
the wormed shaft is in the form of a flap and has a slot in it, which takes over a

page_text: pin and is secured to the frame of the winch by a pin passing transversely through
that pin.
The wormed shaft is squared to allow of a handle bar being attached which
is revolved by those hoisting the boat & is disengaged when the boat is being
lowered.
•
As my improvements are capable of some modification without departing from
the principle thereof, I do not restrict myself to materials, dimensions, or to the
precise form or place of attachment of the several parts thereof..
D
11
ليمي
1
1000
A. W. ABBOTT,
Crondall, Farnham, Surrey.
An Improved Davit and Gear for Kaising, and Lowering Dua.
L, ALGERNON WILLIAM ABBOTT of Crondall Farnham Surrey England,
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:
This invention relates to an improved davit & means of getting boats out &
inboard.
:
i
For this purpose I provide upon the deck, beams, or skids, a davit made in the
following manner:
A bar or beam of iron, steel, or other suitable material & of suitable strength;
this bar or beam is bent to form a semicircle or segment of a circle round the boat
at one end, the other part is straight or bent as necessary; in or on the circular or
upper end is formed a place to take pulley sheaves or a pulley block; the lower
end is similarly fitted, and at or near the centre of the whole length of the davit is
a pivot or socket which is fitted on to a bar or shaft which bar rests in bearings on
the beams or skids & extends fore & aft upon them connecting the two davits, the
davits are fitted tightly or loosely on to this shaft as the case may be ;. when fitted
tightly the davits work together with the shaft in the bearings as a pivot, when
fitted loosely they work independently & on the shaft as a pivot.
I may use any other sort of a pivot & place my shaft or. pivot, anywhere along
the beam or skid, either under the keel of the boat, or outboard or inboard of the
boat, the davit being shaped accordingly.
>
This describes one of a pair of davits, but I may use them either singly or
in'pairs.
:
may also when in pairs or singly construct my davit in two pieces, the upper
part forming the bend one piece & the lower part which I shall refer to as the
lever another piece; in that case I shall key or otherwise secure them tightly to
the shaft forming the pivot; when in that form may use one or two levers, the
said levers being placed anywhere along the shaft; the pulley sheaves are fitted to
this form the same as for the other.
For the working of these davits I use rope or chain rove through the sheaves in
the lever or block & then rove through blocks fitted on the deck, the vertical part
of the skids or the sides of the ship, this forming a tackle which takes the weight
of the beat after the boat's keel has passed outside of the pivot out-board; to get
her in that position another tackle, is used one block of which hooks on to a lug or
ring fitted to the end of the lever & the other block on to a ringbolt or shackle in
or on the beam towards the centre of the ship.
:
The hoisting rope of the boat may be of ordinary rope or wire rope, when the
latter winches may be used; but in either case they follow the same leads, these
leads being placed on the bend of the davit & at or near the pivotting point.
The special winch mentioned in Provisional Specification I abandon & cancel.

page_text: The boat's chocks are of wood or iron, when of wood the outer chocks slide out.
as the boat pushes them with her & they are prevented from going altogether by a
piece of chain the ends of which are passed through holes in the beam, & then.
made fast one on each side of the chock, the bight of the chain underneath the
beam or skid.
When the chocks are iron;. the outer chock is worked by a wyper on the
pivotting shaft which works the chock automatically with the movement of the
davit.
:
1
}
The gripes, or lashings that secure the boat are fitted to work automatically to
release the boat from them upon the davit being moved to put the boat out; but
are placed by hand when the boat is being secured: For this purpose I provide a
bar or rod of iron resting in eyebolts or bearings, which bar goes under the boat.
from side to side & is placed on the side of the skids farthest from the bend of the
davits i.e. on the sides of the skids that face one another; on this bar are fixed
rigidly 3 projecting pieces or spurs, one for each of the lashings & one to serve as
a lever upon the projecting end of which the bend of the davit takes & secures.it
close down upon the skid or beam when the boat is inboard, in its chocks; the
davit has a projection on the bend which takes over this lever.
The lashings or gripes are of the usual pattern with a large link in the lower
end of the chain which the projecting pieces or spurs mentioned above pass.
through.
The movement of the davit first releases the lever, then as the boat lifts the
large links of the lashings lift the spurs & then slip off them when the boat is
being put out-board; when the boat is being secured the spurs have to be entered
through the links & the davit lowered down on to the lever piece; this automatic
gear is fitted to both skids & secures the lashings at both ends of the boat.
Instead of using beams or skids I may erect in their place a vertical pillar to.
form a support at each end of the boat for the shaft & davit to work upon; in.
this case secure the inner chock upon the davit itself, & to support the bend of
the davit I provide a vertical stanchion having in its upper end a crutch in which.
the davit rests & is secured, upon the side of this stanchion at its upper end I
provide another crutch in the reverse position to the one before mentioned that is.
with its mouth downwards; into this the lever of the davit takes when the boat is.
out-board.
Although I have only mentioned this davit as being worked by rope & tackle on
the lever, yet it is obvious that it can be worked by any mechanical appliance
fitted to the shaft or davits.
In the accompanying drawings in which like letters of reference indicate
corresponding parts,
Sheet I shows a side plan of the davit with the boat secured in its chocks upon
the beam or skids. Sheet II shows an end elevation.
Sheet III shows on a larger scale in a plan Fig. I & an end elevation, Fig. II..
the detail of the releasing gear for the gripes.
Sheet IV shows a side elevation of the outer chock when it is of iron.
In Sheets I & II a is the upper end of the davit, & the lower or lever end, c the
shaft that connects the two davits & serves as a pivot upon which the davits turn
resting in the bearings on the beams or skids d, e represents the wood upon the
skids & the chocks in which the boat rests, h is the putting-out tackle & ; shews
the blocks on the deck through which the rope reeves & into the block on the end
of the lever which forms the taking-in tackle; this tackle of course takes the
weight of the boat when putting the boat out after the boat's keel has passed over
the pivot; is the hoisting rope of the boat, the ring bolt in the beam for
hooking the block of the putting-out tackle on to, t is the securing pin that passes
through the blocks on deck & secures the end of the lever between them..
The gripes releasing gear is represented by k the rod or bar on which are the
two spur pieces m, & the lever piece n, this rod is carried in the eye-bolts 1, the
two spurs m pass through the big links o in the chain gripes u, the projection p on.

page_text: the davit a rests on the lever piece ; the links q are a fitting to render more
secure the gripes in case of bad weather or when a vessel rolls excessively, they
are placed over the points of the spurs m & have to be removed by hand before
the boat can be lifted; Sheet III shows a plan (Fig. 1) & end elevation (Fig. II)
of this.
Sheet IV shows a side plan of the outer chock when it is of iron, the wyper 9 is
secured on the shaft c, the arm w is slotted at one end & there is a slot in the
chock which is hinged at the point; upon the davit being moved the shaft c
actuates the wyper g
the end of which travels in the slot in the arm w, this releases
the chock & it drops as soon as the boat's keel rises above the hinge v.
Having now fully described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed, I declare that what ↳
claim is :-
:-
The improved davit & gear for raising & lowering boats; substantially as berein
described & shown in the drawings.
.
A. W. ABBOTT,
Master Mariner.