Year: 1886

page_text: I, ARTHUR COOE HATTATT of Amherst Villa, Castle Road, Newport, Isle of
Wight Gentleman do hereby declare the nature of this invention to be as
follows:-
The object of the invention is mainly to permit of ships boats being carried
"inboard" and yet allow of their being at once lowered just as freely as when
suspended outboard from ordinary davits.
To effect this in place of making the davits with an upright swivelling stem
with a crane neck at the top from the end of which the boat is suspended and
turning the davits into a position either to carry the boat inboard or outboard
ready to be lowered I mount the stems of the davits as before in sockets at the
side of the vessel but without allowing them to turn in the sockets and in place of
making the stems vertical I make them to curve or incline inwards so that the
upper end of each davit from which the boat is suspended, comes above the deck
of the vessel at a sufficient distance inboard to allow of the boat suspended from it
being inboard and much in the same position that it would be when carried
inboard on the ordinary davits
In order to allow of a boat suspended from davits of this kind being lowered
into the water and carried clear of the vessels side as it is being lowered I fix the
lower block of each of the tackles used for lowering the boat to the end of an arm
which for a distance is led horizontally inboard and then when clear of the side of
the boat carried downwards towards the deck of the vessel and is at its lower end
coupled to a pin joint carried by a projection from the stem of the davit. This
joint may be at any desired height above the deck of the vessel. When the boat
is lowered from the davits the arm turns around the pin joint at its lower end and
carries the lower block from which the boat is suspended outwards away from the
side of the vessel so that the boat as it is lowered descends well away from the
vessels side. The arms work close to the side of the stems of the davits and
between them and a fixed guide bar so that they are always kept in the same
vertical plane as the davits and to prevent the arms from twisting at the joints
at their end I make each arm square or oblong in cross section where it works
between the guide bar and the stem of the davit.

page_text: When the boat has been raised and is held suspended at the head of the davits
I raise up below it moveable chocks or supports to come under the inner and outer
sides of the boat and support it.
The chock or support to come. under the outer side of the boat I form as a bell
crank one arm of which when the chock is raised bears against the side of the keel
of the boat and the other against the bottom of the boat.
In this way when the chock has been lowered a short distance it can turn into
a position which does not interfere with the lowering of the boat.
The chock or support to come under the inner side of the boat I form in one
piece with a trough shaped piece which when raised is to embrace the keel of the
boat and I hinge the outer chock to the short outer side of this trough piece.
The trough piece I raise or lower by a screw or lever and to prevent the trough
piece from turning I form the inner chock which is fixed to it with a projection
which works between guides carried by the davit.
When the boat is supported upon the chocks or supports it may be further
secured by grips or lashings passing across the top of the boat from a chock or
support on one side of the boat to a chock or support on the opposite side.
To disengage the boat when it has been lowered I use by preference disengaging
hooks formed with a weighted arm extending from each hook tending to turn the
hook into a position to disengage it whenever the hook is released from the strain
of the load previously hanging suspended from it, either a single hook of this kind
may be used or they may be used in pairs one turning to disengage itself in one
direction and the other in the opposite direction. In either case the ends of the
weighted arms may be formed into eyes through which a line may be threaded to
tie them together and so prevent the hooks from turning to disengage themselves
until the tie is released. The releasing of the tie may be effected simply by a pull
on the end of the line so that any one in the boat can keep the boat suspended on
the hooks until such time as he chooses to pull the line and thereby set the hooks
free to release themselves when the boat is resting in the water.
In place of the hooks being disengaged by means of the weights on the arms
they may be disengaged by turning the arms by hand.
The lower block of the tackle I form with a handle at the side by which it can
be held so as to avoid accidental injury to mens fingers when holding the block as
the boat is being lowered.
The hooks I make to catch into a link of a chain carried up from the keel of the
boat through one of the thwarts and I prevent this link from dropping down when
the hooks disengage themselves by stops placed across the thwarts and which come
below projections from the link.

page_text: and Disengaging Ships' Boats.
I ARTHUR COOE HATTATT of Amherst Villa, Castle Road, Newport, Isle of
Wight, Gentleman 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 object of the invention is mainly to permit of ships boats being carried
inboard and yet allow of their being at once lowered just as freely as when
suspended outboard from ordinary davits.
Hinged davits of various kinds have been used, for effecting to some extent this
object, but the use of davits of this kind is attended with various disadvantages.
I use fixed davits from the head of which the boat is suspended at any desired
distance inboard preferably in much the same position that it would be when
carried inboard on ordinary davita
In order to allow of a boat suspended from davits of this kind being lowered into
the water and carried clear of the vessels side as it is being lowered I connect the
lower block of each of the tackles used for lowering the boat to the upper end of
an arm which at its lower end is free to turn on a pin joint. This joint may be
at any desired height above the deck. of the vessel. When the boat is lowered
from the davits the arm turns downwards with it and carries the lower block
outwards away from the side of the vessel until the arm comes into a horizontal
position or nearly so the block is then free to descend without the arm and the
boat hanging from this block is lowered well away from the vessels side.
When the boat has been raised and is held suspended at the head of the davits
I raise up below it moveable chocks or supports to come under the inner and outer
sides of the boat and support it.
The chock or support to come under the outer side of the boat I form as a bell
crank one arm of which when the chock is raised bears against the side of the keel
of the boat and the other against the bottom of the boat.
In this way when the chock has been lowered a short distance it can turn into a
position which does not interfere with the lowering of the boat.
The chock or support to come under the inner side of the boat I form in one
piece with a trough shaped piece which when raised is to embrace the keel of the
boat and I hinge the outer chock to the short outer side of this trough piece.
The trough piece I raise or lower by a screw or lever and to prevent the trough
piece from turning I form the inner chock which is fixed to it with a projection
which works between guides carried by the davit.
T▸

page_text: When the boat is supported upon the chocks or supports it may be further
secured by grips or lashings passing across the top of the boat from a chock or
support on one side of the boat to a chock or support on the opposite side.
Figure 1 of the drawings hereunto annexed shows a perspective view of
apparatus constructed as above described. The boat is shown to have been
partially lowered and brought below the bulwarks.
A A are the davits the stems of which in the construction shown in this figure
may be carried in sockets either on the outer or inner side of the bulwarks they
are shown to be carried on the inner side of the bulwarks. The davits are as
shown made to incline inwards and are then curved over swan-neck fashion to
bring their ends into position to allow of a boat being suspended from them.
B are the arms or struts which serve to carry the lower blocks of the tackles
outboard when the boat is being lowered-these arms turn on pins at C. The
pins may either be carried as shown or by brackets from the deck or in other
suitable way. D are the ropes by which the boat is suspended. One end of each
--rope is secured to one of the lower pulley blocks it is then carried up through an
eye E at the end of the arm B then over a guide pulley F carried by the arm and
over one of the pulleys of the upper block then around the pulley of the lower
block and afterwards upwards and over the second pulley of the upper block.
If the boat is so heavy as to require three or four sheave blocks the required
number of sheaves are arranged to be carried at the end of the arm or strut B.
To couple the lower block to the end of this arm so that the arm shall turn down-
wards with it when the boat is being lowered I provide 'teeth at the end of the
arm to engage as is shown on a somewhat larger scale at Figure 2 with teeth on a
crescent shaped link G to which the lower block is attached. When the boat is
being lowered and the arms or struts have been turned down into or beyond a
horizontal position as shown at Figure 1 the teeth of the link G become disengaged
from the teeth at the end of the arm and the boat can be further lowered the thrust
arm keeping the tackle and boat well clear of the vessels side. In place of the
toothed link shown at Figure 2 a short length of chain such as shown at Figure 3
might be used or other means might be adopted for coupling the lower block to the
end of the arm whenever it has been drawn up to it.
H, H¹ are the moveable chocks or supports for supporting the boat when it has
been raised to the head of the davits. The inner support H can simply be raised
or lowered by the screw I and is formed. not only to bear against the inner side
of the boat but also to embrace the keel. The outer support is hinged to the
support H-it is a two armed lever the longer arm H¹ of which is to come against
the lower part of the outer side of the boat and the shorter arm against the keel
When the boat is off the chocks the arm H¹ hangs downwards in the position
shown.
When the boat has been raised to the head of the davits and the chocks are
raised by turning the screw I the shorter arm of the lever comes against the
bottom of the keel and as the chocks continue to rise the lever is turned on its
centre until the arm H¹ comes against the underside of the boat and the shorter
arm against the side of the keel.
Figure 4 shows a modified form of the apparatus. In this modification the davit
stems are straight and fixed vertically to the deck of the vessel-pairs of curved
guide bars are carried from the stem to the bulwarks-the arms B work between
these bars. In this figure I have also shown a pawl K to engage with rack teeth
formed on the back of the arm B. When the boat is being lowered this serves to
prevent the boat after it has been somewhat lowered and carried a distance out-
board from again swinging inboard if the vessel is rolling. In other respects the.
construction is the same as shown at Figure 1. A plan view of the top of the
arm B is shown at Figure 5. Any suitable arrangements may be employed for
connecting or disconnecting the lower blocks with the boat.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. The combination of fixed davits A and arms or struts B for thrusting out-
board the lower blocks of the tackles as the boat is lowered substantially as
described.
2. The moveable chocks or supports for the boat formed substantially as
described.
3. The construction of apparatus for raising and lowering boats substantially as
described.