Improvements in Apparatus for Carrying Ships' Boats.
Year: 1888

page_text: Date of Application, 22nd Nov., 1888
Complete Specification Left, 21st Aug., 1859-Accepted, 21st Sept., 1889
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Carrying Ships' Boats.
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:
This invention has for its object improvements in apparatus for carrying ships
boats.
In order to facilitate swinging the boat outboard and inboard I provide a worm
wheel upon the davit and a worm engaging with it. The worm is horizontal and its
necks are carried in bearings on a fixing attached to the rail. A hand wheel is
fixed upon the neck of the worm on the inboard side and by this the worm is
turned.
This gear is self locking so that the davit requires no gyes and in swinging the boat
one man is able to turn the davit and keep it under control. Both of the davits may
be fitted with this self locking gear or only the after davit may be so fitted, the fore
davit being arranged to be turned by a lever passing through a hole in the davit
immediately above the rail. Gear wheels may also be employed to facilitate turning
the davits. Davits to which levers are applied or which are not provided with self
locking turning gear may be locked by a pawl engaging with notches in a flange
formed upon the davit so as to render the use of gyes unnecessary.
This locking
gear may be at the foot of the davit or at the rail. A pin may take the place of
the pawl.
The lower end of the davit should be of hard material and hemispherical; it is
received into a corresponding foot step in which it bears upon a convex or flat
surface.
To secure the boat when hanging from the davits an upright is provided midway
between the davits. Lashings attached to the heads of the davits are brought together
and attached to a single line which is rove through a block on the upright. By this
line the lashings are hove taut beneath the boat and the line is made fast at a cleat.
On letting go the line the lashings are at once cast free and the upright which is
simply held by a clip to the rail, can be laid down out of the way.
For boats which are stowed upon chocks I arrange the chocks to be raised by
rack and pinion beneath the boat. One jaw of the chock is movable about an axis
parallel to the keel of the boat. When the chock is raised into position the inner end
of the moveable jaw comes against the keel of the boat and the outer end of the jaw is
thus raised until it bears against the floor or bottom of the boat and so the chock
holds the boat securely but directly the chock is lowered a short distance the moveable
jaw falls away and leaves the boat free.
ARTHUR C. HATTATT.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Carrying 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 :-
In order to facilitate swinging the boat outhoard and inboard I provide a worm
wheel upon the davit and a worm engaging with it. The worm is horizontal and its
necks are carried in bearings on a fixing attached to the rail. A hand wheel is fixed
upon the neck of the worm on the inboard side and by this the worm is turned.
D
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page_text: This gear is self locking so that the davit requires no gyes and in swinging the
boat one man is able to turn the davit and keep it under control.
Figure 1 is a fore and aft elevation and Figure 2 is a side elevation of a davit
provided with self locking worm gear as above described.
a is the deck, b is the rail, c is the davit supported from the deck and rail in the
usual manner. d is a worm wheel fixed upon the davit. e is a worm engaging with
the worm wheel; it turns in bearings upon the collar f which forms the upper support for
the davit. h is a crank handle upon the neck of the worm; or in place of the handle a
hand wheel may be employed if preferred. Both of the davits may be fitted with this
self locking gear or only one davit may be so fitted, the other davit being arranged to
be turned by a lever passing through a hole in the davit immediately above
the rail.
This arrangement is seen in Figure 3.. i is a collar fast upon the davit and k is a
hole in the collar which receives the lever. The collar may be made in two parts
bolted together as is shown by the Figures 4 and 5 or it may be in one piece passed
on to the davit from the end and secured by a key. Both davits may be fitted with
the lever action.
Gear wheels may also be employed to facilitate turning the davits. This arrange-
ment is shown by Figure 7. is a bevilled wheel keyed upon the davit and m is a
pinion in gear with the same. The axis of the pinion m is carried in bearings upon
the collar which supports the davit. The pinion is turned by the aid of a lever as
shown or by a handle of other form.
In Figure 8 a side view of the gear is shown in connection with the after davit.
A hand wheel upon the axis of the pinion is here represented. The forward davit
is turned by the aid of a lever passed through a hole in the davit itself. Both davits
may be fitted with wheel gear.
Davits to which levers are applied or which are not provided with self locking
turning gear may be locked by a pawl, engaging with notches in a flange formed
upon the davit so as to render the use of gyes unnecessary. This locking gear may
be at the foot of the davit or at the rail or other convenient position. A plan of such
a locking pawl and other parts is shown at Figure 9. n is a fixing upon the rail or
other part and o is a forked pawl connected with the fixing n by a pin joint. p is a
collar secured upon the davit and having a projection on one side of it which the
pawl when down embraces. Figure 10 shows a modification in which the collar has
flat faces upon which the end of the pawl abuts. Figure 11 shows another modifica-
tion where the pawl takes the form of a filling piece entering between the flat upon
the davit and an abutment n' upon the fixing n. This locking gear is also represented
in Figure 3. Figure 12 shows another form where the collar has notches in it which
receive the nose of a pawl which drops into the notch and between supporting stops
upon the fixing. A side view of this collar is shown at Figure 13; it may be made in
one piece and passed on to the davit from the end, or it may be made in two parts
and clamped upon the davit as is shown in Figures 14 and 15.
The lower end of the davit should be of hard material and hemispherical; it is
received into a corresponding foot step in which it bears upon a convex or flat
surface.
In Figure 16 the convex lower end of the davit is seen resting upon a flat surface
within the foot step or lower bearing which is fixed upon the deck. In Figure 17
the end of the davit abuts upon a convex surface in the foot step the davit
end being also convex.. Figure 18 is similar to Figure 17 but the davit is: represented
with a flat under surface.
To secure the boat when hanging from the davits an upright is provided..midway
between the davits. Lashings attached to the heads of the davits are brought
together and attached to a single line which is rove through a block on the upright.
By this line the lashings are hove taut beneath the boat and the line is made fast at a
cleat. On letting go the line the lashings are at once cast free and the upright which
is simply held by a clip to the rail, can be laid down out of the way.
This arrangement is illustrated in Figure 8. q is a moveable spar, it is connected

page_text: with the deck by a joint at its lower end and it is held to the rail by a clip at q¹.
are the boat lashings descending from the heads of the davits and passing beneath
the boat. They are connected in the middle to a lines which is led up over a sheave
upon the spar at 9 and brought down and made fast at q'. Where the rail is of
insufficient strength I mount the spar q in a socket upon the deck as is shown in
Figure 19. Davits are also often fitted in similar sockets (when the rail is of
insufficient strength) in which case the rigid portions of the worm wheel or gear
wheel actions and locking gear would be formed in, or attached to the sockets.
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 with a davit substantially as described of a self locking turning
gear consisting of a worm wheel d, a worm e and a handle or hand wheel has
herein set forth.
2. The combination with a davit substantially as described of a turning gear,
consisting of a lever and a transverse passage receiving the same such passage being
in the davit itself or in a collar secured to it as herein set forth.
3. The combination with a davit substantially as described of a turning gear
consisting of a bevilled wheel and pinion and lever handle or hand wheel for turning
the axis of the pinion as herein set forth.
4. The combination with a davit substantially as described of a locking gear
consisting of parts represented by the annexed drawings.
5. The arrangement of the davit and its lower bearing or footstep as represented
by the annexed drawings.
6. The combination with davits substantially as described of securing gear consist-
ing of a moveable spar securely supported between the davits, and provided with a
sheave or block receiving a line from the lashings which when hauled tight is made
fast as herein set forth.
Dated this 17th day of August 1889.
ARTHUR C. HATTATT.