Improvements in Ships' Boat "Davits."
Year: 1892

page_text: Date of Application, 3rd Mar., 1892
Complete Specification Left, 5th Dec., 1892-Accepted, 7th Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Ships' Boat "Davits."
I, JAMES SAMPLE, of Industrial Terrace, Wallsend on Tyne; in the County
of Northumberland, Engineer, do hereby declare the nature of this invention to be
as follows:-
The requirements of the Government regulations as to boat accommodation
nécessitates, especially in large vessels carrying passengers, a great number of
boats the side space occupied by which with the ordinary "davits" takes up a very
large portion of the vessel.
The object of my invention is to economise this space by an arrangement by
which two boats can be put out by each pair of "davits" which consist of two
upright "stanchions" secured to the deck and further stiffened by stays, the fore
and aft distance between them being a little more than the length of the boats, to
allow them to come quite inboard, and the height sufficient to accommodate two
boats one above the other. The swinging arms of the "davits" are placed the
same distance apart and their lower ends are carried in a "trunnion" piece the
"journals" of which work in bearings secured to the deck. Near their upper ends
these arms are bent towards each other and from the bent ends are suspended the
blocks to which the boats are attached; the object of so bending them being to get
á fair-léad of the tackle to the disengaging hook or other gear.
The bent heads
of the davits may be connected fore and aft by a chain or by a tie rod to give
them stability in that direction. Beyond their bent parts the swinging arms are
fitted with blocks from which tackles lead to similar blocks on the heads of the
upright "stanchions" and the ends of the falls are made fast to cleats.
Although I consider the bending of the heads of the swinging arms towards each
other an important feature, it might be in some case convénient to carry them
straight up to the blocks having a tie bar between them from which the lowering
blocks could be suspended in à fair lead to the boat.
When the swinging arms are "inboard" they are vertical, or nearly só, and rest
against a suitable frame as a support to which they may be secured when not in
use. When inboard the lower boat rests in "chocks' on the deck and the
upper boat hangs clear of it above in the tackles from the "davits" arñis.
"
In putting out the boats the " davits "swing "outboard" with the upper boat,
being quite clear of the lower one, when the boat is lowered into the water and
disengaged either by hand or by automatic gear and the "davits " then return and
lift out the lower boat.
The lifting in of the boats is effected in the same manner the first boat lifted
being placed in the "chocks
on deck.
Although I prefer to use ordinary blocks and tackle, as being more réliable
and in the hands of sailors easily worked, some mechanical means may be
"winch" worked
readily adopted, with or without blocks and tackle, such as a
by hand or power.
Dated this 3rd day of March 1892.
T. J. DANSON,
By L. W., per F. B.

page_text: COMPLETE SPECIFICATION.
Improvements in Ships' Boat "Davits."
1, JAMES SAMPLE, of Industrial Terrace, Wallsend on Tyne, in the County
of Northumberland, Engineer, do hereby declare the nature of said invention and
in what manner the same is to be performed to be particularly described. and
ascertained in and by the following statement :-
The requirements of the Government regulations as to boat accommodation
necessitate, especially in large vessels carrying passengers, a great number of boats
the side space occupied by which with the ordinary "davits" takes up a very large
portion of the vessel.
66
"
22
The object of my invention is to economise this space by an arrangement by
which two boats can be put out by each pair of "davits which consist of two
upright stanchions" secured to the deck and further stiffened by stays, the fore
and aft distance between them being a little more than the length of the boats, to
allow them to come quite inboard, and the height sufficient to accommodate two
boats one above the other. The swinging arms of the "davits are placed the
same distance apart and their lower ends are carried in a "trunnion" piece the
journals" of which work in bearings secured to the deck. Near their upper
ends these arms are bent towards each other and from the bent ends are suspended
the blocks to which the boats are attached, the object of so bending them being to
get a fair lead of the tackle to the disengaging hook or other gear.
The bent heads of the davits may be connected fore and aft by a chain or by a
tie rod to give them stability in that direction.
Beyond their bent parts the swinging arms are fitted with blocks from which
tackles lead to similar blocks on the heads of the upright "stanchions" and the
ends of the falls are made fast to cleats.
Although I consider the bending of the heads of the swinging arms towards
each other an important feature, it might be in some case convenient to carry them
straight up to the blocks having a tie bar between them from which the lowering
blocks could be suspended in a fair lead to the boat.
When the swinging arms are "inboard" they are vertical, or nearly so, and
rest against a suitable frame as a support to which they may be secured when
not in use. When inboard" the lower boat rests in "chocks on the deck and
2
"
the upper boat hangs clear of it above in the tackles from the *davits arms.
In putting out the boats the "davits" swing "outboard" with the upper boat,
being quite clear of the lower one, when the boat is lowered into the water and
disengaged either by hand or by automatic gear and the "davits" then return
and lift out the lower boat.
The lifting in of the boats is effected in the same manner the first boat lifted
being placed in the "chocks on deck.
"
Although I prefer to use ordinary blocks and tackle as being more reliable and,
in the hands of sailors, easily worked, some mechanical means may be readily
adopted, with or without blocks and tackle such as a "winch" worked by hand or
power.
DESCRIPTION OF DRAWINGS.
On the accompanying sheet of drawings I illustrate my invention as I prefer to
carry it into practical application without binding myself to the details of con-
struction nor to the use of manual or mechanical power.
Fig. 1 is a side elevation looking from outside the ship.
Fig. 2 is an end elevation, looking fore and aft on the ships deck, with the two
boats inboard" and
Fig. 3 is a similar end elevation shewing the davits with one of the boats swung
fully outboard" quite clear of the ships side and ready for lowering into the
6:

page_text: water and being detached from the blocks the other boat remaining in the chocks
on deck to be put out when required or alternatively representing one boat in the
chocks and the other ready to be swung "inboard."
A. A are the stanchions by preference sloping back fixed in the sockets B B cast
on bed-plates CC which also carry the brackets D D in which the swinging
arms E E are pivoted. These swinging arms are bent toward each other at their
upper ends and from their bent ends one of the boats is shewn suspended by
blocks F F fitted with tackles by which the boat is lowered into the water when
clear of the ships side as in Fig. 3.
At the heads of the stanchions A A are a pair of blocks G G with tackles which
pass to similar blocks H H on the heads of the swinging arms E E and by the tail
ropes of the tackles J J operated from the deck the arms F F are swing out as
shewn by Fig. 3 or brought in to the position shown on Fig. 2 when they are made
fast to the cleats K K on the stanchions the swinging arms E E then resting in the
jaws of brackets L L cast on the sockets B B and are secured each by a pin M
passed through the corresponding jaw, and the suspended boat is supported between
and may be further made fast by lashings to the two booms N N running fore and
aft on the stanchions. When the arms EE are swung outboard as in Fig. 3 they
rest in the jaws of supports OO fixed on the bulwarks so that in either outboard or
inboard positions there is little strain upon the tackles.
It will be seen that the bending of the heads of the swinging arms E E toward
each other secures a fair lead of the tackles of the blocks G G to the point of
attachment to the detaching hooks at the stem and stern of the boats whilst owing
to the consequent spacing of the davits apart the boats come completely "inboard
between them.
>>
The bent heads of the swinging arms may be stayed by a bar or by a chain stay
between them so as to give them greater lateral stability but probably this will not
be necessary.
The tackles for swinging the arms of the davits at each end may be joined into
one so that the two swinging arms may swing simultaneously by manual or other
power or they may be worked by manual power at each end independently which,
in the case of heavy boats, will give a considerable advantage in lifting leverage.
Having now particularly described 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 :-
1st. The improvements in swinging davits for ships' boats comprising the spacing
of the swinging arms so far apart as to be clear of the ends of the boats and bending
their upper ends towards each other so as to suspend the boats with a fair lead of
the blocks and tackles from the bent ends to the proper points of attachment at the
stem and stern of the boat and enabling, when required, two boats to be operated
by one pair of davits substantially as described.
2nd. The construction of such davits consisting of the several parts combined
and operating as shewn by the drawings herewith, comprising the stanchions A A
fixed in sockets B B secured to the deck, the swinging arms E E working radially
in the bearings D D and having their heads bent towards each other, the bracket
jaws L L to receive and secure the swinging arms E E when "inboard" the
gunwale brackets OO to receive and support the swinging arms when "outboard,"
the gripping or lashing booms N, the blocks G and H with tackles for operating
the swinging arms and the blocks F F with tackles for lowering and raising into or
out of the water.