IMPROVEMENTS IN APPARATUS FOR CARRYING, LOWERING, AND DETACHING SHIPS' BOATS "
Year: 1883

page_text: LETTERS PATENT to James Harold Barry of 33 Southampton Buildings,
London for an Invention of "IMPROVEMENTS IN APPARATUS FOR CARRYING,
LOWERING, AND DETACHING SHIPS' BOATS "
PROVISIONAL SPECIFICATION left by the said James Harold Barry at the
Office of the Commissioners of Patents on the 16th August 1883.
JAMES HAROLD BARRY of 33 Southampton Buildings, London "IMPROVEMENTS
IN APPARATUS FOR CARRYING, LOWERING, AND DETACHING SHIPS' BOATS."
This Invention relates to improvements in apparatus for carrying, lowering, and
detaching ships' boats and consists Firstly Of a davit which is bent until the head
is from 12 to 24" beyond the centre line or pivot whether on the deck-rail or ships'
side so as to carry out the boat when released beyond such centre. The upper part
of the davit is bent inwards to a suitable angle until it reaches the boat's inner rail
when it curves round and takes the shape of the boat to the keel after which it
descends in a straight line to the hinge joint or pivot which is made with a crano
foot or knuckle joint and of a tee shape or other convenient form-I fit such
hinged foot at a point varying from a point immediately in line with the boat's
keel to a point in line with her inner bilge which owing to the angle at which the
head of the davit is bent the boat when released draws out the davit and so causes
it to act automatically-A metal flange is formed on the hollow part of the davit
and lined with wood so as to prevent the boat chafing while to complete the grip
of the boat an outer arm bent to a suitable curve is pivotted to the davit just
beneath the boat's keel and secured by an anchor slip or by an improved releasing
gear which releases this and the corresponding arm fitted to the davit at the other
end of the boat simultaneously
In order to permit the davit working freely so as to ensure the boat swinging
clear of the ships' side I employ a telescopic slide which is fitted either on the
inner or outer side of the davit which latter may either be worked by tackles or
with steam-hydraulic or pneumatic power-When so worked by power the
telescopic slide may be dispensed with

page_text: To lower the boat when out I employ two sheaves made fast on a spindle and
furnished with corrugated sides and grooves to nip the rope These sheaves aro
locked together vertically and controlled by a brake which keeps the boat's falls
fast until they require to be slacked up and with this lowering gear either a single
rope or the boat's falls may be used
To detach the boat when lowered the lower blocks or rope are or is attached
to slip links so constructed and connected that they are readily hooked on and
cannot be detached except by hand or automatically when the boat is waterborne
A davit of corresponding construction and furnished with similar lowering and
detaching gear to that above described is fitted at each end of the boat and the
two davits are connected by jointed rods or chains-When the former are used and
the davits are worked by tackles I fit such connecting rods with a grip pulley
suitable for either chain or ropo
If desired the bent upper arm of the davit may be dispensed with when its
curved lower arm in combination with the movable outer arm will then form a
chock for carrying the boat

page_text: SPECIFICATION in pursuance of the conditions of the Lottors Patent filed
by the said James Harold Barry in the Patent Office on the 16th February
1884.
:
JAMES HAROLD BARRY of 70 Bishopgate Strect in the City of London Master
Mariner IMPROVEMENTS IN APPARATUS FOR CARRYING LOWERING AND DETACHING
SHIPS BOATS.
This Invention relates to improvements in Apparatus for carrying lowering and
detaching ships boats and consists firstly of a davit which is bent until the head A
is from 12 to 24 inches beyond the centre line hinge or pivot whether on the
deck M rail L ships side Ps or skids K so as to carry out the boat when released
beyond such centre. The upper part of the davit from A to D is bent inward to
a suitable angle until it reaches the boats inner gunwale at D when it curves round
and takes the shape of the boat to the keel at E after which it descends in a straight
line to the hinged joint or pivot from E to B which is made with a crane foot or
knuckle joint as at B or of a T shape or other convenient form
1 fit such hinged foot at any point inside the overhang of the davit head while
owing to the angle at which the head of the davit is bent the boat when released
draws out the davit and so causes it to act automatically A metal flange or seal
is formed on the hollow part of the davit from D to the keel of the boat and
lined with wood for the boat to rest on so as to prevent the boat chafing while to
complete the grip of the boat an outer arm or chock C bent to a suitable curve is
pivotted to the davit immediately beneath the boats keel and secured by an anchor
slip F or by an improved releasing gear as shewn at Fig 13 (Sheet 1) which consists
of a crank action (a) worked by a handle (b) and connected by a rod at (c) which
releases this and the corresponding arm fitted to the davit at the other end of the
boat simultaneously. This rod is formed with two vertical cranks (a) on it and
is worked or turned by a handle (b) at either end
In order to permit of the davit working freely so as to ensure tho boat swinging
clear of the ships side I employ a telescopic slide or cylinder G H which is fitted
either on the inner or outer side of the davit which latter may be worked by tackles
or with steam hydraulic or pneumatic power When so worked by power the
telescopic slide may be dispensed with and a cylinder and piston substituted The
drawings (Sheet 1) show six forms of davit Figs 1 2 3 4 5 and 6 Fig 1 being fitted
with the cylinder or slide G H on the outside of the davit working in a hinge joint
at the davits below the keel of the boat at E and also hinged and working freely
at the waterway this davit after being curved from the hoad A in round the bilge of
the boat to the keel descends in a straight line to the deck and is binged or pivotted
at B The chock C is then fitted at E and working on the pin P it is then carried
down to the releasing rod at F on the davit thus completing the combination of
single hinged davits and chocks The rods connecting these davits are formed with
universal joints in order that should one davit be lowered out before the other the
rods would not be carried away as if they were fixed
Fig 2 Shows the same form of davit hinged outside the ship at Ps with slide or
cylinder GH fitted to the quarter of the davit being actuated at D by tackles
when power is not used.
Fig 3 Is an ordinary davit A S working in socket R said socket being hinged
at B and controlled by slide or cylinder G H which permits of this form of davit
being worked by tackles at D. It may also when required be turned from A
to a a as shewn by dotted line Working in conjunction with this form of davit
are the chocks Cand C the standing part C being fixed to the rail L the moving
part C² being released at the slip F and may be shipped or unshipped as required,

page_text: Fig 4 Also shews ordinary davit hinged at B on the deck M and controlled by
the slido or cylinder G H from the skid K the chock in conjunction with this davit
being half wood and half iron or the old pattern converted
Fig 5 is placed on skids K with slide or cylinder GH to the shoulder of the
davit and the chock C released at F by the crank action before mentioned.
Fig 6 Is fitted into the ordinary skids K and not on them as at Fig 5 and
though fitted with slide and cylinder is so far different to the others being
actuated by chain pulleys to the skids and round the sheaves J which are of the
same description as those forming the lowering gear viz Corrugated on the inside
if to work with rope and the ordinary chain sheaves if chain is used these sheaves
are connected together by a rod on which they are fixed thus ensuring the davits
working together by tackles hooked at D.. The chock or crutch C is slipped at F
simultaneously with the one at the other end of the boat
To lower the boat when out I employ two sheaves made fast on a spindle and
furnished with corrugated sides and grooves to nip the rope these sheaves are
locked together as at A¹ Fig 1 Sheet 2. and fixed on a plate P which is secured to
the bulwarks or waterway by screws at S the ropes for lowering or boats falls are
first taken through snatch blocks Z at Fig 2 (Sheet 2) on the waterway then
round these sheaves. A¹ then back over suitable rollers N° 1 2 and 3. and finally
secured by a brake at B. by which the lowering is regulated. This brake may be
either excentric or differential which keeps the boats falls F fast until they require
to be slacked up and the boat lowered
To detach the boat when lowered the lower blocks or ropes used for lowering
are attached to slip hooks as shewn in figs 3 and 4 (Sheet 2) so constructed and
connected that they are readily hooked on and cannot be detached except when
the boat is water borne-she is then freed automatically or may be released by hand
These hooks are fixed together on a span of chain or wire rope S to which is fitted
a roller at one or both ends, by which means the action of hoisting the boat sets
up the span and it is kept taut by a locking pin p. that passes through between
the links of the chain Tat R in the roller RL These hooks are formed by the
falling piece B being fitted and hinged at Pa between two plates C and held in
position by the hooked catch A While there is any strain on the ring at Rº the
ring or shackle at E when hooked on at A lifts the catch A when the strain is
taken off at R' and allows the piece B to fall to the dotted line and thus releases
the boat Form of hook Fig 4 (Sheet 2) the falling piece B is secured at the
point by the catch A and in all other respects is same as Fig 3. (Sheet 2) A davit
of corresponding construction to that above described in Figs 1 2 3 4 5 and 6
Sheet 1. and furnished with lowering and detaching gear as above described is
fitted at each end of the boat and the two davits are connected by chains wire
ropes or jointed rods which allow of each davit moving or working before the other
without breaking such connection Hinged chocks are also used togethor with
these davits in order to support the boat and are somewhat similar to the davits
above described with the bent upper portion removed These chocks are shown
at Figs 7 8 9 10 11 and 12 in Sheet 1 of the drawings These chocks can also be
used separately or with davits such as are now in ordinary use
Fig 7 (Sheet 1) is formed of two parts the falling arm B is released by the
crank at D the part marked A being a fixture
Fig 8 (Sheet 1) shews both arms of chock A B hold in position at D by a slip
catch D' and released by it and shews the position of boat above ships rail R
Fig 9 (Sheet 1) Shows the chock on skids or hurricane deck H the outer arm
is held by the supports CC and released from underneath at D while the Arm A is
rigid until released at F
Fig 10 (Sheet 1) is formed by two moving pieces B and B¹ the latter is hinged
at H and works with the outer arm on the pin P and whon released by an
anchor slip or the crank action shewn at D the whole chock falls from beneath
tho boat

page_text: Fig 11 (Sheet 1) is the same as Fig 7 (Sheet 1) with the exception that tho
inner arm A is held in place by the support F and released in the same manner
as Fig 7
Fig 12. (Sheet 1) Shows the present chocks cut through at X and hinged under
the keel the falling part B is held in position at D when actuated by the crank
action a Fig 13 (sheet 1) which allows it to fall The part lettered A being fixed
as now in use on the skid S from the hingo at the boats keel to the inner bilgo of
the boat
Having now fully described the whole of my system for carrying putting out
and lowering and detaching boats I would have it understood that I do not claim
hinged davits or chocks generally but what I claim is
Firstly A single davit where the point of suspension is outside that of the hingo
at its foot and controlled by a slide or cylinder
Secondly The construction of davits substantially as described so that they can be
worked and controlled by Steam Hydraulic or pneumatic power
Thirdly The combined arrangement of davits connected by rods with flexiblo
joints falling chocks and releasing gear substantially as described
Fourthly The chocks substantially as described and shewn at Figs 7 8 9 10 11
and 12 (Sheet 1)
Fifthly The lowering gear substantially as herein described Figs 1 and 2 (Sheet 2)
Sixthly The releasing hooks as shewn at Figs 3 and 4 Sheet 2
In witness whereof I the said James Harold Barry have hereunto set my hand
and seal this Sixteenth day of February in the year of Our Lord One thousand
eight hundred and eighty four.
RA
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