Improvements in Swinging "Davits" for Ships' Boats.
Year: 1895

page_text: Date of Application, 8th Jan., 1895-Accepted, 9th Mar., 1805
COMPLETE SPECIFICATION.
Improvements in Swinging "Davits" for Ships' Boats.
We, JAMES SAMPLE and JAMES SAMPLE & COMPANY LIMITED of Custom
House Chambers, Quayside, in the City and County of Newcastle-upon-Tyne,
Shipowners and Patentees, 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 :-
"
This invention relates generally to certain improvements in the construction and
arrangement of parts of swinging or pivotted "davits" and specially to a self acting
safety fitting by which the boat, when being put "outboard" or brought "inboard,'
is protected from the serious accidents which have occurred by the ship rolling or
taking a sudden lurch.
" but
This safety fitting is applicable, and necessary, to all swinging "davits
having special reference to " davits "made according to Patent No. 4222 of
March 3rd, 1892, granted to James Sample, we have on the accompanying drawing
shewn it so applied to a pair of "davits" for one boat and the drawings also shew
certain improvements which have been found desirable since that date in the details
of the arrangement and construction of parts of said "davits."
be
Fig. 1 shews a broadside view of a boat resting in the "bilge chocks" ready to
swung " outboard."
Fig. 2 shews the boat having been lifted out of the "chocks" being swung
"outboard," and
Fig. 3 shews the boat being brought "inboard" and nearly in position for resting
in the "chocks."
" even-keel."
In all these figs. the ship is supposed to be on an
Figs. 4 and 5 specially illustrate, to a larger scale, the application and operation
of the self acting safety fitting in two positions looking forward or on "starboard"
side, Fig. 4 shewing the boat partly swung "outboard" as in Fig. 2, and Fig. 5
shewing it nearly "inboard ' as in Fig. 3.
"
The same letters refer to similar parts on all the figs.
AA are the main stanchions, sloping "inboard," inserted in sockets B B which
are bolted to the deck and further stayed by the back stays C C. The swinging
or pivotted arms F F have their lower ends forming wide double eyes G G, pivotted
by bolts to bearings formed on the sockets B B and upon each arm is fitted a hinged
safety "pawl" P. engaging, when in action, with the teeth of racks R R, formed
upon the sockets B'B. At their upper ends the arms F F are preferably con-
nected by a chain, or rod (as in Fig. 1) and the tackle blocks H H are attached to
their bent ends.
When the swinging arms are fully "inboard" they incline backward, and are
supported in bracket jaws J J cast on the sockets B B. When the swinging arms F F
are fully "outboard " they are checked and held by a chain clear of the bulwark
rail upon which may, in certain cases, be fitted jaws into which the arms FF will
enter and be supported fore and aft wise. The blocks and tackles for raising and
lowering the boat and for swinging the "davits," "inboard" or "outboard," require
10 explanation.
"
Fig. 4 shews to a larger scale the boat (say on
starboard" side) being swung
outboard by the tackles the ship having rolled heavily to "starboard" and
Fig. 5 shews the ship having rolled back to "port." In Fig. 4 the swinging
outboard" proceeds controlled by the tackles, the "pawls" P P, hinged on the
077

page_text: swinging arms F F, passing freely over the teeth of the racks RR, but, in the
position shewn on Fig. 5 these "pawls" have automatically engaged with the teeth
so as to prevent the "davits "swinging violently back "inboard" to the risk of
throwing out the crew of the boat. In Fig. 2 the "pawls " P P rest upon and fall
freely over the teeth of the racks as the arms F. F. swing outward, but when the
boat is being brought "inboard" the pawls will rest against the swinging arms, as
in Fig. 3, till, by the rolling of the ship, the "davits assume the position shewn
on Fig. 5 when the "pawls" will fall by the self action of gravity and momentum,
into gear with the teeth of the racks, and so instantly arrest the swinging backward
of the "davits." When the ship again rolls to "starboard "the "pawls" will be
lifted out of gear and laid back upon the swinging arms, as in dotted lines, on Fig. 4
and also on Fig. 3, when the swinging inboard can proceed till the "pawls" again
fall into gear by the next roll of the ship. The "pawls" PP are fitted near their
points with studs S S by which they are caused to rest at such an angle with the
arms F F as to tend to fall by gravity into gear with the racks before the arms are
vertical (and the projection of these studs may be adjusted to cause the "pawls
to fall by gravity at any desired angle of the arms) and their falling into gear will,
to some extent, be assisted by their own momentum when the ship rolls violently so
as to bring the "davits" suddenly "inboard."
"
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The improvements in swinging "davits" consisting in the fitting thereto of self
acting safety "pawls" hinged to the swinging arms, and in connection with fixed
racks so that 1st. when the boat is being put out said "pawls" will run free but,
by the rolling of the ship, will instantly engage with the teeth of said racks and
prevent the boat being violently swung "inboard" and 2nd. that when the boat is
being brought in the rolling of the ship will cause the "pawls," then temporarily
out of gear with the racks, to automatically fall into and engage with their teeth
and prevent the boat being violently swung "inboard," substantially as described
and in one form of swinging "davits " shewn by the accompanying drawings.
ليم
Dated CHIS 8th day f
vauuai
BARU OULURLY UL auudiY TONA
T. J. DANSON, F. Inst. P.A.,
Chartered Patent Agent,
Newcastle-upon-Tyne, Agent for Applicants.