Improvements in Boats' Davits.
Year: 1891

page_text: Date of Application, 14th Apr., 1891
Complete Specification Left, 28th July, 1891-Accepted, 29th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Boats' Davits.
I, HENRY EDWARD BOWRING, of Mole Bank, East Molesey. in the County
of Surrey, Gentleman, do hereby declare the nature of this invention to be as
follows
-
My invention relates to improvements in boats' davits.
In carrying it into effect, the davit is pivotted upon a block adapted to turn
with the davit about its axis; and behind the davit stands a post from which a
pair of quadrants project in the direction of the side rail, one on each side of the
davits as to act as a guide for the latter. A line is led from the past round a
pulley on the back of the davit and through a block pivotted at the foot of the
pillar. This line is for controlling the motion of the davit. A suitable cleat for it
is provided on the post.
The post, foot block of the davit, and the block at the foot of the post are
preferably all mounted upon a single base plate.
For holding the davit securely home I pivot a screwed rod upon the back of it
upon which a wing nut or T works. A slot is formed in the top of the post in
which the rod engages.
provide a second screwed rod and wing nut or T. The rod is fast to the
davit, projects through a slot in one quadrant, and engages in a parallel slot in the
opposite quadrant. By screwing up the T, the davit can be fixed in any position
between its two terminal positions.
Both the above mentioned rods are fixed to a collar upon the davit.
A block and tackle made fast behind the davit and connected to the latter near
its top may be provided to further control the motion of the davit or to supplement
the tackle above mentioned.
Dated this 13th day of April 1891.
PHILLIPS & LEIGH,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Boats' Davits.
1, HENRY EDWARD BOWRING, of Mole Bank, East Molesey, in the County
of Surrey, 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 :-
My invention relates to improvements in boats' davits.
In carrying it into effect, the davit is pivotted upon a block adapted to turn
with it about its axis, and behind the davit stands a post from which a pair of
quadrants projects in the direction of the side rail, one on each side of the davit,
so as to act as a guide for the latter. A line is led from the post round a pulley
on the back of the davit, and through a block pivotted at the foot of the pillar.
This line is for controlling the motion of the davit. A suitable cleat for it is
provided on the post.
The post, foot-block of the davit, and the block at the foot of the post are,
preferably, all mounted upon a single base plate.
For holding the davit securely home, I pivot a screwed rod upon the back of it
upon which a wing nut or T work. A lot is formed in the top of the post in
which the rod engages.

page_text: provide a second screwed rod and wing nut or [. The rod is fast to the davit,
projects through a slot in one quadrant, and engages in a parallel slot in the
opposite quadrant. By screwing up the T, the davit can be fixed in any position
between its two terminal positions.
Both the above mentioned rods are fixed to a collar upon the davit.
A block and tackle made fast behind the davit and connected to the latter near
its top, may be provided to further control the motion of the davit, or to supplement
the tackle above mentioned.
In order that my invention, and the means by which it is to be carried into
practical effect, may be thoroughly understood, I will now describe them in detail,
referring, in so doing, to the accompanying figures which are to be taken as part of
this Specification and read therewith.
Fig. 1 is a rear elevation of one davit in its vertical position, or position of rest.
The second or supplementary block and tackle is omitted.
Fig. 2 is a side elevation corresponding with Fig. 1, but including the said
second or supplementary block and tackle. The dotted lines on the left hand of
this figure shew the relative position of the several parts when the davit is swung
down either to lower a boat or to take it aboard again.
Fig. 3 is a plan showing a davit turned about its vertical axis through an angle
of 45°. The dotted lines shew it as standing with its nose inwards.
The several parts are marked throughout the figures in which they respectively
appear, with the same reference letters.
Its bottom
a is the davit; a', its curved and overhanging top; and a² its cyc.
end, or foot, is pivotted in the foot-block 6. The axis upon which the davit
swings when it is either raised or lowered is at right angles with the plane in which
the davit swings. The foot-block is in its turn pivotted in the base plate c upon
which it can turn with the davit, but only about the vertical axis common to both
davit and foot-block.
The dotted lines in the top right hand corner of Fig. 2, and on the right hand
of Fig. 3, show the davit as turned about its vertical axis till the curved top a
stands inwards over the deck.
The base plate is made fast to the deck d by any suitable and well known
device.
e is a post standing immediately behind the davit a and its foot block b, and is,
preferably, fast to the same base plate c.
ff are a pair of ares constituting a guide for the davit. Their rear ends are
made fast to the post e near its top, one on each side of the davit. Their front
ends are united as shown in Fig. 3, thereby providing a seat or stop. adapted to
receive, and limit the downward swing of, the davit a, as illustrated by the dotted
lines on the left hand of Fig. 2.
is the ordinary side railing. is a bracket projecting from the top rail
thereof in the direction of the davit. The front ends of the arcs f, ie, the
stop g, is made fast to the bracket . i, i are a pair of struts from the respective
arcs to the base plate c; and, with the bracket h³, are provided for the purpose of
imparting rigidity to the davit-guide.
In consequence of the relative positions of the axis of the davit and the plane
in which the latter swings between the ares f,, the said davit can only be swung
in either direction between the said ares when the curved top of the davit is in
the vertical plane through which the davit swings, so that the vertical position of
the davit whenever it is being turned about its vertical axis, is always assured.
is a pulley standing in the vertical plane and having its bearings in a pair of
cheeks, which project from the rear side of a collar / through which the davit a
passes.
m is a second pulley in the same vertical plane as the pulley j. It has its
bearings in rearward extensions of the arcs ff. is a third pulley.
The frame in which it has its bearings is pivotted upon the base plate e for the
purpose of allowing it to move about the vertical axis n of the frame a' according
to the direction in which the portion of the line o outside the pulley a is pulled. This

page_text: and n.
line is made fast to the post as at p. led through the port m', round the pulleys j, m
As each davit with its addenda is a counterpart of its fellow, there are
two lines o. These lines are provided for the purpose of steadying the downward
swing of the davits during the operation of lowering the boat, by hauling on those
portions of them outside the pulley n, as well as for pulling the davits back into the
vertical position during the operation of raising the boat. is a cleat for fastening
the loose end of each line o to the post e. If preferred, both lines may be united
at a suitable point outside the pulleys n so that from that point there would be only
one hauling line.
r is a second line, one to each davit, made fast to a loose ring or collars about
the top of the vertical portion of the davit. t is a collar fast upon the davit, and
provides a seat upon which the collars is carried.
» is a pulley having its axis in
a frame r which can turn about its vertical axis upon the deck some short distance
to the rear of the davit.
The function of this second liner and pulleys is to assist and supplement the
lines o.
A special device, independent of the lines o and and their addenda, is provided
to hold the davit in a vertical position. It consists of a screwed rod o pivotted to
the collar to' is a slut in the top of the post e, into which the rod to can be
dropped when the davit is vertical. is a screwed nut engaging with the thread
on the rod c, and is provided to bear against the rear face of the post e when the
rode is in the slot and up to which face it can be tightly screwed.
The figures show the arcs f, f, as extending from the pillar e only to the side
rail, or through an angle of about 45°. I do not confine myself in this respect,
inasmuch as they may be continued down to the deck, i.e., through an angle
of 90°.
A special device independent of either of the lines o and is provided for the
purpose of holding the davits at any desired point of their travel up or down the
guide. is an arc-shaped slot cut in each arc f. is a screw bolt passing
through both slots of the pair of arcs ff, and also through a hole in an extension
of the collar 7. is the nut of the bolt. This bears upon one sile of the guide,
while the head of the bolt bears upon the opposite side, so that when the nut is
screwed up the davit will be held in whatever position it occupies at the time.
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,
1. The combination of arc-shaped davit-guide, pivotted foot-block, davit pivotted
to foot-block and line and pulley tackle, as set forth.
2. The combination of arc-shaped davit-guide, pivotted foot-block, davit pivotted
to foot-block, line and pulley tackle, and supplementary line and pulley tackle, as
set forth.
3. The combination of arc-shaped davit-guide pivotted at its foot, fixed post
behind it, and nut-and-screw devices, as set forth.
4. The combination of foot-block adapted to turn about its vertical axis, fixed
are-shaped guide and davit pivotted in the said vertical block and capable of
motion in the guide only when the darit-top and the guide are in the same plane,
as set forth.
Dated this 28th day of July 1891.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.