AN IMPROVEMENT IN BOAT LOWERING TACKLE to be as follows:-
Year: 1885

page_text: I, EDWARD JACOB HILL of N° 6 Westminster Chambers, Victoria Street in the
City of Westminster, Engineer do hereby declare the nature of my said invention
for "AN IMPROVEMENT IN BOAT LOWERING TACKLE to be as follows:-
"
My Invention relates to tackle for raising and lowering ships boats in which
automatic detaching gear is used whereby the boat is released when water borne,
and it consists in an improved construction of block provided with an additional
sheave at right angles to the sheaves on the block for the purpose. hereafter
explained.
It has heretofore been proposed to avoid the release of the automatic detaching
gear at one end of the boat only, in consequence of that end being lifted by a wave,
by so connecting the two tackles as to cause the strain to be transferred from the
one to the other, in such way that the strain on the one will instantly take up the
slack of the other and so prevent the release of the detaching gear at that end. To
make the connection of the two tackles, the standing end of the tackle instead of
being made fast to one of the blocks as usual, is rove through an additional block
attached to the davit head and carried thence to the other tackle.
My invention has for its object to avoid the use of this additional block which is
liable to foul the tackle and to provide a block having the necessary additional
sheave, in the proper position for carrying the rope in the desired direction to
transfer the strain from one tackle to the other. This improved block may be used
either as the standing or upper block or as the running or lower block of the tackle
but preferably as the standing block It consists of a block of the usual con-
struction having the proper number of sheaves according to the purchase required
and provided with an additional sheave at right angies to the others pivoted in
ears either forged on the head of the pin on which the other sheaves turn or on the
metal strap of the block, or formed by a U piece clamped by its cross bar between
the strap and the block or otherwise carried, the sheave in any case occupying such
a position that the strain upon it will not tend to cant the block and throw it out
of its proper position relatively to the other part of the tackle.

page_text: An Improvement in Boat-lowering Tackle.
I, EDWARD JACOB HILL of N° 6, Westminster Chambers, Victoria Street, in the
City of Westminster, Engineer, 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 tackle for raising and lowering ships' boats, in which
automatic attaching gear is used, whereby the boat is released when water-borne ;
and it consists in an improved construction of block provided with an additional
sheave at right-angles to the sheaves of the block for the purpose hereafter
explained. It has, heretofore, been proposed to avoid the release of the automatic
detaching gear at one end of the boat only, in consequence of that end being lifted
by a wave, by so connecting the two tackles as to cause the strain to be transferred
from the one to the other in such way that the strain on the one will instantly
take up the slack of the other, and so prevent the release of the detaching gear at
that end. To make the connection of the two tackles, the standing end of each
tackle, instead of being made fast to one of the blocks of that tackle as usual, is
rove through an additional block attached to the davit head and carried thence to
the other tackle, to which it is attached at such a point that the strain on the
standing end will pull the tackle to which it is attached out of the straight line or
position which, but for this, it would otherwise assume. The consequence of this
connection of the standing ends of the two tackles, each with the other tackle, is
that any slackening of the one tackle alone, by the boat being water-borne at that
end, is instantly taken up by the other tackle.
My invention has for its object to avoid the use of this separate additional block,
which is liable to foul the tackle, and to provide the tackles with standing blocks,
having each the necessary additional sheave, in the proper position for carrying the
rope in the desired direction to transfer the strain from one tackle to the other.
This improved block is of the usual coustruction and has the proper number of
sheaves according to the purchase required, and is provided with an additional
sheave at right angles to the others pivoted in ears either forged on the head of
the pin on which the other sheaves turn, or on the metal strap of the block; or
formed by a U piece clamped by its cross-bar between the strap and the block, or
otherwise carried; the sheave, in any case, occupying such a position that the
strain upon it will not tend to cant the block and throw it out of its proper
position relatively to the other part of the tackle.
Reference is to be had to the accompanying drawings forming part of this
specification.
The extra sheave a over which the standing part of the fall passes to the running
block of the other tackle, runs on a pin carried in ears of a Ŭ piece b, which may
be forged solid with the centre pin c of the main sheaves of the standing block as
in figure 1 or pivoted on said pin as in figures 2 and 3, this U piece being,
preferably, free to turn on, or with, the pin e, to accomodate itself laterally to the
direction of the fall. In either case the U piece should be, preferably, inclined
downwards, or free to incline itself in a line with the resultant of the strains
coming upon it.

page_text: Figure 4 shows the U piece b as held in the proper inclined position by its base,
or cross-piece, being passed under the metal strap d of the standing sheave. When
the ears of the U piece are forged solid on the strap & they would occupy the same
position.
d
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I would observe
that I lay no claim to the method herein described of connecting the boats' davit-
tackle when additional and separate blocks are used for the purpose; but I declare
that what I claim is
1. In a boat lowering tackle in which the standing part of each form is
connected to the running block of the other tackle, the combination with each
standing block of an additional sheave permanently mounted on the block itself in
a plane at right angles to the sheaves of the block, substantially as described and
shown in the drawings.
2. The respective modes of affixing the support for the additional sheave to the
block, substantially as described and represented in the respective figures of the
drawings for the purpose specified.