Blocks for Fishing Smacks and other Vessels.
Year: 1885

page_text: Blocks for Fishing Smacks and other Vessels.
'
We WILLIAM SISSONS of 89 Park Street and PETER PATRICK WHITE of
35 Thomas Street both of Hull in the County of the same town Engineers do
hereby declare the nature of this Invention to be as follows:-
The object of our invention is to arrange the main and mizen sheet blocks of
fishing smacks and other vessels in such a manner as to lessen the wear of such
blocks and the ropes attached thereto, and also to prevent the great noise hitherto
caused by the swinging of the boom.
In order to effect the first part of this invention we arrange the blocks upon the
mizen rail and boom with suitable joints so as to give play to the same, and the
main sheet block is mounted in a chock fixed upon the deck.
'
The joint that we prefer to employ in the case of the mizen block is an ordinary
ball and socket joint adapted and applied to the mizen rail, and the joint we prefer
to use for the boom block consists of a limited traverse rocking joint suitably
applied to the boom, both the aforesaid blocks having a revolving movement upon
a pin in addition to the ordinary revolving movement of the sheaves.
The main sheet block upon deck is mounted in a chock as above mentioned, such
chock being bolted to a beam below and across the deck provided for the purpose.
This main sheet block only being capable of movement round a pin in addition to
the ordinary sheave movement.
By this arrangement of the blocks, the joints give a certain amount of necessary
play and at the same time a steadiness and a distribution of the strain hitherto
felt upon both blocks and ropes when caused to fall about by the vessel's movements
and arranged and applied in the ordinary manner.
In order to prevent the noise hitherto caused by the swaying of the boom we
provide india rubber cushions applied round each end of the centre pins carrying
the blocks and sheaves, such cushions being encased on the outside by suitable
cylindrical plates or boxes to protect them from wear. The cushions are made so
as not to fit very closely round the centre pins aforesaid, thereby allowing the india
rubber to expand and fill up the space in the direction opposite to that of the
strain upon the block and sheaves..
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page_text: шаец оцени
Blocks for Fishing Smacks and other Vessels.
We WILLIAM SISSONS of 89 Park Street and PETER PATRICK WHITE of
35 Thomas Street both of Hull in the County of the same Town Engineers 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:-
•
The object of our Invention is to arrange the main and mizen sheet blocks of
fishing smacks and other vessels in such a manner as to lessen the wear of such
blocks and ropes attached thereto, and also to prevent the great noise hitherto
caused by the swing of the block when the boom comes over.
In order to effect the first part of this Invention, we arrange the blocks upon the
mizen rail and boom with suitable joints such as a ball and socket or swivel or
other suitable kind of joint so as to give play to the same.
The main sheet block on deck is mounted in a wooden chock provided with two
side plates of iron with boxes to hold the india rubber cushions through which
passes the centre pin of the block allowing it to turn over as the boom swings
from side to side.
By this arrangement of the blocks a steadiness and a distribution of the strain
hitherto felt upon both blocks and ropes when caused to fall about by the vessel's
movements is effected.
In order to prevent the noise hitherto caused by the swaying of the boom we
provide india rubber cushions applied round each end of the centre pin carrying
the blocks and sheaves, such cushions being encased on the outside by the suitable
cylindrical plates and boxes to protect them from wear: the cushions are made so
as to fit very closely round the pin aforesaid thereby allowing the india rubber to
expand or fill up the space in the direction opposite to that of the strain on the
block and sheaves.
The blocks on the boom are allowed to revolve round a circular strap of iron
round the boom with a strap connected with the strap of the block having
cylindrical boxes to receive india rubber cushions round the pin as in the main
sheet blocks.
In order that our Invention may be fully understood we will proceed to describe
it more particularly by the aid of the accompanying drawings in which are shown
blocks constructed and arranged in the manner above referred to.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a side view of a mizen block mounted upon the mizen rail. Figures 2
and 3 are side and end views of a block applied to the boom. Figures 4 and 5 are
side and end views of a block mounted in a chock upon deck.
A is the ball and socket joint which is preferably employed in the case of the
mizen block B mounted on the mizen rail C and the joint D (used by preference)

page_text: is shown connected with the boom block E such joint D having, a limited traverse
on the boom F as indicated at F F-Both the blocks B and E have a revolving
movement upon a pin G in addition to the ordinary revolving movement of the
sheaves.
The main sheet block H upon deck is mounted in a suitable chock I such chock
being bolted to the beam J below and across the deck K.
This main sheet block H being only capable of movement round its pin L in
addition to the ordinary movement of the sheaves.
The india rubber cushions provided to lessen the noise above referred to are
shewn in the several figures at M.M.
-
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
First: The arrangement of the main and mizen sheet blocks of fishing smacks
and other vessels so as to lessen the wear of such blocks and the ropes attached
thereto by means of a ball and socket or other suitable joint applied to the mizen
rail and a limited traverse rocking or other suitable joint on the boom'substantially
as herein before described.
And secondly: The adaptation and application of india rubber cushions round
the centre pins carrying the blocks and sheaves in the manner and for the purpose
substantially as herein before described.`
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