Improvements in or relating to the Construction of Ships' Blocks and the like.
Year: 1889

page_text: Date of Application, 18th Sept., 1889
Complete Specification Left, 18th June, 1890-Accepted, 19th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Construction of Ships' Blocks
and the like.
I, ROBERT BARCLAY URY HENARKY JOHN DUNCAN trading as R. B. Duncan,
Friday Street, Leicester, Shipbuilder, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to ships blocks and the like and embodies improvements
which have for their object increased durability of the blocks over those of ordinary
construction.
It is well known to sailors, block-makers, and sea-going carpenters that in blocks
of ordinary make the pin often works loose and otherwise gets out of order, thereby
causing inconvenience and sometimes loss.
This invention is designed to overcome these defects and to provide an improved
bearing for the pin.
For this purpose I construct the internal strop with a lug, boss, stud, or
equivalent, which may be bored or otherwise adapted to receive and support the
pin.
The lng, boss, stud or equivalent, may be at the end or in any convenient position
on the strop and preferably of the same thickness as the block shell, it may also
be formed integrally with or attached to the strop by suitable means.
Dated this 18th day of September 1889.
W. P. THOMPSON & BOULI,
Agents for the. Applicant.
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to the Construction of Ships' Blocks
and the like.
I, ROBERT BARCLAY URY HENARKY JOHN DUNCAN trading as R. B. Duncan,
Friday Street, Leicester, Shipbuilder, 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 :-
This invention has reference to ships' blocks and the like and embodies improvements
which have for their object increased durability of the blocks over those of ordinary
construction.
It is well known to sailors, blockmakers, and seagoing carpenters, that in blocks
of ordinary make the pin often works loose and otherwise gets out of order thereby
causing inconvenience and sometimes loss.
This invention is designed to overcome these defects and to provide an improved
bearing for the pin.
For this purpose I construct the internal strop with a lug, boss, stud or equivalent,
which may be bored or otherwise adapted to receive and support the pin.
The lug, boss, stud, or equivalent may be at the end or in any convenient position
on the strop and preferably of the same thickness as the block shell, it may also
be formed integrally with or attached to the strop by suitable means.
In order to assist to a clear understanding of the invention reference is made to
the accompanying drawing in which Figure 1 is a vertical central cross section of
a ships' block constructed according to my invention (minus the pulley wheel) and
Figure 2 is a perspective view with the near side or cheek removed for the sake of
clearness.
Figure 3 is a view illustrating a modification of the boss.

page_text: A. A are the sides or cheeks of the block which are generally of wood and secured.
together by bolts or pins A¹ passing through both sides and through the end pieces A³
thereby forming the shell or framework.
The metal internal strop B is-mortised into the sides A so as to come flush with
the inside face thereof, and is provided preferably at its lower end with a boss C.
The combined thicknesses of the strop B and the boss are equivalent to the
thickness of the sides of the block, and the boss C may be. formed integrally with
the internal strop as shown in Figures 1 and 2 or separately as indicated in
Figure 3.
The boss in the last named Figure being conical-shaped on the exterior is driven
into the inner face of the shell to give increased stability.
The pin or bolt D passing through the block has one end formed of a square section
and. bevelled head D₁ and the other end of a circular section D the boss on each
side of the block being formed with correspondingly shaped holes, this method of
fixing the pin in the bosses, further reduces the tendency of the pin to work loose.
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. In a ship's block or the like constructing the internal strop B with, a lug or
boss such as substantially as and, for the purpose described and illustrated in the
accompanying drawing.
2. The combination in a ship's. block or the like of an internal strop, provided
with a lug or boss such as C or equivalent substantially as and for, the purpose described
and illustrated in the accompanying drawing.
3. In a ship's block or the like the combination with the sides or cheeks thereof
of a metal boss such as C substantially as and for the purpose described and
illustrated in Figure 3 of the accompanying drawing.
4. The improved ship's block substantially as and for the purpose described and
illustrated in the accompanying drawing.
Dated this 17th day of June 1890.