Improved Connections between Booms or Derricks and Masts of Ships.
Year: 1890

page_text: Date of Application, 11th Nov., 1890
Complete Specification Left, 11th Aug., 1891-Accepted. 10th Oct
1801
PROVISIONAL SPECIFICATION.
Improved Connections between Booms or Derricks and Masts
of Ships.
I WILLIAM BATHIE COWAN 19 Horatio Street Monkwearmouth Sunderland
County of Durham Blacksmith do hereby declare the nature of this invention to
be as follows:
-
The object is to provide stronger and better connections between booms or
derricks and masts of ships. As at present constructed the sockets on booms and
derricks are made with two cheeks which only go partly round spars.
The improvements which I intend are that a bell shaped socket with single eye
be fitted on end of boom or derrick. A hollow shaft with double eye to receive
single eye of boom or derrick socket connected by through bolt.
The connection for shaft is by through bolt secured in shoes top and bottom, the
shoes can be riveted, bolted, or connected by hoops to masts.
Bottom shoe to have single eye to receive leading block shackle or hook.
Dated this 10th day of November 1890.
WILLIAM BATHIE COWAN.
COMPLETE SPECIFICATION.
Improved Connections between Booms or Derricks and Masts
of Ships.
I WILLIAM BATHIE COWAN 19 Horatio Street Monkwearmouth Sunderland
County of Durham Blacksmith 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 is to provide stronger and better connections between booms or
derricks and masts of ships. As at present constructed the sockets on booms and
derricks are made with two cheeks which only go partly round spars.
The improvements which I intend are that a bell shaped socket with single eye
be fitted on end of boom or derrick. To secure boom or derrick end in socket,
there is a ring bolt passing thro' vertically, the eye being on underside to take
outhaul tackle for sail. A hollow shaft with double eye to receive single eye of
boom or derrick socket connected by bolt. The connection for shaft is by thro'
bolt, secured in shoes top and bottom. These shoes can be riveted, bolted, or
connected by hoops to masts.
I sometimes arrange for a plate with the shoes on, being in one piece. The
bottom shoe in both cases is constructed with large eye on bottom part to take
leading block shackle or hook. A tap bolt is also let into bottom shoe so as to
bear on thro' bolt to keep it secure when in position.
To show clearly the nature and use of my invention refer to drawings enclosed,
all these drawings are to a scale of one inch
= one foot.
Figure 1 is a side view of my improved fittings in position and working order,
X represents boom or derrick. A socket which encloses boom or derrick end.
B shews ring-bolt which not only serves, as a fastening for boom or derrick end in
socket, but the eye being on underside, is utilised for the working of trysail outhaul
ackle. Crepresents the construction of double eye. D shews large bolt through
shoes and double eye. E and E shews construction of top and bottom shoes
espectively, these are the style of shoes which are used in all cases where ordinary
argues are intended to be worked, these shoes are either riveted, or bolted, to iron
[Price 6d1

page_text: mast Z. As shewn on plan a large eye is formed on bottom shoe E to take hook
or shackle of leading block.
F is a small bolt through shoe E2 and with end let into large bolt D to keep it
from lifting out when in position. G is connecting bolt for socket A and double
eye C.
Figure 2 is a section looking in a fore and aft direction, shewing fastening of
shoes to mast.
Figure 3 represents a plan view through dotted line J. K. with boom lowered to
the same level, the reference letters in this sketch and Figure 2 all correspond with
those in Figure 1.
Figures 4 and 5 shew another method of fitting the shoes, instead of those
marked E and E2 in Figures 1, 2, 3. In this case they form part of a large
plate E by this arrangement the shoes are made larger with an increase in the
number of rivets or bolts, this style being adopted when the booms or derricks are
intended for the lifting of heavy weights.
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.
First. A bell shaped socket to encircle boom or derrick end, instead of socket
with two checks.
Second. A hollow shaft with double eye attached between shoes, the general
method being to have the double eye above top hoop.
Third. Shoes top and bottom, the bottom shoe to have large eye on under part,
to take leading block shackle or hook.
Dated this 10th day of August 1891.
WILLIAM BATHIE COWAN.