▲ New OR IMPROVED MOORING OR PERMANENT ANCHOR
Year: 1883

page_text: LETTERS PATENT to Edward Croft Greenway Thomas of No. 11 Nerland
Square Notting Hill in the county of Middlesex for an Invention of “▲ New
OR IMPROVED MOORING OR PERMANENT ANCHOR" 10-
PROVISIONAL SPECIFICATION left by the said Edward Croft Greenway
Thomas at the Office of the Commissioners of Patents on the 23rd April
1883.
'
EDWARD CROFT GREENWAY THOMAS of N°. 11 Norland Square Notting Hill in
the county of Middlesex 'A NEW OR IMPROVED MOORING OR PERMANENT
ANCHOR
"
"
!
In constructing a mooring according to my invention, I employ a heavy block
which may be termed a sinker block having a hole through its centre. A bar is
passed through the hole, free to slide vertically therein, but prevented by an
enlarged end from being drawn through it. To the upper end of the bar the cable
or mooring chain is attached.
On the underside of the sinker block, and closely adjoining the hole, I hinge
strongly to the block two pendent fins, which, when closed form an envelope to
that part of the bar which projects below the block, and presents externally a
shape somewhat like that of a sugar-loaf with its point downwards. At each angle
of the sinker block I provide projecting legs in the form of cones with their points
downwards.
When the sinker block is sunk, its weight, mechanically assisted if necessary,
causes it to be embedded deeply in the bottom. When a strain is applied tending
to raise the bar and the block, the enlarged head of the bar, rising between the
hinged fins, causes them to expand, and these act conjointly with the weight of
the block and the hold of its legs to prevent withdrawal of the mooring or
permanent anchor.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Edward Croft Greenway Thomas in the Great Seal Patent
Office on the 20th October 1883.
EDWARD CROFT GREENWAY THOMAS of N° 11 Norland Square Notting Hill in
the County of Middlesex "A NEW OR IMPROVED MOORING OR PERMANENT
ANCHOR
In constructing a mooring according to my invention, I employ a heavy block,
which may be termed a sinker block having a hole through its centre. A bar is
passed through the hole, free to slide vertically therein, but prevented by an
enlarged end from being drawn through it. To the upper end of the bar the cable
or mooring chain is attached.
On the underside of the sinker block, and closely adjoining the hole, I hinge
strongly to the block two pendent fins, which, when closed, form an envelope to
that part of the bar which projects below the block, and presents externally a
shape somewhat like that of a sugar-loaf with its point downwards. At each
angle of the sinker block I provide projecting legs in the form of cones with their
points downwards
When the sinker-block is sunk, its weight, mechanically assisted if necessary,
causes it to be embedded deeply in the bottom. When a strain is applied tending
to raise the bar and the block, the enlarged head of the bar, rising between the
hinged fins, causes them to expand, and these act conjointly with the weight of the
block and the hold of its legs to prevent withdrawal of the mooring or permanent
anchor.
Fig. 1 of the accompanying drawings is a vertical section and Fig. 2 is a side
view of a mooring according to my invention as it would appear when first sunk
in the sand or mud at the bottom of the anchorage, Fig. 3 is a section shewing its
fins expanded by tension of the mooring chain. It consists of a heavy block A
(which may form a box to receive weights for sinking it) having legs B, and two
pendent fins C hinged to the underside of the block A. Through a hole in the
middle of the block passes freely a bar D, which terminates at the bottom with a
pear shaped end d enclosed between the two fins C, and which has the mooring
chain E attached to it at the top by a shackle F. When by tension of the mooring
chain the bar D is drawn upwards, its pear shaped end, sliding along the inclined
inner faces of the fins C, causes them to expand as shewn in Fig. 3, so that they
act as barbs to prevent the withdrawal of the mooring from the bottom of the
anchorage. I prefer to make the legs B with several cups G on them, and the
fins C may also have external cups H, so as to give a better hold of the ground.
Having thus described the nature of my invention and in what manner the
same is to be performed, I claim :-
The construction and use of a mooring or permanent anchor arranged and
operating substantially as herein described.
In Witness whereof I the said Edward Croft Greenway Thomas have hereunto
set my hand and seal this Nineteenth day of October in the year of our Lord One
thousand eight hundred and eighty-three.