Improvement in the Martin Selfcanting Anchor.
Year: 1893

page_text: Date of Application, 1st May, 1893
Complete Specification Left, 31st Jan., 1894-Accepted. 7th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvement in the Martin Selfcanting Anchor.
CHARLES WILLIAM MATTHEWS, Shipbuilder 3 Talma Road Brixton London
do hereby declare the nature of this invention to be as follows:-
My invention relates to anchors of the class known as the Martin selfcanting
anchors, and it consists of valuable improvements in the construction and manufacture
by doing away with pins, cotters, plates and boxheads, subject to strain and liable
to be broken when in use. My invention enables anchors of this description to be
made with increased strength and durability and can be used with or without stock
to meet the present market requirements.
They also possess increased facilities for stowing and no part of the cable can foul
the anchor they are simple of construction and will be cast in steel by well known
makers so popular at the present time, thus enabling me to supply the market with
a neater stronger and cheaper anchor than hitherto. In an anchor made with my
improvements the shank head will be solid, no open spaces of any description to
allow of sand or rubble to congregate.
It will consist of a circular movement with a stop cast on the boss of arms aud.
will be well arched or curved so as to increase its strength, and will work in a slot
or groove in the centre of hole of shank head on either innerside of shank head
outwardly or at sides which I may deem it necessary to adopt. The stop on arms
will be allowed to pass to centre of hole of shank head by cutting a cross slot from
one side of shank to centre of hole the exact size of stop on arms and will be held
in position by a lock key securely held by a bolt drilled and threaded.
Dated this 1st day of May 1893.
CHARLES WILLIAM MATTHEWS.
CHARLES WILLIAM MATTHEWS.
COMPLETE SPECIFICATION.
Improvement in the Martin Selfcanting Anchor.
I CHARLES WILLIAM MATTHEWS late of No. 3 Talma Road Brixton in the
County of London now of 31 Chantry Road Stockwell also in the said County of
London 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 :-
My said invention relates to anchors in which the arms turn in the head of the
shank such for example as those known as Martin anchors, and the object of my
invention is to improve the form and construction of such anchors and to increase
their efficiency whereby they possess greater strength, durability and holding power
and whereby they can be more easily and cheaply made.
In order that my invention may be fully understood. I now proceed more
particularly to describe the same and for that purpose I shall refer to the several
figures in the annexed sheet of drawings the same letters of reference indicating
corresponding parts in all the figures.
Figures 1 and 2 are elevation and plan of the complete anchor shewing the slot
or groove in the shank head for receiving the solid key or stop on the arms.
Figure 3 is a plan of the arms shewing the solid key or stop D which will work
in the slot or groove in the shank head Č.

page_text: Figure 4 is a sectional elevation of arms.
Figure 6 is a plan of the key plate for locking and securing the arms in their
position.
Figure 7 is a section of the key plate.
Figure 5 is a plan of the stock or steadying arms.
In an anchor made with my improvements as shewn in E and D on the drawings the
arms A turn in an opening or round eye B formed in the head of the shank C and
its movement to either side is permanently and effectually regulated to the right
angle by means of a solid key or stop D formed at the central axis of the arms and
working in a slot or groove E in the head of the shank C, the said slot or groove
extending to the centre of the eye of shank head C. I shall make the key or stop
of the maximum size practicable and equal to three times the strength of the
shearing strain of the pin of the cable shackle so as to give the greatest power of
resistance proportionate to the thickness of the shank head whereby its resisting.
surface is increased and the liability to the deflection of the arms beyond the
proper angle is avoided. The arms are locked and secured in their position by:
means of the key plate F on one side of the shank head. The key plate in turn
being held and secured in its position by the bolt of the buoying shackle. The
arms so secured cannot be displaced in any possible manner. I make the shank
head of the maximum size practicable proportionate to the size of the arms in order
that the slot or groove therein shall be sufficiently deep and wide to give the
greatest amount of resisting surface to the solid key or stop on the arms. By
constructing the solid key or stop of the maximum size practicable and the slot or
groove in the shank head also of the maximum size practicable as hereinbefore
described, I am able to make the anchor with all parts interchangeable and of
extraordinary holding power and strength. I make the stock or steadying arms of
any suitable form that will avoid the fouling of the cable, and I make the
remaining parts of the anchor in any suitable way usual in anchors of this type or.
class.
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
1st. In anchors of the type or class referred to constructing the shank of the
anchor with the key plate and the key way and the slot or groove in the shank
head, the arnis with the solid key or stop all substantially in the manner and form
and for the purposes described and illustrated in the accompanying drawings.
2ndly. The general construction, arrangement and combination of parts con-
stituting an anchor substantially in the manner and form described and illustrated.
in the accompanying drawings.
Dated this 31st day of January 1894.
CHARLES: WILLIAM MATTHEWS.