Improvements in Anchors.
Year: 1893

page_text: Date of Application 7th Mar., 1893
Complete Specification Left, 7th Dec., 1893-Accepted, 3rd Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Anchors.
I, GEORGE TYZACK, of Cooksons Quay, South Shields, in the County of
Durham, Engineer and Admiralty Contractor, do hereby declare the nature of this
invention to be as follows:-
"
My invention has special reference to triple grip anchors in which the crown
piece and the "sector-toggle" forming the "Trotman cross with hollow backed
palms "trip" (as described in my Patent No. 178787) are formed in one piece of cast
steel and the method of attaching the shank thereto. Hitherto these triple grip
anchors, when made of cast steel, have had an open trough along the back of the
crown piece up to the connection with the shank for the insertion of the connecting
bolt which makes the pattern more costly and the moulding more difficult and to
obviate these objections I propose to adopt the following improvements in
construction:-
1st. Forming the crown-piece with square shoulders where it turns back to form
the palms so as to admit of a hole being cast right through from shoulder to
shoulder for the connecting bolt.
2nd. Passing the connecting bolt through the crown piece and through the eye
of the shank when inserted in the cavity formed in the crown piece and upon the
ends of said connecting bolt and if desirable to provide "balls" projecting beyond
the shoulders to steady and prevent the anchor rolling when taking hold like a
"stock."
3rd. Forming the front of the crown piece of hollow sided ✓ shape tending to
make the anchor bury its head in the ground.
Dated this 7th day of March 1893.
T. J. DANSON,
By L. W., per F. B.
Improvements in Anchors.
I, GEORGE TYZACK, of Cooksons Quay, South Shields, in the County of
Durham, Engineer and Admiralty Contractor, 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 invention has special reference to "triple-grip" anchors in which the:"crown
piece" and the "sector-toggle," forming the "Trotman cross "with hollow backed
palms "trip," (as described in my Patent No. 178787) are formed in one piece of
cast steel and to the method of attaching the shank thereto. Hitherto these
triple-grip" anchors, when made of cast steel, have had an open trough along
the back of the "crown-piece" up to the connection with the shank for the
insertion of the connecting bolt which makes the pattern more costly and the
moulding more difficult, and to obviate these objections 1 propose to adopt
the following improvements in construction :-
1st. Forming the "crown-piece" with square shoulders where it turns back to
form the "palms" so as to admit of a hole being cast right through from shoulder
to shoulder for the connecting bolt.

page_text: DESCRIPTION OF DRAWINGS.
"
On the accompanying sheet of drawings an anchor is shewn made according to
my invention the "crown-piece" and the "tripping arms (forming a "Trotman-
cross") being cast in one piece and being connected to the shank by a bolt which
traverses the whole breadth of the "crown-piece" and has upon its ends, projecting
beyond the square shoulders, balls which act precisely in the manner of a stock
upon the shank to prevent the anchor rolling when taking hold.
"
66
Fig. 1 is a plan and Fig. 2 a side view of the anchor, the latter shewing it when
embedded in the ground which it grips, not only with the main "palms" P, and
the shaped front of the "crown-piece," but with one of the hollow backed
palms P¹ of the tripping "sector-toggle T, see Fig. 2. The shank S is connected
to the "crown-piece" C by the bolt B, which passes through a hole, cast through
the "crown-piece" from shoulder to shoulder, and through the eye of the shank,
which bolt has upon each end, projecting beyond the square shoulders, a rounded
knob or ball K and acts precisely in the manner of the "stock" on the shank in
the old form of anchors.
Fig. 3 is a back view of the "crown-piece" C, and
Fig. 4 is a front view of same, intended to shew the shape of the "crown-piece" C
in relation to the "sector-toggle "T, the main "palms " P and auxiliary “palms” P¹,
and the cavity to receive the eye of the shank S.
Fig. 5 is a section through a-b on Fig. 1 to shew the V form of the front of the
"crown-piece" and Fig. 6 a section shewing the shape of the "palms " P through
c-d Fig. 1.
The anchor is shewn accurately to scale at 15th full size for a 40 cwt. anchor
of the proportions 1 have adopted in practice and which I prefer, the points of the
main palms" P from the centre of the "crown-piece" being about one half the
length of the shank S from eye to shackle.
This type of "triple-grip" anchor presents no difficulty in pattern making, in
moulding, nor in casting the "crown-piece" and "tripping sector-toggle" in one,
and the square shoulders with the knobs or balls on the ends of the connecting bolt
forming a "stock" through the "crown-piece" has been recognised by the highest
authorities as a great improvement for vessels classed under Figure 1 in Lloyd's
Register. An anchor of the type shewn becomes practically a "stocked-anchor,"
with greatly increased holding power.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1st. The improvements in "triple-grip" anchors consisting in casting the
"crown-piece" and "tripping sector-toggle," acting on the principle of a
"Trot-
man cross "with hollow backed "palms," in one piece with a cavity to receive the
eye of the shank and in which a "crown-stock" bolt passes through a hole in the
"crown-piece" from shoulder to shoulder through the eye of the shank, projecting
beyond the shoulders and preferably with round balls fitted on each end, the whole
constructed and operating substantially as described, with the objects hereinbefore
stated.
2nd. The "triple-grip" anchor comprising in combination, a "crown-piece" C
having cast solid upon it a "tripping sector-toggle" T with hollow backed

page_text: "palms" PI, acting on the principle of a "Trotman-cross," a shank S inserted in a
cavity in the front of the "crown-piece" and connected thereto by a "crown-
stock" bolt B passing through the "crown-piece" from shoulder to shoulder and
having projecting ends fitted with round balls K, the whole constructed as
5 described and shewn by the accompanying drawings.
Dated this 7th day of December 1893
T. J. DANSON, F. Inst. P. Agents,
Chartered Patent Agent, Agent for Applicant.