IMPROVEMENTS IN OR RELATING TO BOLTS AND NY
Year: 1877

page_text: LETTERS PATENT to Alfred Parry, of Barrow-in-Furness, in the County of
Lancaster, for the Invention of " IMPROVEMENTS IN OR RELATING TO BOLTS
AND NY"
Sealed the 28th February 1878, and dated the 27th September 1877.
c
PROVISIONAL SPECIFICATION left by the said Alfred Parry at the Office
of the Commissioners of Patents on the 27th September 1877.
ALFRED PARRY, of Barrow-in-Furness, in the County of Lancaster.
MENTS IN OR RELATING TO BOLTS AND NUTS."
"
IMPROVE-
In ordinary bolts the nuts are very apt to work loose; all the modes of locking
at present known are either expensive or inefficient. It is to make a cheap locking
bolt and nut that this my Invention is designed.
It consists,-
1st. In forming opposite some or all the angles of an ordinary nut a longitudinal
groove. This is usually done by placing projecting ridges on the mandril forming
the hole in the blank.
2nd. In the bolt end, where it is screwed, I make a tapering groove. When the
bolt is screwed up I bring the groove in the bolt opposite to one of the grooves in
the nut, and then drive a pin or key into the hole made by the two grooves. The
pin can have a head for extraction purposes. Of course the arrangement could be
reversed by placing one groove in the nut, and several on the bolt; and substantially
the same result would follow, but I prefer the first-mentioned plan, as strongest and
cheapest.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alfred Parry in the Great Seal Patent Office on the 27th March
1878.
"
ALFRED PARRY, of Barrow-in-Furness, in the County of Lancaster. IMPROVE-
MENTS IN OR RELATING TO BOLTS AND NUTS."
Figure 1 is a section of punch and block for punching nuts.
Figure 2 is a section through A, B, showing shape of punch.
Figure 3, a front elevation of bolt and nut with pin in position when locked;
Figure 4, plan of same.
In ordinary bolts the nuts are very apt to work loose; all the modes of locking
at present known are either expensive or inefficient. It is to make a cheap locking
bolt and nut that this my Invention is designed.
It consists,-
1st. In forming opposite some or all the angles of an ordinary nut a longitudinal
groove. This is usually done by placing projecting ridges on the mandrill forming
the hole in the blank.
In smaller sizes the best way of doing this is to make the mandrill or punch
forming the hole in the nut blank an equilateral triangle with rounded corners, as
shown in Fig. 2; in large bolts a punch with projecting ribs can be used.
2nd. In forming a groove or grooves of corresponding size longitudinally in the
bolt; the groove in the bolt is either rolled when rolling the iron, or is formed by a
ridge in the swage block or mould in which the bolt is forged.
It is needless to give Drawings of this, as any ironworker or smith would at once
form this groove in any of the numerous ways in which such things are done at the
present time.
:
The nut being screwed up till one of the grooves in the angles comes opposite
to that in the bolt, when the taper pin or key is inserted and driven in, thus locking
the nut.
Having now described my Invention, and the best mode known to me of carrying
it into effect, I wish it to be understood that I do not claim the abstract principle
of securing a nut by a taper pin or key forced into a groove in the bolt or nut;
or both, as this in one form or another has long been known; but that what I
believe to be new and desire to protect under the herein-before in part recited Letters
Patent is,―
I. The bolt and nut, substantially as described, with grooves formed in them
before screwing or tapping, for the purposes described.
II. The mode of constructing lock nuts and bolts by rolling, punching, or forging
a groove or grooves in them for the purposes described.
III. The triangular or ribbed punches and dies, substantially as and for the
purposes described and shown.
In witness whereof, I, the said Alfred Parry, have hereunto set my hand
and seal, this Second day of March, in the year of our Lord One thousand
eight hundred and seventy-eight.
Witness,
E. GARDNER COLTON,
Clerk to W. P. Thompson,
Patent Agent,
6, Lord Street,
Liverpool.
ALFRED PARRY. (LS.)