AN IMPROVED BOLT AND NUT FOR RAILWAY PURPOSES
Year: 1884

page_text: "
I WILLIAM CORTEEN of 41, North Church Street Sheffield in the County of
York Carriage Maker do hereby declare the nature of my invention for AN
IMPROVED BOLT AND NUT FOR RAILWAY PURPOSES" to be as follows
The object of my Invention is to provide a Bolt and Nut, in which the Nut shall
hold tight at the exact spot of travel desired, or distance between the inside of the
Nut and the inside of the Bolt head.
To effect this, the hole and thread in the Nut nearest the Bolt head, run parallel
about half way through the Nut, and the hole and thread then slightly expand to
the outer face, and each flat part of the nut is punched near the outer face with
keyholes, made wider nearest the face of the Nut, and tapered towards the centre
of same.
The Bolt is screwed with a thread to suit the first or parallel part of the Nut-
In the outer end of the Bolt, a slot is cut so as to widen the Bolt at that part, to
such extent as may be necessary to obtain the grip required, so that the inner end,
or top of the slot, will be about half way in the Nut-The Nut, being screwed up
as far as the substance to be gripped will permit, I then drive a tapered Chisel into
the slotted part of the Bolt, thereby expanding same, and I then knock a double
pin or bevelled edge Keeper through the Nut and Bolt.
The Pin or keeper, after being driven through as stated, is then expanded by
means of a Chisel and turned off at the ends, thereby keeping the Pin tight in its
position, and then by the grip which the Bolt gives it, on the Chisel being knocked
away, the Pin is kept from working out.
At the same time the Pin keeps the Nut from moving, and each flap of the Bolt
expanding to suit the thread, in the expanded Nut makes a reliable lock from three
points, namely, from the Nut, the Bolt, and the Pin.
:
These Bolts may be made of suitable steel, or in some cases of iron, case hardened
in part, as where friction brings weight to bear, but should be let down at the
alotted nart of the Bolt

page_text: The accompanying Drawings illustrate the application of my Invention.
Figure 2 shews the Nut and Bolt when locked, Figure 1 being a sectional view
of the same, and Figures 3 and 4 illustrate the like when not in tension or
operation.
Like letters of reference, where such letters appear, indicate corresponding parts
in the Drawings.
Letter A, shews the square of the Bolt, letter B the part of the screw which runs
parallel in the Nut, letter O the part of the Bolt which is slotted, and letter D shows
the Pin or Keeper.
By the above means a durable Bolt and Nut of simplo construction is provided, 1
avoiding any effects from vibration, and at the same time the Bolt and Nut are
such as can be easily removed and replaced without injury to the.threads.

page_text: COMPLETE SPECIFICATION.
i
I WILLIAM CORTEEN of 41, North Church Street Sheffield in the County of
York Carriage Maker do hereby declare the nature of my invention for "AN
IMPROVED BOLT AND NUT FOR RAILWAY PURPOSES" and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
The object of my Invention, is to provide a Bolt and Nut in which the Nut shall
hold tight at the exact spot of travel desired, or distance between the inside of the
Nut and the inside of the Bolt head.
To effect this, the hole and thread in the Nut nearest the Bolt head run parallel.
about half way through the Nut, and the hole and thread then slightly expand to
the outer face, and each flat part of the Nut is punched near the outer face with
key holes made wider nearest the face of the Nut, and tapered towards the centre
of same.
The Bolt is screwed with a thread to suit the first or parallel part of the Nut-
In the outer end of the Bolt a slot is cut so as to widen the Bolt at that part to
such extent as may be necessary to obtain the grip required, so that the inner end
or top of the slot will be about half way in the Nut. The Nut being, screwed up
as far as the substance to be gripped will permit, I then drive a tapered chisel into
the slotted part of the Bolt thereby expanding same, and I then knock a double
pin or bevelled edge keeper through the Nut and Bolt.
The pin or keeper, after being driven through as stated, is then expanded by
means of a chisel and turned off at the ends, thereby keeping the pin tight in its
position, and then, by the grip which the Bolt gives it on the chisel being knocked
away, the pin is kept from working out.
At the same time the pin keeps the Nut from moving, and each flap of the Bolt
expanding to suit the thread in the expanded Nut, makes a reliable lock from three
points namely: from the Nut, the Bolt, and the Pin.
These Bolts may be made of suitable steel, or in some cases of iron case hardened
in part, as where friction brings weight to bear, but should be let down at the
alotted part of the Bolt.
The Drawings accompanying my provisional Specification illustrate the application
of my Invention.
Figure 2 shews the Nut and Bolt when locked, Figure. 1. being a sectional view
of the same, and Figures 3 and 4 illustrate the like when not in tension or
operation.
Like letters of reference, where such letters appear, indicate corresponding parts
in the Drawings.
Letter A shews the square of the Bolt-Letter B the part of the screw, which
runs parallel in the Nut-Letter C the part of the Bolt which is slotted, and
letter D shews the pin or keeper.
By the above means, a durable Bolt and Nut of simple construction is provided
avoiding any effects from vibration, and at the same time the Bolt and Nut are
such as can be easily removed, and replaced without injury to the threads,

page_text: Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
First. The above described form of thread, increasing in circle in the Nut to the
exterior part.
Second. The outward alot and holes suitably shaped, so as to admit the Pin
through the split Bolt, when the Nut is firmly screwed up, and chisel driven into
the end of the slot.
Third. The above described form and description of Bolt and Nut, and application
of the various parts as described, whereby, vibration or any effect from same is
avoided, and which may be removed and replaced, without lessening the application
of the grip.
KONT
Dated this thirtieth day of: January One thousand eight hundred and eighty