Improvements relating to the Locking of Nuts on Bolts.
Year: 1891

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by AUGUSTUS GROSS, of 137, Elizabeth Street,
Sydney, in the Colony of New South Wales, Optician.]
Improvements relating to the Locking of Nuts on Bolts.
I, HENRY EDWARD NEWTON of the Office for Patents, 6 Bream's Buildings:
Chancery Lane, in the County of Middlesex, Patent Agent, 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 :-
In carrying this invention into effect, an ordinary bolt may be adapted to the
appliance for locking a nut thereupon. This is done by making a longitudinal
groove or key-way down the threaded part of the bolt. The groove or key-way
should be of sufficient depth to allow the locking appliance or key itself to repose
within it without interfering in any way with the passage of the nut over the
threaded part of the bolt. The end of the groove (which should extend beyond
the thread) is enlarged or scooped out in bulbous form to form a cavity, so as
to allow the bulbous end of the locking appliance or key to repose snugly within it.
But in order that the appliance may be readily understood, reference will be made
to the accompanying sheet of drawings, in which :-
Fig. 1 is an elevation shewing the front of the locknut appliance in position.
Fig. 2 is a plan view of the same, shewing the nut locked.
Fig. 3 is a vertical section of the same, taken on the line 1-2 of Fig. 1, the
locking appliance being shewn in elevation, and the nut locked.
Fig. 4 is a cross section of the device on the line 3-4 of Fig. 3, the locking
appliance being removed.
Figs. 5 are views that shew in detail the locking appliance or key separate from
the bolt.
A is the bolt, and B is the threaded part thereof. C is the nut. D is the locking
appliance or locking key, of which is the enlarged or bulbous head hereinbefore
referred to. A groove or key-way D' (see Fig. 4) made longitudinally along the
threaded part B of the bolt A, the groove extending beyond the threaded
part B.
The end of the groove is enlarged to receive the bulbous head of the locking
appliance or key D, and will prevent the key from being withdrawn longitudinally
from the groove or key-way. The key or locking appliance should be made longer
than the groove or key-way (see Fig. 1), so that the key may be turned over to lock
the nut, as shewn in Figs. 2 and 3. It is important that the groove should be of
such a depth that when the key is laid within it, the upper surface of the key
should just clear the bottom of the thread of the screw on the bolt (see Fig. 3).
When the bolt is fixed in position and the nut screwed home, the workman will
turn over, in any suitable or handy way, the projecting portion of the key, into the
position shewn in Figs. 2 & 3, thus firmly securing the nut.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
from abroad, I declare that what I claim is :-
The device for locking nuts on bolts, consisting of a key formed with an enlarged
or bulbous end in combination with a corresponding longitudinal groove or key-way
formed in the bolt, the key being made of sufficient length to allow it to be turned
over the nut, and thereby secure and retain the nut in position as berein specified.
Dated this 15th day of April 1891
NEWTON & SON,
Agents for the Applicant.