Improvements in Nut-locks.
Year: 1890

page_text: Date of Application, 25th Jan., 1890
Complete Specification Left, 26th Aug., 1890-Accepted, 27th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in Nut-locks.
A communication from JAMES HARRIS, resident of the City of Hamilton, in the
County of Wentworth, Province of Ontario, Dominion of Canada, Machinist.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex
M.I.M.E., do hereby declare the nature of this invention to be as follows :-
The invention relates to a very simple but thoroughly effective device to prevent
nuts from turning on bolts where concussion or jar would be likely to turn and loosen
nuts on ordinary bolts, and while the device is specially adapted to connect the ends of
railway rails with splice bars or fish plates, it is equally applicable on bridges, armour
plates of vessels, and all other constructions where bol's and nuts are used.
The bolt is formed oval at the unscrewed part of its shank the remaining threaded
portion being circular the head may be any ordinary form, square, round, or
otherwise.
The opening in the body or substance through which the bolt passes is formed oval
so that the bolt cannot turn.
There is provided a washer formed with an oval opening through it to correspond to
the oval portion of the bolt, so that it cannot turn when on the bolt. The outer face
of the said washer is formed with a series of slight elevations and depressions similar
to a ratchet wheel the depressions inclining to the next elevation.
The nut is made in the ordinary manner, only its inner face is formed with a series
of elevations and depressions similar to and made to correspondingly fit the ratchet
faced portion of the washer. The opening in the nut is circular and threaded and
screwed on the round end of the bolt until the two surfaces, (the inner ratchet surface
of the nut and outer ratchet surface of the washer), come in close contact and clasp or
lock tightly in such a manner that the nut cannot by any ordinary means work loose ;
only heavy leverage power can unlock the nut.
It will be observed that the bolt may be made square necked (or otherwise) and
which ever way formed, the washer would be made to correspondingly fit it.
In many cases where rivetting is employed in fastening metal plates together, this
improved nut-lock could be employed with great advantage, as when damaged plates
require to be removed and new ones substituted for them the rivets require to be cut
off, entailing slow, arduous work, much valuable time being lost in that operation.
The present nut-lock will prevent this as the nuts while holding as tightly as any
rivet, can be taken off for repairs in much less time than cutting the rivets to
substitute new for old plates.
It will further be observed that in some cases the washer may be dispensed with and
the ratchet face similar to the washer may be formed in the plate around the bolt hole,
the bolt under this arrangement being inserted and the nut screwed on the bolt until
it impinges firmly against the corresponding ratchet face of the plate around the
bolt hole.
201
T
1000

page_text: 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 by my
foreign correspondent, I declare that what I claim is :—
1. The combination with a square, oval necked, or other shaped bolt, of a washer
whose outer surface is serrated or formed with a series of ratchet shaped elevations
and depressions, and a main nut having its inner face formed with corresponding
ratchet faced elevations and depressions, so that when the washer is placed on a bolt,
and the nut screwed on the end until the two ratchet faced surfaces come in contact, a
nut-lock is formed, substantially as and for the purpose specified.
2. In a nut-lock the combination with an oval necked or equivalently formed bolt
such as A and washer such as having its outer surface formned with ratchet shaped
elevations and depressions g and having an oval or other opening e to fit the bolt of
a main nut such as D provided with a circular threaded opening and having its inner
face formed with a series of ratchet shaped elevations and depressions i to correspond
and fit in the similarly constructed ratchet-shaped face of the washer C substantially
as and for the purpose specified and illustrated in the accompanying drawings.
3. In a nut-lock the combination with an oval, square-necked or other irregular
shaped bolt, of ratchet-shaped elevations and depressions formed on the portion of
the plate through which the bolt passes and a main nut having its inner surface
formed with corresponding ratchet-shaped elevations and depressions which when
screwed on the bolt until it impinges forcibly on the ratchet surface of the plate forms
a nut-lock, substantially as and for the purpose specified.
4. The complete nut-lock substantially as described and illustrated in Figs. 1 to 6 of
the accompanying drawings.
5. The complete nut-lock substantially as described and illustrated in Fig. 7 of the
accompanying drawings.
Dated this 25th dow of Ave 1800
W. P. THOMPSON & BOULT,
Agents for the Applicant.