An Improvement in Locks for Screw Nuts.
Year: 1898

page_text: Date of Application, 29th Nov., 1898
Complete Specification Left, 13th Mar., 1899-Accepted, 15th Apr., 1899
PROVISIONAL SPECIFICATION.
An Improvement in Locks for Screw Nuts.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention (as communicated to me from abroad by William H. Carruthers, of
30-36, La Salle Street, Chicago, Illinois, United States of America, Manufac-
turer) to be as follows:-
This invention relates to a device for preventing nuts from becoming loosened
on their bolts; this device being a helical spring ring threaded on the bolt and
tightly embracing it so that by its frictional grip it prevents the nut from unscrew-
ing, as I shall describe referring to the accompanying drawings.
Fig. 1 is a side elevation of a bolt and nut having my improved nut lock
applied thereto.
Fig. 2 is an end view.
Fig. 3 is a view similar to Fig. 2 but showing the manner in which the under
end of the ring is forced out when the nut is turned hard against it.
Fig. 4 shews the ring in section taken on line 4-4 of Fig. 3.
Fig. 5 is an edge view and Fig. 6 is a perspective of the ring alone.
A is a bolt and B its nut of any ordinary construction. C is the nut lock con-
sisting of a helical ring or coil of spring wire, made with its ends overlapping each
ather as shewn, and preferably with its extremities c bent outwards as handles
for screwing the ring on or off the bolt. The ring is coiled of less diameter than
the thread of the bolt so that when it is screwed upon the bolt it is sprung slightly
open and tightly grips the threads. This grip of the ring between the threads
is sufficient to prevent the nut from screwing itself back. When however, the
nut is turned so as to bear hard against the ring the end of the ring in contact with
the nut, is forced out of its thread and caused to ride up over the other part of the
ring, thereby forcing the latter more firmly into its seat between the threads and
at the same time increasing the hoop tension by which the ring grips the bolt,
more and more as the nut advances until the nut becomes quite locked. The
wire of which the ring is composed is preferably pear shaped in cross section
with its sharp edge turned inward.
Dated this 20th
1000
ABEL & IMRAY,
Agents for the Applicant.
I, OLIVER IMRAN, of Birkbeck Bank Chambers, Southampton Buildings, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
[Price 8d.]

page_text: invention (as communicated to me from abroad by William H. Carruthers, of
30-36, La Salle Street, Chicago, Illinois, United States of America, Manufac-
turer) and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement: -
This invention relates to a device for preventing nuts from becoming loosened
on their holts; this device being a helical spring ring threaded on the bolt and
tightly embracing it so that by its frictional grip it prevents the nut from unscrew-
ing, as I shall describe referring to the drawings accompanying my Provisional
Specification.
Fig. 1 is a side elevation of a bolt and nut having my improved nut lock
applied thereto.
Fig. 2 is an end view.
Fig. 3 is a view similar to Fig. 2 but showing the manner in which the under
end of the ring is forced out when the nut is turned hard against it.
Fig. 4 shews the ring in section taken on line 4-4 of Fig. 3.
Fig. 5 is an edge view and Fig. 6 is a perspective of the ring alone.
A is a bolt and B its nut of any ordinary construction. C is the nut lock con-
sisting of a helical ring or coil of spring wire, made with its ends overlapping each
other as shewn, and preferably with its extremities e bent outwards as handles
for screwing the ring on or off the bolt. The ring is coiled of less diameter than
the thread of the bolt so that when it is screwed upon the bolt it is sprung slightly
open and tightly grips the threads. This grip of the ring between the threads
is sufficient to prevent the nut from screwing itself back. When however the
nut is turned so as to bear hard against the ring the end of the ring in contact with
the nut, is forced out of its thread and caused to ride up over the other part of the
ring, thereby forcing the latter more firmly into its seat between the threads and at
the same time increasing the hoop tension by which the ring grips the bolt, more
and more as the nut advances until the nut becomes quite locked. The wire of
which the ring is composed is preferably pear shaped in cross section with its sharp
edge turned inward.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I hereby declare that I
make no general claim to wire embracing bolt beyond nut, but I declare that what
I claim is:
A nut lock consisting of a ring engaged between the threads of a bolt, the ends
of the ring overlapping each other and being bent outwards, substantially as
described.
ABEL & IMRAY,
Agents for the Applicant.