Improvements in Nut Locks
Year: 1895

page_text: Date of Application 30th Apr 1895-Accepted, 1st June, 1995
Improvements in Nut Locks
I, CFCIL URQUHARI FISHER of 45 Holborn Viaduct, London, in the County
of London, Solicitor and Patent Agent, do hereby declare the nature of this invention
communicated to me by Richard Arthur Hervey, of 28 Pitt Street Sydney New
South Wales Machinery Merchant and in what manner the same
performed to be particularly described and ascertained in and by the following
statement
-
is to be
I his invention relates to a nut lock it consists in cutting a drift partly through
the nut parallel with its thread or approximately so Any ordinary nut can be so
cut and in placing it on the bolt it is only neces ary to screw it home and then by
driving a chisel point or other suitable tool into the drift to open it a little,
and thereby cause the threads to bite and hold In an alternative arrangement, a
cut is made in the nut and expanded before the rut is tapped, and when the nut is
screwed home the threads are made to bite by closing the drift with a hammer
A nut so fixed can only be screwed off with a powerful spanner or like tool and
It
it may be replaced again without destroyin its own thread or that of the bolt
is very advisable when the nut is screwed off, to reclose or reopen the drift as the
When it is found difficult to screw off the
case may be before replacing the nut
nut, it may be eased by first closing the duft if it has been expanded, or conversely
by opening it if it has been closed in the locking
The invention is illustrated in the annexed sheet of explanatory diawings,
wherein
Fig 1 is a side view of a nut and bolt in the former of which a drift is cut as
above described, and Fig 2 a plan thereof,
Fig 3 is also a side view partly in section illustrating the appearance of the
drift when it has been opened sufficiently to lock the nut
A is the bolt shank, B the nut, C the drift therein, and D a face against which
the nut is screwed home The drift Chould extend nearly as far as half way
through the nut, but may be deep enough only to include from one fourth to
one third of the thread It need not be cut centrally although I have found it
preferable to place it at or near the middle of the nut The drift is opened or closed
sufficiently to make the thread of the nut bite tightly upon the thread of the bolt
By preference, the nut should not be deformed by expand ng or closing the drift
after tapping until it is screwed home, and then the opening tool or closing hammer
is used to effect the locking When the nut is to be locked by closing, the drift
may be formed wider at the mouth than at the base, this widening is done either
by removing metal in the cutting or by expanding the drift before the nut is
tapped
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same 19 to be performed, I declare that what I
claim is
1 A nut lock consisting of a cut or drift in a rut parallel with its threads or
approximately so, into which cut or dift when the nut is screwed home, an
opening tool is driven to widen it and cause the threads to bite, substantially as
described
2 A nut lock consisting of a cut or drift in a nut parallel with its threads or
approximately se, and formed in such a way as to permit of the separated parts

page_text: being closed when the nut is screwed home to make the threads of the nut and bolt
bite, substantially as described
ol .
11005
J E EVANS-JACKSON & Co,
Agents for the Applicant