Improvements in Nut-lock Washers.
Year: 1890

page_text: Date of Application, 12th Aug.. 1890
Complete Specification Left, 12th May, 1891-Accepted, 13th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in Nut-lock Washers.
We, THE POSITIVE NUT LOCK WASHER COMPANY LIMITED and MURRAY
HINCKLEY SPEAR, Engineer, both of 1, Charlotte Street in the County of London,
do hereby declare the nature of this invention to be as follows :-
In Specification No. 5490 is described a nut lock washer and in Specification
10716 is described certain improved machinery for its manufacture.
Our present invention relates to further improvements on the class of washer
described in the said Specifications. We find by actual test that in some cases it
is extremely difficult to get the washer to cut into the nut sufficiently to lock same
on the bolt, prior to such washer exerting sufficient pressure to strip the thread
either of the bolt or of the nut. According to our present invention we propose to
modify the construction of washer by forming the rib of same of two or more
inclines which rise from the level of the metal to the top of the rib, and then either
drop suddenly back again to the level of the base of the rib, thus forming a species
of ratchet, or have a corresponding decline down to the level of the metal of the
washer proper.
Dated this 12th day of August 1890.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Nut-lock Washers.
We, THE POSITIVE NUT-LOCK WASHER COMPANY LIMITED and MURRAY
HINCKLEY SPEAR Engineer, both late of 1, Charlotte Street in the County of
London, but both now of Dashwood House, New Broad Street in the City of
London, 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 Specification No. 5490 is described a nut lock washer and in Specification
10710 is described certain improved machinery for its manufacture.
Our present invention relates to further improvements on the class of washer
described in the said Specifications. We find by actual test that in some cases it
is extremely difficult to get the washer to cut into the mut sufficiently to lock same
on the bolt prior to such washer exerting sufficient pressure to injure or strip the
thread either of the bolt or of the nut. According to our present invention we
propose to modify the construction of washer by forming the rib of same of two or
more inclines which rise from the level of the metal to the top of the rib, and then
either drop suddenly back again to the level of the base of the rib, thus forming a
species of ratchet, or have a corresponding decline down to the level of the metal
of the washer proper.
To clearly explain our invention reference is made to the accompanying drawings
in which Figs. 1, 2, and 3 represent in section, elevation and plan view respectively
a spring washer provided with four double inclined projections a a while Figs. 4,5
and 6 represent in corresponding views a washer provided with a species of ratchet
toothed projections a.
Either of the forms shown we find will secure the desired result but the double
inclined projections are more easily manufactured.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
The improvements in nut lock washers substantially as described.
Dated this 12th day of May 1901
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Agent for the Applicants.