An Improved Lock Nut.
Year: 1897

page_text: An Improved Lock Nut.
I, WILLIAM WARREN, Dalston Villa, Newhall, near Burton-on-Trent, in the
County of Stafford, Manufacturer, do hereby declare the nature of my said inven-
tion to be as follows:-
My invention has for its object an improved lock nut which will automatically
lock itself thus preventing all possibility of the nut being lost which so frequently
happens and which is often the cause of accidents.
In carrying my invention into practice I pivot to the face or back of the nut
a pawl or catch which takes into V shaped grooves, cut longitudinally in the screw
thread on which the nut is screwed and preferably rounded at one edge. This
pawl or catch is held in the groove by a spring or its equivalent fixed to the side
or other convenient part of the nut. In some cases I may pivot the pawl or catch
in a slot cut in the centre of the nut and a small moveable catch may be fitted
into the edge of the nut which when moved forward will press upon the pawl
thus holding it in position. By placing the spanner onto the nut the pawl or
catch is pressed out of contact with the groove or grooves thus liberating the nut
which can then be unscrewed. Or the pawl or catch may be held out of contact
with the grooves by other suitable means when unscrewing the nut.
this C
100
GEORGE BARKER,
Agent for Applicant, 77, Colmore Row, Birmingham.
1, WILLIAM WARREN, of Dalston Villa, Newhall, near Burton-on-Trent,
Engineer, do hereby declare the nature of my said invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:
My invention has for its object an improved lock nut which will automatically
lock itself thus preventing all possibility of the nut being lost which so frequently
happens and which is often the cause of accidents.
In carrying my invention into practice I pivot to the face or back of the nut a
pawl or catch which takes into V shaped grooves, cut longitudinally in the screw
thread on on which the nut is screwed, and preferably rounded at one edge. This
pawl or catch is held in the groove by a spring or its equivalent fixed to the side
or other convenient part of the nut. In some cases I may pivot the pawl or
catch in a slot cut in the centre of the nut and a small movable catch may be
CD 0.77

page_text: fitted into the edge of the nut which when moved forward will press upon the
pawl thus holding it in position By placing the spanner onto the nut the pawl or
catch is pressed out of contact with the groove or grooves thus liberating the nut
which can then be unscrewed. Or the pawl or catch may be held out of contact
with the grooves by other suitable means when unscrewing the nut.
In order that my invention may be more clearly understood and easily carried
into practical effect I have appended hereunto a sheet of drawings upon which I
have illustrated examples of my improved lock nut.
Figure 1 is a front elevation of my lock nut screwed partly onto the bolt B.
Figure 2 is a plan view of Figure 1.
Figure 3 is a similar view to Figure 1 shewing another form of my lock nut.
Figure 4 is a sectional plan view of Figure 3:
Figure 5 is a similar view to Figure 4 shewing the pawl or catch out of contact.
Figure 6 shews an elevation of a bolt or screw.
Figure 7 is a plan view of Figure 6.
Figure 8 is a sectional plan view of a nut with the spring cover N.
Figure 9 is a perspective view of the spring cover N.
In carrying my invention into practice I form the recess a¹ on the face of the
nut A or the recess may be formed at the back of the nut and in this recess I
pivot the pawl or catch a the end of which projects beyond the bore of the nut
so as to take into the V shaped grooves.¹ formed longitudinally in the bolt B or
its equivalent as clearly shewn on the drawings. This pawl or catch is held in
its normal position by the spring S which is secured to the side or other con-
venient part of the nut a recess being preferably formed in which the spring is
fixed so as to keep it flush with the sides of the nut. Instead of pivoting the
pawl or catch in a recess it may be pivoted to the face or back of the nut.
In some cases I may pivot the pawl or catch a² in the slot a³ which is cut in
the side of the nut as shewn at Figures 3 4 and 5 and rivet the spring $ at s¹ and
in order to hold the catch out of contact with the screw bolt B when unscrewing
the nut I form the hole a through the nut and a corresponding hole in the
pawl or catch so that when the end a of the pawl or catch is pressed inwards so
as to be flush with the sides of the nut and the peg a' inserted into this hole it will
hold the catch in the position as shewn at Figure 5. Or the pawl or catch may be
pressed out of contact with the grooves in the bolt B by the spanner or wrench
or equivalent when unscrewing the nut.
At Figures 6 and 7 I have shewn the bolt B with six grooves but it must be
understood there may be more or less than the number of grooves shewn. These
grooves are preferably formed with a rounded edge on one side so as to enable the
pawl or catch to easily slide out of the groove when screwing up the nut.
For the purpose of preventing dust or dirt entering the slot and thus inter-
fering with the free action of the pawl or catch, I provide the spring cover N
as shewn at Figure 9, which fits around the sides of the nut and is held in position
by the projections n¹ which fit into corresponding recesses formed in the sides
of the nut as shewn at Figure 8 The bulged out portion n² is formed so as to
allow, room for the free action of the pawl or catch.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is:-
CLAIMS.
First. The improved lock nut consisting essentially of the nut A having a
pawl or catch such as a² mounted or pivoted in a recess such as a¹ or in a slot such
as a³ the said pawl or catch being held in the groove 61 formed longitudinally in
the bolt B or its equivalent by any suitable spring S or its equivalent which causes
the pawl or nut to catch in the thread of the bolt and prevents it from turning
backwards in the manner and for the purpose substantially as hereinbefore
described and as shewn upon the' accompanying sheet of drawings.

page_text: Second. In lock nuts as claimed in the preceding claim forming a hole a' in
the nut and a corresponding hole a³ in the pawl or catch for inserting a peg or
pin for holding the pawl or catch out of contact with the bolt in the manner sub-
stantially as herein set forth and as shewn upon the drawings.
Dated this 23rd day of December 1897.
GEORGE BARKER,
Agent, 77, Colmore Row, Birmingham.