Improvements in Locking Bolts and Nuts.
Year: 1897

page_text: Improvements in Locking Bolts and Nuts.
HARRY ROBERT BETTS, 258, Park Lane, Aston, Birmingham, Postman, do hereby
declare the nature of this invention to be as follows:-
The bolt contains millings down its sides into which a tooth which is let into the
side or on the top of the nut. engages into, thus forming a lock as the nut is
attempted to be undone. The tooth is fitted with a small button which if pressed
will allow of the nut being unscrewed without injury to the nut or bolt.
I, HARRY ROBERT BETTS, of 258, Park Lane, Aston, Birmingham, Postman, 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:
My invention has for its object the provision of simple and convenient automatic
locking device for preventing accidental detachment of a nut from its bolt.
In the accompanying sheet of explanatory drawings to be hereinafter referred
to-
Figure 1 is an elevation and Figure 2 a plan of a bolt and nut provided with my
improved locking device.
Figure 3 is an elevation of the bolt and nut at right angles to Figure 1, and
Figure 4 a plan showing the nut in section.
Figure 5 is an elevation of the nut with the toothed ratchet like pawl or catch
removed.
Figure 6 is a plan and Figure 7 an elevation of the toothed ratchet like pawl
or catch.
The same reference letters in the different views indicate the same parts.
Along the screwed portion of the bolt A I mill or otherwise form a slot B for
engagement with the toothed ratchet like pawl or catch C pivotted upon the nut A¹
as illustrated. The lateral tooth of the ratchet like pawl or catch C is forced into
the slot B of the bolt A by the action of a small spring as D placed in a suitable
pocket in the nut, and when thus in engagement the pawl or catch will prevent
detachment of the nut from the bolt. But by forming the slot of a shape or section
such as illustrated the nut can be turned in the direction of the arrow at Figure 4,
or the direction required for tightening, as by movement in such a direction the pawl
.
077

page_text: or catch tooth will be automatically withdrawn from the slot against the action of the
spring D.
.
The outer side or face of the shorter arm of the pawl or catch C I cause to project
slightly beyond the side of the nut, as illustrated at Figure 2, in order that the
placing of the spanner in position upon the nut shall force back the said shorter arm
and thus effect the withdrawal of the tooth on the longer arm from engagement with
the slot of the bolt A.
I sometimes make the slot B of a rectangular or such other section as will prevent
movement of the nut in either direction when the pawl or catch tooth is in engage-
inent. The catch must then be forcibly disengaged before any movement of the nut
can be effected as in this case the catch will not be automatically disengaged on the
movement of the nut in the direction of the arrow at Figure 4.
The locking catch can be varied in shape as may be desired, and be placed in any
suitable position upon the nut. I sometimes provide two or more engagement slots
as B in different positions around the bolt.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. An automatic locking device for preventing accidental detachment of a nut from
its bolt, substantially as described.
2. The combination with a bolt nut of a ratchet like pawl or catch and a spring
substantially as and for the purpose described and as illustrated.
3. The combination of a slotted bolt with a nut having a ratchet like pawl or catch
piece for engagement with the slot or slots of the bolt, substantially as and for the
purpose described and as illustrated.
Dated this DI
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.