Improvements in and relating to Nut Locks.
Year: 1890

page_text: Date of Application, 15th July, 1890-Accepted, 20th Sept., 1890
COMPLETE SPECIFICATION.
Improvements in and relating to Nut Locks.
I, FLETCHER ODELL BOSWELL, a citizen of the United States, residing at No. 373
South Fifth Street, in the City of Williamsport, County of Lycoming and State of
Pennsylvania, Carpenter, 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 :-
This invention consists in an automatic nut lock of novel construction, substantially
as hereinafter described and pointed out in the claims, the same being applicable to
bolts for uniting fish plates and railroad rails together and for other purposes.
Reference is to be had to the accompanying drawings forming a part of this
specification, in which similar letters of reference indicate corresponding parts in all of
the figures.
Figure 1, represents a partly broken view of a bolt with its nut and locking device
as applied to a railroad rail and its fish plates shown in horizontal section.
Figures 2 and 3 are transverse sections through the bolt upon the lines x-x
and y-y respectively, looking in reverse directions.
Figure 4, is a perspective view of the locking device of the nut detached, and
Figure 5 shows a modification of the nut lock.
A is a screw-threaded bolt applied to secure the rail-sections B B and fish-
plates C, C together. This bolt has a longitudinal groove b formed in and along its
screw-threaded portion, for a purpose that will be hereinafter described. D, is the
nut which is fitted to screw upon the bolt and which is constructed on its inner face
with a circular or other suitable shaped recess c and upon its outer side or face with
ratchet teeth d.
E, is the nut-locking device made of steel, so as to be yielding, and which is in the
form of a key adapted to fit within the longitudinal groove b of the bolt and
constructed, at its inner end, with an outwardly projecting side lip e which rests
within the recess c of the nut, and further constructed, at its outer end, with a lateral
outwardly projecting bent nose piece f that operates as a pawl to engage with the
ratchet teeth d on the outer face of the nut and serving as a spring pawl.
Upon screwing up the nut D on the bolt, it draws the key E, by its lip or head c,
up with it and along the groove b in the bolt and, as the nut is screwed up, causes
the spring or pawl part or nose-piece f of said key to engage with the ratchet teeth d
on the bolt, or with any one of them, and thereby holds the nut in place and from
being accidentally unscrewed or working loose.
In Figure 5 of the drawings I have shown a modification of the invention, in
which a washer. *, provided with a lip or extension is fitted upon the bolt; the
extension 7 of the washer entering the longitudinal slot of the bolt, and the spring
lips m at the edges of the washer being adapted to engage with the notches upon the
under face of the nut.
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. The combination of the bolt A having a longitudinal groove b in its screw
threaded portion, the nut D, having a recess c on its inner face and ratchet teeth d
on its outer face, and the spring nut locking key E adapted to slide along said groove
as the nut is screwed up on the bolt and provided with a lip or head e at one of its
ends, a pawl like nose fat its opposite end, for operation together, substantially as
described.

page_text: 2. In a nut lock, the combination with the screw bolt having a longitudinal groove
in its screw threaded portion, of a nut fitting said bolt provided with teeth upon its
outer face, and an independent sliding key within the groove applied to said nut, and
provided with a pawl like nose piece adapted to engage with the teeth on the nut
substantially as specified.
Tinted this 15th dow of T... 1960
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.