provements in Means for Securing Screw Nuts in Position upon Screws.
Year: 1893

page_text: Date of Application, 20th Dec., 1893
Complete Specification Left, 17th Jan., 1894-Accepted, 24th Feb., 1894
PROVISIONAL SPECIFICATION
Improvements in Means for Securing Screw Nuts in Position
upon Screws.
We, OLIVER JOSOLYNE ELLIS of 29 Victoria Road, Old Charlton in the County
of Kent, Engineer and EVERARD HESKETH and ALEXANDER MARCET both of
23 St. Swithins Lane in the City of London, Engineers do hereby declare the
nature of this invention to be as follows:-
This invention has for its object to provide simple and efficient means whereby
screw nuts and screws can be secured in position with facility. The invention is
more especially designed for use with the screw nuts by which pistons are secured
in position upon piston rods but it is not limited thereto. According to this
invention the nut (which with small pistons may constitute the piston itself) is
provided with a spring and the rod upon which the nut is screwed is provided
with a circular series of projections preferably in the form of ratchet teeth with
the radial faces in the direction such that the spring with which the nut is provided
bears against the faces in the direction necessary to lock the nut against tendency
to become displaced. A convenient arrangement for retaining the spring in place
is to make a recess for it in the nut the recess opening opposite the ratchet teeth
or series of projections on the rod or the like and also opening at the face of the
nut for the insertion and removal of the spring when desired. The spring being
a double armed spring can be compressed for insertion in the recess which
recess is undercut so that when the spring is released and the arms spread out one
of them is received in the undercut part and the other protrudes from the recess
to engage with the ratchet teeth or projections as aforesaid. Although we have
mentioned the spring as being carried by the nut and the teeth or projections by
the rod or the like the spring may be carried by the rod or the like and the
ratchet teeth or projections be arranged as an internal series in the nut.
Dated 20th December 1892
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
3
..
COMPLETE SPECIFICATION.
Improvements in Means for Securing Screw Nuts in Position
upon Screws.
We OLIVER JOSOLYNE ELLIS of 29 Victoria Road, Old Charlton, in the
County of Kent, Engineer and EvERARD HESKETH and ALEXANDER MARCET
both of 23 St. Swithins Lane in the City of London Engineers 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 has for its object to provide simple and efficient means whereby
screw nuts and screws can be secured in position with facility. The invention is
more especially designed for use with the screw nuts by which pistons are secured
in position upon piston rods; or nuts which constitute part of the piston but it is
not limited thereto. According to this invention the nut (which with small
pistons may constitute the piston or part of the piston itself) is provided with a
spring and the rod, or stem, upon which the nut is screwed is provided with a
circular series of projections, preferably in the form of ratchet teeth with the

page_text: radial faces in the direction such that the spring with which the nut is provided
bears against the faces in the direction necessary to lock the nut against tendency
to become displaced. A convenient arrangement according to this invention is
illustrated by the. accompanying drawing as applied to a small piston in which the
nut constitutes part of the piston body.
Figure 1 is a longitudinal section and Figure 2 is an end view.
a is the piston rod having a head a' constituting part of the piston body and a
screwed stem a³ for the reception of the nut 6 constituting another part of the
piston body and provided with recesses for the reception of the spanner for
turning it. care the cup leathers and d the plates by which they and the parts
of the piston head, are confined in position. In the nut b is formed the recess 6*
opening opposite the ratchet teeth or series of projections a' formed on the stem
beyond the screw a the said recess also opening at the face for the insertion and
removal of the spring c³ when desired. The spring being a double-armed spring.
can be compressed for insertion in the recess 6 which recess is undercut so that
when the spring is inserted and released, and the arms spread out, one of the said
arms is received in the undercut part and the other protrudes from the recess to
engage with the ratchet teeth, or projections, as aforesaid. The head of the
spring may also be received in an undercut part of the recess. Although we have
mentioned the spring as being carried by the nut and the teeth, or projections,
by the rod, or the like, the spring may be carried by the rod, or the like, and the
ratchet teeth, or projections, be arranged as an internal series in the nut.
As the nut is screwed up the ratchet teeth a pass the spring by compressing
it and as each tooth is passed the spring returns so that one end of the spring
bears on the face of the tooth next it and so the nut is secured against back
turning whilst when the nut is to be unscrewed the spring can be readily compressed,
and, if required, removed to allow of unscrewing.
From the foregoing description it will be readily understood that this invention
can similarly be applied to nuts and screws of other descriptions than those of
pistons as shewn,
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In combination with piston, or other, nuts, and the screws upon which they
are screwed, of ratchet teeth, or like projections, and a spring for preventing
displacement of the nut by bearing on the said teeth, or projections, substantially
as herein before described.
2. The combination of a nut having a recess, opening as described, and a series
of ratchet teeth on the screw, and a spring situated in the said recess, and
engaging with the ratchet teeth, substantially as hereinbefore described.
3. A piston having a piston nut provided with a recess containing a spring, and
a screwed stem provided with ratchet teeth, substantially as and for the purpose
hereinbefore described, and as shewn in the accompanying drawings.
Dated this 17th day of January 1894.