Improvements in Lock-nuts.
Year: 1897

page_text: Date of Application, 17th Aug., 1897-Accepted, 18th Sept., 1897
Improvements in Lock-nuts.
I, FRANK HEWLETT, Saddler of Lime Croft, Twyford, Hampshire, 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 relates to improvements in lock-nuts and has for its object to
provide a simple means for locking the said nuts upon their bolts in any required
position.
For this purpose I form the nut with a recess of about one-eighth of an inch in
depth in which is pivoted a small lever or catch one end of which is formed with
a point or tooth caused to engage with the screw-thread of the bolt and with
notches formed therein. The other or tail end of the said catch is formed of an
angular bevelled shape and projects a short distance beyond the side of the nut
and against it bears a small spiral or other spring carried into the recess for
keeping the tooth in gear with the said notches. The said recess is formed in the
upper face of the nut and a shield or plate of the same shape as the nut is fixed
by means of rivets or pins to the said upper face so as to cover the recess and keep
the catch in position. In order to screw the nut upon the bolt the operating
spanner is engaged with the nut so as to cause one side of the same to press against
and force inwards the bevelled projecting end of the spring catch thus discon-
necting the tooth of the latter from its contact with the bolt and permitting the
nut being turned as far as required, but immediately the spanner is removed the
spring forces the point or tooth of the catch into gear with the notches in
the bolt and prevents the nut being turned or shifted in the contrary direction.
In the accompanying sheet of drawings Fig. 1 represents a plan or face view
of one of my improved lock-nuts and Fig. 2 is a side view of the same. Fig. 3
is a plan of the nut with the shield or upper plate removed. Fig. 4 is a similar
view showing the recess with the spring catch removed and Fig. 5 is a plan of
the shield or top plate.
Upon the upper face a of the nut is cut or formed the recess a¹ of a suitable
shape to receive the catch or small lever pivoted at 61 therein, the said recess
being about one-eighth of an inch in depth and the catch of the same thickness.
The catch is formed with a tooth 62 at one end and an angular bevelled tail-
piece at the other end which projects in its normal or locked position, beyond
the side of the nut, being kept in this position by means of the small spiral spring c
carried in the recess and bearing against the said tail piece 63. The upper face
of the nut is provided with three small pins d projecting about one eighth of an
iuch above the said face so as to engage with three holes e formed in the upper
plate or shield f by which the latter is rivetted to the nut.
My improved nut may be screwed up without the use of a spanner when
sufficiently loose, but it can only be unscrewed by engaging the spanner there-
with in the ordinary manner so as to cause one of its jaws to bear against the
bevelled end 3 of the catch forcing it into the recess a¹ and disconnecting the

page_text: tooth from the notches in the bolt, which notches may be made by a chisel or
similar instrument.
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) In an improved lock-nut forming the upper face thereof with a recess in
which is pivoted a spring catch or small lever formed at one (end with a tooth
engaging with notches in the bolt, and at the other end with a bevelled tail-piece
projecting a short distance beyond the side of the nut when in its normal or locked
position, the said spring catch or lever being kept in position in the recess by
means of a plate or shield fixed to the top face of the nut substantially as described
and for the purposes specified.
(2) In an improved lock-nut the combination with the said nut of the recess a¹,
cach or lever 6 pivoted at 61 and formed with a tooth 62 and bevelled tail-piece b³,
the spring c, pins and shield or plate f provided with holes e substantially as
described and for the purposes specified.
(3) The improvements in lock-nuts substantially as described and shewn in the
drawings.
Dated this 6th day of August 1807
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.