IMPROVEMENTS IN NUT SECURING DEVICES
Year: 1880

page_text: LETTERS PATENT to Maurice Bauer, Civil Engineer, of the Firm of M. Bauer
and Company, Solicitors of Patents, of 30, Boulevart' Magenta, Paris, in the
Republic of France, for an Invention of "IMPROVEMENTS IN NUT SECURING
DEVICES." A communication from Pierro Delpech, of Maubeuge (Nord),
in the Republic of France.
PROVISIONAL SPECIFICATION left by the said Maurice Bauer at the Office
of the Commissioners of Patents on the 23rd January 1880.
MAURICE BAUER, Civil Engineer, of the Firm of M. Bauer and Company,
Solicitors of Patents, of 30, Boulevard Magenta, Paris, in the Republic of France.
"IMPROVEMENTS IN NUT SECURING DEVICES." A communication from Pierre
Delpech, of Maubeuge (Nord), in the Republic of France.
The Invention has for its object to prevent the unintended slackening of screw
nuts, and consists in cutting into the circumference of the bolt a groove parallel
with the axis of the bolt, and providing the inner surface or thread of the nut
with notches, preferably placed at equal distances from each other, said groove
being large enough to receive a V shaped spring, the inner side of which is
provided with a nose, which fitting into a corresponding recess of the bolt prevents
the spring from coming out accidentally after having once been inserted into the
groove. For inserting the spring between the bolt and nut the latter is turned
until one of its notches lies exactly opposite the groove of the bolt, the two branches
of the spring are then pressed together by the fingers, the spring placed in the
groove and the two branches allowed to open under the influence of their elasticity,
so that the outer branch falls into the notch of the nut.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Maurice Bauer in the Great Seal Patent Office on the 22nd July
1880.
MAURICE BAUER, Civil Engineer, of the Firm of M. Bauer and Company,
Solicitors of Patents, of 30, Boulevard Magenta, Paris, in the Republic of France.
"IMPROVEMENTS IN NUT SECURING DEVICES." A communication from Pierre
Delpech, of Mauberge (Nord), in the Republic of France.
This Invention relates to certain improvements in nut securing devices, and
consists of a single spring piece having two arms, together forming a V shaped
spring formed so as to engage in grooves in the bolt and nut.
In the Drawings, Fig. 1 represents a bolt and nut fitted together and with the
securing device in position; Fig. 2 is an under view of Fig. 1 ; Fig. 3 represents the
bolt partly in section, showing the longitudinal groove therein for the securing key
piece; Fig. 4 is like section of the nut, and Fig. 5 is side view of the key piece.
The arm a of the said securing key is designed to take up its position in the
longitudinal groove D formed in the screwed end of the bolt A, and is furnished
with a talon or catch d; the other arın b of the key is designed to engage in one
of the notches provided in the nut, the unscrewing of which is to be provided
against.
The bolt A, which has to receive the as in its screwed end a groove
furnished with a notch d¹ for reception of the catch d of the key.
The nut B of the bolt is provided, as shown, with several notches made interiorly
thereof in the screwed part.
In order to apply the key c to the bolt A it is only necessary to press the two
arms a and b together by the finger, and with the ends thus in juxtaposition it is
introduced into the groove D of the bolt after having previously made one of the
notches of the nut correspond with the groove D, and upon opening the fingers
the arm b by its elasticity takes up its position in the corresponding notch of
the nut.
Thus placed this key c is held by its catch d in the notch d' of the groove D,
and placed in the sense of the impossibility of displacement in the axis of the bolt.
When it is required to screw up the nut the arm b by reason of its elasticity
yields under the pressure due to the screwing until it meets another notch of the
nut when it again refixes itself.
The notches of the nut are of triangular section, and arranged so as to oppose
or "stop" against the unscrewing of the nut in the sense of the path of the screw.
From the foregoing description it will be understood that the screwing of the nut
may be graduated, the degree of screwing varying with the spacing of the notches
in the nut; on the other hand this screwing may be effected without it being
necessary to remove the key which remains in place during the screwing. The
only case of necessity for removing the key c is when it is required to unscrew the
bolt nut.
The capital point of the Invention lies in the employment of a single piece spring
key composed of two arms of a V shape, as shown in Fig. 5, the one arm a fixing
itself in the groove of the screw bolt, and the other arm b lodging in the notch of
the nut; this latter operating as a ratchet and catch.
Having now described the nature and particulars of the said Invention, I
claim,―
The application to all bolts, of which the unscrewing from the nut is to be
prevented, particularly in fixed machines, or machines or apparatus of rolling stock
or fixed material of railways, axle trees of carriages, and so forth, and generally

page_text: any construction consisting of screw bolts and nuts of the improved nut securing
devices, constructed and operating as and for the purpose herein set forth and as
shown by the Figures of the accompanying Drawings.
In witness whereof, I, the said Maurice Bauer, have hereunto set my hand
and seal, this Nineteenth day of July, in the year of our Lord One thousand
eight hundred and eighty.
Witness,
LORENTZ ALBERT GROTH.
MAURICE BAUER. (L.S.)