Year: 1885

page_text: I, AISIK SCHAPIRO, of 70 Alexanderstrasse Berlin in the Empire of Germany
Merchant 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 relates to screws with secured nuts and bas for its object to render
the locking of the nuts to the bolts, in any desired position, more easily and simpler
than heretofore has been the case.
Previous to my invention the nuts have been generally fastened to the part
against which they are screwed, which mode of fastening is defective as it does not
prevent the bolt from unscrewing, caused by shocks.
To remedy this defect I cause a direct fastening between the nut and bolt, in such
a manner that the nut or bolt cannot change their relative position to each other,
which renders an accidental unlocking impossible.
•
The means for ensuring such a fastening between nut and bolt, in any desired
position consists in the employment of a flat, projection, indentation or recess, on
the bolt or screw end, which engages a projection formed on a metal disc which
latter grips the nut and prevents it from unscrewing.
By these means the nuts get secured to the bolts in any desired position, as soon
as the nut has been screwed tight.
And in order that my invention may be better understood I have caused to be
appended hereunto, one sheet of drawings marked with letters of reference indicating
like parts in the various figures.
Figs. 1. 2 & 3 are side views & Figs. 4. 5. & 6 plans, respectively.
Figs. 1 & 4 show my invention in its simplest construction, m is the metal plate,
which is formed with two prongs m¹ bent downwardly and fitting against and
engaging the hexangular flats of the nut.
The plate m has a circular aperture o through which the end of the bolt passes,
the inner edge of the plate, which is bent upwards, is caused to embed itself into
the recess, or fit against the flats, suitably formed on the bolt end, as soon as the
nut is screwed tight.
Figs. 2 & 5 show a modification of my invention in which the flat or recessed
part von the bolt end is formed in the centre thereof, being of a square shape, in
which the centre of the metal disc m' gets pressed.

page_text: Fig. 3 & 6, show another modification of my invention, in which the end of the
bolt is formed with a slot, which receives a square pin projecting on each side of
the bolt, over which square pin the metal disc ms is bent by means of a suitable
tool, which ensures a secure fastening between the nut and bolt.
The advantages gained hereby over the usual complicated nut locks, consist
principally in the simplicity of the metal disc, which by a simple blow thereon
secures the nut in any position to the bolt, which fastening may just as easily be
undone when desired by rebending the metal plate.
Such nut lock can be made very cheap, and is exact in its functions, it may be
applied to any construction of screw, its action is certain and the nut and bolt
cannot get fast to each other, on account of corrosion.
Having now particularly described & ascertained the nature of my invention and
in what manner the same is to be performed I declare that what I claim is
In nut locks, the employment of a metal plate fitting against the nut and
capable of being turned, in combination with a bolt, which latter is formed or
provided with a flat, recess, or projection, formed on the end thereof, against which
flat, recess, or projection, the metal plate is pressed or fitted mechanically, thereby
obtaining a direct fastening between the nut and bolt, substantially as described
and illustrated in the accompanying drawing and for the purpose specified.
Dated this 28th day of August 1885.
Pro AISIK SCHAPIRO.
Bosshardt & Grant,
Agents to the Applicant.