AN IMPROVED LOCKING NUT AND WASHER FOR SCREW BOLTS
Year: 1878

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for the Invention of
"AN IMPROVED LOCKING NUT AND WASHER FOR SCREW BOLTS." A communi-
cation from abroad by August Bastert, of Melbourne, Victoria, Australia,
Engineer.
Sealed the 3rd December 1878, and dated the 27th September 1878.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 27th September 1878.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED LOCKING NUT AND WASHER
FOR SCREW BOLTS." [A communication from abroad by August Bastert, of
Melbourne, Victoria, Australia, Engineer.]
It is well known that the ordinary method of locking a nut on a screw is to put
on a second nut which is called a lock nut.
According to the present Invention I dispense with the second nut altogether,
and instead thereof I provide a spring pin which passes quite through the only nut
I use, and when not forced back projects a little beyond its face. This pin travels
over the face of the metal washer, which instead of being a plain disc of metal has
its upper face made into a series of inclined planes or ratchet teeth, the lines of
which teeth radiate from the centre to the circumference. These teeth are in such
a direction that when the nut is being screwed on the spring pin travels over the
teeth in succession, but locks against them immediately any attempt is made to
turn it in an opposite direction. To release it all that is necessary is to raise the
spring on the outer face of the nut so as to draw the spring pin into the body of
the nut, when the latter can be unscrewed like an ordinary nut. Some provision
has to be made on the screw to prevent the rotation of the washer, such, for
instance, as a slot to receive a feather, or one side of the screw may be flattened, as
will be well understood.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by.
the said William Robert Lake in the Great Seal Patent Office on the 25th
March 1879.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, &
Southampton Buildings, London. "AN IMPROVED. LOCKING
FOR SCREW BOLTS." A communication from abroad by
Melbourne, Victoria, Australia, Engineer.
Co., Patent Agents,
NUT AND WASHER
August Bastert, of
It is well known that the ordinary method of locking a nut on a screw or screw
bolt is to put on a second nut which is called a lock nut.
According to the present Invention I dispense with the second nut altogether,
and instead thereof I provide a spring pin which passes quite through the only nut
use, and when not forced back projects slightly beyond its face. This pin travels
over the face of the metal washer, which instead of being a plain disc of metal has
its upper face formed with a series of inclined planes or ratchet teeth, the edge
lines of which teeth radiate or extend from the inner edge to the circumference of
the washer. These teeth occupy such a position that when the nut is being screwed
on the bolt the spring pin travels over the teeth in succession, but locks or engages
with them immediately any attempt is made to turn it in an opposite direction.
To release it all that is necessary is to raise the spring on the outer face of the nut.
so as to draw the spring pin into the body of the nut, when the latter can be
unscrewed like an ordinary nut. Some provision has to be made on the screw or
bolt..to prevent the rotation of the washer, such, for instance, as a slot to receive
a. feather, or one side of the screw may be flattened, as will be well understood.
In the accompanying Drawing,―
Figure 1 is a plan, and
Figure 2 a side elevation of the said nut.
Figure 3 is a plan, and
Figure 4 an edge view of the said washer.
Figure 5 represents them both in position on a screw bolt.
Figure 6 is a transverse section on the line x, x, Figure 5.
A is the spring of the pin A'; B, B, are the ratchet teeth on the face of the said.
washer; C is the screw bolt, which, as shewn in Figure 6, has a flattened side C¹ to
correspond with the flat part B' of the hole in the washer to prevent the rotation
of the latter.
Having thus fully described the said Invention as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it understood
that I claim,-
The nut with a spring pin passing through it and the washer with the inclined
planes or ratchet teeth on its face, combined and operating in the manner and for
the purpose set forth.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Twenty-fifth day of March, in the year of our Lord One
thousand eight hundred and seventy-nine.
WM PORT TAZE