AN IMPROVED POCKET- KNIFE
Year: 1879

page_text: LETTERS PATENT to Carl Alfred Sundström, of Stockholm, in the Kingdom
of Sweden, Civil Engineer, for the Invention of "AN IMPROVED POCKET-
KNIFE."
Sealed the 13th February 1880, and dated the 18th August 1879.
PROVISIONAL SPECIFICATION left by the said Carl Alfred Sundström at
the Office of the Commissioners of Patents on the 18th August 1879.
CARL ALFRED SUNDSTRÖM, of Stockholm, in the Kingdom of Sweden, Civil,
Engineer. "AN IMPROVED POCKET-KNIFE."
This Invention of an improved pocket knife relates to arrangements enabling the
blade of the knife to be easily renewed in case of breakage, and also other instru-
ments, such as saws or similar tools to be substituted for the knife blade. For
these purposes the back end of the knife blade is provided, with a curved groove
or recess which fits on a pin fixed in the knife-handle, the blade end being pushed.
off or on the pin to take it out of or put it into the handle. On another pin in the
handle is a spring, made moveable around such pin; this is held normally with its:
one end against the root of the blade by means of an eccentric disc which presses
the back end of the spring upwards, thus the blade is kept in place. The spring
can be released by turning round an arm formed with the eccentric disc, and which
is provided with a notch to enable it to be raised or moved with the nail.
The other instruments to be used in, the same handle are made with their back:
ends similar to that of the knife blade.
:
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Alfred Sundström in the Great Seal Patent Office on the 18th
February 1880.
CARL ALFRED SUNDSTRÖM, of Stockholin, in the Kingdom of Sweden, Civil
Engineer. "AN IMPROVED POCKET-KNIFE."
This Invention of an improved pocket knife relates to arrangements enabling the
blade (or blades) of the knife to be easily renewed in case of breakage, and also
other instruments, such as saws or similar tools to be substituted for the knife blade
(or blades).

page_text: For these purposes the back end of the knife blade is provided with a curved
groove or recess which fits on a pin fixed in the knife handle, which is provided
with a spring and with an eccentric disc, substantially as hereinafter described.
Referring to the accompanying Sheet of Drawings,―
Fig. 1 is a longitudinal section of a knife according to this Invention, the knife
being shewn closed.
Fig. 2 is a similar view shewing the knife open.
Fig. 3 is a like view shewing the spring released; and
Fig. 4 an arrangement in which the form of the spring and of the back end of
the blade are somewhat modified. The back end of the knife blade is provided
with a curved groove or recess a, which fits on a pin b fixed in the knife handle,
as shewn, the blade end being pushed off or on the pin to take it out of or put it
into the handle, as the case may be. On another pin c in the handle is a spring s,
made moveable around such pin. This spring is held normally with its one end
against the root of the blade by means of an eccentric disc d, which presses.the
back end of the spring s upwards. Thus the blade is kept in place, as indicated
in Figs. 1 and 2.
The spring can be released by turning round an arm e formed with the eccentric
disc d, and which is provided with a notch f to enable it to be raised or moved
with the operator's nail. The other instruments to be used in the same handle are
made with their back ends or roots similar to the grooved or recessed back end or
root of the knife blade represented in the Drawings.
By arranging the disc & and arm e so as to fit completely within the handle and
lengthwise thereof, as described, the blade is securely fixed in the handle so as not
to be liable to accidental loosening, and the arrangement is also such as may be
advantageously used in very small knives.
Having described the nature of the said Invention, and explained the manner of
carrying it into practical effect, I hereby declare that what I consider to be novel
and original, and therefore claim as secured to me under the Letters Patent herein-
before in part recited is,-
1. The method, substantially as herein before described and illustrated, of securing
a knife blade or tool in a handle so as to be readily removeable therefrom, by
forming the back end or root of such blade or tool with a curved groove or recess
arranged to fit on a pin in the handle and be there held by a spring.
2. The method, substantially as hereinbefore described, of causing a spring
moveable on a pin in a knife handle to secure a blade or tool in such handle, and
enable it to be readily removed from the handle by the use, in conjunction with such
spring, of an eccentric disc moveable on a pin fixed in the handle, and provided
with a notched arm or part for operating it by the nail.
3. The improved clasp knife, constructed substantially as hereinbefore described
and shewn in the Drawings, so that blades or other. tools can be readily put in or
taken out and exchanged.
In witness whereof, I, the said Carl Alfred Sundström, have hereunto set
my hand and seal, this Eighteenth day of December, in the year of our
Lord One thousand eight hundred and seventy nine.
CARL ALFRED SUNDSTRÖM. (L.S.)