An Improved Folding or Shut-knife or Dagger.
Year: 1893

page_text: Date of Application, 29th Apr., 1893-Accepted, 12th Aug., 1893
COMPLETE SPECIFICATION.
An Improved Folding or Shut-knife or Dagger.
We HERMANN WILHELM CHRISTIANS and ERNST RUDOLPH CHRISTIANS,
trading as Christians Bros. of Solingen in the Empire of Germany, Cutlery
Manufacturers, do hereby declare the nature of this invention and in what manner
the same is to be perforined, to be particularly described and ascertained in and by
the following statement :-
.
This invention is designed to supply a shut up or pocket knife or dagger the
blade of which is kept perfectly rigid and firm in both positions, i.e. closed or open.
To effect this a locking action is attached to a spindle or fixed arbor solidly
attached to the blade, and this lock action is unfastened for opening or closing the
blade by means of a small cam, lever or wedge pivotted through and recessed in a
plate at the back of the haft, which lever raises the outer leaf of the haft and so
frees a stud on the arbor, and thus allows the blade to turn with the arbor.
I will now describe the invention with reference to the accompanying drawings,
in which :-
Fig. 1 shews the blade a of the knife with its fixed arbor a', and stud 6 which
fits into a square hole b¹ in the outer leaf d of the haft h.
с
Fig. 2 shews a small cam or lever c attached to the end of which is a ring c'; this
lever is fitted into the back of the knife and when turned, presses the leaf d outwards
so as to disengage it from the stud b.
Fig. 3 shews one side of the haft h, with the blade open. a is the blade. b is
the stud in its engaged position inside the hole b¹.
The lever c, operated by the ring c¹, pivotted through the plate e, when turned
thrusts out the leaf d and allows the stud b to become disengaged from the hole b¹
as shewn in Fig. 4. The blade can then be closed."
When the knife is closed and it is desired to open it, the lever c must be first
turned and the stud disengaged. The spring & inside the haft, shewn in dotted
lines then serves to push open the blade a.
Fig. 4 shews a front view of the knife.
The lever c which is hidden behind the stud b in this figure has been turned so
as to disengage the stud by thrusting out the leaf d. The blade is shewn partly
open.
It will be understood that the stud 6 may be of any preferred shape other than
round, provided the hole be of corresponding outline so as to engage with it and
form a rigid lock when the blade is closed or fully open.
Similarly the ring c¹ may be replaced by a solid bar or by a hinged bar or any
other convenient appliance for operating the lever c.
This invention is not confined to the pattern of knife shewn in the drawings_but
is applicable to any description of clasp or shut knife and is especially adapted to
large and strong knives of various kinds. Any desired pattern of haft can be
adapted to it, and additional blades can be used if desired.
The corkscrew shewn can be omitted or another tool substituted.
The round end of the arbor a' may be enlarged by fitting on an annular ring to
promote steady and frictionless action of blade.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. In a knife, tool or instrument with folding blade, an arbor or axis solidly
attached in the hand of the blade maid anhan hazing at
one and
nraiestince atud

page_text: for engaging with a suitable hole or slot in the outer surface of the haft as herein
described and set forth.
2. In a folding knife, tool or instrument, a haft fitted with a spring action outer
leaf on one side, said leaf having a suitable hole or slot to receive a stud on the end
of the arbor of the blade, as herein described and set forth.
3. In a folding knife, tool or instrument a cam or lever fitted inside haft, with bar
or ring outside for operating same, the axis of said lever or cam passing through
and pivotted in a plate at back of haft, which plate may be attached to backspring
of knife as herein described and set forth.
4. In a folding knife, tool or instrument the combination of the foregoing parts
with an internal spring for throwing up the blade as herein described and set
forth.
:
1
1
001
100
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.