Construction of Puzzle Pocket Knife.
Year: 1891

page_text: Date of Application, 16th Nov., 1891
Complete Specification Left. 16th Aug. 1892-Accepted, 1st Oct., 1892
PROVISIONAL SPECIFICATION.
Novel Construction of Puzzle Pocket Knife.
I, WILLIAM JAMES HARRIS, of 219 Old Kent Road, Surrey, do hereby declare
the nature of this invention to be as follows:-
-
This invention has for object, the construction of a pocket or clasp knife in such
a manner that it can only be opened after certain manipulations of moveable parts
which carry the blade round and fix it in a firm open position, a reverse action of
the moveable parts returning and fixing the blade in a closed, or shut up
position.
For the purpose of this invention, the shank of the blade has a stud projection
from either side at a short distance from the pivot pin, which is fixed to one half
handle, the other half handle being free to pivot round the pin. Both half handles
are notched for the stud projections to engage in for fixing the blade in either
position (open or closed).
The fixed half handle near the butt has a spring, or other kind of catch for
fixing the moveable half handle, which spring or other fastener can be slid
outwards, or turned, or pressed, or otherwise acted upon for its release.
Dated this 16th day of November 1801
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said William James Harris.
COMPLETE SPECIFICATION.
Novel Construction of Puzzle Pocket Knife.
1, WILLIAM JAMES HARRIS, of 219 Old Kent Road, Surrey, Manufacturer, 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:-
This invention has for object, the construction of a pocket or clasp knife in such
a manner that it can only be opened after certain manipulations of movable parts
which carry the blade round and fixes it in a firm open position, a reverse action of
the movable parts returning and fixing the blade in a closed or shut up
position.
For the purpose of this invention, the shank of the blade has a stud projection
from either side at a short distance from the pivot pin, which is fixed to one half
handle, the other half handle being free to pivot round the pin. Both half handles
are notched for the stud projections to engage in for fixing the blade in either
position (open or closed).
The fixed half handle near the butt has a spring or other kind of catch for
fixing the movable half handle, which spring or other fastener can be slid outwards,
or turned, or pressed, or otherwise acted upon for its release.
My invention will be understood by the annexed drawings.
Figure 1 is a side view showing the knife closed, a portion of the movable half
handle being removed to show the notches.
Figure 2 is a similar view but with the movable half handle opened out to its
extreme position before acting on the blade to open it.
Figure 3 is a side view of the knife in its opened condition but not locked by the
fastener.

page_text: Figure 4 views of the blade showing the position the stud projections occupy on
same.
Figure 5 is a sectional view showing clearly the spring and catch for locking the
fastener.
A is the blade having two stud projections B, C, one on each side, and which
blade A is pivoted to the two half handles D, E, at F.
G, H, are the notches in the fixed half handle, and I, J, the notches in the
movable half handle, and into which the stud projections B, C, engage according
to whether the knife be open or closed.
K is the fastener, one end L of which forms a false butt, while the other end
engages in the other butt for fixing the knife in the position required.
M is a catch acted on by a spring N engaging the end of the fastener for
locking it.
To open the knife, supposing it to be closed and locked, the catch M is moved
out of engagement with the fastener by pressing on the head, and the false butt L
is pulled out to remove the end of the fastener away from the catch, the movable
half handle is then turned to the position indicated by Figure 2 during which
movement the notch J has left the stud projection B, and the notch I engages with
the projection B a further movement of the half handle E forces the blade round
with it to be fully opened out, the projection C during this movement leaving the
notch H and engaging in the notch G.
The half handle E is now closed and the blade opened, and by pressing the false
butt Lin, the fastener engages with the catch M which locks it, the knife blade
being firmly fixed by the stud projections engaging in the notches I, G.
To close the knife the fastener has only to be unlocked, and the half handle E
moved in a reverse manner to that above set forth for opening the knife, the blade
being firmly locked in a closed condition, the stud projections engaging with the
notches J, H.
I have described and illustrated a spring catch for locking the fastener but any
other kind of catch may be employed, or the catch can be dispensed with.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what
claim is :-
1. The construction of puzzle pocket knife substantially as herein before
described and shown by the annexed drawings.
2. In a puzzle pocket knife notching the two half handles and providing the
blade with stud projections in the manner set forth and for the purposes
described.
The 16th d
1000
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said William James Harris.