Safety-fuze for Exploding Petards.
Year: 1890

page_text: Date of Application, 23rd Sept., 1890
Complete Specification Left, 20th May, 1891-Accepted, 20th June, 1891
PROVISIONAL SPECIFICATION.
Safety-fuze for Exploding Petards.
I, WILHELM NORRES of Schalke in the Province of Westphalia Kingdom of
Prussia, German Empire, Wages-list-keeper on the Consolidation Mine do hereby
declare the nature of this invention to be as follows:-
My invention relates to a novel device for exploding petards by mechanical force
without the use of fire, and I attain that object by the mechanism illustrated in the
accompanying drawing, in which :
a is a small tube provided with a bottom e and a lateral opening f,
bis a piece of elastic wire provided with an car g at its one end, and with a
hook d at the other,
•
c is a primer contained within the tube near the bottom,
d is a hook forming one end of the elastic wire b.
The elastic wire b enters the tube a through a hole h bored into the bottom e of
the tube, and leaves it through a lateral opening f, and is bent at this point as a
hook d. A primer c is fastened to the wire b near the bottom e of tube a leaving á
small space between itself and the bottom e.
After having put the powder into the blast-hole, the fuze is placed upon the
powder and a cordon of sufficient length secured to the eary of the wire b. The
blast-hole is closed then in the usual manner. When pulling now at the wire by
means of said cordon, the hook d will be forced out of the lateral opening f, and, in
consequence of its elasticity will regain its hook-form instantly after having left
the opening f. By the force of pulling, the hook is pushed on the primer c with
rapidity, thus exploding the primer and thereby the powder, too. When using
petards, the safety-fuze must be attached to them before placing them into the
blast-hole.
Dated this 18th day of September 1890.
WILHELM NUKKES.
By F. Bosshardt & Co.,
Agents to Applicant.
COMPLETE SPECIFICATION.
Safety-fuze for Exploding Petards.
I, WILHELM NORRES, of Schalke, in the Province of Westphalia, Kingdom of
Prussia, German Empire, Wages-list-keeper in the Consolidation Mine, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
My invention relates to a new fuze for exploding petards, and the object of the
same is, to be able to set the shot without applying fire from outside, but merely by
mechanical means. I arrive at this object by providing the fuze with a long wire
of such a shape, that by a violent pull the percussion match or primer will be struck,
so as to ignite and set the shot agoing.
In order to make my invention more clear I refer to the drawing, sent in with
Provisional Specification, in which the shell of the fuze consists of the tube a and
the disc e. At about half way of its length the tube a has a hole and the disc
also has a hole h. By this latter a wire b is inserted into the fuze, being on its end
bent to a hook d, which catches in the lateral hole f. Unto the wire there is the
primer or percussion-match attached inside of the shell and close to the covering

page_text: disc e.
The other free end of the wire bends out into an eye g, so as to permit a
cord to be knotted thereto. In case the blasting-substance is to be dynamite or the
like a priming-cap is put in the open end of the shell, this however is not necessary
for gun- or blasting-powder.
Now the shot is prepared in this manner:
Firstly the blast-hole is filled in with the powder or other suitable explosive
substance, then the fuze, being adjusted in the aforesaid way, is laid on the
powder, the eye of the wire sticking out, and a cord, having such a length, as may
be required to set the shot from a considerable distance, is tied unto the said eye of
the wire, and finally the hole is tamped in the usual manner.
Now the operator,
standing at a distance, may give a violent pull on the cord. The hook & giving
way to the pull, is drawn out of the hole fand, thereby becoming the shape of an
angle, strikes against the primer or percussion match. By the suddenness of the
stroke the primer ignites and the shot goes off. When making use of a ready made
petard the same is inserted into the blast-hole combined with the safety-fuze and is
operated upon in the same manner as before.
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
A safety-fuze for exploding petards, consisting of a shell (a e), in combination
with a wire (b) carrying a primer (c) inside of said shell, and being attached to the
fuze by a hook, placed in a side-hole of the shell from inside out, the other end of
the wire extending out through the closed end of the shell and being adapted to
permit a cord to be tied thereto, as for the purpose set forth.
Dal 101 1
1001
WILHELM NORRES.
By F. Bosshardt & Co.,
4, Corporation Street, Manchester, Agents for the Applicant.