A Machine or Apparatus for Opening Hermetically Sealed and other Closed Tins.
Year: 1899

page_text: Date of Application, 3rd Nov., 1899-Accepted, 6th Jan., 1900
COMPLETE SPECIFICATION.
A Machine or Apparatus for Opening Hermetically Sealed and other
Closed Tins.
I, ADOLF VON DER NAHMER, of 3A, Kippdorfstrasse, Remscheid, in the German
Empire, Director of the Firm of Alexanderwerk A. von der Nahmer, of the
same address, 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:-
My invention relates to a machine or apparatus for opening hermetically and
other closed tins, the object of which are quickness in action and to avoid the
accidents that frequently occur by the use of the small hand tools hitherto
employed for this purpose.
The accompanying drawings are illustrations of my said invention Figs. 1
and 2 being side elevations taken at right angles to each other while, Fig. 3
is a plan and part sectional view of same.
Figs. 4 and 5 are details of the action of the cutting knife and hereinafter
explained.
My invention consists of a suitably shaped base m which may be of metal or
other suitable material, upon which is mounted and fixed a preferably four
legged metallic or other stand #, the upper end of which is adapted to form a
bearing for a horizontal spindle o, the outer end of which carries a handle p
for rotating the same, while its inner end opens into a frame (mounted upon
or formed integrally with n) and carries a mitre wheels, in gear with a mitre
wheel mounted upon a vertical sliding rod e, adapted to be rotated in bear-
ings and formed by the frame r, the lower end of the said rode having
a centring point e, and carries an horizontal arm upon which is mounted an
adjustable sliding collar, carrying a knife or knife edged tool g.
The base m carries a right and left hand threaded screw y, adapted to be
rotated by the means of a handle within bearings formed in the said base,
and upon the said screw is mounted a pair of internally threaded jaws a and b,
preferably concave upon their inner and meeting surfaces.
The tin X to be opened (represented by dotted outline in Figs. 1, 2 and 3,
and by full lines in Fig. 5) would be placed upon the base m, and would be
immediately centred between and firmly gripped by the jaws ab when brought
towards each other by the rotation of the screw y. If now the slotted rod e be
forced downward by the left hand of the operator pressing upon the knob f,
its point would take into the centre tin X, thus permitting the adjustment
of the collare upon the rod or arm to describe the circle desired, when a
slight blow or extra pressure by the same hand imparted to the said rod e would
cause the point of the knife g to enter the tin X, when the said knife would,
by the rotation of the handle p, be caused to travel around the upper end
of X, and produce an annular cut therein, so that the circular portion thus
severed therefrom may be removed and the contents of the tin be emptied when
released from the grip of the jaws a b.

page_text: In order that the hand may not be injured by the sharp or harass edge left
upon the tin after the said cut has been made, I construct the knife abnor-
mally thick upon its back face k, which provides, that from its cutting edge i
to the back the side faces of the blade are oblique, as shewn by Fig. 4, and
for preference the knife is also fixed obliquely in the collar a so that the inner
side, of the said blade is in alignment with the cut being made in the vessel X
as shewn in Fig. 5, and by the means of a cut or slot formed in the opposite
side of the said blade, which embraces the edge left upon the vessel, the said
edge is thereby turned downward and under as the knife travels and the cut
is made, as illustrated by Fig. 5.
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:
-
1st. The machine or apparatus for opening sealed and other tins substantially
as herein described and shewn.
2nd. In a machine or apparatus for opening sealed and other tins, the combi-
nation of a base m supporting a stand n the upper end of which is arranged
to provide a frame adapted to form a bearing for a spindle O, rotated by a
handle and carrying a mitre wheels gearing with a like wheel upon a
rod e, adapted to be rotated by a wheel t, and to slide vertically through bear-
ings and d, the upper end of e having a hand hold or knob f while its lower
end carries a centring pin and arm w, the latter carrying an adjustable
collar provided with a cutting blade g, the tin X being operated upon being
held in position between jaws a and actuated by a two way threaded spindle y
rotated by a handle substantially as herein set forth and shewn.
3rd. In combination with a machine or apparatus for opening sealed tins
characterized by the preceding claim, the employment of a blade g, having a
cutting edge and thickened back, with groove or recess for turning back
the harass edge of the tin after the opening cut is made, substantially as
herein described and shewn.
Dated this 3rd day of November 1899.
GEO. THOS. HYDE,
1, Broad Street Buildings, Liverpool Street, London, E.C.,
Agent for the Applicant.