Year: 1887

page_text: Date of Application, 22nd June, 1887
Complete Left, 20th Mar., 1888
Complete Accepted, 25th May, 1888
I, FRANZ CARL BELLINGER, of Fulda, Germany, Hardware Manufacturer, do hereby
declare the nature of this invention to be as follows:-
My invention relates to the joining or uniting of metal plates. Contiguous iron and
metallic plates can be connected with each other either by soldering, rivetting or folding.
Each of these modes of joining plates has its special disadvantages. Soldered plates
cannot be enamelled, and the scam shows little resistive power, rivetted plates do not
on account of the projecting heads, show an advantageous exterior, folded plates have
very thick folding edges.
According to this invention a joint of the plates is produced, in which the aforesaid
disadvantages are completely removed. This joint is produced by punching at right
angles to the edge of one plate or in the same direction therewith, elongated slits,
and at the other plate edge rectangular, trapeziform half-round or similarly shaped
laps are bent up, which are inserted in the slits of the former plate then bent round,
whereupon the laps of one plate are pressed into the other plate by rolling, so that a
narrow fold-like flat pad of a thickness equal to two thicknesses of plate is produced,
which is free from any kind of projections or depressions on its surfaces which more-
over exhibits a very great resistive power against separation, and is on one side of the
plate quite smooth, upon the other, only a little raised, and can be finally tinned and
enamelled without difficulty.
In one form of the said invention the edge of one of the plates contains at certain
distances apart narrow slits the width of which is not larger than the thickness of plate,
and the length of which must be chosen according to the width of the joint to be made.
The edge of the second plate is formed with angular incisions at the same distance
apart as the slits in the first plate and the laps thereby produced are bent up at right
angles to said plate. These laps are then inserted in the slips of the first plate after
which they are bent back into their original positions as far as possible.
The projecting laps are now pressed into the first plate by rolling over the seam
which is easily accomplished because in the second plate exist the corresponding holes
caused by the bent-up laps on said plate the result being a flat pad in which there

page_text: are no longer any protrusions and the thickness of plate is everywhere only that of
two single plates. The shape of the lap bent up rectangularly can be varied at will. They
may be trapeziform laps rectangularly two-sided laps which are bent up to the right
and left of the slit, and fit into corresponding slits in the first plate, the shape of the
laps can be varied according to requirements.
Instead of making the slits perpendicular they may be made parallel with the
edge of the first plate. In this case the corresponding laps are accordingly bent up
parallel to the edge of the second plate. In consequence of this the laps can also
receive a triangular or arch shape, which especially facilitates their introduction into
the first plate, further modifications of shape are also here very easily made.
This latter mode of joining, with slits running parallel with the plate edge, possesses
the advantage that on the plate, the edge is not interrupted by incisions, from which
results a somewhat increase.l strength of joint.
Dated this 22nd day of June 1887
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements relating to the Joining or Uniting of Metal Plates.
I, FRANZ CARL BELLINGER, of Fulda, in the Empire of Germany, Hardware Manu-
facturer, 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 the joining or uniting of metal plates.
Contiguous iron and metallic plates can be connected with each other either by
soldering, rivetting or folding. Each of these modes of joining plates has its special
disadvantages. Soldered plates cannot be enamelled, and the seam shows little resistive
power, rivetted plates do not on account of the projecting heads show an advantageous
exterior, folded plates have very thick folding edges.
According to this invention a joint of the plates is produced, in which the afore-
said disadvantages are completely removed. This joint is produced by punching at
right angles to the edge of one plate or in the same direction therewith, elongated
slits, and at the other plate edge rectangular, trapeziform, half-round or similarly
shaped laps are bent up, which are inserted in the slits of the former plate, then bent
round, whereupon the laps of one plate are pressed into the other plate by rolling, so
that a narrow fold-like flat pad of a thickness equal to two thicknesses of plate is
produced, which is free from any kind of projections or depressions which moreover
exhibits a very great resistive power against separation, and is on one side of the plate
quite smooth, upon the other, only a little raised, and can be finally tinned and
enamelled without difficulty.
In the accompanying drawing the Figures of which are hereinafter referred to,
several forms or modifications of my invention are shown.
b
In the form or modification of my invention shown in Figure 1 the edge of the
plate a contains at certain distances apart narrow slits, the width of which is not
larger than the thickness of plate, and the length of which must be chosen according
to the width of the joint to be made. The edge of the second plate 6 Figure 2 is
formed with angular incisions at the same distance apart as the slits in the first
plate a, and the laps c thereby produced are bent up at right angles to said plate as
shown in Figure 3. These laps c are then inserted in the slits of the first plate a
Figure 4 after which they are bent back into their original positions as far as possible
see Figure 4b.
The projecting laps c are now pressed into the first plate a by rolling over the
seam, Figure 4°, which is easily accomplished because in the second plate b exist the
corresponding holes caused by the bent-up laps c on the said plate the result being a
flat pad of the section shown in Figure 4° in which there are no longer any protrusions,
and the thickness of plate is everywhere equal to that of two single plates. The
shape of the lap bent up rectangularly can be varied at will. Figure 5 shows

page_text: trapeziform laps, Figure 6 rectangularly two-sided laps, which are bent up to the
right and left of the slit, and fit into corresponding slits in the first plate a; the shape
of the laps can be varied according to requirements.
Figure 7 shows a modification in which the slitse of the plate a are not perpen-
dicular to the plate edge but parallel therewith the corresponding laps d Figure 8
are accordingly bent up parallel to the edge of the plate b. In consequence of this
the laps can also receive a triangular or arch-shape, which especially facilitates their
introduction into the plate a; further modifications of shape are also here very easily
made.
Figures 9 and 10 show views of the joint corresponding to Figures 3 and 4. This
latter mode of joining, with slits running parallel with the plate edge, possesses the
advantage that on the plate b the edge is not interrupted by incisions, from which
results a somewhat increased strength of joint.
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 :-
In a joint for plates of metal or the like, produced by slits of one plate running in
proximity to the edge of said plate, perpendicularly parallelly or obliquely to the said
edge, and laps of the other plate, bent up perpendicularly, parallelly or obliquely to
the plate edge, the laps being moreover, after the insertion in the slits, bent back
again into their original position, and the joint compressed by rolling or pressing into
a flat pad of a thickness equal to two thicknesses of plate as above described.
Dated this 20th day of March 1888.