Improvements in Corner Fastenings for Cardboard Boxes, Wooden Frames, and similar articles.
Year: 1890

page_text: Date of Application, 30th Sept., 1890
Complete Specification Left, 19th Nov., 1890-Accepted, 11th Apr., 1891
PROVISIONAL SPECIFICATION
Improvements in Corner Fastenings for Cardboard Boxes, Wooden
Frames, and similar articles.
A communication from abroad by the Actien-Gesellschaft für Cartonnagen-
Industrie, of Loschwitz, near Dresden, in the Kingdom of Saxony and German
Empire, Manufacturers.
I, JOHN CORRY FELL, of the firm of Fell & Wilding, of 1, Queen Victoria
Street, in the City of London, Patent Agent, do hereby declare the nature of this
invention to be as follows:-
This invention relates to cramps to be used for connecting the edges of boxes and
similar articles of inferior or thin material of little durability.
The cramp is made of a piece of sheet metal strip, having oblique cuts corre-
sponding to the desired serrations or teeth.
The pieces formed by these cuts are bent downwards where they are connected
to the metal strip, so that the angular teeth form with the surface of the sheet
metal strip an angle of less than 90 degrees. The sheet metal strip is further bent
longitudinally, so that the teeth of one side are brought into a position converging
from the teeth of the opposite side.
It is therefore a peculiarity of the cramp that the faces of the teeth of the
cramp are transverse to the longitudinal axis of the sheet metal strip.
The cramps are attached to the edges to be connected by means of a die
which presses the points of the teeth of the cramp into the side of the box and
at the same time brings the sides of the cramp into a position corresponding to
the angle of the box.
While the teeth are entering the side of the box the angle between the teeth
and the face of the cramp is further reduced by the resistance of the material
into which the teeth are entering so that when the connection has been made
the teeth remain within the side of the box and the fastening can therefore
not be seen inside the box except perhaps by traces.
The cuttings made by the teeth into the side of the box are therefore parallel
to one another and not in one line so as not to endanger the durability of the
material.
If the material used for the boxes offers considerable resistance to the teeth,
the cuts in the sheet metal strip may be rectangular to the edge of the latter
and both corners bordering the cut may be bent to as to form teeth of an angle
of less than 90 degrees, and also transverse to the longitudinal axis of the cramp.
Dated this 30th day of September 1890.
FELL & WILDING,
1. Queen Victoria Street, London, E.C., Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Corner Fastenings for Cardboard Boxes, Wooden
Frames, and similar articles.
A communication from abroad by the Actien-Gesellschaft für Cartonnagen-
Industrie, of Loschwitz, near Dresden, in the Kingdom of Saxony and German
Empire, Manufacturers.
I, JOHN CORRY FELL, of the firm of Fell & Wilding, of 1, Queen Victoria
Street, in the City of London, Patent Agent, 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 relates to cramps to be used for connecting the edges of boxes
and similar articles of inferior, or thin material of little durability.
The cramps described in British Letters Patent No. 8590 of 1885 have some-
times proved to be unsuitable for connecting the edges or surfaces of boxes and
similar articles of inferior or thin material of little durability, such as straw-
boards, particularly where the nature of the material allowed of very small
intermediate spaces between the teeth of the cramp. In such cases the material
between the teeth of the cramp was easily torn.
To avoid this disadvantage the following improvements have been designed.
In order that my invention may be the better understood, I now proceed to
describe the same in relation to the accompanying drawings, reference being had
to the letters and figures marked thereon.
Figure 1 shows the sheet metal strip a from which the cramp is made and
which has oblique cuts a¹ at distances corresponding to the desired distance
between the teeth of the cramp.
The corners formed by these cuts are bent downwards at a right angle to the
longitudinal axis of the strip so far that the teeth formed thereby form an
angle with the lower surface of the strip of less than 90° (see Figure 2). The
sheet metal strip is also bent in its longitudinal direction which brings the opposite
teeth into a converging position to one another as shown in a transverse sectional
view (Figure 3).
This improved cramp therefore differs from that described in the British Specifi-
cation No. 8,590 of 1885 by the faces of the teeth in the latter being in the
longitudinal direction of the strip while in the former they are transverse to the
same.
a
These improved cramps are attached to the edges to be connected in the same
manner as described in the aforesaid Specification No. 8,590 of 1885 by means of
die which drives the points of the teeth into the sides of the box and at the same
time bends the sides of the cramp to an angle corresponding to that of the desired
box.
While the teeth are entering the material the resistance of the latter reduces the
angle formed by the teeth and the lower face of the cramp, so that when the con-
nection has been made, the points of the teeth are entirely in the sides of the box
and do not, therefore show any marks, or at most only very slight marks inside the
box.
Figures 5 & 6 show a double-size section and longitudinal section respectively of
the connection.
Figure 4 is a side elevation of the cramp after the connection has been effected,
and it will be seen that the cuts made by the teeth into the material are parallel to
one another and not in one line as in the aforesaid Specification No. 8,590 of 1885.
The durability of the material between the teeth is therefore not affected, or only
to a very small extent.
This cramp may also be used for connecting flat surfaces. In this case it is

page_text: desirable to bend the sheet metal strip concavely (see Figure 7). The cuts in the
sheet metal strip may also be at right angles to the edges of the latter (see Figure 8.)
and both corners formed by such cuts may be bent over as before to form teeth b¹
also transversely to the longitudinal axis of the cramp (see Figure 9). This modifi-
cation however is only advantageous where material of some durability is used.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In a cramp or joint as protected by British Letters Patent No. 8,590 of 1885 the
modified formation of the teeth 66 transversely to the longitudinal axis of the
cramp to allow of such cramps being used with greater advantage for articles of
material of slight durability.
Dated this 19th day of November 1800
FELL & WILDING,
1, Queen Victoria Street, London, E.C., Agents for the Applicant.