Improvements in or relating to the Manufacture of Metallic Clamping Strips, Eyelets and the like.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to the Manufacture of Metallic Clamping
Strips, Eyelets and the like..
A part communication from EMIL SALTZKORN, Consul, of Dresden, in the Em-
pire of Germany.
I, LUDWIG NICOLAI, Mechanical Engineer, of 32, Loebtauerstrasse, Dresden,
in the Empire of Germany, temporarily residing at 23, Dulwich Road, Herne
Hill, in the County of Surrey, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in the manufacture of metallic clamp-
ing strips, eyelets and the likes and his particular reference to tools for
forming burrs or clinching projections on metallic strips or eyelets used for
reinforcing the corners of boxes.
The following is a description, by way of example, of one construction of
tool according to this invention, it being understood that various details may
be altered without departing from the spirit of the invention.
One
A base-plate is provided having guides, upon which a carrier can move.
set of dies is mounted upon the base-plate and another set upon the carrier,
the latter being moved in relation to the base in any convenient way, say in a
press or like apparatus.
The lower dies, that is those upon the base-plate, are in the form of a plate
having two or more series of holes in it arranged at a given distance apart. The
edges of the plate are scalloped or similarly shaped and preferably the curves
of the scallops are concentric with the holes in the plate.
Attached to the carrier are the dies which co-operate with the lower dies
in forming the strips or eyelets. These upper dies may conveniently comprise
two sets, one set being in the form of two series of circular punches register-
ing with the holes in the lower die plate and the other set being in the form
of two plates arranged one on each side of the rows of punches, the edge of each
plate being shaped to correspond with the scalloped edge of the lower plate.
The punches, as above mentioned, are preferably circular in cross-section
and the point is so formed that it has four main cutting ribs, the space between
the ribs being concaved. Owing to the circular shape of the punch and to
the fact that there is a concavity between the cutting ribs; two other cutting
edges are formed at the upper boundary of each concavity joining the upper
extremities of the cutting ribs. Thus in a punch having four main cutting
ribs there are altogether twelve cutting edges. A punch of this description
when it operates upon a strip forms four large prongs at the back of the
strip each prong being in the form of an arrow head, that is to say, it is

page_text: slightly undercut. Adjacent to each large prong is a smaller prong, the edges
of which correspond with the undercut portions of its neighbour. This con-
struction ensures the proper bending of the prong and the clinching of the
strip to the box or other device to which it is attached.
Guide pins are provided at the ends of the rows of punches extending
beyond the latter and arranged to enter corresponding holes in the lower die
plate, before new holes are punched in the strip. These guide pins are so
situated that they will engage the strip by passing through the last holes
punched by the previous operation, so that a strip may be passed through the
machine and the holes punched by each operation will be equally spaced and in
line. This feature is of importance as the mechanism which feeds strips of
this character to, say, box-making machinery does so by engaging with the
holes and consequently it is of importance to have the latter regularly and
evenly spaced.
Between the upper and lower dies a "stripper" is placed, which is preferably
similar in shape to the punched strip, its function being to ensure the removal
of the strip from the upper dies or punches.
It is sometimes convenient to manufacture several strips side by side out
of one sheet of metal, and in this case the dies are preferably constructed with
longitudinal cutting edges or are otherwise modified so that the sheet is sheared
into strips and the holes in the latter punched by one operation.
Dated this 20th day of October 1899
BOULT, WADE & KILBURN,
Agents for the Applicant.
Improvements in or relating to the Manufacture of Metallic Clamping
Strips, Eyelets and the like.
A part communication from EMIL SALTZKORN, Consul, of Dresden, in the Em-
pire of Germany.
I, LUDWIG NICOLAR, Mechanical Engineer, of 32, Loebtauerstrasse, Dresden,
in the Empire of Germany, temporarily residing at 23, Dulwich Road, Herne
Hill, in the County of Surrey, 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 improvements in the manufacture of metallic clamp-
ing strips, eyelets and the like, and has particular reference to tools for
forming burrs or clinching projections on metallic strips or eyelets used for
reinforcing the corners of boxes.
The following is a description, by way of example, of one construction of
tool according to this invention, it being understood that various details may
be altered without departing from the spirit of the invention.
One
A base-plate is provided having guides, upon which a carrier can move.
set of dies is mounted upon the base-plate and another set upon the carrier,
the latter being moved in relation to the base in any convenient way, say in a
press or like apparatus.
The lower dies, that is those upon the base-plate, are in the form of a plate
having two or more series of holes in it arranged at a given distance apart. The

page_text: edges of the plate are scalloped or similarly shaped and preferably the curves
of the scallops are concentric with the holes in the plate.
Attached to the carrier are the dies which co-operate with the lower dies
in forming the strips or eyelets. These upper dies may conveniently comprise
two sets, one set being in the form of two series of circular punches register-
ing with the holes in the lower die plate and the other set being in the form
of two plates arranged one on each side of the rows of punches, the edge of each
plate being shaped to correspond with the scalloped edges of the lower plate
The punches, as above mentioned, are preferably circular in cross-section:
and the point is so formed that it has four main cutting ribs, the space between
the ribs being concaved. Owing to the circular shape of the punch and to
the fact that there is a concavity between the cutting ribs two other cutting
edges are formed at the upper boundary of each concavity joining the upper
extremities of the cutting ribs. Thus in a punch having four main cutting
ribs there are altogether twelve cutting edges. A punch of this description
when it operates upon a strip forms four large prongs at the back of the
strip each prong being in the form of an arrow head, that is to say, it is
slightly undercut. Adjacent to each large prong is a smaller prong, the edges
of which correspond with the undercut portions of its neighbour. This con-
struction ensures the proper bending of the prong and the clinching of the
strip to the box or other device to which it is attached.
Guide pins are provided at the ends of the rows of punches extending
beyond the latter and arranged to enter corresponding holes in the lower die
plate, before new holes are punched in the strip. These guide pins are so
situated that they will engage the strip by passing through the last holes
punched by the previous operation, so that a strip may be passed through the
machine and the holes punched by each operation will be equally spaced and in
line. This feature is of importance as the mechanism which feeds strips of
this character to, say, box-making machinery does so by engaging with the
holes and consequently it is of importance to have the latter regularly and
evenly spaced.
66
Between the upper and lower dies a stripper" is placed!, which is preferably
similar in shape to the punched strip, its function being to ensure the removal
of the strips from the upper dies or punches.
In the accompanying drawings,
Figure 1 is a side elevation partly in section of apparatus constructed accord-
ing to this invention.
Fig. 2 is an underside sectional plan on the line of Figure 1.
Figure 3 is a sectional plan on the line of Figure 1.
Figure 4 is an elevation of one of the punches shown in Figure 1 and drawn
to a larger scale.
Figure 5 is a section on the line 5-5 of Figure 4.
Figure 6 is another view of the punch shown in Figure 4.
Figure 7 is a section on the line 7-7 of Figure 6.
Figures 8 and 9 are respectively elevation and plan of a metallic strip punched
by apparatus constructed according to this invention, and
Figure 10 is an enlarged view of a portion of one of the eyelets of the
punched strip.
A base plate A is provided having guide rods A upon which a carrier B can
move. One set of dies is mounted upon the base plate A and another set
upon the carrier B, the latter being moved in relation to the base A by any con-
venient means, such as a press or like apparatus.
The lower die consists of a die plate Chaving two series of holes C¹ in it
arranged at a given distance apart. The edges of the die plate Care scalloped
or similarly shaped, the curves of the scallops being concentric with the holes C
as shown at C2, Figure 3.

page_text: The upper dies are secured to the carrier B and co-operate with the lower
die in forming the strips or eyelets. These upper dies comprise two sets, one
set consisting of two series of circular punches 1) registering with the holes C¹
in the lower plate C, and the other set consisting of two die plates E arranged
one on each side of the rows.of punches, the inner edges of the die plates E
being shaped at E to correspond with the scalloped edges C2 of the plate C.
The punches D are cylindrical and are provided with tapered ends having faces
thereon. In the example illustrated in Figures 4 to 7 the tapered end of the
punch is provided with four faces 11 thus forming four cutting edges I).
The faces Dare hollowed and form, with the cylindrical surface of the punch,
two additional cutting edges D for each edge D². Thus in a punch having
four faces D there are altogether twelve cutting edges.
Guide pins F are provided at one end of the rows of punches I) and extend
beyond the latter: these pins F are arranged to enter corresponding holes F¹ in
the plate C before the punches act upon a metal strip. The guide pins Fare
so situated that they will engage the strip G (Figures 8 and 9) by passing
through the last holes punched by the previous operation, so that when a strip is
passed through the machine the holes punched by each operation will be equally
spaced and in line. This feature is of importance as the mechanism which
feeds strips of this character to, say, box making machinery does so by engaging
with the holes and consequently it is of importance to have the latter regularly
and evenly spaced.
A stripper H is placed between the upper and lower dies and is secured to
the guide rods A by suitable bolts or the like. This stripper is preferably
similar in shape to the punched strip, being scalloped at each side so as to ensure
the removal of the strip from the upper dies or punches after being punched.
In operation the strip to be punched is fed from the left hand end of the
machine shown in Figures 1. 2 & 3 between the plate C and the stripper H. The
upper dies are then moved down so that holes are punched in the strip G
and the edges scalloped as shown in Figure 9. Punches provided with four
faces will form four projections G (Figure 10) for each hole punched.
Owing to the provision of the cutting edges D³, these projections G₁ will be
undercut at their base, small additional projections G being formed by the
undercutting operation. This construction of eyelet ensures the proper bending
of the projections and the clinching of the strip to the box or other device
to which it is attached.
It is sometimes convenient to manufacture several strips side by side out of
one sheet of metal, and in this case the dies are preferably constructed with
longitudinal cutting edges or are otherwise modified so that the sheet is sheared
into strips and the holes in the latter punched by one operation.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me in part by my foreign correspondent, and
claim is
in what manner the same is to be performed, I declare that what
I. In a punch the combination with tapered faces D₁ of cutting edges such as D³
substantially as and for the purpose described.
2. In apparatus for the manufacture of clamping strips eyelets or the like a
cylindrical punch having a tapered end with hollow faces thereon substantially
as and for the purpose described.
3. In apparatus for the manufacture of clamping strips or the like the com-
bination of a lower die plate such as C having cylindrical holes and scalloped
edges two upper die plates such as E correspondingly scalloped at their inner
edges and cylindrical punches such as I moving with the upper die plates with
or without a stripper such as H substantially as described.
4. In apparatus for the manufacture of clamping strips or the like the com-
bination with upper and lower die plates such as E and C and punches such as I)
moving with the upper die plates of guide pins such as F extending beyond The

page_text: punches and engaging holes in the die plate C substantially as and for the
purpose described.
5. The complete apparatus for the manufacture of clamping strips eyelets or
the like substantially as described or illustrated in the accompanying drawings.
Dated this 16th day of August 1900.
LUDWIG NICOLAI.
EMIL SALTZKORN.
Boult, Wade & Kilburn,
Agents for the Applicant.