Improvements in the Manufacture of Sheet Metal Cramps for Securing the Parts of Boxes Together.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Sheet Metal Cramps for
Securing the Parts of Boxes Together.
I, HEINRICH WOLLHEIM, of Villa Simmig, 344 Wilhelminen Strasse, Loschwitz-
Dresden, in the Kingdom of Saxony and German Empire, Gentleman, do hereby
declare the nature of this invention to be as follows:-
This invention relates to the method of and means for the manufacture of sheet
metal cramps (used for making connections between edges, corners and flat
surfaces of boxes of card board, leather, split wood etc.) and for making connections
therewith.
A sheet metal strip or ribbon is used, the width of which corresponds to the
length of cramps to be made. From this sheet metal strip are cut pieces corre-
sponding to the width of the finished cramps. Such a piece of sheet metal strip
is shaped into the form of the cramp desired and pressed directly upon the edges
or flat surfaces to be connected together. All these manipulations are effected by
one continued operation of the machine.
The plate on which the strip of sheet metal rests or is moved forwards is
provided with a cutting or shearing edge at its end. This shearing edge
corresponds with a second cutting or shearing edge, provided on a sleeve which
guides the working stamp or die of the machine. Both edges form a pair of
shears, which effects a serrated cut, if the finished cramp is to have teeth on its
edges for its attachment to the parts to be connected. The piece of sheet metal
strip, which has been cut off, descends simultaneously with the sleeve and stamp,
and comes into contact with a punch formed so as to correspond with the profile
of the finished cramp.
The lower working surface of the stamp is formed
similarly. When the piece of sheet metal strip has been thus shaped into the
form of cramp required, the sleeve and stamp receive a horizontal movement which
brings them and the cramp within reach of an anvil on which is placed the box or
article, the edges or walls of which are to be connected together. The sleeve and
stamp then descend again vertically until the sleeve comes into contact with the
card board box. The stamp descends then further by itself and presses the cramp
on the parts of the box to be united. The teeth of the cramp enter into the card
board during this action, and they may protrude at the opposite side. In the latter
case they are bent over by the resistance offered by the surface of the anvil. In
order to support the teeth so that the points thereof are bent over inwards, the
face of the anvil may be provided with plates resting on springs. In a modified
manner, the punch may be arranged so as to move sideways, in order to come
within the reach of the vertical movement of the sleeve and stamp. In this case
the latter devices do not move sideways.
If flat surface connections are to be effected by means of this sheet metal cramp,
the working faces of the various tools are correspondingly altered.
The various parts of the machine may be suitably operated by pulleys, discs
cams, slides or in any other manner.
The stamps or dies may be constructed so that teeth are stamped into the pieces
cut off from the sheet metal strip, to serve for the attachment of the sheet metal

page_text: cramps, either by themselves or jointly with the serrations or teeth before-
mentioned.
Doted this 26th day of November 1801
FELL & WILDING,
Agents for the Applicant.
.
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Improvements in the Manufacture of Sheet Metal Cramps for
Securing the Parts of Boxes Together.
I, HEINRICH WOLLHEIM of Villa Simmig 344 Wilhelminen Strasse Loschwitz-
Dresden, in the Kingdom of Saxony and German Empire, Gentleman, 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 the method of and means for the manufacture of sheet
metal cramps (used for making connections between edges, corners and flat surfaces
of boxes of card board, leather, split wood etc.) and making connections therewith.
A sheet metal strip or ribbon is used, the width of which corresponds to the
length of cramps to be made.
The object of this invention is to cut pieces from this sheet metal strip (which is
fed forwards as it is used up) corresponding to the width of the finished cramps,
so that the cut-off piece is simultaneously provided with teeth or serrations ;
further to transform the serrated piece into cramp shape and to press it on to the
edges or flat surfaces to be connected together.
In order that my invention may be the better understood, I now proceed to
describe the same, reference being had to the accompanying drawings and to the
letters and figures marked thereon.
Figure 1 is a vertical section of the machine,
Figure 2 is a vertical longitudinal section of the same
Figure 3 is a horizontal section upon the line I-I, Figure 2.
Figures 4 and 5 are details
Figure 6 shows the sheet metal cramp itself.
a a are the rollers feeding the sheet metal strip as it is used. These rollers are
operated by the eccentric m through a rod m', ratchet wheel feeding mechanism
and a pair of conical wheels. The strip of sheet metal may be wound on a bobbin,
like a paper roll for telegraphing purposes. is a slot in one half of the upper
part of the machine, which is constructed of two parts. Below the slot b, a
serrated shearing plate d is inserted into the cast iron body of the upper part.
The serrations of this shearing plate correspond to the teeth which the sheet metal
cramp is to receive.
e is a die or stamp for bending the cut-off sheet metal strip
and hammering it on the parts of the box to be united. The die e is guided
vertically by a slide or sleeve f with which it is connected by bolts f¹.
d' is a shearing plate corresponding to the shearing plate d to form a pair of
shears. It is situated in a sliding guide g, which is guided vertically in a recess g¹
of the cast iron body of the upper part of the machine and which surrounds the
slide dove-tail like, see Fig. 5. The two slides ƒ and g are operated by the
grooved cam discs mand n through the two angular levers 7 and 8 pivotting around
the axle q.
When the sheet metal strip is pushed through the slot b (which move-
ment is limited by the hooks h, the action of which will be explained hereinafter),
the two slides fg descend. The shearing plate strikes the sheet metal strip and
cuts therefrom a piece provided with serrations.
T
After the cutting off has been effected the die and shearing plate carry the
cut off piece to a punch i, (guided horizontally in a recess ) which has been

page_text: pushed forwards in the meantime. The working surface of this punch i corresponds
to the profile of the sheet metal cramp to be produced, so that the cut off piece of
the sheet metal strip is transformed by the punch i into the shape of a sheet metal
cramp, as illustrated in Figure 6. When this has been done, the punch i is with-
drawn and the die and shearing plate continue their descent until they strike the
anvil on which rests the card board box, the sides of which are to be united.
The die then continues to descend further by itself and presses the cramp on to the
card board box, the teeth of the cramp entering into the material of the box.
To facilitate this procedure it is advisable to construct the anvil k of a fixed
middle part and two side parts movable against spring pressure. The side parts
are somewhat higher, at the commencement of the operation, than the middle part;
they descend under the pressure of the die e and serve to guide the points of the
cramp teeth and compel the same to bend inwards.
It is necessary in the process described that the piece cut off from the sheet
metal strip adheres to the face of the die e. For this purpose are designed the
before mentioned hooks h, the number of which corresponds to the number of teeth
of the sheet metal cramps. The hooks are attached to a sliding guide 7, which
can move in a flat groove of the sliding guide g so far as the groove is longer than
the guide l. The hooks are in their lowest position at the commencement of the
descent, and are, in this position, so far away from the face of the die i, that the
sheet metal strip can be fed to the shafts of the hooks h. At this moment
there is a free space v above the guide 1, see Figure 2.
When the two sliding guides then descend, the guide is held by the pressure of
a bolt t, which is under the pressure of a spring t which can be regulated by a
screw t¹, and the free space between the face of the die e and the hooks
disappears so that the cut off piece of sheet metal strip is held between the hooks /
and the face of the die e. When this position is reached, the slide 9 takes with it
the guide and the hooks h, so long as the shearing plate d' descends. At the
ascent the bolt t under spring pressure comes again into action, so that the free
space v is formed again and the hooks are again away from the face of the
die e.
The movements of the guides belonging to the die e and shearing plate d, and
also the movement of the punch i is effected as before mentioned by the grooved
cam discs m n o which are fixed to the axle w.
In a modified manner the punch i is fixed in the machine and the disc m may be
used to move the three guides fg l sideways, so that they get into the vertical
plane of the anvil k which protrudes in this case. The heads of the guides are
then provided for the action of the levers with longer grooves, so that engagement
is ensured in spite of the side movement.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
-:
1st. An apparatus for the manufacture of serrated sheet metal cramps and for
pressing or hammering the cramps to edges or surfaces to be united, consisting
a) of a shearing plate shown movable by a guide g in combination with a corre-
spondingly serrated shearing plate d fixed to the frame of the machine in order to
cut off a serrated picce from a sheet metal strip at the descent of the shearing
plate d'; b) of a die e moved by the sleeve or guide f in combination with a punch i
in order to bend at the further descent of the shearing plate d¹ the cut off piece of
sheet metal strip into cramp shape; c) of an anvil k constructed of three parts, the
sides of which are movable against the middle part, in order to press or hammer, at
the further descent of the shearing plate and die, the sheet metal cramp on to the
box placed on the anvil k, the teeth of the cramps being guided for this purpose by
the sides of the anvil.
2nd. In the machine as claimed in Claim 1 the arrangement that the punch i at
the time of the further descent of the shearing plate di is withdrawn, or that the

page_text: die and shearing plate may be moved forwards instead, in order to get within reach
of the protruding anvil k.
3rd. In the machine as claimed hereinbefore the arrangement of hooks h which
are fixed to a guide 1, which is pressed by a bolt t under spring pressure against
the sides of the guide g operating the shearing plate d', in order to allow,
according to the progress of the operation, the pushing of the sheet metal strip
under the die and shearing plate and to hold the cut off piece to the shearing
plate.
Dated this 26th day of August 1895.
FELL & WILDING,
Agents for the Applicant.