Improvements in Rivets or Staples Made of Sheet-metal, and in the Manufacture thereof.
Year: 1893

page_text: Date of Application, 30th Aug., 1893-Accepted, 11th Nov., 1893
COMPLETE SPECIFICATION.
Improvements in Rivets or Staples Made of Sheet-metal, and in
the Manufacture thereof.
I, JOSEF TEMLER, of Warsaw, in the Empire of Russia, and 30 to 34 Tabernacle
Street in the City of London, Manufacturer, 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 well known rivets of sheet metal
for uniting soft sheet like material such as card-board, leather and the like which
rivets have acute-angled teeth at the sides of the rivet head.
The metal of which such rivets are produced must necessarily be thin so as to
allow the bending over of the teeth when the rivet is used in connecting or joining
and consequently the teeth not infrequently bend whilst being driven through the
sheets plates or the like to be connected and this spoils the rivet.
The object of the present invention is to improve such metal rivets and their
manufacture so that such bending of the teeth is obviated without requiring the
rivets to be produced from thicker sheets of metal.
In ordinary rivets each tooth forms a plane triangle but according to this
invention each tooth a is either curved as shown in Figs. 1 to 3 and 4 to 6 or made
angular as shown in Figs. 7 to 9 and 10 to 12.
Such curve or angle makes the teeth a capable of greater resistance to pressure
acting longitudinally upon the same and teeth so shaped will therefore bend much
less readily when driven into the sheets or the like to be connected than would
flat teeth.
A further improvement has for its object to permit such rivets to be fed
mechanically to the place where they are to be applied and to prevent stoppages
in such mechanical feeding that take place when the heads of several rivets slip
one over the other.
To this end small lugs or projections bare formed between the teeth a on the
edges of the rivet heads and these project from the rivet head in the same
direction as the teeth.
The said projections & form bearing surfaces when the rivet heads are placed side
by side as illustrated in Fig. 13 and these bearing surfaces are high enough to
prevent one rivet head slipping over another when they, following one another, are
mechanically fed to the place where they are to be used.
For producing such improved rivets having a curve or bend in the teeth a and
lugs or projections & serving as bearing surfaces for their heads a new method is
used which in comparison with those heretofore in use for making sheet metal rivets
not only requires a less number of operations but also fewer and in part simpler
tools. For these reasons the new process is less costly and hence cheapens the
product i.e. the improved sheet metal rivet.
The blanks ordinarily required for making such sheet metal rivets usually are
round or polygonal pieces of metal on which are points or projections which
ultimately form the teeth.
These blanks have to be cut from sheets by means of specially made cutters or
dies of suitable form. For the new process blanks are used whose shape is shown
in Fig. 14 of the drawings namely rhombus and these can be cut with ordinary
metal shears.
From these rhomboidal pieces rivets of the kind shown in Figs. 1. to 6. and 7 to 12.
are produced in a single operation by driving the blank placed in proper position
into the die u by means of the plunger o both of appropriate shape the vertical
surfaces of the die being cylindrical or angular (prismatic) as may be required.

page_text: The corners of the rhombus which extend beyond the sunk part of the die are in
such operation struck up vertically and the points or corners forming the teeth a at
the same time receive their curve or angle in transverse section and the head is
also shaped to the required form by the end of the plunger acting in conjunction
with the bottom of the die.
The obtuse angles of the rhombus produce the lugs or projections b.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In rivets formed of sheet metal having teeth a formed at the edges of the
rivet-head, a curved or angular shape in transverse section imparted to the teeth a
and the lugs or projections b provided at the edges of the rivet-head and between
the teeth a for the purpose of making the teeth capable of greater resistance
when forced through the plates or sheets or the like to be connected and for the
purpose of preventing the rivets slipping. one over the other when placed in
succession.
2. The method or process for making such rivets from sheet metal which consists in
making the blanks of rhombus form (Fig. 14) and striking the corners up to form
the teeth a and lugs whilst at the same time giving the teeth their curved shape
(Figs. 1 to 3 and to 9) or their angular shape (Figs. 4 to 6 and 10 to 12) whilst
also giving proper shape to the rivet head.
3. Rivets made of sheet metal with points and lugs formed substantially as and.
for the purpose described.
Dated the 30th day of August 1893.
NEWNHAM BROWNE,
Agent for the Applicant.