Improvements in and relating to the Cutting of Nail-blanks from Metal Bars or Strips.
Year: 1891

page_text: Date of Application, 16th Oct., 1891
Complete Specification Left, 23rd Feb., 1892-Accepted, 26th Mar., 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by JOHANN HEINRICH EHLERS, of Bahrenfeld,
in the Province of Schleswig-Holstein, in the Empire of Germany, Manu-
facturer.]
Improvements in and relating to the Cutting of Nail-blanks from
Metal Bars or Strips.
HENRY HARRIS LAKE of the firm of Haseltine Lake & Co. Patent Agents
of 45 Southampton Buildings in the County of Middlesex do hereby declare the
nature of this invention to be as follows:-—
This invention relates to improvements in the method of cutting-out or stamping
mail-blanks from metal strips or bars, in which the latter are operated upon by
suitable cutting-knives or dies, while the back of the comb like blank so produced
forming the shaft of the nail-blauks is severed by a separate knife into a second
series of single nail blanks.
According to the present invention the cutting of the metal bars or strips is
performed simultaneously by two dies or knives arranged side by side in such a
manner that at each stroke of the knives a tooth or blank is formed the free end
of which having the form of the head of a nail-blank while the part which remains
attached to the back of the comb-like piece has about the width of the shafts of
three nail-blanks. Out of this wide piece or tooth a nail blank is cut by the
second knife or die during the succeeding stroke, when the bar has advanced a
distance equal to the breadth. of the head of two nail-blanks. These knives or
dies have a distance equal to the double breadth of the head of a nail blank
between them that is to say, the pitch of the knives or the distance of their centre
lines being three times the breadth of a nail-head or one and a half times of the
feed motion of the metal bar or blank at each stroke. A third knife is arranged
backward in relation to the direction of the feed motion of the bar. The distance
of the centre line of this knife from that of the preceding one is equal to two and
a half times the breadth of a nail-blank or one and a quarter of the stroke of the
intermittent feed motion of the bar. This third knife is designed to stamp out
each time the second nail-blank from the end of the dentated bar by severing its
head from that of the two adjoining blanks, so that at each stroke two nail blanks
are cut off by the said third knife from the dentated part of the bar. Thus under
the conjoined action of the said three knives four nail-blanks are simultaneously
cut out from the bar and thereby the double quantity of nails produced within the
same time as heretofore performed by the same class of stamping or punching
machines having a to-and-fro moving chuck for the reception of the cutting-dies.
Notwithstanding of the increased out-put the speed of the machine employed needs
not at all to be increased.
On
The first knife which comes into action has the form of, and is designed to stamp
out a nail blank from the metal-bar thus forming an interstice in the latter.
the receding of the knives the metal bar is advanced a distance equal to the width
of two nail-heads, so that on the second downward motion of the knives a nail
blank is cut out by the knife from the bar, thus producing a second interstice in
the latter. While however in the first phase of the cutting process a tooth or
prong forming only a fraction of a nail-blank is maintained in the rectangularly
cut-off metal-bar, in the second phase a broad tooth or prong lying between the
interstices is produced. Out of this tooth or prong in the third phase of the
cutting process a nail-blank is cut out by the second knife or die and thereby an
intersection formed, while the knife at a distance of three nail-heads in advance
cuts out a nail blank whereby an interstice and another tooth or prong is produced

page_text: in the metal-bar. The knives which may be received in the same chuck of the
reciprocating slide of a stamping machine are of congruent size and arranged
parallel to each other with their head-end directed towards the same edge of the
metal-bar.
In the fourth phase of the cutting process, when the metal-bar is advanced by
the feeding device a distance equal to the breadth of two nail-heads the knife or
die cuts out a nail-blank while forming a tooth or prong and an interstice. The
second knife, which at the beginning of the action of the first knife stands above
the tooth is simultaneously caused to stamp out of the latter a nail-blank, thereby
leaving an interstice in the tooth, while the third knife is fit to sever a nail-blank
from the cohering part of the adjoining teeth of the metal bar. As the bottom die
or matrice cooperating with the third knife is of a form corresponding with the
latter, the tooth when severed from the nail-blank is maintained as a nail-blank on
top of the matrice and carried forward on the feed motion of the metal-bar. In
this case the nail-blank is still imperfect, but on the subsequent action of the
kuives all nail-blanks cut off by the same will be in a perfect condition. On the
downward motion of the knives the first one cuts out a nail-blank from the solid
part of the metal-bar, the second knife separates the tooth into the two adjoining
teeth while stamping out the nail-blank and the third knife is caused to sever the
tooth from the adjoining ones, thereby producing the nail-blanks. The four nail-
blanks thus produced on each stroke of the three knives are now of regular form
and the metal-bar may in this manner be entirely cut into nail-blanks without any
waste, with the exception of the end-pieces, which in most cases only form fractions
of a nail-blank.
Dated this 16th day of October 1891
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to the Cutting of Nail-blanks from
Metal Bars or Strips.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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 improvements in the method of cutting out or stamping
nail-blanks from metal strips or bars, in which the latter are operated upon by
suitable cutting-knives or dies, while the back of the comb-like blank so produced
forming the head of the nail-blanks, is severed by a separate knive into a second
series of single nail-blanks.
According to my present invention the cutting of the metal bars or strips is
performed simultaneously by two dies or knives arranged side by side in such a
manner, that at each stroke of the knives a tooth or blank is formed the free end
of which has the form of the head of a nail-blank, while the part which remains
-attached to the back of the comb like piece is about the width of the shafts-of
three nail-blanks. Out of this wide piece or tooth a nail-blank is cut by the second
knife or die during the succeeding stroke, when the bar has advanced a distance
equal to the breadth of the head of two nail-blanks. These knives or dies
have a distance equal to the double breadth of the head of a nail-blank,
between them, that is to say, the pitch of the knives or the distance apart of their
centre lines are three times the breadth of a nail-head or one and a half times the
feed motion of the metal bar or blank at each stroke. A third knife is arranged
backward in relation to the direction of the feed motion of the bar. The distance
'

page_text: of the centre-line of this knife from that of the preceding one is equal to two and
a half times the breadth of a nail blank or one and a quarter the stroke of the
intermittent feed motion of the bar. This third knife is designed to stamp out
each time, the second nail-blank from the end of the dentated bar by severing its
head from that of the two adjoining blanks, so that at each stroke two nail blanks
are cut off by the said third knife from the dentated part of the bar. Thus under
the combined action of the said three knives four nail-blanks are simultaneously cut
out from the bar and thereby a double quantity of nails is produced within the same
time as heretofore performed by the same class of stamping or punching machines
baving a to-and-fro moving chuck for the reception of the cutting dies. Notwith-
standing the increased out-put the speed of the machine employed need not be
increased.
In the accompanying drawing I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figures 1 to 4 show diagrams of four phases of the improved process which would
arise when starting from the feeding point, the three knives or dies comes con-
secutively into action.
Figures 1 to 4 illustrate the dentations of the metal bar from which the nail
blanks are cut and,
Figure 5 is a diagram showing the action of the three knives in the further
progress of the cutting or stamping process.
Similar letters refer to similar parts throughout the several diagrams.
The first knife A which comes into action has the form of, and is designed to
stamp out a nail-blank a' (shown by dotted lines) from the metal-bar Ď, thus
forming an interstice I in the latter (Figure 1A). On the receding of the knives
the metal-bar is advanced a distance equal to the width of two nail-heads, so that
on the second downward motion of the knives a nail-blank a² (shown by dotted
lincs, Figure 2) is cut out by the knife A from the bar, thus producing a second
interstice 2 (Figure 2) in the latter. While however in the first phase of the
cutting process (Figures 1 and 1*) a tooth or prong & forming only a fraction of a
nail-blank is maintained in the rectangularly cut-off metal bar D in the second
phase (Figures 2 and 2) a brcad tooth or prong & lying between the interstices 1
and 2 is produced.
Out of this tooth or prong 62 in the third phase of the cutting process a nail-
blank a (shown in dotted lines Figure 3) is cut by the second knife or die B and
thereby an intersection 4 formed, while the knife A at a distance of three nail-
heads in advance cuts out a nail blank a³ (shown in dotted lines) whereby an inter-
stice 3 (Figure 3^) and another tooth or prong 63 is produced in the metal-bar.
The knives A and B which may be received in the same chuck of the recipro-
cating slide of a stamping machine are of congruent size and arranged parallel
to each other with their head end directed towards the same edge of the metal-
bar D.
In the fourth phase of the cutting process, when the metal bar is advanced by
the feeding device a distance equal to the breadth of two nail heads the knife or
die A cuts out a nail-blank A' while forming a tooth or prong 6 and an interstice 5.
The second knife B which at the beginning of the action of the knife A stands
above the tooth is simultaneously caused to stamp out of the latter a nail-blank a³,
thereby leaving an interstice 6 (Figure 4) in the tooth 6, while the third knife C
is about to sever a nail blank a' (Figures 4 and 4A) from the cohering part d of
the adjoining teeth 61 and 2 of the metal bar D.
As the bottom die or matrice co-operating with the third knife C is of a form
corresponding with the latter, the tooth b' when severed from the nail-blank a' is
maintained as a nail-blank as on top of the matrice and carried forward on the
feed motion of the metal bar D. In this case the nail-blank as is still imperfect,
but on the subsequent action of the knives all nail-blanks cut off by the same
will be in a perfect condition. This phasis is illustrated in Figure 5.
On the downward motion of the knives the first one A cuts out a nail-blank a

page_text: H
from the solid part of the metal bar, the second knife B separates the tooth b* into
the two adjoining teeth bb, while stamping out the nail-bank a10 and the knife C
is caused to sever the tooth from the adjoining ones 63, and 63, thereby producing
the nail-blanks a¹¹ and a". The four nail-blanks thus produced on each stroke of
the three knives are now of regular form and the metal bar D may in this manner
be entirely cut into nail-blanks without any waste, with the exception of the end
pieces which in most cases only form a fraction of a nail-blank.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondent, I declare that what I claim is :-
The method of cutting-out or stamping nail-blanks from metal-strips or bars,
by forming nail-blanks while dentating the metal-bar or strip on one side through
the medium of two knives or cutting dies, and severing the remaining portion of
the comb-like metal-bar by a third knife or cutting-die co-operating simultaneously
with the former, so that at each stroke of the knives four nail-blanks are produced,
substantially as set forth.
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1003
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.