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Патент USA US2409605

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Od. 15, 1.946. .
L. A. YQUNG
_
2,409,304V
METHOD 0F MANUFACTURING SAFETY RAZOR BLADÉS
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origml med Feb, 14, 1942
ÍNVENTOR.
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Oct. 15, 14946. l
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L. A. YoUNG '- '
2,409,604
METHOD oF MANUFACTURING SAFETY nAzon BLADES
original Filed Feb. 1,4, 1942
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Patented Oct. 15, 1946
2,409,604
UNITED STATES PATENT OFFICE
2,409,604
‘ METHOD OF MANUFACTURING SAFETY
‘
RAZOR BLADES
Leonard A. Young, Detroit, Mich.
Original application February 14, 1942, Serial No.
430,895. Divided and this application August
2, 1944, Serial No. 547,738
,
(Cl. 'Z6-104)
3 Claims.
1
2
Another object of the present invention is to
provide an improved method and/or apparatus for
producing safety razor blades of the foregoing
character in which the cutting edges of the
This invention relates to a method or process
and/or apparatus for manufacturing safety razor
blades. The present application is a division of
my co-pending application Serial No. 430,895,
filed February 14, 1942,
Y
Ul
One of the objects of the present invention is
to provide a method of manufacturing an im
proved safety razor blade of skeleton form and
of the double edge type formed from steel wire
of round or other cross section or from a rela
blades and the cross members or struts for in
terconnecting them are formed or fashioned
from a single piece of steel wire stock or from a
continuous length of flat ribbon-like stock.
Another object` of the present invention is to
10 provide an improved method and/or apparatus
tively flat or ribbon-like length or piece of steel
and having a pair of cutting members or edges
of either like size and formation, or one in which
one of the cutting members or edges is rela
tively thinner and more flexible than the other 15
skeleton type of safety razor blade in which the
cutting members or cutting edges thereof are
formed or provided in the stock during the step
cutting member or edge.
Another object of the invention is to provide
mate blade size, shape and contour.
for- shaping or forming the blade stock into a
of forming or shaping saidstock into the ulti
A further object of the present invention'is to
a method of manufacturing an improved‘safety
provide improved blades of the foregoing charac
ter which are capable of being manufactured ac
razor blade of skeleton form and of the double
edge type formed from steel wire or from rela 20 cording to the present method by quantity pro
tively flat ribbon-like steel stock, in which the
duction methods at relatively low cost due to the
blade is capable of fitting a standard safety razor
substantial savings in materials over previously
such, for example, as a "Gil1ette” type razor.
known “Gillette” types of safety razor blades in
Another object of the present invention is to
which solid blanks of steel were employed to make
provide a method of manufacturing an improved 25 the blades and from which blanks a consider
able quantity of the steel was removed by stamp
safety razor blade of skeleton form and of the
ing operations, such steel being entirely waste ma
double edge type formed from-steel wire which
is capable of ñtting the standard safety razor
terial.
`
'
Another object of the present invention is to
such, for example, as a “Gillette” type razor, and
one in which one of the cutting edges of the 30, provide an improved method and/or ‘apparatus
for manufacturing skeleton type blades of the
blade is relatively thinner and more flexible than
foregoing character either from steel _wire stock
the other cutting edge thereof. .
'
of round or other cross section or from relatively
A further object of the invention is to provide
a method of manufacturing an improved safety
flat ribbon-like lengths of steel‘stock, in which
rabor blade of the foregoing type having one 35j all of the stock is employed in the manufacture
ofthe blade with no waste of material dueto
relatively thick and stiff cutting edge and another
punching or stamping out operations resulting
relatively thinner and more flexible cutting edge
whereby` to .provide in one safety razor assembly
in useless scrap.
` ‘
'
"
`
A further .object of the invention is to provide
a relatively stiff cutting member for performing
the preliminary or “first-over" shavingor cut- 40` a method of manufacturing a safety razor blade
having a resilient body portion and a contoured
ting operation and a relatively thinner and more
cutting edge having a cross-sectional contour
flexible cutting member or edge for performing
comparable tothe cross-sectional contour of a
the .so-called “clean~up” or final shaving or cut
ting operation.
'
hollow ground blade. `
"
Another object of the invention is to provide an
Another object of the present invention is to 45
improved method for the manufacture of safe
provide an improved method of manufacturing
ty razor blades, in which a blank formed from
or producing improved safety razor blades of
steel wire stock or from a ribbon-like strip or
the foregoing character having 'hollow ground
blank of steel stock is utilized to form the out
cutting edges.
A further object of the present invention is to 50 line and the cutting edge or edges of the blade
and in which the cutting edge or edges are formed
provide an improved method and/or apparatus
only in‘the work-hardened surface of the steel
for producing safety razor baldes of the fore
wire and the blank formed therefrom.
.`
going character from steel wire stock of round
A further object of the present invention is to
or other cross section or from relatively dat or
ribbon-like strips of steel.Y
D 55 provide >an improved method of manufacturing
,
2,409,604
3
4
safety razor blades which provides a blade which
is economical to manufacture and one which is
also of superior performance in use.
Another object of the invention is to provide
an improved method of makin.Ct safety razor
ent invention and some of the apparatus for car
rying out said method.
Fig. 2 is a continuation of Fig. 1; the right
hand end of Fig. 1 and the left-hand end of Fig. 2
should be joined to show a continuous method or
blades in accordance with which each blade may
process. Separation of the method or process
into Figs. 1 and 2 was done so as to reduce the
be built up from a plurality of separate pieces
but by a process of manufacture which is con
tinuous or substantially continuous.
A further object of the present invention is to 10
provide an improved method of making safety
razor blades which eliminates waste of expensive
high-grade steel stock caused in conventional
methods by the steps of punching or piercing out
length of the figure which could not have been
placed in desirable scale on the drawings in a
single figure only.
Fig. 3 is an enlarged section taken substantially
along the line 3--3 of Fig. l, looking in the direc
tion of the arrows and showing the divided 0r
separated blade portions.
relatively large portions from the body of the 15
blade.
A further object of the present invention is
to provide improved apparatus with the aid of
which my improved method may be successfully
Fig. 4 is an enlarged transverse sectional view
taken substantially along the line d-f’i of Fig. 16,
looking in the direction of the arrows.
Fig. 5 is a plan view illustrating a part of an
other improved process or method embodying the
20 present invention and some of the apparatus for
carried out or executed.
carrying out said method.
A further object of the present invention is to
Fig. 6 is a plan view illustrating another step in
provide an improved method of making safety
the improved process or method whose preceding
razor blades, enabling production of skeleton type
steps are illustrated in Fig, 5.
blades made from several different kinds of steel
Fig. 7 is a plan view of an improved double
in which the cutting edge or edges of the blades
edged blade embodying one form of the present
are made from high grade steel stock and the
invention and manufactured by an improved
cross struts or connecting members are made from
method and/or apparatus embodying said inven
relatively low grade steel.
tion.
The foregoing and other objects and advan
Fig. 8 is a View similar to Fig. 7 illustrating the
tages of the present invention will appear from 30 preformed or shaped blank as it appears at one
the following description and appended claims,
stage in the manufacture of the blade of Fig. '7.
reference being had to the accompanying draw
Fig. 9 is an enlarged section taken substantially
ings forming a part of this specification, wherein
along the line 9_9 of Fig. 8 looking in the direc
like reference characters designate corresponding
parts in the several views.
By virtue of the present invention it is possible
tion of the arrows.
to form cutting implements, such as safety razor
blades, utilizing a metal blank containing a rela
tively small amount of metal in that the outline
of the cutting implement or blade is formed by
a wire or ribbon of the metal. As is known, wire
contains a work-hardened outer skin which is
of more uniform porosity and is harder than the
inner or core portion of the wire. According to
the present invention the wire is formed into a
in the direction of the arrows.
Fig. 10 is a transverse sectional view taken sub
stantially along the line lë-lß of Fig. 7 looking
Fig. 11 illustrates suitable die apparatus for
carrying out one of the steps of an improved
method of manufacturing the blade of the pre
ceding views.
Fig. l2 is a plan view of a finished razor blade
y
blank in any suitable manner, as by means of a
press so that the wire, that is the blank into
which it is formed, is comparable in shape to the
outside rim or outline of the ñnished blade. The
blank is then put through press operations or
rolling operations to flatten it out and in one
form of the present invention as will be seen
produced by a further improved method embodying the present invention.
Fig. 13 is an enlarged transverse section taken
substantially along the line iS-ES of Fig. 12,
looking in the direction of the arrows.
Fig. 14 is a view similar to Fig. 12 showing the
razor blade blank at one stage of the present
method or process; and
Fig. 15 illustrates suitable die apparatus for
performing a step in the process or method of
hereinafter, one side of the blank can be flat
manufacturing the blade of Figs. 12 and 13.
tened more than the other side so as to produce ¿. .
Figs. 16 and 17 are plan views of razor blades
made according to the process shown in Figs. 2
a relatively thin and flexible blade portion at one
side and a relatively thicker and less iiexible
blade or cutting portion at the opposite side. If
desired, the wire may be formed into a blank
which is thereafter coined or swedged in such a f‘
manner that a work-hardened surface of appre
and 5, respectively.
Before explaining in detail the present inven
tion it is to be understood that the invention is
not limited in its application to the details of
construction and arrangement of parts illustrat
ed in the accompanying drawings, since the in
ciable thickness is provided on the blank at the
thinnest part which forms the final cutting edge
of the blade. rl’he cutting edge of the blade is
then formed or ñnished by a honing operation
which sharpens the edge thus formed in the
work-hardened surface portion of the metal
blank.
The improved razor blades and improved proc
vention is capable of other embodiments and of
being practiced or carried out in various ways.
Also it is to be understood that the phraseology
or terminology employed herein is for the pur
pose of description and not of limitation, and it
is not intended to limit the invention claimed
esses or methods for manufacturing the same as
Method or process “a”
well as suitable apparatus for producing them are
disclosed in the accompanying drawings, in
which:
Fig. 1 is a plan view illustrating a part of an
improved process or method embodying the pres,
herein beyond the requirements of the prior art.
Referring now to Figs. 7 to 11 inclusive of the
drawings and in accordance with method or proc
ess “A,” the finished razor blade of double-edged
skeleton type, is shown vas a whole at 2B. This
5
2,409,604
6
blade, as shown, is provided with curved cross
struts or interconnecting members 20a. It will
the numeral 30 and it is fed from left to right in
the schematic illustration of Figs. l and 2. The
be seen that the ends of the original blank have
been secured together at 2| by means of weld
wire ñrst passes between a pair of superimposed
guide and pressure rollers 40, one such roller be
ing shown. The cross section of the wire 30 is
somewhat reduced during its passage between the
lrollers 4U and this reduced cross section of the
wire is indicated at 3l. From the rollers 40, the
wire stock is fed to a pair of superimposed flat
ing, or in any other suitable manner, as seen in
Fig. 7. As clearly shown, the blade 20 is pro
vided with a cutting edge or member 22 which is
relatively thinner and more ñexible than the op
posite cutting edge, member or portion 23, the
member 23 being somewhat thicker and less flex 10 tening rollers 4I, one being shown, which rollers
ible than the blade member 22. This can be
ñatten the wire and thus change its cross section
seen clearly in Fig. 10.
from a circle into a rectangle or relatively thin
The process in the present instance, identiiied
iiat strip or sheet, as indicated at 32, Fig. 1.
for convenience as process “A,” comprises form
The iiat strip 32 is fed to a pair of form rollers
ing the blank 24 from a length of wire of circular 15 shown as a whole at 42 between which the flat
or round cross section, which wirey may be passed
strip 32 is rolled to produce a somewhat thinner
through, for example, a press (not shown) so as
strip and is split by a peripheral cutter on the
to produce the blank shown in Fig. 8 which is ’ Ytop roller and formed or shaped by the rollers
comparable in size to the outline and general con
42 to produce a pair of separated strips or por
tour of the ñnished blade 20. The blank may be 20 tions 33 and 34. It will be understood that the
preshaped or formed in other ways, however.
combined flattening and cutting and shaping
After the blank shown in Fig. 8 has been formed,
rollers 42, one of which is shown, are so ccn-4
the ends of the wire are secured together at 2li
structed and arranged as to produce divided strips
by welding, or in any' other suitable manner.
one of which is thicker and less flexible than the
rI'he blank is then placed in a suitable die ap 25 other. For example, the strip or section 33 is rela
paratus such, for example, as the die apparatus
tively thicker and less -iiexible than the strip 34.
comprising a lower die member 21 and an upper
It will be understood that the shape and size of
die member 28, as shown in Fig. 11. The die
the divided strips 33 and 34, as well as their dif
members are brought together and the blank of
feernces in flexibility, etc., are determined by the
Fig. 8 is transformed into the blank shown in 30 character, size and formation of the rollers 42, as
Fig. 10, said blank having a cutting edge or por
also by the location of the peripheral cutter
tion at one side, namely the edge 23 which is rela
on the upper roller. Moreover, while I have il
tively thicker and less flexible than the cutting
lustrated rollers 42 for producing strips of differ
edge or portion 22 at the opposite side which is
ent width, thickness and ñexibility, the rollers
thinner and more flexible than the opposite edge 35 can be modified to produce identical strips, if and
or blade portion 23.
when desired.
l
After the finished razor of the form shown at
The divided strips 33 and 34 are then‘separated
2U in Fig. 7 is removed from the die apparatus,
further apart by suitable means (not shown) and
the cutting edges of the blade are given their
continue to travel toward the right of Fig. 1 until
' final form by a honing operation (not shown) 40 they reach a predetermined point, such as at the
which sharpens the edges thus formed in the
work-hardened surface portion of the blank.
right-hand end of Fig. 1, at which point previ
cuslyformed or shaped curved strut members,
Thus it will be seen that the method or process
transverse supports or bridge pieces 35 are placed
“A,” illustrated in Figs. '7 to 11 of the drawings,
between the strips 33 and 34 and connected at
constitutes the steps of forming from a length of 4.3 their opposite ends to the inner opposed Íun
preferably circular or round cross section wire,
a blank which is comparable in shape to the out
sharpened edges of said separated strips. The
ends of the struts 35 are secured to the strips
side rim, outline or contour of the iinished blade,
securing the ends of the wire formed blank to
1 33 and 34 in any suitable manner, as by welding.
Referring now to Fig. 2 of the drawings, the
gether after the shaping or forming operation, > ï separated strips 33 and 34 with their fixed bridge
ñattening the wire formed product into a flat
shaving blade of skeleton form having two cut
ting edges, one of the cutting edges being de
pieces orcurved strut members 35, pass into and
through a suitable oven 43 to be continuously
annealed therein so as to remove the strains pro
formed or flattened to a greater extent than the
duced in the built-up strip or blank because of
other cutting edge so as to produce a double- i ï the welding operation and to soften the welding
edged razor blade in which one of the cutting
flash. ` The built~up strip or blank comprising
edges is thinner and more flexible than the
the portions 33 and 34 and the bridgerpiece‘s or
other cutting edge thereof.
struts 35 is next fed between a pair of super
imposed grinding wheels 44, _one only being
Method or process “b”
shown, which grind off or remove the welding
Referring now particularly to Figs. 1 to‘4 in
clusive of the drawings, there is shown in these
figures a somewhat modified and improved meth
flash and smooth out any irregularities or burrs
which may be present on `the built-up strip or `
od or process and suitable apparatus for carry
From the flash removing cperation at 44, the
built-up strip or blank passes toward the right
ing out said method, the present method or process
being referred to for convenience, as method
IIB.”
In carrying out the present method I prefer to
use stock of high-grade steel in the form of wire,
since wire, particularly wire of round cross sec
tion, is the cheapest standard stock. The wire
which is preferably annealed is fed into `the ap
blank.
.
of Fig. 2 until it comes into contact with an
automatically operable cutting device 45 which
serves to out or sever the iinished blade from the
strip.`
In Fig. 16 a blade finished or produced
" in accordance with the method of‘Figs. 1 and 2
paratus continuously from a suitable‘drum or reel
is shown as a whole at 36, this blade having cut
ting edges or portions 33 and 34 which are of
different degrees of thickness and flexibility as
of wire (not shown). Referring particularly to
Fig. 1, the wire stock is indicated as a Whole by
' gether in Vspaced relation by the iinished bridge
described above. -and which are `connected to
2,409,604
7
pieces or cross struts 3l'. After thev blades 36
have issued from the cutting operation, their
of the shaped blade from the press operation at
62.
The blade 53 is then passed between a pair of
cutting edges 33 and 3d are given their final
form by a suitable honing> operation to sharpen
these edges which are located in the work-hard
ened surface portions of the razor blade.
The sectional views of Figs. 3 and 4 relating to
method or process “B” indicate, in somewhat
exaggerated manner, the shape and formation of
the blade portions 33A and 34 after they issue from 10
blade. Prior to the sharpening or honing opera
tion and just after the formation of the blade
the separating and shaping rollers ¿l2 of Fig. 1
polishing to provide the desired cutting edges
superimposed rotating hones 63 and Ell (see Fig.
6) so as to sharpen the cutting edges 54 of the
by the press, it will be found that the blade pos
sesses a sharp edge section of work-hardened
metal which requires little more than honing and
thereon. It is not necessary, according to the
and after the blade is separated from the blank
present invention, to subject the blade 53 to a
as shown at the right of Fig. 2 respectively. Fig.
conventional type of grinding operation which
4 illustrates clearly the differences in the cutting
edges 33 and 3d of the ñnished blade. In Fig. 4 15 would, in normal operation, remove the work
hardened surface portions of the metal. All that
the cutting edge or blade portion 33 is shown as
is required is a honing and polishing operation
being thicker and narrower than is the opposite
which preserves thc Work-hardened surfaces of
cutting blade or portion 3d which, as clearly seen,
the metal blank and utilizes it to form the sharp
is wider, thinner and thus more iiexible than
the cutting portion or member 33.
20 cutting surfaces or edges Ell, 54 of the blade.
After the blades 53 have been honed by the
With respect to method or process “13,” it will
honing members or wheels 63, Gd, they are car
be understood that while I have disclosed a cer
ried, for example, by an endless conveyor belt 65
tain sequence of steps or operations of my im
into and through a heat treating furnace which
proved method or process, it will be understood
that the order of the steps or operations may be 25 is schematically indicated at 66 in Fig. 6 to be
continuously heat-treated during their passage
changed from that illustrated in the drawings.
through such furnace. The size of the furnace
66 will be determined by the amount of heat treat
Method or process “C”
ment to which it is desired to subject the blades
My improved method. or process designated as 30 53. After the blades issue from the heat-treating
process “C” is illustrated, somewhat schemati
furnace EB, they are in finished form ready to be
cally, in Figs. 5 andl 6 of the drawings. In ac
packaged.
cordance with this modiñed and improved meth
Method or process "D”
od or process embodying my invention, I conœm
plate the production of a skeleton type double 35
Method or process “D” embodying the present
edged razor blade formed from stock> of relatively
invention is illustrated in Figs. 12 to 15 inclusive
low cost, such as steel wire, preferably of round
of the drawings. Method or process “D” is gen
or circular cross section. One such blade is indi
erally similar t0 method or process “A” previously
cated as a whole by the reference numeral 53 in
described, In accordance with process “D,” it is
Fig. 17. The blade 53 comprises cutting edges 40 desirable to produce finished skeleton double
55%-, 54, cross struts or bridge pieces 55, 55 which,
edged razor blades from steel wire, such as wire of
as shown, are curved to i'lt a standard “Gillette”
round or circular section. In accordance with the
type of razor frame, the adjacent end portions
present process, a length of round wire is prefer
of the strut member 55 at the left side of the
ably passed through a press, such as that illus
blade having been secured together by welding, 45 trated at 62 in Fig. 5 of the preceding method or
as indicated at E6.
process “C,” and shaped therein to conform to
As inY the previously described and illustrated
the outline or finished shape or contour of the
method, designated as method or process “B,”
finished blade. Such a blank is indicated as a
wire of round cross section shown at ‘Ell in Fig.
whole at 'lli in Fig. 14. This blank constitutes
5 is fed from a reel or the like (not shown) to a 50 spaced blade portions in which the cutting edges
pair of pressure and guide rollers 60. These
of the blade are formed, and interconnecting cross
rollers are preferably superimposed one above the
other, only the top roller 69 being illustrated.
The wire passes to the right from the pressure
and guide rollers 60. During the passage through 55
these rollers the wire 5G is reduced somewhat in
cross section, as shown at 5l. The wire 5l then
passes through and betwen a pair of superim
posed ñattening rollers El, only the top roller
being shown.
These rollers serve to flatten the 60
wire, changing its cross section from a circle as
Shown at 5l into a rectangle. In other words,
the flattening rollers 6l reduce the round Wire
5I to a ilat thin strip 52.
The flat strip of steel stock 52 is now fed into 65
a conventional type of press indicated generally
by the reference character 52 in Fig. 5. When the
stock issues from the press 62 it will have the
shape or formation and outline of the ñnished
razor blade shown in Fig. 17 and designated as a 70
whole by the reference character 52. The step
of welding together of the free ends of the left
strut or connecting member 55 at point 5S has
not been illustrated but it will be understood that
this Will likely occur subsequent to the issuance 75
struts or bridge pieces 7l. The free ends of the
bridge piece 'H at the left of Fig. 14 are secured
together at 'l2 by welding, or in any other suit
able manner. The blank of Fig. 14 is then placed
in a suitable >die apparatus such as that shown in
Fig. 15 in which the blank is placed between a
lower die member 13 and an upper die member
1li, pressure being applied to the blank so as to
‘shape it into the finished blade as indicated as
a whole at 'l5 in Figs. 12, 13 and l5. After the
blade has been removed from the die apparatus
of Fig. 15, all that is necessary to complete it is
to subject the cutting edges 'HCS thereof to a honing
operation so ,as to produce finished cutting edges
in the work-hardened surface metal of the cutting
members of the blade.
The purpose of method or process “D” is to
produce a double-edged skeleton type razor blade
capable of fitting the “Gillette” type of razor
frame and one in which the cutting edges are
identical, and in which said cutting edges are
formed in the work hardened surface metal of
the blade.
From the foregoing it willbe seen that I have
2,409,604
l0
suitable apparatus for carrying them out for the
purpose of producing skeleton type double-edged
mined length from the strips and struts to pro
vide the ñnished blades, and thereafter sharpen
ing the cutting edges of said cutting edge blank
razor blades of novel structure. The razor blades
portions.
produced in accordance with methods or proc
esses identiñed as “A” and “B”V and described
above are each provided with a relatively thick
and inñem'ble cutting edge or portion at one side
and a relatively thinner and more flexible cutting
edge or portion at the opposite side, The purpose
of producing a blade such as that produced by
2. The method of producing a plurality of razor
blades of the double edge type and of skeleton
form from a blank of steel wire, which comprises
the steps of flattening the wire into a ribbon-like
provided several novel methods or processes and
the methods or processes identiñed as “A” and
“5,” is to make available to the users of safety
razors, a razor blade which can be used to give,
as nearly as possible, the user a shave like he
would obtain from a barber. As is well known,
.
strip having a thickness substantially correspond
ing to that of the blades to be produced, longitu
dinally slitting the strip in two While at the same
time forming cutting edge blank portions along
the outside longitudinal edges of the two sections `
of the strip, moving the strip sections apart and
welding pairs of metal cross struts to the sepa
rated strip sections at predetermined points, heat
treating the attached strips and cross struts,
the average barber always has used two razors in
grinding the strip sections and cross struts to re
order to give a customer a clean shave, especially
move the welding flash, thereafter severing pieces
in the event said customer had an unusually
“tough” beard. The barber uses a heavy razor 20 of predetermined length from the welded together
blade for the first shaving operation and then
ñnishes the job with a razor blade which> is some
strip sections and struts to provide the ñnished
blades, and thereafter sharpening the said cut
ting edge blank portions.
what lighter and more flexible than the blade of
3. The method of producing a plurality of razor
the first mentioned razor. Therefore, by virtue
of the present blades of Figs. l and '7, it is possible 25 blades of the double edge type and of skeleton
form from a blank of steel wire in which one of
for the user to employ the heavier and less ilex
the cutting edges of the blade is relatively thicker
ible cutting edge or blade portion for the first-over
and stiffer than the other cutting edge, which
shave and then follow up with the opposite cutting
comprises the steps of rolling the wire contin
edge or blade portion which is relatively thinner
and more iiexible for the so-called “clean-up” 30 uously to flatten it into a ribbon-like strip, longi
shaving operation.
tudinally slitting the strip into two sections of
different widths while at the same time forming
I claim:
1. The method of producing a plurality of razor
cutting edge blank portions along the outside
blades of the double edge type and of skeleton
edges of the two sections of the strip in which one
the steps òf flattening the wire by rolling contin
than the other cutting portion, moving the two
strip sections apart, placing pairs of metal cross
struts between the separated strip sections and
attaching the same to said sections at predeter
mined points, sharpening the cutting edges on
said cutting edge blanks, subjecting the attached
strip sections and cross struts to heat treatment,
form from a blank of steel wire, which comprises 35 cutting portion is relatively thicker and stiffer
uously into a ribbon-like strip having a thickness
substantially corresponding to that of the blades
to be produced, longitudinally slitting the strip in
two while at the same time forming cutting edge
blank portions along the outside edges of the two
sections of the strip, separating the strip sections
and securing thereto at predetermined points
and thereafter severing the sections and cross
struts at predetermined points to separate the
grade steel, heat treating the attached strips and 45 ñnished blades from the said strip.
LEONARD A. YOUNG.
cross struts, thereafter cutting pieces of predeter
pairs of metal cross struts formed from a lower
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