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Патент USA US2133018

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Oct. 11, -1938.
vG. CAHILL
v
Filed sept'. 19, 1932>
'
2,133,018
Patented Oct. 11, 1938
_ 2,133,018
YUNITED STATESV.2,133,018PATENT oFFlcE
RAzon BLADE>
e
n v f Gerald canili, chicago, 111.-
_
Application VSeptember 19, 1932, Serial No. 633,892
`
à claims.
(o1. 304351)
this form of'blade, circular'attachment openings
This invention relates to razor blades and more
particularly to blades of the thinl ñexible type> 'I8 are employed, althoughV it will be understood
that any’suitrable form of attachment opening
adapted to be clamped within a guard-equipped
holder.
l
`
~
~
.
may be used. Laterally disposed with respect to
theopenings IllV are longitudinal slots I9 rwhich
are provided near their Yends with outwardly
‘
In clamping blades of this type between the
curved clamping surfaces of the holder, the
blade itself is forced into a position of apprecia-k
curved portions 20. The outwardly curved por
ble transversel curvature and, even though the
blade be bent about a central axis or hinge,` the
vide therebetween thin flexible hinges I6. Addi
tions 20 lie adjacent the recesses I1 so as to pro
10 strain causes the cuttingV edges of the blade *to>` tionalpflexibility maybe obtained by employing 10
become slightly waved, Warped or otherwise dis-Y e supplemental-"slots 2l'Ia which may be of any kde
torted. A primary object of the present inven ' fsired number or shape. The slots 20a make it'
tion is'to provide a bladeeadapted to be clamped practical to use heavier metal in the blade with
about the fulcrum of the holder without impos- ` resulting better cutting edges.
The operation of __
this formof blade is substantiallythe same as 15
l15 ing undue stress upon the cutting edges andto
that of theblade shown in' Fig; 1, the edge pore
tire blade by providing hinge areas between‘the Vtions ofthe blade turning easily upon the hinges
longitudinal center of the blade and the cutting .I6 vsoas to provide straight andtrue edges which
relieve to a large extent’the stress upon the en- '
by the vresistance exertedvupon '
_
edges. Other specific objects andY advantages e' are not _distorted
, the central portion of the‘blade when it is flexed.
20 Will -appear as _the speci'ñcation proceeds. '
The blade vshown in Fig. 3 illustrates another
rEhe invention is `fully describedin >the follow
form of the invention. The blade is rectangularv
‘in shape having cutting edges I0 and straight
ing specificationand shownin the accompany
ing drawing, in which-
`
`
‘ `
'
end walls v2l* equipped with‘extensions I I. A lon
VFig._ 1 is aplan viewof the blade embodying
my invention; Fig. 2, a plan’view of a >modified Y'gitudinal»` slot 22 extends through the central 25 c
-portionof Ythe blade. -Laterally disposed with re
~'speelt tothe slot 22 are interruptedslots’23 which
form of blade embodying my invention; and Fig.
3, a plan view of another form of .blade >embody
f
, arèf'outwardly-turned near their ends as indi
In the illustration given in Fig. 1, the blade is
catedfby the numeral 24. Between the end por
ing my invention.
~ ,
tions 24 of the slots 23 and the ends 2l of the
disposed cutting edges I0 and having reduced~ blade are provided hinge areas I6 about which
end extensions II. The blade Vis shown with `the edge portions off the' blade may readily
slightly rounded corners I2. A slot ^ I3 extends' swing. The areas I6 being less than the areas
through the longitudinal center of the blade between the ends of slots 22 and the ends of
35 and is provided with enlarged central andV end extensions II will cause the blade to turn upon 35
openings I4 Yadapted to receive projections on the kthe hinge _areas I6 during the clamping opera
holder by Which the blade may be centered and`
While Vin the illustrations given, I have shown
accurately locked upon the holder. C_ommuni-`
30 of general rectangular shape having- oppositely
tion.
.
y
eating with the end openings I4 are laterally f certain lforms of blades equipped laterally with
slots or openings, it will »be understood that my 40
40 extending» slots I5 which are curved outwardlyV
toward the ends of the blade'. The hinge areas Yinvention is applicable to other forms of blades
I6 between the ends of slots I5 4and the blade
ends, beingV of less extent than the metalbetween
the’e'nds of slot I3 and the extensions Il, permit
and that'the laterally extending hinge areas may
be provided by other forms of slots or openings,
continuous, interrupted or spaced apart, without e
the blade, during the clamping operation, to ' departing from the principle of my invention. If `
bend about hinge areas I6 rather than'along theY
longitudinal center of the blade. The easy yield
ingV of the edge portions of -the blade along the
dual hinges I6 results in placing very little strain
50 upon the cutting edges and leaves'them unaf-j
fected by any stress which may be placed uponV
the central and Ymore rigid portion ofthe blade.
In the illustration given in Fig. >2, the blade is
ka blade having a Vsingle cutting edge is employed,
` the YlateralV or intermediate hinge produces a true
>cutting jedge rsubstantially relieved from the
stress ofthe clamping operation. Ifk a two-edged
„blade isVY used, the dual hinges intermediate the '50
~ longitudinal center of the blade and the cutting
edges bring about the same beneficial result.
i vThe foregoing detailed description has been
provided with cutting edges I0, end extensions I I ¿given for clearness of understanding only, and
no unnecessary limitations should be understood 55
55 and recesses I'I adjacent the extensions II.V In'
2,
2,133,018
therefrombut the appended claims should be portions in spaced relation to one another, and
construed as broadly as permissible, in view of
Y, the prior art.
I claim:
l. A double-edged razor blade of thin metal
having reduced ends extendedin line with the
longitudinal center, a `positioning opening on its
longitudinal center, openings adjacentrthe ends
of the Vblade afg-ld about midway between the lon
gitudinal center and each cuttingedge, said
openings extending llaterally beyond said reduced
said end portions being of a jwidth less than that
of said main body portion, and flexible portions
in the path of said stresses forming narrow bands
directed at right angles to said cutting edges and
connecting said end portions and said spaced
blade portidns within the limits deiined by the
length of the cutting edges of the blade.
55A safety razor blade having a lcentral lon
gitudinal slot and recesses between the blade end
portions and the portions spaced by said slot,
cutting edges on said spaced portions, said re
ends and to provide between them and the ends
' of the blade hinge areas parallel with the longi-4 , cesses and the ends of said slot cooperating to
tudinal center ofthe blade, the distance between deñne narrow bands directed at right angles to
said openings and the adjacent. ends ofïthe blade ' said cutting edges within the longitudinal limits
'. of said cutting edges and flexibly connecting s_aid
tioninggopening and the outer ends of said re
endrportion's and said spaced bladeportions.
Y being'less than the distance between said posi
duced blade
ends.
'
v
,
,
A.
,
15
' A safety razornblade having a central lon
2. A double‘?edged razor blade of thin metal 'A giltffidinal slot laterally extending atgits ends and
having reduced ends extended in line with the recesses between the blade end portions and the 20
longitudinal center, a central attachment open
portions spaced by said slot, and‘cutting edges
ing, longitudinal auxiliary slots between the cen
on said spaced blade portions, the blade portions
ter or" said blade and its cutting edges;r said slots Vbetween said recesses and the lateral extension:
having their ends turned at right angles so as'to of YYsaid slot forming necksV extending _at right
25 fextend laterally with respect to said central
angles to the longitdjdinal axis of the blade with~
opening and beyond said reduced ends, said slot in the longitudinal limits of said cutting edges.
portions beyond said reduced ends providing be
A safety razor blade Vhaving a central lon
tween them and the ends of the blade hinge areas
gitiidinal slot, parallel cutting edges on the blade
parallel with the longitudinal center of the blade, portions spaced by said slot, end yportions of' a
30 the distance ?between said slot portions and the
width less ?than that of the main: body of the
endsïof the blade being less thanthe distance blade, and ñeXible portionsëformingäfiarrow bands
between said central opening and thejgro‘uter ends directed at right angles to said cutting edges and
of said reduced blade ends. 'Y v .
connecting saidv yend portions and said spaced
3. A safetyrazor blade adapted to be clamped blade portions, theëpliability of said flexible por
in a holder therefon and consisting of a main
body portion and endgportions defìned?by recesses '
in'said blade¿ said main bodycportionv comprising
two parallel gcuttingjedge portionsvr and each one
of said> end portions being ilexibly connected to
the'gtwo cuttin'g'edgeïportions, the ñexible con
nection between said blade portions forniing'nar
row bands directed at right angles to said cut
ting edges within the'limitsedeñned by the cut
ting edges of the blade.
E
tions exceeding that of said end portions.
8. A saíety razor blade adapted to be clamped
in a holder therefor, and consisting of a main
body portion and end portions defined by recesses
iiiÍsaid blade, said main body portion .comprising
two parallel edges, a» longitudinal? slot for posi -40
tioning vthe blade in the said holder, lateral slots
atreach end ofthe body pprtion bisected by said
longitudinal slot, said lateral slots extending be
yond said end portions and forming flexing necks
4. A Ysafety razor ,bladeY subject to Vflexing between them and the rends of the blade, the i'
stresses when clampedin a holder therefor and - ilexibilitygif said ?lexing necks exceeding that of
consisting of a mairî bodyrpo'r'tion and endpor
tige said end portions.
.
»
tions defined by recesses’in said blade, said main
i
GERALD CAlï-IîLL.>
bod;7 portion comprising two parallel cutting edge
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