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Патент USA US3098305

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July 23, 1963
J, F, wAHL
3,098,295
BLADE FOR A DRY SHAVER
Filed Feb. 19, 1960
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United States Patent 0
1
3,098,295
BLADE FGR A DRY SHAVER
John F. Wahl, Sterling, 111., assignor to Wahl Clipper
Corporation, Sterling, Ill, a corporation ot‘ Illinois
Filed Feb. 19, 1960, Ser. No. 9,991
3 Claims. (Cl. 30—43)
3,998,295
Patented July 23, 1963
2
FIG. 5 is a sectional view of a modi?ed form of inner
blade having an alternative base portion.
FIG. 6 is a sectional view on line ‘6—6 of FIG. 5.
Referring now to FIG. 1 of the drawing, a dry shaver
indicated generally by the reference numeral 10 includes
a vibratory electric motor 12 mounted in a casing section
14.
This invention relates to the movable blade in a dry
1
Motor 12 has a magnetic core 16 and an armature
18 which is mounted for vibratory movement in associa
shaver.
tion with the pole faces of the core in a manner well
This application is a continuation-in-part application 10 known in the ‘art.
based on my prior, copending application Serial No.
An inner movable blade 20 includes a portion 22 (FIG.
535,570, which has matured into Patent No. 2,959,854
2) formed from initially ?at sheet metal and attached
granted November 15, 1960, wherein the present subject
base portions 24 and 25 (FIG. 3) formed from insulating
matter was a non-elected species.
material such as molded nylon. As best seen in FIG. 3,
Dry shavers have at least one resilient ?xed outer blade, 15 base portion 24 of the inner movable blade is attached
and a cooperating movable inner blade powered by a vi
to the “free end 26 of armature 18 by means of bracket
bratory motor. The vibratory motor generally has a piv
otally mounted armature associated with the pole faces of
members 28 suitably secured to the opposite surfaces of
free end 26 and base portion 24.
the core, and the inner blade is connected to and driven by
The sheet metal portion 22 of the blade, as shown in
the free end of the armature. Since the free end of the 20 FIG. 2, includes a perforate cutting region 30, mounting
pivoted armature moves in an arcuate path, the portion
holes 32, and diagonal slots 33 which introduce desired
of the inner blade connected to this free end also moves
resilience and flexibility in the blade for reasons to become
in an arcuate path. Despite this, the cutting region of the
apparent below. In the embodiment shown, the initially
inner blade must move along a substantially straight path
?at sheet metal portion 22 of the inner blade is bent to :a
in order to maintain proper contact with the cutting region 25 cylindrical shape and is attached to the base portions 24
of the outer blade.
_
and 25, see FIG. 3, but it is understood that the sheet
In the past the inner movable blade was substantially
metal may be bent into arcuate shapes other than cylin
rigid in character and was resiliently mounted in some
drical if desired. Projection '34 (FIG. 3) is one of two
manner so that as the portion of the blade connected to
spaced projections on base portion 24- 'which pass through
30
the free end of the ‘armature moved along its arcuate path,
aligned mounting holes 32 of ‘blade portion 22 ‘and are
the tendency of the inner blade to move out of contact
received securely within apertures in base portion 25.
with the ?xed outer blade was compensated for by ‘an in
A ?xed outer blade 35 of the shaver, shown in FIG. 3,
and out movement which resulted from the resilient
is formed ‘from thin resilient sheet metal. The perforate
mounting.
cutting portion or central region 37 of the outer blade is
The rigidity of the inner blade, particularly at its con 35 generally arcuate in cross section and is mounted on the
nection with the ‘free end of the armature, was desirable
casing so it presses against cutting portion 30 of the inner
from the standpoint of durability. On the other hand the
blade. Since part of the inner blade portion 22 is resil
necessity of resiliently mounting the inner blade was ob
ient ‘and somewhat ?exible due in part to diagonal slots
jectionable because of the expense and additional parts
33, this engagement with outer blade 35 compresses the
40
required.
inner blade slightly and provides the desired cutting bias
What is needed, therefore, and comprises an important
between the blades without requiring the inner blade to
object of this invention is an inner blade having one por
be resiliently mounted on the armature.
tion substantially rigid in character which is connected to
When the shaver is in operation, the base parts 24 and
the free end of the armature of the motor, and having a 45 25 of the inner blade 20 will travel with the free end 26
cutting region portion which can move in a straight path
of the armature vl8 along ‘an arcuate vibratory path, but
despite the arcuate movement ‘of the portion of the blade
the tendency of the inner blade to move away from the
connected to the armature.
outer blade during the end parts of its vibratory path will
This and other objects of this invention Will become
be compensated for by a decrease in compression of the
more apparent when read in the light of the speci?cation 50 inner blade. This will cause slight expansion of the blade
and the accompanying drawing wherein:
so that its cutting region 36 will travel along substantially
FIG. 1 is a plan view of a dry shaver embodying the
straight lines, ‘see FIG. 4. In other words, the resilience
invention with the cover of the casing and the ‘outer blade
and ?exibility of the inner blade provides the transition
removed showing the vibratory motor ‘and its connection
necessary to permit the cutting region part of the blade
with the inner movable cutting blade.
55 to vibrate in a straight path and the base parts to vibrate
FIG. 2 is a plan view of the inner movable cutting blade
along an arcuate path.
in initial ?at form with the mounting base omitted.
FIGS. 5 and 6 illustrate a modi?ed form of inner blade
FIG. 3 is an enlarged sectional View taken on the line
40 which comprises a thin, resilient sheet metal portion
3—3 of FIG. 1 and showing one form of inner movable
42 and a base portion 44. Metal portion 42 has a per
cutting blade.
60 torate cutting region 46, ‘and both this region ‘and the re
FIG. 4 is a dynamic view (somewhat exaggerated)
mainder of the metal portion have resilience and ?exi
showing the straight line vibratory movement of the cut
bility to provide the transition mentioned above.
ting region of the inner blade and the arcuate movement
Base portion 44 has a lower part 48 which is secured
of the portion connected to the armature.
to free end 26 of armature 18 and an upper part 50 which
3,098,295
A.
vibrates ‘on an tarcuate path, said resilient portion
3
is generally arcuate in cross section. A neck 52 connects
adapted to ?ex to permit said cutting portion to vi
lower part 48 and upper part 59. Base portion 44 may
brate on the straight path de?ned by the ?xed outer
blade and to maintain said cutting portion in pres
surized engagement with the ?xed outer blade.
3. An inner cutting blade for a dry shaver comprising:
consist of molded plastic material or die cast metal.
As ‘best shown in FIG. 6, neck 52 is provided on both
sides with bosses 54, and metal portion 42 is provided with
cooperating notches 56 in which the bosses are received.
so
When this arrangement is used, metal portion 42 is bent
permanently into desired arcuate shape, whereby the
blade;
bosses and notches are eifective to maintain proper rela
tionship ‘between metal portion 42 and base portion 44. 10
The invention may be embodied in other forms without
departing from the spirit or essential characteristics there
of as set forth in the claims, and the illustrated embodi
ments are therefore to be considered exemplary ‘and not
restrictive, and the invention is intended to include all
changes which come within the scope of the claims.
I claim:
1. A blade for an electric shaver including a metal
portion having a cutting region arcuate in cross section
and a base portion, said base portion having a lower part, 20
an upper part and a neck connecting said parts, a boss on
each side of said neck, said metal portion having cooper
ating notches in which the bosses are received, at least a
a drivable portion remote from said cutting portion;
a resilient portion of ?exible sheet metal integral with
and of the same thickness as said cutting portion and
intermediate said cutting ‘and drivable portions, said
resilient portion connected to said drivable portion;
and
means adapted to connect said drivable portion to the
free end of a pivotal armature whereby said drivable
portion vibrates on an varcuate path, said resilient por
tion ‘adapted to ?ex to permit said cutting portion to
vibrate on the straight path de?ned by the ?exed outer
blade and to maintain said cutting portion in pres
surized engagement with the ?xed outer blade.
References Cited in the ?le of this patent
UNITED STATES PATENTS
portion of said metal portion having resilience ‘and ?ex
ibility to provide the transition necessary to permit the
cutting region of the blade to move in a straight path while
the base portion is moved along an arcuate path.
2. An inner cutting blade for a dry shaver comprising:
a cutting portion adapted for pressurized engagement
with a ?xed outer blade;
cutting portion of ?exible perforated sheet metal
adapted for pressurized engagement with a ?xed outer
30
21 base portion remote ‘from said cutting portion;
a resilient portion integral with said cutting portion
and intermediate said cutting and base portions, said
resilient portion mounted on said base portion;
said cutting and resilient portions formed of sheet metal
having slots therein, ‘the slots in said resilient portion
inclined at an acute angle to the direction of blade
2,164,425
2,178,669
2,181,038
2,242,405
2,265,932
2,281,434
2,306,172
2,335,607
2,601,720
2,900,719
2,915,816
2,950,530
travel; and
1939
1939
1939
1941
1941
1942
1942
1943
1952
1959
1959
1960
FOREIGN PATENTS
means adapted to connect said base portion to the free
end of a pivotal armature whereby said base portion 40
Rand _________________ _- July 4,
Lougheed ____________ _- Nov. 7,
Wimberger __________ -- Nov. 21,
Sussman _____________ __ May 20,
Wahl _________________ __ Dec. 9,
Gur Arye ____________ __ Apr. 28,
Lindholm ____________ __ Dec. 22,
Penney ______________ __ Nov. 30,
Carissirni _____________ __ July 1,
Kohner et al __________ __ Aug. 25,
Gray _________________ __ Dec. 8,
Fox _________________ __ Aug. 30,
580,032
Great Britain _________ __ Aug. 23, 1946
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