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Патент USA US3067521

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Dec. 11, 1962
_1_ F_ WAHL
3,067,511
DRIVE CONNECTION FOR A SHAVER BLADE
Filed Mal‘Ch 25, 1960
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United States Patent O
3,067,511
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Patented Dec. 11, 1962
2
1
known in the art. A motor armature 20 is pivotally
mounted at end 22 on armature bracket 17.
3,067,511
DRIVE CONNECTION FOR A SHAVER BLADE
Electric shaver 10 further includes a fixed outer or
John F. Wahl, Sterling, Ill., assigner to Wahl Clipper Cor
shear blade 26, shown in dotted line, and a movable inner
poration, Sterling, Ill., a corporation of Illinois
cutting blade 28. The left end of blade 28 engages a
Filed Mar. 23, 1960, Ser. No. 17,073
casing portion 29 which serves as a bearing for the blade.
2 Claims. (Cl. 30-43)
As best seen in FIGS. l, 6 and 7, inner blade 28 includes
a cutting portion 30 formed from initially liat thin pre
This invention relates to a drive connection, and more
hardened sheet metal. This sheet metal is curved to de
particularly to a pivotal drive connection between the
sired shape- and mounted on an electrically insulating base
10
armature of a vibratory electric motor and the inner
portion 32 as described more fully in my copending patent
movable blade of an electric shaver.
In electric Shavers of the kind powered by vibratory
application, Serial No. 797,097, liled March 4, 1959„but
it is to be understood that the principles of this invention
may be applied to electric shavers having blades of other
electric motors, a drive linger is connected at one end
to the vibrating armature and the other end is connected
>
to the movable cutting blade. In the past, as exemplified 15 types.
As best seen in FIGS. 2, 3 and 7, base portion 32 in
by Wahl Patent No. 2,256,932, FIG. 3, the base of the
the illustrated embodiment has an extension 34 at one end.
inner movable blade was provided with a centrally dis
This extension is reduced in thickness compared with the
posed notch or goove. This notch was oliset from the
thickness of the remainder of the base portion for reasons
free end of the armature so that the drive finger which
was secured to the free end of the armature had to be 20 to become apparent below, and for the most part is gen»
erally rectangular in cross section with parallel and planar
bent several times so its opposite end could enter the
upper and lower surfaces 36 and 38. As will be apparent
notch or groove in the base of the movable inner blade
later, the invention can be applied to base portions which
and establish the drive connection.
do not have an extension as such, or to members which
In this prior art arrangement the drive linger had a
in effect are abbreviated base portions.
tendency to jump out of the groove in the base of the
In this embodiment, a pair of elongated, linerally spaced
drive linger receiving slots or openings 4l) and 42 extend
through extension 34 from the lower surface 38 to the
upper surface 36, see FIGS. 3, 4 and 5. Alternatively,
As will be understood, there must be a pivotal con
nection between the free end of the drive linger and the 30 a single, drive linger receiving slot or opening could be
used, if desired.
base of the movable cutting blade. This pivotal connec
As shown, linger receiving slots or openings 40 and 42
tion must be strong and durable to withstand the continual
extend completely through extension 34, but, as will be
pivoting movement between the drive linger and the base
seen, the invention can be applied to base portions, with
of the inner movable cutting blade. Additionally, the
or without extensions, having appropriately shaped open
pivotal connection must operate freely to avoid power
ings which extend only part way through the base por
loss due to friction. For economy of manufacture the
inner movable blade during operation. In addition, be
cause of the complex shape of the drive linger, the drive
linger was somewhat difficult and expensive to form.
connection must be simple and easy to assemble accu
rately.
tion.
-
Slots or openings 40 and 42 each have side surfaces
.
44 and 46 (FIG. 3) which taper upwardly toward each
What is needed therefore and comprises the principal
By way of example, surfaces 44 and 46 lie at
object of this invention is a simple, economical, electri 40 other.
an angle of about 92 degrees with lower surface 38 of
cally insulated and durable low friction arrangement pro
extension 34. Thus, surfaces 44 and 46 deline an angle
viding a pivotal connection between the movable inner
of about 4 degrees. The spacing between side surfaces
cutting blade and the drive finger of an electric shaver.
44 and 46 of slots 40 and 42 at upper surface 36 of ex
Other objects, advantages and details of the invention
will be apparent as the description proceeds, reference 45 tension 34 is substantially equal to the thickness of drive
linger 25. Corners 48 and 50 between upper surface
being had to the accompanying drawing wherein one form
36 and surfaces 44 and 46, respectively, constitute pivot
of the invention is shown. It is to be understood that
ing regions or edges for drive linger 25.
'
the description and drawing are illustrative only and that
The above described tapered arrangement is desirable
the scope of the invention is to be measured by the ap
50 from the standpoint of economy because it is easy to
pended claims.
form slots 40 and 42 with the speciliedconverging side
In the drawing:
e
surfaces 44 and 46. However, it will be appreciated that
FIG. 1 is a plan view of an electric shaver with the cas
the side surfaces of the slots need not be tapered -to form
ing cover removed to show the general arrangement of
parts.
FIG. 2 is an enlarged sectional View showing the drive
connection of the invention.
pivoting regions therein, and the pivoting regions instead
55 of being corners may be arcuate or have other suitable
shape. Consequently under some circumstances it may
be desirable to use differently shaped slots and differently
FIG. 3 is an enlarged sectional view of the connec~
shaped pivoting regions. As stated above, however, it is
tion.
important for the spacing between the pivoting regions
AFiG. 4 is a plan view of the top surface of a portion of 60 to be closely related to the thickness of the drive linger 25 .
an extension on the base of the inner movable cutting
Drive linger 25 consists of sheet metal and is designed
. blade showing the spaced tine receiving slots formed
therein.
to be formed economically by a single stamping operation.
One end 52 of drive linger ‘25 is secured rigidly to free
FIG. 5 is a sectional view on line 5-5 of FIG. 3.
end 24 of armature Ztl by any suitable means as by rivets,
FIG. 6 is an end View of the inner movable cutting 65 see FIG. 2. Opposite end 54 of the illustrated drive linger
blade and its base.
is bifurcated, delining tines 56 and 58, see FIG. 5. Tines
FIG. 7 is a sectional view on line 7-7 of FIG. 6.
56 and 58 are designed to penetrate slots or openings 4t?
Referring now to FIG. l of the drawing, an electric
and 42 4to a point beyond pivoting regions or corners 48
shaver indicated generally by the reference numeral 10
includes a casing l2 in which a vibratory electromag 70 and Sli so that the drive linger can establish a pivoting
drive connection between armature 20 and base 32. This
netic motor 14 is mounted. The motor includes a core
means, in the form shown, that tines 56 and 58 extend
16 on which a coil 18 is mounted in a manner well
3,067,511
3
>thro-ugh slots 4i) and 42 to a point beyond the upper sur
face 3o of extension 34, see FIGS. 2 and 3.
As seen in FEiG. 5, outer edges 60 and 62 of the tines
are convergent. In addition the outer end surfaces 64
and 66 of slots 40 and 42 converge at the same angle.
This arrangement limits the penetration of the tines in
the slots, and the tines are snugly received therein with
out interfering with the pivotal connection between drive
finger 25 and the base 32. In addition, the arrangement
l
surface of said extension to the upper surface in such a
Way that the separation ofthe side surfaces of said slots at
the upper surface of said extension is substantially equal
to the thickness of said drive finger, the upper surface of
said extension joining the side surfaces of said slots to
form pivot corners, the opposite end of said drive finger
bifurcated with each tine penetrating one of said slots to
a point beyond the upper surface of said extension
whereby the drive finger can pivot on saidpivot corners,
enables drive finger 25 to support the adjacent end of 10 the outer edges of the tines converging `toward each other
base portion 32 of inner blade 28, the opposite end being
and the outer end surfaces of »the slots converging at the
supported by casing portion 29.
During shaver operation the tines of drive finger 25
same angle whereby the tines of said drive linger are re
ceived snugly in said slots without interference to the
pivot on the pivoting regions or corners 4S and Sti as
pivotal relationship between the `drive finger and the base
inner movable cutting blade 23 is driven back and forth. 15 portion of the inner movable cutting blade.
This pivotal connection between drive finger 25 and base
'2. ln an electric shaverV having a casing, a vibratory
32 is simple, strong and easy to assemble. in addition,
armature mounted within said casing and a cutting blade
the pivoting action is substantially friction free and is
having a base portion adapted to be driven by said arma
extremely quiet in operation.
ture, one end region of said base portion supported by
From the above description it is thought that the con 20 said casing, the other end region of said base portion hav
struction and advantages of this invention will -be readily
ing a drive finger receiving opening, `a drive iinger of sheet
apparent to those skilled in .the art. Various changes in
material secured to said armature and extending into said
detail may be made without departing from the spirit or
opening, the side walls of said opening converging from
losing the advantages of the invention.
bottom to top of said base portion whereby opposed sur
Having thus described the invention, what is claimed 25 faces of said drive finger engage said -base portion only
as new and desired to secure by Letters Patent is:
1. In an electric shaver, a vibratory electromagnetic
motor and an inner movable cutting blade, said motor
including an armature mounted at one end lfor vibratory
at top pivot regions, the edges of said drive finger within
said opening converging from bottom to top and engaging
correspondingly converging end walls of said opening
whereby said drive iinger supports said other end of said
movement, an elongated drive finger formed from sheet 30 base portion.
metal, one end of said drive íinger secured to the free end
References Cited in the iile of this patent
of said armature, said inner movable cutting blade includ
ing a cutting portion and an attached base portion, said
UNITED STATES PATENTS
base portion having an extension on one end, said exten
sion reduced in thickness in comparison with the thick 35
ness of the remainder of said base portion and generally
rectangular in cross section with parallel upper and lower
surfaces and having elongated linerally spaced slots eX
tending therethrough communicating with said upper and
lower surfaces to define drive iinger receiving openings, 40
the side surfaces of said slots converging from the lower
2,184,757
2,263,747
2,345,695
2,702,938
2,787,053
Sarnotey _____________ __ Dec. 26,
Stein ________________ __ Nov. 25,
Andis ________________ __ Apr. 4,
Jepson _______________ __ Mar. 1,
Kleinman _____________ __ Apr. 2,
1939
1941
1944
1955
1957
2,859,513
Bylund _____________ _?- Nov. 11, 1958
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