close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3078581

код для вставки
Feb- 26, 1963
J. TIMMERMAN ET Al.
3,078,571
CUTTING HEAD FOR USE IN A DRY SHAVING APPARATUS HAVING v
AN OVAL SHAPE MOVABLE CUTTER
Filed Feb. 5, 1960
8x,
4
INVENTOR
HENRIGUS J. DRIESSEN
ANNE KOOISTRA
GERRIT STARRE
BY
JAN TIMMERMAN
3,978,571
Patented Feb. 26, 1983
1
2
FIG. 1 is a sectional view taken on an axis of rotation
3,078,571
of a cutting head together with its drive;
CUTTENG HEAD FQR USE IN A DRY SHAVING
APPARATUS HAVING AN OVAL SHAPE MOV
ABLE QUTTER
FIGS. 2 and 3 are a bottom view of a cutting head
according to the invention; and
Jan Timmerman and Anne Kooistra, Eindhoven, and
Gerrit Starre and Henrietta .losef Driessen, Drachten,
Netherlands, assignors to North American Philips Com
pany, ind, New York, N.Y., a corporation of Delaware
Filed Feb. 3, 196b, Ser. No. 6,478
Claims priority, application Netherlands Feb. 2.0, 1959
3 Claims. (Ci. 39-43)
This invention relates to improvements in or relating
FIG. 4 is a bottom of a cutting member according to
the invention.
A shear plate 1 is provided with slots 2 and forms a
running groove 3, in which a cutting member 4 is centered.
The sides 5 on the inner side of‘the cutting edges 6 are
located on feet 7 ‘of the cutting member 4 thereby pro
viding the centering. The cutting member 4 is driven by
a shaft 8, which is provided at the top end with a flattened
to cutting heads for use in a dry shaving apparatus co-m—
part 9, located in a corresponding opening 10 of the
prising an apertured shear plate and a rotatably arranged
cutting member 4. The shaft 9 is provided at the bot
cutting member co-operating herewith and centered in a 15 tom end with a square 13, which is capable of moving in
running groove of the shear plate, a dry shaving appa
an axial direction in a gear wheel 14, to which it is se
ratus comprising such a cutting head and a cutting mem
cured in the direction of rotation. A spring 15 holds
her and shear plate for use in such a cutting head.
the cutting member 4 against the shear plate 1.
It is already known to center, in a cutting head for use
In a known embodiment of the cutting head shown in
in a dry shaving apparatus, comprising an apertured 20 FIG. 1 the co-operation between the sides 5 of the cutting
shear plate and a rotatable cutting member co-operating
member 4 and the Wall 16 of the shear plate 1 provides
herewith, the cutting member in a running groove of the
the centering. Both the side 5 and the wall 16 are then
shear plate in order to prevent the cutting member and
shaped in the form of clear circle cylinders.
the shear plate abrading each other. As a matter of
As shown in FIG. 2 the wall 16 is shaped in a form
course, a small amount of play in a radial direction of 25 deviating from that of a circle and indicated by the broken
the cutting member is required in this case, in order to
line 17. Owing to the shape of the wall 16 the sides 18
minimize the friction between the cutting member and the
and 19 can run along the outer wall 20 of the groove,
shear plate.
so that the rolling-off phenomenon on one wall is pre
During operation of this known cutting head a sharp
vented.
piercing noise may sometimes occur abruptly. Extensive 30
According to FIG. 3 the sides 22 and 23 located on
research has proved that the cutting member tends to
the same side of the center line 24 are ground off. The
roll off its centering, which gives rise to considerable
sides 25 and 26 are therefore capable of engaging the
centrifugal force. In the period when the cutting mem
outer wall 2i) of the running groove 3, so that the latter
ber moves toward the rolling~oif position, a slip occurs
can be scraped clean throughout its width.
between the cutting member and its centering, which 35
FIG. 4 shows the outlines 27 and 28 of the centering
produces the aforesaid sound. It has been found that
cutting edges. The outline 28 is shaped in a form deviat
the considerable centrifugal force and the slip of the
ing from that of a circle 29 owing to grinding-01f of the
cutting member in its centering are the essential factors
sides 22 and 23.
producing this sound and a heavy frictional force.
What is claimed is:
The invention has for its object to avoid the objection
1. A cutting head for use in a dry shaver comprising
able piercing noise explained above.
an apertured shear plate having a running groove, a
In accordance with the invention either the centering
rotatable cutting member coacting therewith and cen
wall of the running groove or the envelope of the centering
tered in said running groove, said shear plate being prm
sides of the cutting member is shaped in a form deviating
45 vided with centering walls, the sides of said cutting mem
from that of a circle, for example in an oval form.
ber adjacent to said centering walls being shaped in a
Thus the rolling-off phenomenon and hence the abrupt
substantially oval form.
occurrence of the piercing noise are avoided.
2. A cutting head for use in a dry shaver comprising
A practical, simple embodiment of the invention con
an apertured shear plate having a running groove, a
sists in that in a cutting head in which the centering of
the cutting member takes place by means of the sides 50 rotatable cutting member coacting therewith and cen
of the feet provided with cutting edges, all sides located
tered in said running groove, said cutting member having
on one side of a center line of the cutting member are
feet with sides provided with cutting edges wherein all
ground ed on the inner side.
sides located on one side of the center line of said cutting
In this manner hair and the like is prevented from
member are ground off on the inner side and said sides
55
accumulating in the running groove, which might cause
of said cutting member being substantially oval in shape.
the cutting member to be jammed. The running groove
3. A cutting head for use in a dry shaver as claimed
is scraped clean by the cutting member.
in claim 2 wherein said sides are ground off to a con
The sides are preferably ground off to an extent such
that the cutting member can touch simultaneously both
the inner wall and the outer wall of the running groove of
?guration such that the cutting member is capable of
engaging simultaneously both the inner wall and the
outer wall of the running groove of said shear plate.
the shear plate.
In this manner the running groove can be scraped clean
throughout its width, while the cause of the rolling-01f
phenomenon is avoided most effectively.
The invention also relates to a separate cutting member
and a separate shear plate.
The invention will be described more fully with ref
erence to the accompanying drawing.
References Cited in the ?le of this patent
UNITED STATES PATENTS
65
2,229,971
2,283,865
2,337,391
2,339,831
Hammerling __________ __ Ian. 28,
Cohen ______________ __ May 19,
Horowitz et al _________ .. Dec. 21,
Andersen ____________ .__ Jan. 25,
1941
1942
1943
1944
Документ
Категория
Без категории
Просмотров
0
Размер файла
204 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа