The invention relates to a dry-shaving apparatus comprising a drivable
shaving member and a separately drivable vibratory device.
Such an apparatus is known, for example, from CH-A-270913. The shaving
particles are collected in the apparatus and partly stick to the walls and to the
shaving member. It has been found that in practice the apparatus is not cleaned
thoroughly, for example by means of the accessory brush, after every shave. Generally,
the apparatus is merely opened and is held upside down above a wash-basin or dustbin.
Usually, while this is done, taps are given on the apparatus or the apparatus
is tapped against the wall of the basin or bin. The apparatus is then very likely
to be damaged. In CH-A-270913 a massaging element is connected to the vibratory
It is an object of the invention to improve the effectiveness of
a vibratory device in a dry-shaver to make suitable for reliable shaving head cleaning.
The dry-shaving apparatus is therefore characterized in that the
vibratory device comprises means for imparting a vibration to the apparatus, other
than for driving the shaving member for cutting, by interposing an intermittent
obstacle into the path of movement of the shaving member or a driving part thereof.
The vibratory device produces a multitude of gentle taps having the
same effect as tapping by hand but without any harmful consequences for the apparatus.
Moreover, the vibration device can be constructed in such a way that in particular
those parts of the apparatus are made to vibrate which are most likely to be soiled.
Special embodiments are defined in the appended second and following
Some embodiments of the invention will now be described in more detail,
by way of example, with reference to the Figures.
- Fig. 1 is a plan view of a shaving apparatus comprising three shaving units,
- Fig. 2 shows the shaving apparatus in a side view and partly in a sectional
view taken on the line II-II in Fig. 1,
- Fig. 3 is a sectional view of the shaving unit,
- Fig. 4 is an underneath view of the coupling member of the internal shaving
member shown in Fig. 3,
- Fig. 5 is a perspective view of the coupling spindle.
- Fig. 6 shows another embodiment in a partly sectional view similar to that
of Fig. 2.
- Fig. 7 is a plan view showing the drive lever for the trimmer and the vibration
mechanism of the embodiment shown in Fig. 6.
The shaving apparatus shown in Figs. 1 and 2 comprises a housing
1 of which a part is constructed as a holder 2 for three external shaving members
3. Each external shaving member 3 has an annular shaving portion 4 with hair entry
The sectional part of Fig. 2 shows a drivable internal shaving member
6 arranged at the inner side of an external shaving member 3, which for the sake
of clarity is shown only diagrammatically in Fig. 2. Each internal shaving member
6 comprises a central body 7 carrying a set of circumferential cutters 8 which
face the shaving portion 4. Each external shaving member 3 and the associated internal
shaving member 6 together form a shaving unit 9.
By means of a coupling spindle 10, gear wheels 11 and 12, and a shaft
13 the internal shaving member 6 is coupled to a drive mechanism, generally an
electric motor 14 to isolate the internal shaving member 6 relative to the associated
external shaving member 3. The gear wheel 11 is journalled on a pin 15 mounted
in a mounting plate 16. The gear wheel 11 has a hub 17 with an internal recess
18. To transmit the rotary movement of the gear wheel 11 to the associated coupling
spindle 10 one end of the coupling spindle is provided with a non-round flange
19 which engages in a recess 18 of a corresponding shape. Moreover, the shaving
unit is supported by the coupling spindle 10 by means of a resilient pressure element,
constructed as a helical spring 20 which for the greater part is situated within
the coupling spindle 10. This helical spring 20, which is compressed between the
coupling spindle 10 and the gear wheel 11, exerts a force on the coupling spindle
which is directed towards the shaving unit 9. This force is transmitted to the
internal shaving member 6 via the coupling spindle 10 and to the external
shaving member 3 via the internal shaving member, so that the rim 21 of
the external shaving member 3 is pressed against the holder 2. The external shaving
member 3, together with the internal shaving member 6 and the coupling spindle
10, can be pressed inwards against the action of the resilient element 20 by external
forces such as those which way occur for example during use of the shaver.
The coupling to the electric motor 14, as described above, is identical
for the three internal shaving members 6 of the apparatus shown in Figs. 1 and
2, in which the three gear wheels 11 mesh with the single central gear wheel 12
on the motor shaft 13.
The internal shaving member 6 is provided with a coupling member
22 (Figs. 3 and 4), for example made of a plastics, comprising three spokes 23
radiating from and interconnected by a central annular portion 24. Between the
spokes coupling apertures 25 are formed. The coupling member 22 partly encloses
the central body 7 of the internal shaving member 6, which is constructed accordingly,
comprising spokes 26 and a central portion 27, which central body 7 is integral
with the cutters 8.
The end of the coupling spindle 10 (Fig. 5) carries three coupling
fingers 28, which in the assembled condition of the apparatus engage in the apertures
25 and whose front faces 29 abut the spokes 23, so that the coupling spindle 10
is coupled to the internal shaving member 6 to rotate this member in the direction
of rotation R. The coupling spindle 10 has a central pressure surface 30 which
bears against the lower surface 31 of the central portion 24. At their ends the
coupling fingers 28 have a slightly pointed shape, their surfaces 32 which are
situated at the rear relative to the direction of rotation R, being inclined. When
the holder with the shaving members is placed onto the apparatus this pointed shape
facilitates entry of the coupling fingers 28 into the apertures 25. In this way
the coupling fingers 28 and the spokes 23 form a so-called claw coupling.
The direction of rotation R of the coupling spindle 10 and the drivable
shaving member 6, which corresponds to the shaving action of this shaving member,
corresponds to a direction of rotation M (Fig. 1) of the electric motor 14. If
the direction of rotation of the motor is reversed, for example by changing the
polarities of the poles, so that an opposite direction of rotation M' is obtained,
the coupling spindles 10 will also be driven in the opposite direction of rotation
R'. The inclined surfaces 32 of the coupling fingers 28 then come into contact
with the spokes 23. As a result of this, the coupling fingers 28 are pressed out
of the apertures 25, so that the coupling spindles are displaced substantially
in a direction away from the shaving members, against the action of the springs
20. By rotating a coupling spindle 10 relative to the associated internal shaving
member 6 the coupling fingers 28 will reach the next apertures 25, causing the
coupling spindle to slip back into an aperture, its pressure surface 30 striking
against the lower surface 31 of the internal shaving member 6.
This process repeats itself, so that in this way the claw coupling
(23, 28) operates as a vibration mechanism which, for example, for a motor speed
of 9000 revolutions per minute and a 5 : 1 reduction ratio between the motor and
the coupling spindle has a frequency of 90 strokes per second. Shaving particles
sticking to the shaving members can be loosened by means of the vibration mechanism,
after which they are collected in the space between the shaving units 9 and the
mounting plate 16. After removal of the holder with the shaving members these shaving
particles can be removed simply from said space by means of a brush. The vibration
mechanism thus provides cleaning of the shaving members, so that these shaving
members have to be cleaned less frequently or not at all. However, the vibrations
will also be transmitted to other parts of the shaving apparatus, so that hair
particles and other contaminants sticking thereto will also come loose as a result
of the vibrations, after which they are easy to remove.
To reverse the direction of rotation of the motor 14 the shaving
apparatus may comprise a separate reversal switch 34 (Fig. 2), adjacent the on/off-switch
It is also possible that, after the apparatus has been switched off,
the motor is re-started automatically, for example electronically, in the reverse
direction of rotation for a short time, for example three seconds.
The invention is particularly suitable for use in shavers in which
the holder 2 can be removed from the apparatus but the shaving units 9 remain mounted
on the apparatus, as is described for example in EP-A-88202108.2 (EP-A-311179).
When the holder has been removed the apparatus can be held above a wash-basin or
dustbin, so that the hair particles are removed immediately once the vibration
mechanism is started.
When the coupling spindle 10 is rotated in the opposite direction
of rotation R' the friction between the internal shaving member 6 and the external
shaving member 3 will generally be adequate to prevent the internal shaving member
6 from being rotated with the coupling spindle 10.
In the embodiment shown in Figs. 6 and 7 corresponding parts bear
the same reference numerals as in Figs. 1 to 5. The apparatus has at least one
shaving unit 9 comprising a rotatable shaving member 6. The apparatus also has
a trimmer which, for simplicity, is not shown, but which is driven by means of
a lever 36 which is pivotable about the spindle 37. One end of the lever 36 is
formed with a slot 38 in which the eccentric 39 is situated. This eccentric 39
may, for example, form part of the hub 17 with the gear wheel 11. Thus, when the
hub 17 is rotated the lever 36 will perform an oscillatory rotation about the spindle
37. The other end has a U-shaped coupling portion 40 to drive a trimmer. This end
also carries a striker 41 comprising an elastic shank 42 and a head 43. By means
of the pin 45, which is slightly depressible against the action of the spring 44,
the shank can be deflected slightly so that the head 43 comes within range of
an anvil 46. This anvil is, for example, integral with the bottom 47 of the collecting
chamber 48 for shaving particles. As a result of the oscillatory rotation of the
lever 36 the head 43 will strike against the anvil 46 with a frequency corresponding
to the speed of the hub 17. Hair particles and other contaminants will come loose
as a result of the action of this vibration mechanism, which simplifies cleaning
of the apparatus. If the strokes of the vibration mechnism (36, 41, 46) are powerful
enough the vibrations will also be transmitted to other parts of the apparatus,
such as the holder 2 with the shaving members 3 and 4.
In another embodiment of a vibration mechanism, which is not shown
in the Figures, one of the rotationally driven parts of the apparatus, for example
the hub 17, comprises projections which are equidistantly spaced along the circumference
of the hub. A slightly elastic pin, corresponding to the pin 45 in Fig. 6, can
be depressed so as to be brought into contact with said projections. During the
rotation the projections strike against the pin, so that again the adjoining parts
of the shaving apparatus are set into vibration and adhering contaminants become