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Title:
ELECTRICALLY OPERATED SHAVING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2010/150214
Kind Code:
A1
Abstract:
The invention relates to an electrically operated shaving apparatus (1) having at least one cutting device that can move in or out in a first guide path (19) by means of a sliding switch (9) on a shaver casing (2). The cutting device consists of a blade casing (18) and a long hair cutter (20) on the blade casing (18) that is fed into a second guide path (20) which can be driven by a drive mechanism. Between the shaver casing (2) and the long hair cutter (10) is situated a transmission mechanism (21) that enlarges the displacement path (b) of the long hair cutter (10). According to the invention, the transmission mechanism (21) consists on the one hand of a fixed stop (31) attached to the shaver casing (2) and, on the other hand, to a sliding element (24) that can be slid crosswise to the displacement path (d) of the long hair cutter (10) into a third guide path (22). The sliding element operates in connection with the stop (31) by means of a ramp (26) attached to the sliding element (24) and tilted at an angle alpha vis-a-vis the sliding direction. The sliding element (24) is connected by means of a deflection device (25) to the casing part (17) of the long hair cutter (10). The invention provides for the creation of a transmission mechanism (21) that is very easy to manufacture and has very few components that enables the long hair cutter (10) to be lifted out quickly with little movement on the sliding switch (9).

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Inventors:
ERNDT, Andreas (Marienburger Strasse 5, Kelkheim, 65799, DE)
PIESKER, Thorsten (Castillostrasse 12, Bad Homburg, 61348, DE)
STIMPEL, Johannes (Bommersheimer Weg 50, Bad Homburg, 61348, DE)
SALOMEZ, Nicolas (Richard-Wagner-Strasse 22, Eschborn, 65760, DE)
DIETZEL, Daniel (Hornauer Strasse 43, Kelkheim, 65779, DE)
LUDAESCHER, Uwe (Sauerstrasse 51, Frankfurt, 65934, DE)
MATERN, Matthias (Rossertstrasse 11, Steinbach, 61449, DE)
Application Number:
IB2010/052870
Publication Date:
December 29, 2010
Filing Date:
June 23, 2010
Export Citation:
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Assignee:
BRAUN GMBH (Frankfurter Strasse 145, Kronberg/Taunus, 61476, DE)
ERNDT, Andreas (Marienburger Strasse 5, Kelkheim, 65799, DE)
PIESKER, Thorsten (Castillostrasse 12, Bad Homburg, 61348, DE)
STIMPEL, Johannes (Bommersheimer Weg 50, Bad Homburg, 61348, DE)
SALOMEZ, Nicolas (Richard-Wagner-Strasse 22, Eschborn, 65760, DE)
DIETZEL, Daniel (Hornauer Strasse 43, Kelkheim, 65779, DE)
LUDAESCHER, Uwe (Sauerstrasse 51, Frankfurt, 65934, DE)
MATERN, Matthias (Rossertstrasse 11, Steinbach, 61449, DE)
International Classes:
B26B19/10
Attorney, Agent or Firm:
BRAUN GMBH (Services 299 East Sixth Street SycamoreBuilding, 4th Floo, Cincinnati Ohio, 45202, US)
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Claims:
CLAIMS

What is claimed is:

1. Electrically operated shaving apparatus (1) having at least one short hair cutter (41) attached to a shaver housing and a long hair cutter or trimmer that can move in or out by means of a sliding switch (9) on a first guide path (19), which cutter or trimmer is pre-mounted on the short hair cutter (41) and which consists of a blade casing (18), and a casing part (17) fed into a second guide path (20) on the blade casing (18) to which a top and bottom blade can be driven relative to each other by an electric drive mechanism, wherein between the shaver casing (2) and the long hair cutter (10) is situated a transmission mechanism (21) that enlarges the displacement path (b) of the long hair cutter (10), characterized in that the transmission mechanism (21) consists on the one hand of a fixed stop (21) attached to the shaver casing (2) and, on the other hand, of a sliding element (24) that can be slid crosswise to the second guide path (20) of the long hair cutter (10) into a third guide path (22), that the sliding element (24) operates in connection with the stop (31 ) by means of a ramp (26) attached to the sliding element (24) and tilted at an angle (α) vis-a-vis the sliding direction (R), and that the sliding element (24) is connected by means of a deflection device (25) to the casing part (17) of the long hair cutter (10).

2. Shaving apparatus according to Claim 1, characterized in that the deflection device consists of a second sliding element (25), that the second sliding element (25) runs in the second guide paths (20) and that the second sliding element (25) is in sliding contact across sliding surfaces (27, 28) with the first sliding element

(24).

3. Shaving apparatus according to Claim 2, characterized in that the two sliding surfaces (27, 28) run parallel to each other and form an angle β of 45° vis-a-vis the sliding direction of the guide path (22).

4. Shaving apparatus according to Claim 1 , characterized in that the deflection device (25) consists of a flexible band attached to a first sliding element (24), which band is forcibly fed into the guide paths (22, 20).

5. Shaving apparatus according to Claim 1, characterized in that the deflection device (25) is acted upon by a return spring (30).

6. Shaving apparatus according to Claim 1, characterized in that the guide paths (20, 22) are formed by holes running lengthwise in the cross section, into which holes the sliding elements (24, 25) can be slid lengthwise in a precise manner.

Description:
ELECTRICALLY OPERATED SHAVING APPARATUS

The invention relates to an electric shaving apparatus according to the preamble of Claim 1.

Known from DE 37 29 257 C2, DE 21 22 944 A, DE 41 17 988 C2 and DE 43 36 231 Cl are electrically operated shaving apparatuses such as those described in the preamble. The shaving apparatuses described therein have, in addition to a short hair cutter, a long hair cutter pre-mounted in front of the short hair cutter. To be operational, the long hair cutter can be lifted out of its casing by means of a sliding switch. In the process it partially or completely covers the short hair cutter from back to front so that a better contact with the skin surface of the operator can henceforth be made, primarily when shaving. When switching on the long hair cutter, advantageously the electric drive mechanism of the short hair cutter is first switched on and, as the long hair cutter continues to slide, the latter is coupled with the drive mechanism by means of the transmission mechanism. This obviates the need for an additional drive for the long hair cutter.

Situated between the sliding switch and the long hair cutter are transmission mechanisms, the operation of which increases the distance covered by the long hair cutter on the sliding switch. This has the advantage that the distance covered on the sliding switch can be made relatively small in relation to the distance covered by the long hair cutter by the hand of the operator; this simplifies and improves the operability of the shaving apparatus.

In DE 37 29 257 C2, the transmission mechanism consists of gear racks situated both on the shaver casing and on the blade casing. By means of gear wheels situated on the sliding switch, the gear racks achieve a certain distance as the gears engage. As the sliding switch is moved further along, the sliding distance of the long hair cutter increases in accordance with the gear transmission. Known from both DE 21 22 944 A and DE 43 36 231 Cl is a transmission mechanism for accelerating the lifting out of the long hair cutter; it essentially consists of a two-arm lever that can pivot around a rotating axis fixed to the casing. With the help of the lever transmission, the displacement path of the long hair cutter initiated on the sliding switch increases accordingly.

Correspondingly, this also applies to the electrically operated shaving apparatus according to DE 41 17 988 C2. But in this case, instead of using a double-arm lever as a transmission mechanism, a coupling mechanism is used in which three interconnected lever arms provide for transmission to the long hair cutter. At the same time, the coupling mechanism is designed in such a way that, first, the long hair cutter moves in a straight line when the sliding switch is activated. Only after a certain starting distance in the event of a further movement of the sliding switch does displacement to the long hair cutter take place; i.e., the displacement path to the sliding switch moves is less than that of the long hair cutter. This transmission can even reverse to a reduction if slid further.

The above-described transmission mechanisms have the disadvantage that they are relatively difficult and time-consuming to build and also have a relatively high number of components, which makes them cost more to manufacture. In addition, the relatively high number of components endangers functional reliability, which can lead to unwanted repairs.

Therefore, the problem of the invention is to avoid the above disadvantages and to design a transmission mechanism that can be made with a very simple and stable construction, while keeping the complexity of the components and the costs very low.

According to the invention, this problem is solved by the characterizing features of Claim 1. Thus, as a result of the use of an adjustable sliding element mounted in the long hair cutter, which by means of a ramp is in sliding contact with a stop solidly attached to the shaver casing, this sliding element slides sideways when the sliding switch of this sliding element is pushed and transmits this displacement path directly to the long hair cutter by means of a displacement device. Thus, on the one hand the long hair cutter displaces the path of the sliding switch and on the other hand also displaces another path superimposed by the ramp arrangement. This increased path accelerates the removal of the long hair cutter from the shaver casing, which simplifies and/or improves the operability of the shaver. Of course, the stop can be arranged on any part of the shaver casing but it must be solidly fixed in place vis-a-vis the sliding element.

At the same time, the stop can be situated on the shaver casing so that the sliding switch only reaches the stop on the ramp of the sliding element after a starting distance of the sliding switch, so that the additional distance to the long hair cutter only commences after that. However, it is also conceivable that the stop is already in the starting position of the sliding switch on the ramp and already provides a greater distance to the long hair cutter during the initial movement of the sliding switch. Any mechanical or hydraulic variant can be used for the design of the displacement device; the only important thing is that the displacement path running perpendicular to the sliding direction of the sliding switch on the sliding element is in turn redirected in the perpendicular direction; i.e., is in turn redirected in the direction of the sliding switch on the long hair cutter.

According to the features of Claim 2, the displacement device consists of a second sliding element that preferably runs in the second guide path and/or is also fed into a separate, fourth guide path running parallel to the second guide path, wherein the second sliding element is in sliding contact with the first sliding element by means of sliding surfaces running aslant to the guide paths. The interacting sliding surfaces must therefore be arranged so that, depending on the materials of the sliding elements, dynamic friction is always formed on the sliding surfaces. Preferably chosen as sliding elements are plastic parts that are easily manufactured and have very low slip values. However, metallic materials having good dry-running properties are also conceivable. The physical design of the guide paths is adjusted to the sliding surfaces of the sliding elements. In other words, in the case of a polygon as a sliding element, the guide path is also formed by a polygonal shaft or by walls that lend the sliding element a coercive sliding guide in only one sliding direction. For example, if a circular cross section is chosen as a sliding element, a hole can be chosen as a guide path into which is mounted the adjustable sliding element. Because of the stop and the first ramp on the first sliding element, when the sliding switch is pushed, the first sliding element is pushed diagonally to push the sliding switch into the third guide path of the long hair cutter. On the second and third ramps, this movement is in turn deflected at a 90° angle to the second sliding element, all or one part of which is directly attached to the casing of the long hair cutter. This causes the entire long hair cutter to then be quickly removed from the shaver casing via the third guide path in the direction of the movement of the sliding switch.

According to the features of Claim 3, the sliding surfaces form a ramp angle of 45°. In this manner, the sliding switch distance is doubled by means of the transmission mechanism, which then causes the long hair cutter also to travel twice the distance. However, other ramp angles that maintain dynamic friction are also conceivable; the only important thing is that the operating force on the sliding switch is not too great.

According to the features of Claim 4, the deflection device consist of a flexible band attached to a first sliding element that is forcibly led into the third and a fourth or a fifth guide path. This forcible guiding is necessary so that the movement exercised by the first sliding element on the deflection device is transmitted directly onto the deflection device of the long hair cutter without shortening the distance or distorting the shape. Suitable as a guide path when choosing the deflection device as a flexible or otherwise rigid band is a groove arrangement adjusted to the band in a cross section in which the band can be moved free of play.

According to the features of Claim 5, the deflection device is acted upon by a return spring. This return spring preferably attaches, on the one hand, to the second sliding element and, on the other hand, to the casing of the long hair cutter and is pre- stressed so that after the sliding switch is returned to its starting position, the sliding elements also return to their starting positions.

The drawing shows one exemplary embodiment of the invention, which is explained in detail below.

Fig. 1 shows a perspective drawing from the front right side of an electrically operated shaving apparatus having a short hair cutter and a pre-mounted long hair cutter, wherein the long hair cutter is shown in its starting position.

Fig. 2 shows a perspective partial view from the front of a long hair cutter attached to a shaver casing (only part of which is shown) in its starting position having a sliding switch according to the invention, wherein the long hair cutter is only indicated.

Fig. 3 shows a partial view according to Fig. 2, but in this instance only the sliding switch and the long hair cutter are shown in their maximum positions traveled from or to the shaver casing.

Fig. 4 shows a sketch-like schematic diagram of a transmission mechanism shown in a sectional view according to the invention, wherein the sliding switch and thus the long hair cutter are shown in their starting positions.

Fig. 5 shows a corresponding drawing to Fig. 4, but in this instance the long hair cutter is shown is its maximum final position (maximum operating position) from or to the shaver casing.

According to Fig. 1 , the electrically operated shaving apparatus 1 consists of a rectangular shaver casing 2. On its top front end between two holding devices hangs a pivotable shaving head frame 5 around a swivel axis 15. Attached to shaving head frame 5 is a shaving foil 6 on which lies a bottom blade (not shown in the drawing) that slides in and out. A drive motor (not shown in the drawing) oscillates the bottom blade in and out; the oscillations run parallel to the swivel axis 15. In this manner, hair (not shown) that penetrates the bottom blade via the holes 7 in the shaving foil 6 is sheared or cut off by the bottom blade. The shaving head frame 5, along with the shaving foil 6, the bottom blade and the integrated drive technology (not shown), forms the short hair cutter 41 of the shaving apparatus 1.

According to Figure 1 , in the middle of the front side 8 of the shaver casing 2 is mounted an adjustable sliding switch 9 that moves in the displacement direction V. The displacement direction V runs perpendicular to the swivel axis 15, i.e. in the longitudinal direction of the shaver casing 2, from top to bottom and vice versa. The sliding switch 9 is connected by means of a transmission mechanism (not shown in Fig. 1) to an adjustable long hair cutter 10 arranged beneath the short hair cutter 41. The long hair cutter 10 consists of a comb-like top blade 11 having teeth arranged next to one another 42, underneath which is attached a correspondingly designed sliding bottom blade 12 having teeth 43. Top and bottom blades 11 and 12 with their comb-like teeth 42 and 43 run essentially perpendicular to the front side 8 and parallel to the swivel axis 15 and protrude a little in front of the casing part 17 of the long hair cutter 10. However, the cutting device of the long hair cutter 10 can be of any design that is also related to the embodiments in Figures 2 through 5.

According to Figure 1 , on the side surfaces of the holding device 3 and 4 are embedded operating buttons 13 that can be pushed; pushing them unlocks and thus releases the shaving foil 6 from the shaving head frame 5. On the sliding switch 9 is an actuating cross-piece 16 that extends forward; it acts as a stop for the thumb of the operator and thus makes it easier to move the sliding switch 9. In Figures 2 and 3, a view from the front shows a second exemplary embodiment of a long hair cutter 10 attached to a shaver casing 2 with a top blade 11. This long hair cutter also can also be lifted out or in in relation to the shaver casing by means of a sliding switch 9. The same position numbers used in Figure 1 were used for the equivalent components in Figures 2 through 5. The sliding switch 9 is connected to the long hair cutter 10 by a transmission mechanism (Figures 4 and 5 - not shown). The long hair cutter 10 is connected to the blade casing 18 by means of a casing part 17; the blade casing 18 is integrated with the sliding switch 9. The blade casing 18 slides lengthwise over a first guide arrangement 19 into the shaver casing 2 (displacement direction V), whereas the long hair cutter 10 is moved up and down in the same direction over a second guide path 20, either solely into the blade casing 18 and/or partially also into the shaver casing 2.

Figures 4 and 5 show a sketch-like partial sectional drawing of the transmission mechanism 21 according to the invention. Situated in the blade casing 18 are two guide paths 20 and 22 that stand perpendicular to each other, into each of which is fed a sliding element 24, 25. The lower sliding element 24 can, according to Figures 2 through 5, be slid in a horizontal direction, i.e. in a direction perpendicular to the sliding switch 9, while the sliding element 25 running perpendicular to it can be slid parallel to the displacement direction V from bottom to top and back. In each case, on the front side of the sliding element 24 are attached ramps 26 and 27, wherein the right ramp 26 runs from the top left side to the bottom right side, thus constituting a decline, while the left ramp runs from the top right side to the bottom left side, thus constituting an incline. In Figure 5, a possible extension of the ramps 26 and 27 forms an intersection point C whose included angle is preferably 90°. Thus, the ramp angles α, β and γ are preferably 45°. However, other angles are conceivable, depending on the friction coefficients of the sliding elements 24 and 25. The only important thing is that no self-inhibition takes place when the sliding element 25 is slid by the sliding element 24 because then the sliding elements 24 and 25 cannot be slid through the ramps 26, 27 and 28, or only with a great deal of effort. The ramp angles α, β and γ are defined by the sides of the ramps 26, 27 and 28 and the movement and/or sliding directions R and S of the sliding elements 24 and 25. The sliding direction S runs parallel to the displacement direction V and the sliding direction R runs diagonal to it.

The left ramp 27 is flush with the ramp 28, which is part of the sliding element 25. The sliding element 25 is connected to the long hair cutter 10 mechanically or in one piece. The sliding element 25 is connected by means of a lever arm 29 attached to it to a tension spring 30 that for its part is attached to the blade casing 18 on another end. Fig. 4 only sketches in this tension spring 30 and is only intended to suggest that the sliding element is always returned as soon as the sliding switch 9 also returns [to its original position]. In this case as well, many equivalent solutions for a return mechanism are possible but in the interest of simplicity they are not mentioned here.

The sliding elements 24 and 25 are fed into the sliding surfaces 35 and 36, which face each other, so that they do not tilt in their guide paths 22 and 23. In particular, it is important that the sliding elements 24 and 25 can easily slide over their sliding surfaces 38 and 39 into the sliding surfaces 35 and 36 of the related guide paths 22 and 23. Suitable as materials for this purpose are especially good plastics that can slide into plastic paths easily, even without lubricants. According to Figures 4 and 5, the sliding surfaces 35 and 36 have several raised areas that together form the respective guide paths 22 and 23 for the sliding elements 24 and 25. The gaps 44 and 45 that lie in between save material, reduce the cost of production and, moreover, improve sliding properties.

The mode of action of the shaving apparatus according to the invention is as follows:

When the sliding switch 9 is moved from its starting position to a first position, the short hair cutter 41 is activated by switching on the electric drive motor (not shown), which allows short hair to now be cut on a shaver surface. If the sliding switch 9 is now raised to another position, an adjustable shaving head frame 5 (Figure 1) stops it. Otherwise, at the same time the long hair cutter 10 is lifted out a little (without deflection), which simultaneously sets it into motion; i.e., the bottom blade 12 becomes mechanically connected to the drive mechanism of the short hair cutting system. In this second position according to Fig. 4, the sliding element 24 has now reached the position shown here vis-a-vis the stop 31; i.e., the top end of the ramp 26 has reached the stop 31. The stop 31 , shown in Figure 4 as a dotted line, takes the starting position. In the second position of the long hair cutter 10, short hair can be cut with the short hair cutter 41 and long hair can be cut with the long hair cutter 10; thus, a combined shave.

If the sliding switch 9 is now brought to a third position, by sliding the sliding switch 9 the sliding element 24 is slid to the left in accordance with the sliding direction R into the guide path 22 until it has reached the position shown in Fig. 5. As the sliding switch 9 is slid, the ramp 26 at the same time slides alongside the fixed stop 31 and presses the sliding element to the left. At the same time, the ramp 28 of the sliding element 25 slides up alongside the ramp 27 of the sliding element 24 and is pushed up in the sliding direction S into the guide path 20, as shown in Fig. 5. Thus, the distance of the path of the sliding switch 9 to the long hair cutter 10 is added to the greater distance caused by the transmission mechanism 21 ; i.e., at an angle of α, β and γ of 45°, the distance traveled by the long hair cutter 10 is twice the distance traveled by the sliding switch 9 because s = d/cos α, and because cos 45° = 1 and s = d. This doubling of the distance traveled by the long hair cutter 10 allows it to move very rapidly and far away from the shaver casing 2 in the event the displacement path of the sliding switch 9 is small, making it easier and simpler to use. Only the long hair cutter 10 is now utilized because it stands far above the short hair cutter 41, which can no longer touch the surface of the skin. Greater ramp angles α, β and γ would make greater displacement of the long hair cutter possible, but more effort would be required to slide the sliding switch 9.

Moving the sliding switch 9 back then to its position 2 slides the guide path 22, along with the sliding element 24, down. This allows the sliding element 24 to move to the right, but only so far as the stop 31 makes this possible by sliding alongside the ramp 26. The backwards movement of the sliding element 24 is possible because the tension spring 30 presses the sliding element 25 down against the sliding direction S with pre- stressing and at the same time, the sliding element 24 is again pressed to the right by means of the ramp arrangement 27, 28 to the extent permitted by the stop 31. When the sliding switch 9 is again placed in the second position shown in Fig. 4, the long hair cutter 10 is decoupled from the drive mechanism and a close shave using the shaving foil 6 is again possible. Finally, place the sliding switch 9 back in its starting position switches the drive mechanism off, which prevents any further power transmission into the transmission mechanism 2. This removes the sliding element 24 further from the stop 31, which then again assumes, roughly, the position shown in Fig. 4 by the dotted line. The individual operating positions of the sliding switch 9 can be advantageously fixed by latches that can be removed individually (not shown) so that the long hair cutter 10 always maintains its position during the shaving process.

Of course, it is also conceivable to decouple the transmission mechanism 21 according to the invention from the on/off switch, as is disclosed in DE 4117988 C2. When it is slid out of the starting position into its first position, the sliding switch 9 then causes the long hair cutter 10 to travel twice as far out of the shaver casing 2. This connects the long hair cutter 10 mechanically to the drive mechanism and/or simultaneously switches it on when it moves and connects [the drive mechanism?] to the long hair cutter 10.