Electric dry razor

Details Electric dry razor Electric dry razor

2000-03-24

2001-10-16

Watts, Douglas D. (Department: 3724)

Cutlery

Razors

With cooperating shearing blades

C030S527000

Reexamination Certificate

active

06301786

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a dry shaver including at least one shaving blade which is arranged in a pivotable head frame closed on its sides and cooperates with cutters oscillating in the longitudinal direction of the shaving blades, wherein the shaver head is detachably connected with the base part including the driving mechanism.
2. Prior Art
Dry shavers are known in various configurations. Besides dry shavers comprising rotating cutters, in which the shaving blades having relatively small diameters are resiliently arranged in a head frame, dry shavers are above all known, in which a driving motor is arranged in a base part and coupled with one or several cutter blade blocks or lamella carriers, whereby the lamellae or cutter blades of the cutter blade blocks or lamella carriers are set in an oscillating movement. The direction of oscillation of such cutter blade blocks extends in the direction of the axis of the enveloping curve of the lamellae, wherein said lamellae or cutter blades cooperate with shaving blades which, in turn, may be designed in a curved manner, too. The curvature of the shaving blades follows the enveloping curve or enveloping surface of the lamellae or cutter edges, the length of such a shaving blade being measured in the axial direction of the curvature of the enveloping surface. A plurality of such cutter blade blocks may be driven in parallel to carry out an oscillating movement in same direction or in opposite direction, wherein the shaving blade comprises a corresponding plurality of curved surfaces cooperating with the enveloping surfaces of the lamellae. The shaving blade, as a rule, is arranged in a head frame and may be removed together with the head frame for the purpose of cleaning. To this end, the head frame is detached from the base part, wherein, as a rule, at least the shaving blade is separated from the base part together with the head frame. After this, the oscillating cutters of the cutter blade blocks and the shaving blade can be cleaned separately, whereupon the operating condition may be restored by simple assemblage. In addition to those configurations, configurations have been known, in which the cutter blade blocks are mounted in the head frame and are removed along with the head frame. In such configurations cleaning is somewhat more cumbersome.
The known configurations or arrangements of shaving blades and cutter blade blocks allow for a certain degree of elastic resilience. Both the relatively thin-walled shaving blade, which is elastically deformable, and the cutter blade block, which is resiliently connected with the driving mechanism, may yield under compressive stress, said yielding movement serving to enhance adaptation to the skin to be shaved. Such yielding movements are, however, delimited by the boundary edges of the head frame. In order to enable a better adaptation to the contour of the skin, it is known to connect the head frame, together with the shaving blade and the oscillating cutters, with the base part in a pivotable manner, whereby a pivot axis is provided in the known configurations, which extends substantially parallel with the axis of the enveloping surface of the lamellae, or the axis of the curvature of the shaving blade. That pivotability in the event of several cutter blade blocks set in parallel oscillation, in the first place, serves to getting a plurality of such cutter blade blocks and shaving blades into an operating position at the same time. Depending on the length of the shaving blades, an application behavior that varies over the length of the shaving blade will, however, result from the varying contour of the skin, which must be compensated for by the user of such a dry shaver by constantly orienting the base part, and hence the shaving blades, in a suitable manner. In the extreme case, only a portion of the length of the shaving blades is in active engagement with the skin to be shaved such that the time necessary for a smooth shave is substantially increased, requiring appropriate corrections several times.
SUMMARY OF THE INVENTION
The invention aims to equalize the application pressure of shaving blades and oscillating cutter blades at different contours of the skin without involving frequent corrections of the angular position of the base part relative to the skin and to provide a configuration that enables the optimum adaptation of the cutter head to the contour of the skin without requiring an increased attention by the user of the shaver and without calling for elevated cleaning expenses. To solve this object, the configuration according to the invention essentially consists in that the head frame is designed in two parts, wherein the outer head part carrying the shaving blade(s) is connected with the part of the head frame that is detachably fixed to the base part, about an approximately central pivot axis extending transverse to the oscillation direction of the cutters. Due to the fact that the head frame, which is closed on its sides, is designed in two parts and the respectively outer part of the head frame is pivotably hinged to the first part of the head frame, which is detachably fixed to the base part of the shaver, a closed configuration is provided, which can be removed from the base part as a unit and is easy to clean. At the same time, the pivotability of the outer part of the head frame ensures that an accordingly high pivotability is feasible without the skin colliding with the edges of the head frame and thereby impeding the pivotal movement of the shaving blade and of the lamellae. By removing the entire two-part head frame, at least the shaving blade can be separated from the base part and from the lamella block so as to enable simple cleaning. When pivoting the outer head part, also the external edges of the outer head part are always pivoted simultaneously therewith such that the pivotal movement will in no way be impeded by the head frame and an accordingly large pivot angle will be available.
Sealing of the two parts of the head frame relative to each other may be effected in a conventional and particularly simple manner with the configuration being devised such that the pivotable outer head part is connected with the head part detachably fixed to the base part, via sealing surfaces or packings. While the pivotability of the shaving blade within the head frame as a function of the pivoted position always involves more or less large passage openings for the cut hairs of a beard and hence a high risk of choking, the closed configuration comprising a pivotable outer head part connected via sealing surfaces or packings with the head part detachably fixed to the base part results in the cut hairs of the beard being safely received in the interior of the head frame so as to be readily removed upon removal of the entire head frame, easy cleaning of the shaving blades and of the cutters, thus, being feasible.
Advantageously, the configuration according to the invention is devised such that the pivot axis of a cutter-carrying block and the pivot axis of the outer head part are located in a longitudinal center plane of the base part. With such an arrangement of the pivot axis and, in particular, in an arrangement in which the pivot axis of a cutter-carrying block and the pivot axis of the outer head part register with each other, the resilient connection between the cutter block and the driving mechanism substantially is stressed in the same manner as in conventional designs with additional forces being avoided.
The relatively high pivotability of the outer head part relative to the head part that is detachably fixed to the base part may be delimited in a simple manner, wherein the configuration preferably is devised such that the pivotability of the pivotable outer head part is delimited by stops on the head part that is detachably fixed to the base part.
Resetting of the pivotable outer part of the head frame into a position substantially parallel with the upper edge of the base part may be realized by the aid of sprin

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