Cutlery – Razors – Combined
Patent
1993-11-30
1995-06-13
Watts, Douglas D.
Cutlery
Razors
Combined
30 4392, B62B 1910, B62B 1938
Patent
active
054231256
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an electric shaving apparatus having at least one short-hair cutter assembly arranged on a housing and at least one control switch slidably mounted on the housing for setting a long-hair trimmer assembly from an "Off" position to at least one operating position, with at least one switching member being operatively associated with at least one of the cutter assemblies through a transmission means.
An electric shaver with short-hair cutter assemblies arranged on a housing and a control switch slidably mounted on the housing for adjusting a long-hair trimmer assembly is already known U.S. Pat. No. 4,941,259. For adjusting the long-hair trimmer assembly, the shaver includes a control switch with a transmission ratio, so that in this configuration of the control switch relatively long lengths of actuator travel must be covered to adjust the long-hair trimmer assembly.
In another known shaver (DE 31 11 871 A1), the coupling function between a slide means and a long-hair trimmer assembly is performed by a transmission means in order that the long-hair trimmer assembly travel double the length the slide means travels when actuated. As a transmission means, a fairly complicated, trouble-prone thrust tie-rod device is provided.
Accordingly, it is an object of the present invention to configure the control switch and the transmission elements between the control switch and the long-hair trimmer assembly by simple constructional means such as to enable the length of contact travel of the control switch required for adjusting the long-hair trimmer assembly to be reduced.
According to the present invention, this object is accomplished in that at least the control switch is operatively associated with at least one of the cutter assemblies by means of a multi-linkage mechanism reducing the length of contact travel. As a result, the transmission means provides in a simple and economical manner a driving connection between the control switch and the cutter assembly which affords great ease of motion, produces large transmission ratios, and reduces the normally very long length of contact travel of the control switch significantly.
A further essential advantage of the present invention resides in that the control switch for the long-hair trimmer covers constant lengths of contact travel, while the associated slide means of the long-hair trimmer assembly may cover different lengths of contact travel suited to the individual application. This results in a substantial improvement of the operating comfort and the manipulation of the shaver for its user.
Further, the use of a coupler mechanism reduces the actuating and friction forces to a minimum. To this end, it is advantageous to configure the transmission means as a coupler mechanism. By installing a coupler mechanism, a minimum of space is required in the shaver housing to accommodate therein a transmission means with a high transmission ratio. Still further, the coupler mechanism may be readily configured such as to describe with its coupler point a coupler curve composed of a straight-line segment and a curved segment. A curved motion of at least one transmission member is thereby readily convertible into a straight-line motion without necessitating a larger space for accommodating the transmission means. The coupler mechanism further enables variable transmission ratios to be accomplished which are adapted to the individual application.
In a further feature of the device of the present invention, an additional possibility is afforded in that the coupler mechanism includes a pin arranged in the area of its coupler point, the pin extending on a straight-line segment over one area, while extending on the curved segment of the coupler curve over another area.
Still further, the coupler mechanism advantageously includes a rocking member having its one end connected to the coupler by means of a hinge pin, while its other end is connected to a stationary point in the housing, and the coupler mechanism includes a crank having its one end connected to the
REFERENCES:
patent: 3780434 (1973-12-01), deBoer et al.
patent: 4505036 (1985-03-01), Ochiai et al.
Braun Aktiengesellschaft
Watts Douglas D.
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