Anticipate This!™ | Patent and Trademark Law Blog

They Invented What? (No. 128)

Posted in They Invented What? by Jake Ward on February 4, 2009

U.S. Pat. No. 5,182,857:  Shaving apparatus.

 lasershave1

What is claimed is:

1. A shaving apparatus comprising a housing (10) and a shear plate (11) with a hair entry slot (24) wherein inside the housing (10) there is provided a device (12) for generating a laser beam (13) which acts as a cutting means and which impinges on the inner side of the shear plate (11) in the proximity of the entry slot (24) where it acts upon and severs the hair, said laser beam (13) impinging on said shear plate (11) and being reflected along the entry slot (24) in a reflecting zone of incidence (23) on the shear plate (11).

2. A shaving apparatus as claimed in claim 1, wherein the laser beam (22) which is reflected from the reflecting zone (23) of incidence is detected by a photo-cell (18) arranged on the inner side of the housing.

3. A shaving apparatus as claimed in claim 2 wherein the photo-cell (18) is connected to a switching device adapted to turn off the laser beam (13).

4. A shaving apparatus as claimed in claim 1 wherein the device (12) generates a laser beam whose frequency substantially corresponds to the absorption frequency of the hair substance.

5. A shaving apparatus as claimed in claim 1 wherein there is provided an optical system by means of which the generated laser beam is directed.

6. A shaving apparatus comprising a housing (10) and a shear plate (11) with a hair entry slot (24) wherein inside the housing (10) there is provided a device (12) for generating a laser beam (13) which acts as a cutting means and which impinges on the inner side of the shear plate (11) in the proximity of the entry slot (24) where it acts upon and severs the hair, there being an angle of incidence .alpha. between the laser beam (13) and the shear plate (11) of between 50.degree. and 85.degree..

7. A shaving apparatus comprising a housing (10) and having upper and lower housing sections and a shear plate (11) with a hair entry slot (24) wherein inside the housing (10) there is provided a device (12) for generating a laser beam (13) which acts as a cutting means and which impinges on the inner side of the shear plate (11) in the proximity of the entry slot (24) where it acts upon and severs the hair, said upper housing section (14) engaging over said lower housing section and the lower housing section being guided in the upper housing section so as to be axially movable against the force of a spring (15).

8. A shaving apparatus comprising a housing (1) and a shear plate (11) with a hair entry slot (24) wherein inside the housing (1) there is provided a device (12) for generating a laser beam (13) which acts as a cutting means and which impinges on and is reflected along the inner side of the shear plate (11) in the proximity of the entry slot (24) where it acts upon and severs the hair, a fan (16) being arranged in the housing.

9. A shaving apparatus as claimed in claim 8, wherein in the housing there is provided a filter device to filter the air drawn into the housing by the fan (16).

10. A shaving apparatus comprising a housing (10) and a shear plate (11) with a hair entry slot (24) wherein inside the housing (10) there is provided a device (12) for generating a laser beam (13) which acts as a cutting means and which impinges on the inner side of the shear plate (11) in the proximity of the entry slot (24) where it acts upon and severs the hair, the generated laser beam (13) being planar and impinging on the shear plate (11) and is reflected along a line parallel to the edge of the entry slot (24).

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