Cutlery – Razors – Combined
Reexamination Certificate
2003-02-21
2003-09-23
Watts, Douglas D. (Department: 3724)
Cutlery
Razors
Combined
Reexamination Certificate
active
06622385
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
Rotary electric shavers having a plurality of planetary, rotating cutting heads and a hair trimming attachment.
SUMMARY OF THE INVENTION
The present invention arose as a result of the absence in prior art of a means for producing the reciprocating motion required to operate a pop-up trimmer in an electric shaver with rotary cutting heads that are in planetary motion. The conventional drive means for operating a pop-up trimmer cannot be utilized in such shavers because the cutting heads and drive gear assemblies are mounted on a rotating frame within the stationary body of the shaver.
In current practice, the drive means for a pop-up trimmer consists of a hinged cam that surrounds the offset axis of a cutting head drive gear to produce a reciprocating motion that drives the cutting elements of the trimmer. In the present invention, protrusions on the surface of the rotating frame consecutively move a hinged cam to provide the reciprocal motion required for the operation of a pop-up trimmer.
REFERENCES:
patent: 3392443 (1968-07-01), Kawano et al.
patent: 3552007 (1971-01-01), Yamada
patent: 3781990 (1974-01-01), Loner
patent: 4355464 (1982-10-01), Bergsma
patent: 4649642 (1987-03-01), Nagasaki et al.
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