Cutlery – Razors – With cooperating shearing blades
Patent
1990-03-08
1991-12-03
Watts, Douglas D.
Cutlery
Razors
With cooperating shearing blades
30220, 30223, B26B 1902, B26B 1900, B26B 1912
Patent
active
050689665
ABSTRACT:
A blade assembly for electric hair clippers includes a stationary blade having a plurality of teeth arranged in a row, and a reciprocating blade having a plurality of teeth which complement the stationary blade teeth. A cam eccentric which is turned by a shaft attached to a motor moves the reciprocating blade in a back-and-forth motion through a set operating stroke, determined by the lateral distance the cam moves during its rotation. A guide bar maintains the reciprocating blade in a blade guide parallel to the stationary blade throughout the operating stroke, but not through the maximum stroke the blade can travel when the head assembly is removed from the handle for cleaning or other servicing. Anti-lock ribs or an anti-lock bar are provided on the blade guides to engage the guide bar throughout the maximum stroke distance, thereby maintaining the reciprocating blade parallel to the stationary blade throughout the maximum stroke. The blade assembly is removably secured to the handle of the clipper by snaps or the like without the use of screws.
REFERENCES:
patent: 1822262 (1931-09-01), Apple
patent: 1956042 (1934-04-01), Oster
patent: 3031758 (1962-05-01), Wahl et al.
patent: 3093901 (1963-06-01), Wahl et al.
patent: 3093902 (1963-06-01), Andis
patent: 3222782 (1965-12-01), Sadlon
patent: 3233324 (1966-02-01), Derheide
patent: 3430342 (1969-03-01), Wahl et al.
patent: 4498237 (1985-02-01), Mack et al.
patent: 4782592 (1988-11-01), Altamore
patent: 4899444 (1990-02-01), Trichell et al.
Device--Hair Clipper Sold by Wahl Clipper Corp., at least as early as Jul. 24, 1975.
Wahl Gregory S.
Walton William M.
Heyrana Paul M.
Wahl Clipper Corporation
Watts Douglas D.
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