Cutlery – Cutting tools – With blade moving means
Reexamination Certificate
2002-05-10
2003-12-09
Payer, Hwei-Siu (Department: 3724)
Cutlery
Cutting tools
With blade moving means
C056S012700
Reexamination Certificate
active
06658741
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to line trimmers for trimming vegetation, such as weeds and grass, and, more particularly, to line trimmers having a guard mounted thereon.
In the prior art, it is known to mount guards onto line trimmers (as used herein, a “line trimmer” is a hand-held, motorized device having a drive shaft with a rotating cutting head, wherein at least one filament is mounted to the cutting head that is caused to flail upon rotation of the cutting head and used to trim vegetation, such as weeds and grass (e.g., the line trimmer sold under the brand “WEED WHACKER”)).
It is also known to provide a cutting edge on the guards of line trimmers. The cutting edge is disposed in, and generally obliquely to, a plane defined by the flailing of the filament, and acts to clip excessive filament length. In this manner, the cutting edge ensures that the length of the filament does not exceed the size of the guard and, upon rotation, does not extend therebeyond. Examples of such cutting edges are shown in U.S. Pat. No. 4,550,499 to Ruzicka, and U.S. Pat. No. 6,052,976 to Cellini et al.
In U.S. Pat. No. 5,491,962 to Sutliff et al., a line trimmer is disclosed having both flexible filaments and rigid cutting blades mounted to the rotating head. The rigid cutting blades and the flexible filaments are disposed generally parallel with the flexible filaments being located above the cutting blades; the flexible filaments and the rigid cutting blades are vertically aligned. With two sets of rotating cutting elements in the Sutliff et al. device, vegetation is simultaneously double-cut upon engagement of the blades and filaments and, in effect, mulched.
It is an object of the subject invention to provide a line trimmer having a cutting member with at least one rigid knife edge disposed on a guard that is non-rotatably mounted onto the line trimmer.
It is also an object of the subject invention to provide a line trimmer having a cutting member with at least one rigid knife edge disposed on a guard, with the knife edge being spaced from a plane defined by the flailing of a filament upon rotation of the cutting head.
SUMMARY OF THE INVENTION
The aforementioned objects are met by a line trimmer having a guard mounted thereto, with a cutting member having at least one rigid knife edge being disposed on the guard. The line trimmer also includes at least one filament which flails upon rotation of the cutting head. The knife edge is spaced from any plane defined by the flailing filament(s). Advantageously, the knife edge cuts vegetation in concert with the filament(s). As a variation, the cutting member may include a second knife edge which is disposed to pass through the plane(s) defined by the flailing filament(s) so as to trim excess length of the filament(s). Accordingly, the filament(s) will not extend beyond the guard of the line trimmer while flailing.
These and other features will be better understood through a study of the following detailed description and accompanying drawings.
REFERENCES:
patent: 4550499 (1985-11-01), Ruzicka
patent: 4651422 (1987-03-01), Everts
patent: 4653256 (1987-03-01), Saiia
patent: 4905465 (1990-03-01), Jones et al.
patent: 4916886 (1990-04-01), Nakamura et al.
patent: 5048187 (1991-09-01), Ryan
patent: 5077898 (1992-01-01), Hartwig
patent: 5293734 (1994-03-01), Mills
patent: 5351403 (1994-10-01), Becker et al.
patent: 5423126 (1995-06-01), Byrne
patent: 5491962 (1996-02-01), Sutliff et al.
patent: 6052976 (2000-04-01), Cellini et al.
Budzyn Ludomir A.
Payer Hwei-Siu
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