Cutlery – Cutting tools – Plural cooperating blades
Reexamination Certificate
2000-02-28
2001-10-23
Payer, Hwei-Siu (Department: 3724)
Cutlery
Cutting tools
Plural cooperating blades
C030S357000, C076S106500
Reexamination Certificate
active
06305088
ABSTRACT:
BACKGROUND
1. Field of Invention
This invention relates to an improvement in scissor blade safety, specifically to the scissor blade's cutting edge location. Relative the leading, front portion of the blade, and to the shape of the leading portion taken in the direction of the cutting stroke. Application
2. Discussion of Prior Art
All prior art scissors found by inventor easily cut skin, flesh, because the first portion of the blade is the cutting edge. Self use of scissors for cutting hair in hard-to-see areas of body is a dangerous act. No prior art provides a suitable safeguard along the cutting edge to mitigate harm by a person in difficult to reach or to see for self-use. No safeguard exists for young children's use of scissors.
All prior art cutting edge angles of sharpness are ground with potentially sharp, reflex cutting angles ranging from the least sharp angles of 270 degrees to beyond the very sharp 330 degrees, even close to razor sharpness angles. All angles were taken at distances out from the cutting edge measured within one millimeter (mm) of edge.
This invention provides less sharp, safeguard blade structure for sharpness cutting angles under 270 degrees.
SUMMARY
The invention provides scissor blade structure for safeguard blade protuberances arranged in front of the cutting edge, in the cutting stroke direction of the blade, and extending substantially parallel and substantially the length of the cutting edge. The protuberance provides the guarding by pressing against skin or flesh substantially prior to the sharp cutting edge reaching the skin or work piece, which may include flesh. This protruding structure creates sensitivity when it touches skin, whereby continued or increasing pressure is perceived by the user as harmful.
The structure also provides many different scissor blade cutting edge angles of sharpness that are far safer than the 270 degrees and higher degree angles common to prior art scissors.
The combinations of these different angles with the different areas and positions of the protuberances provide a multiplicity of scissor blade shapes, lengths, and resulting uses the prior art cannot meet with the great protective safety of this new scissor art.
The invention also provides a very cost-effective method for manufacturing each of the new arrangements resulting from combining different cutting edges and protuberant shapes, simultaneously with one grinding in most configurations.
This method also generally applies for modifying the many different prior art blade shapes before original sharpening or after original sharpening by creating the new protuberances and cutting edge physical features of the apparatus claims.
OBJECTS AND ADVANTAGES
The main object of this invention is to provide, for the first time, improved safety in the use of scissors close and on human skin, flesh by greatly mintigating the prior art usual pinching and cutting of tender, soft, uneven skin by sharp cutting edges when children use scissors, and when adult users cut their own hair in difficult-to-reach, unseen areas such as in the nose, ear, and behind the neck.
Other objects include: these same scissors with safety protective features also are able to easily and effectively cut paper, cloth, hair, and other work pieces while having the sizes, weights, and handling characteristics of typical types of scissors in the prior art.
Further objects and advantages of my invention will become apparent from study of the drawings and specification.
REFERENCES:
patent: 3196540 (1965-07-01), Porzky
patent: 3325897 (1967-06-01), Luebkeman
patent: 4422240 (1983-12-01), Wallace et al.
patent: 4709480 (1987-12-01), Takigawa et al.
patent: 3344863 (1984-07-01), None
patent: 726192 (1955-03-01), None
Howey Carla S.
Novinger Gary D.
Novinger Harry E.
Novinger Nancy K.
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