Cutlery – Cutting tools – With guard and/or guide
Patent
1990-01-12
1991-01-01
Watts, Douglas D.
Cutlery
Cutting tools
With guard and/or guide
30 2, 30151, 30295, B26B 2900, B26B 306, B67B 700
Patent
active
049809776
ABSTRACT:
A knife for cutting honeycomb core and other materials with a combination of safety features to prevent or minimize injury to operator. The blade used has a hole through which a fastening device e.g. threaded screw, locks it to a handgrip. A safety guard covers the blade when not in use and automatically retracts as the blade is removed from the workpiece. The guard cannot be accidently displaced from the blade. It must be purposely unlocked by a manually triggered self-locking release assembly located in the handgrip which also automatically relocks the safety guard when retracted. The safety features consist of an automatically retractable guard attached to a safety handshield working in conjunction with the safety self-locking release assembly to prevent accidental release. Embodiments include (1) wherein the guard is opaque and has viewing ports and is hinged mechanically with springs, supports, and spacers, (2) wherein the guard is transparent eliminating the need for viewing ports, (3) wherein the guard and many other metal components are comprised of plastic, (4) wherein the guard is transparent and is hinged by an integrally molded component, (5) wherein the guard is hinged by a combination of mechanical (1) and integrally molded (4) means and (6) wherein a disposable blade is used.
REFERENCES:
patent: 365714 (1887-06-01), Warner
patent: 1843535 (1932-02-01), Arnold
patent: 2122263 (1938-06-01), Pinter
patent: 2644230 (1953-07-01), Anderson
patent: 3184843 (1965-05-01), Lurie
patent: 4091537 (1978-05-01), Stevenson
patent: 4531286 (1985-07-01), Vito et al.
Matin Barry D.
Pelton Ellwood R.
Trepus, Jr. George E.
Donahue B. A.
Gardner C. O.
Heyrana Paul M.
The Boeing Company
Watts Douglas D.
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