Cutlery – Cutting tools – With blade moving means
Reexamination Certificate
1999-05-13
2001-02-13
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
With blade moving means
C030S272100
Reexamination Certificate
active
06185826
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an electrically powered slicing knife, and in particular to an electric knife having a switch guard functioning to reduce the possibility of injury to a user of the knife when the user desires to remove the blades thereof.
Electrically operated slicing knives are among the most popular small kitchen electrical appliances. Most of these slicing knives comprise a pair of blades releaseably secured together and reciprocated by a suitable electric motor contained in a housing. The blades are in sliding contact with each other.
During normal usage of the slicing knife, for example, when cutting meat, the blades become dirty and require cleaning. During the cutting operation, the blades are securely held within the knife housing and are connected to the motor. To enable the blades to be readily cleaned, it is desirable that the blades be easily removable from the housing. To minimize the potential of injury to the user, it is important that the knife include means to reduce the possibility that the knife will be accidentally energized when the blades are being either removed from or reinserted into the housing.
Accordingly, it is an object of the invention to provide in an electric slicing knife means to minimize the possibility of injury to a user when the user is removing blades from the knife housing.
SUMMARY OF THE INVENTION
The foregoing object and other objects of the invention are obtained in an electrically operating slicing knife including a housing having an electric motor mounted in the housing. Gear means are provided for converting rotary motion of the motor to reciprocating motion of the blades. A pair of blade holders are connected to the gear means for opposite reciprocating motion with respect to each other. The knife further includes a pair of blade members having adjacent faces in sliding engagement with each other and having a cutting portion and a tang portion. The tang portion of a first blade member is received by a first blade holder, and a tang portion of the second blade member is received by the second blade holder. A resilient member releaseably secures the blade members in the blade holders. A user operated switch selectively connects the motor to a source of electrical power. A guard overlies the switch and is movable between a first position whereat the switch is uncovered to permit activation by the user and a second position whereat the switch is covered to prevent activation by the user. A movable locking means is in operative relationship with the resilient member and the guard. The switch guard moves and retains the locking means in a locking position relative to the resilient member when in the first position. The guard when in the second position enables the user to move the locking means into an unlocking position relative to the resilient member.
The object of this invention is also obtained in a method of operating an electrically powered knife comprising the steps of inserting a knife blade into a knife handle for cutting purposes; placing an actuating switch in an on position to operate the blades in a cutting motion while simultaneously preventing the user from removing the blades from the handle; placing the switch in an off position to deactivate the blades; and blocking the switch to prevent user actuation while simultaneously enabling the user to remove the blades from the handle.
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Lutz Scott
Naft Stuart
Paul Joseph
Toro Joseph
Deutsch Barry E.
Watts Douglas D.
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