| 摘要 |
A hand knife has a removable blade. Side plates are spaced apart on opposite sides of a main frame having a rectangular socket in one end thereof. One side plate has a non-circular aperture therein and the other side plate has a circular opening therein. A pin is movable on a transverse axis relative to the main frame and has a non-circular portion in the aperture and a circular portion in the opening. A blade has an exteriorly rectangular end slidable in a predetermined direction to fit the socket. The end interiorly has a keyhole opening, the circular portion of which fits the larger, circular part of the pin and the rectangular portion of which is open ended in the predetermined direction and fits the smaller, non-circular portion of the pin. A spring normally urges the circular portions into interengagement. A button on the pin, when pressed, overcomes the spring and moves the non-circular portion into sliding engagement with the rectangular portion of the keyhole opening. The blade can then be moved in the predetermined direction relative to the main frame. In another form, a springy lever on the main frame is movable out of engagement with a notch in the blade to release the blade for rotation about the pin to a position in which the lever indexes against the socket end of the blade.
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