| 摘要 |
A human forearm prosthesis (10) is disclosed which has attached thereto a device (12) comprising a housing (20), a knife blade (14) suitable for cutting food, means on the knife blade for restraining the travel of the knife blade into said housing when it is desired to retract said knife blade into said housing for storage thereof, and out of said housing when it is desired to extend the knife blade for use of the knife blade for cutting food. Preferably, the knife blade moves into and out of the housing by force of gravity. A first means for restraining the travel of the knife blade comprises a guide means (24, 26) which extends substantially the length of said housing, and a projection (30) located on or near the back end of the knife blade, which projection travels in said guide means. The device of the invention has a second means for restraining the travel of said knife blade which comprises a spring operated knife blade release mechanism (40) that blocks the knife blade from passing out of the housing when it is desired to restrain the blade in retracted position.
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