| 摘要 |
A distortion generating sheet ( 22 ) intervenes between a first and a second flexible sheets ( 11 ) and ( 12 ), respectively, with one end ( 23 ) thereof fixed to the first sheet ( 11 ), and the other end ( 24 ) fixed to the second sheet ( 12 ). As a consequence, when a shear takes place across the first and second sheets ( 11 ) and ( 12 ), respectively, the shear is conveyed to the distortion generating sheet ( 22 ). A strain gauge ( 21 ) fixed to the distortion generating sheet ( 22 ) detects and measures the distortion generated by the shear in the distortion generating sheets ( 22 ). A third sheet ( 15 ) is further provided with its periphery bonded to the first sheet ( 11 ) to form a closed space. The force bearing the patient is measured by measuring the pressure in the space formed.
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