| 摘要 |
<p>The principle involved in generating a clutch force in a knee joint mechanism of the conventional artificial leg shown in Fig. 2 is as follows. When a load from the upper body acts to the rear of a shaft (2), a leg connecting part (3) tends to tilt backward to compress a spacer (4) and lift a shaft (1). As a result, a clamping part (5) clamps the shaft (2) attached to a lower leg (6). The moment about the shaft (2) produced by this clamping force is a clutch force which is increased in this mechanism. Embodiments are shown in Figs. 3 and 4. The dimensions can be varied to increase the clamping force. The clamping part in Fig. 2 is divided into upper and lower segments (5, 1) and (5, 2) which are connected by a shaft (10) so as to withstand large clamping forces. The shaft (2) of Fig. 2 can be replaced by two friction discs (2a) of large diameter positioned inside and outside the knee. Elasticity of the knee is produced by an elastic unit (4a) inserted between the leg connecting part (3) and the upper disc segment (5, 1). </p> |
