| 摘要 |
An invalid walker includes a means for locking at least one of the side frames in a hyperextended position. The walker includes a pair of U-shaped side frames whose front legs are connected by a cross brace member. Each of the rear legs of the side frames is connected to the cross brace member by a telescoping tubular device in which a first tube telescopes into and is received by a second tube. A pushbutton mechanism is housed inside the first tube and positioned within a first aperture in the first tube. The second tube includes a pair of locking apertures, one for locking the side frame in a first normal open position and the second for locking the side frame in a hyperextended position. The apparatus further includes a foot adjustment means for levelling the rubber foot of the hyperextended rear leg of the hyperextended side frame with the feet of the other three legs of the apparatus.
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