| 摘要 |
A safety lock comprises a locking member ( 26, 28 ) which engages a support. An inner lock shaft ( 30 a) actuates the locking member, the inner lock shaft having a first coupling face ( 35 a) at one end thereof. An outer lock shaft ( 30 b) has a second coupling face ( 35 b) which engages the first coupling face when the inner lock shaft and the outer lock shaft are in respective engagement positions relative to each other. A coupling structure ( 18 ) moves to prevent engagement of said first coupling face with said second coupling face.
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