| 摘要 |
According to the invention, the shaft (7) is fitted with a first shaft end (8) which is mounted so that it can slide in the shaft and is pushed back axially away from the shaft by an internal spring towards an end of travel stop. So that it can be inserted into the casing (1), the shaft (7) is engaged via its first shaft end (8) in a housing (12) in the first side plate (2) of the casing, and is then pushed back towards the first plate (2) so as to compress the spring, its second end then being inserted into the casing (1) so that it can be accommodated in the housing (13) of the second plate (3). <IMAGE>
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