| 摘要 |
An assembly is mounted and secured on a support by at least one securing bolt that is pre-installed in the assembly and engages a keyhole-shaped opening provided in the support. The head of the bolt is inserted through the larger portion of the keyhole opening and then slidingly displaced so the bolt shaft is engaged in the narrower portion of the keyhole opening and the bolt head is secured behind the support. A safety cap is initially mounted on the bolt to cover the tool engagement surfaces of the bolt, and the cap is inserted in the opening together with the bolt. As the assembly is slidingly displaced relative to the support, the safety cap is pushed off the bolt to expose the tool engagement surfaces, by contact of stop surfaces of the safety cap with stop surfaces of the support. The safety cap thereby prevents engagement of a tightening tool with the bolt, until the bolt has surely reached its proper securing position.
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