| 摘要 |
A fastening device for rapidly securing two parts, such as an inspection plate or cover on a main frame or casing in which the cover and frame or casing have plain holes drilled, stamped or otherwise formed therein so as to be in register in the assembled condition, the fastener having a helical land engageable with a pair of such holes by rotation while inclined to the plane of each hole and by continued rotation being movable relative to the cover and frame or casing to bring the margins defining the holes into engagement between a head of the fastener and an end face of the land which terminates short of the head.
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