| 摘要 |
The invention relates to a marking device 20 to be mounted on an inspection chamber cover 10. The device is releasably secured to the inspection chamber cover 10 using its keyhole. It comprises a retainer 42 whose shape and size is such that the retainer is insertable through a keyhole. After insertion, rotating the retainer through enables it to engage with an under-surface of the inspection chamber cover. A mechanical fastener arrangement 32 (which may be a screw) couples the marker to the retainer and is operable to draw the marker toward the retainer. To mount the marking device upon the inspection chamber cover the retainer is inserted through the keyhole and rotated through a part turn, after which the mechanical fastener is operated to draw the retainer toward the marker, so that the retainer engages the under-surface of the inspection cover and so secures the marking device in position with the marker visible at an exterior surface of the inspection chamber cover. The marker is preferably formed as a plate carrying visual information such as a hazard warning. |
