词条 | John Joseph Rawlings |
释义 |
Wall plugThe original device was a jute fibre cylinder inserted into a hole drilled in the masonry and into which the screw was inserted. The deeper the screw penetrated, the more the fibre expanded and the greater the grip against the masonry. The jute was replaced by a thermoplastic plug in the 1960s, injection moulded singly, or in multiples attached together by the original sprue. Each plug can be easily twisted off the sprue when needed. Wall boltThe company went on to develop the Rawlbolt, a fitting with similar function but much greater size and strength. References
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