cushion head

cushion head, Brit. pile helmet

cushion head
A cap which covers and protects the head of a pile while it is being driven into the ground by a pile driver.
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An Aberdeen City Council spokesman said: "Unfortunately, the problem we face is that swing seats have to be able to cushion head impacts to comply with safety standards and prevent injury, particularly head impact.
The FT Air Cushion Head generates a cushion of air between the film and the head.