| 摘要 |
A headrest for securing to the window in the cab of a truck, or to any supporting surface in other types of vehicles, employing a cushion of porous plastic material surrounded by a nonporous material. The cushion has a port extending through the casing and into the porous material. A valve is mounted on the casing to control air flow through the port upon head impact with the cushion and substantially closing the port upon inflow of air through the port and into the cushion after impact. Means are mounted on the cushion for affixing it to the window of the cab of the truck or other surfaces in other types of vehicles.
|
