A device for measuring the circumference of a head has an elastic belt that is placed around the head in a plane that defines a maximum circumference. On its outer surface, the belt carries an encircling measuring tape. One end of the tape is fixed while the other end is held under a constant tension by a spring-loaded storage reel. Expansion or contraction of the belt, corresponding to the size of the enclosed head, is translated into a directly proportional movement of the tape as it winds or unwinds on the reel. In one form, the belt has a pair of embossed ribs circling its outward facing edges, each rib having a mutually facing groove that engages an edge of the tape.
展开▼
