| 摘要 |
A heater assembly (14) clamps onto cylindrical bodies (12) such as injection molding nozzles (12) that require heating. A mandrel (16, 61) slips over the nozzle (12), and has a heater (24, 68) wound on the exterior. The mandrel (16, 61) has a longitudinal slit (32, 65) that will permit the bore of the mandrel (16, 61) to be reduced in size when a lateral width of the slit (32, 65) is reduced. The mandrel (16, 61) carries outwardly facing cam surfaces (20A, 21, 63A, 67), and an overlying sleeve (30, 70) has inwardly facing cam surfaces (36A, 40A, 71A, 72A) which mate, and upon relative longitudinal movement, the cam surfaces (36A, 40A, 71A, 72A) cause the lateral width of the slit (32, 65) to reduce and clamp the mandrel (16, 61) onto the nozzle (12). The clamping can be effected by differential movement due to differences in thermal expansion of the mandrel (16) and the sleeve (30), or by mechanical movement of the sleeve (70) relative to the mandrel (61) to obtain the cam action.
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