| 摘要 |
PCT No. PCT/SE91/00834 Sec. 371 Date Aug. 31, 1992 Sec. 102(e) Date Aug. 31, 1992 PCT Filed Dec. 5, 1991 PCT Pub. No. WO92/10928 PCT Pub. Date Jul. 9, 1992.A teat cup liner (12) conventionally has a rotationally symmetrical tubular thick walled shaft portion (15), which has an outer annular groove (16) for receiving an annular end of a shape permanent rotationally symmetrical tubular teat cup 6), on which the teat cup liner is to be mounted, so that the teat cup liner is stretched by the teat cup. According to the invention the tubular shaft portion (15) is provided with an inner annular groove (17) situated close to the outer groove (16) of the shaft portion, but axially displaced relative to the outer groove in direction toward the free end of the shaft portion. The inner groove (17) counteracts the formation of an inner bulging of the shaft portion in front of the outer groove (16), when the teat cup liner is mounted on the teat cup (6).
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