| 摘要 |
The invention relates to seals on equipment used to make concrete pipe. Such equipment includes two generally vertical cylindrical surfaces, a core and a mold, with upper and lower end forming rings. The lower end forming ring, a pallet, has inner and outer vertical surfaces. Seals of the present invention are formed by using two hollow tubes of soft rubber. The tubes are housed in lower portions of the core and the mold so that they are in alignment with the inner and outer surfaces of the pallet. The tubes are pressurized into tight engagement with the pallet to prevent the outward flow of slurry from the space between the core and the mold.
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