| 摘要 |
PCT No. PCT/US97/22240 Sec. 371 Date Jul. 23, 1998 Sec. 102(e) Date Jul. 23, 1998 PCT Filed Dec. 2, 1997 PCT Pub. No. WO98/24715 PCT Pub. Date Jun. 11, 1998A self-indicating tensioning device for a scraper blade includes a flat spring coupled at one end to a rotatable shaft which supports the blade and coupled at it's other end to an adjusting mechanism. The adjusting mechanism is operable to exert a force on the flat spring which in turn applies a torque to the rotatable shaft for displacing the scraper blade. An indicator rod has one end fixed to the rotatable shaft and the other end is free and located adjacent to a graduated indicator plate.
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