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    • 3. 发明授权
    • Compression spring tensioner for the blade of portable electric band saw
    • 压电弹簧张力器用于便携式电动锯条的刀片
    • US3829970A
    • 1974-08-20
    • US39926473
    • 1973-09-20
    • MILWAUKEE ELECTRIC TOOL CORP
    • ANDERSON M
    • B23D53/12B23D55/10B27B13/08B26B25/00
    • B23D55/10
    • A compression spring tensioner for the blade of a portable electric band saw has a rotatable blade release lever which upon rotation causes a release shaft with an eccentric crank pin bearing to move a blade tension bar which acting through compression spring means and a spring anchor bar causes the front pulley guard and the front idler pulley to slide. As this unit is slid forward, the blade becomes fully tight and the guard and pulley cannot move further forward. However further rotation of the blade release shaft forces the blade tension bar to compress the compression spring means to apply an accurate predetermined tension to the band saw blade. Furthermore, the eccentric crank pin bearing operates in an overcenter relationship to the blade tension bar to provide a positive means of holding the rotatable blade release lever against a fixed stop to assure that the accurate preload on the band saw blade is maintained under all conditions during usage of the saw.
    • 用于便携式电动带锯的叶片的压缩弹簧张紧器具有可旋转的刀片释放杆,其在旋转时引起具有偏心曲柄销轴承的释放轴以移动通过压缩弹簧装置作用的叶片张力杆和弹簧锚杆引起 前滑轮护罩和前惰轮滑动。 当该装置向前滑动时,叶片变得完全紧固,护罩和滑轮不能向前移动。 然而,叶片释放轴的进一步的旋转迫使叶片张力杆压缩压缩弹簧装置,以向带锯叶片施加精确的预定张力。 此外,偏心曲柄销轴承以与叶片张力杆的偏心关系运行,以提供将可旋转刀片释放杆保持在固定止动件上的正面装置,以确保在所有条件下保持带锯片上的精确预载荷 使用锯。