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    • 9. 发明公开
    • A Pavement Breaker
    • Abbruchhammer
    • EP1872914A1
    • 2008-01-02
    • EP07111179.3
    • 2007-06-27
    • Black & Decker, Inc.
    • Friedrich, AndreasGensmann, Stefan
    • B25D17/20B25D17/24
    • B25D17/20B03C1/286B03C1/30B25D17/24B25D2217/0092B25D2250/141
    • A hammer drill comprising: a housing; a tool holder mounted on the housing; a motor (32) mounted within the housing; a piston (50) and ram (54), each slideably mounted within the housing; a drive mechanism which converts the rotary output of the motor (32) into a reciprocating motion of the piston (50); the ram (54), mounted forward of the piston (50), reciprocatingly driven by the piston (50) via an air spring (56); a beat piece (58), slideably mounted forward of the ram (54), and which is repetitively struck by the reciprocating ram (54) and which in turn repetitively strikes an end (402) of a tool; a counter mass (102) slideably mounted within the housing; a biasing mechanism (110,112) located within the housing which is connected to the counter mass (102) and which biases it to a predetermined position; wherein, when the hammer drill is operated, the counter mass (102) is caused to oscillate to counteract the vibration in the housing generated by the movement of the piston (50) and/or ram (54) and/or beat piece (58); wherein the counter mass (102) comprises magnetic material.
    • 一种锤钻,包括:壳体; 安装在壳体上的工具架; 安装在所述壳体内的马达(32); 活塞(50)和冲头(54),每个可滑动地安装在壳体内; 驱动机构,其将所述马达(32)的旋转输出转换成所述活塞(50)的往复运动; 安装在活塞(50)前方的冲头(54)通过空气弹簧(56)由活塞(50)往复运动; 可滑动地安装在所述冲头(54)的前方并被往复运动的冲头(54)重复地撞击并且反复地撞击工具的端部(402)的打击片(58) 可拆卸地安装在所述壳体内的对质量块(102) 偏置机构(110,112),其位于所述壳体内,所述偏压机构连接到所述反质量块(102)并将其偏压到预定位置; 其特征在于,当所述锤钻操作时,使所述对质量(102)摆动以抵消由所述活塞(50)和/或压头(54)和/或击打片(58)的移动而产生的所述壳体中的振动 ); 其中所述对质量(102)包括磁性材料。