| 摘要 |
<p>A vibration-damping control handle connectable to the shaft portion of a portable power tool, such as a flexible line trimmer or the like, has an elongated, generally tubular vibration isolation section which coaxially circumscribes the shaft. A first end portion of the vibration isolation section is clamped to the shaft so that the balance of the section is cantilevered relative to the shaft and defines therewith an annular clearance space. The inner end of a handgrip connecting section is secured to a second end portion of the vibration isolation section, the connecting section projecting laterally outwardly from the vibration isolation section and having an operator handgrip secured to its outer end. During operation of the tool, transverse shaft vibration is absorbed by the vibration isolation section to thereby isolate the handgrip from a substantial portion of such vibration. The vibration isolation section also functions as a cantilevered spring element which may be laterally flexed into engagement with the shaft to exert a stronger lateral control force on the shaft, the shaft acting as a stop to limit such lateral flexure. In alternate embodiments of the handle an annular resilient cushioning member is secured to the vibration isolation section to define a resilient stop portion thereon. When the vibration isolation section is bottomed out against the shaft the resilient member engages the shaft and absorbs additional shaft vibration which might otherwise be transmitted to the handgrip through the handgrip connecting section. In a further alternate embodiment of the handle the second end portion of the vibration isolation section is transversely enlarged and has a spherically curved outer surface. The handgrip connection is removably clamped to this spherically curved outer surface in a manner permitting a wide range of positional adjustment of the handgrip relative to the vibration isolation section.</p> |
