| 摘要 |
A light-weight, easily manoeuvrable jig (30) comprised of a pole (8, 9) for resting on the ground or floor holds a powered tool (5) having a handle (5a) . The pole includes a vertically expanding device (9) in the form of a pneumat ic cylinder for lifting and lowering the tool (5). The tool (5) is mounted on t he jig (30) in such a way that, by using the handle (5a), the tool (5) is, to a limited extent, universally angularly manoeuvrable with respect to the jig (30). Vibration-absorbing elastomeric sleeves (12) and (14) are located between the tool (5) and the jig (30) for absorbing vibrations caused by operation of the tool (5). The expanding device (9) is operated by the use o f a pressure regulator valve (10) and a combined height-adjustment and air- release valve (11). In another embodiment, the expanding device (9) is operated by trigger (17) of the tool (5), the pressure in the expanding devi ce being controlled by the pressure regulator valve (10). In a further embodime nt the expanding device (9) is simply operated using the trigger (17) of the to ol (5).
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