| 摘要 |
Power supply boom which includes a ball coupling 1 provided with a pneumatic brake, a stress-relieving spring 2, booms 8 and 9, a brake coupling 3 which makes it possible for the boom to move in the vertical plane, and a ball coupling 4, a fastening rod 5 to which is secured a terminal device unit 6 and in conjunction with which is arranged the operating switch 7 of the pneumatic brakes. After the brakes have been removed from the couplings 1 and 3, one can move the power boom wherever is desired by means of the operating switch, wherein the stress-relieving spring 2 also makes the movement easier. <IMAGE>
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