| 摘要 |
PCT No. PCT/DK95/00183 Sec. 371 Date Nov. 12, 1996 Sec. 102(e) Date Nov. 12, 1996 PCT Filed May 9, 1995 PCT Pub. No. WO95/30617 PCT Pub. Date Nov. 16, 1995It is known that for an easily height displaceable "weightless" support of heavy objects such as car wheels to be mounted on a balancing machine, it is possible to use an air cylinder (22) having a voluminous lower pressure chamber (20) into which compressed air from an inlet valve (36) can be introduced for building up an air spring to equalize the weight of the object, whereby the object can be moved somewhat up and in "weightless" condition. This requires a certain adaptation of the supply of the compressed air, and the invention provides for a device having means for effecting such an adaptation automatically. An inlet valve (36) is used, which is openable by operator actuation when the elevating system (6, 10) assumes its bottom position, while the valve is closed in response to the initial raising of the elevating system (6, 10, 18, 30). The device additionally has easily operated means for a corresponding bleeding of the cylinder, whereby it is possible to make the elevating system depart from its top position. |
