| 摘要 |
This jack, intended for transferring the instantaneous forces applied to a structure to rigid supports, whilst allowing its free expansion, comprises a rod 6, connected by a spherical bearing surface 30, 32 to the structure, which carries a piston 8 but passes right through the closed cylinder 1 which is connected via a support base 26 and a hooped neoprene plate 27 to the support. A narrow peripheral clearance 14 between the piston 8 and the cylinder 1 puts the two inner chambers 16, 17 of the cylinder in constant but limited communication, whilst a hole 20, passing through the piston and fitted with a non-return valve, facilitates the free flow of the liquid when the rod 6 comes out. <IMAGE>
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