| 摘要 |
PCT No. PCT/SE95/00332 Sec. 371 Date Jan. 24, 1997 Sec. 102(e) Date Jan. 24, 1997 PCT Filed Mar. 29, 1995 PCT Pub. No. WO96/03602 PCT Pub. Date Feb. 8, 1996A shock valve for vacuum lifting devices of the type incorporating a suspended flexible hose with suction head and connected to a vacuum source, wherein the lifting motion is effected in that a negative pressure in the hose causes the suction head to retain a load and to raise this due to the contraction of the hose caused by the internal negative pressure, and where the shock valve (6) is intended to prevent uncontrolled throwing movements when a load is dropped during prevailing negative pressure, whereby the shock valve (6) is connected to the interior of the hose adjacent the lower end thereof, and is provided with a body of inertia (16), which forms part of the shock valve, which body of inertia is connected to or constitutes members adapted for exposing large valve openings (11, 12), at momentary immobile condition of the body of inertia caused by the relative motion of the body of inertia in relation to the other parts of the shock valve, which occurs initially at a rapid acceleration of the hose, whereby the vacuum in the hose will cease very rapidly.
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