| 摘要 |
969,398. Shock absorbers. P.C.C. July 11, 1962 [July 17, 1961], No. 26733/62. Heading F2S. A shock and vibration damper comprises a piston 9, the rod 8 of which is attached to a structure 2 and which works within the cavity of a body which is attached to a second structure 1. The head of the piston is interposed between two rubber-like deformable membranes 11, 13 working in opposition, the first of the membranes 11 being inserted between the head of the piston and the end 4 of the cavity facing the membrane, and having an inverted cup-shaped centre portion which upwardly tapers towards the centre zone of the head so that the peripheral marginal zone of the head is axially spaced from the first membrane in the unloaded condition of the damper. The second membrane 13 surrounds the rod of the piston and is interposed between the head of the piston and the end of the cavity through which the rod extends. In the construction shown in Fig. 1 the membranes 11, 13 are attached to the wall of the body 4. The lower membrane 11 may be of bell shape, the upper membrane 13 being a clearance fit within the body and being provided with a sleeve at its inner periphery, the sleeve gripping the piston rod (Fig. 3, not shown). An air hole may be provided in the body to vent the space beneath the lower membrane 11. In a further embodiment (Fig. 5) a shoulder 19 is provided within the body 4 with which the skirt 18 of a bell-shaped membrane 11 engages. The upper membrane 13 is secured to the piston rod 8 and is a sliding fit within the body. Membrane 13 is formed with a groove adjacent its periphery. |
