| 摘要 |
429,303. Dashpots. POTTER RAX GATE CO., Ltd., Shepperton Road, Islington, London, and RAXWORTHY R. E., Fairholme Farm, Mark beech, Kent. Feb. 15, 1934 No. 5012. [Class 108 (iii) [See also Group XXV] A door-check comprises a cylinder C filled with oil and containing a piston G operatec by a rod E, the piston having one or more oil passages Q covered by a plate valve F which opens on the upstroke against a spring M on the end of the piston rod E and nearly closes on the downstroke to check the motion, complete closing being prevented by the end of a rod H screwed into the piston and adjustable from the top. |
