| 摘要 |
980,726. Coal &c. crushers. A. OELLRICH, [trading as MASCHINENFABRIK UND EISENGIESSEREI A. BEIEN]. Sept. 19, 1963 [Oct. 13, 1962], No. 36959/63. Heading B2A. [Also in Division F2] A through-feeding crusher for coal &c. comprises a crusher roll 3 mounted on a hinged arm 1 which is yieldably deflectable against the resistance of one or more double-acting damping cylinders 7 which each contain a piston 9 which divides the cylinder into two chambers filled with hydraulic fluid and communicating exclusively with one another through one or more connections containing a flowconstricting section. The piston 9 is traversed by one or more ducts 13, Fig. 3, to damp the movement of the arm 1 when it is forced upwards. Fluid is permitted to return through a larger cross-section so that the arm 1 can return very quickly. Alternatively, the ducts 13 may have a non-variable small cross-section, a by-pass pipe 14 being provided with a non- return valve 15 which preferably has an adjustable flow section.
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