DEHNBARER AUFSTECKDORN

摘要

1402012 Expansible mandrels G GATTRUGERI 30 June 1972 [2 July 1971 (2)] 30650/72 Heading F2U An expansible mandrel comprises a shaft 2 with an axial chamber 9 connected by a check valve 8 with one or each of several hoses 4 expansible by fluid pressure to urge radially outwardly a (e.g. segmental) pressing element 3 located in a slot in the shaft inflation of the hoses being via the valve(s) 8, which may be opened to deflate the hoses by axially moving a rod 10 with a conical portion(s) 11. In Fig. 7 (not shown), the valves (61) are opened by moving a rod with conical portions (61b). In Figs. 3 to 6 (not shown), deflation may be by opening a check valve (81) in the second axial chamber when the check valves (80) release pressure in the hoses (50). The hoses may either extend axially, Figs. 1 to 4 (not shown), or encircle the mandrel, Figs. 5 to 7 (not shown).