Extended shaft and a mold of the extended shaft and an apparatus

Details Extended shaft and a mold of the extended shaft and an apparatus Extended shaft and a mold of the extended shaft and an apparatus

1997-03-18

2000-12-12

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264 406, 264572, 264327, 264519, B29D 2300

Patent

active

061594156

ABSTRACT:
A molding apparatus is provided for molding an elongated shaft member. The elongated shaft member (20) comprises: a main body (21) made from synthetic resin material; a hollow portion (22) formed inside of the main body (21), which extends substantially in a direction of a center axis (O1) of the main body; first and second shaft portions (23) formed at ends of the main body (21) respectively, which are smaller in diameter than the main body (21); and through-holes (24) formed in the first and second shaft portions (23) respectively, which are substantially coaxial with the center axis (O1). The molding apparatus comprises a mold (26, 27), a medium injection device (50) for injecting a hollow-portion forming medium from a medium injection portion (32), and a resin filling device (40) for filling the cavities with molten resin through a resin injection portion (31). The mold (26, 27) comprises: a main cavity (28) for forming the main body (21), which has a cavity center axis (O2) corresponding to the center axis (O1); first and second shaft cavities (29, 30) for forming the first and second shaft portions (23) respectively; the medium injection portion (32) for injecting the hollow-portion forming medium through the first shaft portion cavity (29) along the cavity center axis (O2); a resin injection portion (31) for injecting the molten resin; and a surplus-resin receiving cavity (34) for receiving through the second shaft portion cavity (30) a surplus of the injected molten resin as a result of injecting the hollow-portion forming medium.

REFERENCES:
patent: 4990083 (1991-02-01), Bernhardt
patent: 5044924 (1991-09-01), Loren
patent: 5262105 (1993-11-01), Komiyama
patent: 5620639 (1997-04-01), Stevens et al.
patent: 5772933 (1998-06-01), Kotzab
patent: 5773109 (1998-06-01), Kubo et al.
patent: 5788917 (1998-08-01), Herlache

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