Pipe joints or couplings – Nonmetal to metal – Internal member
Patent
1994-05-13
1995-11-28
Nicholson, Eric K.
Pipe joints or couplings
Nonmetal to metal
Internal member
285259, 2853822, 285421, F16L 1314
Patent
active
054701139
ABSTRACT:
A connector for cylindrical plastic tubes has a metallic inner sleeve with an outer diameter that is greater than in inner diameter of the plastic tubes to be connected. The inner sleeve has a free end and a securing flange positioned opposite the free end. A metallic sliding sleeve for being slipped onto a section of the plastic tube having inserted therein the inner sleeve is provided. The inner sleeve has an outer surface with at least one circumferential rib of a substantially rectangular cross-section. The sliding sleeve has a leading end and a rearward end in the direction of sliding onto the section. The sliding sleeve has an inner surface that beginning at the leading end and ending at the rearward end, has sequentially: a first conically narrowing zone, a second conically narrowing zone, a cylindrical zone, a third conically narrowing zone, and a cylindrical zone. In a preferred embodiment, two inner sleeves are fixedly connected to one another in a mirror-symmetrical arrangement to form a unitary sleeve member.
REFERENCES:
patent: 3817561 (1974-06-01), Kay
patent: 4021061 (1977-05-01), Zimmerman
patent: 4088349 (1978-05-01), Guest
patent: 4220359 (1980-09-01), Evenson et al.
patent: 4257629 (1981-03-01), Maple et al.
patent: 4598938 (1986-07-01), Boss et al.
patent: 4858968 (1989-08-01), Moebius
patent: 4911484 (1990-03-01), Hackforth
patent: 5332269 (1994-07-01), Homm
Neumann Rainer
Schwalm Dieter
Nicholson Eric K.
Vulkan Lokring GmbH
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