Electricity: conductors and insulators – Conduits – cables or conductors – Insulated
Reexamination Certificate
1999-02-24
2001-04-17
Kincaid, Kristine (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Insulated
Reexamination Certificate
active
06218623
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a protective tubular member for an automotive control wire which is provided for various mechanisms of an automobile such as trunk opening mechanism, bonnet opening mechanism, fuel lid opening mechanism, throttle, choke, brake, transmission, and window regulator and transmits the operation by pulling, and to a method for manufacturing the protective tubular member.
2. Description of Related Art
A publicly known protective tubular member for an automotive control wire is constructed so that a control wire
22
is covered with a hollow tubular member
21
formed of a synthetic resin, as shown in
FIG. 7
, to protect the operation of a control wire provided for various mechanisms of an automobile for a long period of time. The publicly known protective tubular member
20
consisting of the hollow tubular member
21
made of a synthetic resin has a disadvantage because the control wire
22
in the tubular member
21
is operated heavily by powerful push and pull forces, the hollow tubular member
21
wears remarkably and is damaged. Thus, which the protective tubular member
20
becomes unusable as the protective member of the control wire. Further, in order to prevent damage to the protective tubular member, a protective tubular member
20
for the automotive control wire
22
as shown in
FIG. 8
has been developed. The hollow tubular member
21
is made of a synthetic resin covering the control wire is covered with an external tubular member
23
made of a synthetic resin, which is provided with steel wires
24
on the inside surface thereof. However, this protective tubular member
20
has problems in that the manufacture thereof requires much manpower and cost. Also, the friction between the steel wires at the inner periphery of the external tubular member
23
and the outer periphery of the hollow tubular member
21
results in damage to the hollow tubular member.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a protective tubular member for an automotive control wire and a method for manufacturing the protective tubular member in which a rough surface portion with irregularities is formed on the exposed surface of an internal protective film layer in contact with the control wire to prevent damage by reducing wear caused by contact with the control wire.
The protective tubular member for an automotive control wire in accordance with the present invention comprises a hollow tubular member formed of a synthetic resin and a protective film layer joined integrally to the hollow tubular member. The protective film layer is formed of a base material that is compatible with the synthetic resin for the hollow tubular member and has a low frictional resistance, and an additive material of grains and particles of synthetic resin having a higher melting point and a lower frictional resistance than the base material. The additive material is mixed with the base material to form a rough surface portion with irregularities on the exposed surface of the protective film layer.
In the protective tubular member for an automotive control wire in accordance with the present invention, the protective film layer can be formed of a base material of polyolefin based resin with a low frictional resistance having low viscosity and high fluidity and an additive material of powder and particles of polyolefin based resin having a higher viscosity and lower fluidity than the base material.
In the method of manufacturing a protective tubular member for an automotive control wire in accordance with the present invention, a mixture for a protective film layer consisting of a base material of a synthetic resin having compatibility with and a lower frictional resistance than a synthetic resin for a hollow tubular member and an additive material of grains and particles of synthetic resin, inorganic material, or mineral having a higher melting point and a lower frictional resistance than the base material is poured and melted in a first extrusion molding machine. A synthetic resin for the hollow tubular member is poured and melted in a second extrusion molding machine, and the first and second extrusion molding machines are operated at the same time. The mixture in the first extrusion molding machine and the synthetic resin in the second extrusion molding machine are polymerized and joined integrally in a die by heat and pressure to form the hollow tubular member provided with the protective film layer having a rough surface portion with irregularities.
In the method of manufacturing a protective tubular member for an automotive control wire in accordance with the present invention, a mixture for the protective film layer consisting of a base material of polyolefin resin with a low frictional resistance having low viscosity and high fluidity and an additive material of powder and particles of polyolefin resin having higher viscosity and lower fluidity than the base material can be poured in the first extrusion molding machine.
REFERENCES:
patent: 2454800 (1948-11-01), Hartstein et al.
patent: 2645249 (1953-07-01), Davis et al.
patent: 3349169 (1967-10-01), Donadieu
patent: 3852518 (1974-12-01), Wargotz et al.
patent: 3950604 (1976-04-01), Penneck
patent: 3968463 (1976-07-01), Boysen
patent: 5958532 (1999-09-01), Krause et al.
Kato Katsuhisa
Miyakawa Naohisa
Kincaid Kristine
Nguyen Chau N.
Tokiwa Chemical Industries & Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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