Bobbin and its producing method

Details Bobbin and its producing method Bobbin and its producing method

1999-01-22

2001-12-04

Donovan, Lincoln (Department: 2832)

Inductor devices

With supporting and/or spacing means between coil and core

Preformed insulation between coil and core

C336S192000

Reexamination Certificate

active

06326876

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a bobbin and its producing method, wherein the bobbin is used for reeling thereon a plurality of threads.
BACKGROUND OF THE INVENTION
The material for manufacturing the bobbin body can be divided into two groups, the thermoplastic material and the thermosetting material. The thermoplastic material is a linear polymer which has a higher flexibility and a higher strength but has a poor heat resistance in comparison with the thermosetting material. The strength of the thermoplastic material is lowered as the ambient temperature is increased. The cost for increasing the heat resistance of the thermoplastic material is high and uneconomic.
The conventional bobbins
10
,
20
are shown in FIG.
1
and FIG.
2
. The whole bodies of bobbins
10
,
20
are made of a thermoplastic or a thermosetting material by one time of injection molding. The thermoplastic material is the most popular material for producing a bobbin because it has a better mechanical property and a lower price. However, the thermoplastic material has a poor heat-resistance and there is a lot of heat conducting from the pins to the bobbin body when the soldered threads are held on the pins so that the bobbin body cracks and the pins fall off.
The thermosetting material has a higher heat resistance because of its network molecular structure. When the bobbin body is made of the thermosetting material, it can sustain the heat conducting from the pins. However, the strength of the thermosetting material is poor. The bobbin body made of the thermosetting material is very easily to crack when it rotates at high speed for reeling thereon threads.
The main purpose of the present invention is to produce a bobbin which can combine both of the advantages of the thermoplastic and thermosetting materials. The bobbin according to the present invention is economic and practical.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a bobbin for reeling thereon a plurality of threads. The bobbin includes a cylinder, a plurality of sleeves setting on the cylinder wherein the cylinder and the sleeves are made of different materials, and a plurality of pins inserting in the sleeves for holding the plurality of threads thereon.
In accordance with the present invention, the cylinder further includes a base for setting the plurality of sleeves thereon and the plurality of sleeves are set on the base by mold-inserting or embedding. Besides, the cylinder further includes a plurality of blades mounted at spaces for reeling the threads. The spaces between blades can be unequal. Each blade includes a plurality of zigzags on one end of the blade, and the zigzags of one blade are positioned in a direction opposite to those of neighboring blades. Preferably, the cylinder is made of a thermoplastic material. The plurality of pins hold the plurality of threads by soldering and the plurality of sleeves are made of a heatproof material. The heatproof material is a thermosetting material such as bakelite.
Another object of the present invention is to provide a method for producing a bobbin for reeling thereon a plurality of threads. The method includes (a) setting a plurality of pins, (b) forming a plurality of sleeves made of a heatproof material wherein the plurality of pins are set in the center of the plurality of sleeves, and (c) forming a cylinder made of a thermoplastic material wherein the plurality of sleeves are set on the cylinder.
In accordance with one aspect of the present invention, the plurality of sleeves are formed by a first time of injection molding and the cylinder is formed by a second time of injection molding.
The present invention may best be understood through the following description with reference to the accompanying drawings, in which:


REFERENCES:
patent: 3679998 (1972-07-01), Dahlinger
patent: 4146857 (1979-03-01), Schleupen
patent: 4165055 (1979-08-01), Dee
patent: 4621503 (1986-11-01), Woods et al.
patent: 4723731 (1988-02-01), Posso
patent: 5967816 (1999-10-01), Sampa et al.
patent: 5982263 (1999-11-01), Bouillot et al.

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