Bearing arrangement and indicating instrument using the same

Details Bearing arrangement and indicating instrument using the same Bearing arrangement and indicating instrument using the same

1998-11-12

2001-04-17

Gutierrez, Diego (Department: 2859)

Signals and indicators

Indicators

Rotary indicator with actuating means

C384S132000, C384S286000, C073S866100, C324S1540PB

Reexamination Certificate

active

06216630

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Applications Hei 9-319805 filed on Nov. 20, 1997 and Hei 10-173510 filed on Jun. 19, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bearing arrangement of an indicating instrument, particularly, a cross-coil type indicating instrument for a vehicle.
2. Description of the Related Art
In order to meet demands of reduction in size and of increase in accuracy, cross-coil-type indicating instruments have been adopted to vehicles. Such a cross-coil-type indicating instrument has a bobbin for cross coils, and a bearing for supporting a pointer shaft is formed at a central portion of the bobbin. Lubrication oil such as silicone oil is put between the bearing and the pointer shaft to reduce friction therebetween.
The bobbin is usually formed from a resinous material by an injection molding machine. However, it is difficult to form the bearing by the molding machine directly because burs or edges may be formed on the inner periphery of the bearing. Such burs or edges are obstacle to the lubrication.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved bearing arrangement of an indicating instrument which can be formed by an injection molding machine.
Another object of the invention is to provide an indicating instrument using an improved bearing arrangement made of a resinous mold.
In a bearing arrangement of a device according to a main aspect of the invention, a rotary shaft has an annular groove at a portion thereof opposite the bearing portion so that a part of the annular groove extends outward from the bearing portion, and lubrication oil is disposed between the rotary shaft and the bearing portion.


REFERENCES:
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Patent Abstracts of Japan, vol. 009, No. 294, Nov. 20, 1985 & JP 60 132125A (Kayo Seiko KK), Jul. 15, 1985.

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