Switch device

Details Switch device Switch device

1999-10-13

2001-03-20

Friedhofer, Michael (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Contact

C200S01600R, C200S01600R

Reexamination Certificate

active

06204458

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a switch device, and particularly to a switch device which can be easily assembled.
DESCRIPTION OF PRIOR ART
Conventional switch devices are classified as IC type switch and non-IC type switch devices. IC type switch devices have a plurality of contacts which are received in a base using an insertion molding process, the number of the contacts being adjusted to fit the mold used. An IC type switch does not meet the need for varying numbers of contacts in a mass production environment.
A non-IC type switch comprises a base forming a plurality of receiving passageways for receiving a corresponding number of movable contacts and fixed contacts, and a cover mounted on the base. A plurality of sliding members is received in the cover. When pushed, the sliding members press down on the movable contacts, and a reactionary force from the contacts to the sliding members is transmitted to the cover. Thus, a separating force acts between the cover and the base and the engagement between the cover and the base is not reliable. To solve the engagement problem, an adhesive is commonly used to secure the cover to the base. However, the adhesive sometimes seeps through to the contacts and influences the conductive ability of the switch.
Thus, there is a need for an improved switch device which is easily assembled and provides reliable electrical signal transmission.
BRIEF SUMMARY OF THE INVENTION
A main object of the present invention is to provide a switch device which is easily assembled and mass produced.
Another object of the present invention is to provide a switch device which provides reliable electrical signal transmission.
To fulfill the above-mentioned objects, a switch device according to the present invention comprises a base forming a plurality of spacing walls thereon, spaced equidistant from and parallel to each other. A projecting block is formed between adjacent spacing walls. Each spacing wall comprises a top surface with a pair of arched projections formed on lateral ends thereof. A pair of locking blocks is formed at lateral sides of the base. A plurality of receiving holes is defined in longitudinal edges of the base. A fixing contact plate and a movable contact plate each form a plurality of fixed contacts and movable contacts, respectively. Each fixed contact comprises a contacting portion, a pair of shoulders formed on lateral edges of the contacting portion for connecting with a carrier plate and an insertion leg extending from the contacting portion. A V-cut is formed in each connecting portion of the fixed contact for facilitating the process of removing the fixed contact plate from the carrier plate. Each movable contact comprises a contacting arm, a pair of connecting shoulders connected with a carrier plate and an insertion portion extending opposite the contacting arm. A V-cut is formed in each connecting shoulder for facilitating the process of removing the movable contact plate from the carrier plate. Insertion legs of the fixed contacts and insertion portions of the movable contacts are received in their respective receiving holes in the base. A plurality of sliding members is mounted on the base for selectively opening and closing electrical contact between the fixed and moveable contacts. A cover forms a plurality of openings for receiving corresponding sliding members. A pair of locking slots is formed at lateral sides of the cover for engaging with corresponding locking blocks on the base.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 4366351 (1982-12-01), Ditzig
patent: 4658101 (1987-04-01), Akimoto et al.
patent: 4833280 (1989-05-01), Bingo et al.
patent: 4841109 (1989-06-01), Sakakino et al.

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