Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
1998-07-02
2001-03-27
Young, Lee (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S874000, C029S885000, C264S259000, C264S328500, C264S550000
Reexamination Certificate
active
06205659
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a forming method for a push rod to be used for a push switch or the like.
2. Description of the Prior Art
A conventional push switch is made such that by pressing an end of a push rod a movable contact provided at another end of the push rod is brought into contact with a fixed contact provided inside the switch body in order to effect the switch ON/OFF position. A general manufacturing method for such a push rod is to cut a band-like contact plate material into a predetermined size and form a contact part by punching out. The contact plate is put into a forming mold to close the mold, followed by injecting a resin forming into the forming mold to form a push rod integrated with the contact plate.
According to the manufacturing method as referenced above, an independent press process is required for cutting of the material for the contact plate and the punching out of the contact part. Accordingly, the present invention is designed to provide a method for forming a push rod for a switch which does not necessitate the above steps.
SUMMARY OF THE INVENTION
In order to solve the above disadvantages of the conventional art, the first embodiment of the present application is characterized by having a first process of sending a band-like continuing contact plate material into a forming die, a second process for cutting a contact plate material into a predetermined length and punching out the contact part simultaneously with the closing of the forming die, and a third process for forming a push rod integrated with the contact plate by injecting a resin for forming into a forming die.
The second embodiment is characterized in that, in the second process of the first embodiment above, in order to support the central part of the contact plate, a press pin is provided on the forming mold along the center axial line of the push rod, and the end face part which is in direct contact with the contact plate of the press pin is formed in a concave or convex shape.
According to the first embodiment, by means of the forming mold for forming a push rod, the contact plate is cut into a predetermined size from the a hoop material (a band-like continuing material wound in a coil), and the contact part can be formed by closing pressure. Accordingly, contrary to the conventional procedure, it is unnecessary to press form the contact plate by providing a press mold separately from the forming mold, and it becomes possible to curtail the manufacturing steps and the metal molds.
According to the second embodiment, due to the formation of a recess or convex shape at a top end of the press pin for positioning a contact plate at the time a resin is formed a part of the contact plate is deformed in conformity with the profile of the recess or convex shape, thereby serving to strengthen the engagement between the top end part and the contact plate.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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patent: 5759477 (1998-06-01), Yamamoto
patent: 5783132 (1998-07-01), Matsumoto et al.
patent: 5800771 (1998-09-01), Ohno
patent: 5870817 (1999-02-01), Sehlhorst et al.
patent: 5897823 (1999-04-01), Davis et al.
Birch & Stewart Kolasch & Birch, LLP
Toyodenso Kabushiki Kaisha
Vereene Kevin G.
Young Lee
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