Matsushita Electric Industrial Co., Ltd.

Shuuichi Sugawara

Kenichi Nishikawa

Kazuhiro Ikeda

A key top attachment structure which makes the key-top attachment work easy, prevents the key top from being taken off from the outside, and suppresses looseness of the key top. A spring (,) provided with a rectangular hole (,), and lock portions (,A,,B and,) in which corresponding stoppers (,A,,B and,) of a key top (,) are to be locked respectively, are provided in a casing (,) of a small-sized electronic equipment such as an inter-call receiver or the like. A protrusion (,) which pushes the spring (,) at the time of attachment, a protrusion (,) which abuts against the spring (,) after attachment, a protrusion (,) which turns on a switch (,) on a printed board (,), and the stoppers (,A,,B and,) are provided in the key top (,).

Key top attachment structure

A center shaft (2a) for holding a key top (1), and springs (2b) are provided in a casing (2) of a small-sized electronic equipment such as an inter-call receiver. The springs (2b) are provided so as to extend from the peripheral portions toward the center shaft (2a), and holes are formed in the springs (2b) respectively. The key top (1) is provided with a stopper nail (1a), first protrusions 1b and second protrusions 1c. The protrusions (1c) of the key top (1) for pushing switches (3) are inserted through the holes of the springs (2b) respectively, and the stopper nail (1a) of the key top (1) is engaged with the center shaft (2a) acting as a fulcrum during the seesawing operation of the key top (1). Thus, the key top (1) is held in a stable manner. The existence of the center shaft (2a) prevents simultaneous depression of the two switches (3).

Key top holding structure

A small motor holding device in an individual Stalling receiver is designed, in which, even when the casing is shocked, the small motor is scarcely shocked, and vibration informing of the reception of a calling signal is transmitted positively to the casing, and which can be assembled with high work efficiency. A small motor is held in a motor holder of elastic material. The motor holder is coupled to a printed circuit board with the engaging section of the motor holder engaged with the engaging/receiving section of the printed circuit board. The motor holder is detachably press-fitted in a holding frame which is fixedly formed on the inner surface of a casing.

Growing community of inventors

Miyagi, Japan

Shuuichi Sugawara