| 摘要 |
In a keyboard switch including a pantograph mechanism comprising a U-shaped link 14 having a pair of stud shafts 14C rotatably and movably supported in bearing portions 13B of a base 13 and a link 15 including a frame-like portion 15A and having a pair of stud shafts 15D rotatably supported in bearing portions 13C of the base 13, ribs 14F having tapered surfaces 14G are provided along the peripheral surfaces of bosses 14D defining the center of rotation of the link 14 while holes 15E in the link 15 for mating with the bosses 14D are formed with keyways 15F. When a force tending to pull the keytop up further from it returned original position is applied to the keytop, the tapered surfaces 14G and the angular edges of the keyways 15F are forced into contact with each other. This urging force in turn urges the opposed legs 14B of the link 14 to expand apart from each other in the directions indicated by the arrows 19, whereby the link 14 is prevented from dislodging from the base 13.
|
