Patent ID: 6300583
Filing Date: 2001-10-09
Classification: H01H

Abstract:
A key structure comprising:a key top;a base plate;a scissors type linkage formed between the key top and the base plate for supporting the key top to move upward and downward relative to the base plate, the scissors type linkage comprising a first lever pivotally engaged with a second lever at a pivotal point formed on the first lever;a first engaging pin formed at a bottom end of the first lever;a second engaging pin formed between the pivotal point and the bottom end of the first lever, the second engaging pin being spaced from the first engaging pin to form a receiving slot therebetween; anda constraint means formed on the base plate to engage the bottom end of the first lever, the constraint means including a substantially horizontally extending first sliding surface facing the base plate and a substantially vertically extending second sliding surface facing the pivotal point, the constraint means being loosely received in the receiving slot formed on the first lever,wherein when the key top is pressed downward, the first engaging pin slides horizontally along the first sliding surface, and the second engaging pin slides vertically along the second sliding surface.