Patent ID: 6087604
Filing Date: 2000-07-11
Classification: H01H

Abstract:
A keyboard comprising:a key top held on a base plate in such a way as to freely ascend and descend;an elastic member for upwardly pressing said key top; andfirst and second levers for holding said key top so that said key top freely ascends and descends,wherein said first and second levers are combined with each other by pivotally supporting members, each of said pivotally supported members is formed between first and second ends of a corresponding one of said first and second levers, in such a way as to intersect each other,wherein said first lever has:a first latching portion for catching said first end thereof on said base plate; anda second latching portion for engaging said second end thereof on said key top,wherein said second lever has:a first latching portion for catching said second end thereof on said base plate; anda second latching portion for catching said first end thereof with said key top,wherein said first latching portions of said first and second levers are caught on said base plate, and said second latching portions of said first and second levers are caught on said key top, so that a ratio of a dimension from said first latching portion of said first lever to said pivotally supporting member thereof to a dimension from said pivotally supporting member thereof to said second latching portion thereof is equal to a ratio of a dimension from said first latching portion of said second lever to said pivotally supporting member thereof to a dimension from said pivotally supporting member thereof to said second latching portion thereof, andwherein said second latching portions of said first and second levers are placed outside said first latching portions of said first and second levers when said key top descends.