| 摘要 |
PURPOSE:To make key operation smooth for a long period. CONSTITUTION:The rear end part of a key 1 is supported in a freely oscillatable state on a frame 2 and energized in its return direction to restrict a key operation area by stopper pieces 1b and 1b provided on the reverse surface of the key l. A key guide 5 is formed out of a resin material by outsert molding integrally with an L-shaped key guide piece 2b formed on the frame 2 and this key guide 5 guides the internal wall surfaces of the stopper pieces 1b and 1b of the key Slide contact parts 5a-are formed on both flanks of the key guide 5 at a specific interval in the moving direction of the key 1, a recessed part 5 for lubricant storage having many projection parts 5c is formed between the slide contact parts 5a, and a lubricant which moves up and down through key operation is scraped off into the recessed part 5b by the slide contact parts 5a, provided at both ends. |
