US Patent 10325734 Keyboard switch

A keyboard switch includes a key top movable vertically on receiving a depressing force, a plunger engaged with a lower portion of the key top and movable vertically with the key top, a cup rubber disposed under the plunger and supporting the plunger from below, a housing arranged on an outer peripheral side of the plunger and cup rubber, a plate supported on the housing and extending laterally, and a spacer interposed between the plate and key top. The spacer is removably mounted onto the keyboard.