Abstract: A low profile keyswitch utilizes a telescoping plunger assembly. A linear feel and overtravel are achieved. The telescoping plunger assembly includes an outer plunger shaft and an inner plunger shaft slideably mounted therewithin for telescopic extension therefrom. A retaining member locks one end of the inner plunger shaft within the outer plunger shaft, thereby defining the maximum extension of the inner plunger. A spring biases the inner plunger into its fully extended position.

Abstract: A capactive keyswitch utilizes an arrangement of three spring forces to provide a linear feel, hysteresis, and overtravel. A telescoping plunger assembly includes an outer plunger shaft and an inner plunger shaft slideably mounted therewithin for telescopic extension therefrom. A first spring provides a return force to maintain the keyswitch in its non-actuated condition. A switch actuator is coupled to the inner plunger shaft and includes a resilient foam pad (second spring) to provide resilient contact with a switching element when the plunger is moved to an actuated position. A third spring between the outer plunger shaft and the switch actuator urges the switch actuator, and thereby the inner plunger shaft, into its fully extended position.