Variable speed switch and electric power tool with the variable speed switch mounted thereto

摘要

A variable speed switch includes a switch main body portion which is accommodated in a housing of an electric power tool and mounted to the housing so as to be capable of relative movement, and a load sensor which is provided in the switch main body portion and capable of outputting an electric signal in proportion to the amount of distortion caused by a pressing force. The switch operating portion is mounted on the surface of the housing so as to be capable of relative displacement with respect to the housing and transmits a pressing force applied to the switch operating portion to the load sensor, with the maximum displacement amount of the switch operating portion being set to equal to or less than 5 mm.

主权项

1. An electric power tool comprising:
an electric motor; a housing; a switch operating portion; a variable speed switch that outputs an electric signal for increasing or decreasing the amount of electric power supplied to the motor in proportion to a displacement amount of the switch operating portion; and a control circuit that inputs the electric signal and adjusts the electric power supplied to the motor; wherein: the variable speed switch further comprises:
a switch main body portion accommodated in the housing and mounted to the housing such that the switch main body portion is not relatively moved with respect to the housing; anda load sensor connected to the switch main body portion and capable of outputting an electric signal in proportion to the amount of distortion caused by a pressing force, andthe switch operating portion is configured to cover an opening provided in the housing and be mounted on a surface of the housing so as to be capable of relative displacement with respect to the housing and transmits the pressing force applied to the switch operating portion to the load sensor, with the maximum amount of the relative displacement of the switch operating portion being set to equal to or less than 5 mm, andthe switch operating portion is formed of an elastic material and waterproofly seals the opening.