A DC speed regulating switch

Abstract

The invention provides a DC speed control switch. The DC speed control switch is characterized in that a movable contact is mounted on a shell through an elastic part in a monolithic movement manner; a driving part moves under stress when being pressed by using an external force, therefore the obstruction of the movable contact is relieved, the elastic part releases energy to push the movable contact to perform monolithic movement to be in contact with a fixed contact for connection, and as the driving force for pushing the movable contact to perform monolithic movement is the elastic force provided by the elastic part and independent of the magnitude of force for pressing the driving part, silver contacts on the movable contact and the fixed contact can be prevented from being damaged by extrusion regardless of the magnitude of force applied by a user for pressing the driving part; besides, the movable contact is mounted on the shell in a monolithic movement manner, compared with the prior art, the DC speed control switch provided by the invention has the advantages that complex rotational relation is avoided, so that the structure is simple, the manufacturing difficulty is low, the production cost is low and the mounting difficulty is low.

Description

technical field [0001] The invention relates to the technical field of electric switches, in particular to a DC speed regulating switch. Background technique [0002] DC speed control switches are widely used in the field of hand-held electric tools, such as electric drills, electric grinders, electric wrenches, and electric screwdrivers. The head assembly, the reversing mechanism used to control the steering of the motor, and the speed regulating mechanism used to adjust the speed. However, in the prior art, the movable contact is generally fixed on a movable frame that can move up and down. When the movable frame is pressed down, the movable contact moves with the movable frame, thereby contacting and connecting with the static contact; The contacts and static contacts are generally silver contacts. When the force of the movable frame is pressed down, the pressure between the movable contacts and the static contacts is relatively high, which easily damages the silver cont...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical defects of the DC speed control switch in the prior art, which can avoid the damage of the dynamic and static contacts caused by excessive pressure on the movable frame, which is difficult to manufacture and high in production cost, thereby providing a kind of difficult-to-manufacture Small size, low production cost, and at the same time, it can avoid the damage of the dynamic and static contacts caused by pressing the movable frame too hard

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