Speed changer for variable gear tools - has snap action annular guide to hold cylindrical member with gear cluster engaging projection

摘要

The speed-changing device includes an annular guide member adapted to snap into an opening in the gear-box housing for firmly holding the device in the housing. A cylindrical member is rotatably mounted in the annular guide member and defines a longitudinal axis of rotation. A head piece is securely mounted on the cylindrical member and has an elongated projection extending therefrom eccentric to this axis. The elongated projection engages the gear cluster to move the same from one position to another in response to a manual actuation of the cylindrical member. The cylindrical member is configured to contact the guide member to conjointly define a sealing interface.