1. Field of the Invention
The present invention relates to a hand-held power tool which performs a predetermined operation on a workpiece by linearly driving a tool bit.
2. Description of the Related Art
In order to control a motor within a hand-held power tool between an energized state and a de-energized state, both a slide type operating member and a trigger type operating member are known. An example of the slide type is disclosed, for example, in Japanese non-examined laid-open Patent Publication No. H08-216061, and an example of the trigger type is disclosed, for example, in Japanese non-examined laid-open Patent Publication No. 2005-219195.
The slide type is applied to a hammer in which a tool bit performs only striking movement. The slide member operated by a user and an electrical switch are typically disposed in a connecting part between a power tool body and a handgrip. In the slide type, after the slide member is slid to a position in which the electrical switch is placed in an on position, the slide member is retained in that position to which it is slid even if it is released. Therefore, ease of operation can be enhanced in holding the handgrip and operating the power tool to perform a predetermined operation.
The trigger type is applied to a hammer drill in which a tool bit performs striking movement and rotation. In such a hammer drill, both a trigger and an electrical switch are disposed in a grip part of a handgrip. The electrical switch is placed on an on position when the trigger is depressed, and it is automatically returned to the off position when the trigger is released. In a construction using the trigger type, a vibration-proof structure using an elastic element is provided in a connecting part which connects the handgrip and the power tool body, so that vibration of the handgrip can be reduced and thus load on the user can be alleviated.
With a construction in which the slide type is applied as a manner of operating the electrical switch, as described above, ease of operation can be enhanced, but the handgrip does not have a vibration-proof structure so that a load on the user is increased. On the other hand, with a construction of the trigger type, the handgrip can have a vibration-proof structure, but the user has to maintain the depressing operation of the trigger, so that ease of operation is decreased.