Patent ID: 7554287

Claim:
A device for locking an electric tool with a rechargeable battery pack, comprising at least one locking bar mounted an one element selected from the group consisting of the electric tool and the rechargeable battery pack in a manner that allows it to move against a spring force, whereby when the electric tool and the rechargeable battery pack are joined, said looking bar is engaged in succession in a first and a second recess of the other element selected from the group consisting of the electric tool and the rechargeable battery pack, and is retained tightly in said second recess by a force of a spring and, to release a lock, is manually disengaged from said second recess, wherein said locking bar is engaged in said first recess while being disengaged from said second recess, and wherein during engagement of said locking bar in said first recess, said rechargeable battery pack is retained against unintended disengagement from the electric tool.