Holding device for percussion tool

A holding device for holding a tool bit for use in a percussion apparatus comprising:

• a tool bit carrier made of a hollow cylindrical member having a given length for carrying the tool bit therein along the length, said tool bit carrier having formed in a side wall thereof at least one opening;
• at least one locking member disposed within the opening of said tool bit carrier;
• a first locking member holder movable between a first holding position and a first release position in a lengthwise direction of said tool bit carrier, in the first holding position, said first locking member holder engaging a first portion of said locking member to establish engagement of said locking member with a groove formed in the tool bit for locking the tool bit in said tool bit carrier, in the first release position, said first locking member holder being placed out of engagement with the first portion of said locking member;
• a second locking member holder movable between a second holding position and a second release position in a circumferential direction of said tool bit carrier, in the second holding position, said second locking member holder engaging a second portion of said locking member to establish engagement of said locking member with the groove of the tool bit for locking the tool bit in said tool bit carrier, in the second release position, said second locking member holder being placed out of engagement with the second portion of said locking member;
• and
• a hollow cylindrical grip provided around said tool bit carrier, connected to said first and second locking member holders, said hollow cylindrical grip being movable both in the lengthwise direction and in the circumferential direction of said tool bit carrier, movement in the lengthwise direction causing said first locking member holder to be moved from the first holding position to the first release position, movement in the circumferential direction causing said second locking member holder to be moved from the first holding position to the second release position, when said first and second locking member holders are placed in the first and second release positions, respectively, it will cause the engagement of said locking member with the groove of the tool bit to be released.