Insertable tool and tool holder for drilling and/or impacting electric machines

A tool holder of an electrical machine for drilling and impact operation, said tool holder comprising

• a receiving sleeve (21) including a front portion (21a) for sealing and guidance of an insertable tool (2) having a tool shaft (11) and another portion (21b) including a plurality of radially inwardly protruding longitudinal cleats (25) for rotary driving of the insertable tool (2);
• an impact bolt (24) arranged for impact on the tool shaft (11) of the insertable tool when the tool is inserted in the receiving sleeve (21);
• and
• at least one locking body (23) arranged between two adjacent ones of said longitudinal cleats (25) so that said at least one locking body is radially movable between a position locking the insertable tool in the receiving sleeve and another position in which the insertable tool is released from the receiving sleeve.

A combination of an insertable tool (2) for an electrical machine for drilling and impact operation and a tool holder (20) of the electrical machine for the insertable tool;

• wherein the insertable tool comprises a tool shaft (11) provided with a round core cross section (1) not weakened or reduced at any point along the tool shaft up to an end of the tool shaft inserted in the tool holder (20), said tool shaft (11) has a cylindrical end portion (3) at said end of the tool shaft inserted in the tool holder and a plurality of longitudinal struts (6) for torque transmission to and axial guidance of the tool shaft (11), said longitudinal struts (6) extend from the tool shaft (11) beyond the round core cross section (1) and are distributed uniformly around a circumference of the tool shaft, at least one of said longitudinal struts has a rear end face (8b) for axial locking and said longitudinal struts (6) are shaped to merge with the core cross section in front of said cylindrical end portion (3);
• and
• wherein the tool holder (20) comprises a receiving sleeve (21) including a front portion (21a) for sealing and guidance of said insertable tool (2) and another portion (21b) including a plurality of radially inwardly protruding longitudinal cleats (25) engagable between said longitudinal struts (6) for rotary driving of the insertable tool (2) when the insertable tool (2) is inserted in the tool holder, an impact bolt (24) arranged for impact on the tool shaft (11) of the insertable tool when the insertable tool is inserted in the receiving sleeve (21) and at least one locking body (23) arranged between two adjacent ones of said longitudinal cleats (25) so that said at least one locking body (23) is radially movable between a locking position locking the insertable tool (2) in the receiving sleeve (21) and another position in which the insertable tool is released from the receiving sleeve.

A tool holder of an electrical machine for drilling or impact operation, said tool holder comprising

• a receiving sleeve (21) including a front portion (21a) for sealing and guidance of an insertable tool (2) having a tool shaft (11) and another portion (21b) including a plurality of radially inwardly protruding longitudinal cleats (25) for rotary driving of the insertable tool (2);
• an impact bolt (24) arranged for impact on the tool shaft (11) of the insertable tool when the tool is inserted in the receiving sleeve (21);
• and
• at least one locking body (23) arranged between two adjacent ones of said longitudinal cleats (25) so that said at least one locking body is radially movable between a position locking the insertable tool in the receiving sleeve and another position in which the insertable tool is released from the receiving sleeve.

A combination of an insertable tool (2) for an electrical machine for drilling or impact operation and a tool holder (20) of the electrical machine for the insertable tool;

• wherein the insertable tool comprises a tool shaft (11) provided with a round core cross section (1) not weakened or reduced at any point along the tool shaft up to an end of the tool shaft inserted in the tool holder (20), said tool shaft (11) has a cylindrical end portion (3) at said end of the tool shaft inserted in the tool holder and a plurality of longitudinal struts (6) for torque transmission to and axial guidance of the tool shaft (11), said longitudinal struts (6) extend from the tool shaft (11) beyond the round core cross section (1) and are distributed uniformly around a circumference of the tool shaft, at least one of said longitudinal struts has a rear end face (8b) for axial locking and said longitudinal struts (6) are shaped to merge with the core cross section in front of said cylindrical end portion (3);
• and
• wherein the tool holder (20) comprises a receiving sleeve (21) including a front portion (21a) for sealing and guidance of said insertable tool (2) and another portion (21b) including a plurality of radially inwardly protruding longitudinal cleats (25) engagable between said longitudinal struts (6) for rotary driving of the insertable tool (2) when the insertable tool (2) is inserted in the tool holder, an impact bolt (24) arranged for impact on the tool shaft (11) of the insertable tool when the insertable tool is inserted in the receiving sleeve (21) and at least one locking body (23) arranged between two adjacent ones of said longitudinal cleats (25) so that said at least one locking body (23) is radially movable between a locking position locking the insertable tool (2) in the receiving sleeve (21) and another position in which the insertable tool is released from the receiving sleeve.