A tool-holding device (11) for holding a tool (13) on a work machine with a retaining unit (20) and with a lock unit (30). The lock unit (30) can be transferred from a receiving position into a fixing position, and the retaining unit (20) comprises a receiving section (21) for holding the lock unit (30) at least in sections. The lock unit (30) comprises a tool-holding section (33) for holding a tool (13) in a pre-positioned manner. A work machine with this tool-holding device and a method for positioning a tool (13) on a work machine are also disclosed.

A blade mounting device allows a blade of a pushing cut tool that cuts a workpiece by pushing a cutting edge forward to be mounted on an impact tool. This blade mounting device has a blade mounting portion for mounting the blade on the blade mounting device and a tool mounting portion secured to the blade mounting portion in order to mount the blade mounting device on the impact tool. The blade mounting portion has a front end portion where an inverted tapered hole complementary to an inclined shape surface formed on a tang of the blade is formed. The tool mounting portion is provided with a through hole perpendicular to the center axis and a center hole that reaches a through hole from a front side end surface of the tool mounting portion along the center axis.

A blade mounting device allows a blade of a pushing cut tool that cuts a workpiece by pushing a cutting edge forward to be mounted on an impact tool. This blade mounting device has a blade mounting portion for mounting the blade on the blade mounting device and a tool mounting portion secured to the blade mounting portion in order to mount the blade mounting device on the impact tool. The blade mounting portion has a front end portion where an inverted tapered hole complementary to an inclined shape surface formed on a tang of the blade is formed. The tool mounting portion is provided with a through hole perpendicular to the center axis and a center hole that reaches a through hole from a front side end surface of the tool mounting portion along the center axis.

An impact tool head assembling mechanism is provided, including: an engaging sleeve, disposed on a front end of an impact tool, including a tubular wall and at least one projection, the tubular wall defining an axial direction, the at least one projection being protrudingly and retractably disposed on an inner wall of the tubular wall; an impact tool head, including a rod body and a flange which includes an inclined surface facing toward the front end and an outermost peripheral edge, a contact position being defined as a position where the inclined surface contact with the at least one projection; wherein a reference plane is defined as passing through the outermost peripheral edge and perpendicular to the axial direction, and an included angle between a line from the contact position to the outermost peripheral edge and the reference plane is between 25 and 65 degrees.

An impact tool head assembling mechanism is provided, including: an engaging sleeve, disposed on a front end of an impact tool, including a tubular wall and at least one projection, the tubular wall defining an axial direction, the at least one projection being protrudingly and retractably disposed on an inner wall of the tubular wall; an impact tool head, including a rod body and a flange which includes an inclined surface facing toward the front end and an outermost peripheral edge, a contact position being defined as a position where the inclined surface contact with the at least one projection; wherein a reference plane is defined as passing through the outermost peripheral edge and perpendicular to the axial direction, and an included angle between a line from the contact position to the outermost peripheral edge and the reference plane is between 25 and 65 degrees.

A method of retaining a hammer tool in the front head of a powercell assembly of a hammer assembly includes biasing a hammer tool retaining pin such that a portion of the tool retaining pin extends into a tool receiving bore of the front head of the powercell assembly, holding a hammer tool in the tool receiving bore of the front head of the powercell assembly via the tool retaining pin, and releasing the hammer tool remotely from the hammer assembly.

A method of retaining a hammer tool in the front head of a powercell assembly of a hammer assembly includes biasing a hammer tool retaining pin such that a portion of the tool retaining pin extends into a tool receiving bore of the front head of the powercell assembly, holding a hammer tool in the tool receiving bore of the front head of the powercell assembly via the tool retaining pin, and releasing the hammer tool remotely from the hammer assembly.

A percussion tool is used for performing a chiseling operation on a workpiece with a chisel. The percussion tool comprises a housing including a cylinder portion, a tool holder coupled to the cylinder portion for holding the chisel, and a percussion mechanism including a striker supported for reciprocation in the cylinder portion. The percussion mechanism is configured to impart repeated axial impacts to the chisel with the striker. The percussion tool further comprises a flange between the cylinder portion and the tool holder. Movement of the chisel within the tool holder toward the percussion mechanism is stopped by the flange.

A bit retention device has an upper support member having an inner surface and an outer surface. A lower support member fixed to the upper support member. A stationary plate is mounted to the inner surface of the upper support member. A clamp plate opposes the stationary plate and is spring biased toward the stationary plate and slidably moveable between the upper support member and the lower support member.

A bit retention device has an upper support member having an inner surface and an outer surface. A lower support member fixed to the upper support member. A stationary plate is mounted to the inner surface of the upper support member. A clamp plate opposes the stationary plate and is spring biased toward the stationary plate and slidably moveable between the upper support member and the lower support member.