Device for axial displacement of a hole saw for a hand-held drill

A device for an axial displacement of a hole saw for a hand-held drill, wherein;

• the hole saw is without a center drill bit, and is coupled directly to the drill via a drive shaft which on a first end is arranged for connection to the drill and on a second end is arranged for connection to the hole saw for thereby providing a direct transfer of a torque and an rpm from the drill to the hole saw;
• the hole saw and an actuator are rotatably connected and positioned within a housing;
• the device is provided with a coupling for the drill;
• the actuator comprises an outer threaded portion which corresponds to an inner threaded portion in the housing so that the actuator and the hole saw are displaced axially along the drive shaft when the actuator rotates relative to the housing;
• wherein;
• the actuator is connected to the drive shaft via a slip clutch arranged to transfer a reduced rpm and torque from the drive shaft to the actuator, and
• the slip clutch encircles the drive shaft;
• and
• wherein;
• the device comprises a second actuator arranged to displace a tightening element for the slip clutch, the second actuator is arranged to be operated from an outside of the housing, and wherein the second actuator is axially displaceable along the housing.

A device for an axial displacement of a hole saw for a hand-held drill, wherein;

• the hole saw is without a center drill bit, and is coupled directly to the drill via a drive shaft which on a first end is arranged for connection to the drill and on a second end is arranged for connection to the hole saw for thereby providing a direct transfer of a torque and an rpm from the drill to the hole saw;
• the hole saw and an actuator are rotatably connected and positioned within a housing;
• the device is provided with a coupling for the drill;
• the actuator comprises an outer threaded portion which corresponds to an inner threaded portion in the housing so that the actuator and the hole saw are displaced axially along the drive shaft when the actuator rotates relative to the housing;
• wherein;
• the actuator is connected to the drive shaft via a slip clutch arranged to transfer a reduced rpm and torque from the drive shaft to the actuator, and
• the slip clutch encircles the drive shaft, wherein the slip clutch comprises:
• a spring housing which is rotatably rigidly and displaceably connected to the drive shaft;
• a clutch element which is rotatably rigidly and axially displaceably connected to the actuator;
• and
• at least one spring which on a first end abuts the spring housing and on a second opposite end abuts a friction element arranged to engage with the clutch element.