A surgical instrument includes a handle assembly having a gear drive mechanism. The gear drive mechanism includes a variable radius gear to provide a desired mechanical advantage to a user during actuation of a movable handle of the surgical instrument.

An ice auger handle attachment assembly that includes a first bushing with a recess on the end side for a first pin of a handle, a second bushing with two symmetrical flat side surfaces made on the part of the length of the second bushing and having arcuate recesses that form stops. The second bushing partially covers the first bushing and is attached thereto by means of a stud fixed on the end of the handle. Further, a blocking element and the second pin pass through a slot in the second bushing and a hole in the stud. A spring is mounted on the stud between the first and second bushings, and a fork-shaped lever covering the second bushing in the area of the flat side surfaces and hinged thereon by means of the second pin.

An adapter is arranged to secure to a rotary device. The adapter includes a handle rotatable about an axis, and a coupler extending from and coaxial with the handle. The coupler is adapted to engage the rotary device via traction elements for simultaneously rotating the rotary device and the handle.

An adapter is arranged to secure to a rotary device. The adapter includes a handle rotatable about an axis, and a coupler extending from and coaxial with the handle. The coupler is adapted to engage the rotary device via traction elements for simultaneously rotating the rotary device and the handle.

A handle assembly for a surgical tool including a handle having a distal end, and a first retaining mechanism attached to the distal end of the handle. The retaining mechanism includes a first retaining housing having a first central cavity for receiving a surgical tool, and a first locking mechanism moveable between first and second positions relative to the housing, the locking mechanism including a through hole for receiving the surgical tool. The handle assembly further includes a second retaining mechanism attached to a proximal end of the handle. The second retaining mechanism includes a second retaining housing having a second central cavity for receiving a handle extension, and a second locking mechanism moveable between first and second positions relative to the second retaining housing, the second locking mechanism having a through hole for receiving the handle extension.

A mud mixer includes a tool body, and an electric motor supported by the tool body that is configured to rotate a mixing element about a rotation axis. The mud mixer further includes a first handle fixedly coupled to the tool body and extending from the tool body along a handle axis, a plane angled relative to the rotation axis and defined as an extension of the handle axis, and a second handle rotatably coupled to the tool body about the rotation axis and extending from the tool body in a direction parallel to the plane.

A mud mixer comprises a housing defining a battery mounting portion, an electric motor supported by the housing, a mixing element that selectively receives torque from the motor, causing the mixing element to rotate about a rotation axis, and a battery pack removably coupled to the battery mounting portion for providing power to the electric motor when coupled to the battery mounting portion. When the battery pack is coupled to the battery mounting portion, the rotation axis intersects the battery pack.

A handle assembly for a surgical tool including a handle having a distal end, and a first retaining mechanism attached to the distal end of the handle. The retaining mechanism includes a first retaining housing having a first central cavity for receiving a surgical tool, and a first locking mechanism moveable between first and second positions relative to the housing, the locking mechanism including a through hole for receiving the surgical tool. The handle assembly further includes a second retaining mechanism attached to a proximal end of the handle. The second retaining mechanism includes a second retaining housing having a second central cavity for receiving a handle extension, and a second locking mechanism moveable between first and second positions relative to the second retaining housing, the second locking mechanism having a through hole for receiving the handle extension.

A surgical instrument includes a handle assembly having a gear drive mechanism. The gear drive mechanism includes a variable radius gear to provide a desired mechanical advantage to a user during actuation of a movable handle of the surgical instrument.

An adapter is arranged to secure to a rotary device. The adapter includes a handle rotatable about an axis, and a coupler extending from and coaxial with the handle. The coupler is adapted to engage the rotary device via traction elements for simultaneously rotating the rotary device and the handle.