The disclosure relates to a screwdriver attachment for screws, which has a first shaft section with a first longitudinal axis, and a second shaft section with a second longitudinal axis. The second shaft section is coupled to the first shaft section via a linking disk. The first shaft section has a free end with which the screws are turned. The first shaft section and second shaft section are connected to one another by a spring element, which aligns the first shaft section in a starting position in which the first longitudinal axis and the second longitudinal axis are aligned coaxially. Screws can be readily turned with the screwdriver attachment according to the disclosure, even if there is a certain offset between the axes.

A power tool includes a main housing, a drive mechanism, a working head, and a connection assembly. The connection assembly includes an input portion connected to the drive mechanism and an output portion connected to an output shaft. The connection assembly rotates the working head about a first axis relative to the main housing. The power tool includes a first transmission path. When the working head rotates about the first axis relative to the main housing, components in the first transmission path are allowed to deform or to be displaced along a direction of the first transmission path.

Expandable spinal implants, systems and methods are disclosed. An expandable spinal implant may include a first endplate, a second endplate, and a moving mechanism that is operably coupled to the first and second endplates. The moving mechanism may include a wedge, a first sliding frame and a second sliding frame disposed on opposite sides of the wedge, a screw guide housing a rotatable first set screw and a rotatable second set screw opposite the first set screw. The first set screw may be operably coupled to the second sliding frame and the second set screw may be operably coupled to the wedge. The moving mechanism may operably adjust a spacing between the first and second endplates upon simultaneous rotation of the first and second set screws and operably adjust an angle of inclination between the first and second endplates upon translating the first set screw or second set screw.

A ratchet may include a ratchet head and a drive assembly supported by the ratchet head. The drive assembly includes a yoke rotationally supported in the ratchet head, a spline rotationally supported in the yoke. The spline is rotatable about a spline rotation axis, and an anvil is at least partially supported in the spline. The anvil is rotatable with the spline, the anvil having an anvil rotation axis, the anvil rotation axis positionable at an angle relative to the spline rotation axis.

A power tool includes a main housing, a drive mechanism, a working head, and a connection assembly. The connection assembly includes an input portion connected to the drive mechanism and an output portion connected to an output shaft. The connection assembly rotates the working head about a first axis relative to the main housing. The power tool includes a first transmission path. When the working head rotates about the first axis relative to the main housing, components in the first transmission path are allowed to deform or to be displaced along a direction of the first transmission path.

A flexible head joint for a tool, such as a motorized ratcheting-type tool. The flexible joint also allows an output mechanism of the tool, such as a ratchet head, to be disposed at an angle with respect to a housing to the tool, which houses a motor. For example, the first shaft is pivotably coupled to a first connector, which may have a tongue shaped portion. The second shaft is pivotably coupled to a second connector, which may have a slotted portion adapted to receive the tongue portion. This provides two pivot points that have parallel axes.

A rotational tool locking device includes a handle, a drive head, a locking assembly, and an operating button. The drive head is pivotally mounted at one end of the handle, and the locking assembly is arranged between the handle and the drive head. The operating button is set on the handle and can control the locking assembly to be in a fixed or released state relative to the drive head. When in the released state, the drive head can be easily rotated relative to the handle to a specific angle, presenting different pitch positions.

A universal adjustable wrench includes a wrench body, a worm, and a movable jaw. The wrench body includes a handle and a first jaw head. The first jaw head has a worm groove and a slide surface. The slide surface has a rail groove and a fixed jaw having a first gripping surface. The worm is pivotally connected in the worm groove. The movable jaw is connected to the rail groove, and has a rack and a jaw body. The jaw body has a second gripping surface and a guide surface. The second gripping surface defines a gripping alignment line and a gripping opening inclination. The second gripping surface includes a biting surface section having at least two biting teeth and an anti-slip surface section having a plurality of anti-slip teeth. The wrench has a quick-release or quick-lock function, without wearing the corners of workpieces.

An anti-slip wrench has a handle. The handle has a first jaw and a second jaw. An upper portion of a first gripping surface of the first jaw has a first anti-slip surface. The first anti-slip surface has a plurality of first anti-slip teeth that are connected in sequence and extend laterally. The first anti-slip teeth each have a back face and a front face. The angle between the back face and a tooth profile reference line is defined as a tooth back inclination. The second jaw has a second gripping surface. An upper portion of the second gripping surface has a second anti-slip surface. The second anti-slip surface has a plurality of second anti-slip teeth that are connected in sequence and extend laterally. The second anti-slip teeth are oriented in a direction opposite to that of the first anti-slip teeth.

An engaging structure for a hand tool includes a main body. The main body has a mounting element. The mounting element includes multiple first recessed portions, multiple second recessed portions, and multiple locking sides. Each of the first recessed portions is provided with two grooves. Each of the second recessed portions is provided with a first curved face. Each of the locking sides has a planar shape. Each of the locking sides is arranged between two of the second recessed portions. Each of the first recessed portions is formed on one of the locking sides. The locking sides construct a first hexagon. The first hexagon has a center provided with a central axis. The first hexagon has six side faces. Each of the six side faces coincide with each of the locking sides.