Manual screwdriver

A manual screwdriver comprising:

• a handle defining a cavity and a slot communicating the cavity to exterior space;
• a screwdriver head at one end of the handle;
• a rotation connector rotatably received in the cavity, the screwdriver head being coupled to the handle via the rotation connector;
• a spiral rod defining a spiral groove and being rotatably received in the cavity;
• an operating arm slidably received in the spiral groove with at least one end of the operating arm extending from the cavity through the slot;
• a first elastic element, wherein the handle comprises a first main body and a cap releasably connected to one end of the first main body, the first elastic element is sleeved onto the first main body, the cap defines a barrier having an annular engaging surface extending radially outward from one of two ends of the cap, the handle further comprises a bush coupled to the operating arm, the bush is sleeved onto an outer wall of the first main body, the bush defines two insertion holes for receiving the at least one end of the operating arm extending from the cavity, and the first elastic element is engaged between the engaging surface of the barrier and the bush;
• and
• wherein the spiral rod can be driven by the operating arm to engage or disengage the rotation connector, and when the spiral rod and the rotation connector are combined together into an engaged state, the operating arm can slide toward the screwdriver head in the spiral groove to drive the spiral rod and the rotation connector to rotate about an axis of rotation with respect to the handle, thereby enabling the screwdriver head to synchronously and circularly rotate with the rotation connector.