A torque adjustment device of a torque wrench, comprising:
- a handle (10) having a passage (11) defined axially therethrough, a driving head (12) connected to a first end of the handle (10), a slot (13) defined axially through a wall of a second end of the handle (10);
- a torque adjustment unit (20) located in the passage (11) of the handle (10) and having a stationary member (21) connected to an inner surface of the handle (10), a threaded shaft (22) threadedly extending through the stationary member (21), a rotary member (23) and a spring (24), the threaded shaft (22) having a push end (221) on a first end thereof, the rotary member (23) threadedly mounted to a second end of the threaded shaft (22) and having outer threads (231) defined in an outer periphery thereof, a threaded rod (222) extending from the second end of the threaded shaft (22) and extending beyond the rotary member (23), multiple locking pins (232) axially extending through the rotary member (23), two ends of each locking pin (232) extending beyond two ends of the rotary member (23), the spring (24) biased between the driving head (12) and the push end (221);
- a sleeve (30) mounted to the threaded shaft (22) and located between the stationary member (21) and the rotary member (23), the sleeve (30) contacting the rotary member (23) and located corresponding to the locking pins (232), the sleeve (30) having a guide pin (32) which radially protrudes beyond the sleeve (30), the guide pin (32) extending through the slot (13) of the handle (10) so as to restrict the sleeve (30) from spinning;
- a rotary unit (40) having a tube (41) and a nut (42), the tube (41) including a mounting section (412) on a first end thereof, a threaded section (411) defined in an inner periphery of a second end of the tube (41), the threaded section (411) threadedly connected to the outer threads (231) of the rotary member (23), the mounting section (412) mounted to the handle (10), the nut (42) threadedly connected to the outer threads (231) of the rotary member (23) and located opposite to the threaded section (411) of the tube (41), the nut (42) contacting the tube (41), and
- a knob (50) threadedly connected to threaded rod (222) that extends beyond the rotary member (23), wherein when the knob (50) is removed from the threaded rod (222) and the tube (41) is rotated which drives the rotary member (23) and the threaded shaft (22) to rotate relative to the stationary member (21), the push end (221) is moved to compress the spring (24) so as to be adapted to set an output torque value of the torque wrench, the rotary member (23) drives the sleeve (30) to move axially to change position of the guide pin (32) relative to the slot (13), the knob (50) is then rotated to urge the locking pins (232) to contact against the sleeve (30) so as to be adapted to secure the output toque value.