Spanner tool

1. A spanner tool, comprising a connecting piece ( 1 ), a control piece ( 2 ) and a rotating piece ( 3 );

wherein two ends of the connecting piece ( 1 ) are respectively hinged with one end of the control piece ( 2 ) and one end of the rotating piece ( 3 ); such that when the control piece ( 2 ) and the rotating piece ( 3 ) respectively turn to limiting positions at different sides of the connecting piece ( 1 ), an angle β formed between the control piece ( 2 ) and the connecting piece ( 1 ) is less than an angle α formed between the rotating piece ( 3 ) and the connecting piece ( 1 );

wherein the rotating piece ( 3 ) comprises a shell ( 31 ), a connecting block ( 32 ), a central spindle ( 33 ), an elastic element ( 34 ), an adjusting nut ( 35 ) and rotating elements ( 36 );

wherein one end of the connecting block ( 32 ) is hinged with the connecting piece ( 1 ), the other end of the connecting block ( 32 ) is provided with a platform ( 322 ); the central spindle ( 33 ) is provided with a joint ( 331 ) at one end and a cylindrical platform ( 332 ) at the other end; the rotating elements ( 36 ) are disposed between the platform ( 322 ) of the connecting block ( 32 ) and the platform ( 332 ) of the central spindle ( 33 ); the elastic element ( 34 ) and the adjusting nut ( 35 ) are sleeved on the joint ( 331 ) of the central spindle ( 33 ); the adjusting nut ( 35 ) engages with the shell; and the elastic element ( 34 ) is between the cylindrical platform ( 332 ) of the central spindle and the adjusting nut ( 35 ).

2. The spanner tool according to claim 1 , wherein, the connecting piece ( 1 ) comprises an intermediate connecting rod ( 11 ); each of the two end faces of the intermediate connecting rod ( 11 ) is provided with a chamfer, the two chamfers are disposed at different sides of an axis of the intermediate connecting rod ( 11 ); the control piece ( 2 ) or the rotating piece ( 3 ) can turn and get across a corresponding one of the chamfers, and is pressed against and positioned by the intermediate connecting rod ( 11 ); the two end faces of the intermediate connecting rod ( 11 ) are right angle faces 118 respectively at the sides opposite to the chamfers; when it is turned to be on a straight line with the connecting piece ( 1 ), the control piece ( 2 ) or the rotating piece ( 3 ) is pressed against and positioned by the intermediate connecting rod ( 11 ).

3. The spanner tool according to claim 2 , wherein, the control piece ( 2 ) is fixedly positioned when it is turned across the chamfer and gets perpendicular to the connecting piece ( 1 ); and the angle a formed between the rotating piece ( 3 ) and the connecting piece ( 1 ) is greater than 90 degrees and less than 180 degrees when the rotating piece ( 3 ) is turned across the chamfer and gets fixedly positioned.

4. The spanner tool according to claim 3 , wherein, two ends of the intermediate connecting rod ( 11 ) are provided respectively with a first groove and a second groove; one end of the control piece ( 2 ) is provided with a flat convex platform ( 222 ); the flat convex platform ( 222 ) is provided with a round platform ( 223 ) at its root; one end of the rotating piece ( 3 ) is provided with a flat protuberance ( 321 ); the flat protuberance ( 321 ) is provided with a platform ( 322 ) at its root; and the flat protuberance ( 321 ) and the flat convex platform ( 222 ) respectively match with the first groove ( 116 ) and the second groove ( 117 ).

5. The spanner tool according to claim 3 , wherein, the intermediate connecting rod ( 11 ) has an axially extending bore ( 111 ); an inner pressing spring ( 13 ) and two intermediate pressing pins ( 12 ) are disposed in the axially extending bore ( 111 ); and the two inner pressing pins ( 12 ) are disposed at two sides of the inner pressing spring ( 13 ) respectively, and extend through the axially extending bore ( 111 ) partially to press against the control piece ( 2 ) or rotating piece ( 3 ).

6. The spanner tool according to claim 2 , wherein, the rotating piece ( 3 ) is fixedly positioned when it is turned across the chamfer and gets perpendicular to the connecting piece ( 1 ); the angle β formed between the control piece ( 2 ) and the connecting piece ( 1 ) is less than 90 degrees when the control piece ( 2 ) is turned across the chamfer and gets fixedly positioned.

7. The spanner tool according to claim 6 , wherein, two ends of the intermediate connecting rod ( 11 ) are provided respectively with a first groove and a second groove; one end of the control piece ( 2 ) is provided with a flat convex platform ( 222 ); the flat convex platform ( 222 ) is provided with a round platform ( 223 ) at its root; one end of the rotating piece ( 3 ) is provided with a flat protuberance ( 321 ); the flat protuberance ( 321 ) is provided with a platform ( 322 ) at its root; and the flat protuberance ( 321 ) and the flat convex platform ( 222 ) respectively match with the first groove ( 116 ) and the second groove ( 117 ).

8. The spanner tool according to claim 6 , wherein, the intermediate connecting rod ( 11 ) has an axially extending bore ( 111 ); an inner pressing spring ( 13 ) and two intermediate pressing pins ( 12 ) are disposed in the axially extending bore ( 111 ); and the two inner pressing pins ( 12 ) are disposed at two sides of the inner pressing spring ( 13 ) respectively, and extend through the axially extending bore ( 111 ) partially to press against the control piece ( 2 ) or rotating piece ( 3 ).

9. The spanner tool according to claim 2 , wherein, two ends of the intermediate connecting rod ( 11 ) are provided respectively with a first groove and a second groove; one end of the control piece ( 2 ) is provided with a flat convex platform ( 222 ); the flat convex platform ( 222 ) is provided with a round platform ( 223 ) at its root; one end of the rotating piece ( 3 ) is provided with a flat protuberance ( 321 ); the flat protuberance ( 321 ) is provided with a platform ( 322 ) at its root; and the flat protuberance ( 321 ) and the flat convex platform ( 222 ) respectively match with the first groove ( 116 ) and the second groove ( 117 ).

10. The spanner tool according to claim 9 , wherein, the round platform ( 223 ) of the control piece ( 2 ) is provided with a nick ( 226 ) at a side where the chamfer of the intermediate connecting rod ( 11 ) is located; a notch ( 110 ) is provided on an outer surface of the intermediate connecting rod ( 11 ) for accommodating the nick ( 226 ) of the round platform ( 223 ).

11. The spanner tool according to claim 2 , wherein, the intermediate connecting rod ( 11 ) has an axially extending bore ( 111 ); an inner pressing spring ( 13 ) and two intermediate pressing pins ( 12 ) are disposed in the axially extending bore ( 111 ); and the two inner pressing pins ( 12 ) are disposed at two sides of the inner pressing spring ( 13 ) respectively, and extend through the axially extending bore ( 111 ) partially to press against the control piece ( 2 ) or rotating piece ( 3 ).

12. The spanner tool according to claim 1 , wherein, several grooves ( 324 ) are evenly distributed on the platform ( 322 ) of the connecting block ( 32 ); the cylindrical platform ( 332 ) of the central spindle ( 33 ) has several holes ( 333 ) evenly distributed in its outer end face; and the rotating elements ( 36 ) are placed in the holes ( 333 ).

13. The spanner tool according to claim 1 , wherein, one end of the rotating piece ( 3 ) is provided with a first seat ( 38 ), which is provided with a second hinging hole ( 323 ) and limit grooves; one end of the control piece ( 2 ) is provided with a second seat ( 220 ), which is provided with a first hinging hole ( 224 ) and positioning grooves; each end of the connecting piece ( 1 ) is provided with a button ( 17 ); a spring ( 18 ) is sleeved on a lower end of the button ( 17 ); an intermediate portion of the button ( 17 ) is provided with a convex plate ( 171 ); and the convex plate ( 171 ) matches with the limit grooves and the positioning grooves; and an upper end of the button ( 17 ) extends through the connecting piece ( 1 ).