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1. (WO2017097316) SHEARS
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Claims

1. Shear, in particular a pruning shear or secateur (1), comprising a first shear part (3) and a second shear part (3'), each of the first and second shear parts (3, 3') having a cutting blade (11, 11') and a shaft or lever arm (5, 5') which are arranged at opposite sides of a pivot (7), the pivot (7) rotatably connecting the first and second shear parts (3, 3') with each other, the shears further comprising a laminated or flat spring element (27) acting upon the first and second shear parts (3, 3') to move the shears on to an open position, the laminated or flat spring element

(27) comprising a first portion (27') fixedly arranged at or allocated to the first shear part (3) and a flexibly arranged second portion (27'') acting on the second shear part

(3'), wherein a longitudinal portion (39) of the laminated or flat spring element (27) is provided with at least one corrugation (41) extending in a longitudinal direction of the laminated or flat spring element (27) .

2. Shear according to claim 1, wherein the longitudinal portion (39) is formed between the first portion (27') and the second portion (27'') of the laminated or flat spring element (27) .

3. Shear according to claim 1 or 2, wherein the corrugation (41) is surrounded laterally by flat edge portions (43', 43'') of the laminated or flat spring element (27) extending in a longitudinal direction of the laminated or flat spring element (27), whereby the corrugation (41) turns on each side into the flat edge portions (43', 43'') in a transition area (45', 45'') having a curved course.

4. Shear according to any of the preceding claims, wherein the corrugation (41) is formed centrally and symmetrically be- tween the flat edge portions (43', 43' ') .

5. Shear according to any of the preceding claims, wherein a convex side (47) of the corrugation (41) is arranged on a tension side of the laminated or flat spring element (27) .

6. Shear according to any of the preceding claims, wherein the width of the second portion (21 ' ') of the laminated or flat spring (27) is smaller than the width of the longitudinal portion (39) .

7. Shear according to claim 6, wherein the longitudinal portion (39) turns into the second portion (27' ') in a rounded edge region under an angle (a) .

8. Shear according to claim 7, wherein the angle (a) is greater than 90° and smaller than 180°.

9. Shear according to any of the preceding claims, wherein the thickness of the laminated or flat spring element (27) is constant at least in the longitudinal section (39) .

10. Shear according to any of the preceding claims, wherein

first supporting means (37) are provided supporting the laminated or flat spring element (27) in a first axial direction to prevent a movement of the laminated or flat spring element (27) towards the pivot (7), comprising an end section of the shaft or lever arm (5) of the first shear part (3) and at least a part of the first portion (27') of the laminated or flat spring element (27) interacting in the direction of the longitudinal axis of the laminated or flat spring element (27) .

11. Shear according to claim 10, wherein the part of the first portion (27') of the laminated or flat spring element (27) interacting in the direction of the longitudinal axis of the laminated or flat spring element (27) is formed, preferably bent over a rounded angle, as a hook (37) .

12. Shear according to any of the preceding claims, wherein second supporting means are provided supporting at least the first portion (27') of the laminated or flat spring element (27) in radial and/or lateral directions to prevent twisting and/or bending and/or radial and/or lateral movement of the first portion (27'), comprising at least one lateral bearing or contact surface, the surface having an orientation parallel to the longitudinal axis of the laminated or flat spring element (27).

13. Shear according to any of the preceding claims, wherein at least the first portion (27") of the laminated or flat spring element (27) is at least partially arranged in a channel or groove (31) being formed at an inner surface of a handle ( 9 ) .

14. Shear according to any of the preceding claims, wherein the lever arm (5') of the second shear part (3') is shaped by providing a fulcrum (33) which is located in close distance to the pivot (7) and interacting with the second portion (27'') of the laminated or flat spring element (27) for moving the shears onto an open position.