Clamping and/or spreading tool

1. A clamping and/or spreading tool comprising a drive for displacement of a push or pull rod to which a movable jaw is fixed with respect to a support carrying a stationary jaw in a longitudinal direction of the push and pull rod, said drive comprising a torsion spring connected to the push or pull rod for displacement of the push or pull rod to move said movable jaw toward said stationary jaw, wherein the torsion spring comprises an unwound band section that is at least partly positioned in a seat or a groove of said push or pull rod between the support and the movable jaw and a wound band section positioned in said support and further including a handle on said support and a drive arm movable relative to said handle for moving the movable jaw toward said first jaw, said handle and said drive arm being operable by one hand.

2. The clamping and/or spreading tool according to claim 1 wherein said spring is a torsion spring fixed on said support and to said push or pull rod.

3. The clamping and/or spreading tool according to claim 1 wherein said spring is a torsion spring fixed on said support and to said movable jaw.

4. The clamping and/or spreading tool according to claim 1 wherein a point of application of force of said spring on said push or pull rod is detachable.

5. The clamping and/or spreading tool according to claim 1 wherein and the point of application of force can be shifted along said push or pull rod.

6. The clamping and/or spreading tool according to claim 1 wherein said spring is wound in said support.

7. A clamping and/or spreading tool comprising:

a support supporting a first jaw; a rod supported in said support for relative movement relative to said support; a movable jaw supported on said rod;

a spiral band spring for moving said rod to move said movable jaw toward said first jaw, said spring having a first end and a second end, said first end being wound and supported completely within said support and said second end being connected external of said support to said rod for moving said rod and further including a handle on said support and a drive arm movable relative to said handle for moving the movable jaw toward said first jaw, said handle and said drive arm being operable by one hand.

8. The clamping and/or spreading tool of claim 7 wherein said unwound portion is at least partly positioned in a seat or a groove of said rod.

9. The clamping and/or spreading tool of claim 7 wherein the first end of the spring is rotatably supported on the support.

10. A clamping and/or spreading tool comprising:

a support having a handle and supporting a first jaw; a rod having a length supported by said support for relative movement relative to said support; a movable jaw supported on said rod; a handle on said support and a drive arm movable relative to said handle for moving the movable jaw toward said first jaw, said handle and said drive arm being operable by one hand; a spiral band spring for moving said rod to move said movable jaw toward said first jaw, said spring having a end wound portion and a an unwound portion arranged such that said spring extends along the length of the rod between the support and the movable jaw, said wound portion being supported in said support and said unwound portion being connected to said rod external of said support for moving said rod.

11. The clamping and/or spreading tool of claim 10 further including a release lever occupying a first position in which it engages the rod for holding the rod in a stationary position.

12. The clamping and/or spreading tool of claim 11 wherein said release lever occupies a second position in which it is disengaged from the rod to allow the spring to move the rod.

13. The clamping and/or spreading tool of claim 10 wherein said an unwound portion-that is at least partly positioned in a seat or a groove of said rod.

14. The clamping and/or spreading tool of claim 10 wherein the first end of the spring is rotatably supported on the support.