Expansion tool for hollow working parts

Details Expansion tool for hollow working parts Expansion tool for hollow working parts

B - Operations, Transporting

21

D

253/16

B21D 39/20 (2006.01) B21D 41/02 (2006.01)

Patent

CA 2024394

ABSTRACT OF THE DISCLOSURE An expansion tool (1) for pipes with a basic tool body (2) with two hand levers (3, 12), one of which (12) operates an expanding mandrel (5) with a free rotating cylinder (19) through a control mechanism (10). By activating the lever, the expanding mandrel emerges from the basic body (2), eliding at a preset stroke against a set (15) of radially moving expanding wedges (16). In order to allow the enforced withdrawal of the expanding mandrel (5) with reduced operating forces and a specific force distribution, the cylinder (19) has a shouldered cylinder axis (19a). The expanding mandrel is connected to the movable hand lever (12) through a retraction device (20). In one form of construction with a cam shaped control mechanism (10), the retraction device (29) consists of a tension member with working points on the cylinder (19) and on the hand lever (12). In another form of construction the control mechanism has a slit running in a curve shape around its swivel axis, in which the cylinder is guided in both directions of the movement of the expanding mandrel.

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