Metal deforming – By relatively receding work-engaging tool-faces – Embodying three or more tools
Patent
1990-09-12
1991-09-10
Larson, Lowell A.
Metal deforming
By relatively receding work-engaging tool-faces
Embodying three or more tools
72452, B21D 4102
Patent
active
050463497
ABSTRACT:
An expansion tool (1) for pipes with a basic tool body (2) includes 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) sliding 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) is journaled on a cylinder pin (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 slot running in a curve around its swivel axis, in which slot the cylinder is guided in both directions of the movement of the expanding mandrel.
REFERENCES:
patent: 720322 (1903-02-01), Burkholder
patent: 3052828 (1962-09-01), Phinizy
patent: 4890472 (1990-01-01), Rothenberger
Larson Lowell A.
Rothenberger Werkzeuge-Maschinen GmbH
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