Force limiting weld head
This patent describes a welding apparatus including a supporting structure, a movable member and an output member mounted for movement on the supporting structure, a first electrode mounted on the supporting structure, a movable electrode driven by the output member, coupling means for drivingly coupling the output member to the movable member to move the movable electrode toward the fixed electrode whereby a workpiece can be contacted by the electrodes and can arrest movement of the output member and for allowing the movable member to move relative to the output member to over travel after movement of the output member is arrested by the workpiece, means for driving the movable member to thereby drive the output member and the movable electrode, and means responsive to relative movement between the movable member and the output member for energizing the electrodes. It comprises: the coupling means including means defining a variable-volume chamber, a fluid medium in the chamber and means responsive to the overtravel for varying the volume of the chamber.
- Assignee:
- Hughes Aircraft Co., Los Angeles, CA (USA)
- Patent Number(s):
- US 4940875; A
- Application Number:
- PPN: US s 7-313932
- OSTI ID:
- 6538803
- Resource Relation:
- Patent File Date: 22 Feb 1989
- Country of Publication:
- United States
- Language:
- English
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