Coil forming system having an expandable mandrel
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United States of America Patent
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N/A
Issued Date -
Aug 28, 2003
app pub date -
Feb 25, 2002
filing date -
Feb 25, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A coil spring forming system includes a mandrel having at least a portion that is selectively expandable so that a central portion of a resulting coil spring has a larger dimension than reduced diameter end sections of the spring. In one example, a plurality of coil shaping surfaces are supported relative to a central portion of the mandrel using a plurality of linkages. The coil shaping surfaces are moved using an actuator (i.e., hydraulic or pneumatic) between expanded and contracted positions to selectively vary the largest outside dimension of the mandrel. In one example, the coil shaping surfaces are spaced apart from each other in the expanded position. In another example, the coil shaping surfaces are arranged such that the mandrel has a generally continuous outer periphery when the surfaces are in the expanded position.
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