Tenter frame apparatus and method
AssigneeMarshall and Williams Company
InventorsChristopher E. Hosmer, John F. Whaley
Life of this patent
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Abstract
A tenter frame is illustrated wherein a chain is fabricated by press fitting a pin receiving bushing constructed of Vespel and the like into a steel bushing and then boring a pin receiving opening therein and utilizing wear strips constructed of Vespel in a dovetail configuration opposite the tenter chain providing a lubrication free tenter wherein the chain may be tensioned without excessive stretching.
Claims16
The method of fabricating a lubrication free tenter for processing sheet material including a chain having a pin and steel bushing carried thereon opposite a tender rail comprising the steps of:
- press fitting a molded bushing liner constructed of low friction wear resistant polyimide resin or the like plastic material stable at high temperatures into said steel bushing;
- and
- then axially boring said bushing liner while press fitted into the steel bushing increasing the size of the opening therein to accommodate the pin and minimize the thickness of the liner;
- whereby breakage of the bushing liner during boring is avoided while minimized thickness thereof reduces stretching of the chain due to compression of the liner resulting from tensioning of the chain.
A lubrication free tenter for processing sheet material including a chain having a pin and steel bushing carried thereon opposite a tenter rail comprising:
- a press fitting molded bushing liner constructed of low friction wear resistant polyimide resin or the like plastic material stable at high temperatures in said steel bushing;
- and
- an axial bore in said bushing liner machined therein while said bushing liner is press fitted into the steel bushing increasing the size of the opening in said liner to accommodate the pin and minimize the thickness of the liner;
- whereby breakage of the bushing liner during boring is avoided while minimized thickness thereof reduces stretching of the chain due to compression of the liner resulting from tensioning of the chain.
Dependencies are inferred from the claim text.