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US 4,981,637 AGranted
Method of forming an improved wiper blade
AssigneeJMK International, Inc.
InventorMichael L. Hyer
Life of this patent
Estimating the term…
Abstract
A method is shown for forming a wiper blade in which a continuous length of elastomer is extruded through a die having a die opening shaped to produce a pair of wiper blades joined in edge-to-edge relation. The elastomer is preformed to produce a weakened mid- section and then cured. The cured elastomer is then separated into two separate lengths of wiper blade by pulling the length of continuous elastomer along the weakened mid-section.
Claims4
A method of forming a wiper blade, comprising the steps of:
- extruding a continuous length of curable elastomer through a die having a die opening shaped to produce a pair of wiper blades joined at a mid-section thereof in edge-to-edge relation;
- preforming the mid section of the continuous length of extruded elastomer prior to curing to produce a weakened mid-section that facilitates the subsequent separation of the elastomer into a pair of wiper blades;
- then
- curing the continuous length of extruded elastomer;
- and then
- separating the length of continuous elastomer into two separate lengths of wiper blade by pulling apart the length of continuous elastomer along the score line.
3 more elements
A method of forming a wiper blade, comprising the steps of:
- extruding a continuous length of curable elastomer through a die having a die opening shaped to produce a pair of wiper blades joined at a mid-section thereof in edge-to-edge relation, said continuous length of curable elastomer having a top and bottom surfaces which define a thickness therebetween;
- preforming the mid section of the continuous length of extruded elastomer as it leaves the extruder die and prior to curing by passing the continuous length of elastomer through a preforming means for initially dividing the continuous length of extruded elastomer along the mid-section thereof into separate halves, the separate halves being united immediately thereafter, to thereby produce a weakened mid-section which facilitates the subsequent separation of the elastomer into a pair of wiper blades;
- thereafter, curing the continuous length of extruded elastomer;
- and then
- separating the length of continuous elastomer into two separate lengths of wiper blade by pulling the separate lengths apart along the weakened mid-section.
2 more elements
Dependencies are inferred from the claim text.