All plastic hinge having a non-rising pin and method of making the same
OwnerFrank F. Hayes, Sr., Frank F. Hayes, Jr +1inventors
InventorsFrank F. Hayes, Sr., Frank F. Hayes, Jr, John C. Hayes
Life of this patent
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Abstract
There is disclosed an all plastic hinge for hanging conventionally sized doors for buildings and the like. Means are provided to prevent the pin from rising out of the passage afforded by the hinge halves by establishing a preferred direction of pin movement in the pin inserting direction. An enlargement in the pin receiving passage is created by differentially shrinking the knuckle surrounding the passage during the process of manufacture.
Claims4
A method of making a door hinge half comprising hinge leaf having a plurality of knuckles thereon providing an axial pin receiving passage wherein one of the knuckles provides axially spaced first and second passages of lesser and greater dimension transverse to the axis respectively, comprising
- placing an organic polymeric material in a mold having a knuckle cavity traversed by a mold pin, of generally constant cross-sectional dimension, establishing the passage sections;
- creating a temperature differential in the mold wherein the mold adjacent the second passage section is hotter than adjacent first passage section;
- withdrawing the molded hinge half from the mold when the temperature of the knuckle adjacent the second passage section is greater than the temperature of the knuckle adjacent the first passage section;
- cooling the knuckle to ambient temperature and allowing the knuckle adjacent the second passage section to shrink a greater amount than adjacent the first passage section.
Dependencies are inferred from the claim text.