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M & I Door Systems Limited Patents |
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Assignee: M & I Door Systems Limited
Address: Ontario, CA
No. of patents: 3
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 5964270 |
Roll-up door with low friction edges |
October 12, 1999 |
| A roll-up type industrial door including a flexible vinyl sheet forming a curtain for closing a door way having an upper end, a lower end and two opposite side edges. The sheet has a thin main area and elongate side edge sections that are thicker than the main area. A sloping shoulder is |
| 5170833 |
Compensating mechanism for variable speed roll-up door |
December 15, 1992 |
| A rolling door assembly including a flexible curtain having an inner end, an outer end and side edges. The inner end of this curtain is mounted to a rotatable curtain roll. The assembly includes a sprocket mounted on the curtain roll and a continuous chain loop that extends around this s |
| 4976302 |
Apparatus for opening and closing roll-up door |
December 11, 1990 |
| A rolling door mechanism employing an idler drive member freely supported about an idler roll of a roll door assembly. An adjusting element, for example, a coiled spring which surrounds the idler roll, accommodates differences in speed of the idler drive member and the idler roll. The |
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