Operating and speed control mechanism for revolving doors

Details Operating and speed control mechanism for revolving doors Operating and speed control mechanism for revolving doors

1974-11-13

1976-07-13

Downey, Kenneth

Movable or removable closures

Plural wings radiate from common pivot; i.e., revolving

With speed regulator

188185, E05D 1502

Patent

active

039685950

ABSTRACT:
An operating and speed control mechanism for revolving doors features an improved gearing arrangement which makes possible a gear ratio of reduction between the drive motor shaft and door shaft far greater than any gear reduction heretofore attainable, even when using a greater number of gears in the allotted space. Additionally, the improved gear transmission renders the mechanism even more compact than the most favorable prior art arrangements in the interest of satisfying more stringent architectural requirements in the installation of revolving doors. Unexpected benefits provided by the improved and simplified gearing are increased braking efficiency and extra braking force from a small centrifugal brake assembly, and greater and more efficient lubricant circulation in the mechanism for the purposes of brake surface wetting and general lubrication and cooling of the mechanism. A unique mechanism cover plate provides a magnetic flux return path allowing one-half of the permanent magnet motor to be eliminated and thereby rendering the mechanism further compact in its critical vertical dimension.

REFERENCES:
patent: 2029318 (1936-02-01), Hagenbook
patent: 3717954 (1973-02-01), Sheckells

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