Pitch adjustment for blades of ceiling fan

Details Pitch adjustment for blades of ceiling fan Pitch adjustment for blades of ceiling fan

1981-07-17

1983-08-02

Hornsby, Harvey C.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Adjustable

416 5, F04D 2936

Patent

active

043963528

ABSTRACT:
Two position fan blade attachments or blade iron assemblies for sealing fans provide for the individual adjustment of the paddle-type blades into two preselected angular positions providing for either a downward or upward flow of air. The blade attachments provide detents or interengaging locking cams which are maintained in either one of the preselected positions by a spring and by the centrifugal force applied to the blade. In one embodiment, the interengaging structure includes a leaf spring which has two recesses or openings engageable with a ball. In another embodiment pairs of inclined ramps are mutually engageable with corresponding pairs of camming recesses. Pushing the blade inwardly releases the engagement and permits rotation of the blade iron into the other of the preselected positions and release thereof permits movement into a second interlocking and camming position under the influence of the spring and centrifugal force to maintain a noise-free and vibration-free connection between the blade iron and the blade iron support.

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