Howard W Robison

US Patent:

39604659, Jun 1, 1976

Filed:

Dec 19, 1974

Appl. No.:

5/534464

Inventors:

Howard A. Robison - Long Beach CA

International Classification:

F04D 2932

US Classification:

416169R

Abstract:

There is disclosed a detachable lock mechanism which can be installed on automotive-type cooling fans having a conventional fan clutch connection between the fan and the fan drive shaft. The lock mechanism functions by providing a positive mechanical lock between the drive shaft and the cooling fan, thereby bypassing the drive clutch and its function. The locking mechanism provides a desirable positive lock to insure maximum fan speed when operating a vehicle in low gears and low forward speeds. The device is of particular value for off-road service of recreational vehicles and the like which are often operated for extended periods in low gears, conducive to overheating. In these applications, the operation of the fan clutch is detrimental to adequate engine cooling and a mechanical locking mechanism thereby serves a useful function in avoiding overheating of these vehicles. Various locking mechanisms are disclosed including simple detachable brackets which are preferably carried by the flanged end of the fan drive shaft and which have a dependent arm that projects into a locking engagement with the cooling fan.