| 摘要 |
The invention pertains to the method and apparatus for twisting or bending the arms formed upon fan spiders, particularly of the type used to draw air through the cooling radiators of internal combustion engines. Such fans include a fan spider which defines the fan hub, and a plurality of radially extending arms project from the hub. Twisting of the arms to provide the desired pitch to the fan blades is achieved by firmly clamping the spider hub portion upon opposite sides while simultaneously, individually, clamping each arm outer region. Thereupon each arm outer region is simultaneously pivoted about an axis substantially perpendicularly disposed to the axis of the spider hub to impart the desired pitch to the spider arm. Clamping of the arms is accomplished by relatively movable components utilizing uniquely related rotatable portions whereby the two parts of the clamp which are to be rotated are coaxially aligned when clamping and bending.
|
