Mechanical activator for contactor
View Patent ↗A mechanical asymmetrical activator for electrical contactors in the manufacturing of fire pump controllers comprising a flexible cable and pulley system wherein the pulling of the flexible cable engages the pulley system to activate contactor. The activator comprises a compound pulley assembly comprising a first pulley with a fixed axle and a second pulley with a free axle, an arm in cooperation with the free axle and adapted to engage the contact carrier of a contactor and a plurality of mounting attachments for engaging the auxiliary contactor mounting points of a contactor.
1. An activator for a contactor comprising a plurality of auxiliary contactor mounting points and a contact carrier, the activator comprising:
a compound pulley assembly adapted to receive a cable, said compound pulley assembly comprising a first pulley and a second pulley, said first pulley comprising a first radius and a fixed axle, said second pulley comprising a second radius and a free axle movable between a first position and a second position;
a spring for biasing said second pulley towards said first position;
an arm for engaging the contact carrier, said arm in cooperation with said free axle and movable from said first position to said second position as said second pulley moves from said first position to said second position;
a housing for encompassing said pulley assembly, said spring and said arm, said housing comprising a first housing end further comprising an aperture, a second housing end, and a plurality of mounting attachments for engaging the auxiliary contactor mounting points, wherein when said housing is mounted to the contactor said arm is engaged and aligned within the contact carrier; and
a cable for engaging said first pulley and said second pulley, said cable comprising a first cable end and a second cable end, said second cable end accessible to said housing via said aperture, threaded about said compound pulley assembly and anchored to said second end;
wherein when a drawing force is applied to the said first cable end, said cable is drawn taut causing said second pulley to move from said first position wherein the contactor is open to said second position wherein the contactor is closed.
2. The activator of claim 1 , further comprising a second arm in cooperation with said free axle for engaging a second contact carrier of a second adjacent contactor and further comprising a second plurality of mounting attachments for engaging the auxiliary contactor mounting points of said second contactor.
3. The activator of claim 1 , further comprising a handle connected to said cable for applying a drawing force to said cable from outside a fire pump controller.
4. The activator of claim 1 , wherein said second radius is larger than said first radius.