Kitchen ventilating system

Claim 1

IN A KITCHEN VENTILATOR, A DAMPER ARRANGED TO CLOSE AND OPEN THE VENTILATOR, SPRING MEANS FOR CLOSING SAID DAMPER, A SLIDABLY MOUNTED CONTROL ROD HAVING AN INNER END PIVOTALLY CONNECTED WITH THE DAMPER FOR OPENING THE DAMPER BY INWARD SLIDING MOVEMENT OF THE CONTROL ROD, A TUBULAR MEMBER TELESCOPICALLY MOUNTED ON THE OUTER END OF SAID CONTROL ROD FOR RELATIVE SLIDING MOVEMENT THEREON, A KNOB ON THE OUTER END OF SAID TUBULAR MEMBER FORMING A STOP ENGAGEABLE WITH THE OUTER END OF SAID CONTROL ROD TO LIMIT THE INWARD MOVEMENT OF SAID TUBULAR MEMBER RELATIVE TO SAID CONTROL ROD, A CATCH PROJECTION ON SAID CONTROL ROD, A LATCH BAR EXTENDING LONGITUDINALLY ABOVE SAID CONTROL ROD, SAID LATCH BAR HAVING A PIVOTALLY MOUNTED INNER END AND HAVING AN OUTER END PORTION WITH A NOTCH TO ENGAGE SAID CATCH BY GRAVITY FOR HOLDING THE DAMPER OPEN AGAINST THE CLOSING FORCE OF SAID SPRING, A SLOPING CAM SURFACE ON THE OUTER END OF SAID LATCH BAR, A CAM PLATE ON SAID TUBULAR MEMBER ENGAGEABLE WITH SAID CAM SURFACE BY OUTWARD SLIDING MOVEMENT OF SAID TUBULAR MEMBER ON SAID CONTROL ROD WHEN SAID KNOB IS PULLED OUTWARD TO LIFT SAID LATCH BAR AND RELEASE SAID CATCH SO THAT SAID SPRING WILL CLOSE THE DAMPER CAUSING SAID CONTROL ROD TO SLIDE OUTWARD, SAID DAMPER BEING OPENED BY PUSHING SAID KNOB INWARD AGAINST THE OUTER END OF SAID CONTROL, AND A SOLENOID HAVING A RECIPROCAL ARMATURE, AND MEANS OPERABLE BY RECIPROCATION OF SAID ARMATURE IN ONE DIRECTION TO LIFT SAID LATCH BAR TO RELEASE POSITION.