Cantilever butterfly shutter door closer
AssigneeGSI Group Corporation
InventorJoshua Sander
Life of this patent
Estimating the term…
Abstract
A closing assembly for a butterfly shutter is biased to move a shutter door to a closed position. The closing assembly has a cable connecting to the shutter door, a spring, a bracket having a pivot arm and a spring mount arm extending from the pivot arm. The closing assembly has an asymmetric crank, where the spring is attached to a first portion of the asymmetric crank, a second portion of the asymmetric crank is attached to the pivot arm to form a pivot and a third portion receives the cable such that the spring pulls on the shutter door through the asymmetric crank and the cable. The shape of the spring mount arm and of the asymmetric crank are such that the acting pull force on the shutter door produced by the spring is higher when the shutter door is in the closed position.
Claims17
A butterfly fan assembly having a propeller to generate an airflow through a sidewall opening in an animal house and a butterfly shutter configured to move between an open condition when the propeller is operating to allow passage of the airflow and a closed condition when the propeller is not producing the airflow, the butterfly shutter having a closing assembly that is biased to move a shutter door of the butterfly shutter from an open position to a closed position, the closing assembly comprising:
- a cable connected to the shutter door;
- a spring;
- a bracket having an elongate pivot arm and a spring mount arm extending from a first end of the elongate pivot arm, wherein the spring mount arm receives a proximal end of the spring;
- and
- an asymmetric crank, wherein a distal end of the spring is attached to a first portion of the asymmetric crank, a second portion of the asymmetric crank is attached to a second end of the elongate pivot arm of the bracket to form a pivot about which the asymmetric crank is configured to pivot and a third portion of the asymmetric crank receives one end of the cable, wherein the spring provides an acting pull force on the shutter door through the asymmetric crank and the cable;
- wherein shapes of the spring mount arm and of the asymmetric crank are such that the acting pull force on the shutter door produced by the spring is higher when the shutter door is in the closed position than when the shutter door is in the open position.
A butterfly fan assembly having a propeller to generate an airflow through a sidewall opening in an animal house and a butterfly shutter configured to move between an open condition when the propeller is operating to allow passage of the airflow and a closed condition when the propeller is not producing the airflow, the butterfly shutter having a closing assembly that is biased to move a shutter door of the butterfly shutter from an open position to a closed position, the closing assembly comprising:
- a cable;
- a spring;
- a bracket having an elongate pivot arm, the bracket configured to receive a first end of the spring at a first end of the elongate pivot arm;
- and
- an asymmetric crank, wherein:
- a second end of the spring is attached to a first portion of the asymmetric crank;
- a second portion of the asymmetric crank is attached to a second end of the bracket to form a pivot about which the asymmetric crank is configured to pivot;
- and
- a third portion of the asymmetric crank receives a second end of the cable, wherein the spring provides an acting pull force on the shutter door through the asymmetric crank and the cable.
A butterfly fan assembly, comprising:
- a propeller;
- a butterfly shutter having a closing assembly that is biased to move a shutter door of the butterfly shutter from an open position to a closed position, the closing assembly comprising:
- an elongated bracket coupled to the shutter door at a first end of the elongated bracket;
- a spring coupled to a second end of the elongated bracket at a first end of the spring;
- a cable attached to the shutter door at a first end of the cable;
- and
- an asymmetric crack, wherein:
- the cable extends from the shutter door to a first portion of the asymmetric crank;
- the first end of the elongated bracket is attached to a second portion of the asymmetric crank;
- and
- a second end of the spring is attached to a third portion of the asymmetric crank, the asymmetric crank configured to pivot about the second portion during opening and closing of the shutter door.
Dependencies are inferred from the claim text.