Remotely resettable fire damper

Claim 2

In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable link thermally actuatable between a closed and opened condition, comprising a bimetallic element cantilevered from a support connected to said damper and having a narrow neck portion intermediate the free end and the supported end, which element is thermally responsive to open and close said link; and a retraction means connected to said damper cooperating with said link to move said blades from their unfolded to their folded condition and retain them in their folded condition upon actuation from outside said damper.

Claim 3

The invention of claim 1 wherein said link has a pin extending from the free end of said element toward said support for engaging said retraction means.

Claim 4

The invention of claim 2 wherein said neck is narrower at the end thereof most remote from said support.

Claim 5

In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable link connected to said damper; and a retraction means comprising an arm pivotally connected to said damper; said arm adapted to mechanically interlock with said link when said blades are in a folded condition and retain them in their folded condition; and a flexible member connected to the free end of said arm and coacting with said damper to pivot said arm and fold said blades upon retraction from outside said damper.

Claim 6

In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable link connected to said damper; and a retraction means comprising an arm pivotally connected to said damper; said arm adapted to mechanically interlock with said link when said blades are in a folded condition and retain them in their folded condition; and a flexible member connected to the free end of said arm and coacting with said damper to pivot said arm and fold said blades upon retraction from outside said damper.

Claim 7

The invention of claim 4 wherein in the unfolded condition said arm is disposed on one side of said blades and said flexible member passes about the free end of one of said blades.

Claim 8

The invention of claim 4 wherein said damper has a frame and said flexible member extends beyond said frame in both the folded and unfolded condition.

Claim 9

The invention of claim 2 wherein said link comprises a bimetallic element having a pin extending from one end presenting a beveled surface to the free end of said arm.

Claim 10

The invention of claim 4 wherein said arm has a guide means at its free end to guide it into engagement with said link.

Claim 11

In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable link connected to said damper; and a retraction means connected to said damper cooperating with said link to move said blades from their unfolded to their folded condition and retain them in their folded condition upon actuation from outside said damper; said link comprising a bimetallic element cantilevered from a support thermally actuatable between a closed and opened condition of engagement and disengagement with said retraction means; and a second element cantilevered from said support; said elements being electrically insulated from each other and from said support; said elements comprising an electric switch.

Claim 12

In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable link connected to said damper; and a retraction means connected to said damper cooperating with said link to move said blades from their unfolded to their folded condition and retain them in their folded condition upon actuation from outside said damper; said link comprising a bimetallic element cantilevered from a support thermally actuatable between a closed and opened condition of engagement and disengagement with said retraction means; and a second element cantilevered from said support; said elements being electrically insulated from each other and from said support; said elements comprising an electric switch.

Claim 13

The invention of claim 9 wherein said second element is resilient and is movable between a flexed position in engagement with said bimetallic element and an unflexed position when no longer engaging said bimetallic element.

Claim 14

The invention of claim 9 wherein said switch remains closed while said link engages said retraction means.

Claim 15

In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable link connected to said damper; and a retraction means connected to said damper cooperating with said link to move said blades from their unfolded to their folded condition and retain them in their folded condition upon actuation from outside said damper; said resettable link comprising a bimetallic element cantilevered from a support and having engagement means at the free end thereof for engaging said retraction means; said bimetallic element being thermally actuatable between a closed and opened condition of engagement and disengagement with said retraction means and being substantially closed by a shroud.

Claim 16

In combination with a folding blade damper having blades movable between a folded and unfolded condition, the improvement comprising: a resettable link connected to said damper; and a retraction means connected to said damper cooperating with said link to move said blades from their unfolded to their folded condition and retain them in their folded condition upon actuation from outside said damper; said resettable link comprising a bimetallic element cantilevered from a support and having engagement means at the free end thereof for engaging said retraction means; said bimetallic element being thermally actuatable between a closed and opened condition of engagement and disengagement with said retraction means and being substantially closed by a shroud.