Torsion release mechanical control node for cable operated fire suppression systems
An activation system includes a housing and a pulley mounted to the housing. The pulley is rotatable about an axis. An activation member is movable between a first position and a second position relative to the pulley to selectively couple to the pulley. When the activation member and the pulley are coupled, rotation of the pulley about the axis is restricted. A first tension member is operably coupled to the activation member and a first tension of the first tension member maintains the activation member in engagement with the pulley. At least one second tension member is wrapped about at least one of the pulley and the activation member and has a second tension acting on the at least one of the pulley and the activation member.
1 . An activation system comprising:
a housing;
a pulley mounted to the housing, the pulley being rotatable about a shaft defining an axis;
an activation member disposed on the shaft and movable along the shaft between a first position where the activation member is coupled to the pulley and a second position wherein the activation member is free of the pulley, wherein when the activation member is in the first position and coupled to the pulley, a rotation of the pulley about the axis is restricted;
a first cable operably coupled to the activation member, wherein a first tension of the first cable exerts a tension in a first direction to maintain the activation member in engagement with the pulley;
a biasing member operably coupled to the activation member and configured to continuously urge the activation member to the second position, wherein the first tension opposes a biasing force of the biasing member; and
a second cable wrapped about the pulley, the second cable having a second tension acting on the pulley; wherein a release of tension by the first cable allows the biasing member to move the activation member to the second position so as to be free of the pulley, allowing the second cable to rotate the pulley.
2 . The activation system of claim 1 , wherein the first cable is arranged at an angle to the second cable.
3 . The activation system of claim 2 , wherein the first cable is orthogonal to the second cable.
4 . The activation system of claim 1 , wherein a third cable is wrapped about an exterior of the activation member.
5 . The activation system of claim 1 , wherein the second cable is wrapped about an exterior of the pulley.
6 . The activation system of claim 1 , wherein the biasing member is arranged within an interior of the shaft.
7 . The activation system of claim 1 , wherein the activation member further comprises a key and the pulley further comprises a keyway, the key being receivable within the keyway when the activation member is coupled to the pulley.
8 . The activation system of claim 7 , wherein the housing further comprises an opening axially aligned with the keyway, the key being receivable within the opening when the activation member is coupled to the pulley.
9 . The activation system of claim 1 , wherein the first cable is operably coupled to a detection device.
10 . The activation system of claim 1 , wherein the second cable is operably coupled to one of a control box and an actuator.