Tensioning device for a door system

A tensioning assembly comprising, a bracket having a central bore, a plurality of slots circumferentially spaced relative to one another and spaced radially outward of said central bore, and a plurality of locking member receivers positioned radially outward of said central bore and circumferentially spaced relative to each other;

• a winding shaft rotatably supported by said bracket and connected to a counterbalance spring rotatable to adjust tension within said spring, said winding shaft having a socket for receipt of a tool and adapted to rotationally couple said tool to said winding shaft, whereby rotation of said tool adjusts the tension on said counterbalance spring;
• a tension plate slidably supported on said winding shaft and rotatably fixed thereto, said tension plate having a plurality of axially extending locking members extending toward said bracket, said locking members adapted to be received within said locking member receivers on said bracket to fix the rotational position of said winding shaft;
• and
• a release assembly adapted to selectively decouple said tension plate from said bracket, said release assembly including a first plate and a second plate, said first plate rotatably fixed to said tool and defining plural arcuate slots circumferentially spaced relative to one another, said second plate being coupled to said first plate by shoulder pins, said second plate carrying a plurality of fingers extending outwardly from said second plate toward said bracket and adapted to be received within said slots formed in said bracket, said fingers being circumferentially spaced with respect to one another wherein said fingers are adapted to advance upon rotation of said second plate in a first direction penetrating said slots and contacting said tension plate to urge said tension plate from a fixed rotational position.

A tensioning assembly for a door system, which includes an upwardly acting door supported by a frame and connected to a counterbalance system having a counterbalance spring, the tensioning assembly comprising:

• a tension plate coupled to the counterbalance spring and rotatable relative to the counterbalance spring, said tension plate being selectively moveable between a disengaged position where said tension plate is freely rotatable and an engaged position where said tension plate is rotationally fixed to the frame;
• means for selectively fixing the tension plate in the engaged position, whereby when in said disengaged position said tension plate is rotated relative to the counterbalance spring to adjust tension therein and said tens ion plate is returned to said engaged position to maintain the tension;
• and
• biasing means adapted to urge said tension plate toward said engaged position.

A tensioning assembly for a door system, which includes an upwardly acting door supported by a frame and connected to a counterbalance system having a counterbalance spring, the tensioning assembly comprising:

• a tension plate coupled to the counterbalance spring and rotatable relative to the counterbalance spring, said tension plate being selectively moveable between a disengaged position where said tension plate is freely rotatable and an engaged position where said tension plate is rotationally fixed to the frame;
• means for selectively fixing the tension elate in the engaged position, whereby when in said disengaged position said tension plate is rotated relative to the counterbalance spring to adjust tension therein and said tension plate is returned to said engaged position to maintain the tension;
• and
• release means for selectively urging said tension plate from the engaged position to a said disengaged position.