Patent ID: 8793933

Claim:
An assembly comprising a spring break protection mechanism and a spring plug for connecting a balancing spring of a sectional door system to said spring break protection mechanism, said spring break mechanism comprising: a base plate having a first substantially circular opening for receiving a balancing axle of said sectional door system; a ratchet wheel rotatably arranged at a first side of said base plate, said ratchet wheel being arranged to cooperate with said balancing axle; a pawl pivotably connected to said base plate at said first side, wherein the pawl is pivotable between a first position, in which the ratchet wheel is free-running, and a second position in which the pawl blocks the ratchet wheel; an extension attached to said pawl and extending from said pawl to beyond a second side of said base plate, wherein said base plate and said spring plug are arranged for bayonet mount interaction with each other, and wherein when said spring plug is placed against said second side of said base plate and then rotated for bayonet connection, part of said spring plug pushes said extension so as to force said pawl in said first position, and when said spring plug is then rotated in an opposite direction, said pawl moves into said second position, to block the ratchet wheel so as to avoid rotation of the balancing axle.