Door operator armature connections

An armature assembly configured for use with a door control comprising a pinion having an outer cross-section, the armature assembly comprising:

• an armature including a first end portion and an opposite second end portion;
• an opening defined in the first end portion of the armature and extending along a longitudinal rotational axis, the opening having an inner cross-section corresponding to the outer cross-section such that the opening is operable to receive the pinion to rotationally couple the armature with the pinion;
• and
• a clamping collar mounted to the first end portion of the armature, the clamping collar comprising:
• an engagement tab having a coupling position and a decoupling position;
• a retention tab longitudinally offset from the engagement tab;
• a collar portion surrounding the first end portion of the armature, wherein the engagement tab extends radially inward from the collar portion;
• a pair of arms operable to expand the collar to thereby move the engagement tab from the coupling position to the decoupling position;
• and
• a rim extending inward from one end of the collar portion, wherein the engagement tab extends inward relative to the rim;
• wherein the first end portion is longitudinally captured between the retention tab and the rim to thereby prevent removal of the clamping collar from armature;
• wherein with the engagement tab in the coupling position, the engagement tab projects inward beyond a periphery of the opening and is operable to axially couple the armature with the pinion;
• and
• wherein with the engagement tab in the decoupling position, the engagement tab is inoperable to axially couple the armature with the pinion.