Cord tensioner for covering for architectural openings

A cord tensioner system for anchoring one extent of an endless control cord in a covering for an architectural opening comprising in combination:

• a head rail,
• an endless cord element suspended from said headrail, and
• a tensioning unit including a housing, a pulley rotatably mounted on said housing around which said element extends, an anchor adapted for securement to a frame surrounding said architectural opening, said anchor including a plunger slidably disposed internally of said housing and a coiled spring positioned within said housing and operatively associated with said plunger and said housing to bias said housing to lift relative to said plunger when any lateral force is applied to said cord.

A cord tensioner system for anchoring one extent of an endless control cord in a covering for an architectural opening comprising in combination:

• a head rail,
• an endless control element suspended from said head rail, and
• a tensioning unit including a housing, a pulley rotatably mounted on said housing around which said element extends, an anchor adapted for securement to a frame surrounding said architectural opening, said anchor including a plunger slidably disposed relative to said housing, and a spring operatively associated with said plunger and said housing to bias said housing away from said head rail to place tension in said endless element and yieldingly resist movement of said housing toward said head rail, said plunger including a head on one end thereof having a seat in which said pulley can rest, said seat including a barb for engagement with said element when the pulley is resting in said seat, and wherein said spring is a compression spring having one end operatively seated against said head and the opposite end engaged with said housing.