as bell shaped cam lock 86 the cam lock 86 may be spring biased to the locked position shown in fig1 or may be configured so that gravity pulls the cam lock to the locked position the cams 85 are sufficiently away from the leading edge of bell shaped cam lock 86 and wall 83 that an operator may move the lift cords 12 up ramp 93 from the position shown in dotted line in fig1 this motion causes the leading edge of the cam lock 86 to rise moving the cams to the release position shown in fig1 as in the previous embodiments the cam lock 86 allows the operator to pull the lift cords to raise the blind when that happens the cams will be positioned as in fig1 this cord lock is configured to fit into the end of a headrail we prefer to provide a cover 88 over the slot 92 through which the lift cords exit the cord lock the cord lock shown in fig1 through 14 could be alternately configured to have a release arm 90 shown in fig1 a carrier 89 is attached to the top of wall 83 release arm 90 has a two bends that define a central portion 96 that is held by the carrier 89 the front portion of the release arm has an eyelet 91 through which the lift cords 12 pass the opposite end of the release arm is bent to.