Abstract: A releasable grip-lock device for flexible elongate connectors such as ropes are used, particularly, in the cattle industry. The device is especially applicable to guillotine-type doors which are raised, maintained in a raised position in rock condition, and subsequently dropped at rather precise times so as to retain cattle in enclosures. The accommodating structure includes the principal of jaws, one of which is spring-loaded, for the purpose of gripping the rope holding the door open, for example, or actuates as a feeder which serves as a detent to keep the jaws open so that a rope will slip therethrough when a door to which the rope is attached or to which the same cooperates is dropped at desired times. A control lever is incorporated for the purpose of requiring a positive situation to urge the jaws from locked to unlocked position.