Releasable coupling device

A releasable coupling device comprising:

• a body comprising an aperture;
• a sleeve positioned at least partially around, and moveable relative to, at least a portion of the body, the sleeve being moveable between an open position in which at least a portion of the aperture is at least partially unoccluded so as to permit coupling of the device to an attachment receivable within the aperture, and a closed position in which at least the portion of the aperture is at least partially occluded so as to resist decoupling of the device by removal of the attachment from the aperture;
• the device defining a track configured to guide the attachment receivable within the aperture along a movement path;
• a coiled spring configured to urge the sleeve into the closed position, and wherein the coiled spring is locatable within the body;
• a slide positioned within the sleeve and slidable relative to the body in contact with the spring;
• and
• a lock for limiting or preventing movement of one or more of the sleeve, the slide and the coiled spring.

A releasable coupling device, comprising:

• (a) an elongated body with an aperture, penetrating transversely through the elongated body, disposed at a distal end thereof and having an opening to a side of the elongated body in a direction generally perpendicular to a primary axis of the elongated body, wherein the aperture and the distal end of the elongated body define a hook;
• and
• (b) a structural retaining sleeve system including a sleeve, wherein the sleeve has an open distal end with slots opening toward the distal end, and wherein the sleeve fits around the elongated body and is longitudinally adjustable between a closed position, wherein the sleeve is disposed around the hook, the slots are transversely aligned with the aperture, and a covering portion of the sleeve fully covers the opening to the aperture in the side of the elongated body, and an open position, wherein the sleeve is retracted to uncover the opening to the aperture in the side of the elongated body;
• (c) wherein, in the closed position, a track is defined by the aperture and the slots such that when viewed from a side, the track includes at least two distinct regions or lobes, each defining a respective primary ring retention area, that are separated by a step or protrusion;
• (d) wherein an attachment may be inserted into the aperture while the sleeve is in the open position but retained in the track while the sleeve is in the closed position;
• and
• (e) wherein, while retained in the track while the sleeve is in the closed position, the attachment tends to remain in a particular one of the at least two distinct regions or lobes thereof with the step or protrusion providing a physical obstacle to the attachment moving from the particular one of at least two through-hole regions or lobes to another of the at least two through-hole regions or lobes.