This invention relates to a quick-disconnect coupling arrangement for connecting two members of a linkage between which respective longitudinal, lateral and rotational movement is to be prevented. The prior art recognizes that, where linkage members are attached to a structure, it may be inconvenient or impossible to disconnect the linkage from that structure when removal of that structure is necessary or otherwise. In such a case, it is preferable to use two linkage members rigidly but releasably connected so as to prevent lateral or rotational movement therebetween. The most common form of such a linkage is two bars with respective left and right-hand threads and a connecting turnbuckle. Turnbuckles enjoy the significant advantage that their installation, removal and adjustment requires no special tools. The turnbuckle has its disadvantages, however, in certain applications. In order to loosen and remove a turnbuckle coupling, the turnbuckle must be unscrewed, which forces the right and left-hand threaded end portions of the respective linkage members apart longitudinally. This operational characteristic renders turnbuckles inappropriate for use where longitudinal or rotational movement of the linkage members is not possible or where it is preferable to maintain longitudinal adjustment of the linkage members. An example is vehicles having a removable machine element such as a power package, transmission, or the like, with a linkage for attachment to another machine element, such as a shifter, throttle, clutch, or the like. Removal of the removable machine element requires its disconnection from the other machine element. Longitudinal and rotational movement of the linkage members and disconnection of the members from either machine element may be impossible. Disturbing the longitudinal adjustment of the linkage is likely to be inconvenient.
Use of clevis and eye connections including a connecting pin are commonly known in the prior art. A standard pin, clevis and eye arrangement prevents longitudinal movement between adjacent linkage members, but allows relative rotation of such members about the pin. Use of a clevis pin has certain recognized disadvantages, however. The pin must be maintained in position by means of a cotter pin, retaining ring, or the like. Cotter pins tend to break, fall off, or get lost. Moreover, their application and removal requires a pair of pliers. Likewise, installation and removal of retaining rings requires a special tool. The prior art has overcome the disadvantages associated with cotter pins and retaining rings by using spring pin connectors. These connectors include a pin for insertion through the eye and clevis holes, a snap for attaching the connector to a neck on the pin or clevis, and a strap connecting the pin and snap.