Patent ID: 7234664

Claim:
A draw spring linkage comprising: an elongate hollow rod defining an interior space extending longitudinally of the rod, the hollow rod having first and second opposite ends and being formed with a shoulder structure at the first end of the rod and with a slot that extends longitudinally of the rod and is located between the shoulder structure and the second end of the hollow rod, a tongue member comprising an attachment portion and a stem that projects from the attachment portion, wherein the stem fits slidingly in the interior space of the hollow rod and is formed with a slot that is aligned with the slot in the hollow rod, a key member that extends through the slot in the tongue member and the slot in the hollow rod and projects laterally from the hollow rod, and a hollow cylindrical spring member having first and second ends, the hollow spring member being threaded by the hollow rod, the first end of the spring member engaging the shoulder structure, the second end of the spring member engaging the key member, and the spring member being held under compression between the shoulder structure and the key member.