A draw spring linkage includes a hollow rod 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 includes an
attachment portion and a stem that projects from the attachment portion.
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
extends through the slot in the tongue member and the slot in the hollow
rod and projects laterally from the hollow rod. A hollow cylindrical
spring is threaded by the hollow rod. The first end of the spring engages
the shoulder structure, the second end of the spring engages the key, and
the spring is held under compression between the shoulder structure and
the key.