each have integral shafts 20 a 22 a extending beyond the cover plate 18 the frame plate 12 cover plate 18 and interconnecting rivets provide a housing for the latch those skilled in the art will appreciate that a wide variety of alternative configurations may be deployed to provide the latch housing a fork ratchet 24 is pivotally mounted on the rivet 20 between the frame plate 12 and cover plate 18 the ratchet 24 includes a hook 26 and a lip 28 that extends beyond the hook the ratchet 24 also includes a primary shoulder stop 32 and a pointed secondary shoulder stop 34 the ratchet 24 is biased to an open position as shown in fig1 and 2 by a first biasing mechanism for example a substantial torsion spring 35 that is mounted on the rivet shaft 20 a and connected between the cover plate 18 and the ratchet 24 the torsion spring 35 has tangs 35 a 35 b the cover plate 18 features a slot 36 for receiving spring tang 35 a and the ratchet 24 includes a pin or rivet 38 for receiving spring tang 35 b referring additionally to the fragmentary perspective view of fig3 where plates 12 and 18 rivets and torsion springs are removed from view a pawl 40 is pivotally mounted on the rivet 22 between the frame plate 12 and cover plate 18 the pawl 40 has a shoulder 42 that interacts with the primary and secondary shoulder stops.