Self loading container

The container of claim 1, wherein said means of claim 1b comprise:

• a. container front and rear legs that can selectively be extended, retracted or locked in pairs, or in unison, the respective choice of which is governed by the horizontal forward setting of a coupling operating shaft perpendicular to, and with its one end accessible from, the exterior side wall of said container, said shaft retained by one bearing in said container exterior side wall and at least one bearing mounted in the interior of said container, said interior bearing aligned with the other end of said shaft, and
• b. said coupling operating shaft of claim 3a having three forward settings, each of said settings selected by manually rotating an exterior coupling operating knob on the end of said shaft thereby causing worms mounted on said shaft in the interior of said container to helically interact with worm gears mounted on perpendicular interior shafts, whereby said knob can be set off from said exterior side wall of said container at alternate distances determined by the number of turns applied to said knob, and
• c. the default setting termed engaged is the most forward positioned of said three forward settings of claim 3b, where said exterior knob on said coupling operating shaft abuts a coupling interval lock that is slidingly mounted on the exterior of said wall with only a coupling operating shaft washer between them, and
• d. the intermediate forward setting termed front lock is selected by dialing back said operating knob to separate it from said interval lock by a predetermined distance, whereupon this setting can be secured in place by vertically displacing said interval lock to engage with a corresponding circumferential groove in said coupling operating shaft serving as a forward motion stop for said shaft, and
• e. the least forward positioned setting termed neutral is selected by further dialing back said operating knob to separate it from said interval lock by a further predetermined distance, whereupon this setting can be secured in place by vertically displacing said interval lock to engage with another corresponding circumferential groove in said coupling operating shaft serving as a second forward motion stop for said shaft, and
• f. said container rear legs of claim 3a, the vertical extension of which can optionally and temporarily be locked in place with an exterior leg lock, and
• g. said container front and rear legs of claim 3a, the length of which can be adjusted in real time as may be required by the vertical loading distance between a said starting and a receiving surfaces and as may further be required by headroom height limitations of a receiving surface, and
• h. said container front and rear legs of claim 3a that provide for both top and bottom motion stops to limit their vertical movement, and
• i. said container front and rear legs of claim 3a that can optionally accept auxiliary rolling means attached to their bottoms that do not need to be detached when legs are retracted above the container bottom level as is needed for self loading,
• whereby the use of extendable legs can be a stable, precise and effective way to change the vertical level of said self-loading container for the purpose of then horizontally transferring said container onto a receiving surface, but attaching the main rolling means of container to its extendable legs as in prior art is not a structurally stable way for its weight bearing movement on horizontal surfaces.