Brief description of the drawings
• FIG. 2 is a cutaway front view of the both legs in a landing gear with a cross shaft of prior art.
• FIG. 3 is a schematic illustration of the bending of the cross shaft when the legs of a landing gear of prior art rest on uneven ground. Large amounts of stress are being generated to the bushings and pinion gears.
• FIG. 4 and 5 are schematic illustrations of the bending of the cross shaft of prior art when the legs of the landing gear are diverted from each other, and converging toward each other, respectively;
• The telescopic cross shaft has 4 loose joint, Fig. 19 on page 7, at number 102, and is always adjusting telescopically drastically reducing or eliminating these stresses
Brief description of the drawings cont.
• FIG. 6 is a cross-section view through the cross shaft, when a torque T is applied to the cross shaft 44 , the stress on the cross shaft is substantially tangential to the surface of the cross shaft 44 as illustrated by arrow S .
• In other words, the torsion stress on the cross shaft 44 is translated into a tension and shear stress in the extreme fiber of the material of the cross shaft. The extreme fibers referred to herein are those fibers located farthest from the axis of rotation of the shaft.
• FIG. 7, 8 and 9 are partial side views of one end of the cross shaft on a landing gear of prior art, showing the various stages during a typical failure of the cross shaft:
• FIG. 9 demonstrate the result of a test that was performed by dropping a loaded trailer carrying 50 000 lbs, the landing gear was set too low for the fifth wheel of a truck and the truck was moved ahead dropping the trailer 6 times.
• FIG. 14 is a cross-section view through an end of the telescopic cross shaft through a typical stub shaft of a landing gear.
• FIG. 15 and 16 are cross-section views through an end of the telescopic cross shaft after having been subjected to excessive bending and torsional stress respectively;
• FIG. 17 is a partial top view of an end of the telescopic cross shaft that has been subjected to excessive torsional stresses;
• FIG. 18 is a cross-section view through an end of the telescopic cross shaft that has been subjected to excessive torsional stresses; and also demonstrate the result of a test that was performed by dropping a loaded trailer carrying 50 000 lbs, the landing gear was set too low for the fifth wheel of a truck and the truck was moved ahead dropping the trailer 15 times. This telescopic cross shaft was still in good working order.
• FIG. 19 shows a telescopic cross shaft installed on a typical landing gear parked on uneven ground, shown by the letter B .
• No stress is on the landing gear components because of the 4 loose joints, number 102.
• There is no pushing in or pulling out tension between the two stub shafts of the landing gear number 42, as tubing number 76 , slides freely inside of tubing number 72, automatically adjusting itself.
• Tubing number 76, has a anti-seize coating to help prevent corrosion.
• All tubing are primarily coated with a anti-rust paint.
Conclusion
• The round shaft has only one direction to go during failure, it has to tear outward as it is tight against the stub shaft of the landing gear, also the extreme fiber of a round tube with a drilled hole is located directly at the edge of the drilled hole, shown in FIG 8 on page 5, at number 58.
• The square telescopic cross shaft has room for the material to bunch up making it almost tear proof, the extreme fiber being at the round edge of the square tubing as shown in FIG 18 on page 6, as the letter A, and C being the pressure point of the bolt, the bolt can exert lots of pressure to C, before A can feel any pressure at all.
• Quick install and removal, no cutting, no drilling or welding just bolt-on with no need to remove legs(jacks). Relieves pressure and tension within the gear boxes allowing them to move freely and extend gear box life.
