| US4982976A | 1991-01-08 | |||
| CN205022315U | 2016-02-10 |
| Claims: 1- A) Standing leg that stands on the ring characterized by the shape of the leg (cross supports) FIG.1 (1). B) Knuckle joint that has the same center of rotation of the fifth wheel characterized by the two cylinders inside each other and the way to connection to the standing leg FIG.1 (2). C) The Sliding plates characterized by a layer of the artelon plate and the way of connection to the knuckle joint FIG.1 (3) 2- The location of the fixation of the standing leg FIG.1 (1) that enables the move of the fifth wheel around its lateral axis in the forward drive and prevents it during turning the trailer. 3 -The circular ring with its 2 beams FIG.2 (1 ) that supports it to the chassis of the trailer and distributes the load on the 2 beams of truck chassis. 4- The location of the 2 lateral beams of the ring FIG.2 (2) in the central radius between outer and inner one and the 2 supports FIG.2 (3) to increase the load the beam can withstand and prevent the ring from waving. 5 |
Technical field:
This device is applicable in the field transportation using trucks and trailers.
Background:
The basic idea of loading is to load on 3points (minimum points to make a plan) as fellow:
1st Point: Fifth Wheel
2nd point: Right Hand Suspension Group
3rd Point: left Hand Suspension Group
Look to FIG.10
No way to load on 2 points or one point, as in 2-point loading the stability area is a tipping line not even an area and in 1-point it is a single point.
These points make the stability area of the load (the area in which the COG must be)
The Problem:
In the forward drive of the 3 point suspension there are no lateral forces that make the COG (center of gravity) tilt.
Look FIG.11
During turning of the trailer the lateral force Fix make the COG oscillate and this may turn into resonance (the amplitude of the oscillation increase continuously) in this case the load COG gets out the stability area and the load is turned upside down as a result.
Look to FIG.12 The component Fix is the responsible for the tilting of the COG .the more the turning angle, the greater the Fix value would be. Hence the tilting would increase also.
Look to the triangle in FIG.12
Examples of accidents due to this problem:
Look to the following photos:
FIG.3 , FIG.4 and FIG.5
Disclosure of the invention:
The new idea is to make two standing legs that stands on a ring connected to the chassis of the truck. These legs are connected to chassis of the trailer.
These two legs have 2 advantages;
1- damping the Oscillation of the center of gravity
2- increase the stability area as it converts the 3 point to 4 point suspension at the moment of the tilting.
The stability area for 4-point suspension is greater than 3 point suspension as follows:
Increase in stability area while tilting to the right
FIG.13 illustrate the increase if stability area.
Increase in stability area while tilting to the left look to FIG.14 Best modes to carry out the Device:
- Determine the level of fixation of the ring on the chassis of the truck so that the ring will not contact the tire after loading.
- Align of the center of rotation of the fifth wheel with the center of rotation of the 2 legs.
- Determine the diameter (inner and outer) of the ring.
Outer diameter= 180 cm Inner diameter= 120 cm
- fix the ring on the chassis of the truck.
- fix the standing leg into the trailer.
- lubricate the upper surface of the ring to slip the standing leg.
Pictures of the complete model:
Look at the following photos:
FIG.6, FIG.7 and FIG.8
Real trial of the device:
This device is already tested and used during Cairo monorail project in Egypt to transport more than 50 beams till now.
The picture of the real trial Fig.9
Brief Description of the drawing:
FIG. 1
1- Standing Leg fixation plate
2- Knuckle joint
3- Sliding plate FIG. 2
1-circular ring
2-U-beam support
3- Back support of u-beam
FIG.3, FIG.4 and FIG.5
Examples of the accidents duo to the problem
FIG.6, FIG.7 and FIG.8
Picture of the compete model
FIG.9
Cairo monorail trail of the device
FIG.10
3-point suspension
FIG.11
Normal traction of the 3-point suspension
FIG.12
Inclined traction force analysis (while turning the trailer)
FIG.13
Increase of stability area due to the right standing leg
FIG.14
Increase of stability area due to the left standing leg