Flexible extension conduit

The present invention provides a flexible extension conduit, in which a basic unit includes a joint base, two joints, two ball valves, a sliding pipe, two dirt covers, a flat pipe, two damping collars and two embedded retainers, and so on. Therein the embedded retainer is placed in the caulking groove of the ball valve so that the caulking groove of the embedded retainer catches the catching rim in the caulking groove of the ball valve. The sliding pipe is put in the ball valve and welded a thrust collar at the smaller end to limit the sliding range of the sliding pipe in the ball valve, and the combined ball valve is located in the spherical bearing consisting of the joint base and the joint. When the earth crust moves or the temperature gets a great changing, the dirt cover can prevent the sand and the soil from seeping in, and the conduit can change the length and bend an angle in each section. If a greater extension and a bigger flexibility are needed, more than one basic units can be connected together to provide more free space for extending and pivoting.

BACKGROUND OF THE INVENTION 
(1) Field of the Invention 
The present invention relates to a flexible extension conduit, and more 
particularly to the conduit with simple construction and higher 
flexibility for transmission of petrol or high pressure liquid. 
(2) Description of Prior Art 
In accordance with a common laying conduit so far, the seamless steel tube 
is employed mostly. If meeting channel or river as laying underground, the 
conduit should change the direction or erect a conduit bridge to keep off. 
In this way, an elbow of the seamless steel tube has to be welded at the 
place in which the conduit should change the direction to connect two 
tubes at different directions, in this case, the joint is a rigid 
connection, so the flexibility of it seems to be not enough, therefore the 
conduit is easy to be deformed by the dead weight of itself, especially to 
meet earth quake or crust shrinkage caused by soft soil which may cause 
the connecting area to break up. For this sake, an elastomer connector is 
used as an angle fitting to connect to the seamless steel tube with two 
flanges at both ends. In this way, the elastomer connector provides a 
certain flexibility to bear some deformation of the conduit, but after a 
long service time, the elastomer is easy to be degenerated and hardened, 
and led up to make an appearance of ageing fissure even to break up as the 
internal pressure getting enough high or a slight distortion happened. 
OBJECTS AND SUMMARY OF THE INVENTION 
It is therefore an object of this invention to provide a flexible extension 
conduit that not only support the length changing of the conduit, but also 
bear a higher flexibility even to work as flexible elbow. 
The basic unit of present invention includes a joint base, two joints, two 
ball valves, a sliding pipe, two dirt covers, a flat pipe, two damping 
collars and two embedded retainers, and so on. Therein the embedded 
retainer placed in the ball valve grasps the sliding pipe on, and a thrust 
collar is welded on the small end of the sliding pipe to prevent the 
sliding pipe from sliding off from the ball valve, then the valve holding 
the sliding pipe is located in the joint base co-operating with the 
damping collar and the joint so that the ball valve can turn a certain 
angle and the sliding pipe can slide in or out at a certain range as the 
earth crust motion or the change of the temperature occured. In the same 
way, a flat pipe is located in the spherical bearing of the sliding pipe.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
Referring to FIG. 1, the basic unit of the present invention includes a 
joint base 1, two joints 2, two ball valves 3, a sliding pipe 4, two dirt 
covers 5, a flat pipe 6, two damping collars 7 and two embedded retainers 
8. 
The joint base 1 is a hollow tubular base having a spherical housing 11 at 
one side and a ring flange 12 with several holes 121 at the mouth of the 
spherical housing 11. 
The joint 2 works as a cover of the joint base 1, corresponding to the 
joint base 1. There are a spherical housing and a ring flange 21 at one 
end and a ring groove 22 near the other end. 
The ball valve 3 is a ball spool with a canal crossing the comer, and there 
is a circular stopper 31 formed in the canal, by the circular stopper 31 
there is a caulking groove 33 with a catching rim 32 at the topside. 
The sliding pipe 4 consists of a flat tube portion 41 and a spherical 
bearing 42 with a ring flange 43 at edge, and several holes 431 formed on 
the flange 43. 
The dirt cover 5 made of elastic rubber material has a center crossing 
hole, and a caulking collar 51 extending from the inside edge at one end. 
The flat pipe 6 is an extending flat pipe with a ring flange at one end, 
and there is a thrust collar 61 will be weld nearing the other end. 
The damping collar 7 is made of colloid waterproof material, and there are 
several fins 71 formed at inside. 
The embedded retainer 8 is a colloid collar, and has a caulking groove 81 
formed at the topside. 
In combining, the embedded retainer 8 is placed in the caulking groove 33 
of the ball valve 3 so that the caulking groove 81 of the embedded 
retainer 8 catches the catching rim 32 in the caulking groove 33. Then, 
putting the dirt cover 5, the joint 2, a ring 9 and the ball valve 3 with 
the embedded retainer 8 on the sliding pipe 4 from the flat tube portion 
41 sequentially, and welding a thrust collar 44 on the end of the flat 
tube portion 41 to prevent the sliding pipe from sliding off from the ball 
valve 3 and to keep a segment from the ball valve 3 for the sliding pipe 4 
moving, and covering the dirt cover 5 on the joint 2 by setting the 
caulking collar 51 on the ring groove 22, next the damping ring 9 is put 
on the ball valve 3 by the fins 71 grasping the outer surface of the ball 
valve 3. Finally, bolting the ring flanges 12 21 on to fix the joint base 
1 and the joint 2 together so as to press the damping collar 7 to deform 
to seal the gap between the joint base 1 and the joint 2 working as a 
sealing ring. In the same way, co-operating with an embedded retainer 8, a 
ball valve 3 and a damping collar 7 and so on, the flat pipe 6 is located 
in the spherical bearing 42 of the sliding pipe 4. In this procedure, a 
thrust collar 61 is welded on the outside nearing the flat end to prevent 
the flat pipe 6 from sliding off from the ball valve 3. 
If used in a place with a bigger extension and flexibility, referring to 
FIG. 2, the number of the sliding pipes 4 can be increased properly to 
elongate the length of the flexible extension conduit so as to suit the 
requirement of variety situations. 
In practising as laying underground, referring to FIG. 3, the embedded 
retainer 8, the ring 9 and the damping collar 7 of the present invention 
can provide triple efficient sealing in any temperature to prevent the 
object in the conduit from leaking. When the temperature increases or 
decreases over a certain value, many basic units of the present invention 
can provide an extension space which is large enough so that the sliding 
pipes 4 can not slide off from the ball valves 3 to improve the safety of 
the conduit. 
Additionally, if the earth crust moving, referring to FIG. 4, the sliding 
pipes 4 can pivot an angle on the ball valves 3 respectively. In this 
case, the embedded retainer 8 and the dirt cover 5 are pivoted according 
to the ball valve 3 and the sliding pipe 4 together so that the sealing 
efficacy does not change.