Bearings for the vibration-causing assembly of a vibrating screed

1. A vibrating device for surfacing concrete, said vibrating device comprising:

a surfacing blade;

a vibration-causing assembly in communication with said surfacing blade, said vibration-causing assembly comprising:

a counterweight body comprising an upper end and a lower end;

a substantially vertically extending shaft assembly comprising an upper end and a lower end, wherein the shaft assembly is disposed within the counterweight body such that the lower end of the shaft assembly is proximal to the lower end of the counterweight body; and

a double bearing assembly in communication with said shaft assembly; and

an actuator in communication with said vibration-causing assembly, so as to cause said vibration-causing assembly to impart a vibratory motion to said blade;

wherein said double bearing assembly comprises a first bearing disposed between the shaft assembly and the upper end of the counterweight body and a second bearing disposed between the shaft assembly and the lower end of the counterweight body; and

wherein said double bearing-assembly provides for substantially avoiding undesired oscillating movement of said blade during said vibratory motion to achieve smooth surfacing of the concrete.

2. A vibrating device according to claim 1 , wherein said first bearing is mounted between two shoulder structures formed at one end of said shaft assembly and said second bearing is mounted between another two shoulder structures formed at an opposite end of said shaft assembly.

3. A vibrating device according to claim 1 , wherein said actuator comprises a motor in communication with a transmission connecting said motor to said vibration-causing assembly.

4. A vibrating device according to claim 3 , wherein said transmission comprises an axle in communication at one end thereof to said motor and in communication at an opposite end thereof to said shaft assembly.

5. A vibrating device according to claim 4 , wherein said axle is in communication with said motor via a drive shaft.

6. A vibrating device according to claim 4 , wherein said axle comprises a resilient flexible axle.

7. A vibrating device according to claim 1 , wherein said counterweight body is in communication with said blade.

8. A vibrating device according to claim 7 , wherein said counterweight body defines a housing enclosure for housing said shaft assembly therein.

9. A vibrating device according to claim 1 , further comprising a steering assembly in communication with said blade.

10. A vibrating device according to claim 9 , wherein said steering assembly comprises a handle assembly, said handle assembly comprising at least one arm in communication with said blade, said arm being so adjustable as to vary the length thereof.

11. A vibrating device according to claim 10 , wherein said at least one arm comprises telescoping portions, said telescoping portions being moveable relative to each other so as to vary the length of said arm.

12. A vibrating device according to claim 10 , wherein said handle assembly comprises two said arms.

13. A vibrating device according to claim 10 , wherein said at least two arms comprises one end in communication with said blade and an opposite free end comprising a handle.

14. A vibrating device according to claim 12 , wherein said handle comprises a controller linked to said actuator for control thereof.

15. A vibrating device according to claim 13 , wherein said one end opposite is connected to a vibration-resistance member in communication with said blade and providing to substantially avoid said vibratory motion from being transmitted to said arm.

16. A vibrating device according to claim 15 , wherein said vibration-resistance member is in communication with said vibration-causing assembly.

17. A vibrating device according to claim 1 , further comprising a seal member for sealing a junction between said actuator and said vibration-causing assembly.

18. A vibrating device according to claim 17 , wherein said actuator is in communication with said vibration-causing assembly via a transmission, said seal member mounted about said transmission.

19. A vibrating device according to claim 18 wherein said transmission comprises an axle.

20. A vibrating device according to claim 19 , wherein said axle comprises a flexible axle.

21. A vibrating device according to claim 17 , wherein said seal member is mounted between two opposite plate portions of a plate member.

22. A vibrating device according to claim 21 , wherein said plate member is in communication with said vibration-causing assembly.

23. A vibrating device according to claim 22 , wherein said counterweight body is connected to a vibrating member being connected to said blade.

24. A vibrating device according to claim 21 , wherein said plate member is in communication with said steering assembly.