Folding scooter

1. A scooter comprising:

a foldable frame;

a leg support connected to said frame;

a rear wheel assembly connected to said frame;

a head stock assembly comprising:

a tubular column having an upper end and a lower end;

a steering shaft having a first end and a second end, said steering shaft being rotatably journaled in said tubular column;

a handle bar connected to said first end of said steering shaft;

a front wheel assembly connected to said second end of said steering shaft;

a collar slidably mounted on said tubular column and connected to said frame;

a latching assembly connected to said collar and being selectively operable to lock said scooter in a first position wherein said frame is in a first unfolded position and said collar is in a first lower position on said tubular column, and a second position wherein said frame is in a second folded position and said collar is in a second upper position on said tubular column; and

said frame comprising a first strut assembly connected to said front wheel assembly, a second strut assembly connected to said rear wheel assembly, said first and second strut assemblies being pivotally connected to one another by a first pin joint, a third strut assembly connected to said collar, a fourth strut assembly connected to said second strut assembly, said third and fourth strut assemblies being pivotally connected to one another by a second pin joint.

2. The scooter of claim 1 , wherein said first strut assembly comprises a first set of parallel struts, said second strut assembly comprises a second set of parallel struts, said third strut assembly comprises a third set of parallel struts, and said fourth strut assembly comprises a fourth set of parallel struts.

3. The scooter of claim 1 , wherein said latching assembly comprises a spring biased pin extending through said collar, there being at least one hole in said tubular column for receiving said pin, said pin being releasably biased to extend into said at least one hole and thereby preventing said collar from sliding along said column.

4. The scooter of claim 1 , further comprising a crutch holder assembly.

5. The scooter of claim 4 , wherein said crutch holder assembly comprises an upper pair of grippers connected to said tubular column, and a lower pair of cups connected to said tubular column.

6. The scooter of claim 1 , wherein said front wheel assembly comprises:

a center linkage connected to said steering shaft;

a first tie rod connected one end to said center linkage and at another end to a first steering knuckle, said first steering knuckle connected to a first wheel;

a second tie rod connected at one end to said center linkage and at another end to a second steering knuckle, said second steering knuckle connected to a second wheel;

whereby turning of said steering shaft causes turning of said center linkage, movement of said first and second tie rods, turning of said first and second steering knuckles and turning of said first and second wheels.

7. The scooter of claim 6 , wherein said first and second wheels are tilted when said scooter is in said second folded position.

8. A scooter comprising:

a foldable frame;

a leg support connected to said frame;

a rear wheel assembly connected to said frame;

a head stock assembly comprising:

a tubular column having an upper end and a lower end;

a steering shaft having a first end and a second end, said steering shaft being rotatably journaled in said tubular column;

a handle bar connected to said first end of said steering shaft;

a front wheel assembly connected to said second end of said steering shaft;

a collar slidably mounted on said tubular column and connected to said frame;

a latching assembly connected to said collar and being selectively operable to lock said scooter in a first position wherein said frame is in a first unfolded position and said collar is in a first lower position on said tubular column, and a second position wherein said frame is in a second folded position and said collar is in a second upper position on said tubular column;

wherein said front wheel assembly comprises:

a center linkage connected to said steering shaft;

a first tie rod connected one end to said center linkage and at another end to a first steering knuckle, said first steering knuckle connected to a first wheel;

a second tie rod connected at one end to said center linkage and at another end to a second steering knuckle, said second steering knuckle connected to a second wheel;

whereby turning of said steering shaft causes turning of said center linkage, movement of said first and second tie rods, turning of said first and second steering knuckles and turning of said first and second wheels.

9. The scooter of claim 8 , wherein said latching assembly comprises a spring biased pin extending through said collar, there being at least one hole in said tubular column for receiving said pin, said pin being releasably biased to extend into said at least one hole and thereby preventing said collar from sliding along said column.

10. The scooter of claim 8 , further comprising a crutch holder assembly.

11. The scooter of claim 10 , wherein said crutch holder assembly comprises an upper pair of grippers connected to said tubular column, and a lower pair of cups connected to said tubular column.

12. The scooter of claim 8 , wherein said frame comprises a first strut assembly connected to said front wheel assembly, a second strut assembly connected to said rear wheel assembly, said first and second strut assemblies being pivotally connected to one another by a first pin joint, a third strut assembly connected to said collar, a fourth strut assembly connected to said second strut assembly, said third and fourth strut assemblies being pivotally connected to one another by a second pin joint.

13. The scooter of claim 12 , wherein said first strut assembly comprises a first set of parallel struts, said second strut assembly comprises a second set of parallel struts, said third strut assembly comprises a third set of parallel struts, and said fourth strut assembly comprises a fourth set of parallel struts.

14. The scooter of claim 8 , wherein said first and second wheels are tilted when said scooter is in said second folded position.

15. A scooter comprising:

a foldable frame;

a leg support connected to said frame;

a rear wheel assembly connected to said frame;

a head stock assembly comprising:

a tubular column having an upper end and a lower end;

a steering shaft having a first end and a second end, said steering shaft being rotatably journaled in said tubular column;

a handle bar connected to said first end of said steering shaft;

a front wheel assembly connected to said second end of said steering shaft;

a collar slidably mounted on said tubular column and connected to said frame;

a latching assembly connected to said collar and being selectively operable to lock said scooter in a first position wherein said frame is in a first unfolded position and said collar is in a first lower position on said tubular column, and a second position wherein said frame is in a second folded position and said collar is in a second upper position on said tubular column;

wherein said frame comprises a first strut assembly connected to said front wheel assembly, a second strut assembly connected to said rear wheel assembly, said first and second strut assemblies being pivotally connected to one another by a first pin joint, a third strut assembly connected to said collar, a fourth strut assembly connected to said second strut assembly, said third and fourth strut assemblies being pivotally connected to one another by a second pin joint;

wherein said front wheel assembly comprises:

a center linkage connected to said steering shaft;

a first tie rod connected one end to said center linkage and at another end to a first steering knuckle, said first steering knuckle connected to a first wheel;

a second tie rod connected at one end to said center linkage and at another end to a second steering knuckle, said second steering knuckle connected to a second wheel;

whereby turning of said steering shaft causes turning of said center linkage, movement of said first and second tie rods, turning of said first and second steering knuckles and turning of said first and second wheels.

16. The scooter of claim 15 , wherein said first strut assembly comprises a first set of parallel struts, said second strut assembly comprises a second set of parallel struts, said third strut assembly comprises a third set of parallel struts, and said fourth strut assembly comprises a fourth set of parallel struts.

17. The scooter of claim 15 , wherein said latching assembly comprises a spring biased pin extending through said collar, there being at least one hole in said tubular column for receiving said pin, said pin being releasably biased to extend into said at least one hole and thereby preventing said collar from sliding along said column.

18. The scooter of claim 15 , wherein said first and second wheels are tilted when said scooter is in said second folded position.

19. The scooter of claim 15 , further comprising a crutch holder assembly.

20. The scooter of claim 19 , wherein said crutch holder assembly comprises an upper pair of grippers connected to said tubular column, and a lower pair of cups connected to said tubular column.