1. Field of the Invention
The present invention relates to a tricycle crank structure, in particular to a crank structure that is capable of a quick release.
2. Description of the Related Prior Art
A conventional tricycle crank structure has the crank directly mounted to a front wheel with pedals thereon for a toddler to ride. However, before the toddler learns how to ride the pedals, he/she usually pushes the tricycle with his/her feet on the ground to move. During the time, the crank will keep turning the pedals, which may hit the toddler's feet. Thus a design was derived to make the tricycle without cranks and pedals.
After couple weeks, when the toddler is ready to ride the tricycle, the tricycle has to be modified to mount the crank and pedal back to its wheel. This increases the cost of the tricycle and is also complicated.
It is the primary object of the present invention to provide a tricycle crank structure, which makes changing cranks and pedals as an easy job.
It is another object of the present invention to provide a tricycle crank structure, which is safe for a toddler to ride.
It is a further object of the present invention to provide a tricycle crank structure, which is less expensive in manufacture and is easy to replace parts.
As shown in
The wheel axle 1 is pivotally connected to a pair of bearing bases of a front tube. The wheel axle 1 is provided with a pair of non-circular sectional hole 11 at respective ends. The inner wall of each hole 11 is provided with a recess 12.
Each crank 2 has one end pivotally connected to the pedal 3 and another end provided with a connecting section 21. The connecting section 21 has a tenon 211 thereon.
The connecting section 21 of the crank 2 is engaged with the hole 11 of the wheel axle 1, as shown in
By pulling the crank 2 with the pedal 3 outwardly from the wheel axle 1, as shown in
As shown in
The wheel axle 1A is provided with a pair of non-circular sectional holes 11A at respective ends. Each hole 11A is formed with a pair of through holes 12A.
Each crank 2A has one end pivotally connected to the pedal 3A and another end provided with a connecting section 21A. The connecting section 21A is provided with a pair of through holes 211A for an elastic clip 22A to protrude therefrom.
Thus, by inserting the connecting section 21A of the crank 2A into the hole 11A of the wheel axle 1A, the elastic clip 22A protrudes from the through holes 12A to secure thereat.
To dismount the present invention, the elastic clip 22A is released from the through holes 12A, the connecting section 21A of the crank 2A may be pulled away from the hole 11A of the wheel axle 1A.
Number | Name | Date | Kind |
---|---|---|---|
3648542 | Perotti et al. | Mar 1972 | A |
4171822 | Thun | Oct 1979 | A |
5273300 | Wells | Dec 1993 | A |
5934155 | Lai | Aug 1999 | A |
6708998 | Blake | Mar 2004 | B1 |
20030080528 | Damon et al. | May 2003 | A1 |
Number | Date | Country | |
---|---|---|---|
20070052197 A1 | Mar 2007 | US |