Patent Application
20080061534
Referring to
An X-shaped folding device 2 is connected between the front and rear wheel frames 11. The X-shaped folding device 2 includes a pair of front rods 21 and each front rod 21 has a first end pivotably connected with the front wheel frame 11. Two respective second ends of the front rods 21 are pivotably connected to two respective first ends of a pair of rear rods 22. Two respective second ends of the rear rods 22 are pivotably connected with the rear wheel frame 12. A first connection piece 211 is connected to the two respective second ends of the two front rods 21 and a second connection piece 221 is connected to the two respective first ends of the two rear rods 22. The first and second connection pieces 211, 221 are pivotably connected with each other by a pin 222. A pivotable member 24 is connected on a top of a pivotal point of the two first ends of the rear rods 22.
A link device 20 is connected to the pivotable member 24 and includes a main part 25, a first part 26, a second part 27, a pair of links 28 and a handle 23. The main part 25 has a first end pivotably connected to the pivotable member 24 of the rear rods 22 by a rive 241. The handle 23 is pivotably connected to a second end of the main part 25. A front end of the first part 26 is pivotably connected to the front rods 21 by a bar 261 and a second end of the first part 26 is pivotably connected to a mediate portion of the main part 25 by a rivet 251. Two boxes 212 are respectively connected to the two respective second ends of the front rods 21 and a passage 213 is defined through each of the boxes 212. The first end of the first part 26 is pivotably connected between the two boxes 212 by extending the bar 261 through the passage 213 and connected to the two boxes 212.
A first end of the second part 27 has two bosses 271 on two sides thereof and the two bosses 271 are movably engaged with one of a first hole 252 and a second hole 253 defined in the mediate portion of the main part 25. A U-shaped member 272 is pivotably connected to a second end of the second part 27 by a rivet 273. The two links 28 has two respective first ends pivotably connected with each other and two respective second ends of the two links 28 are pivotably connected to the two rear rods 22. A torsion spring 29 is connected between the U-shaped member 272 and one of the two links 28. The torsion spring 29 has two legs 291 which extend through two respective apertures 281 defined through the two links 28,
As shown in
When unfolding the baby stroller 10, the handle 23 is pushed downward, the first holes 252 are disengaged from the bosses 271, and the handle 23 is continuously pushed downward to press the main part 25 which activates the first and second parts 26, 27 to expand the front rods 21 and the rear rods 22. The front wheel frame 11 and the rear wheel frame 12 are then expanded. The main part 25 is pressed to its another extreme position to allow the front and rear rods 21, 22 to expand as an X-shape. The second holes 253 are again engaged with the bosses 271 so that the main part 25 and the second part 27 are secured so that the folding device 2 is not folded.
The torsion spring 29 provide an reaction force to the second part 27 so that when the main part 25 is pressed, the torsion spring 29 provides a space to allow the front and rear rods 21, 22 to be expanded to an X-shaped structure.
The folding device 2 can be folded by lifting the link device 20 and the X-shaped folding device 2 is locked by the link device 20. The locking action is completed within one operation action.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
