Folding chair with safety folding device

1. A folding chair with safety folding device comprising a pair of front legs, a pair of rear legs, a front crossbar, a rear crossbar, a pivotal shaft, a back, a safety book, a pin, a torsion spring, a bottom cover, and a seat;

wherein the front crossbar is attached to a lower portion of the front legs;

wherein the rear crossbar is attached to a lower portion of the rear legs;

wherein the pivotal shaft connects one of the pair of front legs to a corresponding one of the pair of rear legs;

wherein the back is located at a top of the front legs;

wherein the safety hook is employed to position the pair of rear legs after the folding chair is unfolded, and when the folding chair is being folded, the pair of rear legs can be released safely by pressing the safety hook, thus preventing an undesired pinching injury as a result of improper operation or impact;

wherein the safety hook is a J-shaped unitary structure and is formed at a front end thereof with an arc retaining portion;

wherein a pivotal hole is formed at a mid portion of the safety hook for insertion of the pin;

wherein a press board is formed at a rear portion of the safety hook to be pressed by a user;

wherein the pin is a cylinder to be inserted in the pivotal hole, and both ends of the pin are located in the bottom cover; and

wherein the torsion spring is mounted on the pin;

and wherein the bottom cover is a U-shaped piece mounted to a bottom of the seat and is formed at a front portion thereof with a slot, and both ends of the bottom cover are folded to form a flange connected to the bottom of the seat of the folding chair.

2. The folding chair with safety folding device as claimed in claim 1 , wherein the arc retaining portion is abutted by an upper lateral pipe connected between the pair of rear legs when the folding chair is being unfolded.

3. The folding chair with safety folding device as claimed in claim 1 , wherein the torsion spring serves to provide a positioning force for positioning the folding chair after the folding chair is unfolded.

4. The folding chair with safety folding device as claimed in claim 1 , wherein the front and rear legs of the folding chair serve to support the user together after the folding chair is unfolded.

5. The folding chair with safety folding device as claimed in claim 1 , wherein the back of the folding chair is located at a top of the front legs for backing the user.

6. The folding chair with safety folding device as claimed in claim 1 , wherein the front and rear legs are able to pivot about the pivotal shaft.

7. The folding chair with safety folding device as claimed in claim 4 , wherein the front legs serve to support a weight of a rear portion of the seat.

8. The folding chair with safety folding device as claimed in claim 4 , wherein the rear legs serve to support a weight of a front portion of the seat, and the upper lateral pipe connected between the pair of rear legs is received in a space between the seat and the bottom cover.