Protecting device and stretchable member thereof

Abstract

A protecting device for placing an object includes two connecting members and two stretchable members. The two stretchable members are attached between the two connecting members to enclose an accommodating space. Each of the stretchable members includes a first block, a second block and two joint units. The first block includes a first linking part. The second block includes a recess portion located between two second linking parts. The two first ends of the joint unit are attached with each other and attached to the first linking part. The two second ends of the joint unit are separated with each other and attached to the second linking parts, respectively. When the stretchable members are at the retracted state, part of the joint unit is located inside the recess portion, and the joint unit is located outside the recess portion at the extended state.

What is claimed is: 
     
         1 . A protecting device for placing an object, comprising:
 two connecting members; and   two stretchable members each attached between the two connecting members, the two stretchable members and the two connecting members enclosing together to form an accommodating space which is for placing the object, each of the stretchable members having a retracted state and a extended state, and each of the stretchable members comprising:   a first block comprising a first linking part;   a second block comprising two second linking parts separated with each other, and a first recess portion located between the two second linking parts; and   two first join units each comprising a first end and a second end that are opposite to each other, the two first ends attached with each other and attached to the first linking part, the two second ends separated with each other and attached to the two second linking parts respectively, twice a length between the first end and the second end of each first join unit being longer than a straight-line between the two second linking parts;   wherein, when the stretchable members are at the retracted state, at least part of each of the first joint unit is located inside the first recess portion, and when the stretchable members are at the extended state, each of the first joint unit is located outside the first recess portion.   
     
     
         2 . The protecting device of  claim 1 , wherein the first block, the second block and the two first join unit are segmented from a main block, the main block has two side surfaces that are opposite to each other, two first cutting surfaces, two second cutting surfaces, two third cutting surfaces and two fourth cutting surfaces, the first join units are formed by each of the first cutting surface, each of the second cutting surface, each of the third cutting surfaces and each of the fourth cutting surfaces, wherein each of the first cutting surfaces and each of the fourth cutting surfaces extend from the side surfaces of the main block toward an interior of the main block, each of the second cutting surfaces and each of the third cutting surfaces keep a distance from the side surfaces of the main block, the third cutting surfaces connect with the first ends respectively, the fourth cutting surfaces connect with the second ends respectively, wherein when the stretchable members are at the retracted state, the first joint units and the first blocks are divided by the first cutting surfaces respectively, the fourth cutting surfaces and the first cutting surfaces connect with each other respectively, the first joint units and the second block are divided by the third cutting surfaces respectively, the two third cutting surfaces are connected with each other, and the second cutting surfaces connect with the third cutting surfaces respectively. 
     
     
         3 . The protecting device of  claim 2 , wherein each of the first join units has a first angle formed by a connection of each of the second cutting surfaces and each of the third cutting surfaces respectively, the first angle is greater than or equal to 90 degrees and less than 150 degrees, each of the first join units has a second angle formed by a connection of each of the first cutting surfaces and each of the fourth cutting surfaces, the second angle is greater than or equal to 90 degrees and less than 150 degrees, wherein when the stretchable members are at the retracted state, the first cutting surfaces are paralleled to the second cutting surfaces, the third cutting surfaces are paralleled to the fourth cutting surfaces. 
     
     
         4 . The protecting device of  claim 2 , wherein a width between the two side surfaces of the main block is X, when the stretchable members are at the retracted state, a distance between a connecting position of each of the first cutting surfaces and each of the side surfaces and a connecting position of each of the fourth cutting surfaces and each of the side surfaces is Y, a length of each of the first cutting surfaces is Z, a distance between each of the first cutting surfaces and each of the second cutting surfaces is M, a length of each of the second cutting surfaces is N, a length of each of the third cutting surfaces is P, a length of each of the fourth cutting surfaces is Q, a distance between each of an end of the second cutting surfaces and each of the fourth cutting surfaces is R, when the stretchable members are at the extended state, a distance between a connecting position of each of the first cutting surfaces and each of the side surfaces and a connecting position of each of the fourth cutting surfaces and each of the side surfaces is T, and the protecting device satisfies the following conditions:
     X/ 2 <Z< 2 X/ 3;       Q=Z/ 2;       P=Q/ 2;       Z/ 2 <N< 2 Z/ 3;       M=Q/ 2;       Y<X/ 2;       R=Z−N ; and       T= 3 Y/ 2.   
     
     
         5 . The protecting device of  claim 1 , further comprising two covering members set on the two connecting members for covering the object. 
     
     
         6 . The protecting device of  claim 1 , wherein the second block further comprise two third linking parts that are opposite to the two second linking parts and separated with each other, and a second recess portion locates between the two third linking parts, each of the stretchable members further comprising:
 a third block comprising a fourth linking part; and   two second joint units each comprising a third end and a fourth end that are opposite to each other, the two third ends separated with each other and attached to the two third linking parts respectively, the two fourth ends attached with each other and attached to the fourth linking parts, twice a length between the third end and the fourth end of each second joint unit being longer than a straight-line distance between the two third linking parts;   wherein, when the stretchable members are at the retracted state, at least part of each of the second joint units is located inside the second recess portion, and when the stretchable members are at the extended state, each of the second joint units is located outside the second recess portion.   
     
     
         7 . A stretchable member having a refracted state and a extended state comprising:
 a first block comprising a first linking part;   a second block comprising two second linking parts separated with each other, and a recess portion locating between the two second linking parts; and   two join units each comprising a first end and a second end that are opposite to each other, the two first ends attached with each other and attached to the first linking part, the two second ends separated with each other and attached to the two second linking parts respectively, twice a length between the first end and the second end of each of the joint units being longer than a straight-line between the two second linking parts;   wherein, when the stretchable member is at the retracted state, at least part of each of the joint units is located inside the recess portion, and when the stretchable member is at the extended state, each of the joint units is located outside the recess portion.   
     
     
         8 . The stretchable member of  claim 7 , wherein the first block, the second block and the two join units are segmented from a main block, the main block has two side faces that are opposite to each other, two first cutting surfaces, two second cutting surfaces, two third cutting surfaces and two fourth cutting surfaces, the joint units are formed by each of the first cutting surfaces, each of the second cutting surfaces, each of the third cutting surfaces and each of the fourth cutting surfaces, wherein, each of the first cutting surfaces and each of the fourth cutting surfaces extend from the side surfaces of the main block toward an interior of the main block, each of the second cutting surfaces and each of the third cutting surfaces keep a distance from the side surfaces of the main block, the third cutting surfaces connect with the first ends respectively, the fourth cutting surfaces connect with the second ends respectively; wherein when the stretchable member is at the retracted state, the joint units and the first blocks are divided by the first cutting surface respectively, the fourth cutting surfaces and the first cutting surfaces connect with each other respectively, the joint units and the second blocks are divided by the second cutting surfaces and the third cutting surfaces respectively, the two third cutting surfaces are connected with each other, and the second cutting surfaces connect with the third cutting surfaces respectively. 
     
     
         9 . The stretchable member of  claim 8 , wherein each of the join units have a first angle formed by a connection of each of the second cutting surfaces and each of the third cutting surfaces, the first angle is greater than or equal to 90 degrees and less than 150 degrees, each of the join units have a second angle formed by the connection of each of the first cutting surfaces and each of the fourth cutting surfaces, the second angle is greater than or equal to 90 degrees and less than 150 degrees; wherein when the stretchable is at the retracted state, the first cutting surfaces are parallel to the second cutting surfaces, the third cutting surfaces are parallel to the fourth cutting surfaces. 
     
     
         10 . The stretchable member of  claim 8 , wherein a width between the two side surfaces of the main block is X; when the stretchable member is at the retracted state, a distance between a connecting position of each of the first cutting surfaces and each of the side surfaces and a connecting position of each of the fourth cutting surfaces and each of the side surfaces is Y, a length of each of the first cutting surfaces is Z, a distance between each of the first cutting surfaces and each of the second cutting surfaces is M, a length of each of the second cutting surfaces is N, a length of each of the third cutting surfaces is P, a length of each of the fourth cutting surfaces is Q, a distance between each of the end of the second cutting surfaces and each of the fourth cutting surfaces is R; when the stretchable member is at the extended state, a distance between a connecting position of each of the first cutting surfaces and each of the side surfaces and a connecting position of each of the fourth cutting surfaces and each of the side surfaces is T, and the stretchable member satisfies the following conditions:
     X/ 2 <Z< 2 X/ 3;       Q=Z/ 2;       P=Q/ 2;       Z/ 2 <N< 2 Z/ 3;       M=Q/ 2;       Y<X/ 2;       R=Z−N ; and       T= 3 Y/ 2.