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A lock structure. The lock structure includes a first element, a second element, a guiding element and a fixing pin. The first element has a guide hole and a first through hole located under the guide hole. The second element is deposed under the first element and has a second through hole that is c

A lock structure. The lock structure includes a first element, a second element, a guiding element and a fixing pin. The first element has a guide hole and a first through hole located under the guide hole. The second element is deposed under the first element and has a second through hole that is co-axially aligned with the first through hole. The guiding element rotates and is movably disposed in the guide hole. The guiding element has a third through hole aligned with the first through hole. The fixing pin is inserted through the third through hole, guide hole, first through hole and second through hole and has a first retaining portion. The first retaining portion is formed on the lower portion of the fixing pin and located under the second element.

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What is claimed is: 1. A lock structure, comprising: a first element having a guide hole and a first through hole located co-axially with the guide hole; a second element disposed under the first element and having a second through hole aligned with the first through hole; a guiding element rotatab

What is claimed is: 1. A lock structure, comprising: a first element having a guide hole and a first through hole located co-axially with the guide hole; a second element disposed under the first element and having a second through hole aligned with the first through hole; a guiding element rotatably and movably disposed in the guide hole, wherein the guiding element has a third through hole aligned with the first through hole; and a fixing pin inserted through the third through hole, the guide hole, the first through hole and the second through hole and having a first retaining portion, wherein the first retaining portion is formed on the lower portion of the fixing pin and located under the second element, cross sections of the first through hole, second through hole and third through hole are co-axially aligned with the cross section of the first retaining portion of the fixing pin, the first retaining portion pushes against the second element when the fixing pin rotates at an angle, and the cross sections of the first retaining portion, first through hole, second through hole, and third through hole are substantially rectangular. 2. The lock structure as claimed in claim 1, wherein the guide hole is circular and formed with inner threads. 3. The lock structure as claimed in claim 2, wherein the guiding element is a hollow cylinder, and the outer surface of the guiding element is formed with outer threads that engage the inner threads of the guide hole. 4. The lock structure as claimed in claim 1, wherein the guiding element further comprises at least one second retaining portion formed in the third through hole. 5. The lock structure as claimed in claim 4, wherein the fixing pin further comprises a third retaining portion formed on the upper portion of the fixing pin, and the second retaining portion abuts the third retaining portion. 6. The lock structure as claimed in claim 5, wherein a first groove is formed on the third retaining portion. 7. The lock structure as claimed in claim 1, wherein a second groove is formed on the guiding element. 8. The lock structure as claimed in claim 1, wherein the height of the guiding element is smaller than that of the guide hole. 9. A method for using a lock structure having a first element, a second element, a guiding element and a fixing pin, the first element having a guide hole and a first through hole located under the guide hole, the second element disposed under the first element and having a second through hole corresponding to the first through hole, the guiding element rotatably and movably disposed in the guide hole and having a third through hole corresponding to the first through hole, the fixing pin having a first retaining portion formed on the lower portion of the fixing pin, comprising the steps of: (a) rotating the guiding element to advance the guiding element into the guide hole; (b) fitting the fixing pin into the third through hole, guide hole, first through hole and second through hole to locate the first retaining portion thereof under the second element; (c) rotating the fixing pin by an angle in a first direction to rotate the first retaining portion thereof by the angle by inserting a tool in the first groove of the third retaining portion to turn the fixing pin; (d) rotating the guiding element to move the guiding element in the guide hole until the first retaining portion of the fixing pin abuts the second element; (e) rotating the guiding element to move the guiding element downward in the guide hole and separate the first retaining portion of the fixing pin from the second element; (f) rotating the fixing pin by an angle in a second direction opposite to the first direction to rotate the first retaining portion thereof by the angle; and (g) removing the fixing pin from the third through hole, guide hole, first through hole and second through hole to separate the first element from the second element; wherein the guiding element further comprises at least one second retaining portion formed in the third through hole; wherein the fixing pin further comprises a third retaining portion formed on the upper portion of the fixing pin, and the second retaining portion abuts the third retaining portion; and wherein a first groove is formed on the third retaining portion. 10. A method for using a lock structure having a first element, a second element, a guiding element and a fixing pin, the first element having a guide hole and a first through hole located under the guide hole, the second element disposed under the first element and having a second through hole corresponding to the first through hole, the guiding element rotatably and movably disposed in the guide hole and having a third through hole corresponding to the first through hole, the fixing pin having a first retaining portion formed on the lower portion of the fixing pin, comprising the steps of: (a) rotating the guiding element to advance the guiding element into the guide hole; (b) fitting the fixing pin into the third through hole, guide hole, first through hole and second through hole to locate the first retaining portion thereof under the second element; corresponding to the first through hole, the fixing pin having a first retaining portion formed on the lower portion of the fixing pin, comprising the steps of: (a) rotating the guiding element to advance the guiding element into the guide hole by inserting a tool in the second groove of the guiding element to turn the guiding element; (b) fitting the fixing pin into the third through hole, guide hole, first through hole and second through hole to locate the first retaining portion thereof under the second element; (c) rotating the fixing pin by an angle in a first direction to rotate the first retaining portion thereof by the angle; (d) rotating the guiding element to move the guiding element in the guide hole until the first retaining portion of the fixing pin abuts the second element; (e) rotating the guiding element to move the guiding element downward in the guide hole and separate the first retaining portion of the fixing pin from the second element; (f) rotating the fixing pin by an angle in a second direction opposite to the first direction to rotate the first retaining portion thereof by the angle; and (g) removing the fixing pin from the third through hole, guide hole, first through hole and second through hole to separate the first element from the second element; wherein a second groove is formed on the guiding element. 11. A method for using a lock structure having a first element, a second element, a guiding element and a fixing pin, the first element having a guide hole and a first through hole located under the guide hole, the second element disposed under the first element and having a second through hole corresponding to the first through hole, the guiding element rotatably and movably disposed in the guide hole and having a third through hole corresponding to the first through hole, the fixing pin having a first retaining portion formed on the lower portion of the fixing pin, comprising the steps of: (a) rotating the guiding element to advance the guiding element into the guide hole; (b) fitting the fixing pin into the third through hole, guide hole, first through hole and second through hole to locate the first retaining portion thereof under the second element; (c) rotating the fixing pin by an angle in a first direction to rotate the first retaining portion thereof by the angle; (d) rotating the guiding element to move the guiding element in the guide hole until the first retaining portion of the fixing pin abuts the second element by inserting a tool in the second groove of the guiding element to turn the guiding element; (e) rotating the guiding element to move the guiding element downward in the guide hole and separate the first retaining portion of the fixing pin from the second element; (f) rotating the fixing pin by an angle in a second direction opposite to the first direction to rotate the first retaining portion thereof by the angle; and (g) removing the fixing pin from the third through hole, guide hole, first through hole and second through hole to separate the first element from the second element; wherein a second groove is formed on the guiding element. 12. A method for using a lock structure having a first element, a second element, a guiding element and a fixing pin, the first element having a guide hole and a first through hole located under the guide hole, the second element disposed under the first element and having a second through hole corresponding to the first through hole, the guiding element rotatably and movably disposed in the guide hole and having a third through hole (c) rotating the fixing pin by an angle in a first direction to rotate the first retaining portion thereof by the angle; (d) rotating the guiding element to move the guiding element in the guide hole until the first retaining portion of the fixing pin abuts the second element; (e) rotating the guiding element to move the guiding element downward in the guide hole and separate the first retaining portion of the fixing pin from the second element; (f) rotating the fixing pin by an angle in a second direction opposite to the first direction to rotate the first retaining portion thereof by the angle by inserting a tool in the first groove of the third retaining portion to turn the fixing pin; and (g) removing the fixing pin from the third through hole, guide hole, first through hole and second through hole to separate the first element from the second element; wherein the guiding element further comprises at least one second retaining portion formed in the third through hole; wherein the fixing pin further comprises a third retaining portion formed on the upper portion of the fixing pin, and the second retaining portion abuts the third retaining portion; and wherein a first groove is formed on the third retaining portion. 13. A method for using a lock structure having a first element, a second element, a guiding element and a fixing pin, the first element having a guide hole and a first through hole located under the guide hole, the second element disposed under the first element and having a second through hole corresponding to the first through hole, the guiding element rotatably and movably disposed in the guide hole and having a third through hole corresponding to the first through hole, the fixing pin having a first retaining portion formed on the lower portion of the fixing pin, comprising the steps of: (a) rotating the guiding element to advance the guiding element into the guide hole; (b) fitting the fixing pin into the third through hole, guide hole, first through hole and second through hole to locate the first retaining portion thereof under the second element; (c) rotating the fixing pin by an angle in a first direction to rotate the first retaining portion thereof by the angle; (d) rotating the guiding element to move the guiding element in the guide hole until the first retaining portion of the fixing pin abuts the second element; (e) rotating the guiding element to move the guiding element downward in the guide hole and separate the first retaining portion of the fixing pin from the second element by inserting a tool in the second groove of the guiding element to turn the guiding element; (f) rotating the fixing pin by an angle in a second direction opposite to the first direction to rotate the first retaining portion thereof by the angle; and (g) removing the fixing pin from the third through hole, guide hole, first through hole and second through hole to separate the first element from the second element; wherein a second groove is formed on the guiding element.