Lock apparatus

1. A lock apparatus for attaching a container member to a support member openably, the lock apparatus comprising:

an operation handle;

a spring, which is movably supported by the container member;

a slide pin, which is urged in a direction of a lock hole defined on the support member by the spring, respectively; and

a cam member to which a rear end portion of the slide pin is attached to urge the slide pin to project and retract, and

wherein when the operation handle is operated in a swing manner, a front end portion of the slide pin is retracted from the lock hole of the support member against pressure of the spring, and

wherein a cylinder that accommodates the cam member is formed on the operation handle.

2. The lock apparatus according to claim 1 , wherein the spring is accommodated within the cylinder.

3. The lock apparatus according to claim 1 , further comprising a support frame that supports the operation handle,

wherein the operation handle supports the spring and the cam member.

4. The lock apparatus according to claim 1 , further comprising a support frame that include a screw hole on a rear surface side thereof and that includes bent walls bent to extend in a direction towards the cylinder at both side edges thereof,

wherein each of the bent walls includes an opening that allows a front end of the cam member to go therethrough.

5. The lock apparatus according to claim 4 , wherein the cam member is supported by the opening so that the front end is not rotatable but can go through the opening.

6. the lock apparatus according to claim 1 , wherein the cylinder includes a projection on an inner face thereof, and

wherein the cam member includes a cam groove having a guide portion for guiding the projection into the cam groove.

7. The lock apparatus according to claim 1 , wherein the cylinder includes a pair of projections on an inner face thereof, the pair of projections being opposed to each other, and

wherein the cam member includes a pair of cam grooves each including a guide portion for guiding the one of the projections thereinto.

8. The lock apparatus according to claim 1 , wherein the cam member includes a cam groove having a lock portion for locking the cam member at a position that the cam member is retracted in the cylinder.

9. The lock apparatus according to claim 8 , wherein said lock portion comprises a substantially flat surface shape perpendicular to a direction of movement of the cam member.

10. The lock apparatus according to claim 1 , further comprising an O-ring which slide contacts with the cylinder and a cylindrical portion of the cam member simultaneously.

11. The lock apparatus according to claim 1 , wherein said slide pin comprises an end portion, said end portion comprising:

a bifurcated structure comprising elastic pieces.

12. The lock apparatus according to claim 1 , wherein the cylinder slidably supports the cam member.

13. The lock apparatus according to claim 1 , wherein the cylinder comprises a pair of projected portions on an inner face thereof, the pair of projected portions being opposed to each other such that a first of said pair of projected portions is formed on an upper portion of the inner face and a second of said pair of projected portions is formed on a lower portion of the inner face, and

wherein the cam member includes a pair of cam grooves each including a guide portion for guiding the one of the projected portions thereinto.

14. The lock apparatus according to claim 1 , wherein the cylinder comprises a pair of projected portions on an inner face thereof, the pair of projected portions being disposed opposed to each other with respect to a center of said cylinder, and

wherein the cam member includes a pair of cam grooves each including a guide portion for guiding the one of the projected portions thereinto.

15. The lock apparatus according to claim 1 , wherein said cam member is substantially entirely contained within said cylinder.

16. The lock apparatus according to claim 1 , wherein said slide pin comprises an end portion, said end portion comprising:

a generally U-shaped extension portion extending from said end portion, said generally U-shaped extension portion comprising a through hole for engaging a contact piece disposed on said cam member.

17. The lock apparatus according to claim 16 , wherein said generally U-shaped extension portion comprises a pair of projections, said projects engaging a pair of holes in said cam member.

18. The lock apparatus according to claim 1 , wherein said slide pin includes an extension portion extending from an end of said slide pin,

wherein said cam member includes a generally square tubular portion, and

wherein said extension portion of said slide pin is inserted into said generally square tubular portion.

19. The lock apparatus according to claim 18 , wherein said slide pin further includes a pair of projections disposed on said extension portion.

20. The lock apparatus according to claim 1 , wherein the cam member and the cylinder are configured to rotate relatively opposed to one another.

21. A method of assembling a lock apparatus for attaching a container member to a support member openably, the method comprising:

providing the lock apparatus, the lock apparatus comprising:

an operation handle;

a spring, which is movably supported by the container member; and

a cam member; and

inserting a slide pin into the cam member, the slide pin being urged in a direction of a lock hole defined on the support member by the spring,

wherein a rear end portion of the slide pin is attached to the cam member to urge the slide pin to project and retract,

wherein when the operation handle is operated in a swing manner, a front end portion of the slide pin is retracted from the lock hole of the support member against pressure of the spring, and

wherein a cylinder that accommodates the cam member is formed on the operation handle.

22. A lock apparatus for attaching a container member to a support member openably, the lock apparatus comprising:

an operation handle;

a pair of springs, which are movably supported by the container member;

a pair of slide pins, which are urged in a direction of a lock hole defined on the support member by the springs, respectively; and

a pair of cam members to which a rear end portion of the slide pins is attached to urge the slide pins to project and retract, and

wherein when the operation handle is operated in a swing manner, a front end portion of the slide pins is retracted from the lock hole of the support member against pressure of the springs, and

wherein a cylinder that accommodates the cam members is formed on the operation handle.