Portable working machine

1. A portable working machine comprising:

a working machine body;

at least one bolt member erected on the working machine body;

a cover member configured to be attachable to and detachable from the working machine body, wherein the cover member has at least one through-hole through which the at least one bolt member is inserted when being attached to the working machine body;

at least one fixing member configured to be fastened to the at least one bolt member to fix the cover member attached to the working machine body; and

a holding member attached to an outer surface of the cover member, wherein the holding member includes at least one holding member through-hole through which the at least one fixing member passes that is configured to retain the at least one fixing member to the holding member when a fastening of the at least one fixing member to the corresponding bolt member is released to prevent the at least one fixing member from dropping off the holding member.

2. The portable working machine according to claim 1 , wherein

a predetermined gap space exists between the holding member and the outer surface of the cover member; and

the at least one fixing member comprises:

a fixing member body which has a nut portion formed with a female screw which corresponds to a male screw of the bolt member, and a cylindrical sleeve portion extending from the nut portion and accommodates a tip end portion of the at least one bolt member therein, and is configured to be fastened to the at least one bolt member; and

a washer member which is mounted on the sleeve portion of the fixing member body and is configured to be movable in an axial direction of the sleeve portion and to be prevented from dropping off the sleeve portion,

wherein the washer member is disposed in the predetermined gap space, and

wherein the holding member is configured to retain the fixing member by holding the washer member when the fastening of the nut portion of the fixing member body to the at least one bolt member is released.

3. The portable working machine according to claim 2 , wherein

the fixing member body is configured to be movable in a direction away from the working machine body by a movable amount of the washer member in the predetermined gap space after the fastening of the fixing member body to the at least one bolt member is released.

4. The portable working machine according to claim 3 , wherein

a movable amount of the fixing member body is obtained by adding the movable amount of the washer member in the predetermined gap space to a movable amount of the nut portion on the bolt member.

5. The portable working machine according to claim 4 ,

wherein the movable amount of the nut portion on the bolt member is greater than the movable amount of the washer member in the predetermined gap space.

6. The portable working machine according to claim 2 , wherein

the holding member is configured to cover a predetermined region of the outer surface of the cover member, which includes the at least one through-hole, and the at least one holding member through-hole corresponds to the at least one through-hole of the cover member, and

a diameter of the at least one holding member through-hole is greater than an outer diameter of the nut portion and smaller than an outer diameter of the washer member.

7. The portable working machine according to claim 6 , wherein

the predetermined region is formed as a recessed region having the at least one through-hole at a bottom thereof.

8. The portable working machine according to claim 1 , wherein

a predetermined gap space exists between the holding member and the outer surface of the cover member that accommodates a portion of the at least one fixing member and

the holding member is configured to cover a predetermined region of the outer surface of the cover member and form a gap between the holding member and the cover member on a lower side of the cover member, wherein the gap forms a passage from the gap space to the outer surface of the cover member.

9. The portable working machine according to claim 1 , wherein

the at least one bolt member is two bolt members, the at least one fixing member is two fixing members, the at least one through-hole is two through-holes, and the at least one holding member through-hole is two holding member through-holes.

10. The portable working machine according to claim 1 , further comprising

a functional component disposed between the working machine body and the cover member, wherein

the at least one fixing member is configured to additionally fix the functional component to the working machine body by being fastened to the at least one bolt member.

11. The portable working machine according to claim 10 , wherein

the portable working machine is a chain saw, the functional component is a guide bar guiding a saw chain, and the cover member is configured to cover at least a rear side of the guide bar.

12. The portable working machine according to claim 1 ,

wherein a predetermined gap space exists between the holding member and the outer surface of the cover member that accommodates a portion of the at least one fixing member; and the holding member is configured to retain the at least one fixing member when the fastening of the at least one fixing member to the at least one bolt member is released in such a manner that the at least one fixing member is relatively movable, via the gap space, in a predetermined range in an axial direction of the at least one bolt member with respect to the cover member and the holding member.

13. The portable working machine according to claim 1 , wherein

the cover member, the at least one fixing member, and the holding member are integrated with each other to form a cover assembly which is configured to be attachable to and detachable from the working machine body.

14. A portable working machine comprising:

a working machine body;

at least one bolt member erected on the working machine body;

a cover member configured to be attachable to and detachable from the working machine body, wherein the cover member has at least one through-hole through which the at least one bolt member is inserted when being attached to the working machine body;

at least one fixing member comprising a fixing member body which has a nut portion formed with a female screw which corresponds to a male screw of the at least one bolt member, and a cylindrical sleeve portion extending from the nut portion and accommodates a tip end of the at least one bolt member therein, and is configured to be fastened to the at least one bolt member to fix the cover member attached to the working machine body; and a washer member which is mounted on the sleeve portion of the fixing member body and is configured to be movable in an axial direction of the sleeve portion and to be prevented from dropping off the sleeve portion; and

a holding member attached to an outer surface of the cover member with a predetermined gap space between the holding member and the outer surface of the cover member, wherein the holding member, which includes at least one holding member through-hole through which the at least one fixing member passes so that the washer member is disposed in the predetermined gap space, is configured to retain the fixing member by holding the washer member on an outer side of the outer surface of the cover member when fastening of the nut portion of the fixing member body to the at least one bolt member is released to prevent that at least one fixing member from dropping off the cover member.