Lamp casing mechanism

1. A lamp casing mechanism, comprising:

a lamp arm holder, comprising a pivoted axle, wherein the pivoted axle comprises a first fixing hole extending in a first direction and a second fixing hole extending in a second direction;

a lamp cover, comprising a first accommodation trough, wherein the pivoted axle is located in the first accommodation trough; and

a fixing member, comprising a fixing portion, wherein the fixing portion is detachably fixed to one of the first and the second fixing holes of the pivoted axle.

2. The lamp casing mechanism as recited in claim 1 , wherein the lamp cover further comprises a through groove having an extension length and communicating with the first accommodation trough, the fixing member passes through the through groove and is configured to move along the extension length of the through groove, so that the lamp cover is adapted to move relative to the lamp arm holder.

3. The lamp casing mechanism as recited in claim 2 , further comprising:

a cushion block, located in the first accommodation trough, the cushion block comprises a through hole, wherein the through hole corresponds to one of the first fixing hole and the second fixing hole of the pivoted axle.

4. The lamp casing mechanism as recited in claim 3 , wherein the fixing member further comprises a pressing portion and a connecting portion located between the fixing portion and the pressing portion, the connecting portion penetrates through the through hole of the cushion block, and the pressing portion presses against the lamp cover.

5. The lamp casing mechanism as recited in claim 4 , wherein the lamp cover further comprises a second accommodation trough recessed on an outer surface, and the pressing portion is located in the second accommodation trough.

6. The lamp casing mechanism as recited in claim 3 , wherein the through hole of the cushion block comprises a first segment and a second segment, an inner diameter of the first segment is greater than an outer diameter of the fixing portion, and the second segment has an inner diameter corresponding to the fixing portion.

7. The lamp casing mechanism as recited in claim 6 , wherein a length of the first segment is greater than or equal to a length of the fixing portion.

8. The lamp casing mechanism as recited in claim 3 , wherein the cushion block comprises an inner arc surface and an outer arc surface opposite each other, the inner arc surface contacts the pivoted axle, the outer arc surface contacts a wall surface of the lamp cover, the wall surface is beside the first accommodation trough, the through hole passes through the inner arc surface and the outer arc surface, the first segment of the through hole is close to the inner arc surface, and the second segment of the through hole is close to the outer arc surface.

9. The lamp casing mechanism as recited in claim 1 , further comprising:

a position-limiting member, located in and fixed to the lamp cover, wherein the position-limiting member presses against the pivoted axle.

10. The lamp casing mechanism as recited in claim 9 , wherein the position-limiting member comprises a body part, a fixing part, and a limiting part, the fixing part and the limiting part are respectively disposed at two ends of the body portion and are bent and extended in two opposite directions, the fixing part is fixed to the lamp cover, and the limiting part presses against the pivoted axle.

11. A lamp casing mechanism, comprising:

a lamp arm holder, comprising a pivoted axle, wherein the pivoted axle comprises a first fixing hole extending in a first direction;

a lamp cover, comprising a first accommodation trough and a through groove having an extension length and communicating with the first accommodation trough, wherein the pivoted axle is located in the first accommodation trough; and

a fixing member, comprising a fixing portion, wherein the fixing portion is detachably fixed to the first fixing hole of the pivoted axle, the fixing member passes through the through groove and is configured to move along the extension length of the through groove, so that the lamp cover is adapted to move relative to the lamp arm holder.

12. The lamp casing mechanism as recited in claim 11 , further comprising:

a cushion block, located in the first accommodation trough, the cushion block comprises a through hole, wherein the through hole corresponds to the first fixing hole of the pivoted axle and a part of the through groove, and the fixing member penetrates through the through hole of the cushion block.