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A retractable snap ring structure includes a snapping hook, a clamping seat, a receiving box, a bottom housing, a fixing plate, an upper washer, a lower washer, a vehicle body, a spring, and a small-sized spring. The hook portion of the snapping hook may be protruded outward from or retracted into t

A retractable snap ring structure includes a snapping hook, a clamping seat, a receiving box, a bottom housing, a fixing plate, an upper washer, a lower washer, a vehicle body, a spring, and a small-sized spring. The hook portion of the snapping hook may be protruded outward from or retracted into the vehicle body by a simple pressing action, thereby facilitating the user using the retractable snap ring structure. Thus, when the snapping hook is not in use, the hook portion of the snapping hook may be retracted and hidden in the vehicle body, thereby preventing the hook portion of the snapping hook from protruding outward to hurt the people, and thereby increasing the lifetime of the snap ring structure.

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1. A retractable snap ring structure, comprising a snapping hook, a clamping seat, a receiving box, a bottom housing, a fixing plate, an upper washer, a lower washer, a vehicle body, a spring, and a small-sized spring, wherein: the snapping hook is integrally formed with a hollow hook portion, th

1. A retractable snap ring structure, comprising a snapping hook, a clamping seat, a receiving box, a bottom housing, a fixing plate, an upper washer, a lower washer, a vehicle body, a spring, and a small-sized spring, wherein: the snapping hook is integrally formed with a hollow hook portion, the hook portion of the snapping hook has a bottom provided with a stop portion, the stop portion of the snapping hook has a bottom face integrally formed with a locking portion which extends downward; the clamping seat has a top portion provided with two opposite serrated locking blocks; the receiving box is formed with two rectangular locking slots; the bottom housing has an opened top portion provided with two opposite wing-shaped lugs each formed with a screw bore; the fixing plate is formed with an oblong slot, and two opposite circular through holes each located beside the oblong slot; the upper washer is formed with an oblong slot, and two circular opposite through holes each located beside the oblong slot; the lower washer is formed with an oblong slot, and two circular opposite through holes each located beside the oblong slot; the vehicle body is formed with an oblong slot, and two circular opposite through holes each located beside the oblong slot; the spring has a first end secured on the locking portion of the snapping hook, and a second end secured on the locking blocks of the clamping seat; the clamping seat and the small-sized spring are pivotally mounted in the two rectangular locking slots of the receiving box which is received in the bottom housing; the stop portion of the snapping hook is mounted on the opened top portion of the bottom housing; and the hook portion of the snapping hook is in turn extended through the oblong slot of the lower washer, the oblong slot of the vehicle body, the oblong slot of the upper washer and the oblong slot of the fixing plate, and is protruded outward from the oblong slot of the fixing plate. 2. The retractable snap ring structure in accordance with claim 1, wherein the locking portion of the snapping hook is a substantially mushroom-shaped body. 3. The retractable snap ring structure in accordance with claim 1, wherein the clamping seat is a substantially pliers-shaped body. 4. The retractable snap ring structure in accordance with claim 1, wherein the clamping seat has a bottom portion formed with a channel. 5. The retractable snap ring structure in accordance with claim 1, wherein the receiving box is a substantially T-shaped hollow box. 6. The retractable snap ring structure in accordance with claim 1, wherein the bottom housing is a substantially wing-shaped box. 7. The retractable snap ring structure in accordance with claim 1, wherein the fixing plate is a substantially rectangular plate. 8. The retractable snap ring structure in accordance with claim 1, wherein the upper washer has a size equal to that of the fixing plate. 9. The retractable snap ring structure in accordance with claim 1, wherein the lower washer is a substantially X-shaped plate. 10. The retractable snap ring structure in accordance with claim 1, further comprising two screws each in turn extended through each of the two through holes of the fixing plate, each of the two through holes of the upper washer, each of the two through holes of the vehicle body and each of the two through holes of the lower washer, and is screwed into each of the two screw bores of the bottom housing, thereby securing the fixing plate, the upper washer, the lower washer and the bottom housing on the vehicle body. 11. The retractable snap ring structure in accordance with claim 1, wherein the hollow hook portion of the snapping hook is substantially rectangular shaped.