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A joint with a protrusion rod has a male buckle and a female buckle engaged with each other. The male buckled has a hollow insertion stub with multiple expansion slots and has a receiving hole to movably receive a protrusion rod. A distal end of the protrusion rod is movably engaged with the inserti

A joint with a protrusion rod has a male buckle and a female buckle engaged with each other. The male buckled has a hollow insertion stub with multiple expansion slots and has a receiving hole to movably receive a protrusion rod. A distal end of the protrusion rod is movably engaged with the insertion stub. The protrusion rod has a locking plate and multiple fins correspondingly engaged with the expansion slots when the protrusion rod is wedged into the insertion stub. By having the above structure, difficulty of disengagement of the protrusion rod from the insertion stub is significantly increased to prevent the disengagement of the male buckle and the female buckle. Thus, the joint has increased combination strength and is excellent in utility.

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1. A joint comprising: a male buckle and a female buckle engaged with each other, wherein the male buckle has a hollow insertion stub with multiple expansion slots and has a receiving hole and a mount recess communicating with the receiving hole;a protrusion rod movably received inside the receiving

1. A joint comprising: a male buckle and a female buckle engaged with each other, wherein the male buckle has a hollow insertion stub with multiple expansion slots and has a receiving hole and a mount recess communicating with the receiving hole;a protrusion rod movably received inside the receiving hole of the male buckle and having multiple fins correspondingly aligned with and operationally engaged with the expansion slots when the protrusion rod is wedged into the insertion stub; anda locking plate mounted to the protrusion rod by a mount, with the mount slideably received in the mount recess for slideable movement parallel to the receiving hole and the protrusion rod, with the locking plate being parallel to and spaced from the protrusion rod. 2. The joint as claimed in claim 1, wherein the number of the expansion slots is at least two and the number of the fins is the same as the number of the expansion slots; and wherein the expansion slots are evenly defined around the insertion stub. 3. The joint as claimed in claim 1, wherein the male buckle has a plate recess parallel to and spaced from the receiving hole to accommodate the locking plate and intersecting the mount recess; and wherein the plate recess is in a shape of a dovetail recess perpendicular to the slideable movement. 4. The joint as claimed in claim 3, wherein a front surface of the locking plate is spaced from a front end of the male buckle with a gap located in the plate recess when the protrusion rod is accommodated in the receiving hole of the male buckle and the protrusion rod is wedged into the insertion stub. 5. The joint as claimed in claim 3, wherein a rear end of the locking plate extends out of the plate recess when the protrusion rod is pushed backward to the receiving hole. 6. The joint as claimed in claim 1, wherein the male buckle has a plate recess parallel to and spaced from the receiving hole to accommodate the locking plate and intersecting the mount recess; and wherein the plate recess is in a shape of an inverted T-shaped recess perpendicular to the slideable movement. 7. The joint as claimed in claim 6, wherein a front surface of the locking plate is spaced from a front end of the male buckle with a gap located in the plate recess when the protrusion rod is accommodated in the receiving hole of the male buckle and the protrusion rod is wedged into the insertion stub. 8. The joint as claimed in claim 6, wherein a rear end of the locking plate extends out of the plate recess when the protrusion rod is pushed backward to the receiving hole. 9. The joint as claimed in claim 1, wherein the locking plate has multiple anti-slip grooves. 10. The joint as claimed in claim 1, wherein the male buckle is composed of two semi-bodies; and wherein one of the two semi-bodies has a tenon and another of the two semi-bodies has a corresponding mortise to make the tenon engaged with the mortise. 11. The joint as claimed in claim 1, wherein the male buckle and the female buckle have multiple annular stops defined on an outer periphery respectively. 12. The joint as claimed in claim 1, wherein a periphery of the male buckle has multiple dimples for accommodating glue. 13. The joint as claimed in claim 1, wherein the female buckle has a cover mounted to a rear end of the female buckle.