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A foldable post for a shelving apparatus includes an upper post member, a lower post member, and a post joint for connecting the upper and lower post members end-to-end. The post joint includes an engaging tongue extended from an end portion of the first post wall of the upper post member, an engagi

A foldable post for a shelving apparatus includes an upper post member, a lower post member, and a post joint for connecting the upper and lower post members end-to-end. The post joint includes an engaging tongue extended from an end portion of the first post wall of the upper post member, an engaging groove provided at an end portion of the first post wall of the lower post member, and a pivot hinge pivotally coupled the second post walls of the upper and lower post members, such that when the upper and lower post members are pivotally moved to engage the engaging tongue with the engaging groove, to the upper and lower post members are interlocked and coupled with each other end-to-end.

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1. A foldable post for a shelving apparatus, comprising: upper and lower post members; anda post joint for connecting said upper and lower post members end-to-end, wherein said post joint comprises a pivot hinge pivotally coupled with said upper and lower post members and an interlock unit that inte

1. A foldable post for a shelving apparatus, comprising: upper and lower post members; anda post joint for connecting said upper and lower post members end-to-end, wherein said post joint comprises a pivot hinge pivotally coupled with said upper and lower post members and an interlock unit that interlocks upper and lower post members with each other end-to-end, such that when said upper and lower post members are pivotally moved end-to-end, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein each of said upper and lower post members has a first post wall and a second post wall extended from said first wall at an angle, wherein a first engaging tongue is extended from one of said first and second post walls of said upper post member and a second engaging tongue is extended from one of said first and second post walls of said lower post member, wherein said interlock unit comprises an engaging tongue extended from an end portion of said first post wall of said upper post member and an engaging groove provided at an end portion of said first post wall of said lower post member, such that when said upper and lower post members are pivotally moved to engage said engaging tongue with said engaging groove, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein said post joint further comprises two coupling sleeves coupling with said end portions of said upper and lower post members respectively, wherein said pivot hinge is formed between said coupling sleeves to pivotally couple said upper and lower post members. 2. The foldable post, as recited in claim 1, further comprising a post locker for releasably locking said upper and lower post members, wherein said post locker comprises a locking slot provided at said lower post member and a locking latch provided at said upper post member, such that when said upper and lower post members are pivotally moved to engage said engaging tongue with said engaging groove, said locking latch is actuated to engage with said locking slot to retain said upper and lower post members to be coupled with each other end-to-end. 3. The foldable post, as recited in 2, wherein said post locker further comprises a guiding slot provided at said upper post member to align with said locking slot, wherein said locking latch is guided to slide at said guiding slot to selectively lock up with said locking slot. 4. A foldable post for a shelving apparatus, comprising: upper and lower post members; anda post joint for connecting said upper and lower post members end-to-end, wherein said post joint comprises a pivot hinge pivotally coupled with said upper and lower post members and an interlock unit that interlocks upper and lower post members with each other end-to-end, such that when said upper and lower post members are pivotally moved end-to-end, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein each of said upper and lower post members has a first post wall and a second post wall extended from said first wall at an angle, wherein a first engaging tongue is extended from one of said first and second post walls of said upper post member and a second engaging tongue is extended from one of said first and second post walls of said lower post member, wherein said interlock unit comprises an engaging tongue extended from an end portion of said first post wall of said upper post member and an engaging groove provided at an end portion of said first post wall of said lower post member, such that when said upper and lower post members are pivotally moved to engage said engaging tongue with said engaging groove, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein said post joint further comprises an additional engaging groove extended from an end portion of said second post wall of said upper post member adjacent to said engaging tongue thereof, and an additional engaging tongue provided at an end portion of said second post wall of said lower post member adjacent to said engaging groove thereof, such that when said upper and lower post members are pivotally moved to engage said additional engaging tongue with said additional engaging groove, said upper and lower post members are coupled with each other end-to-end, wherein said post joint further comprises a first coupling sleeve and a second coupling sleeve coupling with said end portions of said upper and lower post members respectively, wherein said pivot hinge is formed between said first and second coupling sleeves to pivotally couple said upper and lower post members. 5. The foldable post, as recited in claim 4, further comprising a post locker for releasably locking said upper and lower post members, wherein said post locker comprises a locking slot provided at said lower post member and a locking latch provided at said upper post member, such that when said upper and lower post members are pivotally moved to engage said engaging tongue with said engaging groove, said locking latch is actuated to engage with said locking slot to retain said upper and lower post members to be coupled with each other end-to-end. 6. The foldable post, as recited in claim 5, wherein said post locker further comprises a guiding slot provided at said upper post member to align with said locking slot, wherein said locking latch is guided to slide at said guiding slot to selectively lock up with said locking slot. 7. The foldable post, as recited in claim 6, wherein said guiding slot and said locking slot are formed at said coupling sleeves respectively. 8. The foldable post, as recited in claim 6, wherein said pivot hinge is formed on a side edge of said first coupling sleeve and said post locker is formed at an opposed side edge of said second coupling sleeve. 9. A foldable post for a shelving apparatus, comprising: upper and lower post members; anda post joint for connecting said upper and lower post members end-to-end, wherein said post joint comprises a pivot hinge pivotally coupled with said upper and lower post members and an interlock unit that interlocks upper and lower post members with each other end-to-end, such that when said upper and lower post members are pivotally moved end-to-end, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein said interlock unit comprises a first engaging tongue extended from an end portion of said upper post member and a second engaging tongue extended from an end position of said lower post member, such that when said upper and lower post members are pivotally moved to engage said first engaging tongue with said lower post member and to engage said second engaging tongue with said upper post member, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein said post joint further comprises two coupling sleeves coupling with said end portions of said upper and lower post members respectively, wherein said pivot hinge is formed between said coupling sleeves to pivotally couple said upper and lower post members. 10. A foldable post for a shelving apparatus, comprising: upper and lower post members; anda post joint for connecting said upper and lower post members end-to-end, wherein said post joint comprises a pivot hinge pivotally coupled with said upper and lower post members and an interlock unit that interlocks upper and lower post members with each other end-to-end, such that when said upper and lower post members are pivotally moved end-to-end, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein said interlock unit comprises a first engaging tongue extended from an end portion of said upper post member and a second engaging tongue extended from an end position of said lower post member, such that when said upper and lower post members are pivotally moved to engage said first engaging tongue with said lower post member and to engage said second engaging tongue with said upper post member, said upper and lower post members are interlocked and coupled with each other end-to-end, wherein each of said upper and lower post members has a first post wall and a second post wall extended from said first wall at an angle, wherein said first engaging tongue is extended from one of said first and second post walls of said upper post member and said second engaging tongue is extended from one of said first and second post walls of said lower post member, wherein said post joint further comprises two coupling sleeves coupling with said end portions of said upper and lower post members respectively, wherein said pivot hinge is formed between said coupling sleeves to pivotally couple said upper and lower post members. 11. The foldable post, as recited in claim 9, further comprising a post locker for releasably locking said upper and lower post members, wherein said post locker comprises a locking slot provided at said lower post member and a locking latch provided at said upper post member, such that when said upper and lower post members are pivotally moved to interlock with each other via said first and second engaging tongues, said locking latch is actuated to engage with said locking slot to retain said upper and lower post members to be coupled with each other end-to-end. 12. The foldable post, as recited in claim 10, further comprising a post locker for releasably locking said upper and lower post members, wherein said post locker comprises a locking slot provided at said lower post member and a locking latch provided at said upper post member, such that when said upper and lower post members are pivotally moved to interlock with each other via said first and second engaging tongues, said locking latch is actuated to engage with said locking slot to retain said upper and lower post members to be coupled with each other end-to-end. 13. The foldable post, as recited in claim 11, wherein said post locker further comprises a guiding slot provided at said upper post member to align with said locking slot, wherein said locking latch is guided to slide at said guiding slot to selectively lock up with said locking slot. 14. The foldable post, as recited in claim 12, wherein said post locker further comprises a guiding slot provided at said upper post member to align with said locking slot, wherein said locking latch is guided to slide at said guiding slot to selectively lock up with said locking slot. 15. The foldable post, as recited in claim 13, wherein said guiding slot and said locking slot are formed at said coupling sleeves respectively. 16. The foldable post, as recited in claim 14, wherein said guiding slot and said locking slot are formed said two coupling sleeves respectively. 17. The foldable post, as recited in claim 13, wherein said pivot hinge is formed one side edge of said first coupling sleeve and said post locker is formed at an opposed side edge of said second coupling sleeve. 18. The foldable post, as recited in claim 16, wherein said pivot hinge is formed one side edge of said first coupling sleeve and said post locker is formed at an opposed side edge of said second coupling sleeve.