Foldable display stand

1. A foldable display stand comprising:

a base;

a leg unit including two leg tubes, each of said leg tubes having a top part that is connected to said base;

two restraining members respectively disposed on said top parts of said leg tubes; and

two support arm assemblies respectively mounted to said leg tubes, each of said support arm assemblies including

a connecting member that is movable along the respective one of said leg tubes and that is blocked by one of said restraining members disposed on the respective one of said leg tubes so as to be prevented from being separated from the respective one of said leg tubes during upward movement thereof relative to the respective one of said leg tubes, and

a support arm that has a connecting section pivotally connected to said connecting member, and a free section extending from said connecting section and away from said connecting member;

wherein each of said support arm assemblies is convertible among a storage state where said support arm of said support arm assembly is substantially retracted into the respective one of said leg tubes, a projecting state where said support arm substantially projects out of the respective one of said leg tubes and where said support arm extends along an extending axis of the respective one of said leg tubes, and a display state where said support arm extends in a direction transverse to the direction of the extending axis of the respective one of said leg tubes.

2. The foldable display stand as claimed in claim 1 , wherein:

each of said restraining members includes a hollow cylinder that is fixedly disposed on said top part of the respective one of said leg tubes of said leg unit; and

said connecting member of each of said support arm assemblies includes a main body that is for separably engaging said hollow cylinder of the respective one of said restraining members so that said connecting member of each of said support arm assemblies is prevented from being separated from the respective one of said leg tubes during upward movement thereof relative to the respective one of said leg tubes.

3. The foldable display stand as claimed in claim 2 , wherein said connecting member of each of said support arm assemblies further includes two pivot lugs that extend substantially upward from said main body of said connecting member, said pivot lugs of said connecting member of each of said support arm assemblies being pivotally connected to said connecting section of said support arm of said support arm assembly.

4. The foldable display stand as claimed in claim 2 , wherein:

said connecting member of each of said support arm assemblies has two blocking surfaces that are formed at said main body of said connecting member; and

said hollow cylinder of each of said restraining members has a bottom surface, said blocking surfaces of said connecting member of each of said support arm assemblies being able to be blocked by said bottom surface of said hollow cylinder of said one of said restraining members disposed on the respective one of said leg tubes so that said connecting member of each of said support arm assemblies is prevented from being separated from the respective one of said leg tubes of said leg unit during upward movement thereof relative to the respective one of said leg tubes.

5. The foldable display stand as claimed in claim 1 , wherein said base has two restraining grooves, said free section of said support arm of each of said support arm assemblies extending through a respective one of said restraining grooves and extending outward of said base when said support arm assemblies are in the display state.

6. The foldable display stand as claimed in claim 5 , further comprising two positioning sets, each of said positioning sets being disposed on said base and said support arm of a respective one of said support arm assemblies.

7. The foldable display stand as claimed in claim 5 , further comprising a top lid that is pivotally connected to said base, said top lid being able to pivot relative to said base between an enclosed position where said top lid covers a top end of said base, and an open position where said top lid uncovers the top end of said base.