Collapsible peripheral frame and bed frame having same

A bed frame, comprising:

• a first outer lateral bar unit disposed at a head side of the bed frame;
• a second outer lateral bar unit disposed at a foot side of the bed frame;
• first, second and third longitudinal bar units disposed at each of first and second sides of the bed frame between the first and second outer lateral bar units;
• and
• a receptacle at each of the first and second side of the bed frame;
• wherein at the first side of the bed frame:
• a first end of the first longitudinal bar unit is connected with a first end of the first outer lateral bar unit;
• a second end of the first longitudinal bar unit is rotatably connected with a first end of the second longitudinal bar unit;
• a second end of the second longitudinal bar unit is rotatably connected with a first end of the third longitudinal bar unit;
• and
• a second end of the third longitudinal bar unit is rotatably connected with a first end of the second outer lateral bar unit;
• wherein at the second side of the bed frame:
• a first end of the first longitudinal bar unit is connected with a second end of the second outer lateral bar unit;
• a second end of the first longitudinal bar unit is rotatably connected with a first end of the second longitudinal bar unit;
• a second end of the second longitudinal bar unit is rotatably connected with a first end of the third longitudinal bar unit;
• and
• a second end of the third longitudinal bar unit is rotatably connected with a second end of the first outer lateral bar unit;
• wherein each of the first, second and third longitudinal bar units comprises an elongated upper bar and an elongated lower bar, the elongated upper and lower bars being separated from each other in a height direction of the bed frame;
• wherein at each of the first and second sides of the bed frame:
• the elongated upper bars of the first, second and third longitudinal bar units are aligned with each other along a longitudinal direction of the bed frame when the bed frame is expanded;
• the elongated lower bars of the first, second and third longitudinal bar units are aligned with each other along the longitudinal direction of the bed frame when the bed frame is expanded;
• and
• the receptacle is connected to the upper and lower bars of the second longitudinal bar unit adjacent to the second end thereof, wherein the receptacle comprises an upper slot and a lower slot, the upper slot is configured to removably receive an end of an upper bar of an inner lateral bar unit and the lower slot is configured to removably receive an end of a lower bar of the inner lateral bar unit.