Foldable trampoline

1. A foldable trampoline, comprising:

a frame consisting of a plurality of frame sections;

a jumping bed located within said frame;

a plurality of elastic elements, each of which having an outer end fixedly connected to said frame, and an inner end fixedly connected to an outer periphery of said jumping bed, so that said jumping bed is tightly stretched over said frame to provide a required rebounding force; and

a plurality of supporting legs separately connected to each joint of two said frame sections that are adjacent to one another; and

at least two knuckle mechanisms provided at two opposite ones of said joints of said frame sections;

said knuckle mechanism including two clamp brackets separately provided at two opposed ends of two said adjacent frame sections at said joint; said clamp brackets being fixedly connected at respective rear ends to said frame sections, and having a front end formed into two spaced arms; said front end of each said clamp bracket extending forward to project beyond said end of said frame sections by a predetermined length and then turned downward to form two lug portions; said lug portions of said two opposed clamp brackets being overlapped and pivotally connected to each other via a shaft pin extended therethrough; and said shaft pin also being extended through one said supporting leg located thereat, such that two said frame sections connected via said knuckle mechanism may be pivotally turned about said shaft pin toward two lateral sides of said supporting leg located thereat.

2. The foldable trampoline as claimed in claim 1 , wherein said spaced arms at said front end of each said clamp bracket are extended beyond said end of said frame section by a length not smaller than a distance by which said end of said frame section is displaced when being pivotally turned about said shaft pin by 90 degrees.

3. The foldable trampoline as claimed in claim 1 , wherein said overlapped lug portions of said two clamp brackets are correspondingly provided at a point opposite to said shaft pin with through holes; and a safety pin being adapted to insert through said through holes when said trampoline is in a fully extended state.

4. A foldable trampoline, comprising:

a frame consisting of four frame sections;

a jumping bed located within said frame;

a plurality of elastic elements, each of which having an outer end fixedly connected to said frame, and an inner end fixedly connected to an outer periphery of said jumping bed, so that said jumping bed is tightly stretched over said frame to provide a required rebounding force;

four supporting legs separately connected to each joint of two said frame sections that are adjacent to one another; two of said four supporting legs located at two opposite first joints being movable legs that are detachably screwed to said frame sections, and the other two of said supporting legs located at two opposite second joints being fixed legs that are pivotally connected to said frame sections;

two first knuckle mechanisms provide at said first joints; and

two second knuckle mechanisms provided at said second joints;

said first knuckle mechanism including two long tabs provided at upper and lower sides of an end of a first one of said frame sections at said first joint, and two short tabs provided at an end of a second one of said frame sections at said first joint; said long tabs inward and forward extending to project beyond the end of said first frame section by a predetermined length; said short tabs being extended toward and pivotally connected to the projected portion of said long tabs via a shaft pin, and said end of said first frame section at said first joint having a reduced outer diameter that is slightly smaller than an outer diameter of said frame sections forming said frame; and

said second knuckle mechanism including two clamp brackets separately provided at two opposed ends of two said adjacent frame sections at said second joint; said clamp brackets being fixedly connected at respective rear ends to said frame sections, and having a front end formed into two spaced arms; said front end of each said clamp bracket extending forward to project beyond said end of said frame sections by a predetermined length and then turned downward to form two lug portions; said lug portions of said two opposed clamp brackets being overlapped and pivotally connected to each other via a shaft pin extended therethrough; and said shaft pin also being extended through one said supporting leg located thereat, such that two said frame sections connected via said knuckle mechanism may be pivotally turned about said shaft pin toward two lateral sides of said supporting leg located thereat.

5. The foldable trampoline as claimed in claim 4 , wherein said spaced arms at said front end of each said clamp bracket are extended beyond said end of said frame section by a length not smaller than a distance by which said end of said frame section is displaced when being pivotally turned about said shaft pin by 90 degrees.

6. The foldable trampoline as claimed in claim 4 , wherein said overlapped lug portions of said two clamp brackets are correspondingly provided at a point opposite to said shaft pin with through holes; and a safety pin being adapted to insert through said through holes when said trampoline is in a fully extended state.