Tensioning mechanism for a cot and a cot thereof

1. A canvas having a tensioning mechanism for a cot, the cot comprising two side rods ( 1 ) disposed at two sides of the canvas, the tensioning mechanism comprising a support component ( 2 ), a fixed fastener ( 3 ), and a movable fastener ( 4 );

wherein,

the tensioning mechanism is configured to receive the two side rods ( 1 );

the support component ( 2 ) has a first support rod ( 21 ) and a second support rod ( 22 ) each having a top, respectively extending toward two sides of the canvas;

the fixed fastener ( 3 ) is disposed on the top of the first support rod ( 21 ) and is configured to be buckled on one of the two side rods ( 1 );

the movable fastener ( 4 ) is rotatably disposed on the top of the second support rod ( 22 ) and is configured to be buckled on the other of the two side rods ( 1 ); and the movable fastener ( 4 ) is configured to rotate in a direction which increases tension on the canvas and causes clamping on the second support rod ( 22 ); wherein

the movable fastener ( 4 ) comprises a main body ( 41 ) rotatably connected to the second support rod ( 22 ) and a buckling portion ( 42 ) connected to the top of the main body ( 41 );

the buckling portion ( 42 ) has a clamping groove ( 421 ) for receiving the side rod ( 1 );

the main body ( 41 ) has an accommodating groove ( 411 ) for receiving the second support rod ( 22 ), and the main body ( 41 ) clamps on the second support rod ( 22 ) after the canvas is tensioned;

first and second elastic limiting protrusions ( 5 ) respectively biased towards opposing sidewalls of the accommodating groove ( 411 ) are disposed on the second support rod ( 22 ), correspondingly, the main body ( 41 ) has first and second staggered limiting holes ( 412 ) respectively located on the opposing sidewalls of the accommodating groove ( 411 ) for respectively receiving the first and second limiting protrusions ( 5 )

the second support rod ( 22 ) is a hollow pipe, and a mounting block ( 7 ) for receiving the elastic limiting protrusions ( 5 ) is disposed inside the second support rod ( 22 );

the mounting block ( 7 ) has a plurality of mounting recesses ( 71 ) for mounting the elastic limiting protrusions ( 5 ), and an elastic piece ( 6 ) is disposed inside each mounting recess ( 71 ) pushing each limiting protrusion ( 5 ) to protrude out of the second support rod ( 22 ).

2. The tensioning mechanism of claim 1 , wherein the first and second limiting holes are ( 412 ) facing each other, and the first and second limiting protrusions ( 5 ) are respectively disposed on left and right sides of the second support rod ( 22 ).

3. The tensioning mechanism of claim 2 , wherein the first and second limiting protrusions ( 5 ) on the second support rod ( 22 ) are located at different heights along the length of the second support rod ( 22 ).

4. The tensioning mechanism of claim 1 , wherein first and second operating members ( 8 ) are movably disposed inside a respective one of the first and second limiting holes ( 412 ) so as to push the corresponding limiting protrusion ( 5 ) to move along the respective limiting hole ( 412 ).

5. The tensioning mechanism of claim 1 , wherein the main body ( 41 ) has a plurality of inclined guide surfaces ( 413 ) for guiding the first and second limiting protrusion ( 5 ) to enter into the respective limiting holes ( 412 ).

6. A cot, comprising a piece of canvas and two side rods ( 1 ) disposed at two sides of the canvas; the cot further comprises at least two canvas tensioning mechanisms of claim 1 , which are disposed along a lengthwise direction of the cot.

7. The cot of claim 6 , wherein the movable fasteners ( 4 ) of the canvas tensioning mechanisms are disposed on a same side of the cot.