Foldable rail for electric opening-closing curtain

1 . A foldable rail for an electric opening-closing curtain, wherein the foldable rail comprises:

a first rail, provided with opposed first end and second end; the first end is connected to a primary transmission box, and a first joint is sleeved on the second end;

a second rail, provided with opposed third end and fourth end; the third end is connected to a secondary transmission box, and a second joint is sleeved on the fourth end;

a connection piece, which is connected to the first joint and the second joint; the first joint and the second joint can rotate relative to the connection piece;

a transmission component, one end of which is connected in a winding way to the primary transmission box and the other end is connected in a winding way to the secondary transmission box; the transmission component runs through the first rail, the first joint, the second joint and the second rail in sequence along a direction from the primary transmission box to the secondary transmission box, wherein

two groups of thread columns which are first thread columns and second thread columns are symmetrically disposed at both sides of the connection piece; the first thread columns are connected to the first joint and the second thread columns are connected to the second joint,

a first connection groove connected to the second end of the first rail in a sleeved way is disposed at an end of the first joint, and the other end of the first joint extends to form two symmetrical first connection arms; a first thread hole cooperating with the corresponding first thread column is disposed on the first connection arms respectively; a second connection groove connected to the fourth end of the second rail in a sleeved way is disposed on one end of the second joint, and the other end of the second joint extends to form two symmetrical second connection arms, each of which is provided with a second thread hole cooperating with the corresponding second thread column, and

a 90° gear angle is disposed on an upper end of the first connection arms and a 90° right angle is disposed on a lower end of the first connection arms; a 90° gear angle is disposed on an upper end of the second connection arms and a 90° right angle is disposed on a lower end of the second connection arms; the gear angle on the first connection arms is meshed correspondingly with the gear angle on the second connection arms; a center of circle of the gear angle on the first connection arms is overlapped with a center of circle of the corresponding first thread holes, and a center of circle of the gear angle on the second connection arms is overlapped with a center of circle of the corresponding second thread holes; when the first rail and the second rail are unfolded to be in one straight line, the right angle on the first connection arms is abutted against the right angle on the corresponding second connection arms; when the first rail and the second rail are folded to be in parallel, a distance between the right angle on the first connection arms and the right angle on the corresponding second connection arms is the largest; when the first rail and the second rail are folded up from the unfolded state, the gear angle on the first connection arms is always meshed with the gear angle on the corresponding second connection arms.

2 . The foldable rail for an electric opening-closing curtain of claim 1 , wherein the thread directions of the first thread columns and the second thread columns are opposite.

3 . A foldable rail for an electric opening-closing curtain, wherein the foldable rail comprises:

a first rail, provided with opposed first end and second end; the first end is connected to a primary transmission box, and a first joint is sleeved on the second end;

a second rail, provided with opposed third end and fourth end; the third end is connected to a secondary transmission box, and a second joint is sleeved on the fourth end;

a connection piece, which is connected to the first joint and the second joint; the first joint and the second joint can rotate relative to the connection piece;

a transmission component, one end of which is connected in a winding way to the primary transmission box and the other end is connected in a winding way to the secondary transmission box; the transmission component runs through the first rail, the first joint, the second joint and the second rail in sequence along a direction from the primary transmission box to the secondary transmission box, wherein

two groups of thread columns which are first thread columns and second thread columns are symmetrically disposed at both sides of the connection piece; the first thread columns are connected to the first joint and the second thread columns are connected to the second joint,

a first connection groove connected to the second end of the first rail in a sleeved way is disposed at an end of the first joint, and the other end of the first joint extends to form two symmetrical first connection arms; a first thread hole cooperating with the corresponding first thread column is disposed on the first connection arms respectively; a second connection groove connected to the fourth end of the second rail in a sleeved way is disposed on one end of the second joint, and the other end of the second joint extends to form two symmetrical second connection arms, each of which is provided with a second thread hole cooperating with the corresponding second thread column, and

a first channel for the transmission component to run through is disposed in the first connection arms; the first channels are in communication with the first connection groove and the first channels are located below the corresponding first thread holes; a second channel for the transmission component to run through is disposed in the second connection arms; the second channels are in communication with the second connection groove and located below the corresponding second thread holes; when the first rail and the second rail are unfolded to be in one straight line, the first channels are in communication with the corresponding second channels.

4 . The foldable rail for an electric opening-closing curtain of claim 3 , wherein the transmission component comprises a wire rope and a belt; the belt is disposed in the first rail and connected to the primary transmission box in a winding way; the wire rope is disposed in the second rail and connected to the secondary transmission box in a winding way; both ends of the wire rope respectively run through the second channels and the first channels to correspondingly connect with both ends of the belt to form a closed loop.

5 . The foldable rail for an electric opening-closing curtain of claim 4 , wherein two segments of hose are symmetrically sleeved on the wire rope at both sides of the connection piece; the two segments of hose are located inside the first channels and the corresponding second channels; when the first rail and the second rail are unfolded to be in one straight line, the two segments of hose are shaped like a straight line, and when the first rail and the second rail are folded to be in parallel, the two segments of hose are shaped like “U”.

6 . The foldable rail for an electric opening-closing curtain of claim 4 , wherein a first pulley block is disposed in the first rail and a second pulley block is disposed in the second rail; the first pulley block and the second pulley block are connected to the transmission component to achieve synchronous movement; the first pulley block and the second pulley block move toward each other.

7 . The foldable rail for an electric opening-closing curtain of claim 6 , wherein at least one adjusting assembly for adjusting a length of the wire rope is disposed in the second pulley block; the adjusting assembly comprises a spring and a push block; a spring groove for accommodating the spring and the push block is disposed in the second pulley block; one end of the spring is abutted against an inner wall of the spring groove and the other end is abutted against the push block; the wire rope runs through an entry of the second pulley block and winds on the push block and then runs out of an exit of the second pulley block; the entry and the exit of the second pulley block are in a same straight line; the opening direction of the spring groove is perpendicular to the direction of the entry and the exit.

8 . The foldable rail for an electric opening-closing curtain of claim 7 , wherein an odd number of adjusting assemblies are disposed in the second pulley block; a first adjusting assembly is near the entry, with the push block of the first adjusting assembly being at a side away from the entry; the push blocks in adjacent adjusting assemblies are disposed in opposite directions; a last adjusting assembly is near the exit, with the push block in the last adjusting assembly disposed in the same direction as that in the first adjusting assembly; the wire rope runs through the entry of the second pulley block and winds around the adjusting assemblies in “S” shape and then runs out of the exit of the second pulley block; when the first rail and the second rail are folded to be in parallel, the wire rope is tensioned, and the wire rope can squeeze the push blocks and compress the springs to shorten the distance between adjacent push blocks, and the length of the wire rope is increased; when the first rail and the second rail are unfolded to be in one straight line, the wire rope is loosened, and the springs restore to increase the distance between adjacent push blocks, and shorten the length of the wire rope.

9 . The foldable rail for an electric opening-closing curtain of claim 8 , wherein a detachable top cover for covering the adjusting assemblies is disposed on the second pulley block.