Double-drum type curtain drum module

Abstract

Disclosed is a double-drum type curtain drum module, comprising a shell base having two compartments, a first guide wheel, a second guide wheel, an auxiliary cord rotator installed in a first compartment, and two cord drums installed in a second compartment. At least two reinforcing bars in parallel are formed in the first compartment. A plurality of first wheel-connecting grooves are formed on the reinforcing bars for installing the first guide wheel. The second compartment has a plurality of second wheel-connecting grooves formed on a bottom surface of the shell base for installing the second guide wheel. A connecting channel is formed between the reinforcing bars and exposed from the bottom surface of the shell base. The connecting channel extends into the second compartment for coupling the first wheel-connecting grooves and the second wheel-connecting grooves. A control cord reset opening is formed from the first guide wheel to a first end of the connecting channel to align between the curtain auxiliary cord access holes. A control cord transferred opening is formed from the second guide wheel to a second end of the connecting channel. Accordingly, what is solved is the rubbing issue of conventional control cord against the topmost curtain sunshade blade caused by conventional control cord being oblique to the curtain auxiliary cords adjacent to the control cord access holes.

What is claimed is: 
     
         1 . A double-drum type curtain drum module comprising:
 a shell base for installing inside a curtain fixing grooved rail, the shell base having a first compartment and a second compartment, wherein the first compartment has at least two first reinforcing bars inside, wherein the first reinforcing bars are arranged in parallel on which a plurality of first wheel-connecting grooves are formed, wherein the second compartment has a plurality of second wheel-connecting grooves formed on a bottom surface of the shell base, wherein there is a connecting channel formed on the bottom surface of the shell base and between the first reinforcing bars, and the connecting channel extends into the second compartment so that the first wheel-connecting grooves and the second wheel-connecting grooves are formed in the connecting channel, wherein the first compartment further has at least two auxiliary cord access holes at the bottom surface of the shell base;   a first guide wheel having a plurality of first shaft ends installed inside the first wheel-connecting grooves, wherein there is a control cord reset opening formed between the first guide wheel and a first end of the connecting channel and located in the first compartment, wherein the control cord reset opening is aligned between the auxiliary cord access holes;   a second guide wheel having a plurality of second shaft ends installed inside the second wheel-connecting grooves, wherein there is a control cord transferred opening formed between the second guide wheel and a second end of the connecting channel and located in the second compartment, wherein a first vertical distance between the first guide wheel and the bottom surface of the shell base is greater than a second vertical distance between the second guide wheel and the bottom surface of the shell base;   an auxiliary cord rotator installed inside the first compartment for driving an auxiliary cord passing through the auxiliary cord access holes; and   a first cord drum and a second cord drum installed inside the second compartment, the first cord drum and the second cord drum being interlocked to each other for furling and curling a first control cord and a second control cord respectively, wherein a first driving shaft joint hole is formed through a first axial line of the first cord drum, wherein the first guide wheel is configured for guiding the first control cord and the second control cord to pass through the control cord reset opening, the second guide wheel is configured for guiding the first control cord and the second control cord to pass through the control cord transferred opening.   
     
     
         2 . The module as claimed in  claim 1 , wherein each of the first wheel-connecting grooves has a first opening, each of the second wheel-connecting grooves has a second opening, wherein the first opening and the second opening face in opposite directions. 
     
     
         3 . The module as claimed in  claim 1 , wherein the second cord drum has a second driving shaft joint hole formed through a second axial line of the second cord drum. 
     
     
         4 . The module as claimed in  claim 3 , wherein the auxiliary cord rotator has an adjusting shaft joint hole formed through a third axial line of the auxiliary cord rotator. 
     
     
         5 . The module as claimed in  claim 1 , wherein a first wheel side of the first cord drum and a second wheel side of the second cord drum are meshed each other by a plurality of gear teeth. 
     
     
         6 . The module as claimed in  claim 1 , wherein the first control cord is furled inside the first cord drum and the second control cord is furled inside the second cord drum, wherein the first control cord and the second control cord are furled out from the second compartment through the control cord transferred opening, are guided into the first compartment through the second guide wheel and the connecting channel, and then are guided out from the control cord reset opening through the first guide wheel, and wherein the auxiliary cord is fixed on the auxiliary cord rotator by suspension and two extending portions of the auxiliary cord pass through the auxiliary cord access holes. 
     
     
         7 . The module as claimed in  claim 1 , wherein a plurality of second reinforcing bars are obliquely disposed on a bottom inner face of the second compartment, wherein a second height of the second reinforcing bars is smaller than a first height of the first reinforcing bars. 
     
     
         8 . The module as claimed in  claim 7 , wherein the second reinforcing bars are U-shaped and an area of the second compartment circled by the second reinforcing bars is hollowed out. 
     
     
         9 . The module as claimed in  claim 1 , wherein the shell base has a plurality of alignment notches formed at a plurality of corners of two sidewalls of the shell base. 
     
     
         10 . The module as claimed in  claim 1 , wherein each of the first guide wheel and the second guide wheel comprises a pulley and a fixed shaft penetrating through the pulley, wherein a plurality of slopes are formed at a plurality of edges of an wheel surface of the pulley.