Patent Publication Number: US-9888767-B1

Title: Towel rack with multiple usage modes

Description:
This application claims priority to Chinese Patent Application Ser. No. CN2016109781496 filed 7 Nov. 2016 and CN2016212018462 filed 7 Nov. 2016. 
     TECHNICAL FIELD 
     The present invention relates to a towel rack, in particular to a towel rack with multiple usage modes. 
     BACKGROUND 
     In daily life, in order to facilitate packaging and using of products, some folding positioning towel racks are usually used in a smaller bathroom, so that products can be folded in the non-use state to reduce space occupied by them, and to facilitate placing, packaging and using. 
     Currently, the relative angle between the folding positioning towel rack and the wall is 0 degree or 90 degrees on the market, the towel rack is sheathed in the groove or through hole in the wall through the shaft on the two ends thereof to achieve rotation, and in addition to, the wall is provided with positioning platform to limit rotation and sagging of the towel rack. However, in the use of the process, adjustable angle of the towel rack is limited, and will fall to hit people in non-use state of folding without restrictions against the wall. 
     It is necessary to develop a new folding positioning towel bar to improve its performance, and to meet people&#39;s daily needs. 
     DESCRIPTION 
     In view of drawbacks of the prior art, the present invention provides a towel rack with multiple usage modes, which can be quickly adjusted and locked, and has advantages of multi-angle adjustment, simple processing and assembling, convenient and labor-saving adjustment, beautiful appearance, and high safety performance. 
     The technical solution of the present invention is summarized as follows: 
     A towel rack with multiple usage modes, comprising: 
     A first connecting rod; 
     A second connecting rod; 
     A pair of large skeletons, each large skeleton including a first upper rod and a first lower rod, wherein the first upper rod of the left side large skeleton is connected to the left side of the first connecting rod by a first rotation positioning member, and the first upper rod of the right side large skeleton is connected to the right side of the first connecting rod through a second rotation positioning member, and wherein both ends of the left side large skeleton are penetrated. A first button is provided in the inside of the left side large skeleton. And the first button is arranged in such a manner that the pair of large skeletons and the first connecting rod are in a state in which relative rotation can occur when the first button are pressed, and the pair of large skeletons is in a locked state with the first connecting rod when the first button is released; 
     A pair of small skeletons, each small skeleton including a second upper rod and a second lower rod, wherein the second upper rod of the left side small skeleton is connected to the left side of the first lower rod of the left side large skeleton by a third rotation positioning member, and the second upper rod of the right side small skeleton is connected to the right side of the first lower rod of the right side large skeleton through a fourth rotation positioning member, and the second connecting rod is fixedly connected between the second lower rod of the pair of small skeletons. Wherein both ends of the left side small skeleton are penetrated. A second button is provided in the inside of the left side small skeleton. And the first button is arranged in such a manner that the pair of small skeletons and the pair of large skeletons are in a state in which relative rotation can occur when the second button are pressed, and the pair of small skeletons is in a locked state with the pair of large skeletons when the second button is released. 
     Preferably, the towel rack with multiple usage modes, wherein the first rotation positioning member contains: 
     A first tooth formed on an inner wall of the first connecting rod; 
     A second tooth formed on an inner wall of the first upper rod of the left side large skeleton; 
     A first screw hole formed in the interior of the first connecting rod; 
     A first connecting screw having one end extending into the inside of the first upper rod of the left side large skeleton and the other end threadedly connecting to the first screw hole; 
     A first positioning wheel slidably fitted on the first connecting screw, and the first positioning wheel having a third tooth engaging with the first tooth and the second tooth, the first positioning wheel abuting against the first button; 
     A first return spring sheathed on the first connecting screw, one end of the first return spring connecting to the first positioning wheel and the other end connecting to the inner wall of the first connecting rod; 
     The second rotation positioning member comprising: 
     A second screw hole formed in the interior of the first upper rod of the right side large skeleton; 
     A first limit screw having one end extending into the interior of the first connecting rod and the other end threadedly connecting to the second screw hole; 
     A first cam having a first end face tooth, a first concave wheel having a second end face tooth, the first cam and the first concave wheel being engaged with each other, and the first cam and the first concave wheel slidably fitting on the first limit screw, wherein the first cam is provided in the first connecting rod, and the first concave wheel is disposed inside the first upper rod of the right side large skeleton; 
     A second return spring which is sheathed on the first limit screw, and has one end connecting to the first concave wheel and the other end connecting to the first upper rod of the right side large skeleton; 
     When the first button is pressed, the first positioning wheel moves in the direction of the first connecting rod until separating from the second tooth so that the left side large skeleton and the first connecting rod are in a state in which relative rotation can occur, and the first concave wheel moves in the direction of the right side large skeleton by the action of the first connecting rod so that the first concave wheel and the first cam are disengaged from each other, so that the right side large skeleton and the first connecting rod are in a state in which relative rotation can occur; 
     When the first button is released, the first positioning wheel moves in the direction of the left side large skeleton by the elastic force of the first return spring until it is simultaneously engaged with the first tooth and the second tooth, so that the left side large skeleton is in a locked state with the first connecting rod, and the first concave wheel moves in the direction of the first connecting rod by the elastic force of the second return spring until the first concave wheel and the first cam are engaged with each other so that the right side large skeleton is in a locked state with the first connecting rod. 
     Preferably, the towel rack with multiple usage modes, the third rotation positioning member contains: 
     A fourth tooth formed on an inner wall of the second upper rod of the left side small skeleton; 
     A fifth tooth formed on an inner wall of the first lower rod of the left side large skeleton; 
     A third screw hole formed in the interior of the second upper rod of the left side small skeleton; 
     A second connecting screw having one end extending into the inside of the first lower rod of the left side large skeleton and the other end threadedly connecting to the third screw hole; 
     A second positioning wheel slidably fitted on the second connecting screw, and the second positioning wheel having a sixth tooth engaging with the fourth tooth and the fifth tooth, the second positioning wheel abuting against the second button; 
     A third return spring sheathed on the second connecting screw, one end of the third return spring connecting to the second positioning wheel and the other end connecting to an inner wall of the first lower rod of the left side large skeleton; 
     The fourth rotation positioning member comprising: 
     A fourth screw hole formed in the interior of the second upper rod of the right side small skeleton; 
     A second limit screw having one end extending into the interior of the first lower rod of the right side large skeleton and the other end threadedly connecting to the fourth screw hole; 
     A second cam having a third end face tooth, a second concave wheel having a fourth end face tooth, the second cam and the second concave wheel being engaged with each other, and the second cam and the second concave wheel slidably fitting on the second limit screw, wherein the second cam is provided in the right side large skeleton, and the second concave wheel is disposed inside the second upper rod of the right side small skeleton; 
     A fourth return spring which is sheathed on the second limit screw, and has one end connecting to the second concave wheel and the other end connecting to the second upper rod of the right side small skeleton; 
     When the second button is pressed, the second positioning wheel moves in the direction of the left side large skeleton until separating from the fifth tooth so that the left side large skeleton and the left side small skeleton are in a state in which relative rotation can occur, and the second concave wheel moves in the direction of the right side small skeleton by the action of the second connecting rod so that the second concave wheel and the second cam are disengaged from each other, so that the right side large skeleton and the right side small skeleton are in a state in which relative rotation can occur; 
     When the second button is released, the second positioning wheel moves in the direction of the left side small skeleton by the elastic force of the third return spring until it is simultaneously engaged with the fourth tooth and the fifth tooth, so that the left side large skeleton is in a locked state with the left side small skeleton, and the second concave wheel moves in the direction of the right side large skeleton by the elastic force of the fourth return spring until the second concave wheel and the second cam are engaged with each other so that the right side large skeleton is in a locked state with the right side small skeleton. 
     Preferably, the towel rack with multiple usage modes, wherein the outer circumference of the first positioning wheel is annularly arranged with eight third teeth, and the outer circumference of the second positioning wheel is annularly arranged with eight sixth teeth, and the right end face of the first cam having eight first end face teeth with an annular arrangement, the left end face of the first concave wheel having eight second end face teeth with an annular arrangement, the right end face of the second cam having eight third end face teeth with an annular arrangement, and the right end face of the second concave wheel having eight fourth end face teeth with an annular arrangement. 
     Preferably, the towel rack with multiple usage modes, wherein the left end face of the first cam has four annularly arranged first convex feet, the left end face of the second cam has four annularly arranged second convex feet, the right end face of the first concave wheel has four annularly arranged third convex feet, and the right end face of the second concave wheel has four annularly arranged fourth convex feet; the interior of the first connecting rod having four annularly arranged first grooves, the interior of the first upper rod of the right side large skeleton having four annularly arranged second grooves, the interior of the first lower rod of the right side large skeleton having four annularly arranged third grooves, the interior of the second upper rod of the right side small skeleton having four annularly arranged fourth grooves; wherein the first convex feet and the first grooves are fixed to each other, the second convex feet and the second grooves are fixed to each other, the third convex feet and the third grooves are fixed to each other, and the fourth convex feet and the fourth grooves are fixed to each other. 
     Preferably, the towel rack with multiple usage modes, wherein the first button includes a first body and four fifth convex feet connected to the right side of the first body, and when the first button is pressed, the fifth convex feet sliding along a through groove opened on the inside of the left side large skeleton, and the fifth convex feet abutting against the first positioning wheel, the second button including a second body and four sixth convex feet connected to the right side of the second body, and when the second button is pressed, the sixth convex feet sliding along a through groove opened on the inside of the left side small skeleton, and the sixth convex feet abutting against the second positioning wheel. 
     Preferably, the towel rack with multiple usage modes, also contains: 
     A first nut provided at the left end of the first upper rod of the left side large skeleton for stopping the first button, 
     A second nut provided at the left end of the second upper rod of the left side small skeleton for stopping the second button. 
     Preferably, the towel rack with multiple usage modes, the first limit screw is sheathed with a first opening gasket opening a first arcuate groove, the opening direction of the first arcuate groove being directed toward the left, a first fastening bolt being connected to the first upper rod of the right side large skeleton and passing upwardly through the first arcuate groove; the second limit screw being sheathed with a second opening gasket opening a second arcuate groove, the opening direction of the second arcuate groove being directed toward the left, a second fastening bolt being connected to the second upper rod of the right side small skeleton and passing upwardly through the second arcuate groove. 
     Preferably, the towel rack with multiple usage modes, wherein the left side large skeleton, the left side small skeleton, the right side large skeleton, and the right side small skeleton are integrally formed. 
     The towel rack with multiple usage modes of the present invention uses the first button to control mutual loosening and locking between the left side large skeleton and the first connecting rod, and the second button is used to control mutual loosening and locking between the left side small skeleton and the left side large skeleton. The towel rack can form a variety of angles and states. The present invention has the advantages of quick adjustment and locking, multi-angle adjustment, easy processing and assembling, convenient and easy adjustment, beautiful appearance, high safety performance and difficult to fail. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an assembly exploded view of the left side of the towel rack with multiple usage modes of the present invention; 
         FIG. 2  is an assembly exploded view of the right side of the towel rack with multiple usage modes of the present invention; 
         FIG. 3  is a sectional view of a first rotation position of the towel rack with multiple usage modes of the present invention (the relative angle of the left side small skeleton and the left side large skeleton is 0 degree, and the second button is pressed); 
         FIG. 4  is a sectional view of a first rotation position of the towel rack with multiple usage modes of the present invention (the relative angle of the left side small skeleton and the left side large skeleton is 0 degree, and the second button is released); 
         FIG. 5  is a morphology view of a second rotation position of the towel rack with multiple usage modes of the present invention (the relative angle of the left side small skeleton and the left side large skeleton is 90 degrees, and the relative angle of the left side large skeleton and the first connecting rod is 0 degree); 
         FIG. 6  is a morphology view of a third rotation position of the towel rack with multiple usage modes of the present invention (the relative angle of the left side small skeleton and the left side large skeleton is 45 degrees, and the relative angle of the left side large skeleton and the first connecting rod is 45 degrees); 
         FIG. 7  is a morphology view of a fourth rotation position of the towel rack with multiple usage modes of the present invention (the relative angle of the left side small skeleton and the left side large skeleton is 0 degree, and the relative angle of the left side large skeleton and the first connecting rod is 90 degrees); 
         FIG. 8  is a part view of the first button of the towel rack with multiple usage modes of the present invention; 
         FIG. 9  is a partial view of the second tooth and the through groove of the first upper rod of the left side large skeleton of the towel rack with multiple usage modes of the present invention; 
         FIG. 10  is a part view of the first positioning wheel of the towel rack with multiple usage modes of the present invention; 
         FIG. 11  is a part view of a first opening bush of the towel rack with multiple usage modes of the present invention; 
         FIG. 12  is a part view of the first opening gasket of the towel rack with multiple usage modes of the present invention; 
         FIG. 13( a )  is a part view of the first cam of the towel rack with multiple usage modes of the present invention; and 
         FIG. 13( b )  is a part view of the first concave wheel of the towel rack with multiple usage modes of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     The present invention will now be described in further detail with reference to the accompanying drawings as required: 
     As shown in  FIG. 1  to  FIG. 7 , the present invention provides a towel rack with multiple usage modes, comprising: a first connecting rod  9 , a second connecting rod  21 ; a pair of large skeletons, each large skeleton including a first upper rod and a first lower rod, wherein the first upper rod  53  of the left side large skeleton  8  is connected to the left side of the first connecting rod  9  by a first rotation positioning member, and the first upper rod  32  of the right side large skeleton  16  is connected to the right side of the first connecting rod  9  through a second rotation positioning member, and wherein both ends of the left side large skeleton  8  are penetrated. A first button  23  is provided in the inside of the left side large skeleton  8 . And the first button  23  is arranged in such a manner that the pair of large skeletons and the first connecting rod  9  are in a state in which relative rotation can occur when the first button  23  are pressed, and the pair of large skeletons is in a locked state with the first connecting rod  9  when the first button  23  is released; a pair of small skeletons, each small skeleton including a second upper rod and a second lower rod  18 ,  41 , wherein the second upper rod  19  of the left side small skeleton  4  is connected to the left side of the first lower rod  20  of the left side large skeleton  8  by a third rotation positioning member, and the second upper rod  42  of the right side small skeleton  17  is connected to the right side of the first lower rod  34  of the right side large skeleton  16  through a fourth rotation positioning member, and the second connecting rod  21  is fixedly connected between the second lower rod  18 ,  41  of the pair of small skeletons. Wherein both ends of the left side small skeleton  4  are penetrated. A second button  2  is provided in the inside of the left side small skeleton  4 . And the first button  23  is arranged in such a manner that the pair of small skeletons and the pair of large skeletons are in a state in which relative rotation can occur when the second button  2  are pressed, and the pair of small skeletons is in a locked state with the pair of large skeletons when the second button  2  is released. 
     The present invention uses the first button  23  to control mutual loosening and locking between the left side large skeleton  8  and the first connecting rod  9 , and the second button  2  is used to control mutual loosening and locking between the left side small skeleton  4  and the left side large skeleton  8 . Specifically, when the first button  23  is pressed, the first rotation positioning member between the left side large skeleton  8  and the first connecting rod  9 , and the second rotation positioning member between the right side large skeleton  16  and the first connecting rod  9  are operated, so that the left side large skeleton  8  and the first connecting rod  9  can be rotated relative to each other, and the right side large skeleton  16  and the first connecting rod  9  can also be rotated relative to each other and rotated to an appropriate angle; when the first button  23  is released, the first rotation positioning member between the left side large skeleton  8  and the first connecting rod  9 , and the second rotation positioning member between the right side large skeleton  16  and the first connecting rod  9  are operated, so that the left side large skeleton  8  and the first connecting rod  9  can not be rotated relative to each other, the right side large skeleton  16  and the first connecting rod  9  can also not be rotated relative to each other, and the three are locked in the current position. Similarly, the angle adjustment and locking between the left side small skeleton  4  and the left side large skeleton  8  is achieved by controlling the second button  2 , and the angle adjustment and locking process is consistent with the above process, and finally the left side small skeleton  4  and the left side large skeleton  8  to form a specific angle, and then meeting the needs of different situations. 
     In order to increase convenience for use, placing more items, the left side large skeleton  8  and the right side large skeleton  16  may also be provided with intermediate rods  29 ,  33 , respectively, and the two intermediate rods  29 ,  33  are fixedly connected to a third connecting rod  30 . A fourth connecting rod  31  is fixedly connected between the first lower rod  20  of the left side large skeleton  8  and the first lower rod  34  of the right side large skeleton  16 . 
     As shown in  FIG. 1  and  FIG. 2 , in a preferred embodiment, the towel rack with multiple usage modes, wherein the first rotation positioning member contains a first tooth formed on an inner wall of the first connecting rod  9 ; a second tooth  46  formed on an inner wall of the first upper rod  53  of the left side large skeleton  8  (as shown in  FIG. 9  and  FIG. 10 ); a first screw hole formed in the interior of the first connecting rod  9 ; a first connecting screw  24  having one end extending into the inside of the first upper rod  53  of the left side large skeleton  8  and the other end threadedly connecting to the first screw hole; a first positioning wheel  27  slidably fitted on the first connecting screw  24 , and the first positioning wheel  27  having a third tooth  47  engaging with the first tooth and the second tooth  46 , the first positioning wheel  27  abuting against the first button  23 ; a first return spring  28  sheathed on the first connecting screw  24 , one end of the first return spring connecting to the first positioning wheel  27  and the other end connecting to the inner wall of the first connecting rod  9 ; the second rotation positioning member comprising: a second screw hole formed in the interior of the first upper rod  32  of the right side large skeleton  16 ; a first limit screw  12  having one end extending into the interior of the first connecting rod  9  and the other end threadedly connecting to the second screw hole; a first cam  13  having a first end face tooth  49 , a first concave wheel  14  having a second end face tooth  51 , the first cam  13  and the first concave wheel  14  being engaged with each other, and the first cam  13  and the first concave wheel  14  slidably fitting on the first limit screw  12 , wherein the first cam  13  is provided in the first connecting rod  9 , and the first concave wheel  14  is disposed inside the first upper rod  32  of the right side large skeleton  16 ; a second return spring  15  which is sheathed on the first limit screw  12 , and has one end connecting to the first concave wheel  14  and the other end connecting to the first upper rod  32  of the right side large skeleton  16 . When the first button  23  is pressed, the first positioning wheel  27  moves in the direction of the first connecting rod  9  until separating from the second tooth  46  so that the left side large skeleton  8  and the first connecting rod  9  are in a state in which relative rotation can occur, and the first concave wheel  14  moves in the direction of the right side large skeleton  16  by the action of the first connecting rod  9  so that the first concave wheel  14  and the first cam  13  are disengaged from each other, so that the right side large skeleton  16  and the first connecting rod  9  are in a state in which relative rotation can occur. When the first button  23  is released, the first positioning wheel  27  moves in the direction of the left side large skeleton  8  by the elastic force of the first return spring  28  until it is simultaneously engaged with the first tooth and the second tooth  46 , so that the left side large skeleton  8  is in a locked state with the first connecting rod  9 , and the first concave wheel  14  moves in the direction of the first connecting rod  9  by the elastic force of the second return spring  15  until the first concave wheel  14  and the first cam  13  are engaged with each other so that the right side large skeleton  16  is in a locked state with the first connecting rod  9 . 
     In a preferred embodiment, the towel rack with multiple usage modes, the third rotation positioning member contains: a fourth tooth formed on an inner wall of the second upper rod  19  of the left side small skeleton  4 ; a fifth tooth formed on an inner wall of the first lower rod  20  of the left side large skeleton  8 ; a third screw hole formed in the interior of the second upper rod  19  of the left side small skeleton  4 ; a second connecting screw having one end extending into the inside of the first lower rod  20  of the left side large skeleton  8  and the other end threadedly connecting to the third screw hole; a second positioning wheel  6  slidably fitted on the second connecting screw  3 , and the second positioning wheel  6  having a sixth tooth engaging with the fourth tooth and the fifth tooth, the second positioning wheel  6  abuting against the second button  2 ; a third return spring  7  sheathed on the second connecting screw  3 , one end of the third return spring  7  connecting to the second positioning wheel  6  and the other end connecting to an inner wall of the first lower rod  20  of the left side large skeleton  8 ; the fourth rotation positioning member comprising: a fourth screw hole formed in the interior of the second upper rod  42  of the right side small skeleton  17 ; a second limit screw  37  having one end extending into the interior of the first lower rod  34  of the right side large skeleton  16  and the other end threadedly connecting to the fourth screw hole; a second cam  38  having a third end face tooth, a second concave wheel  39  having a fourth end face tooth, the second cam  38  and the second concave wheel  39  being engaged with each other, and the second cam  38  and the second concave wheel  39  slidably fitting on the second limit screw  37 , wherein the second cam  38  is provided in the right side large skeleton  16 , and the second concave wheel  39  is disposed inside the second upper rod  42  of the right side small skeleton  17 ; a fourth return spring  40  which is sheathed on the second limit screw  37 , and has one end connecting to the second concave wheel  39  and the other end connecting to the second upper rod  42  of the right side small skeleton  17 . When the second button  2  is pressed, the second positioning wheel  6  moves in the direction of the left side large skeleton  8  until separating from the fifth tooth so that the left side large skeleton  8  and the left side small skeleton  4  are in a state in which relative rotation can occur, and the second concave wheel  39  moves in the direction of the right side small skeleton  17  by the action of the second connecting rod  21  so that the second concave wheel  39  and the second cam  38  are disengaged from each other, so that the right side large skeleton  16  and the right side small skeleton  17  are in a state in which relative rotation can occur. When the second button  2  is released, the second positioning wheel  6  moves in the direction of the left side small skeleton  4  by the elastic force of the third return spring  7  until it is simultaneously engaged with the fourth tooth and the fifth tooth, so that the left side large skeleton  8  is in a locked state with the left side small skeleton  4 , and the second concave wheel  39  moves in the direction of the right side large skeleton  16  by the elastic force of the fourth return spring  40  until the second concave wheel  39  and the second cam  38  are engaged with each other so that the right side large skeleton  16  is in a locked state with the right side small skeleton  17 . 
     In fact, the first rotation positioning member and the third rotation positioning member have the same structure, and operation principle and operation mode are the same. The second rotation positioning member and the fourth rotation positioning member have the same structure, and operation principle and operation mode are the same. The angle adjustment process of the towel skeleton according to the present invention will be described with reference to the third rotation positioning member and the fourth rotation positioning member. 
     As shown in  FIG. 3  and  FIG. 4 , the  FIG. 3  shows a sectional view of the towel rack when the second button is pressed, and the  FIG. 4  shows a sectional view of the towel rack when the second button is released. In the  FIG. 3  and  FIG. 4 , the relative angle of the left side large skeleton  8  and the left side small skeleton  4  is 0 degree, similarly, the relative angle of the right side large skeleton  16  and the right side small skeleton  17  is also 0 degree. 
     When the second button  2  is pressed, the second button  2  urges the second positioning wheel to overcome the elastic force of the third return spring  7  and to move in the direction toward the left side large skeleton  8  so that the sixth tooth of the second positioning wheel is disengaged from the fourth tooth of the second upper rod  19  of the left side small skeleton  4 , at this time the left side small skeleton  4  and the left side large skeleton  8  are in a state in which relative rotation can occur. The second concave wheel  39  overcomes the elasticity of the fourth return spring  40  and moves in the direction toward the right side small skeleton  17  by the power transmission of the second connecting rod  21  so that the fourth end face tooth of the second concave wheel  39  and the third end face tooth of the second cam  13  are disengaged from each other, at this time the right side small skeleton  17  and the right side large skeleton  16  are in a state in which relative rotation can occur. In this embodiment, the relative angle of the left side small skeleton  4  and the left side large skeleton  8  is 0 degree, that is, the left side small skeleton  4  is rotated to open both, and the second positioning wheel rotates together with the left side large skeleton  8 . When the left side small skeleton  4  is driven, the right side small skeleton  17  is engaged with the left side small skeleton  4  by the second connecting rod  21 , and the rotation angle thereof coincides with the left side small skeleton  4 . Similarly, when the left side large skeleton  8  is rotated, the right side large skeleton  16  is engaged with the left side large skeleton  8  by the first connecting rod  9 , and the rotation angle thereof is also coincident with the left side large skeleton  8 . 
     When the second button  2  is released, the second positioning wheel moves in the direction toward the left side small skeleton  4  by the elastic force of the third return spring  7  so that the sixth tooth of the second positioning wheel is engaged again with the fourth tooth of the second upper rod  19  of the left side small skeleton  4 . When the second button  2  is completely released, the sixth tooth is completely engaged with the fourth tooth. The second positioning wheel presses the second upper rod  19  of the left side small skeleton  4  by the elastic force of the third return spring, and the left side small skeleton  4  and the left side large skeleton  8  are locked at the adjusted relative angle. By the power transmission of the second connecting rod  21 , the second concave wheel  39  moves in the direction toward the right side large skeleton  16  by the elastic force of the fourth return spring  40  so that the fourth end face tooth of the second concave wheel  39  and the third end face tooth the second cam  38  are again engaged with each other, and the right side small skeleton  17  is fixed at the adjusted relative angle. In this embodiment, the relative angle of the left side small skeleton  4  and the left side large skeleton  8  is 0 degree, and the left side small skeleton  4  and the left side large skeleton  8  are completely opened into a plane, while the right side small skeleton  17  and the right side large skeleton  16  are also fully opened on a plane. 
     It is also clear from this embodiment that the relative angle of the left side large skeleton  8  and the first connecting rod  9  can be adjusted to 0 degree by the same operation, and of course, the relative angles of the right side large skeleton  16  and the first connecting rod  9  is also 0 degree (seeing  FIG. 1  and  FIG. 2  for this status). 
     In a preferred embodiment, the towel rack with multiple usage modes, the outer circumference of the first positioning wheel  27  is annularly arranged with eight third teeth  47  (seeing  FIG. 10 ), and the outer circumference of the second positioning wheel  6  is annularly arranged with eight sixth teeth, and the right end face of the first cam  13  having eight first end face teeth  49  with an annular arrangement, the left end face of the first concave wheel  14  having eight second end face teeth  51  with an annular arrangement (seeing  FIGS. 13( a ) and 13( b ) ), the right end face of the second cam  38  having eight third end face teeth with an annular arrangement, and the right end face of the second concave wheel  39  having eight fourth end face teeth with an annular arrangement. 
     As shown in  FIG. 5 , the  FIG. 5  shows the case where the relative angle of the left side large skeleton  8  and the left side small skeleton  4  is 0 degree. The process is: when the second button  2  is pressed, the second button  2  urges the second positioning wheel to overcome the elastic force of the third return spring  7  and to move in the direction toward the left side large skeleton  8  so that the sixth tooth of the second positioning wheel is disengaged from the fourth tooth of the second upper rod  19  of the left side small skeleton  4 , at this time the left side small skeleton  4  and the left side large skeleton  8  are in a state in which relative rotation can occur. The second concave wheel  39  overcomes the elasticity of the fourth return spring  40  and moves in the direction toward the right side small skeleton  17  by the power transmission of the second connecting rod  21  so that the fourth end face tooth of the second concave wheel  39  and the third end face tooth of the second cam  38  are disengaged from each other, at this time the right side small skeleton  17  and the right side large skeleton  16  are in a state in which relative rotation can occur. At this time, adjusting the left side small skeleton  4  to desired angle. In this embodiment, the relative angle of the left side small skeleton  4  and the left side large skeleton  8  is 90 degrees, that is, the left side small skeleton  4  is rotated so that the relative angle between the two is 90 degrees. 
     Since the fourth tooth of the left side small skeleton  4  and the sixth tooth of the second positioning wheel have eight, each engaging one tooth, the relative angle is 45 degrees, so that the left side small skeleton  4  is rotated by an angle of two the fourth tooth, and the relative angle of the left side large skeleton  8  and the left side small skeleton  4  can be reached 90 degrees. At this time, the second positioning wheel rotates together with the left side large skeleton  8 . 
     When the second button  2  is released, the second positioning wheel moves in the direction toward the left side small skeleton  4  by the elastic force of the third return spring  7  so that the sixth tooth of the second positioning wheel is engaged again with the fourth tooth of the second upper rod  19  of the left side small skeleton  4 . When the second button  2  is completely released, the sixth tooth is completely engaged with the fourth tooth. The second positioning wheel presses the second upper rod  19  of the left side small skeleton  4  by the elastic force of the third return spring  7 , and the left side small skeleton  4  and the left side large skeleton  8  are locked at the adjusted relative angle. By the power transmission of the second connecting rod  21 , the second concave wheel  39   14  moves in the direction toward the right side large skeleton  16  by the elastic force of the fourth return spring  40  so that the fourth end face tooth of the second concave wheel  39  and the third end face tooth the second cam  38  are again engaged with each other, and the right side small skeleton  17  is fixed at the adjusted relative angle. In this embodiment, the relative angle of the left side small skeleton  4  and the left side large skeleton  8  is 90 degrees, and the left side small skeleton  4  and the left side large skeleton  8  are locked at positions where the relative angle is 90 degrees. Similarly, the left side large skeleton  8  and the first connecting rod  9  are also locked at positions where the relative angle is 0 degree. 
     As shown in  FIG. 6 , when the second button is pressed, the left side large skeleton  8  and the left side small skeleton  4  are in a state in which relative rotation can occur, rotating the left side small skeleton  4  by an angle of one the fourth tooth so that the relative angle of the left side large skeleton  8  and the left side small skeleton  4  is 45 degrees. Similarly, when the first button  23  is pressed, the left side large skeleton  8  and the first connecting rod  9  are in a state in which relative rotation can occur, rotating the left side large skeleton  8  by an angle of one the second tooth  46  so that the relative angle of the left side large skeleton  8  and the first connecting rod  9  is 45 degrees. 
     As shown in  FIG. 7 , when the first button  23  is pressed, the left side large skeleton  8  and the first connecting rod  9  are in a state in which relative rotation can occur, rotating the left side large skeleton  8  by an angle of two the second tooth  46  so that the relative angle of the left side large skeleton  8  and the first connecting rod  9  is 90 degrees. 
     As shown in  FIG. 13( a )  and  FIG. 13( b ) , in a preferred embodiment, the towel rack with multiple usage modes, the left end face of the first cam  13  has four annularly arranged first convex feet  50 , the left end face of the second cam  38  has four annularly arranged second convex feet  52 , the right end face of the first concave wheel  14  has four annularly arranged third convex feet, and the right end face of the second concave wheel  39  has four annularly arranged fourth convex feet; the interior of the first connecting rod  9  having four annularly arranged first grooves, the interior of the first upper rod  32  of the right side large skeleton  16  having four annularly arranged second grooves, the interior of the first lower rod  34  of the right side large skeleton  16  having four annularly arranged third grooves, the interior of the second upper rod  42  of the right side small skeleton  17  having four annularly arranged fourth grooves; wherein the first convex feet  50  and the first grooves are fixed to each other, the second convex feet  52  and the second grooves are fixed to each other, the third convex feet and the third grooves are fixed to each other, and the fourth convex feet and the fourth grooves are fixed to each other. 
     The present embodiment can prevent the first cam  13  rotating freely with respect to the first connecting rod  9 , prevent the first concave wheel  14  rotating freely with respect to the right side large skeleton  16 , prevent the second cam  38  rotating freely with respect to the right side large skeleton  16 , and prevent the second concave wheel  39  rotating freely with respect to the right side small skeleton  17 . The present embodiment contributes to improvement of stability of the towel frame structure. 
     As shown in  FIG. 8  and  FIG. 9 , in a preferred embodiment, the towel rack with multiple usage modes, the first button  23  includes a first body  23  and four fifth convex feet  43  connected to the right side of the first body  23 , and when the first button  23  is pressed, the fifth convex feet  43  slides along a through groove opened on the inside of the left side large skeleton  8 , and the fifth convex feet  43  abutting against the first positioning wheel  27 , the second button  2  including a second body and four sixth convex feet connected to the right side of the second body, and when the second button  2  is pressed, the sixth convex feet slides along a through groove opened on the inside of the left side small skeleton  4 , and the sixth convex feet abutting against the second positioning wheel  6 . 
     When the first button  23  is pressed, the first button  23  pushes the first positioning wheel  27  through the fifth convex feet  43  and the first button  23  moves toward the first connecting rod  9 , the fifth convex feet  43  sliding along the through groove  45  opened on the inside of the left side large skeleton  8 , which can prevent the first button  23  rotating freely and affect adjustment of the relative angles of the left side large skeleton  8  and the first connecting rod  9 , and also improve stability of the towel frame structure. Similarly, When the second button  2  is pressed, the second button  2  pushes the second positioning wheel  6  through the sixth convex feet and the second button  2  moves toward the left side large skeleton  8 , the sixth convex feet sliding along the through groove opened on the inside of the left side small skeleton  4 , which can prevent the second button  2  rotating freely and also improve stability of the towel frame structure. 
     As shown in  FIG. 1  to  FIG. 4 , in a preferred embodiment, the towel rack with multiple usage modes, also contains: a first nut  22  provided at the left end of the first upper rod  53  of the left side large skeleton  8  for stopping the first button  23 , a second nut  1  provided at the left end of the second upper rod  19  of the left side small skeleton  4  for stopping the second button  2 . That is, the first nut  22  is sheathed at the head of the first button  23 , and the first nut  22  can prevent the first button  23  from coming off when the first button  23  is reset by the action of the first return spring  28 . When the first button  23  needs to be operated, an intermediate screw hole of the first nut  22  can be realized. 
     As shown in  FIG. 3 ,  FIG. 4  and  FIG. 12 , in a preferred embodiment, the towel rack with multiple usage modes, the first limit screw  12  is sheathed with a first opening gasket  10  opening a first arcuate groove  48 , the opening direction of the first arcuate groove  48  being directed toward the left, a first fastening bolt  11  being connected to the first upper rod  32  of the right side large skeleton  16  and passing upwardly through the first arcuate groove  48 ; the second limit screw  37  being sheathed with a second opening gasket  35  opening a second arcuate groove, the opening direction of the second arcuate groove being directed toward the left, a second fastening bolt  36  being connected to the second upper rod  42  of the right side small skeleton  17  and passing upwardly through the second arcuate groove. 
     Wherein the first fastening bolt  11  is connected to the right side large skeleton  16  and passes through the first arcuate groove  48  of the first opening gasket  10 , that is, the first fastening bolt  11  is stopped of the closed end of the first arcuate groove  48 , and ensure that the right side large skeleton  16  can not be separated from the first connecting rod  9 . The second fastening bolt  36  is connected to the right side small skeleton  17  and passes through the second arcuate groove of the second opening gasket  35 , that is, the second fastening bolt  36  is stopped of the closed end of the second arcuate groove, and ensure that the right side small skeleton  17  can not be separated from the right side large skeleton  16 . 
     In addition,  FIG. 11  also shows a structural view of the first opening bush  26 . The first opening bush  26  is provided between the first upper rod  53  of the left side large skeleton  8  and the first connecting rod  9 . The second opening bush  5  is provided between the second upper rod  19  of the left side small skeleton  4  and the second lower rod  20  of the left side large skeleton  8 . 
     In a preferred embodiment, the towel rack with multiple usage modes, the left side large skeleton  8 , the left side small skeleton  4 , the right side large skeleton  16 , and the right side small skeleton  17  are integrally formed. Although the embodiments of the present invention have been disclosed above, they are not limited to the applications previously mentioned in the specification and embodiments, and can be applied in various fields suitable for the present invention. For ordinary skilled person in the field, other various changed model, formula and parameter may be easily achieved without creative work according to instruction of the present invention, changed, modified and replaced embodiments without departing the general concept defined by the claims and their equivalent are still included in the present invention. The present invention is not limited to particular details and illustrations shown and described herein.