Abstract:
A rotational structure applied to a rotational mop set is provided. The rotational structure comprises a rotating body, a rotating unit, and at least a pawl unit. The rotating body has at least a stopper. The rotating unit is rotatably assembled to the rotating body, and has a through hole. A spiral bar penetrates the through hole for driving the rotating unit along a first rotating direction or a second rotating direction. The pawl unit is corresponded to the stopper and rotatably assembled to the rotating unit for engaging with the stopper when the rotating unit rotates along the first rotating direction to drive the rotating body to rotate along the first rotating direction, and the pawl unit escapes from the stopper when the rotating unit rotates along the second rotating direction.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a rotational structure, and more particularly relates to a rotational structure assembled to a rotational mop, which has a pawl unit engaging with a stopper for driving the mop. 
     BACKGROUND OF THE INVENTION 
     The mop is a broadly used cleaning equipment for cleaning the floor of various occasions and has become a demanded tool for every families. For the traditional mop, the user needs to squeeze the mop with both hands to achieve the object of removing excess water on the mop cloth. However, such operation is inconvenient for the user and the effect of extracting water is limited. 
     To enhance convenience of environmental cleaning, the traditional mop, which is composed of a handle and a mop head mounted to the end of the handle, has gradually been replaced by the rotational mop and a respective drying bucket. However, the rotational mop still has some drawbacks to be resolved. 
     In the traditional rotational mop, the purpose of spin drying is achieved through the linkage of gears. For example, the mop structure disclosed in R.O.C Patent No. M424118 has a rack on the inner wall of the outer bar and a driving gear set engaged with the rack and the inner bar. The inner bar is rotated through the engagement of the first gear portion, the second gear portion, and the third gear portion of the driving gear set and the rack to drive the mop plate so as to achieve the object of spin drying. 
     The mop structure disclosed in R.O.C Patent No. M378721 has a main gear assembled to a stationary base, the main gear has a bar assembled thereon. An upper idle gear and a lower idle gear are engaged with the main gear. The lower idle gear is connected to a shaft. To use the mop structure is used, the bar is rotated to drive the main gear. The rotation of the main gear drives the lower idle gear to generate a horizontal rotation to have the mop plate seat and the mop plate body rotated along the same direction through the shaft. Thereby, a centrifugal force is generated to remove the water on the mop cloth so as to achieve the object of spin drying. 
     The above mentioned rotational mop structures achieve the object of spin dry through the usage of gears to transfer rotational power, however, the engagement between the gears might not be perfect to leave some gaps between the gears. Thus, when using the above mentioned rotational mop, the gaps between the gears may delay rotation transfer and result in a feeling of discomfort when gear teeth collide to another gear. In addition, the conditions of jump teeth or off teeth are common when using the gears to drive the mop, which may shorten the lifetime of the mop. 
     BRIEF SUMMARY OF INVENTION 
     In view of the prior art, the gaps between the gears may result in a feeling of discomfort and the problems of jump teeth or off teeth easily. Accordingly, it is a main object of the present invention to provide a rotational structure assembled to a rotational mop and features a pawl structure engaging with a stopper for driving the mop to achieve the effect of spin drying. 
     Accordingly to the above object, a rotational structure is provided in accordance with an embodiment of the present invention. The rotational structure is applied to a rotational mop set, which includes a rotational mop and a dryer, and the rotational structure is utilized to be assembled in the rotational mop. The rotational structure comprises a rotating body, a rotating unit, and at least a pawl unit. The rotating body has at least a stopper. The rotating unit is rotatably assembled to the rotating body, and has a through hole. A spiral bar penetrates the through hole for driving the rotating unit along a direction selected from a group consisting of a first rotating direction and a second rotating direction. The pawl unit is corresponded to the stopper and rotatably assembled to the rotating unit for engaging with the stopper when the rotating unit rotates along the first rotating direction to drive the rotating body to rotate along the first rotating direction so as to remove water in the dryer, and the pawl unit escapes from the stopper when the rotating unit rotates along the second rotating direction. 
     Because the rotational structure provided in accordance with the embodiment of the present invention achieves the effect of spin drying by using the spiral bar to drive the rotating unit to have the pawl unit engaging with the stopper by the generated centrifugal force so as to drive the mop to rotate, the gear set is not needed and thus the shortcomings of prior art would not exist. 
     In addition, according to an embodiment of the present invention, the rotating body is a cylinder with an empty interior, the stopper is assembled to an inner wall of the rotating body, and the stopper is a ratchet tooth. Moreover, the rotating unit is located in the rotating body and has at least an accommodating portion for locating the pawl unit. The accommodating portion has at least a connecting hole, and the pawl unit has a connecting portion and a pawl portion, the connecting portion is rotatably connected to the connecting hole, when the rotating unit rotates along the first rotating direction to drive the connecting portion to rotate to have the pawl portion engaging with the stopper. 
     In addition, according to an embodiment of the present invention, the rotational mop includes a handling bar structure, and the spiral bar is located in the handling bar structure. When the handling bar structure moves along a first moving direction, the spiral bar moves along the first moving direction to drive the rotating unit rotates along the first rotating direction. When the handling bar structure moves along a second moving direction, the spiral bar moves along the second moving direction to drive the rotating unit rotates along the second rotating direction. In addition, the through hole has a plurality of spiraling grooves corresponded to threads of the spiral bar. 
     In addition, according to an embodiment of the present invention, the rotational mop further includes a rotating tube, which is connected to the handling bar structure through a coupling unit, the rotating tube is connected to the rotating body such that when the rotating unit rotates along the first rotating direction to drive the rotating body rotates along the first rotating direction, the rotating body also drives the rotating tube rotates along the first rotating direction. In addition, the rotating body is located at an upper end of the rotating tube and coupled to the rotating tube, and the rotational mop further includes a mop plate connected to the rotating tube such that when the rotating tube rotates along the first rotating direction, the mop plate is driven by the rotating tube to rotate along the first rotating direction. 
     The embodiments adopted in the present invention would be further discussed by using the flowing paragraph and the figures for a better understanding. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a 3D schematic view showing a rotational mop set in accordance with a preferred embodiment of the present invention. 
         FIG. 2  is an explosive view showing a rotational mop in accordance with a preferred embodiment of the present invention. 
         FIG. 3  is a schematic cross section view showing a rotational structure in accordance with a preferred embodiment of the present invention assembled to a rotating tube. 
         FIG. 4  is a schematic explosive view showing a rotational structure in accordance with a preferred embodiment of the present invention. 
         FIG. 5  is a schematic view showing a rotational structure rotating along the first rotating direction in accordance with a preferred embodiment of the present invention. 
         FIG. 5A  is a schematic view showing a rotational structure rotating along the second rotating direction in accordance with a preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     There are various embodiments of the rotational structure in accordance with the present invention, which are not repeated hereby. The preferred embodiment is mentioned in the following paragraph as an example. It should be understood by those skilled in the art that the preferred embodiments disclosed in the following paragraph are merely an example instead of restricting the scope of the invention itself. 
     Refer to  FIGS. 1 to 4 , wherein  FIG. 1  is a 3D schematic view showing a rotational mop set in accordance with a preferred embodiment of the present invention,  FIG. 2  is an explosive view showing a rotational mop in accordance with a preferred embodiment of the present invention,  FIG. 3  is a schematic cross section view showing a rotational structure in accordance with a preferred embodiment of the present invention assembled to a rotating tube, and  FIG. 4  is a schematic explosive view showing a rotational structure in accordance with a preferred embodiment of the present invention. 
     As shown, the rotational structure provided in the present invention is applicable to a rotational mop set  100 , which includes a rotational mop  2  and a dryer  3 , and the rotational structure  1  is assembled in the rotational mop  2 . The rotational structure  1  includes a rotating body  11 , a rotating unit  12 , two pawl units  13 , and a cover  14 . 
     The rotating body  11  has a plurality of stoppers  111  (only one of them is labeled). As a preferred embodiment, eight stoppers  111  may be used. However, the present invention is not so restricted. According to the need, the rotating body  11  may have only one stopper  111 . Concretely speaking, the rotating body  11  is a cylinder with an empty interior, the stopper  111  is assembled to an inner wall of the upper end of the rotating body  11 , and the stopper  111  is a ratchet tooth, which shows a structure with a contour gradually protruded from the inner wall of the upper end of the rotating body  11  toward the interior. That is, the thickness of the rotating body varies gradually along the circumferential direction. However, the present invention is not so restricted. 
     The rotating unit  12  is rotatably assembled to the rotating body  11  and has a through hole  121 . In addition, the through hole  121  has a plurality of spiraling grooves  1211  on the sidewall. Concretely speaking, the rotating unit  12  is totally located in the rotating body  11 . However, the present invention is not so restricted. In other embodiments, the rotating unit  12  may be partially located in the rotating body  11 . The rotating unit  12  also has two accommodating portions  122  (only one of them is labeled). In the present embodiment, the accommodating portions  122  are formed at the upper end of the rotating unit  12  to simplify the fabrication process, each of the accommodating portions  122  has a connecting hole  1221 , and the accommodating portion  122  is shaped as a trench. However, the present invention is not so restricted. In other embodiments, the accommodating portions  122  may be formed at the middle or the lower end of the rotating unit  12  according to the need. 
     Two pawl units  13  are corresponded to the stopper  111  and rotatably connected to the rotating unit  12 . Concretely speaking, in the present embodiment, the pawl unit  13  is shaped as a water drop. Referring to  FIG. 5 , the pawl unit  13  has a greater width near the junction to the rotating unit  12  and a smallest width at the top from the top view. In addition, the pawl unit  13  has a connecting portion  131  and a pawl portion  132 , the connecting portion  131  is rotatably connected to the connecting hole  1221  to have the pawl unit  13  located in the accommodating portion  122 . 
     It is noted that, in accordance with a preferred embodiment of the present invention, the accommodating portions  122  has a shape identical to the pawl unit  13 , and the pawl unit  13  rotates centered at the connecting portion  131  to have the pawl portion  132  move toward the inner wall of the rotating body  11 . In addition, the connecting portion  131  and the pawl portion  132  may be fabricated by using the material with higher stiffness to extend lifetime. The connecting means for connecting the connecting portion  131  to the connecting hole  1221  are well known to the skilled, which are not repeated here. In addition, the cover  14  is assembled on the rotating unit  12  and the pawl unit  13  to enhance structure steadiness. 
     The rotational mop  2  includes a handling bar structure  21 , a coupling unit  22 , a rotating tube  23 , a spiral bar  24 , and a mop plate  25 . The handling bar structure  21  is utilized to be handled by the user, and it can move along a first moving direction D1 and a second moving direction D2. The coupling unit  22  is connected to the handling bar structure  21  and the rotating tube  23 , and the rotating tube is connected to the rotating body  11 . In addition, the rotating body  11  is located at the upper end of the rotating tube  23 . However, the present invention should not be so restricted, and the rotating body may have different arrangements according to the need. 
     The spiral bar  24  is a screw bar for example, which is located in the handling bar structure  21  and the rotating tube  23 . Concretely speaking, the spiral bar  24  is assembled in the through hole  121  and the threads of the spiral bar  24  match the spiraling grooves  1211  of the through hole  121 . In addition, the spiral bar  24  is capable to move along the first moving direction D1 and the second moving direction D2. Through the engagement of the spiral bar  24  and the spiraling grooves  1211 , the spiral bar  24  is able to drive the rotating unit  12  to rotate along a rotating direction selected from a first rotating direction S1 (labeled in  FIG. 5 ) and a second rotating direction S2 (labeled in  FIG. 5A ). The mop plate  25  is connected to the rotating bar  23 , and the dryer  3  may be a drying bucket with or without a foot pedal. 
     Please also refer to  FIG. 1 ,  FIG. 4 ,  FIG. 5  and  FIG. 5A , wherein  FIG. 5  is a schematic view showing a rotational structure rotating along the first rotating direction in accordance with a preferred embodiment of the present invention and  FIG. 5A  is a schematic view showing a rotational structure rotating along the second rotating direction in accordance with a preferred embodiment of the present invention. As shown, as the user wants to dry the rotational mop, he may place the rotational mop  2  on the drying basket (not shown) of the dryer  3 , then, by pushing the handling bar structure  21  to have the handling bar structure  21  move downward along the first moving direction D1, the spiral bar  24  also moves downward along the first moving direction D1 in the through hole  121  to drive the rotating unit  12  to rotate along the first rotating direction S1. 
     Meanwhile, as the rotating unit  12  rotates along the first rotating direction S1, the connecting portion  131  rotates with respect to the connecting hole  1221  due to the generated centrifugal force (or can be understood as the inertia effect) so as to have the pawl portion  132  moves toward the inner wall of the rotating body  11  to engage with the stopper  111  to stop the pawl unit  13 . At the same time, the user keeps pushing the handling bar structure  21  downward along the first moving direction D1 to have the rotating unit  12  continuously rotate along the first rotating direction S1. Since the pawl unit  13  is engaged with the stopper  111 , the rotating body  11  would be driven to rotate along the first rotating direction synchronously. 
     When the rotating body rotates along the first rotating direction S1, the rotating tube  23  is driven to rotate along the first rotating direction S1 synchronously and so is the mop plate  25 . At this time, the drying basket of the dryer  3  is capable to remove the water on the mop plate  25  through the rotation of the mop plate  25  along the first rotating direction S1 to achieve the effect of spin drying in the dryer  3 . 
     After pushing the handling bar structure  21  downward to the bottom, the user may pull the handling bar structure  21  upward to have the handling bar structure  21  move along the second moving direction D2. Then, the spiral bar  24  moves along the second moving direction D2 in the through hole  121  to drive the rotating unit  12  rotatably along the second rotating direction S2. At this time, the pawl unit  13  would escape from the stopper  111  and return to its original position because of the influence of the centrifugal force (or can be understood as the inertia effect). Therefore, the user may have the handling bar structure  21  move along the first moving direction D1 and the second moving direction D2 repeatedly to remove the water on the mop plate thoroughly. 
     In conclusion, the rotational structure  1  provided in the present invention uses the spiral bar  24  to rotate the rotating unit  12  and has the pawl unit  13  engages with the stopper  111  through the generated centrifugal force so as to drive the mop plate  25  to achieve the effect of spin drying. Thus, the gear set is not needed and the problem mentioned in the prior art would not exist. 
     The detail description of the aforementioned preferred embodiments is for clarifying the feature and the spirit of the present invention. The present invention should not be limited by any of the exemplary embodiments described herein, but should be defined only in accordance with the following claims and their equivalents. Specifically, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims.