Patent Publication Number: US-2021180601-A1

Title: Double-shaft foldable hand-held fan

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Chinese Patent Application No. 201922218810.5 with a filing date of Dec. 11, 2019. The content of the aforementioned application, including any intervening amendments thereto, are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present utility model relates to a foldable hand-held fan, and in particular to a double-shaft foldable hand-held fan. 
     BACKGROUND 
     Currently, with increasing improvement of living standards, consumers have urgent needs to relieve outdoor heat in summer. A type of portable and foldable hand-held fan appears in the market. The fan is designed with a single rotary shaft structure at a handle so that he handle may be folded 180 degrees when the fan is carried outside. Therefore, the fan has a more regular overall shape and a smaller occupation area. In this way, it is convenient for the consumers to store and carry. 
     At present, the above single-shaft foldable fan mainly has the following problems and defects. 
     1) Due to the single-shaft structure, the single shaft structure is required to protrude from a shell of the fan to fold the fan 180 degrees. In this case, a contour of the product is extremely complex and irregular, greatly lowering aesthetics; further, the fan may extremely easily hide dusts and dirts during use and is inconvenient to clean. 
     2) Due to a large impact on circuit design, the single shaft structure has to be hollowed locally to help an electric wire to pass through the rotary shaft. As a result, there will be a case that the electric wire is exposed at the rotary shaft of the product, which will not only affect the aesthetics but also increase the risk of breakage of the electric wire due to external force. 
     3) For the single-shaft folding structure, the electric wire is required to be folded 180 degrees together with the handle in a folding process. Therefore, a folding aging problem of the electric wire becomes serious and the electric wire is easily failed due to breakage after slightly more folding times. 
     4) A connection part of the single-shaft structure is integrated with the shell (a fan head or a fan handle) of the product and thus cannot be treated for separate material reinforcement. Therefore, a structural strength at the rotary shaft of the product is very weak. The rotary shaft may be easily subjected to structural breakage after receiving an acting force which is not in a design direction of the rotary shaft, thereby scrapping the product. 
     SUMMARY 
     To overcome the above shortcomings of the prior art, the present utility model provides a double-shaft foldable hand-held fan, which, after being folded, is beautiful, regular, simple and easy to carry, and may avoid hiding dust and dirt, and its connecting piece has stronger abrasion resistance and strength. 
     To solve the above technical problem, the present utility model adopts the following technical solution: the fan includes a fan head and a fan handle which are rotatably connected up and down, an independent double-shaft structure which is entirely “capsule-shaped” is provided between the fan head and the fan handle, the double-shaft structure is mainly formed by a “runway-shaped” shaft seat and two rotary shafts, and the two rotary shafts are fixed at both ends of an inner cavity of the “runway-shaped” shaft seat respectively, where a rotary shaft I located at an upper end is connected with the fan head, and a rotary shaft II located at a lower end is connected with the fan handle, and the two rotary shafts are disposed at the sides of back surfaces of the fan head and the fan handle at the same time. 
     Compared with the prior art, the double-shaft foldable hand-held fan of the present utility model is realized as follows: an entirely “capsule-shaped” double-shaft structure is provided between the fan head and the fan handle, and the double-shaft structure is mainly formed by the “runway-shaped” shaft seat and two rotary shafts, and the two rotary shafts are fixed at both ends of the inner cavity of the “runway-shaped” shaft seat respectively, the rotary shaft I located at the upper end is connected with the fan head, and the rotary shaft II located at the lower end is connected with the fan handle, and thus the two rotary shafts both rotate 90 degrees oppositely to fold the entire fan 180 degrees. Further, since two rotary shafts are disposed at the sides of back surfaces of the fan head and the fan handle at the same time, the double-shaft structure is entirely embedded between the fan head and the fan handle without a protruding structure. In this case, the appearance of the product is simpler and more regular, and the problem of hiding dust and dirt can be avoided. In addition, the double-shaft structure of the present utility model is a separate component independent of the fan head and the fan handle, and serves only as a connecting piece of the fan head and the fan handle. As a result, separate material reinforcement is facilitated so that the double-shaft structure itself has stronger abrasion resistance and strength. At the same time, the electric wire between the fan head and the fan handle may be run in the inner cavity of the “runway-shaped” shaft seat to prevent the electric wire from being damaged to some extent. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present utility model will be further described below in combination with accompanying drawings and examples. 
         FIG. 1 a   ,  FIG. 1 b   , and  FIG. 1 c    are three-dimensional views of a folding process of an example of the present utility model. 
         FIG. 2 a   ,  FIG. 2 b    and  FIG. 2 c    are side views of a folding process of an example of the present utility model. 
         FIG. 3  is a schematic diagram of running wires according to an example of the present utility model. 
     
    
    
     Numerals of the drawings are described as follows:  1 . a fan head,  1 - 1 . a plug,  2 . a double-shaft structure,  2 - 1 . a rotary shaft I,  2 - 2 . a “runway-shaped” shaft seat,  2 - 3 . a rotary shaft II,  3 . a fan handle,  3 - 1 . a socket,  4 . a motor,  5 . an electric wire,  6 . a circuit board, and  7 . a battery. 
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     To understand the objects, technical solutions and advantages of the present utility model more clearly, the technical solutions in examples of the present utility model will be described clearly and fully below in combination with accompanying drawings in the examples of the present utility model. It is apparent that the described examples are merely part of examples of the present utility model rather than all examples. Other examples achieved by those of ordinary skill in the art based on the examples in the present utility model without paying creative work shall all fall into the scope of protection of the present utility model. 
       FIG. 1  and  FIG. 2  are schematic diagrams illustrating a structure of a preferred example of the present utility model. A double-shaft foldable hand-held fan in the drawings includes a fan head  1  and a fan handle  3  which are rotatably connected up and down. Usually, a surface of the fan head  1  facing a user is a front surface, and a surface opposite to the front surface is a back surface. The fan head  1  generally includes a fan blade, a fan cover and a motor  4 . The motor  4  is located in a middle part of the fan blades to drive the fan blades to rotate. The fan blades are disposed within a cavity formed by a pair of fan covers. To facilitate connection, a short rod part is provided at a lower end of the fan cover. Further, the fan handle  3  also has a front surface and a back surface which are in the directions of the front surface and the back surface of the fan head  1 . An operation switch or a control knob, or the like is usually disposed on the front surface of the fan handle  3 . A main body of the fan handle  3  is a closed cavity formed by cover plates and buckles, and the cavity may also be divided according to space to receive a battery  7  and a circuit board  6 . 
     As shown in  FIG. 1  and  FIG. 2 , in this example, an independent and entirely “capsule-shaped” double-shaft structure  2  is provided between the fan head  1  and the fan handle  3 , the double-shaft structure  2  is mainly formed by a “runway-shaped” shaft seat  2 - 2  and two rotary shafts, and the two rotary shafts are fixed at both ends of an inner cavity of the “runway-shaped” shaft seat  2 - 2  respectively, where a rotary shaft I  2 - 1  located at an upper end is connected with the fan head  1 , and a rotary shaft II  2 - 3  located at a lower end is connected with the fan handle  3 , and the two rotary shafts are disposed at the sides of the back surfaces of the fan head  1  and the fan handle  3  at the same time. 
     This example is further improved as follows: a plug  1 - 1  and a socket  3 - 1  are provided at the front surfaces of the fan head  1  and the fan handle  3  respectively to achieve cooperation. That is, engageable components are provided at a lower end of the short rod part of the fan head  1  and a top end of the front surface of the fan handle  3  respectively to realize firmer positioning when the fan head  1  and the fan handle  3  are engaged, and disengagement may be achieved by slightly applying a force when it is desired to fold the fan. 
     Further, a groove may be opened at corresponding positions of the back surfaces of the fan head  1  and the fan handle  3  respectively. A mounting hole is provided at both inner sides of the groove, and both ends of the double-shaft structure  2  are disposed within the grooves and connected to a hollow rotary shaft through the mounting holes. The grooves enable the double-shaft structure  2  to be more tightly connected with the fan head  1  and the fan handle  3 , thereby saving space and bringing a better folding effect. 
     As shown in  FIG. 3 , a further optimized design solution may be obtained as follows: the rotary shaft I  2 - 1  and the rotary shaft II  2 - 3  are both hollow rotary shafts, and an electric wire  5  between the fan head  1  and the fan handle  3  is run within shaft holes of the hollow rotary shafts. More preferably, the electric wire  5  runs into the shaft hole of the hollow rotary shaft located at the upper end, and runs out of the shaft hole of the hollow rotary shaft located at the lower end of the same side to connect the motor  4  within the upper fan head  1  with the battery  7  within the lower fan handle  3 . When a circuit board  6  exists, the electric wire  5  is also connected to the circuit board  6  within the fan handle  3 . With such in-shaft wire running manner, the electric wire  5  will not be exposed nor damaged by contact of an external force. The electric wire  5  is rotated and twisted 90 degrees respectively at different positions in two segments. In this case, the electric wire  5  has stronger aging resistance compared with the case that the electric wire  5  is folded 180 degrees at one position. Thus, the case that the electric wire  5  is broken due to excessive folding times can be basically avoided. 
     A preferred solution of a material is as follows: the double-shaft structure  2  is made with a reinforced material of PC plastic and 30 GF %, or made with a reinforced material of PPS resin. Therefore, the double-shaft structure  2  has better abrasion resistance and strength. 
     The above descriptions are merely preferred examples of the present utility model but not intended to limit the present utility model in any form, and any simple modifications and equivalent substitutions made to the above examples based on the technical essence of the present utility model shall all be encompassed in the scope of protection of the present utility model.