Patent Publication Number: US-2006010695-A1

Title: Handle structure of scissors

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention is related to a handle structure of scissors and particularly to a handle structure of scissors, in which the ring handle parts can be turned to keep the hand holding the scissors unmoved in spite of the scissors changing positions.  
      2. Brief Description of Related Art  
      The conventional structure of scissors shown in  FIGS. 1 and 2  mostly is provided with two symmetrical blades  11  integrated with a handle stem  12  and a ring handle part  13  respectively. The fingers  1  are inserted through the ring handle parts  13  to keep contact with the handle stems  12 . Further, one of the ring handle parts  13  is provided with a handle tail  14  being contacted with a further finger  1 . The preceding conventional structure scissors has the following shortcomings:  
      1. When the blades  11  are disposed upwards, the handle stems  12  and the ring handle parts  13  are disposed downwards as shown in  FIG. 3A . When the blades  11  are disposed horizontally, the handle stems  12  and the ring handle parts  13  are disposed horizontally too as shown in  FIG. 3B . When the blades  11  is disposed toward downward, the handle stems  12  and the ring handle parts  13  are disposed upwards as shown in  FIG. 3C . Hence, the fingers  1 , the palm  2  and the elbow  3  has to move corresponding to different positions of the scissors shown in  FIGS. 3A, 3B  and  3 C. Especially, the elbow  3  has to be lifted upwards for the positions shown in  FIGS. 3B and 3C  and it is not comfortable from standpoint of human engineering. As a result, the elbow  3  is easy to become fatigued and even get hurt to such as muscle or tendon.  
      2. Due to the ring handle parts  13  being integral with the handle stems and the blades, the ring handle parts  13  are incapable of performing angular adjustment and it is very inconvenient that the fingers  1 , the palm  2  and the elbow  3  have to change the angular positions thereof in order to comply with position changes of the scissors.  
     SUMMARY OF THE INVENTION  
      A main object of the present invention is to provide a handle structure of scissors with which the ring handle parts are detachably joined to the handle stems so that the fingers, the palm and the elbow can be kept unmoved during the ring handle parts being rotated to change angular positions with respect the handle stems for cutting purpose and an easy operation can be obtained effectively according to the human engineering.  
      Another object of the present invention is to provide a handle structure of scissors in which the ring handle parts are assembled to the handle stems in company with a projection seat, an axial hole, an engaging bolt, rubber washers and an O shaped rubber ring so that the ring handle parts can be kept at an angular position with respect to the handle stem unless the ring handle parts are forced to rotate to another angular position. 
    
    
     BRIEFE DESCRIPTION OF THE DRAWINGS  
      The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which:  
       FIG. 1  is a perspective view of a conventional scissors;  
       FIG. 2  is a plan view of the scissors shown in  FIG. 1  illustrating being held with fingers;  
       FIG. 3A  is a plan view illustrating the scissors in a state of using for cutting hairs with the blades thereof being disposed upwards;  
       FIG. 3B  is plan view illustrating the scissors in a state of using for cutting hairs with the blades thereof being disposed horizontally;  
       FIG. 3C  plan view illustrating the scissors in a state of using for cutting hairs with the blades thereof being disposed downwards;  
       FIG. 4  is a partly exploded perspective view of scissors according to the present invention;  
       FIG. 5  is a sectional view of an annular handle part of the scissors according to the present invention;  
       FIG. 6  is a perspective view of the scissors according to the present invention illustrating the annular handle part being assembled completely;  
       FIG. 7  is a perspective view illustrating the annular handle part being capable of being rotated an angle with respect to the main body of the scissors; and  
       FIG. 8A  is a plan view illustrating the annular handle part being rotated in a state of the blades being disposed upwards;  
       FIG. 8B  is a plan view illustrating the annular handle part being rotated in a state of the blades being disposed horizontally; and  
       FIG. 8C  is a plan view illustrating the annular handle part being rotated in a state of the blades being disposed downwards. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      Referring to  FIGS. 4 and 5 , a handle structure of scissors  20  of the present invention basically has two blades joined pivotally to each other with an elongated stem  22  extending rearward respectively. The elongated stem  22  at the rear end thereof has an axial hole  23 . A ring handle part  30  is attached to the rear end of the elongated stem  22 . The ring handle part  30  has a projection seat  31  with a square engaging hole  310 . An extension end  32 ,  33  is formed at two ends of the projection seat  31  respectively. The axial hole  23  can be passed through with an engaging bolt  24  for engaging the ring handle part  30  to the elongated stem  22 . An O shaped soft ring  35  is disposed between the elongated stem  22  and the projection seat  31 . The engaging bolt  24  is provided with a square end so as to be inserted to and pass through the square engaging hole  310  for being fastened with a nut  34 . Hence, the elongated stem  22  can be secured with the ring handle part  30  and the engaging bolt  24  is kept unmoved while the nut  34  is rotated. Thus, the ring handle part  24  can be turned to and retain at an angular position with respect to the elongated stem  22  due to elasticity and friction of the O ring  35 . Further, washers  25  can be arranged between the head of the engaging bolt  24  and the axial hole  24  to enhance the elasticity and the friction such that preferable effect for turning and locating the ring handle part  30  can be obtained substantially.  
      Referring to  FIG. 6 , the ring handle part  30  can be disposed at a normal position without angular displacement with respect to the elongated stem  22  as shown in  FIG. 6  after being assembled to the elongated stem  22 . Referring to  FIG. 7 , the ring handle part  30  can be adjusted to have any angular positions with respect to the elongated stem  22 . As forgoing, the ring handle part  30  can be rotated to any angular positions and stay there due to the elasticity and friction generated from the washers  25  and the O shaped rubber ring  35  and it is preferable that the washer  25  and the O shaped ring  35  are made of anti-wear, elastic and better friction material such as Teflon, rubber or PE plastics. In this way, effects of elastic tight fit and friction resistance can be obtained between the elongated stem  22  and the projection seat  31  of the ring handle part  30 . Hence, the ring handle part  30  can be located steadily after being turned unless a further turning force is exerted again.  
      It is noted that the preceding explanation is for an elongated stem  22  being attached with a ring handle part  30  only and, actually, there are two pairs of elongated stems and ring handle parts  30 .  
      Advantages for the scissors of the present invention are listed hereinafter:  
      1. The blades  21  can be disposed upwards during the elongated stems and the ring handle parts  30  being disposed downwards with the ring handle parts having an angular position with respect to the elongated stems respectively as shown in  FIG. 8A . The blades  21  and the elongated stems can be disposed horizontally during the ring handle parts  30  being disposed vertically as shown in  FIG. 8B . The blades  21  can be disposed toward downward and the elongated stems  22  and the ring handle parts  30  being disposed upwards as shown in  FIG. 8C .  
      2. The user always keeps his fingers  1 , palm  2  and elbow  3  at the same postures regardless what positions of the scissors shown in  FIGS. 8A, 8B  and  8 C are instead of the postures of the fingers  1 , palm  2  and elbow  3  being changed shown in  FIGS. 3A, 3B  and  3 C. Hence, the present invention offers the user the most comfortable working postures for operating the scissors due to the fingers  1 , palm  2  and elbow  3  being disposed and moved in accordance with the human engineering so that it is operated conveniently and it is not easy to result in fatigued and injured hand.  
      3. The user can move less due to the ring handle parts being able to change positions thereof based on cutting positions so as to enhance cutting efficiency.  
      4. Extension ends  32 ,  33  of the ring handle part  30  are able to be kept contact with fingers in spite of what angular positions of the ring handle part  30  are rotated to assist moving the elongated stems  22  during operating the scissors.  
      While the invention has been described with referencing to a preferred embodiment thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims.