Abstract:
A manual tool capable of unfolding only one work accessory comprises a handle ( 11, 21 ), a first work accessory ( 12, 22 ) and a second work accessory ( 13, 23 ) that are connected to the handle through a pivot and can be unfolded and folded, and an associated accessory ( 14, 24 ). The associated accessory can transform the working state from a folding state to an unfolding state. When the first work accessory and the second work accessory are both folded, the associated accessory does not prevent any work accessory from unfolding; and when one of the two work accessories is unfolded and the other one is folded, the associated accessory prevents the other one from unfolding, so as to ensure that only one work accessory can be unfolded during use, thereby eliminating the safety risk caused by unfolding multiple work accessories at the same time.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to manual tools, specifically to a manual tool capable of unfolding only one work accessory. 
       DESCRIPTION OF THE PRIOR ART 
       [0002]    The conventional manual tools with two or more work accessories (such as cutting knife, tool bit with blade, screwdriver, bottle opener, file etc.) are equipped with two different accessories on two sides of the handle respectively. When the manual tool is in use, the work accessories folded in the handle can be unfolded simultaneously. For convenience, users tend to leave one work accessory (a screwdriver for instance) unfolded after using it and unfold another work accessory (a blade for instance). In this case, there would be at least two work accessories unfolded, which would bring hidden risk to safe handling. 
         [0003]    A double-head knife as published in the Chinese Patent Application No. 200820083045, has two blades on two sides of the handle respectively, when it is used, anyone or both of the two blades can be unfolded. Such tool solved the problem from prior technology that the knives are single-functioned, however, it also brought some hidden risk. Suppose users unfold two heads simultaneously for convenience, they themselves or others can be hurt. 
         [0004]    Thus there is a need for safe manual tools with plural work accessories. 
       SUMMARY OF THE INVENTION 
       [0005]    The technical problem to be solved and the task of the present invention is to overcome the defect that the conventional manual tools may bring hidden risk to safety with more than two work accessories that may be unfolded simultaneously, and to provide a manual tool capable of unfolding only one work accessory to ensure that only one work accessory can be unfolded in use. If the unfolded work accessory is left unfolded, the other work accessory cannot be unfolded. 
         [0006]    To achieve the above-mentioned purpose, the manual tool capable of unfolding only one work accessory in the invention, comprises a handle, a first work accessory and a second work accessory; the first work accessory and the second work accessory are connected to the handle through a pivot and are capable of folding and unfolding; characterized in that an associated accessory is arranged for a working state of the first work accessory and the second work accessory to transform from a folding state to an unfolding state, the folding state being that both the first and second work accessory are folded, the unfolding state being that one of the first work accessory and the second work accessory is unfolded while the other one is folded; while in the folding state, the associated accessory does not prevent any work accessory from unfolding; in the unfolding state, the associated accessory prevents the other one from unfolding. 
         [0007]    Specifically, it can be realized by way of the two following structures: 
         [0008]    Firstly, the first work accessory and the second work accessory are connected to the two sides of the handle through the pivots respectively, wherein the associated accessory is a pull rod, a first member is fixed on the first work accessory and moves with the folding and unfolding of the first work accessory, a second member is fixed on the second work accessory and moves with the folding and unfolding of the second work accessory, the first member and the second member are coupled to the two ends of the pull rod, the first work accessory drives the first member to move after its unfolding, thus to drive the pull rod to move correspondingly to prevent the second member from moving, and thus the second work accessory cannot be unfolded. 
         [0009]    Specifically, the first work accessory is rotationally arranged to a first pivot at one end of the handle through a first axle sleeve fixed on the end of the first work accessory, an outer diameter of the first axle sleeve having a small diameter part and a large diameter part, the second work accessory is rotationally arranged to a second pivot at the other end of the handle through a second axle sleeve fixed on the end of the second work accessory, an outer diameter of the second axle sleeve having a small diameter part and a large diameter part; 
         [0010]    The associated accessory is a pull rod which is set inside the handle and able to move along its length, the two ends of the pull rod surround the first axle sleeve and the second axle sleeve through a first through hole and a second through hole respectively, the first through hole has a first locking wall and the second through hole has a second locking wall; 
         [0011]    While in the folding state, the small diameter part of the first axle sleeve faces the first locking wall and the small diameter part of the second axle sleeve faces the second locking wall, to allow the pull rod to move along its length without preventing any work accessory from unfolding; 
         [0012]    While in the unfolding state, the small diameter part of the first axle sleeve faces the first locking wall, the large diameter part of the second axle sleeve faces the second locking wall, or the large diameter part of the first axle sleeve faces the first locking wall and the small diameter part of the second axle sleeve faces the second locking wall, to prevent the pull rod from moving along its length to prevent the first work accessory from unfolding. 
         [0013]    More specifically, the large diameter part of the first axle sleeve and the large diameter part of the second axle sleeve are cylinder; the small diameter part of the first axle sleeve and the small diameter part of the second axle sleeve are longitudinal plane cut from a cylinder; the first locking wall and the second locking wall are plane. 
         [0014]    The pull rod is flake-like, and the first work accessory and the second work accessory are at the two sides of the pull rod respectively. 
         [0015]    Secondly, the first work accessory and the second work accessory are arranged on the same pivot on the handle reversely; 
         [0016]    A stroke slot is set on one work accessory, a pin is set on the other work accessory as the associated accessory, and the pin extends into the stroke slot; 
         [0017]    While in the folding state, the pin is located at one side of the stroke slot and is able to move from the end to the other end of the stroke slot without preventing any work accessory from unfolding; 
         [0018]    While in the unfolding state, the pin is located on the other end of the stroke slot to prevent the other work accessory from unfolding. 
         [0019]    Further, a first unfolding blocking part and a first folding blocking part are equipped to the first work accessory inside the handle. When the first work accessory is unfolded, the first unfolding blocking part prevents the first work accessory from rotating toward unfolding direction and the first folding blocking part prevents the first work accessory from rotating toward folding direction. 
         [0020]    A second unfolding blocking part and a second folding blocking part are equipped to the second work accessory inside the handle. When the second work accessory is unfolded, the second unfolding blocking part prevents the second work accessory from rotating toward unfolding direction and the second folding blocking part prevents the second work accessory from rotating toward folding direction. 
         [0021]    More specifically, the first unfolding blocking part is a block along the unfolding direction of the first work accessory, the first folding blocking part is a rigid chip on a side of the first work accessory, and when the first work accessory is unfolded, an end of the rigid chip bends to the first work accessory out of its elasticity and holds against the first work accessory to prevent folding; the second unfolding blocking part is a block along the unfolding direction of the second work accessory, the second folding blocking part is a rigid chip on a side of the second work accessory, and when the second work accessory is unfolded, an end of the rigid chip bends to the second work accessory out of its elasticity and holds against the second work accessory to prevent folding. 
         [0022]    Inside the handle, a plate is arranged between the first work accessory and the second work accessory. The first unfolding blocking part, the first folding blocking part, the second unfolding blocking part and second folding blocking part are set on the plate. 
         [0023]    An outlines of the both ends of the plate are same as the outline of the handle. The plate is equipped to the end of the handle through the pivot. A through hole is arranged on the plate to allow the pin to pass though. 
         [0024]    The beneficial effect of the invention is that by equipping an associated accessory which can switch between a folding state and an unfolding state to the first work accessory and the second work accessory, the associated accessory does not prevent any of the work accessory from unfolding in the folding state, while it would prevent the other work accessory from unfolding in the unfolding state, thereby ensuring that only one work accessory can be unfolded. If the unfolded work accessory is not unfolded, the other work accessory cannot be unfolded, thereby eliminating safety risk from unfolding plural work accessories. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0025]      FIG. 1  is a schematic drawing of assembly relationship of the assembly units of one structure of the present invention; 
           [0026]      FIG. 2  is a schematic drawing of the structure shown in  FIG. 1  which is assembled and in the folding state; 
           [0027]      FIG. 3  is an enlarged section view taken along line A-A in  FIG. 2 ; 
           [0028]      FIG. 4  is an enlarged section view taken along line B-B in  FIG. 2 ; 
           [0029]      FIG. 5  is a top view of  FIG. 2 ; 
           [0030]      FIG. 6  is a section view taken along line C-C in  FIG. 5 ; 
           [0031]      FIG. 7  is a schematic drawing of the unfolded second work accessory taken along the view direction of  FIG. 5 ; 
           [0032]      FIG. 8  is a partial section view taken along line D-D in  FIG. 7 ; 
           [0033]      FIG. 9  is a schematic drawing of the unfolded first work accessory taken along the view direction of  FIG. 5 ; 
           [0034]      FIG. 10  is a partial section view taken along line E-E in  FIG. 9 ; 
           [0035]      FIG. 11  is a schematic drawing of another structure of the invention which is in the folding state; 
           [0036]      FIG. 12  is a section view taken along line F-F in  FIG. 11 ; 
           [0037]      FIG. 13  is a section view taken along line G-G in  FIG. 12 ; 
           [0038]      FIG. 14  is a schematic drawing of the unfolded second work accessory of the structure shown in  FIG. 11 ; 
           [0039]      FIG. 15  is a section view taken along line H-H in  FIG. 14 ; 
           [0040]      FIG. 16  is a section view taken along line J-J in  FIG. 15 ; 
           [0041]      FIG. 17  is a schematic draw of the unfolded first work accessory of the structure shown in  FIG. 11 ; 
           [0042]      FIG. 18  is a section view taken along line K-K in  FIG. 17 ; 
           [0043]      FIG. 19  is a section view taken along line L-L in  FIG. 18 ; 
       
    
    
       [0044]    The reference numbers in the Figures are:
     11 —handle,  12 —first work accessory,  13 —second work accessory,  14 —associated accessory,  15 —first axle sleeve,  16 —small diameter part of the first axle sleeve,  17 —large diameter part of the first axle sleeve,  18 —first pivot,  19 —second axle sleeve,  110 —small diameter part of the second axle sleeve,  111 —large diameter part of the second axle sleeve,  112 —second pivot,  113 —first through hole,  114 —second through hole,  115 —first locking wall,  116 —second locking wall;     21 —handle,  22 —first work accessory,  23 —second work accessory,  24 —associated accessory,  25 —pivot,  26 —stroke slot,  27 —first unfolding blocking part,  28 —first folding blocking part,  29 —second folding blocking part,  210 —second folding blocking part,  211 —plate   
 
       DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0047]    Hereinafter, the invention would be further explained with reference to the drawings and embodiments. 
         [0048]    The manual tool capable of unfolding only one work accessory of the invention includes a handle  11 / 21 , a first work accessory  12 / 22  and a second work accessory  13 / 23  connected through pivot(s) to the handle, both of which can be unfolded and folded. The concept of the invention is to arrange a associated accessory  14 / 24 , which can switch between a folding state and an unfolding state, to the first work accessory  12 / 22  and the second work accessory  13 / 23 . The folding state is that the first work accessory and the second work accessory are both folded, and the unfolding state is that one of the first work accessory and the second work accessory is unfolded while the other is folded. The associated accessory would not prevent any work accessory from unfolding in the folding state while the associated accessory would prevent the other work accessory from unfolding in the unfolding state. 
       Embodiment 1 
     Referring to FIGS.  11 - 19   
       [0049]    The first work accessory  12  is rotationally surrounding the first pivot  18  that is arranged on one end of the handle  11  by the first axle sleeve  15  set on the end of the first work accessory  12 . The outer diameter of the first axle sleeve  15  has a small diameter part  16  and a large diameter part  17 . The second work accessory  13  is rotationally surrounding the second pivot  112  arranged on the other end of the handle  11  by the second axle sleeve  19  arranged on the end of the second work accessory  13   w . The outer diameter of the second axle sleeve  19  has a large diameter part  110  and a small diameter part  111 ; 
         [0050]    Referring to  FIGS. 13 ,  16  and  19 , the associated accessory  14  is a pull rod assembled inside the handle  11  and can move along its length. The two ends of the pull rod are surrounding the first axle sleeve  15  and the second axle sleeve  19  through the first through hole  113  and the second through hole  114  respectively. The first through hole  113  has the first locking wall  115  and the second through hole  114  has the second locking wall  116 . The first through hole  113  and the second through hole  114  can be connected, that is to say that the first locking wall  115  has the first axle sleeve  15  on the outside and the second locking wall  116  has the second axle sleeve  19  on the outside; 
         [0051]    Referring to  FIGS. 11-13 , in the folding state, the small diameter part  16  of the first axle sleeve  15  faces to the first locking wall  115  and the small diameter part  110  of the second axle sleeve  19  faces to the second locking wall  116 , these make the pull rod move along its length without preventing any of the work accessory from unfolding (as shown in  FIG. 13 , when unfolding the first work accessory  12  on the left, the small diameter part  16  of the first axle sleeve  15  would act upon the first locking wall  115  to push the pull rod rightwards, enabling the first axle sleeve  15  to rotate from the small diameter part  16  to the large diameter part  17 , thereby unfolding the first work accessory  12 ; when unfolding the second work accessory  13  on the right, the small diameter part  110  of second axle sleeve  19  is kept away from the first locking wall  116 , enabling the second axle sleeve  19  to rotate from the small diameter part  110  to the large diameter part  111 , thereby unfolding the second work accessory  13 ; 
         [0052]    In the unfolding state, the second work accessory  13  unfolds to drive the first axle sleeve  19  to rotate. The small diameter part  16  of the first axle sleeve  15  faces to the first locking wall  115  and the large diameter part  111  of the second axle sleeve  19  turns to face to the second locking wall  116  (as shown in  FIGS. 14-16 ), preventing the pull rod from moving along its length to prevent the first work accessory from unfolding (in this case, the second work accessory  13  is unfolded while the first work accessory  12  is folded, given that the pull rod can not move along its length, when the second work accessory  13  rotates towards the folding direction, the second axle sleeve  19  would rotate from the large diameter part  111  to the small diameter part  110  without being confined by the second locking wall  116 , thus can be unfolded; when the first work accessory  12  rotates towards the unfolding direction, the small diameter part  16  of the first axle sleeve  15  would rotate to the large diameter part  17 , confined by the first locking wall  115 , the first work accessory  12  can not be unfolded). Or the first work accessory  12  drives the first axle sleeve  15  to rotate. The large diameter part  17  of first work accessory  15  turns to face the first locking wall  115 , the small diameter part  110  of second axle sleeve  19  faces to the second locking wall  116  (as shown in  FIGS. 17-19 ), preventing the pull rod from moving along its length to prevent the second work accessory from unfolding (in this case, the first work accessory  12  is unfolded while the second work accessory  13  folded, since the pull rod cannot move along its length, when the first work accessory  12  rotates towards the folding direction, the first axle sleeve  15  rotates from the large diameter part  17  to the small diameter part  16  without being confined by the first locking wall  115 , thus the first work accessory  12  can be folded; when the second work accessory  13  rotates towards the unfolding direction, the small diameter part  110  of the second axle sleeve  19  rotates to the large diameter part  111 , confined by the second locking wall  116 , the second work accessory  13  cannot be unfolded). 
         [0053]    To achieve the above-mentioned purpose, in the invention, the space between the first locking wall  115  and the second locking wall  116  is bigger than or equal to the utmost outer length between the first axle sleeve  15  and the second axle sleeve  19  when the large diameter part  17  of the first axle sleeve  15  faces to the first locking wall  115  and the small diameter part  110  of the second axle sleeve  19  faces to the second locking wall  116 . The space should also be bigger than or equal to the utmost outer length between the first axle sleeve  15  and the second axle sleeve  19  when the large diameter part  111  of the first axle sleeve  19  faces to the first locking wall  116  and the small diameter part  16  of the second axle sleeve  15  faces to the second locking wall  115 . Also, the space should be smaller than the utmost outer length between the first axle sleeve  15  and the second axle sleeve  19  when the large diameter part  17  of the first axle sleeve  15  faces to the first locking wall  115  and the large diameter part  111  of the second axle sleeve  19  faces to the second locking wall  116 . 
         [0054]    Specifically, in order to obtain a better blocking effect, the large diameter part  16  of the first axel sleeve and the large diameter part  111  of the second axel sleeve are cylindrical, while the small diameter part  16  of the first axel sleeve and the small diameter part  110  of the second axel sleeve are longitudinal planes cut out of a cylinder. The first locking wall  115  and the second locking wall  116  are planar. In order to obtain a compact structure, the pull rod is plate-like, the first work accessory  12  and the second work accessory  13  are located on the two sides of the pull rod respectively. Each of the first work accessory  12  and the second work accessory  13  has a hole corresponding to and surrounding the first axle sleeve  15  and the second axel sleeve  19  respectively, enabling the first work accessory  12  and the second work accessory  13  to drive the first axel sleeve  15  and the second axel sleeve  19  to rotate when being unfolded or folded. 
         [0055]    Referring to the Figures, the first work accessory or the second work accessory is a blade mounting frame with a replaceable blade while the other one is a general knife. The first work accessory  12  and the second work accessory  13  are connected respectively to the two sides of the handle  11  through the pivots, wherein the associated accessory  14  is a pull rod, the first member  15  is fixed on the first work accessory  12 , the first member  15  moves with the folding and unfolding of the first work accessory  12 , the second member  19  is fixed on the second work accessory  13 , the second member  19  moves with the folding and unfolding of the first work accessory  13 , the first member  15  and the second member  19  are set on the two ends of the pull rod respectively, the first work accessory  12  drives the first member  15  to move after its unfolding, this drives the pull rod  14  to move correspondingly, to limit the motion of the second member  19 , thereby preventing the second work accessory  13  from unfolding. 
         [0056]    In this case, the first member  15  projects from the side of the first work accessory  12  while the second member  19  projects from the side of the second work accessory  13 . The pull rod  14  has stroke slots  113  and  114  respectively on the corresponding positions at the two ends. The first member  15  and the second member  19  extend to the corresponding stroke slots  113  and  114  respectively. The first work accessory or the second work accessory would drive the first member or the second member to move when unfolds, thus drive the pull rod  14  to move correspondingly. The pull rod changes the position after moving, thereby preventing another work accessory from unfolding. In the embodiment, the first member and the second member surround the pivots of the first work accessory and the second work accessory respectively. The stroke slots are through holes, the first member and the second member laterally extend into the through holes respectively. 
         [0057]    The embodiment is not limited to the cases that only one accessory is set on one end, but can be extend to the cases that a plurality of accessories are set on one end and the accessories on one end can not be unfolded if one of the accessories on the other end is unfolded. For instance, one end of the handle is equipped with a first accessory and a third accessory while the other end with a second accessory and a fourth accessory. The second accessory and the fourth accessory cannot be unfolded if the first or the third accessory is unfolded. The instance herein and other similar embodiment are all in the protection range of the Claims. 
       Embodiment 2 
     Referring FIGS.  1 - 10   
       [0058]    A first work accessory  22  and a second work accessory  23  are reversely arranged on the same pivot  25  of the handle  21  (being reversely set means that the unfold direction of the first work accessory and the second work accessory are opposite, as shown in  FIG. 1 . The first work accessory is unfolded when rotating clockwise while the second work accessory is unfolded when rotating anticlockwise); 
         [0059]    A stroke slot  26  is set on one work accessory (a stroke slot  26  is set on the second work accessory  23  is shown in the Figure) and a pin is set on the other work accessory (a pin set on the first work accessory  22  is shown in the Figure) as the associated accessory  24 , and the pin extends into the stroke slot  26  (the position of the stroke slot  26  and the pin can be exchanged in a specific embodiment). 
         [0060]    In the folding state (as shown in  FIGS. 1-6 ), the pin is located on one end of the stroke slot  26 . Relative to the stroke slot  26 , the pin can move from one end to the other without preventing any work accessory from unfolding (as shown in  FIG. 1 , the pin is on the top of the stroke slot  26 , thus the first work accessory  22  can rotate clockwise and the stroke slot  26  maintains its position, while the pin can rotate to the bottom of the stroke slot  26 , thus unfolding the first work accessory  22 . Also the second work accessory  23  can rotate anticlockwise and the rotate maintains its position. After the stroke slot  26  rotates to a certain angle, the pin would alternate its position relative to the stroke slot from one end to the other, thus unfolding the second work accessory  23 ); 
         [0061]    In the unfolding state, the pin is located on the other end of the stroke slot  26  to prevent the other work accessory from unfolding (as shown in  FIGS. 7 and 8 , when the second work accessory  23  unfolds, if the first work accessory  22  rotates toward the unfolding direction, the stroke slot  26  would prevent the pin from rotating, thus prevent the second work accessory from unfolding; as shown in  FIGS. 9 and 10 , when the first work accessory  22  unfolds, suppose the second work accessory  23  rotates toward the unfolding direction, the pin would prevent the stroke slot  26  from rotating, thus prevent the second work accessory from unfolding). 
         [0062]    The pin  24  is set aside the pivot  25 . The stroke slot  26  is set on a corresponding position of the second work accessory and it is arc-shaped. The stroke slot  26  is the travel path of the pin  24  during the first work accessory  22  or the second work accessory  23  rotating around the pivot  25  from folding to unfolding. 
         [0063]    In order to secure the unfolded work accessory and prevent it from unexpected rotating, the first unfolding blocking part  27  as well as the second folding blocking part  28  inside the handle  21  are equipped to the first work accessory  22 . When the first work accessory  22  is unfolded, the first unfolding blocking part  27  would prevent the first work accessory  22  from rotating toward the unfolding direction and the first folding blocking part  28  would prevent the first work accessory  22  from rotating toward the folding direction. The second unfolding blocking part  29  as well as the second folding blocking part  210  inside the handle  21  are equipped to the second work accessory  23 . When the second work accessory  23  is unfolded, the second unfolding blocking part  29  would prevent the second work accessory  23  from rotating toward the unfolding direction and the second folding blocking part  210  would prevent the second work accessory  23  from rotating towards the folding direction. 
         [0064]    Specifically, the first folding blocking part  27  is a block set along the unfolding direction of the first work accessory  22 . The first folding blocking part is a rigid chip on the side of the first work accessory  22 . When the first work accessory  22  is unfolded, the end of the rigid chip would bend to the first work accessory elastically and hold against the first work accessory to prevent it from folding (as shown in  FIGS. 1 ,  9 - 10 , before the first work accessory is folded, the rigid chip should be pushed aside toward the first work accessory, thus the first work accessory can be folded). The second folding block part  29  is a block along the unfolding direction of the second work accessory  23 . The second folding block part  210  is a rigid chip on the side of the second work accessory  23 . When the second work accessory  23  is unfolded, the end of the rigid chip would bend to the second work accessory elastically and hold against the second work accessory to prevent it from folding (as shown in  FIGS. 1 ,  7 - 8 , before the second work accessory is folded, the rigid chip should be pushed aside toward the second work accessory, and the second work accessory can be folded). In order to make the structure compact, between the first work accessory  22  and the second work accessory  23 , the plate  211  is set inside the handle. The first unfolding blocking part  27 , the first folding blocking part  28 , the second unfolding blocking part  29  and the second folding blocking part  210  are set on the plate  211 . In order to make the structure in order, the outlines of the two sides of the plate  211  are the same with or smaller than that of the handle. So that with the pivot fixing the plate on the end of the handle, a through hole of the same size and shape with the stroke slot is set on the plate to allow the pin mentioned before go through it. 
         [0065]    Referring to the Figures, the first work accessory or the second work accessory is a blade mounting frame with a replaceable blade while the other one is a general knife.