Abstract:
Disclosed is a spanner tool for mounting or dismounting components, which comprises a control piece ( 2 ), a connecting piece ( 1 ) and a rotating piece ( 3 ). The connecting piece ( 1 ) is hinged with one end of the control piece ( 2 ) and one end of the rotating piece ( 3 ) respectively. An angle β formed between the control piece ( 2 ) and the connecting piece ( 1 ) is less than an angle α formed between the rotating piece ( 3 ) and the connecting piece ( 1 ) when the control piece ( 2 ) and the rotating piece ( 3 ) respectively rotate to limit positions at different sides of the connecting piece ( 1 ). The spanner tool is practical and reliable. During use, a user does not need to swing his/her arm and only needs to rotate his/her wrist to operate the spanner tool, so the spanner tool is convenient and rapid-in-use. The spanner tool can be folded for portability when not in use. Additionally, locking tightness of the tool can be adjusted by adjusting a nut.

Description:
TECHNICAL FIELD 
       [0001]    The present application relates to a spanner tool, especially to a spanner tool for mounting or dismounting components. 
       BACKGROUND OF THE INVENTION 
       [0002]    In the technology field of mechanism or in daily life, mounting or dismounting components is very common. The patent application with the application number of CN200610058779.8 and the title of “a spanner with swinging head and button structure” published on Mar. 14, 2007 that, the button structure of the spanner comprises a handle, a swinging head and a button; the handle comprises a first end and a second end; the first end is a turning portion, and the second part is provided with a pivot portion; the button is pivotally connected on the abdominal region of the swinging head and can make the swinging head swing pivotally, but the angles of the handle cannot be changed, and the handle cannot be turned quickly. The patent application with the application number of CN200510015991.1 and the title of “positioning structure for head pivotal swinging of a spanner” published on May 17, 2007 that, the working head can be positioned at any angles required; two working heads can even be realized, but the handle is not convenient for turning rapidly; what&#39;s more, two ends of the whole tool cannot be folded, so the spanner is too long to store easily; if the length of the rotating rod of the spanner is reduced, the spanner will be easy to store, but the long moment arm of force which is convenient for holding and rotating can no longer be obtained. The American patent application with the publication number of US20100154604 discloses a tool with adjustable working angle, as shown in a stereogram of the prior art in  FIG. 1 , the tool comprises a first rod, a second rod and a connecting member provided at both ends thereof with a first connecting portion and a second connecting portion; the first connecting portion is pivotally connected between the first clamping portions of the first rod, and the second connecting portion are pivotally connected between the two second clamping portions of the second rod; the head of the tool is provided at the other end of the second rod. As shown in a schematic diagram of the prior art in  FIG. 2 , when the tool is in the limiting position, the first rod and the second rod of the connecting member are approximately perpendicular to each other, therefore, a user needs to substantively swing his/her arm when mounting or dismounting components. The tool is time-consuming and laborious and has low efficiency in mounting or dismounting components. 
       SUMMARY OF THE INVENTION 
       [0003]    A first objective of the present invention is to provide a spanner tool flexible and labour-saving. 
         [0004]    A second objective of the present invention is to provide a spanner tool which can regulate the locking tightness. 
         [0005]    A third objective of the present invention is to provide a spanner tool which is easy to store and portable. 
         [0006]    The objectives of the present invention are achieved by the following technical schemes: 
         [0007]    A spanner tool comprises a connecting piece, a control piece and a rotating piece; two ends of the connecting piece are respectively hinged with one end of the control piece and one end of the rotating piece; when the control piece and the rotating piece respectively turn to limiting positions at different sides of the connecting piece, an angle β formed between the control piece and the connecting piece is less than an angle α formed between the rotating piece and the connecting piece. 
         [0008]    The connecting piece comprises an intermediate connecting rod; each of the two end faces of the intermediate connecting rod is provided with a chamfer, the two chamfers are disposed at different sides of an axis of the intermediate connecting rod; the control piece or the rotating piece can turn and get across a corresponding one of the chamfers, and is pressed against and positioned by the intermediate connecting rod; the two end faces of the intermediate connecting rod are right angle faces  118  respectively at the sides opposite to the chamfers; when it is turned to be on a straight line with the connecting piece, the control piece or the rotating piece is pressed against and positioned by the intermediate connecting rod. 
         [0009]    The control piece is fixedly positioned when it is turned across the chamfer and gets perpendicular to the connecting piece; and the angle α formed between the rotating piece and the connecting piece is greater than 90 degrees and less than 180 degrees when the rotating piece is turned across the chamfer and gets fixedly positioned. 
         [0010]    The rotating piece is fixedly positioned when it is turned across the chamfer and gets perpendicular to the connecting piece; the angle β formed between the control piece and the connecting piece is less than 90 degrees when the control piece is turned across the chamfer and gets fixedly positioned. 
         [0011]    Two ends of the intermediate connecting rod are provided respectively with a first groove and a second groove; one end of the control piece is provided with a flat convex platform; the flat convex platform is provided with a round platform at its root; one end of the rotating piece is provided with a flat protuberance; the flat protuberance is provided with a platform at its root; and the flat protuberance and the flat convex platform respectively match with the first groove and the second groove. 
         [0012]    The round platform of the control piece is provided with a nick at a side where the chamfer of the intermediate connecting rod is located; a notch is provided on an outer surface of the intermediate connecting rod for accommodating the nick of the round platform. 
         [0013]    The intermediate connecting rod has an axially extending bore; an inner pressing spring and two intermediate pressing pins are disposed in the axially extending bore; and the two inner pressing pins are disposed at two sides of the inner pressing spring respectively, and extend through the axially extending bore partially to press against the control piece or rotating piece. 
         [0014]    The rotating piece comprises a shell, a connecting block, a central spindle, an elastic element, an adjusting nut and rotating elements; one end of the connecting block is hinged with the connecting piece, the other end of the connecting block is provided with a platform; the central spindle is provided with a joint at one end and a cylindrical platform at the other end; the rotating elements are disposed between the platform of the connecting block and the platform of the central spindle; the elastic element and the adjusting nut are sleeved on the joint of the central spindle; the adjusting nut engages with the shell; and the elastic element is provided between the cylindrical platform of the central spindle and the adjusting nut. 
         [0015]    Several grooves are evenly distributed on the platform of the connecting block; the cylindrical platform of the central spindle has several holes evenly distributed in its outer end face; and the rotating elements are placed in the holes. 
         [0016]    One end of the rotating piece is provided with a first seat, which is provided with a second hinging hole and limit grooves; one end of the control piece is provided with a second seat, which is provided with a first hinging hole and positioning grooves; each end of the connecting piece is provided with a button; a spring is sleeved on a lower end of the button; an intermediate portion of the button is provided with a convex plate; and the convex plate matches with the limit grooves and the positioning grooves; and an upper end of the button extends through the connecting piece. 
         [0017]    The spanner tool of the present invention is practical and reliable. During use, a user does not need to swing his/her arm and only needs to rotate his/her wrist to operate the spanner tool, so the spanner tool is convenient and rapid-in-use. The spanner tool can be folded for portability when not in use. Additionally, locking tightness of the tool can be adjusted by adjusting a nut. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]      FIG. 1  is a stereogram of the prior art; 
           [0019]      FIG. 2  is a schematic diagram of the prior art; 
           [0020]      FIG. 3  is a schematic diagram illustrating the first embodiment of the spanner tool of the present invention; 
           [0021]      FIG. 4  is a schematic diagram illustrating the second embodiment of the spanner tool of the present invention; 
           [0022]      FIG. 5  is a front view of the first embodiment of the spanner tool of the present invention; 
           [0023]      FIG. 6  is a sectional view of the first embodiment of the spanner tool of the present invention; 
           [0024]      FIG. 7  is an exploded view of the first embodiment of the spanner tool of the present invention; 
           [0025]      FIG. 8  is a stereogram illustrating an intermediate connecting rod of the spanner tool of the present invention; 
           [0026]      FIG. 9  is a sectional view of the intermediate connecting rod of the spanner tool of the present invention; 
           [0027]      FIG. 10  is a stereogram illustrating a shell of the spanner tool of the present invention; 
           [0028]      FIG. 11  is a stereogram illustrating a connecting block of the spanner tool of the present invention; 
           [0029]      FIG. 12  is a stereogram illustrating a connecting rod for handle of the spanner tool of the present invention; 
           [0030]      FIG. 13  is a stereogram illustrating a central spindle of the spanner tool of the present invention; 
           [0031]      FIG. 14  is a schematic view illustrating a working status of the first embodiment of the spanner tool of the present invention; 
           [0032]      FIG. 15  is a sectional view of the working status of the first embodiment of the spanner tool of the present invention; 
           [0033]      FIG. 16  is a stereogram illustrating the second embodiment of the spanner tool of the present invention; 
           [0034]      FIG. 17  is a schematic view illustrating a working status of the second embodiment of the spanner tool of the present invention; 
           [0035]      FIG. 18  is an exploded view illustrating the third embodiment of the spanner tool of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0036]    The spanner tool of the present invention will be described in more details with reference to the accompanying Figures. 
         [0037]    According to a first embodiment, as shown in  FIGS. 5-15 , the spanner tool comprises a connecting piece  1 , a control piece  2  and a rotating piece  3 . Two end of the connecting piece  1  are respectively hinged with one end of the control piece  2  and one end of the rotating piece  3 . 
         [0038]    The control piece  2  comprises a handle  21  and a connecting rod  22  for handle. The handle  21  and the connecting rod  22  for handle can rotate relative to each other. The handle has concave-convex patterns thereon and may be made of special material, such as rubber, to increase frictional force when it is held and to prevent it from slipping from the hand of the user. As shown in  FIG. 12 , one end of the connecting rod  22  for handle is a cylinder  221 , on which the handle  21  is sleeved; the other end of the connecting rod  22  for handle is provided with a flat convex platform  222 ; the flat convex platform  222  is provided with a round platform  223  at its root, and has a first hinging hole  224  thereon. 
         [0039]    The rotating piece  3  comprises a shell  31 , a connecting block  32 , a central spindle  33 , an elastic element  34 , an adjusting nut  35 , rotating elements  36  and a washer  37 . As shown in  FIG. 11 , the connecting block  32  is provided with a flat protuberance  321 , which has a second hinging hole  323  thereon; the root of the flat protuberance  321  is provided with a platform  322 , the platform  322  has several grooves  324  evenly disposed at its outer end face. As shown in  FIG. 10 , the shell is hollow and has an opening on one end and a flat groove  312  on the other end. The connecting block  32  can go through the opening  311  of the shell  31 , and the flat protuberance  321  of the connecting block  32  can extend through the flat groove  312  of the shell  31 . The platform  322  of the connecting block  32  is encased in the shell  31 . The shell  31  and the connecting block  32  cannot rotate relative to each other. As shown in  FIG. 13 , the central spindle  33  is provided with a joint  331  at one end and a cylindrical platform  332  at the other end; the cylindrical platform  332  has several holes  333  evenly disposed at its outer end face. The rotating elements  36  are placed in the holes  333  and extend through the holes partially, and can rotate on the outer end face of the platform  322  of the connecting block  32 . The adjusting nut  35  is sleeved on the joint  331 , and external threads of the adjusting nut  35  are engaged with internal threads of the shell  31 . The elastic element  34  sleeved on the joint  331  is provided between the cylindrical platform  332  of the central spindle  33  and the adjusting nut  35 . The flat protuberance  321  of the connecting block  32 , the cylindrical platform  332  of the central spindle  33 , the washer  37  and the elastic element  34  are all disposed inside the shell. The holes  333  distributed in the outer end face of the cylindrical platform  332  may be through holes, and the washer  37  may be provided correspondingly on the other end of the cylindrical platform  332  to exert a force upon the rotating elements  36 . The elastic element  34 , which may be a spring, a spring leaf or other elastic components, is provided between the washer  37  and the adjusting nut  35 . 
         [0040]    The connecting piece  1  comprises an intermediate connecting rod  11 , an inner pressing spring  13 , two inner pressing pins  12  and two shaft pins  14 . The intermediate connecting rod  11  has an axially extending bore  111 , and the inner pressing spring  13  and the two inner pressing pins  12  are disposed in the axially extending bore  111 . The two inner pressing pins  12  are disposed at two sides of the inner pressing spring  13  respectively and extend partially out of the axially extending bore  111 . As shown in  FIGS. 8 and 9 , two ends of the intermediate connecting rod  11  are provided with a first groove  116 , a second groove  117  and third hinging holes  113 ; two end faces of the intermediate connecting rod  11  are provided with chamfers  114 ,  115 , which are disposed at different sides of the axis of the intermediate connecting rod  11 . The two end faces of the intermediate connecting rod  11  are in the form of right angle faces  118  respectively at the sides opposite to the chamfers. The first groove  116  matches with the flat protuberance  321  of the connecting block  32 , which extends through the shell  31 . The bottom of the first groove  116  is in the form of an inclined face  112 , and the chamfer  115  is located at the side where the first groove  116  is shallower, namely, the chamfer  115  is at the same side as the higher side of the inclined face  112 . One shaft pin  14  goes through the third hinging hole  113  in the first groove  116  of the intermediate connecting rod  11  and the second hinging hole  323  of the connecting block  32 , so as to hinge the connecting piece  1  with the rotating piece  3 . The end face of the shell  31  presses against the end face of the intermediate connecting rod  11 , and the rotating piece  3  can only turn towards the side of the first groove  116  where the chamfer  115  is located, until the inclined face  112  presses against the lateral face of the flat protuberance  321  of the connecting block  32 . The rotation angle of the rotating piece  3  relative to the connecting piece  1  is less than 90 degrees. The second groove  117  matches with the flat convex platform  222  of the connecting rod  22  for handle. One side of the second groove  117  is provided with the chamfer  114 . The end face of the round platform  223  of the connecting rod  22  for handle presses against the end face of the intermediate connecting rod  11 , and the connecting rod  22  for handle can only turn towards the side of the second groove  117  where the chamfer  114  is located, until the bottom of the second groove  117  presses against the lateral face of the flat convex platform  222  of the connecting rod  22  for handle. That is to say, the control piece  2  and the rotating piece  3  turn toward different sides of the connecting piece  1  when the control piece  2 , the rotating piece  3  and the connecting piece  1  get on a straight line. Under the action of the inner pressing spring  13 , the two inner pressing pins  12  respectively press against the flat protuberance  321  of the connecting block  32  and the flat convex platform  222  of the connecting rod  22  for handle, so that the control piece  2  and the rotating piece  3  will not get too loose when the control piece  2  and the rotating piece  3  respectively turn relative to the connecting piece  1 , and the operating of the spanner tool will not be affected. 
         [0041]    According to the spanner tool of the first embodiment, when the control piece  2  and the rotating piece  3  respectively turn toward different sides of the connecting piece  1  to limiting positions, while the control piece  2 , the rotating piece  3  and the connecting piece  1  are on a straight line, the angle α formed between the rotating piece  3  and the connecting piece  1  is greater than 90 degrees, and the angle β formed between the control piece  2  and the connecting piece  1  is 90 degrees, so the free end of the control piece  2  inclines to the rotating piece  3 . As shown in  FIG. 3 , the distance from the free end of the control piece to the straight line where the rotating piece is located is less than the distance from the hinged end of the control piece to the straight line where the rotating piece is located, therefore, a user can operate the spanner tool of the first embodiment only with his/her wrist and without substantially swinging his/her arm, so the spanner tool is convenient and quick-in-use. After the tightening target is tightened, if the user continues to exert a force upon the spanner tool, the counterforce that the tightening target exerts upon the joint  331  is greater than the friction force between the rotating elements  36  and the platform  322  of the connecting block  32 ; when the rotating elements  36  rotates on the platform  322  of the connecting block  32  and passes through the grooves  324  on the platform  322 , there will be sounds indicating that the target has been tightened, so as to prevent the target from being tightened by the spanner tool excessively. The user can regulate the adjusting nut  35 , so as to change the elastic force of the elastic element  34  pressed, to change the friction force between the rotating elements  36  and the platform  322  of the connecting block  32 , and to set the tightening force of the spanner tool. By changing the shape of the grooves  324  on the platform  322 , it is possible to make the rotating elements  36  turn in only one direction on the end face of the platform  322  of the connecting block  32 , or that greater force is needed in driving the rotating elements  36  to turn in the converse direction on the end face of the platform  322  of the connecting block  32 , in this case the spanner tool can be used for both mounting or dismounting components, for example, the profile of the section plane of the grooves  324  at the side in the direction of rotation is a moderating and smooth curve, and the profile at the other side is a curve with greater slope. 
         [0042]    According to the spanner tool of the first embodiment, the shape of bottoms of the first groove  116  and the second groove  117  of the intermediate connecting rod  11  can be designed as required, such as to be an inclined plane or steps, provided that the angle β formed between the control piece  2  and the connecting piece  1  is less than the angle α formed between the rotating piece  3  and the connecting piece  1  when the first groove  116  and the second groove  117  respectively press against the lateral face of the flat protuberance  321  of the connecting block  32  and the lateral face of the flat convex platform  222  of the connecting rod  22  for handle. 
         [0043]    According to the second embodiment, as shown in  FIGS. 16 and 17 , the spanner tool comprises a connecting piece  1 , a control piece  2  and a rotating piece  3 . The structures not denoted are just the same as those in the first embodiment. 
         [0044]    The control piece  2  comprises a handle  21  and a connecting rod  22  for handle. The handle  21  and the connecting rod  22  for handle can rotate relative to each other. One end of the connecting rod  22  for handle is provided with the flat convex platform  222 ; the flat convex platform  222  is provided with a round platform  223  at its root and has a first hinging hole  224 . The round platform  223  of the control piece  2  is provided with a nick  226  at the side where the chamfer of the intermediate connecting rod  11  is located, and the nick  226  can be seen when the connecting piece  1  and the control piece  2  are on a straight line. 
         [0045]    One end of the rotating piece  3  is provided with the flat protuberance  321 , which has the second hinging hole  323  thereon and is provided with the platform  322  at its root. The other end of the rotating piece  3  is provided with the joint  331 . 
         [0046]    Two ends of the connecting piece  1  are respectively provided with the first groove  116 , the second groove  117  and the third hinging holes  113 . The chamfers  114 ,  115  are respectively provided on two end faces of the connecting piece  1  at the sides where the first groove  116  and the second groove  117  are located. The chamfers  114 ,  115  are located at different sides of the axis of the connecting piece  1 . The two end faces of the intermediate connecting rod  11  are in the form of right angle faces  118  respectively at the sides opposite to the chamfers. The first groove  116  and the second groove  117  respectively match with the flat protuberance  321  and the flat convex platform  222 , so that the first groove  116  is hinged with the flat protuberance  321  by one shaft pin  14 , the second groove  117  is hinged with the flat convex platform  222  by another shaft pin  14 . The rotating piece  3  can turn and get across the chamfer  115 , and be pressed against and positioned by the intermediate connecting rod  11 . When the control piece  2  or the rotating piece  3  turns to be on the same straight line where the connecting piece  1  is located, it is pressed against and positioned by the right angle face  118  at the corresponding end of the intermediate connecting rod  11 . The second embodiment is different from the first embodiment in that: in the second embodiment, the bottom of the first groove  116  is level; the rotation angle of the rotating piece  3  relative to the connecting piece  1  is 90 degrees; the connecting rod  22  for handle can turn towards the side of the second groove  117  where the chamfer  114  is located; a notch  110  is provided on the outer surface of the connecting piece  1  for accommodating the nick  226  of the round platform  223 , which makes the rotation angle of the control piece  2  relative to the connecting piece  1  greater than 90 degrees. As shown in  FIG. 4 , when the control piece  2  and the rotating piece  3  respectively turn to the limiting positions at different sides of the connecting piece  1 , the angle β formed between the control piece  2  and the connecting piece  1  is less than 90 degrees, while the angle α formed between the rotating piece  3  and the connecting piece  1  is 90 degrees, so the distance from the free end of the control piece to the straight line where the rotating piece is located is less than the distance from the hinged end of the control piece to the straight line where the rotating piece is located. Therefore, the user can operate the spanner tool within relatively smaller area to mount or dismount bolts with the handle; the spanner tool is more flexible in use and more convenient for exerting force. 
         [0047]    According to the third embodiment, as shown in  FIG. 18 , the spanner tool comprises a connecting piece  1 , a control piece  2  and a rotating piece  3 . Two ends of the connecting piece  1  are respectively hinged with one end of the control piece  2  and one end of the rotating piece  3 . 
         [0048]    The connecting piece  1  comprises two parallel lateral plates  16 , which have concave arc surfaces at their intermediate parts, for pulling out the control piece  2  and the rotating piece  3  easily by hand. A fourth hinging hole  161  and a second through hole  162  are provided at each end of the lateral plate  16 . An inner padding block  15 , each end of which is provided with a semi-circle groove  151 , is disposed between the two lateral plates. One side of the semi-circle groove  151  is provided with a projecting lug  152 . A button  17 , an intermediate portion of which is provided with a convex plate  171 , is disposed inside the semi-circle groove  151 . One end of the button  17  goes through a spring  18  and the projecting lug  152  in turn and is set in the through hole  162  of one lateral plate. The spring  18  is disposed inside the convex plate  171  and the projecting lug  152 , and the other end of the button  17  extends through the through hole  162  of the other lateral plate. The spring can be further pressed by pressing the end of the button  17  which extends through the through hole  162 . 
         [0049]    The rotating piece  3  is provided with a joint  331  on one end, and a first seat  38  on the other end. The first seat  38  is provided with a second hinging hole  323  and three limit grooves  381 ,  382 ,  383 . The second hinging hole  323  is used for installing the shaft pin  14 . Centers of the three limit grooves are disposed at regular distances along a semicircle, the center of the semicircle is the second hinging hole  323 . Centers of the limit grooves  381 ,  383  and the second hinging hole  323  are disposed on a straight line. When the convex plate  171  is accommodated in the limit groove  381 , the rotating piece  3  and the connecting piece  1  are outspreaded to be on a straight line; when the convex plate  171  is accommodated in the limit groove  382 , the rotating piece  3  and the connecting piece  1  are perpendicular to each another; when the convex plate  171  is accommodated in the limit groove  383 , the rotating piece  3  is in a state of being folded. 
         [0050]    The control piece  2  comprises a handle  21  and a connecting rod  22  for handle. The handle  21  and the connecting rod  22  for handle can rotate relative to each other. One end of the connecting rod  22  for handle is a cylinder  221 , on which the handle  21  is sleeved; the other end of the connecting rod  22  for handle is provided with a second seat  220 , which is provided with a first hinging hole  224  and three positioning grooves  227 ,  228 ,  229 . The first hinging hole  224  is used for installing the shaft pin  14 . Centers of the limit grooves  227 ,  229  and the first hinging hole  224  are disposed on a straight line. The line connecting the center of the first hinging hole  224  and the center of the positioning grooves  228  forms an acute angle with the line connecting the center of the first hinging hole  224  and the center of the positioning grooves  229 . When the convex plate  171  is accommodated in the positioning groove  227 , the control piece  2  and the connecting piece  1  are outspreaded to be on a straight line, which contributes to lengthening the rotating tool to gain longer moment arm of force; when the convex plate  171  is accommodated in the positioning groove  229 , the control piece  2  and the connecting piece  1  are in states of being folded; when the convex plate  171  is accommodated in the positioning groove  228 , the control piece  2  and the connecting piece  1  are in common operating states, at this time, the angle between the control piece  2  and the connecting piece  1  is a an acute angle, namely, less than 90 degrees. 
         [0051]    In another scheme for the third embodiment, the positions of the positioning grooves  227 ,  228 ,  229  and the limit grooves  381 ,  382 ,  383  are changed, so that the rotating piece  3  and the connecting piece  1  may have three kinds of relative positions, namely, the angle between the rotating piece  3  and the connecting piece  1  is 0 degree, an obtuse angle or 180 degrees, also the control piece  2  and the connecting piece  1  may have three kinds of relative positions, namely, the angle between the control piece  2  and the connecting piece  1  is 0 degree, 90 degrees or 180 degrees. Based on the principles of two schemes of the third embodiment, the function of the present invention can be implemented by designing the positions of the positioning grooves  227 ,  228 ,  229  and the limit grooves  381 ,  382 ,  383 , and ensuring the angle β formed between the control piece  2  and the connecting piece  1  less than the angle α formed between the rotating piece  3  and the connecting piece  1 . 
         [0052]    It should be understood that the present invention is not restricted to the preferred embodiments. Various modifications or identical replacements may be made based on the structure, features and principles of the present invention without departing from the scope of the invention.