Abstract:
The bidirectional wrench of the present disclosure achieves two working modes and can convert between them conveniently. During use of the bidirectional wrench of the present disclosure, the input torque that the operator exerts is a clockwise torque or a counterclockwise torque, the output torque of the output end of the bidirectional wrench of the present disclosure is a clockwise torque or a counterclockwise torque, alternatively.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a continuation-in-part of PCT/CN2013/070641 filed on Jan. 18, 2013 and PCT/CN2014/080303 filed on Jun. 19, 2014, and all contents of the two prior PCT applications are incorporated herein by reference. 
     
    
     FIELD OF THE DISCLOSURE 
       [0002]    The present disclosure relates to a hand tool, particularly to a bidirectional wrench. 
       BACKGROUND OF THE DISCLOSURE 
       [0003]    During use of common hand tools such as screwdrivers and torque wrenches, there is a movement limitation of the human hand when rotating; more specifically, the inability of the human hand to turn continuously in one direction. The operation of such a tool, which a rotation axis of the handle is coaxial with the tool&#39;s main shaft comprises a repetition of the following cycle: first, the hand rotates the handle in the desirable direction (e.g., tightening or loosening a screw); second, the hand rotates in the opposite direction to reposition the tool for the next cycle. During the second portion of the above mentioned cycle, the hand&#39;s reversed rotation can be achieved by re-grasping the handle after releasing it, by the tool if it is equipped with a one-way means such as a ratchet surface to keep the main shaft stationary during the reversed rotation of the handle, or by re-inserting the tool bit to the screw after extracting the bit from engagement with the screw. However, in any case, the hand&#39;s reversed rotation could not bring any effective advance of the fastener, and therefore it becomes a wasted movement. 
         [0004]    U.S. Pat. No. 5,931,062 discloses a mechanical rectifier, which comprises a shaft; two driving elements mounted on the shaft, each having a one-way clutch interposed between it and the shaft, with the clutches oriented in the same way on the shaft so that the shaft is always entrained in only one direction of rotation when either one of the two driving elements is rotated in that direction, and the shaft is overrun by a driving element that is rotated in the opposite direction; a rotation means positioned along the axis of the shaft and engaging a selected one of the driving elements; and a reversing mechanism coupling the two driving elements together and forcing them to always rotate in opposite directions so that one driving element entrains the shaft and the other driving element overruns the shaft, thus causing the shaft to always turn in only one direction regardless of the direction of rotation of the driving elements, so the bidirectional rotation of the rotation means (e.g., a handle) transfers into the unidirectional rotation of the shaft. The mechanical rectifier can efficiently utilize the rotations of the rotation means in either way; whether the handle rotates clockwise or counterclockwise, the shaft rotates in the same direction, therefore it can improve the efficiency of the hand motion, and save operation time. 
         [0005]    However, the converting mechanism of the invention can only make the shaft rotate in one direction, which does not allow the rotation of the shaft in two directions. Tightening or loosening a fastener with a torque wrench equipped with the converting mechanism of the invention could only get the result of tightening a fastener (or loosening a fastener) no matter what operation it executes—either tightening or loosening a fastener as the conventional wrenches do. For a torque wrench equipped with the converting mechanism of the invention to execute the operation of tightening and loosening a fastener, the two ends of the shaft of the torque wrench are both engageable with the rotational output, and one end is to execute the operation of tightening a fastener, the other to execute the operation of loosening a fastener. But this design is cumbersome, it is inconvenient to choose the appropriate output end when using the torque wrench. 
         [0006]    Therefore, it is desired to develop a bidirectional wrench, which is capable of switching the rotation direction of the shaft conveniently. 
       SUMMARY OF THE DISCLOSURE 
       [0007]    In the view of the above, the technical object of the present disclosure is to provide a bidirectional wrench, which can switch the rotational direction of the main shaft conveniently. 
         [0008]    For the above purpose, the present disclosure provides a bidirectional wrench comprising a working part and a handle, the working part comprising a main shaft configured to output torque and having a central axis perpendicular to the handle, a capstan gear mounted on the main shaft, a follower gear mounted on the main shaft, a transmission seat mounted on the main shaft and having a central axis perpendicular to the central axis of the main shaft, and an idle gear mounted on the transmission seat and rotating between the capstan gear and the follower gear. The working part further comprises a first ratchet surface rotating together with the capstan gear, and a second ratchet surface rotating together with the follower gear, a first pawl element and a second pawl element configured to rotate the main shaft. Moreover, the first pawl element has a first pawl and a second pawl that are matched with the first ratchet surface selectively, wherein the first pawl skids on the first ratchet surface in a first direction but engages with the first ratchet surface in a second direction, and the second pawl engages with the first ratchet surface in the first direction but skids on the first ratchet surface in the second direction. In addition, the second pawl element has a third pawl and a fourth pawl that are matched with the second ratchet surface selectively, wherein the third pawl skids on the second ratchet surface in the first direction but engages with the second ratchet surface in the second direction, and the fourth pawl engages with the second ratchet surface in the first direction but skids on the second ratchet surface in the second direction. The working part further comprises a reversing switch configured to set the first pawl element and the second pawl element in a first condition and a second condition, the first pawl and the third pawl are matched with the first ratchet surface and the second ratchet surface, respectively, under the first condition. Further, the second pawl and the fourth pawl are matched with the first ratchet surface and the second ratchet surface, respectively, under the second condition. Moreover, the handle entrains the capstan gear to rotate, and the transmission seat is equipped with a holding device, when holding the holding device and rotating the handle to entrain the capstan gear, the capstan gear entraining the follower gear to rotate reversely via the idle gear. Further, the first direction is clockwise or counterclockwise, the second direction is opposite to the first direction. 
         [0009]    In a further embodiment, the handle has a ring-shaped head, and the first ratchet surface is disposed on an inner circumference of the ring-shaped head. 
         [0010]    In a further embodiment, the first ratchet surface is disposed on an inner circumference of the capstan gear. 
         [0011]    In a further embodiment, the second ratchet surface is disposed on an inner circumference of the follower gear. 
         [0012]    In a further embodiment, the holding device is a holding ring. 
         [0013]    In the further embodiment, the first pawl element is fan-shaped and/or the second pawl element is fan-shaped. 
         [0014]    In a further embodiment, the first pawl element and the second pawl element are mounted on a countershaft having a central axis parallel to but not overlapping the main shaft, the countershaft being in engagement with the main shaft and configured to entrain the main shaft to rotate. 
         [0015]    In a further embodiment, the countershaft drills through the main shaft. 
         [0016]    In a further embodiment, the reversing switch comprises a newel, a first spring-loaded plunger and a second spring-loaded plunger, the newel is disposed inside the main shaft, the first spring-loaded plunger and the second spring-loaded plunger is fixed on the newel in turn, and the first spring-loaded plunger and the second spring-loaded plunger are matched with the first pawl element and the second pawl element, respectively. 
         [0017]    In a further embodiment, springs are disposed inside the first spring-loaded plunger and the second spring-loaded plunger. 
         [0018]    The bidirectional wrench of the present disclosure achieves two working modes between which the wrench can convert conveniently. During the use of the bidirectional wrench of the present disclosure, the input torque that the operator exerts is a clockwise torque or an anticlockwise torque, and the output torque of the output end of the bidirectional wrench of the present disclosure is a clockwise torque or an anticlockwise torque alternatively. 
         [0019]    The present disclosure would be described in detail hereinafter in combination with the attached drawings for better understanding the purpose, features and effects of the present disclosure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1  is a front view of the bidirectional wrench of the present disclosure; 
           [0021]      FIG. 2  is a sectional view of the bidirectional wrench in  FIG. 1 ; 
           [0022]      FIG. 3  shows an exploded view of the driving mechanism in the bidirectional wrench of the present disclosure; 
           [0023]      FIG. 4  shows an exploded view of the reversing mechanism in the bidirectional wrench of the present disclosure; 
           [0024]      FIG. 5  shows the main shaft mounted first pawl element and second pawl element; 
           [0025]      FIG. 6  is a front view of the first pawl element in  FIGS. 4 and 5 ; 
           [0026]      FIG. 7  shows cooperation between the first pawl element and the first ratchet surface when the bidirectional wrench of the present disclosure is on the first working mode; 
           [0027]      FIG. 8  shows the knob for changing working mode of the bidirectional wrench of the present disclosure; 
           [0028]      FIG. 9  shows the blocking device in the bidirectional wrench of the present disclosure; and 
           [0029]      FIG. 10  is a side view of the blocking device in  FIG. 9 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0030]    As shown in  FIGS. 1 and 2 , the bidirectional wrench, which refers to one detailed embodiment of the present disclosure, comprises a handle  20  and a working part  10 , the handle  20  is socketed to the working part  10  across a ring-shaped head  21  (see  FIG. 3 ) through longitudinal extension. Inside the working part  10  is main shaft  100 , outside is a holding ring  102 . One end of the main shaft is an output end  101 , which extends beyond the working part  10  and the head  21  of the handle  20 . The output end  101  can be a component, which is suitable to operate various fasteners like quoin screws, by mounting different sleeves. 
         [0031]    The bidirectional wrench of the present disclosure comprises a driving mechanism coupled to a reversing mechanism, the input torque from the handle  20  is transmitted to the main shaft  100  of the working part  10  through the driving mechanism, and the direction of the output torque from the output end  101  is in a first direction or a second direction, wherein the first direction and the second direction are opposite. Such as, when the input torque of the working part  10  is a clockwise torque or a counterclockwise torque, the output torque of the output end  101  is a clockwise torque, or when the input torque of the working part  10  is a clockwise torque or a counterclockwise torque, the output torque of the output end  101  is a counterclockwise torque. 
         [0032]    The structure of the driving mechanism of the bidirectional wrench of the present disclosure is shown in  FIG. 3 , which comprises a first ratchet surface  311 , a capstan gear  312 , a second ratchet surface  321 , a follower gear  322 , a transmission seat  330 , and idle gears  331 ,  332 . Wherein the first ratchet surface  311  and the capstan gear  312  connect and are coaxial with each other; in this embodiment, the first ratchet surface  311  is disposed in the inner circumference of the ring-shaped head  21  of the handle  20 , the driving engages with the head  21  of the handle  20 , thus the head  21  will drive driving gear to rotate when the handle  20  rotates. In another embodiment, the first ratchet surface  311  can be disposed in the inner circumference of capstan gear  312 ; the second ratchet surface  321  can be disposed in the inner circumference of follower gear  322 . The faces of the first ratchet surface  311  and the second ratchet surface  321  connect with the outer face of the main shaft  100 ; the capstan gear  312  and the follower gear  322  are face-gears, faces of the capstan gear  312  and the follower gear  322  are face-to-face. The first ratchet surface  311 , the second ratchet surface  321 , the capstan gear  312  and the follower gear  322  are coaxial and the central axes thereof overlap in that of the main shaft  100 . 
         [0033]    The transmission seat  330  and the holding ring  102  are fixed together. The idle gear  331 ,  332  are mounted on the transmission seat  330 , which is perpendicular to the main shaft  100 . The idle gears  331 ,  332  are matched between the capstan gear  312  and the follower gear  322 , their teeth engage with the teeth of the capstan gear  312  and the follower gear  322 , respectively. When the holding ring  102  is fixed or the transmission seat  330  is fixed, the capstan gear  312  will drive the follower gear  322  to rotate via the idle gears  331 ,  332 . In this embodiment, the idle gears  331 ,  332  are angle gears. 
         [0034]    The structure of the reversing mechanism of the bidirectional wrench of the present disclosure is shown in  FIG. 4 , comprises a newel  220 , a reversing switch comprising a first spring-loaded plunger  221 , a second spring-loaded plunger  222 , a first pawl element  211 , and a second pawl element  212 . The newel  220  is fixed in the main shaft  100 , the first spring-loaded plunger  221  and the second spring-loaded plunger  222  are fixed on the newel  220 , and the first spring-loaded plunger  221  and the second spring-loaded plunger  222  are perpendicular to the main shaft  100  along the active direction. Preferably, the first spring-loaded plunger  221  and the second spring-loaded plunger  222  have elastic elements such as a spring. The first pawl element  211  and second pawl element  212  are fixed on the main shaft  100  across a countershaft  210 , as shown in  FIG. 5 . The countershaft  210  is parallel to the central axis of the main shaft  100  but does not overlap it, the first pawl element  211  and the second pawl element  212  can rotate round the countershaft  210 . 
         [0035]    The first pawl element  211  and the second pawl element  212  have a similar structure, namely a first fan-shaped pawl, a second fan-shaped pawl and a fan-shaped space between them. Take the first pawl element  211  for example,  FIG. 6  shows the top view of the first pawl element  211  (direction towards the output end  101  along the main shaft  100 ), as can be seen from  FIG. 6 , the first pawl element  211  comprises the first fan-shaped pawl  2111 , the second fan-shaped pawl  2112 , and the fan-shaped space  2110  between them. The fan-shaped face of the first fan-shaped pawl  2111 , the fan-shaped space center section  2110  and the fan-shaped face of the second fan-shaped pawl  2112  constitute the first surface of the first pawl element  211 . The first pawl element  211  also has a second surface which is a special shaped surface and contains a concave section  2113 , which has a first side wall  2114  and a second side wall  2115  in this embodiment. The first side wall  2114  and the second side wall  2115  extend along the main shaft  100 . The first pawl element  211  has a hole  2101 , which is matched with the countershaft  210 , the countershaft  210  fixes the first pawl element  211  on the main shaft across the hole  2101  (see  FIG. 5 ). In this embodiment, the hole  2101  is arranged on the fan-shaped center section  2110  of the first pawl element  211 , preferably, on the center of gravity of the first pawl element  211 . The structure of the second pawl element  212  is similar to the first pawl element  211 , with a thickness less than that of the first pawl element  211  in this embodiment, but in other embodiments, the thickness of the second pawl element  212  can be equal to or more than that of the first pawl element  211 . 
         [0036]    The first surface of the first pawl element  211  and the second pawl element  212  face the first ratchet surface  311  and the second ratchet surface  321 , respectively. Specifically, the teeth of the fan-shaped pawl (which contains the first fan-shaped pawl  2111  and the second fan-shaped pawl  2112 ) of the first pawl element  211  face the teeth of the first ratchet surface  311 , the teeth of the fan-shaped pawl (contains the first fan-shaped pawl and the second fan-shaped pawl) of the second pawl element  212  face the teeth of the second ratchet surface  321 . The second surface of the first pawl element  211  and the second pawl element  212  face the surface of the newel  220 ; specifically, the second surface of the first pawl element  211  faces the ball-head section of the first spring-loaded plunger  221  and the second surface of the second pawl element  212  faces the ball-head section of the second spring-loaded plunger  222 . When the bidirectional wrench of the present disclosure is in the first working mode, the ball-head section of the first spring-loaded plunger  221  connects with the first side wall  2114  of the concave section  2113  of the first pawl element  211 , and the ball-head section of the second spring-loaded plunger  222  connects with the first side wall of the concave section of the second pawl element  212 . When the bidirectional wrench of the present disclosure is in the second working mode, the ball-head section of the first spring-loaded plunger  221  connects with the second side wall  2115  of the concave section  2113  of the first pawl element  211 , and the ball-head section of the second spring-loaded plunger  222  connects with the second side wall of the concave section of the second pawl element  212 . 
         [0037]    When the bidirectional wrench of the present disclosure is in the first working mode, see  FIG. 7 , the teeth of the first fan-shaped pawl  2111  of the first pawl element  211  connect with the teeth of the first ratchet surface  311 ; similarly, the teeth of the first fan-shaped pawl of the second pawl element  212  connect with the teeth of the second ratchet surface  321 . When the head  21  of the handle  20  drives the first ratchet surface  311  to rotate such that the moving direction of the first ratchet surface  311  beside the first fan-shaped pawl  2111  is from the first fan-shaped section  2111  to the second fan-shaped section  2112 , the first ratchet surface  311  rotates clockwise seen in the  FIG. 7 . With the clockwise moving direction, the ball-head section of the first spring-loaded plunger  221  connects with the first side wall  2114  of the concave section  2113  of the first pawl element  211  and the first ratchet surface  311  cannot drive the first pawl element  211  to rotate because the teeth of the first fan-shaped pawl  2111  do not engage with the teeth of the first ratchet surface  311 . However, when the moving direction of the first ratchet surface  311  beside the first fan-shaped pawl  2111  is from the second fan-shaped section  2112  to the first fan-shaped section  2111 , the first ratchet surface  311  rotates counterclockwise seen in the  FIG. 7 . With the counterclockwise moving direction, the ball-head section of the first spring-loaded plunger  221  connects with the first side wall  2114  of the concave section  2113  of the first pawl element  211  and the first ratchet surface  311  can drive the first pawl element  211  to rotate because the teeth of the first fan-shaped pawl  2111  engage with the teeth of the first ratchet surface  311  and the rotation of the first pawl element  211  is transferred to the countershaft  210  through the main shaft  100 , thus driving the main shaft  100  to rotate. 
         [0038]    Meanwhile, when the moving direction of the second ratchet surface  321  beside the first fan-shaped pawl of the second pawl element  212  is from the first fan-shaped section to the second fan-shaped section in the second pawl element  212 , the second ratchet surface  321  rotates clockwise. With the clockwise moving direction, the ball-head section of the second spring-loaded plunger  222  connects with the first side wall of the concave section of the second pawl element  212  and the second ratchet surface  321  cannot drive the second pawl element  212  to rotate because the teeth of the first fan-shaped pawl of the second pawl element  212  do not engage with the teeth of the second ratchet surface  321 . However, when the moving direction of the second ratchet surface  321  beside the first fan-shaped pawl of the second pawl element  212  is from the second fan-shaped section to the first fan-shaped section in the second pawl element  212 , the second ratchet surface  321  rotates counterclockwise. With the counterclockwise moving direction, the ball-head section of the second spring-loaded plunger  222  connects with the first side wall of the concave section of the second pawl element  212  and the second ratchet surface  321  can drive the second pawl element  212  to rotate because the teeth of the first fan-shaped pawl of the second pawl element  212  engage with the teeth of the second ratchet surface  321  and the rotation of the second pawl element  212  is transferred to the countershaft  210  through the main shaft  100 , thus driving the main shaft  100  to rotate. 
         [0039]    Because the drive among the idle gears  331 ,  332 , the capstan gear  312  and the follower gear  322  when the holding ring  102  is fixed, the rotation direction of the second ratchet surface  321  is opposite to the first ratchet surface  311 . It can be seen from this, when the bidirectional wrench of the present disclosure is in the first working mode, the input torque from the working part  10  is a clockwise torque, the first ratchet surface  311  rotate clockwise, and the second ratchet surface  321  rotates counterclockwise. The first pawl element  211  does not engage with the first ratchet surface  311  and the second pawl element  212  engages with the second ratchet surface  321 ; thus, the second pawl element  212  drives the main shaft  100  to rotate counterclockwise and the output torque is a counterclockwise torque. When the input torque from the working part  10  is a counterclockwise torque, the first ratchet surface  311  rotates counterclockwise and the second ratchet surface  321  rotates clockwise. The first pawl element  211  engages with the first ratchet surface  311  and the second pawl element  212  does not engage with the second ratchet surface  321 ; thus, the first pawl element  211  drives the main shaft  100  to rotate counterclockwise and the output torque is a counterclockwise torque. 
         [0040]    When the bidirectional wrench of the present disclosure is in the second working mode, the teeth of the second fan-shaped pawl  2112  of the first pawl element  211  connect with the teeth of the first ratchet surface  311 ; similarly, the teeth of the second fan-shaped pawl of the second pawl element  212  connect with the teeth of the second ratchet surface  321 . When the head  21  of the handle  20  drives the first ratchet surface  311  to rotate such that the moving direction of the first ratchet surface  311  beside the second fan-shaped pawl  2112  is from the first fan-shaped section  2111  to the second fan-shaped section  2112 , the first ratchet surface  311  rotates clockwise. Because the ball-head section of the first spring-loaded plunger  221  connects with the second side wall  2115  of the concave section  2113  of the first pawl element  211 , the first ratchet surface  311  can drive the first pawl element  211  to rotate. The teeth of the second fan-shaped pawl  2112  engage with the teeth of the first ratchet surface  311  and the rotation of the first pawl element  211  is transferred to the main shaft  100  through the countershaft  210 , thus driving the main shaft  100  to rotate. When the moving direction of the first ratchet surface  311  beside the second fan-shaped pawl  2112  is from the second fan-shaped section  2112  to the first fan-shaped section  2111 , the first ratchet surface  311  rotates counterclockwise. Because the ball-head section of the first spring-loaded plunger  211  connects with the second side wall  2115  of the concave section  2113  of the first pawl element  211 , the first ratchet surface  311  cannot drive the first pawl element  211  to rotate and the teeth of the second fan-shaped pawl  2112  do not engage with the teeth of the first ratchet surface  311 . 
         [0041]    Meanwhile, when the moving direction of the second ratchet surface  321  beside the second fan-shaped pawl of the second pawl element  212  is from the first fan-shaped section to the second fan-shaped section in the second pawl element  212 , the second ratchet surface  321  rotates clockwise. Because the ball-head section of the second spring-loaded plunger  222  connects with the second side wall of the concave section of the second pawl element  212 , the second ratchet surface  321  can drive the second pawl element  212  to rotate. Specifically, the teeth of the second fan-shaped pawl of the second pawl element  212  engage with the teeth of the second ratchet surface  321  and the rotation of the second pawl element  212  is transferred to the main shaft  100  through the countershaft  210 , thus driving the main shaft  100  to rotate. When the moving direction of the second ratchet surface  321  beside the second fan-shaped pawl of the second pawl element  212  is from the second fan-shaped section to the first fan-shaped section in the second pawl element  212 , the second ratchet surface  321  rotates counterclockwise. Because the ball-head section of the second spring-loaded plunger  222  connects with the second side wall of the concave section of the second pawl element  212 , the second ratchet surface  321  cannot drive the second pawl element  212  to rotate and the teeth of the second fan-shaped pawl of the second pawl element  212  does not engage with the teeth of the second ratchet surface  321 . 
         [0042]    Because the drive among the idle gears  331 ,  332 , the capstan gear  312  and the follower gear  322  when the holding ring  102  is fixed, the rotation direction of the second ratchet surface  321  is opposite to the first ratchet surface  311 . It can be seen from this, when the bidirectional wrench of the present disclosure is in the second working mode, the input torque from the working part  10  is a clockwise torque, the first ratchet surface  311  rotates clockwise and the second ratchet surface  321  rotates counterclockwise. The first pawl element  211  engages with the first ratchet surface  311  and the second pawl element  212  does not engage with the second ratchet surface  321 ; thus, the first pawl element  211  drives the main shaft  100  to rotate clockwise and the output torque is a clockwise torque. When the input torque from the working part  10  is a counterclockwise torque, the first ratchet surface  311  rotates counterclockwise and the second ratchet surface  321  rotates clockwise. The first pawl element  211  does not engage with the first ratchet surface  311  and the second pawl element  212  engages with the second ratchet surface  321 ; thus, the second pawl element  212  drives the main shaft  100  to rotate clockwise and the output torque is a clockwise torque. 
         [0043]    As previously mentioned, the first working mode and the second working mode of the bidirectional wrench of the present disclosure can be switched and selected via the newel  220 . To be convenient, in this embodiment, as shown in  FIG. 8 , a first end of the newel  220  has a knob  223 , which would be coupled to the newel  220  by embedding two ears (ear  2201  in  FIG. 8 ) of the newel  220  into the knob  223 . In this way, the newel  220  will rotate when turning the knob  223 . In this embodiment, two spines protrude out of the surface of the knob  223 , such as spine  2231 , such that turning the knob  223  can be achieved by putting rotating torque on the two spines, including the spine  2231 . 
         [0044]    The bidirectional wrench of the present disclosure also contains a blocking device, which keeps the bidirectional wrench of the present disclosure on the selected working mode until the operator switches it to the other mode. In  FIGS. 9 and 10 , the blocking device in this embodiment comprises a ball  400  disposed between the output end  101  and a second end of the newel  220  in a groove matched with the ball  400  on the second end of the newel  220 ; more specifically, a first groove  410  and a second groove  420 , the first groove  410  and the second groove  420  are parallel to each other and are separated by the smooth spine. 
         [0045]    When the ball  400  is in the first groove  410 , the ball-head sections of the first spring-loaded plunger  221  and the second spring-loaded plunger  222  maintain contact with the first side wall of the concave section of the first pawl element  211  and the second pawl element  222 , respectively, and the bidirectional wrench of the present disclosure is in the first working mode. When the ball  400  is in the second groove  420 , the ball-head sections of the first spring-loaded plunger  221  and the second spring-loaded plunger  222  maintain contact with the second side wall of the concave section of the first pawl element  211  and the second pawl element  222 , respectively, and the bidirectional wrench of the present disclosure is in the second working mode. When turning the knob  223  to rotate the newel  220  to let the ball  400  move from the first groove  410  to the second groove  420 , the bidirectional wrench of the present disclosure turns from the first working mode to the second working mode. When turning the knob  223  to rotate the newel  220  to let the ball  400  move from the second groove  420  to the first groove  410 , the bidirectional wrench of the present disclosure turns from the second working mode to the first working mode. 
         [0046]    In this embodiment, the transmission seat  330  in in constant engagement with the holding ring  102 . The transmission seat  330  is fixed with respect to the holding ring  102 , thus when the working part  10  rotates with respect to the holding ring  102 , the idle gears  331 ,  332  make the follower gear  322  and the capstan gear  312  rotate in opposite directions. In use, to keep the idle gears  331 ,  332  working and ensure the second ratchet surface  321  and the first ratchet surface  311  rotate in opposite directions, the operator can orientate the transmission seat  330  by holding the holding ring  102 , thus the capstan gear  312  drives the idle gears  331 ,  331  to rotate, and then drives the follower gear  322  to rotate, thereby making the second ratchet surface  321  and first ratchet surface  311  rotate in opposite directions. It should be noted that in other embodiments of the present disclosure, other methods can also be taken to position the transmission seat  330  and thus drive the idle gears  331 ,  332  to work. 
         [0047]    In addition, as described previously, the output end  101  of the bidirectional wrench of the present disclosure can be a component, which is suitable to operate various fasteners such as quoin screws, by mounting various sleeves, and the ball  400  in the blocking device can also be used to block the various sleeves, which are mounted on the output end  101  at this moment. 
         [0048]    What stated above described the preferred embodiment in detail. It should be understood that one with ordinary skill in the art can make many modifications and variations according to the present disclosure without any creative work. Therefore, any modification, equivalent replacement and improvement made to the present disclosure without going beyond the spirit and principle of the present disclosure shall be within the scope of the appended claims.