Abstract:
The present invention discloses a wrench having an opening that fits different sizes of screwing and unscrewing objects such as bolts and nuts, and such wrench comprises a main body having a first clipping member and a second clipping member along the axis of the main body and being disposed on at least one of its ends, the first and second clipping members enclose an opening, and the lateral sides of the enclosed opening is for clipping and driving the external diameter of the bolts or nuts characterized in that the length of the front end of the first clipping member is longer than the that of the second clipping member, and a first blocking recession showing a pair of symmetric obtuse angles is disposed at the lateral side adjacent to the opening. The second clipping member maintains in position of being elastically clipped to the lateral side of the opening, and a second recession having an obtuse angle at its front end, and a restricted positioning portion for adjusting the position with a predetermined angle being disposed at the rear end. A mechanical member for restricting the axial displacement is disposed at the rear end of the restricted positioning portion in order to provide the restriction for position after the axial angle of the clipping for the first clipping member is adjusted. Therefore the size of the opening is changed by the automatic adjustment of axial angle of the second clipping member. By the axial displacement of the mechanical members, it quickly releases or presses against the restricted positioning portion, and thereby attains the effect of fast clipping action for a wrench that fits different size of bolts and nuts.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to a wrench, and more particularly to a wrench that is easy to operate and its opening is able to fit in different sizes of bolts and nuts.  
           [0003]    2. Description of the Related Art  
           [0004]    In FIG. 1, it shows a traditional open wrench that has two different opening with dimensions according to the specification of the working object such as a bolt. The two different sized rotary clipping heads (usually one side is odd in number and the other even). Generally, the user has to prepare a set of wrenches with various sizes at a time when he is at work in order to screw or unscrew different bolts and nuts. Therefore, these tools are usually sold as a package. One can imagine how heavy these tools are and how troublesome to carry such package around. Furthermore, when these tools are used, the user has to find the right size wrench first to fit the bolts or nuts, and then screws or unscrews them. When the object is screwed to a certain angle, the user has to take the wrench out from the object, and then start another round by placing the open wrench onto the object again. After many back and forth motions, the users can fix the object in position. It wastes a lot of time, and in particularly it is more troublesome for the deep screwing.  
           [0005]    In summation of the above description, the inventor bases on years of his experience in this field to conduct research on a simple-to-use and convenient wrench to solve the problems and break through the bottlenecks of the traditional open wrench structure.  
         SUMMARY OF THE INVENTION  
         [0006]    The primary objective of the present invention is to provide an open wrench that fits different sizes of bolts and nuts having an improved structure that can accommodate all sizes of bolts and nuts by its open end, such that it is unnecessary to remove the open wrench from the bolts or nuts from time to time in the process of screwing and unscrewing.  
           [0007]    Another objective of the present invention is to provide an open wrench that fits different sizes of bolts and nuts having an improved structure that it is not necessary to remove the open wrench from a bolt or a nut and place the wrench back to an original holding angle before it starts to rotate again, and such arrangement makes the operation of screwing and unscrewing easier and simpler.  
           [0008]    According to the present invention of an open wrench capable of screwing and unscrewing objects of different sizes, it comprises a main body, and a first clipping member and a second clipping member being separately disposed on at least one end in the axial direction of the main body, and an opening formed by enclosure of the first clipping member and the second clipping member and the lateral side of such opening capable of accommodating the external diameter of the bolts and nuts, characterized in that the front end section of the first clipping member is longer than that of the second clipping member, and a first restricted concession having two obtuse angles separately disposed on the lateral sides adjacent to the opening, and the second clipping member maintains in the position of being elastically clipped to the lateral side of the opening, and a second recession having an obtuse angle at its front end, and a restricted positioning portion for adjusting the position with a predetermined angle being disposed at the rear end, and a mechanical member for restricting the axial displacement is disposed at the rear end of the restricted positioning portion in order to provide the restriction for position after the axial angle of the clipping for the first clipping member is adjusted, and therefore the size of the opening is changed by the automatic adjustment of axial angle of the second clipping member, and by the axial displacement of the mechanical members, it quickly releases or presses against the restricted positioning portion, and thereby attains the effect of fast clipping action for a wrench that fits in different size of bolts and nuts.  
           [0009]    To make it easier for our examiner to understand the objective of the invention, its structure, innovative features, and its performance, we use a referred embodiment together with the attached drawings for the detailed description of the invention.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0010]    Other objects, features, and advantages of the invention will become apparent from the following detailed description of the preferred but non-limiting embodiment. The description is made with reference to the accompanying drawings, in which:  
         [0011]    [0011]FIG. 1 is a three-dimensional diagram of the traditional open wrench.  
         [0012]    [0012]FIG. 2 is a three-dimensional diagram showing the disassembled parts of a preferred embodiment of the present invention.  
         [0013]    [0013]FIG. 3 shows a transversal cross-section of a preferred embodiment of the present invention.  
         [0014]    [0014]FIG. 4 shows a longitudinal cross-section of a preferred embodiment of the present invention.  
         [0015]    [0015]FIG. 5 is a schematic diagram A showing the motion of a preferred embodiment of the present invention.  
         [0016]    [0016]FIG. 6 is a schematic diagram B showing the motion of a preferred embodiment of the present invention.  
         [0017]    [0017]FIG. 7 is a planar illustrative diagram A of a preferred embodiment of the present invention.  
         [0018]    [0018]FIG. 8 is a planar illustrative diagram B of a preferred embodiment of the present invention.  
         [0019]    [0019]FIG. 9 is a planar illustrative diagram C of a preferred embodiment of the present invention.  
         [0020]    [0020]FIG. 10 is a three-dimensional diagram of the disassembled parts of the preferred embodiment of the present invention.  
         [0021]    [0021]FIG. 11 is a traversal cross-sectional diagram of another preferred embodiment of the present invention.  
         [0022]    [0022]FIG. 12 illustrates the motion of another preferred embodiment of the present invention.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0023]    Please refer to FIGS. 2 and 3. The present invention is an open wrench that fits different sizes of screwing and unscrewing objects, comprising a main body  10 , and a first clipping member  11  and a second clipping member  12  being disposed at the axial direction of both ends of the main body  10 , and the corresponding opposite sides of the two clipping members  11 ,  12  enclose an opening  13  for accommodating the external diameter of a hexagonal nut  20  or bolt and clipping them to rotate. The first clipping member  11  extends from the main body  10  in a fixed position, and the length of its front end is longer than that of the second clipping member  12 . A first restricted concession  111  having two obtuse angles separately disposed on the lateral sides adjacent to the opening  13 , and the second clipping member  12  maintains in the position of being elastically clipped to the lateral side of the opening  13  of the main body  10 , and the lateral side of its front tip has a circular blocking flange  121  to increase the reliability of the clipping force for clipping the external diameter of bolts or nuts. There is a clipping slot  122  at the side of pivotal interior of the second clipping member  12 , which has a U-shaped elastic member  123 . The end  124  of the U-shaped elastic member  123  being grasped by the front sidewall  101  of the main body  10  such that the second clipping member  12  constantly leans against the first clipping member  11 . There is a second restricted recession  125  having an obtuse-angled opening at the front end of the second clipping member  12 . A serrated latch  126  being disposed at the side of the rear end is assembled with the curved surface at the front end of the serrated gear  141  by the serrated latch  126  and a blocking member  14  of the blocking mechanism  10 A being assembled to the serrated gear  141  in order to provide a blocking for the positioning after the angle of pivotal expansion of the second clipping member  12 . The axial rear end of the blocking member  14  is coupled to a push rod  15 , and such push rod  15  passes through the hole  103  of the rib  102  of the main body  10  of the wrench, and the external portion of the push rod  15  being sheathed with a spring  151 . Both ends of the spring  151  lie between the sidewall of the rib member  102  and the rear wall of the blocking member  14 , and the axial rear end of the push rod  15  being pivotally coupled to a driving member  16 . The driving member  16  is disposed in the concave compartment  104  inside the main body  10  of the wrench, and each of its lateral sides has an outwardly inclined driving slot  161 , and the internal side of the end of the push rod  15  is disposed on top of the driving member  16 , and a bolt  152  passes trough the insert hole  153  of the push rod  15  in such way that the lower portion of the bolt  152  extends into the driving slot  161 , and the inclination of the driving slot  161  makes the driving member  16  back and forth and carries the bolt  152  to move accordingly and results in a horizontal displacement for the push rod. The vertical side of the driving member  16  has a protruding ear  162  being coupled to a push button  17 , and the push button being exposed to the external wall of the main body  10  of the wrench for us to push. There is a spring  171  being pivotally mounted onto the push button  17  at the axial direction, and the other end of the spring  171  presses against the internal wall of the main body  10  of the wrench.  
         [0024]    During assembling, the driving member  16  is installed in the concave compartment  104  of the main body  10  of the wrench first, and the axial rear portion of the push button  17  is sheathed with the spring  171  making the rear end to press against the internal wall of the main body  10  of the wrench. The push rod  15  passes through the hole  103  of the rib member  102  of the main body  10  of the wrench, and the internal side of the push rod  15  is disposed on the upper section of the driving member  16 . After using the bolt to passes the push rod  15  into the insert hole  153 , the lower portion of the bolt penetrates deeply into the driving slot  161  of the driving member  16 , and the other end of the push rod  15  being sheathed with a spring  151 , and then the external portion of the push rod  15  is mounted to the blocking member  14 . The serrated gear  141  disposed on the external end surface of the blocking member  14  is embedded with the serrated latch  126  at the internal sidewall of the second clipping member  12 . The second clipping member  12  is pivotally mounted to the main body  10  of the wrench by an axial post  105  and is being adjacent to the side end of the opening  13 . A U-shaped elastic member  123  is being disposed in the clipping slot  122  pivotally mounted on the lateral side of the second clipping member  12  such that the end  124  of the U-shaped elastic member  123  is clipped at the front sidewall of the main body  10  of the wrench and the second clipping member  12  constantly press against the first clipping member  11 . A lid panel  106  seals the upper section of the main body  10  of the wrench, and a combined assembly of four bolts  107  passes through the bolt hole  108  of the main body  10  of the wrench to form a whole piece.  
         [0025]    Please refer to FIG. 4 for the application of the wrench according to the present invention. When pressing the push button by a hand, we can push the driving member  16  to displace towards the rear sidewall of the concave compartment  104 , and the driving slot  161  makes the push rod  15  and the bolt  152  in its interior to change their positions according to the inclination of the driving slot  161  and to displace towards the middle line of the driving member  16 , so that the push rod  15  being coupled to the bolt  152  will be pulled towards the center of the driving member  16 . At the meantime, the push rod  15  carries the blocking member  14  to move such that the serrations  141  of the blocking member  14  are separated from the serrated latch  126  of the second clipping member  126 , and the second clipping member  12  can freely move back and forth. Therefore, it allows the first clipping member  11  and the second clipping member  12  to accommodate the corresponding opposite sides of a hexagonal bolt or nut  20  and makes the flange  121  of the second clipping member  12  to rotate outward to clip the bolt or nut  20 . Furthermore, due to the resuming force given by the U-shaped elastic member  123  in the clipping slot  122  of the second clipping member  12 , the wrench can immediately clip the bolt or nut as shown in FIG. 5. Once our hand releases the push button as shown in FIG. 2, then the spring  171  at the rear section of the rod body of the push button  17  immediately resumes the driving member  16  back into the original position. Due to the end of the internal side of the bolt  152  of the push rod  15  follows the moving of the driving slot  161  to move outward, and the spring  151  sheathed on the external side of the push rod  15  will resume and quickly push the blocking member  14  outward and let the serrated gear  141  on the external side of the blocking member  14  quickly embed into the serrated latch  126  of the second clipping member  12 . It also fixes the second clipping  12  in position so that it cannot rotate freely.  
         [0026]    We can rotate the wrench, and the main body will tightly screw or unscrew the bolt or nut  20 . Please refer to FIG. 6. When the bolt  20  is rotated in clockwise direction, the flanges  121  of the first clipping member  11  and the second clipping member  12  of the main body  10  of the wrench can tightly attach the corresponding opposite sides of a bolt or nut. Since the distance L 1  between the vertex  2  of the bolt  20  to the vertex  4  of the bolt  20  is smaller than the distance L 2  between the vertex  2  of the bolt  20  to the tangential contact point T of the flange  121  of the second clipping member  12 , and the distance L 3  between the vertex  2  of the bolt  20  to the vertex  5  of the bolt  20  is larger than the distance L 2  between the vertex  2  of the bolt  20  to the tangential contact point T of the flange  121  of the second clipping member  12 , therefore when we rotate the wrench, the opening formed by the corresponding side of the first clipping member  11  and the second clipping member  12  will not slide across the vertex point  2  of the bolt  20  when the wrench rotates clockwise. It will directly drive the bolt  20  to rotate clockwise as shown in FIG. 7. When the wrench is rotate clockwise to a specific angle, the main body  10  of the wrench must return to the original position, therefore the main body  10  can rotate counter-clockwise back to the original angle without driving the bolt  20 . It is mainly because the distance L 1  is smaller than the distance L 2 . When the clipping distance (i.e. the distance from vertex  2  to the flange tangential contact point T) of the opening formed by the flanges  121  of the first clipping member  11  and the second clipping member  12  the main body  10  of the wrench is larger than the distance between vertex  2  to vertex  4  of the bolt  20 , the tangential contact point T of the flange  121  of the second clipping member  12  can slide across the vertex  4  of the bolt  20  when the wrench is rotated counter-clockwise as shown in FIG. 8. Therefore, when the wrench is rotated backward, it will not carry the bolt to rotate, but slide across the vertices of the bolt  20  and let the main body of the wrench return to the original driving position and allow the different corresponding opposite sides of the bolt lean against the sides of the opening for second round of rotation. Every time when the main body  10  of the wrench returns to its position of original angle, the user needs not to separate the wrench from bolt  20  to continuously perform a clockwise rotation and a counter-clockwise rotation alternatively for screwing or unscrewing a bolt  20  or a nut in a quick manner.  
         [0027]    It is worth to mention that the present invention practically can accommodate bolts  20  of different sizes without switching to the other wrench with different sized opening. The structure can clip the corresponding opposite sides of the bolt  20  mainly based on the pivotal coupling of the second clipping member  12  with the main body  10  of the wrench, and by the elastic support of the U-shaped elastic member  123  disposed at its top constantly press the second clipping member  12  towards the first clipping member  11 . Even a very small size of the bolt  20  can fit in the open wrench as far as it can be stuck into the opening enclosed by the first clipping member  11  and the second clipping member  12 . This key point has broken through the shortcomings of the traditional wrench. Furthermore, the conventional wrench has to fit the size of bolts and nuts, and therefore wrenches of different sizes come with bolts or nuts of different sizes, and the user has to carry lots of wrenches. In addition, the present invention also solves the problem of the convention wrench, which needs to separate wrench from the bolt or nut after the wrench is rotated to a specific angle. The wrench has to put into the bolt or nut again for each round of rotation for the screwing or unscrewing. It has to be done repeatedly and hence wastes lots of time.  
         [0028]    Furthermore, please refer to FIGS.  10  to  12 , which introduce another embodiment of the present invention. As shown in the figures, a wrench that fits in different sizes of screwing and unscrewing objects such as bolts and nuts is the same as of the previous example including a main body  10 , and a first clipping member  11   a  and a second clipping member  12   a  being disposed at the axial direction of both ends of the main body  10 , and the corresponding opposite sides of the two clipping members  11   a,    12   a  enclose an opening  13  for accommodating the external diameter of a hexagonal nut  20  or bolt and clipping them to rotate. The slight difference in mechanical parts mainly lies on that the second clipping member  12   a  is axially coupled to another side of the structure that changes its rear end and extends a rotary arm  122   a  and converts to another blocking mechanical member  30  as shown in the following embodiment.  
         [0029]    Please refer to FIG. 10 and FIG. 11, of which the blocking mechanical member  30  comprises a hooked button  31  being coupled to the main body  10  for finger pressing. The inner side of the hooked button  31  has a suppressing section  311  to suppress against the lateral end of the backside of a rectangular suppressing board  32 , and the suppressing board  32  has an recession  321  on the face to accommodate a spring  33  and press against one end of the spring  33 . The other end of the spring  33  presses against the inner wall of the main body  10  of the wrench. The end of the suppressing board  32  proximate to the lateral side of the second clipping member  12   a  is clipped to the inner wall groove  15   a  of the main body of the wrench, and a hole  322  being located at the outer end of said suppressing board  32 . The front wall of the main body  10  of the wrench corresponding to the position of the hole  322  has a hole  16   a  for a push rod  34  to pass through, and after such push rod  34  passes through the hole  322  of the suppressing board  32 , its end presses against an inner wing  351  of a stopping element  35 . Such stopping element  35  is pivotally coupled to the axial post  18   a  of the main body  10  and the axial post  18   a  being serially coupled to an elastic member  36 . The front end  361  of the elastic member  36  supports the protruding section  18   a  at the lateral side of the inner wall of the main body  10  or the wrench, and its end  362  presses against the middle of the inner wing  351  of the stopping element  35 . The stopping element adjacent to the opening  13   a  of the main body  10  of the wrench has an outer side wing  352  and makes its sidewall to lean against the edge at the end of a rotary arm  122   a  extended from the rear side of the second clipping member  12   a.    
         [0030]    In FIG. 11, by the foregoing structure, the hook button  31  will not be exerted under force, and the suppressing board  32  will prop due to the elasticity of the spring  33 , and its inner side end pushes towards the suppressing section  311  of the hooked button  31 , but the hole  322  at the external side passes through the end of the pus rod  34 , and makes the periphery of the push rod  34  to be fixed to a position and no longer can contract or expand by the slant ringed wall of the hole  322 . Therefore, the stopping element  35  propped by the end of the push rod  34  also cannot rotate back freely. In other words, the stopping element  35  is fixed into a position, and the rotary arm  122   a  of the second clipping member  12   a  at the front of the outer wing  352  of the stopping element  35  is fixed by the stopping element  35  and not be able to rotate back in the counterclockwise direction. The blocking flange  121   a  of the second clipping member tightly presses against the screw bolt  20  and it does not allow any extension towards the counterclockwise direction, and hence can clip the hexagonal bolt by the two lateral sides of the wrench.  
         [0031]    Please refer to FIG. 12. If we try to enlarge the distance between the second clipping member  12   a  and the first clipping member  11   a  in order to facilitate the clipping of a large size bolt, we need to press the hooked button  31  by one hand and let it displace to a side, then the hooked button  31  located inside the suppressing section of the main body  10  of the wrench will be facing and leaning against the inner wall surface of the main body of the wrench, and it will press make the recession  321  of the suppressing board  32  to compress the spring  33 . When the suppressing board  32  is in horizontal position, the edge wall of its hole is parallel to the axis of the periphery wall of the push rod  34 . When our finger presses the push rod  34  towards the main body, and its end presses against the inner wing  351  of the stopping element  35  thereby the stopping element  35  will rotate back in counterclockwise direction. Then the outer wing  352  of the stopping element  35  suppresses the side wall of the rotary arm  122   a  at the rear end of the second clipping member  12   a  and let the second clipping member  12   a  block the protruding flange  121   a  moves towards the first clipping member  11   a,  and hence it can clip the bolts of small size. On the contrary, if one wishes to clip a larger size of bolt, then one should pull the push rod  34  out, and the stopping element  35  will resume its position by the elastic member  35 , and its inner wing will rotate to an angle in clockwise direction, and the outer wing will rotate simultaneously in clockwise direction. The second clipping member will extend back outward in clockwise direction by the rotary arm  122   a  in a distance. Meanwhile, it lets the blocking of the protruding flange  121   a  extend outward and makes the hexagonal bolt  20  to slide into the opening between the protruding flange and the first clipping member  11   a . As soon as the hooked button  31  is released, it immediately props the inner end of the suppressing board  32  by the elastic tension of the spring  33 , and supports the suppressing section  311  of the hooked button  31 , and tilts the suppressing board  32  to an angle for fixing into the position. The hole  322  of the suppressing board  32  is embedded into the tilted periphery wall and the periphery of the push rod  34 , and thereby the push rod  34  is fixed into a position, then the end of the push rod props against the inner wing  351  of the stopping element  35 , and makes the outer wing  352  incapable of rotating back in counterclockwise direction. The rotary arm  122   a  of the second clipping member  12   a  is latched by the outer wing  352  and not able to rotate back in clockwise direction, such that the second clipping member  12   a  cannot extend outward, and hence it clips the bolt  20 . Hence, it attains the purpose of tightly screwing or unscrewing a bolt and a nut by rotating the main body  10  of the wrench.  
         [0032]    It is worth to mention that the second clipping member  12   a  of the present invention moves towards the first clipping member  11   a  to adjust the size of the bolt  20 . Such operation completely relies on the pushing or pulling of the push rod  34  to control the rotary angle of the outer wing  35  of the stopping element  35 . It relatively makes the outer side of the second clipping member  12   a  blocks the protruding flange  121   a  and presses it inward with no increments and leans against the first clipping member  11   a  or extends outward to clip different sizes of bolts  20 . Such design can be used in different specification of bolts and nuts, and most importantly it is very simple and easy to operate as well as saving time.  
         [0033]    Therefore in summation of the above description, the present invention herein enhances the performance of the conventional wrench structure and further complies with the patent application requirements and is submitted to the Patent and Trademark Office for review and granting of the commensurate patent rights.  
         [0034]    While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.