Abstract:
Disclosed is a lever-wrench pliers, which includes a fixed jaw tip that define a mouth and has three clamping faces around the mouth, and a movable jaw that has a jaw tip with a toothed clamping face facing the middle one of the three clamping faces of the fixed jaw tip.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates hand tools and more particularly, to an improved structure of pliers. 
   2. Description of the Related Art 
   A conventional lever-wrench pliers, as shown in  FIG. 1 , comprises a body  1 , a movable jaw  2  pivoted to the body  1 , a lever  3  pivoted to the movable jaw  2 , a toggle lever  4 , which has one end (the fixed end) pivoted to the lever  3  and the other end (the free end) inserted into the inside of the body  1 , an adjusting screw  5  threaded into the bottom side of the body  1  and stopped against the free end of the toggle lever  4 , a spring  7  connected between the body  1  and the movable jaw  2  to hold the movable jaw  2  in the open position relative to the body  1 , and a release lever  6  pivoted to the lever  3  to support the toggle lever  4 . Moving the lever  3  relative to the body  1  controls closing/opening of the movable jaw  3  relative to the body  1 . Rotating the adjusting screw  5  forwards/backwards relative to the body  1  adjusts the moving distance of the toggle lever  4  and the lever  3  so as to further adjust the opening extent between the movable jaw  2  and the body  1  subject to the workpiece  8  to be locked. 
   When pressing the release lever  6 , the toggle lever  4  is lifted to bias the lever  3  relative to the toggle lever  4 , and therefore the movable jaw  2  is turned outwards from the body  1  to release the workpiece  8 . 
   This design of lever-wrench pliers holds the workpiece  8  by clamping the workpiece from two opposite sides. When holding the workpiece  8 , the user must apply much force to the body  1  and the lever  3 . Further, because the teeth of the jaw tip of the body  1  and the teeth of the movable jaw  2  are respectively formed on a respective flat surface, the lever-wrench pliers may slip from the workpiece  8  during operation. 
   Therefore, it is desirable to provide a lever-wrench pliers that eliminates the aforesaid drawbacks. 
   SUMMARY OF THE INVENTION 
   The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a lever-wrench pliers, which can be operated with less effort to grasp the workpiece positively. It is another object of the present invention to provide a lever-wrench pliers, which does not slip from the workpiece during the operation. 
   To achieve these and other objects of the present invention, the lever-wrench pliers comprises a body, the body having a first end and a second end; a fixed jaw tip fixedly provided at the first end of the body; an adjusting screw axially threaded into the second end of the body and forwardly backwardly rotatable relative to the body; a movable jaw pivotally connected to the body corresponding to the fixed jaw tip; a main lever, the main lever having a first end pivotally connected to the movable jaw and a second end terminating in a grip; a toggle lever, the toggle lever having a first end pivotally connected to the main lever and a second end inserted into the body and supported on one end of the adjusting screw; a spring member connected between the movable jaw and the body to force the movable jaw outwards from the body; and a release lever, the release lever having a middle part pivotally connected to the main lever, a first end stoppable against the toggle lever and a second end extending out of the main lever for operation by the user; wherein the fixed jaw tip defines a mouth, having a first clamping face facing one lateral side of the mouth, a second clamping face extending outwards from a top side of the first clamping face and facing a top side of the mouth, and a third clamping face extending obliquely downwards from a bottom side of the first clamping face and facing a lower side of the mouth; the movable jaw has a jaw tip extending toward the mouth, the jaw tip of the movable jaw having a toothed clamping face facing the first clamping face. 
   According to an alternate form of the present invention, the movable jaw is pivotally connected to the body through a slip joint so that the lever-wrench pliers can be used for turning the workpiece with a socket or tool member in one single direction. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a plain view of a lever-wrench pliers according to the prior art. 
       FIG. 2  is an elevational assembly view of the combination cabinet according to the present invention. 
       FIG. 3  is a plain view showing the closed status of a lever-wrench pliers according to the present invention. 
       FIG. 4  is a schematic drawing showing the lever-wrench pliers grasped a hexagonal nut according to the present invention. 
       FIG. 5  is an elevational view of socket for use with the lever-wrench pliers according to the present invention. 
       FIG. 6  is a schematic plain view showing the lever-wrench pliers grasped the socket according to the present invention. 
       FIG. 7  is a schematic drawing showing the forward turning operation of an alternate form of the lever-wrench pliers according to the present invention. 
       FIG. 8  corresponds to  FIG. 7 , showing the backward turning operation of the lever-wrench pliers. 
       FIG. 9  is an elevational view of a tool member for use with the lever-wrench pliers according to the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIGS. 2 and 3 , a lever-wrench pliers in accordance with the present invention is shown comprising: 
   a body  10 , which has a first end  11 , a second end  13 , and a hollow grip  15  connected between the first end  11  and the second end  13 ; 
   a jaw tip  12  affixed to the first end  11  of the body  10  with a fastener  111 ; 
   an adjusting screw  14  axially threaded into the second end  13  of the body  10 ; 
   a movable jaw  20  pivotally connected to the body  10  with a pivot  21  adjacent to the first end  11  and forwardly backwardly turnable relative to the jaw tip  12 ; 
   a lever  30 , which has a first end  31  pivotally connected to the movable jaw  20  with a pivot  33  and a second end terminating in a grip  32 ; 
   a toggle lever  34 , which has a first end  341  pivotally connected to the lever  30  with a pivot  343  and a second end  342  inserted into the hollow grip  15  of the body  10  and supported on the end of the adjusting screw  14 ; 
   a spring member  36  connected between the movable jaw  20  and the body  10  to force the movable jaw  20  apart from the jaw tip  12  of the body  10 ; and 
   a release lever  37 , which is pivotally connected with a middle part thereof to the lever  30  with a pivot  373 , having a first end  371  stoppable against the toggle lever  34  and a second end  372  extending out of the grip  32  of the lever  30  for pressing by the user. 
   The jaw tip  12  defines a mouth  40 , having a first clamping face  41  facing one lateral side of the mouth  40 , a second clamping face  42  extending outwards from the top side of the first clamping face  41  and facing the top side of the mouth  40 , and a third clamping face  43  extending obliquely downwards from the bottom side of the first clamping face  41  and facing the lower side of the mouth  40 . The first clamping face  41  and the second clamping face  42  define a 120-degree contained angle. The second clamping face  42  and the third clamping face  43  define a 120-degree contained angle. The movable jaw  20  has a jaw tip  50  extending toward the mouth  40 . The jaw tip  50  has a toothed clamping face  51  facing the first clamping face  41 . 
   Referring to  FIG. 2  again, when the lever-wrench pliers is closed, the toggle lever  34  is stopped against the first end of the release lever  37 . At this time, the adjusting screw  14  is rotated forwards and stopped against the second end  342  of the toggle lever  34 . At this time, the jaw tip  50  of the movable jaw  20  is received in the mouth  40 . 
   Referring to  FIG. 3 , when wishing to open the lever-wrench pliers, rotating the adjusting screw  14  backwards to adjust the angular position of the toggle lever  34  relative to the lever  30 , so as to set the size of the mouth  40  between the first clamping face  41  and the toothed clamping face  51 . 
     FIG. 4  shows the lever-wrench pliers grasped a hexagonal nut  90 . As illustrated, the second clamping face  42  and third clamping face  43  are respectively clamped on two distal sides of the hexagonal nut  90 , and the toothed clamping face  51  of the jaw tip  50  is clamped on the other distal side of the hexagonal nut  90 , i.e., the lever-wrench pliers clamps the hexagonal nut  90  from three sides. Therefore, the user can grasp the hexagonal nut  90  with the lever-wrench pliers positively with less effort. 
   The lever-wrench pliers of the present invention can be used with a specially designed socket  92  as shown in  FIG. 5 . The socket  92  has two coupling holes  94  respectively formed in the two distal ends, and a ratchet section  93  on the middle. 
   Referring to  FIG. 6 , when grasped the socket  92  with the lever-wrench pliers, the second clamping face  42  and third clamping face  43  of the jaw tip  12  the toothed clamping face  51  of the jaw tip  50  are respectively clamped on the hexagonal nut  90  from three different sides, at this time the user can turn the hexagonal nut  90  with the lever-wrench pliers positively. 
   The lever-wrench pliers can be so made that the jaw tips  12  and  50  can be controlled to rotate the socket  90  in one single direction, i.e., the movable jaw  20  is pivotally connected to the body  10  through a slip joint. As shown in  FIG. 7 , the movable jaw  20  has a through hole  22  that receives the pivot  21 , which is fixedly fastened to the body  10 . The diameter of the through hole  22  is greater than the pivot  21 . When turning the lever-wrench pliers in direction A as shown in  FIG. 7 , the toothed clamping face  51  of the jaw tip  50  of the movable jaw  20  is forced against the ratchet section  93  of the socket  92  to push the socket  92  toward the second clamping face  42  and third clamping face  43  of the jaw tip  12 , thereby causing the socket  90  to be turned with the lever-wrench pliers. On the contrary, when turning the lever-wrench pliers in the reversed direction B as shown in  FIG. 8 , the toothed clamping face  51  of the jaw tip  50  of the movable jaw  20  is released from the ratchet section  93  of the socket  90 , and therefore the socket  90  is disengaged from the second clamping face  42  and third clamping face  43  of the jaw tip  12 , i.e., the lever-wrench pliers runs idle in this direction. 
     FIG. 9  shows a tool member  95  for use with the lever-wrench pliers according to the present invention. As illustrated, the tool member  95  has a ratchet section  951  on the middle, a first tip, for example, a Phillips head tip  952  at one end, and a second tip, for example, a cabinet tip  953  at the other end. The tool member  95  can be used with the lever-wrench pliers in the same way as the use of the aforesaid socket  90 . 
   Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.