Patent Publication Number: US-2015075333-A1

Title: Wrench tool for screwdriver bits

Description:
NOTICE OF COPYRIGHT 
     A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to any reproduction by anyone of the patent disclosure, as it appears in the United States Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever. 
     BACKGROUND OF THE PRESENT INVENTION 
     1. Field of Invention 
     The present invention relates to a wrench tool which forces a screwdriver bit to extend a long distance out of a fitting groove of a tool seat by ways of a biasing member so that the screwdriver bit is removed easily. 
     2. Description of Related Arts 
     Referring to  FIGS. 1 and 2 , a conventional wrench tool contains a body  10 , and the body  10  includes a tool seat  11  disposed on one end thereof and having a polygonal fitting groove  111 , the fitting groove  111  has a peripheral slot  112  defined therein for receiving a retainer  12 . When a screwdriver bit  20  with a locking notch  201  is fitted with the fitting groove  111  of the tool seat  11 , the retainer  12  retains with the locking notch  201  of the screwdriver bit  20 , thus positioning the screwdriver bit  20 . However, as desiring to replace a different type of screwdriver bit, a pulling force is forced on the screwdriver  20  by a user and is larger than a retaining force of the retainer  12  so that the retainer  12  disengages from the locking notch  201  of the screwdriver bit  20 , and then the screwdriver bit  20  is removed from the fitting groove  111  of the tool seat  11 . But most part of the screwdriver bit  20  is inserted into the fitting groove  111 , so only the rest part of the screwdriver bit  20  extends out of the fitting groove  111  of the tool seat  11 , thus removing the screwdriver bit  20  difficulty. 
     The present invention has arisen to mitigate and/or obviate the afore-described disadvantages. 
     SUMMARY OF THE PRESENT INVENTION 
     The primary object of the present invention is to provide a wrench tool which forces a screwdriver bit to extend a long distance out of a fitting groove of a tool seat by ways of a biasing member so that the screwdriver is removed easily. 
     Another object of the present invention is to provide a wrench tool which after removing the screwdriver bit, a pressing portion of the biasing member is released so that an elastic element pushes the biasing member to move back to the original position, thus fitting another screwdriver bit with the fitting groove of the tool seat easily. 
     To obtain the above objectives, a wrench tool for screwdriver bits provided by the present invention contains: a body, a biasing member, and an elastic element. 
     The body includes a tool seat received in an end portion thereof, the tool seat includes a fitting groove defined on a first end thereof and fitting with screwdriver bits, the fitting groove has a locking structure for retaining the screwdriver bits, and the tool seat further includes a second end communicating with the fitting groove. 
     The biasing member is secured on the second end of the tool seat, the biasing member has a pushing portion fixed on a first end thereof and extending out of the fitting groove and has a pressing portion disposed on a second end thereof and pressed to push the screwdriver bits. 
     The elastic element is mounted on the second end of the tool seat and used to push the biasing member to move back to an original position. 
     The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross sectional view showing the operation of a conventional wrench tool. 
         FIG. 2  is another cross sectional view showing the operation of the conventional wrench tool. 
         FIG. 3  is a perspective view showing the exploded components of a wrench tool for screwdriver bits according to a preferred embodiment of the present invention. 
         FIG. 4  is a perspective view showing the assembly of the wrench tool for the screwdriver bits according to the preferred embodiment of the present invention. 
         FIG. 5  is a cross sectional view showing the assembly of the wrench tool for the screwdriver bits according to the preferred embodiment of the present invention. 
         FIG. 6  is a cross sectional view showing the operation of the wrench tool for the screwdriver bits according to the preferred embodiment of the present invention. 
         FIG. 7  is another cross sectional view showing the operation of the wrench tool for the screwdriver bits according to the preferred embodiment of the present invention. 
         FIG. 8  is also another cross sectional view showing the operation of the wrench tool for the screwdriver bits according to the preferred embodiment of the present invention. 
         FIG. 9  is still another cross sectional view showing the operation of the wrench tool for the screwdriver bits according to the preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to  FIGS. 3 to 6 , a wrench tool for screwdriver bits according to a preferred embodiment of the present invention comprises a body  30 , the body  30  includes a receiving portion  301  defined on an end portion thereof so as to receive a tool seat  31 , and between the receiving portion  301  of the body  30  and the tool seat  31  is defined a connecting structure. In this embodiment, the connecting structure includes a stepped face  302  formed on the receiving portion  301  of the body  30 , a locking ring  313  fixed around the tool seat  31 , and a stopping loop  303  mounted between the locking ring  313  of the tool seat  31  and the stepped face  302  of the body  30 , such that the locking ring  313  of the tool seat  31  is limited by the stopping loop  303 , the tool seat  31  is fixed and rotated in the receiving portion  301  of the body  30 . Also, between the tool seat  31  and the body  30  is defined a ratchet device, and the ratchet device includes plural peripheral teeth  314  arranged around an outer peripheral wall of the tool seat  31 , a locking block  33  disposed on an inner peripheral wall of the receiving portion  301  of the body  30 , a toothed portion  331  arranged on one end of an outer wall of the locking block  33  so as to engage with the plural peripheral teeth  314  of the tool seat  31 , and a shifting member  34  disposed on the body  30 , wherein the shifting member  34  has an abutting element  341  fixed thereon and a resilient spring  342  for pushing the abutting element  341 , such that the abutting element  341  is biased against the locking block  33 , and the toothed portion  331  of the locking block  33  engages with the plural peripheral teeth  314  of the tool seat  31 , so after the shifting member  34  is switched, the toothed portion  331  of the locking block  33  engages with or disengages from the plural peripheral teeth  314  of the tool seat  31 , thus rotating the body  30 . Preferably, the tool seat  31  includes a rotating disc  315  mounted on a top end thereof and extending out of the receiving portion  301  of the body  30  so as to rotate the tool seat  31 ; the tool seat  31  also includes a polygonal fitting groove  311  defined on a first end thereof and used to fit with screwdriver bits, each having a varying type. The fitting groove  311  has a locking structure fixed therein so as to retain the screwdriver bits, and the locking structure includes a peripheral trench  312  defined in the fitting groove  311  so as to receive a C-shaped retainer  32  for retaining the screwdriver bits, such that the screwdriver bits are retained in the fitting groove  311  securely by the C-shaped retainer  32 . The tool seat  31  further includes a second end communicating with the fitting groove  311 , in this embodiment, the second end of the tool seat  311  has a fixing notch  316  formed therein and communicating with the fitting groove  311  and has a biasing member  35  secured thereon and inserting into the fitting groove  311 . In this embodiment, the biasing member  35  is arranged in the fixing notch  316  of the second end of the tool seat  31 , and the biasing member  35  has a pushing portion  351  fixed on a first end thereof and a spherical pressing portion  352  disposed on a second end thereof. The tool seat  31  also includes an elastic element  36  mounted on the second end thereof, and the elastic element  36  is a spring for pushing the biasing member  35 . In this embodiment, the elastic element  36  is mounted in the fixing notch  316  of the second end of the tool seat  31  so that when the biasing member  35  is pressed, the pushing portion  351  extends out of the fitting groove  311  of the tool seat  31 , thus pushing the screwdriver bits; and when the pressing portion  352  of the biasing member  35  is released, the elastic element  36  pushes the biasing member  35  to move back an original position. To prevent the biasing member  35  from disengaging from the fixing notch  316  of the tool seat  31 , between the fixing notch  316  and the biasing member  35  is defined a limiting structure, and the limiting structure includes a stopping fringe  317  rivet pressed so as to limit the pressing portion  352  of the biasing member  35 . 
     Referring further to  FIG. 7 , in operation, the fitting groove  311  of the tool seat  31  matches with a screwdriver bit  40 , wherein the screwdriver bit  40  has a coupling portion  401  with an engaging recess  402  for fitting with the fitting groove  311  of the tool seat  31 , such that the C-shaped retainer  32  in the fitting groove  311  retains with the engaging recess  402  of the screwdriver bit  40 , thus positioning the screwdriver bit  40  in the fitting groove  311  of the tool seat  31  fixedly. Furthermore, the shifting member  34  of the ratchet device is used to switch an engagement and a disengagement of the toothed portion  331  of the locking block  33  and the plural peripheral teeth  314  of the tool seat  31 , such that when the body  30  is rotated, it has a ratchet function; and before a bolt tool is rotated tightly or after the bolt tool is rotated loosely, the rotating disc  315  of the tool seat  31  is rotated quickly so that the screwdriver bit  40  is driven by the rotating disc  315  to fasten or unfasten the bolt tool, thus removing the bolt tool quickly. 
     As shown in  FIG. 8 , when desiring to remove the screwdriver bit  40 , the pressing portion  352  of the biasing member  35  is pressed so that the biasing member  35  moves in the fixing notch  316  of the tool seat  31 , and the pushing portion  351  of the biasing member  35  pushes the screwdriver bit  40  outwardly, such that the engaging recess  402  of the screwdriver bit  40  disengages from the C-shaped retainer  32  in the fitting groove  311 , thereby forcing the screwdriver bit  40  to extend a long distance out of the fitting groove  311  of the tool seat  31 . As illustrated in  FIG. 9 , after the biasing member  35  pushes the screwdriver bit  40  out of the fitting groove  311 , the screwdriver bit  40  is removed so as to replace another screwdriver bit easily. After removing the screwdriver bit  40 , the pressing portion  352  of the biasing member  35  is released so that the elastic element  36  pushes the biasing member  35  to move back to the original position, thus fitting another screwdriver bit with the fitting groove  311  of the tool seat  31 . 
     While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.