Patent Publication Number: US-8534166-B2

Title: Screwdriver device for an inherent tool bit set

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a screwdriver, more particularly to a screwdriver device for an inherent tool bit set which a tool bit set is accommodated in a screwdriver device. 
     2. Description of Related Art 
     Screwdrivers are ordinary and widely using in houses and factories. People often assemble and fix things by using screwdrivers. Day after day, many manufacturers work hard not only to improve the quality of screwdrivers but to produce more functional screwdrivers. Thus, people can choose and use various screwdrivers to attach or to detach things easily today. 
     A conventional screwdriver includes an operating handle, a shaft fixed to the operating handle, and a tool bit extended from the shaft. A tool bit has particular structure and size corresponding to a particular bolt or a particular nut. If people want to screw bolts with different size and structure, or nuts with different size and structure, various screwdrivers are necessary in the task. In order to make users more convenient, some screwdrivers have a series of shafts with different tool bits that are assembled to the operating handle freely. However, users need a tool box to receive the various screwdrivers or a series of shafts. The tool box not only costs the users money but occupies the space in their houses. 
     The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional. 
     SUMMARY OF THE INVENTION 
     The main objective of the present invention is to provide an improved screwdriver to accommodate a tool bit set for saving space and cost. 
     To achieve the objective, a screwdriver for an inherent tool bit set comprises a screwdriver device having an accommodating portion at one end thereof, a plurality of accommodating rooms formed on the accommodating portion for receiving a tool bit set, at least one spring room deposited on the accommodating portion, a working shaft at another end of the screwdriver device, a cover member having a receiving space at one end thereof for receiving the accommodating portion of the screwdriver device, at least one through hole opened on the cover member, the through hole communicated with the receiving space and corresponding to the spring room, at least one control set assembled between the spring room and the through hole, wherein a user presses the control set into the spring room for separating the cover member from the screwdriver device and takes a tool bit to assemble to the working shaft for screwing or loosing bolts, the control set further comprising a spring and a driving block, the spring being set between the spring room and the driving block, thereby the cover member is separated from the screwdriver device when the driving block is pressed through the through hole completely and the spring is compressed into the spring room simultaneously, at least one button room being set on the cover member, the button room communicated with the through hole, an elastic member placed into the button room, a pushing block formed at one end of the elastic member and corresponding to the through hole, the pushing block against and above the driving block, at least one locking hole opened on the button room, a button shield assembled to the button room and above the elastic member, at least one finger deposited at the button shield, wherein the finger is locking into the locking hole, a button formed on the elastic member and above the pushing block, a button hole opened on the button shield, wherein the button is received through the button hole, at least one lock portion formed on the walls of the accommodating rooms for receiving the tool bit firmly, a floor extended from a bottom of the accommodating rooms, the tool bit set received at an exact depth in the accommodating rooms through the floor, a spring fastener deposited at a terminal of the accommodating portion, a rear spring placed on the spring fastener and resisting against a bottom of the receiving space, two hook portions deposited at two lateral sides of the accommodating portion, two tracks deposited at two sides and along the walls of the receiving space, the two tracks corresponding to the two hook portions respectively. 
     Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded view of a screwdriver device for an inherent tool bit set in accordance with the present invention; 
         FIG. 2  is an assembled view of the screwdriver device for an inherent tool bit set in accordance with the present invention; 
         FIG. 3  is a cross-sectional view of the screwdriver device for an inherent tool bit set along a line AA shown in  FIG. 2 ; 
         FIG. 4  is a cross-sectional view of the screwdriver device for an inherent tool bit set along a line BB shown in  FIG. 2 ; 
         FIG. 5  is a partial assembled view for showing a user pressing two buttons of the present invention; 
         FIG. 6  is a partial assembled view for showing a cover member being taken off from a screwdriver device in the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to the drawings to  FIGS. 1-4 , a screwdriver for an inherent tool bit set in accordance with the present invention comprises a screwdriver device  1 . The screwdriver device  1  has an accommodating portion  11  at one end thereof. A plurality of accommodating rooms  12  are formed on the accommodating portion  11  for receiving a tool bit set  41 . At least one lock portion  121  is formed on the walls of the accommodating rooms  12  for receiving a tool bit within the tool bit set  41  firmly. A floor  122  is extended from a bottom of the accommodating rooms  12  as showing in  FIG. 3 , wherein the tool bit set  41  are received at an exact depth in the accommodating rooms  12  through the floor  122 . Two hook portions  13  are deposited at two lateral sides of the accommodating portion  11 . At least one spring room  14  is deposited on the accommodating portion  11 . A spring fastener  15  is deposited at a terminal of the accommodating portion  11 , wherein a rear spring  16  is placed on the spring fastener  15 . The screwdriver device  1  has a working shaft  17  at another end thereof. Each of tool bit within the tool bit set  41  is assembled to one end of the working shaft  17  alternatively. 
     A cover member  2  has a receiving space  21  at one end thereof for receiving the accommodating portion  11  of the screwdriver device  1 . Two tracks  22  are deposited at two sides and along the walls of the receiving space  21 , wherein the two tracks  22  are corresponding to the two hook portions  13  respectively. The rear spring  16  placed on the spring fastener  15  is resisting against a bottom in the receiving space  21 . At least one through hole  23  is opened on the cover member  2 , wherein the through hole  23  is communicated with the receiving space  21  and corresponding to the spring room  14 . At least one button room  24  is set on the cover member  2  (Here are two button rooms  24  in the present invention.). The button room  24  is communicated with the through hole  23 . At least one locking hole  241  is opened on the button room  24 . An elastic member  25  is placed into the button room  24 . A pushing block  251  is formed at one end of the elastic member  25  and corresponding to the through hole  23 . A button  252  is formed on the elastic member  25  and above the pushing block  251 . A button shield  26  is assembled to the button room  24  and above the elastic member  25 . At least one finger  261  is deposited at the button shield  26 , wherein the finger  261  is locking into the locking hole  241 . A button hole  262  is opened on the button shield  26 , wherein the button  252  is received through the button hole  262 . 
     At least one control set  3  is assembled between the spring room  14  and the through hole  23  (Here are two control sets  3  in the present invention.). The control set  3  further comprises a spring  31  and a driving block  32 . The driving block  32  is placed into the through hole  23 , wherein the pushing block  251  of the elastic member  25  is against and above the driving block  32 . The spring  31  is set between the spring room  14  and the driving block  32 . 
     Referring to the drawings to  FIGS. 4-6 , the cover member  2  encloses the accommodating portion  11  of screwdriver device  1  and the hook portions  13  on the accommodating portion  11  are engaging with the track  22  so that the cover member  2  cannot rotate along the screwdriver device  1  relatively. Therefore, a user can grip the screwdriver device  1  and the cover member  2  to screw or to loose bolts. In addition, the driving block  32  is pushed by the spring  31  so that the driving block  32  occupies the through hole  23  completely. Consequently, the cover member  2  cannot move axially along the screwdriver device  1  and cannot escape easily from the screwdriver device  1 . 
     When the user want to take one tool bit within the tool bit set  41  from the accommodating portion  11 , the user presses two buttons  252  so that the pushing blocks  251  below the buttons  252  push the driving blocks  32  into the spring rooms  14  and compress the springs  31  simultaneously. After the end of the driving block  32  moves through the through hole  23  completely, the user can pull cover member  2  back and the rear spring  16  placed on the spring fastener  15  also pushes the cover member  2  back. Finally, the cover member  2  quickly slides out from the accommodating portion  11 . Therefore, the user can quickly take off the cover member  2  from the accommodating portion  11  and take one tool bit within the tool bit set  41  to assemble to the working shaft  17 . 
     After the user alternates one tool bit from another, a prior tool bit is placed into the accommodating room  12  on the accommodating portion  11 . The user further moves the cover member  2  forward along the hook portions  13  through the tracks  22  until the button  252  is received through the button hole  262 , wherein the driving block  32  pushed by the spring  31  pushes the pushing block  251  and the button  252  toward the button hole  262 . Consequently, the user puts the screwdriver device  1  and cover member  2  together again for doing another task. 
     Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.