Abstract:
A multi-functional hand tool includes a base, an upper cover, a cam, a turning disk, a plurality of tool heads, and an indication unit. The base and the upper cover have a plurality of tracks, respectively. The turning disk is pivotally connected at a lower side of the base. In the tracks at the base and the upper cover are tool heads having distinct styles, and the tool heads are accommodated by springs. A cam is additionally provided between the base and the upper cover. By rotating the turning disk, the cam is driven to push the tool heads and compress the springs, thereby stretching the distinct tool heads out of the tracks for further usage.

Description:
BACKGROUND OF THE INVENTION 
   (a) Field of the Invention 
   The invention relates to a multi-functional hand tool, and more particularly, to a hand tool comprising a plurality of tool heads having distinct shapes in tracks at a base and an upper cover thereof, so as to provide users with facilitated selection and easy portability as well as economized storage space, thereby accomplishing effects as shortening labor hour and increasing work efficiency. 
   (b) Description of the Prior Art 
   General hand tools come in numerous types. For example, there are various specifications and dimensions merely for the commonly used screwdrivers. When dismantling or assembling screws having different sizes, it is then necessary to use screwdrivers having different specifications. Therefore, much time is spent on simply finding appropriate tools, not to mention inconveniences in carrying and spaces for storing these tools. Later the industrialists have proposed a “Pen Screwdriver” disclosed by the Taiwan Patent Publication No. 408657. This prior invention has an accommodating tube at an interior of a main body thereof, and the accommodating tube is for placing tool heads having distinct sizes and shapes. The tool heads having distinct sizes and shapes may be stretched out of the accommodating tube for dismantling and assembling of screws. Referring to the Taiwan Patent Publication No. 433127 disclosing a “Screwdriver Having Rapidly and Readily Replaceable Tool Heads”, this prior invention similarly has an accommodating chamber at a screwdriver shaft thereof, and the accommodating chamber is similarly for placing tool heads having distinct sizes and shapes, so as to dismantle and assemble screws having different sizes. However, when using the above hand tools, it is essential that tool heads be replaced by dismantling from a front end and placing in from a rear end of the accommodating tube or accommodating chamber. Suppose a required tool head is near a rear end of the prior structure, quite a number of replacements are needed before acquiring the required tool head. The prior inventions are quite time consuming and are limited to dismantling and assembly of screwdrivers only. However, in common work, not only dismantling and assembly, but also other tasks are involved. For instance, to dismantle and assemble screw nuts and screws bolts, hand tools like socket wrenches are needed. Or, tools like blades are required for tasks of cutting objects. Hence, there are yet many other fundamental and complicated tools, and the aforesaid prior hand tools become hardly satisfactory for all purposes needed. Above, all, ranges of applicability are already confined, thus giving inadequate practicability. 
   SUMMARY OF THE INVENTION 
   The primary object of the invention is to provide a multi-functional hand tool capable of offering facilitated selection, easy portability and economized storage space, so as to reduce time need for finding appropriate tools and expanding applicability ranges, thereby accomplishing effects as shortening labor hour and increasing work efficiency. 
   The invention comprises a base, an upper cover, a cam, a turning disk, a plurality of tool heads, and an indication unit. The base is a polygon, and has a recess at an inner side thereof, a track corresponding to each edge at a periphery of the recess, and a semi-hexagonal exit connected with each track and vertically penetrated through each edge of the base. The upper cover is disposed above the base, is a polygon, and has a recess at an inner side thereof, a track corresponding to each edge at an periphery of the recess, a semi-hexagonal exit connected with each track and vertically penetrated through each edge of upper cover, and an accommodating recess at an upper side thereof. The cam is pivotally connected in the recesses of the base and the upper cover, and has an axis opening, and a projecting propelling portion at a side edge thereof. The turning disk is pivotally connected at a lower side of the base, and has an axis opening, a pivotal axis inserted in the axis opening, and driving portions at the pivotal axis. The plurality of tool heads is disposed in the tracks of the base and the upper cover, and each tool head has a spring accommodated around, a push end at one end thereof, a work end having a distinct shape at the other end thereof. The indication unit is embedded into the recess of the upper cover. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows an exploded elevational view according to the invention. 
       FIG. 2  shows an elevational view according to the invention. 
       FIG. 3  shows a sectional view according to the invention. 
       FIG. 4  shows a schematic view illustrating a single-threaded work end being applied according to the invention. 
       FIG. 5  shows a sectional view illustrating a single-threaded work end being applied according to the invention. 
       FIG. 6  shows a schematic view illustrating a socket work end being applied according to the invention. 
       FIG. 7  shows a schematic view illustrating a blade work end being applied according to the invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   To better understand the invention, a preferred embodiment shall be given with the accompanying drawings hereunder. 
   Referring to  FIGS. 1 and 2 , the invention comprises a base  1 , an upper cover  2 , a cam  3 , a turning disk  4 , a plurality of tool heads  5 , and an indication unit  6 . 
   The base  1  is a polygon, and has a recess  11  at an inner side thereof, a countersink axis opening  12  at a center of the recess  11 , a track  13  corresponding to each edge at an periphery of the recess  11 , a semi-hexagonal exit  14  connected with each track  13  and vertically penetrated through each edge of the base  1 , and a plurality of screw openings  15  penetrated near the periphery of the base  1 . 
   The upper cover  2  is disposed above the base  1 , and has a shape identical to that of the base  1 . The upper cover  2  has a recess  21  at an inner side thereof, a countersink axis opening  21  at a center of the recess  21 , a track  23  corresponding to each edge at an periphery of the recess  21 , a semi-hexagonal exit  24  connected with each track  23  and vertically penetrated through each edge of upper cover  2 , wherein hexagonal exits are formed by joining the base  1  and the upper cover  2 . The upper cover  2  further has a plurality of screw openings  25  penetrated near the periphery of the upper cover  2 , screws  26  inserted into the screw openings  25 , and an accommodating recess  27  at an upper side thereof. 
   The cam  3  is pivotally connected in the recesses  11  and  21  of the base  1  and the upper cover  2 , and has a square axis opening  31 , and a projecting propelling portion  32  at a side edge thereof. 
   The turning disk  4  is pivotally connected at a lower side of the base  1 , and has a square axis opening  41 , a pivotal axis  42  inserted in the axis opening  41 , two square driving portions  43  and  44  at the pivotal axis  42 , a screw opening  45  at an end facet of the pivotal axis  42 , and a screw  46  placed in the screw opening  45 . 
   The plurality of tool heads  5  is disposed, in the tracks  13  and  23  of the base  1  and the upper cover  2 . Each tool head  5  has a spring  51  accommodated around, a push end  52  at a rear end thereof, and a work end having a distinct shape at a front end thereof. The work ends include a single-threaded work end  53 , a cross work end  54 , and a hexagonal work end  55  for dismantling and assembling screws having different shapes. The plurality of tool heads  5  further includes a work end  56  having a socket and a work end  57  having a blade. 
   The indication unit  6  is embedded into the recess  27  of the upper over  2 , and may a clock, a stopwatch, a compass or a text and graphic indication. In this embodiment, the indication unit  6  is a clock. 
   Referring to  FIG. 3 , to assemble the structure according to the invention, the cam  3  is placed in the recess  11  of the base  1 , and the tool heads  5  are disposed in the tracks  13  at the base  1  in sequence, such that the work ends of the tool heads  5  are located at the exits  14 , and the springs  51  at the tool heads  5  are butted against adjacent inner walls of the tracks  13  and the exits  14 . Wherein, one of the tracks  13  is not provided with any tool head  5 . The upper cover  2  and the base  1  are aligned and joined, so that the cam  3  is similarly located in the recess  21  of the upper cover  2 , and the propelling portion  32  at the cam  3  is butted into the tracks  13  and  23  without the tool head  5 . The turning disk  4  is positioned at an outer side of the base  2 , and is penetrated through the axis openings  41 ,  12 ,  31  and  22  of the turning disk  4 , the upper cover  1 , the cam  3  and the base  2  using the pivotal axis  42 . The screw  46  is fastened into the screw opening  45 , so as to pivotally connect the cam  3  into the recesses  21  and  11  of the upper cover  2  and the base  1 . When rotating the turning disk  4 , the driving portion  44  at the pivotal axis  42  is driven via the axis opening  41  to further rotate the pivotal axis  42 . The cam  3  is of the pivotal axis  42  is driven via the other driving portion  43 . The plurality of screws  26  is fastened into the screws openings  25  and  15  of the upper cover  2  and the base  1 , so as to join and fasten the upper cover  2  with the base  1 . The indication unit  6  is embedded into the accommodating recess  27  of the upper cover  2 . 
   Referring to  FIGS. 4 and 5 , to put the invention to use for dismantling or assembling a single-threaded screw A, the turning disk  4  is rotated for simultaneously driving the cam  3 . When the turning cam  3  reaches one of the tracks  13  and  23 , the propelling portion  32  is butted against the push end  52  of the corresponding tool head  5 . The push end  52  compresses the spring  51  of the tool head  5 , so as to have the work end thereof stretch out from the exits  14  and  24 . The turning disk  4  is rotated to a position with the single-threaded work end  53  required being stretched out, the single-threaded work end  53  is vertically placed into an aperture of the single-threaded screw A, and the base  1  and the upper cover  2  are manually rotated. For that the single-threaded work end  53  is a hexagon, and so are the exits  14  and  24  of the base  1  and the upper cover  2 , the single-threaded work end  53  is driven and rotated for further loosening and dismantling the screw A. Referring to  FIG. 6 , to dismantle a screw nut B, only the turning disk  4  is rotated in order to change to another tool head  5  having a different work end. When the tool head  5  having a socket work end  56  is stretched out from the exits  14  and  24 , the socket work end  56  is utilized for dismantling the screw nut B. Referring to  FIG. 7 , to use a blade for cutting purposes, the turning disk  4  is similarly rotated in order to change to another tool head  5  having a different work end. When the tool head  5  having a blade work end  57  is stretched out from the exits  14  and  24 , the work end  57  having a blade is utilized for cutting purposes. In addition, the indication unit  6  provides time indication function, and thus a user is kept aware over time. 
   The invention has the following excellences:
         1. The tracks at the base and the upper cover are disposed with a plurality of tool heads having distinct shapes for facilitating selection and usage, hence offering easy portability and economizing storage space.   2. Apart from work ends for dismantling and assembling different screws, the tool heads according to the invention also include a socket work end, a blade work end, and a clock, so as to provide other functions such as dismantling screw nuts, cutting objects and indicating time.   3. The invention is capable of rapidly rotating and selecting an appropriate tool head in order to reduce time needed for finding tools. Furthermore, applicable ranges are expanded for accomplishing shortening labor hour and hence increasing work efficiency.       

   It is of course to be understood that the embodiment described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.