Abstract:
A pneumatic tool percussion hammer features motion ends of the percussion block of the percussion hammer with added configuration of a mass increasing part. The mass increasing part can help to increase the mass of the motion ends of the percussion block without increasing the overall size of the percussion block. Hence, the present invention can effectively increase the inertia force of the percussion block in motion, and consequently the torsion and instant acceleration of the percussion hammer, without the need to increase the overall size of the percussion hammer.

Description:
CROSS-REFERENCE TO RELATED U.S. APPLICATIONS 
       [0001]    Not applicable. 
       STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
       [0002]    Not applicable. 
       NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT 
       [0003]    Not applicable. 
       REFERENCE TO AN APPENDIX SUBMITTED ON COMPACT DISC 
       [0004]    Not applicable. 
       BACKGROUND OF THE INVENTION 
       [0005]    1. Field of the Invention 
         [0006]    The present invention relates generally to a pneumatic tool percussion hammer structure, and more particularly to an innovative torsion increasing percussion hammer. 
         [0007]    2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98. 
         [0008]    The functions of various pneumatic tools are based on torsion generated by the pneumatic power. For example, a pneumatic spanner is mainly used to fasten or loosen large-sized nuts or bolts. Because such large-sized nuts or bolts require a high fastening torsion, the pneumatic spanner must generate sufficient torsion to be capable of the operation. 
         [0009]    Said pneumatic spanner usually generates torsion through the configuration of a percussion seat. Inside the percussion seat, one or two block-shaped percussion hammers are housed and restrained. The hammers will have an inertia motion along with the stops of positive or negative revolving of the driving axle, and generate a torsion-increasing percussion force. 
         [0010]    Based on existing designs, the torsion generated by the pneumatic spanner usually depends on the size of the percussion hammers, because larger and heavier percussion hammers will naturally generate higher inertia acting force. However, in this way, the overall size of the pneumatic spanner must be enlarged to meet the demand of higher torsion. This is obviously a problem and bottleneck for production as well as usage. 
         [0011]    For the users, a small-sized pneumatic spanner is easier to operate and is obviously more convenient and practical. Hence, it is obviously a goal and target for the manufacturers to further increase the functional torsion of the pneumatic spanner while maintaining its relatively small size, so as to meet the expectation of users. 
         [0012]    Thus, to overcome the aforementioned problems of the prior art, it would be an advancement if the art to provide an improved structure that can significantly improve the efficacy. 
         [0013]    Therefore, the inventor has provided the present invention of practicability after deliberate design and evaluation based on years of experience in the production, development and design of related products. 
       BRIEF SUMMARY OF THE INVENTION 
       [0014]    The present invention mainly features the innovative and unique design of the motion ends of the percussion block of the percussion hammer with added configuration of the mass increasing part. Comparing to the known structures disclosed in the prior art, the mass increasing part can help to increase the mass of the motion ends of the percussion block without increasing the overall size of the percussion block. Hence, the design of the present invention can effectively increase the inertia force of the percussion block in motion, and consequently the torsion and instant acceleration of the percussion hammer, without the need to increase the overall size of the percussion hammer. This is an obvious advantage and practical advancement. 
         [0015]    As a supplement to the above descriptions, taking the pneumatic spanner product shown in  FIGS. 2 and 3  for example, if the output torsion of a prior-art pneumatic spanner of the same specifications is 350 ft-lbs, with adoption of the design disclosed by the present invention, the output torsion will increase by about 100 ft-lbs to 450 ft-lbs. Moreover, the instant acceleration time to reach the preset torsion will decrease from 5 seconds to 3 seconds. This is a preliminary testing result by the inventor and is for reference only. 
         [0016]    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. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0017]      FIG. 1  is an exploded perspective view of a preferred embodiment of the percussion hammer structure of the present invention. 
           [0018]      FIG. 2  is an exploded perspective view of the percussion hammer of the present invention implemented in a pneumatic tool. 
           [0019]      FIG. 3  is an assembled perspective view of the percussion hammer of the present invention implemented in a pneumatic tool. 
           [0020]      FIG. 4  is a perspective view of the mass increasing part of the present invention being a projecting block integrally extending from the motion end of the percussion block. 
           [0021]      FIG. 5  is a perspective view of the mass increasing part of the present invention being independently made and locked onto the motion end of the percussion block. 
           [0022]      FIG. 6  is a perspective view of the mass increasing part of the present invention being of a heavier material and embedded in the motion end of the percussion block. 
           [0023]      FIG. 7  is a perspective view of the mass increasing part of the present invention configured on both motion ends. 
           [0024]      FIG. 8  is a schematic view of the mass increasing part of the present invention differently configured on the two motion ends. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0025]      FIG. 1  depicts a preferred embodiment of the torsion increasing pneumatic tool percussion hammer structure of the present invention. However, it is to be understood that, such an embodiment is illustrative only, and is not intending to be limiting to the scope of patent application. The pneumatic tool using said percussion hammer can be a pneumatic spanner. 
         [0026]    The percussion hammer A comprises a percussion seat  10 , being a hollow frame, comprising of a percussion block housing space  11  and a croze hole  12  and an axle through hole  13  configured on the two opposite side walls of the percussion block housing space  11 . 
         [0027]    A driving axle  20  has a driving end  21  and a tool end  22  (can be a quadrangular prism), wherein, the driving end  21  goes through the axle through hole  13  of the percussion seat  10  and is housed in the percussion block housing space  11 . The driving end  21  has a driving rib  23 . The tool end  22  projects out of the axle through hole  13  of the percussion seat  10  as the part to fasten or loosen the bolt. 
         [0028]    At least one percussion block  30  (this embodiment has two) is housed inside the percussion block housing space  11  of the percussion seat  10  and is movable. Said percussion block  30  comprises an irregular through hole  31  and two motion ends  32 . The irregular through hole  31  is to be matched and fitted by the driving end  21  of the driving axle  20 . Further, the two opposite sides of the percussion block  30  are respectively configured with a supporting concave edge  33  and a motion limiting concave edge  33 B. 
         [0029]    Two fixation pins  40  go through and are fitted on the two opposite sides of the percussion block housing space  11  of the percussion seat  10 . If viewing from the percussion block  30 , one of the fixation pins  40  goes through the supporting concave edge  33  configured on the percussion block  30 , while the other fixation pins  40  goes through the motion limiting concave edge  33 B configured on the percussion block  30 . 
         [0030]    A mass increasing part(s)  50  is configured on the motion end  32  of the percussion block  30 . Said mass increasing part  50  is to increase the mass of the motion end  32  of the percussion block  30 . 
         [0031]    Based on the above structure, the mass increasing part  50  can increase the inertia acting force of the percussion block  30  in motion, so as to increase the torsion and instant acceleration of the percussion hammer A, without the need to increase the overall size of the percussion hammer. 
         [0032]      FIGS. 2 and 3  depict an implementation of the percussion hammer A in a pneumatic tool. In this implementation, the pneumatic tool is a pneumatic spanner  60 . The percussion hammer A is fitted into a driving slot  62  preset in the main body  61  of the pneumatic spanner  60 , and then covered and limited by a shell cover  63 . The center of the shell cover  63  is configured with a through hole  64  for the tool end  22  configured on the driving axle  20  of the percussion hammer A to go through and out (as shown in  FIG. 3 ). Further, a driving stud shaft is configured inside the driving slot  62  (omitted in the drawing) to perfectly mesh with the croze hole  12  configured on the percussion seat  10 , so as to drive the percussion hammer A to rotate. 
         [0033]    Particularly, the embodiment of said mass increasing part  50  (as depicted in  FIG. 4 ) can be a projecting block integrally extending from the motion end  32  of the percussion block  30 . 
         [0034]    Alternatively, as shown in  FIG. 5 , the mass increasing part  50 B is independently made and then locked (for instance, through bolts  70 ) or combined (for instance, through welding) onto the motion end  32  of the percussion block  30 . 
         [0035]    Further, as shown in  FIG. 6 , the mass increasing part  50 C is of a heavier material comparing to the percussion block  30 , and the motion end  32  of the percussion block  30  is configured with an embedding part  34  for the mass increasing part  50 C to be inserted or embedded. 
         [0036]    Moreover, said mass increasing part  50  can be configured on either of the two motion ends  32  of the percussion block  30  (as shown in  FIG. 4 ). Or, as shown in  FIG. 7 , a mass increasing part  50  is configured on both of the two motion ends  32 . Configuration of the mass increasing part  50  on one motion end  32  only or on both of the two motion ends  32  will depend on the inertia increasing effect demanded by the industry, and is not limited. 
         [0037]    Referring to  FIG. 8 , when two percussion blocks  30 ,  30 B are configured, it will be a preferred embodiment if the mass increasing part  50  on the different percussion blocks  30 ,  30 B are configured symmetrically in a balanced state according to the rotation need. On the two different percussion blocks  30 ,  30 B depicted in this drawing, the two motion ends  32  are configured respectively with two different-sized mass increasing parts  50 ,  50 B, so that the percussion blocks  30 ,  30 B will exert different inertia force during positive and negative rotation, but the mass increasing part  50  and mass increasing part  50 B must be configured in a balanced and symmetrical manner on the two percussion blocks  30 ,  30 B (i.e., balanced diagonally) so as to keep balance and stability during operation. 
         [0038]    Moreover, when two percussion blocks  30 ,  30 B are configured, the different mass increasing parts  50 ,  50 B configured on the motion ends  32  of the percussion block  30 ,  30 B can be of different mass (as shown in  FIG. 8 ), and be fitted in the percussion block housing space  11  of the percussion seat  10  according to the need for mass increase in the positive or negative rotating direction, so as to provide different inertia force.