Abstract:
A impact testing apparatus for includes a workbench, a bracket defining a vertical passage, a hammer slidably received in the passage of the bracket, a fastening mechanism slidably mounted to the bracket and an anvil for supporting a workpiece to be tested. The workbench includes a horizontal platform. The bracket is arranged over the platform. The fastening mechanism is configured to be selectively fixed to different heights of the bracket relative to the platform, and includes a retaining member cable of being bias between a first position to holding the hammer and a second position to release the hammer. The anvil is disposed on the platform and align with the hammer.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to testing apparatuses and, more particularly, to a testing apparatus for performing an impact test of a manufactured workpiece. 
         [0003]    2. Description of Related Art 
         [0004]    Generally, most manufactured workpieces are required to have sufficient durability against destructive acts from outside, thus after the workpieces are manufactured, impact tests are usually performed thereupon via impact testing apparatuses. An ordinary impact testing apparatus includes a horizontal workbench, an anvil with an opening defined therein placed on the workbench, a pin, a hollow sleeve defining a passage and a plurality of slots at a wall of the sleeve, and a hammer slidably received in the passage of the sleeve. In use, a workpiece to be tested is placed on the anvil. The sleeve is vertically located above the workpiece with the passage coaxially aligning with the opening of the anvil. The hammer is lifted to a predetermined height via the pin being inserted through the hammer to engage in a corresponding slot of the sleeve, wherein the hammer aligns with the opening of the anvil. The pin is released to make the hammer fall toward the anvil, to impact the workpiece. Thus, durability against destructive acts of the workpiece can be obtained. However, assembling or disassembling the hammer via the pin is inconvenient, and the hammer may only be lifted at limited positions, according to the plurality of slots. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]      FIG. 1  is an assembled, isometric view of an exemplary embodiment of an impact testing apparatus. 
           [0006]      FIG. 2  is an exploded, isometric view of the impact testing apparatus of  FIG. 1 , the impact testing apparatus including a fastening mechanism. 
           [0007]      FIG. 3  is an enlarged view of the fastening mechanism of  FIG. 2 . 
           [0008]      FIG. 4  is a left-side elevational view of the impact testing apparatus of  FIG. 1 . 
           [0009]      FIG. 5  is a front elevational, partially cutaway view of the impact testing apparatus of  FIG. 1 . 
           [0010]      FIGS. 6 and 7  are enlarged views of the encircled portion VI of  FIG. 5 , but showing two different states. 
           [0011]      FIG. 8  is similar to  FIG. 1 , but showing with a workpiece to be tested. 
           [0012]      FIG. 9  is similar to  FIG. 8 , but showing with a different workpiece to be tested. 
       
    
    
     DETAILED DESCRIPTION 
       [0013]    Referring to  FIGS. 1 and 2 , an exemplary embodiment of an impact testing apparatus includes a workbench  10 , a bracket  20 , a hammer  30 , an anvil  40 , and a fastening mechanism  50 . 
         [0014]    The workbench  10  includes a horizontal platform  12 , a plurality of supporting bolts  11  screwed in four corners of the platform  12  to support the platform, an L-shaped connecting member  14  extending up from the platform  12 , and a triangle-shaped reinforcing member  16  extending up from the connecting member  14 . The connecting member  14  includes a vertical part and a horizontal part perpendicularly extending from a first end of the vertical part. A second end of the vertical part is perpendicularly mounted to the platform  12 . Thus, the horizontal part is parallel to the platform  12 . A positioning hole  125  is defined in the middle of the platform  12  under the horizontal part of the connecting member  14 . A plurality of retaining posts  13  extends up from the platform  12 , surrounding the positioning hole  125 . A plurality of screw holes (not shown) is defined in a vertical side of the reinforcing member  16 . 
         [0015]    The bracket  20  is a hollow long bar having a square cross section. A passage is defined in the bracket  20  along the longitudinal axis of the bracket  20 . The bracket  20  includes a first sidewall  21 , a second sidewall  23  opposite to the first sidewall  21 , a third sidewall  22  perpendicularly connected between corresponding ends of the first and second sidewalls  21  and  23 , and a fourth sidewall  24  opposite to the third sidewall  22 . A first slot  217  is longitudinally defined in the first sidewall  21 , through a bottom of the first sidewall  21 . A second slot  221  is longitudinally defined in the second sidewall  23 . A plurality of apertures  241  is defined in the fourth sidewall  24 , corresponding to the plurality of screw holes of the reinforcing member  16 . 
         [0016]    The hammer  30  includes a cylindrical body  31  and a handle  33 . A holding portion  311  and an attacking pole  313  respectively extend from opposite ends of the body  31 . The holding portion  311  is mushroom-shaped, and includes a small end connected to the body  31  and a taper-shaped head opposite to the small end. The body  31  defines a screw hole  315  therein. The handle  33  includes a threaded shank  331  to engage in the screw hole  315 . 
         [0017]    The anvil  40  is cylindrical and defines a receiving hole  43  along an axis direction. The anvil  40  forms a positioning post  45  at a closed end opposite to the receiving hole  43 , to be fixed in the positioning hole  125  of the platform  10 . A cushion  41  is received in the receiving hole  43  of the anvil  40 . 
         [0018]    Referring to  FIG. 3 , the fastening mechanism  50  includes a button  51 , a coil spring  52 , a knob  53 , a sliding member  54 , a retaining member  55 , and a pin  57 . The button  51  includes a securing portion  511 . The knob  53  includes a manipulating portion  531  and an abutting portion  533  extending from a side of the manipulating portion  531 . A screw hole  535  is defined in the knob  53  through the manipulating portion  531  and the abutting portion  533 . The sliding member  54  includes a T-shaped sliding block  543  and a threaded shank  541 . The sliding block  543  includes a greater blocking portion  5431  and a smaller sliding portion  5432  extending from a side of the blocking portion  5431 . The threaded shank  541  extends from the sliding portion  5432 , away from the blocking portion  5431 . A through hole  545  is defined in the sliding member  54 , through the threaded shank  541  and the sliding block  543 . The retaining member  55  includes a rectangular frame  553  and a connecting pole  551 . The frame  55  includes a first sidewall (not labeled), and two second sidewalls (not labeled) perpendicularly connected to opposite ends of the first sidewall. The connecting pole  551  perpendicularly extends from the first sidewall of the frame  553 . Two fixing holes  554  aligning with each other are defined in the two second sidewalls of the frame  553 , to hold the pin  57 . The connecting pole  551  defines a securing hole  552  in a distal end opposite to the frame  553 . 
         [0019]    Referring to  FIGS. 4 to 6 , in assembly, the pin  57  is engaged in the fixing holes  554  of the frame  553  of the retaining member  55 . The connecting pole  551  slidably passes through the through hole  545  of the sliding member  54  from the sliding block  543 . The frame  553  of the retaining member  55  and the sliding block  543  of the sliding member  54  are received in the passage of the bracket  20  from a bottom of the bracket  20 . The sliding portion  5432  of the sliding member  54  slides in the first slot  217 , and the blocking portion  5431  located at opposite sides of the sliding portion  5432  abuts against an inside surface of the first side wall  21  of the bracket  20 . The threaded shank  541  extends out of the bracket  20  through the first slot  217  and engages in the screw hole  535  of the knob  53  by rotating the knob  53 , until the abutting portion  533  abuts against an outside surface of the first wall  21  of the bracket  20 . Therefore, the sliding member  54  is stopped from sliding along the first wall  21 . The connecting pole  551  further extends out of the manipulating portion  531  through the screw hole  535  of the knob  53 , and passes through the coil spring  52 . The securing portion  511  of the button  50  is fixed in the securing hole  552  of the connecting pole  551  of the retaining member  55 , therefore, opposite ends of the coil spring  52  resist against the manipulating portion  531  of the knob  53  and the button  51 . 
         [0020]    The body  31  of the hammer  30  is vertically received in passage of the bracket  20  from the bottom of the bracket  20  and under the fastening mechanism  50 , with the attacking pole  313  extending downwards. The threaded shank  331  of the handle  33  passes through the second slot  221  of the bracket  20  and is screwed in the screw hole  315  of the body  31 . The hammer  30  is capable of being lifted up or put down, by sliding the handle  33  along the second slot  221 . When the holding portion  311  resists against the pin  57 , the retaining member  55  is pushed to drive the button  51  to move towards the knob  53 , such that the coiling spring  52  is deformed. When the taper-shaped head of the holding portion  311  moves over the pin  57 , the coiling spring  52  restores and biases the button  51  away from the knob  53 . The retaining member  55  and the pin  57  is moved with the button  51 , therefore, the pin  57  engages with a bottom of the holding portion  311  of the body  31  of the hammer  30 , to retain the hammer  30  in the bracket  20 . 
         [0021]    The anvil  40  is secured to the platform  12  of the workbench  10  by fixing the positioning post  45  in the positioning hole  125 . The cushion  41  is placed in the receiving hole  43  of the anvil  40 . 
         [0022]    The bottom of the bracket  20  is secured to a distal end of the horizontal part of the connecting member  14  via a plurality of screws, away from the vertical part of the connecting member  14 . The vertical lateral of the reinforcing member  16  abutting against the fourth sidewall  24  of the bracket  20 , a plurality of screws pass through the second slot  221  and the apertures  241  of the fourth sidewall  24 , and then engage into the corresponding screw holes of the vertical lateral of the reinforcing member  16 . Therefore, the bracket  20  is vertically fixed to the workbench  10  and an axis of the body  31  of the hammer  30  aligns with an axis of the anvil  40 . 
         [0023]    Referring to  FIGS. 7 and 8 , in use, a workpiece  60   a  having a small size may be placed on the anvil  40 , covering the receiving hole  43 . The manipulating portion  531  is rotated to release the sliding member  54  from the first side wall  21  of the bracket  20 . The fastening mechanism  50  is adjusted to a predetermined height, with the sliding portion  5432  sliding in the first slot  217 . The manipulating portion  531  is reversely rotated to fix the fastening mechanism  50  together with the hammer  30  at the predetermined height. The button  51  is driven to move towards the knob  53  to deform the coiling spring  52 . The retaining member  55  is moved with the button  51 , resulting in the holding portion  311  of the hammer  30  disengaging from the pin  57 . Therefore, the hammer  30  falls from the predetermined height, and the attacking pole  313  of the hammer  30  impacts the workpiece  60   a.  In case the workpiece  60   a  is broken by the falling hammer  30 . The cushion  41  received in the receiving hole  43  of the anvil  40  can protect the attaching pole  313  from being damaged by directly knocking at the closed end of the anvil  40 . 
         [0024]    Referring to  FIG. 9 , when a workpiece  60   b  having a greater size needs to be tested, the workpiece  60   b  is placed on the anvil  40 , and supported by the retaining posts  13 . The retaining posts  13  can be adjusted to assure the top of the retaining posts  13  and the anvil  40  are coplanar, therefore, the workpiece  60   b  abuts against the anvil  40  in balance to increase the accuracy of the testing result. 
         [0025]    It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.