Abstract:
The present invention provides a blender lid safety protection device comprising a latch cover mechanism installed outside a mixing cup, such that after a lid is covered vertically onto the mixing cup, the lid is latched and fixed to the latch cover mechanism; and a link rod, having a spring coupled to the bottom of the link rod for propping the bottom of the link rod to a certain distance from one of the control switches of a power circuit control switch. After the blender lid is press down, the top end of the link rod drives a compression spring at the bottom of the link rod to move downward to trigger a control switch. Only after the blender lid is covered onto the mixing cup, the control switch of one of the power circuit switches will be electrically conducted, so as to provide a safety protection.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a blender lid safety protection device, and more particularly to a blender lid safety protection device capable of electrically conducting a control switch of one of the power circuits of a blender, only if a blender lid is vertically covered onto a mixing cup to a correct position, so as to achieve the safety protection effect and facilitating users to cover the blender lid. 
         [0003]    2. Description of the Related Art 
         [0004]    As a conventional blender generally includes a base with a motor, a mixing cup disposed on the base, and a blender lid covered onto the mixing cup, wherein a knife is installed at the bottom of an internal side of the mixing cup of the blender and driven and rotated by a motor, such that after a user puts a food material into the mixing cup and then presses a switch installed on the base, the knife installed in the mixing cup can cut and/or crush the food material. To prevent a possible risk of cutting the user&#39;s fingers when the user opens the blender lid and puts his/her hand into the operating blender, conventional advanced blenders usually come with a safety protection device that will disconnect a power circuit immediately if the blender lid is not secured to a fixed position or the blender lid is opened. In the aforementioned safety protection method, the conventional blender lid and the mixing cup are generally secured by rotating the lid and securing the mixing cup. Obviously, the operation of securing the blender lid by rotating the lid is quite inconvenient. In view of such drawback, the inventor of the present invention provides a blender lid safety protection device in accordance with the present invention to overcome the drawback of the prior art. 
       SUMMARY OF THE INVENTION 
       [0005]    Therefore, it is a primary objective of the present invention to provide a blender lid safety protection device capable of electrically conducting a control switch of one of the power circuits, only if the blender lid is vertically covered onto a mixing cup and secured and fixed onto the mixing cup properly, so as to prevent a knife installed in the mixing cup from cutting a user&#39;s hand, when the user extends his/her hand into the mixing cup of a blender accidentally. 
         [0006]    To achieve the foregoing objective, the present invention provides a blender lid safety protection device comprising: a latch cover mechanism installed outside a mixing cup, such that after the blender lid is vertically covered onto the mixing cup, the blender lid is latched and fixed by the latch cover mechanism; a link rod having a spring passed and installed to the bottom end of the link rod for supporting and keeping the link rod with a certain distance from the control switch of one of the power circuits, such that after the blender lid is covered onto the mixing cup, the top end of the link rod is pressed downwardly by the blender lid, and the compression spring at the bottom of the link rod is moved downward to trigger the control switch. Therefore, the control switch of one of the power circuits is electrically conducted only if the blender lid is covered onto the mixing cup properly, so as to provide a safety protection effect. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]      FIG. 1  is a perspective view of a mixing cup and a blender lid in accordance with a preferred embodiment of the present invention; 
           [0008]      FIG. 2  is a cross-sectional view of a blender lid covered onto a mixing cup in accordance with a preferred embodiment of the present invention; 
           [0009]      FIG. 3  is an exploded view of a mixing cup and a blender lid in accordance with a preferred embodiment of the present invention; 
           [0010]      FIG. 4  is a cross-sectional view of Section  4 - 4  of  FIG. 2 ; 
           [0011]      FIG. 5  is a cross-sectional exploded view of a blender lid and a mixing cup in accordance with a preferred embodiment of the present invention; 
           [0012]      FIGS. 6 and 7  are schematic views of combining a blender lid and a mixing cup in accordance with a preferred embodiment of the present invention; and 
           [0013]      FIGS. 8 to 10  are schematic views of detaching a blender lid from a mixing cup in accordance with a preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0014]    To make it easier for our examiner to understand the technical characteristics and measures of the present invention to achieve the aforementioned objects and effects, we use preferred embodiments with related drawings for the detailed description of the present invention as follows. 
         [0015]    With reference to  FIGS. 1 to 3  for a blender lid safety protection device in accordance with the present invention, the blender safety protection device comprises the following three major parts including a base of an electric blender, a mixing cup and a blender lid. 
         [0016]    The mixing cup  10  (as shown in  FIG. 3 ) comprises: a handle  11  coupled to an external side of the mixing cup  10 ; a hollow female embedding base  110  formed in a space at the top of the handle  11  and having a notch  1100  formed separately at front and rear ends of female embedding base  110 ; a link rod  12  (as shown in  FIG. 2 ) extended downwardly along the external wall of the mixing cup  10  and having the top end passed through the handle  11  and extended into the female embedding base  110  and the bottom end passed into the external edge of the bottom of the mixing cup  10  and extended into the bottom of the mixing cup  10 , a protective cover  13  (as shown in  FIGS. 2 and 3 ) installed onto the exterior of the mixing cup  10  to cover the link rod  12  between the protective cover  13  and the mixing cup  10  to restrict the link rod  12  to be displaced linearly up and down only, and a control switch  115  (as shown in  FIGS. 2 and 6 ) of one of the power circuits installed at the bottom of the mixing cup  10  and with a predetermined distance from the bottom end of the link rod  12 . The female embedding base  110  has a through hole  113  formed at the top surface corresponding to the top end of the link rod  12  and a transverse slot  114  (as shown in  FIG. 4 ) penetrated through the middle of two sidewalls; a link rod  12  having a spring  121  passed and installed to the bottom of the link rod  12 , and the spring  121  having an elastic force to push and maintain the link rod  12  upward, such that the bottom end of the link rod  12  is maintained at a position with a certain distance from the control switch  115  below. 
         [0017]    The blender lid  20  (as shown in  FIGS. 2 and 3 ) is installed at the top of the mixing cup  10 , and the blender lid  20  includes a male embedding base  200  protruded from the blender lid  20  and corresponsive to a side of the female embedding base  110 , and the male embedding base  200  can be embedded into an external side of the female embedding base  110 . The male embedding base  200  includes a pushing plate  201  extended downwardly from an internal ceiling corresponding to the top end of the link rod  12  and at a position of the through hole  113  on the top surface of the female embedding base  110 , and the male embedding base  200  corresponsive to the notch  1110  and formed at an end of an external side of the female embedding base  110  has an opening  203  corresponding to the external sidewall, and an inwardly concave guide rail  202  (as shown in  FIG. 5 ) installed separately on both corresponding internal walls of the male embedding base  200  that is perpendicular to the opening  203 , and the guide rail  202  has a horizontal section  202   a  and a vertical section  202   b  coupled to the horizontal section  202   a,  wherein the vertical section  202   b  is disposed closer to the mixing cup  10 , and the vertical section  202   b  is disposed closer to the internal wall of an end of the push handle  310  to define a tapered internal wall  202   c  with an expanded opening at the bottom. 
         [0018]    In  FIGS. 3 and 5 , a latch cover mechanism  30  is embedded into the female embedding base  110  at the top end of the handle  11  and provided for latching and fixing the blender lid  20  after the blender lid  20  is covered onto the mixing cup  10 . The latch cover mechanism  30  comprises a latch base  31  that can be driven and displaced transversally, and a spring  32  for pushing the latch base  31  to move outward, wherein the latch base  31  has a push handle  310  installed at the end of the notch  1110  on an external side of the female embedding base  110  and two parallel side wings  311  extended towards the mixing cup  10 , and after a latch pellet  312  protruded separately from both side wings  311  and disposed opposite to the horizontal section  202   a  of the guide rail  202  of the blender lid  20  and the transverse slot  114  of the female embedding base  110  is passed through the transverse slot  114  of the female embedding base  110 , a distal portion of the latch pellet  312  is embedded into the horizontal section  202   a  of the guide rail  202  of the blender lid  20 , such that the latch base  31  can be disposed in the female embedding base  110  (as shown in  FIG. 4 ). The spring  32  has an elastic force of pushing the latch base  31 , such that the push handle  310  can be pushed and passed through the notch  1110  of the female embedding base  110  and the opening  203  of the male embedding base  200 , and extended out from the male embedding base  200 . The latch cover mechanism further comprises a fixing base  33  fixed into the female embedding base  110  of the handle  11 , a longitudinal through slot formed at an end of the latch cover mechanism for passing the top end of the link rod  12  to restrict the link rod  12  to be displaced linearly and longitudinally only, and the other end is pushed by the spring  32 , such that the other end of the spring  32  can push the latch base  31  to displace towards the notch  1110  of the female embedding base  110 . 
         [0019]    If it is necessary to cover the blender lid  20  onto the mixing cup  10  as shown in  FIGS. 5 to 7 , after the blender lid  20  is covered onto the mixing cup  10 , the male embedding base  200  of the blender lid  20  is coupled internally and externally to the female embedding base  110  of the mixing cup  10 . Now, the pushing plate  201  installed in the male embedding base  200  of the blender lid  20  is passed into the through hole  113  of the female embedding base  110  of the handle  11 , and the link rod  12  is pressed down correspondingly, so that the spring  121  compressed at the bottom of the link rod  12  triggers a control switch  115  of one of the power circuits to electrically conduct the control switch  115  (as shown in  FIG. 8 ). In the meantime, a bottom opening at the vertical section  202   b  of the guide rail  202  of the male embedding base  200  of the blender lid  20  is provided for embedding the latch pellet  312  of the latch cover mechanism  30 . During the process of pressing the blender lid  20  down and covering the blender lid  20  onto the mixing cup  10 , the latch pellet  312  of the latch base  31  will be guided and shifted along the tapered internal wall  202   c  of the vertical section  202   b  of the guide rail  202  (as shown in  FIG. 6 ), such that the latch base  31  will compress the spring  32 , until the latch pellet  312  is moved to the horizontal section  202   a.  Now, the blender lid  20  is covered completely onto the mixing cup  10 , and the latch base  31  will resume its original position by the resilience of the spring  32  as shown in  FIG. 7 , and the latch pellet  312  of the latch base  31  is disposed at the horizontal section  202   a  of the guide rail  202  of the blender lid  20  and at a position which is not corresponsive to the vertical section  202   b,  so as to latch the blender lid  20  and prevent the blender lid  20  from being lifted open freely. After the blender lid  20  is covered onto the mixing cup  10 , the blender lid  20  is latched and positioned by the latch cover mechanism  30 , and the link rod  12  will trigger a control switch  115  of one of the power circuits to electrically conduct the control switch  115 . If it is necessary to lift open the blender lid  20  (as shown in  FIGS. 8 to 10 ), the push handle  310  of the latch cover mechanism  30  is pushed inward, such that a side of the latch base  31  compresses the spring  32 . When the latch pellet  312  is moved to an intersection of the horizontal section  202   a  and the vertical section  202   b  of the guide rail  202 , the link rod  12  pressed downward by the spring  121  resumes its original position and pushes the link rod  12  and the blender lid  20  upward to align the vertical section  202   b  of the guide rail  202  of the blender lid  20  with the latch pellet  312  evenly. Now, the blender lid  20  can be removed. In the meantime, the link rod  12  moves upward but does not trigger the control switch  115  anymore, and thus the power circuit can be disconnected (as shown in  FIG. 10 ). As a result, the power circuit will be disconnected immediately to achieve the safety protection effect once if the blender lid  20  is detached from a correct covering position of the mixing cup  10 . 
         [0020]    In summation of the description above, the present invention as disclosed in the preferred embodiments are novel and it achieves the expected objectives and effects and complies with the patent application requirements, and thus is duly applied for patent application.