Abstract:
A grinding type juice extractor includes upper and lower grinding rings for providing both grinding and rolling effects during a process of extracting juice, and food materials are inputted for extracting juices, and the upper and lower grinding rings correspond to each other to define a clamping status, such that the inputted food material can be grinded, and a mechanism or method of applying two kinds of physical forces to the food material can be used for extracting the juice of the food material and maximizing the juice yield. In addition, a filter surface of a filter ring is provided for filtering the juice, and a juice outlet tube installed to a middle seat is provided for outputting the juice. Such juice extractor can improve the juice yield and reduce waste of resources.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a juice extractor, and more particularly to a juice extractor having the grinding and squeezing functions concurrently. 
     2. Description of the Related Art 
     To extract juice inside a food material by an effort-saving operation, a juice extractor or a juice machine (not limited for the use of extracting fruit juices only) is generally used, wherein most juice extractors have a press mechanism for pressing the food material (including but not limited to a fruit) and squeezing juice out from the food material, and most juice machines have a rotary knife for cutting and blending the food material into a paste form, such as squeezing the juice out from the fruit or blending the fruit into a fruit paste. Some dieters may add water and condiments to produce a fruit juice, and others may blend corps such as soybeans, yellow beans or vegetables with water and condiments by a high-speed rotating knife to produce drinks such as soya milk and vegetable juices. Regardless of the juice extractor or the juice machine, the main concern is to fully extract the juice from the food material without waste. 
     A household juice machine disclosed in P.R.C. Pat. Application No. 200520120453.4 comprises a machine base, a motor, a blending cup, a juice cup, a residue cup and a feeder, wherein the motor is installed onto the machine base, and the blending cup includes a planar gear knife disk installed therein, and the planar gear knife disk is coupled to a motor axle by its thread, and the feeder is covered onto the top of the blending cup, and teeth of the gear knife of the planar gear knife disk are arranged radially with an inclined angle in a clockwise direction. The juice machine having a knife disk structure provides high-speed cutting and squeezing, without requiring a pushing rod to complete the process of squeezing juice. However, the aforementioned structure of the knife disk has the following drawbacks. During a high-speed rotation of the knife disk, juices in large chunks of fruit flesh or vegetable are not squeezed out completely at a preliminary cutting stage, and the large chunks are spun out from the knife disk into the residue container at the periphery of the knife disk due to centrifugal force, and thus giving rise to a low juice yield and a waste of raw material. 
     SUMMARY OF THE INVENTION 
     In view of the shortcomings of the prior art, the inventor of the present invention based on years of experience in the related industry to conduct extensive researches and experiments, and finally developed a grinding type juice extractor in accordance with the present invention. 
     Therefore, it is a primary objective of the present invention to overcome the aforementioned shortcomings and deficiencies of the prior art by providing a grinding type juice extractor to improve the juice yield and save the raw materials. 
     To achieve the foregoing objective, the present invention provides a grinding type juice extractor comprising: a middle seat, with both ends in an open form, and a hollow area interconnected with a juice outlet tube and the hollow area; a filter member, being in a circular shape, contained inside the middle seat, and having a circular filter surface, and the circular filter member having a lower grinding ring with a rough surface disposed around an internal periphery of the circular filter member; a cover, installed to the top of the middle seat, and having an upper grinding ring installed to the bottom of the cover, and the upper grinding ring corresponding to the lower grinding ring to define a clamping status of an internal periphery of the filter member, and the cover having an opening passage with both penetrating ends and penetrated from the top of the cover into the circular hole of the upper grinding ring, and a push rod, movably inserted into the opening passage; and a main machine; having a link shaft passed through an opening formed at the bottom of the middle seat and coupled with the filter member in the hollow area. 
     In the present invention, the cover comprises: an opening passage with both penetrating ends and penetrated from the top of the cover to the circular hole of the upper grinding ring, such that food materials such as vegetables, fruits, yellow bean, and soybean can be inputted, and a push rod, movably inserted into the opening passage, for pressing the food material. With the upper grinding ring and the lower grinding ring installed corresponding to each other, a clamping status defined at the internal periphery of the filter ring can be used for defining a grinding status of the inputted food material to provide a way of squeezing and grinding the food material by a mechanism or method of applying two kinds of physical forces to maximize the juice yield of the food material and reduce a waste of resources. In addition, the filter surface of the filter ring is provided for extracting juice, and the juice is outputted from a juice outlet tube of the middle seat. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded view of a grinding type juice extractor in accordance with a first preferred embodiment of the present invention; 
         FIG. 2  is a cross-sectional view of an assembled grinding type juice extractor in accordance with a first preferred embodiment of the present invention; 
         FIG. 3  is a schematic view of feeding a fruit into a grinding type juice extractor in accordance with a first preferred embodiment of the present invention; 
         FIG. 4  is an exploded view of a grinding type juice extractor in accordance with a second preferred embodiment of the present invention; 
         FIG. 5  is a cross-sectional view of an assembled grinding type juice extractor in accordance with a second preferred embodiment of the present invention; and 
         FIG. 6  is a schematic view of feeding a fruit into a grinding type juice extractor in accordance with a second preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The technical characteristics of the present invention will become apparent with the detailed description of the preferred embodiments and the illustration of the related drawings. 
     With reference to  FIGS. 1 and 2  for an exploded view and a cross-sectional view of a grinding type juice extractor in accordance with a first preferred embodiment of the present invention respectively, the grinding type juice extractor comprises: 
     a middle seat  1 , with both ends in an open form, and having a hollow area  11  interconnected with a juice outlet tube  10  and the hollow area  11 ; 
     a filter member  9 , being in a circular shape, contained inside the middle seat  1 , and having a circular filter surface  90 ; 
     a lower grinding ring  73 , coupled to an internal circular periphery of the filter member  9 , and having a rough surface, such that a connecting element can be movably coupled to the filter member  9 , and the movable connecting elements facilities a replacement or removal of the lower grinding ring  73 , and a disk body  731  being formed on an internal side of the lower grinding ring  73 , and a plurality of alternate knife teeth  731 A formed at a top side of the disk body  731 ; 
     a cover  3 , installed to the top of middle seat  1 , and having an upper grinding ring  76  movably installed to the bottom of the cover  3  by a connecting element, wherein the movable connecting element facilitates a replacement or a removal of the upper grinding ring  76 , and the upper grinding ring  76  and the lower grinding ring  73  corresponding to each other to define a clamping status of an internal periphery of the filter member  9 , and the cover  3  having an opening passage  31  with both penetrating ends and penetrated from the top of the upper grinding ring  76  of the cover  3  into the circular hole  761 , and a push rod  4 , movably inserted into the opening passage  31 ; and 
     a main machine  5 , having a link shaft  50  passed through an opening formed at the bottom of the middle seat  1  and coupled with the filter member  9  in the hollow area  11 . 
     With reference to  FIG. 3 , a food material  8 , which is a fruit in this embodiment, can be inputted from the opening passage  31  of the cover  3  after the push rod  4  is movably removed, and the food material  8  will fall into the bottom position of the opening passage  31 , and then the push rod  4  is movably inserted into the opening passage  31  to press and squeeze the food material  8  in order to extract juice out from the food material  8 . In this preferred embodiment, a disk body  731  is formed on an internal side of the lower grinding ring  73 , and the disk body  731  includes a plurality of alternate knife teeth  731 A formed at a top side of the disk body  731 , the squeezing effect as well as the knife teeth  731  destructs the structure of the food material  8  to extract juice more effectively. 
     To extract juice, the present invention provides the upper grinding ring  76  and the lower grinding ring  73  corresponding to each other to define a clamping status at an internal periphery of the filter member  9  for grinding the inputted food material  8 . The mechanism or method of applying two kinds of physical forces for squeezing and grinding the food material to maximize the juice yield of the food material, and then a filter surface of the filter surface is provided for filtering the juice, and a juice outlet tube of the middle seat is provided for outputting the juice. Since the link shaft  50  of the main machine  5  is connected to the filter member  9 , the filter member  9  can be rotated to drive the lower grinding ring  73  connected to an internal circular periphery of the filter member  9 , so as to improve the juice yield and reduce a waste of resources. 
     With reference to  FIGS. 4 and 5  for a preferred embodiment of the present invention, the grinding type juice extractor further comprises: 
     a middle seat  1 , with both ends in an open form, and having a hollow area  11  interconnected with a juice outlet tube  10  and the hollow area  11 ; 
     a filter member  9 , being in a circular shape, contained inside the middle seat  1 , and having a lower grinding ring  73  with a rough surface and coupled to an internal circular periphery of the filter member  9 , and linked integrally with the filter member  9 , wherein the lower grinding ring  73  is installed at a middle section on an internal side of the filter member  9  for dividing the filter member  9  into upper and lower filter rings  91 ,  92 , and a step rim  93  is formed between the upper and lower filter rings  91 ,  92  of the filter member  9 , and the lower grinding ring  73  is installed on a surface of the step rim  93 , and a disk body  731  is formed on a bottom side of the filter member  9 , and the disk body  731  includes a plurality of alternate knife teeth  731 A; 
     a cover  3 , installed to the top of middle seat  1 , and having an upper grinding ring  76  movably installed to the bottom of the cover  3  by a connecting element, and the upper grinding ring  76  and the lower grinding ring  73  corresponding to each other to define a clamping status of an internal periphery of the filter member  9 , and the cover  3  having an opening passage  31  with both penetrating ends and penetrated from the top of the upper grinding ring  76  of the cover  3  into the circular hole  761 , and a push rod  4 , movably inserted into the opening passage  31 , wherein the push rod  4  includes a plurality of protruding dots  41  formed at a bottom side of push rod  4 , and the cover  3  includes a guide groove  32  formed at a bottom side of the cover  3  and having its bottom interconnected with the outside, and the guide groove  32  and the upper filter ring  91  are interconnected internally; and 
     a main machine  5 , having a link shaft  50  passed through an opening formed at the bottom of the middle seat  1  and coupled with the filter member  9  in the hollow area  11 . 
     With reference to  FIG. 6 , the food material  8 , which is a fruit in this embodiment, can be inputted from the opening passage  31  of cover  3  after the push rod  4  is movably removed. With reference to  FIG. 5  as well, the food material  8  will fall into a bottom position of the opening passage  31 , and then the push rod  4  is movably inserted into the opening passage  31  to press the food material  8  and extract juice of the food material  8 , so that the juice inside the food material  8  can be extracted. In this preferred embodiment, a disk body  731  is formed on an internal side of the lower grinding ring  73 , and a plurality of alternate knife teeth  731 A formed on a top surface of the disk body  731 , the squeezing effect and the knife teeth  731 A will destruct the food material  8 , and the plurality of protruding dots  41  formed at the bottom side of the push rod  4  will improve the juice yield and reduce a waste of resources. 
     To extract the juice more effectively, the present invention provides the upper grinding ring  76  and the lower grinding ring  73  corresponding to each other to define a clamping status at an internal periphery of the filter member  9  for grinding the inputted food material  8 , and applies two kinds of physical forces to the food material  8  to maximize the juice yield of the food material  8 . In addition, the filter surface of the filter ring is provided for extracting juice, and the juice outlet tube  10  of the middle seat  1  is provided for outputting juice, and the link shaft  50  of the main machine  5  is connected to the filter member  9 , such that the filter member  9  can be rotated to drive the lower grinding ring  73  connected to the internal circular periphery of the filter member  9 , so as to improve the juice yield. 
     In this preferred embodiment of the present invention, the guide groove  32  formed at the bottom side of the cover  3  is interconnected to the outside, and the guide groove  32  corresponds to a containing cup  2  having an opening facing upward, and the guide groove  32  and the upper filter ring  91  are interconnected internally, so that the containing cup  2  can receive spilled juice and/or incompletely squeezed food material  8 , and the incompletely squeezed food material can be inputted to the juice extractor for a further extraction, so as to improve the juice yield. 
     The present invention improves over the prior art and complies with patent application requirements, and thus is duly filed for the patent application. While the invention has been described by device of specific embodiments, numerous modifications and variations could be made thereto by those generally skilled in the art without departing from the scope and spirit of the invention set forth in the claims.