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 fig1 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 fig3 , 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 fig4 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 fig6 , 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 fig5 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 .
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 .