Patent Publication Number: US-2022225834-A1

Title: Blender

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to a blender. More particularly, the present disclosure relates to a blender which has the function of detecting whether a container lid is closed by transmitting an electrical signal via a transparent film. 
     BACKGROUND 
     Generally, a blender is referred to as a mixer or crusher, and is mainly used for crushing or chopping food contained in a container body by rotating blades rotated by the motor. 
     In a normal blender, a main body having a motor operated by electricity is located at the lower side of the blender, and the container body receiving food is seated on the upper side of such a main body. Blades crushing or chopping the food are provided inside the container body, and are rotated by the rotational force of the motor. 
     Accordingly, when a user drives the motor by using a manipulation button or a knob of the main body after putting the food in the container body, the blades receiving the rotational force generated by the motor crush or chop the food contained inside the container body. 
     Such a blender has recently been developed in accordance with a user&#39;s desire to facilitate the intake of food, such as, office workers in their busy daily life. That is, a small hand blender has been developed, and a blender has been developed that allows the food to be crushed in a larger capacity or at high speed. 
     In addition, to process food ingredients contained in a container body of a blender in a fresher state, a vacuum blender, which cuts or crushes the food by vacuuming the inside of the container body has been disclosed. 
     However, what is increasingly emphasized in these various types of blenders is a safe use along with the taste and nutrition of the food processed by the blenders. That is, when a blade rotates in a state in which the container lid is opened, the food received in the container body is spilled to the outside and splattered, and when a child puts their hand inside the container body, an accident may occur. 
     Accordingly, a technology for detecting whether the container lid is mounted has been developed and disclosed. 
     For example, in U.S. Pat. Nos. 6,910,800 and 7,871,196, a push rod mechanically connecting the container body with the main body is installed, and when the container lid closes the container body, the container lid presses the push rod. 
     Specifically, in U.S. Pat. No. 6,910,800, a link is configured to be vertically long along a side surface of the container body, and when the container lid located at the upper side is closed, a protrusion of the container lid presses the upper end of the link downward to move the lower end of the link downward such that the container lid of the container body can be mechanically detected. 
     In addition, U.S. Pat. No. 7,871,196, a link configured to transmit whether the container lid of the container body is closed is not provided vertically on a side surface of the container body, but is provided inside a handle of the container body. That is, a push rod installed to be vertically long is installed in a groove of an inside of a handle, and when the push rod is moved downward due to the closure of the container lid from the upper side, a lower switch provided at the lower side is activated by the push rod to detect the closure of the container lid. 
     However, in such a prior art, a separate push rod or push block is required to be installed, and a link or push rod configured to be vertically long is required to be installed according to the length of the container body, and thus manufacturing and assembling thereof are difficult. Furthermore, the link or push rod may lose its detection function due to wear or damage thereto caused by frequent use, and may cause a detection failure (a signal transmission failure) due to the twisting or bending of the link or push rod which is considerably long. 
     Furthermore, the push rod and a push detection part are required to be installed separately from each other, and the push detection part may be contaminated by moisture or food introduced thereinto. The push rod of the container body and the push detection part of the main body are required to be installed at positions corresponding to each other, so there is a problem in that the container body is required to be mounted only in a specific direction. 
     In addition, in a connection structure in which a mechanical structure (or a wire) like the prior art is used to transmit a signal to the upper and lower side of the container body, when the container body is formed to be transparent or translucent, at least a portion of the container body is required to be opaque such that a transmission equipment or wire is invisible from the outside, so the degree of freedom in design is reduced. 
     Additionally, in a method in which a mechanical structure (or a wire) is used, water scale or external contaminants build up in the gap of a part in which the structure is attached to or detached from, thereby causing contamination and water introduction therein. 
     In addition, in the conventional method in which a structure for a signal transmission is provided in the handle, the structure of the handle is complex, and since the structure is required to be installed in the narrow inner space of the handle, the assembly of the handle is difficult and repair thereof is also difficult during malfunction thereof. Furthermore, the structure for a signal transmission is required to be installed vertically through the handle, and the upper and lower ends of the handle are constantly required to be attached to the container body, so the degree of freedom in the design of the handle (the configuration of removing the lower end of the handle from the container body, etc.) decreases. 
     Accordingly, to solve such a problem, in European Patent No. EP2548485, there is a blender in which when a container lid closes a container body, a main body recognizes the closure of the container lid of the container body by using a wireless communication module. 
     However, in such a prior art, the wireless communication module is required between the container body and the main body, and a separate power supply (a battery or dry cell, etc.) is required to be provided in the container body so as to drive the wireless communication module. 
     In addition, there is a problem in that communication confusion occurs due to a plurality of communication and a communication error occurs. That is, wireless power transmission or wireless communication between the main body and an external electrical supply device (a cooktop, etc.) is required, and further, it is also required to transmit whether the closure of the container lid is detected by wireless communication between the container body and the main body, so communication confusion may occur. 
     Due to these prior problems, in US Patent Application Publication No. 2018-0020875, there has been recently disclosed an interlocking blending device in which a pair of transmission and reception coils are disposed in a main body, and a pair of reception and transmission coils corresponding to the coils are disposed in a container body, and when a container lid closes the container body, power is transmitted to the reception coil of the container body by the transmission coil of the main body, and in turn, is transmitted to the reception coil of the main body by the transmission coil of the container body such that the main body recognizes the closure of the container lid of the container body. 
     That is, in US Patent Application Publication No. 2018-0020875, there is disclosed a structure in which a push rod is installed vertically along the side surface of the container body, and a detection signal of the container lid is mechanically transmitted to the lower side of the container body, and according to whether a switch of the upper side of the container body is turned on or off by the container lid, a circuit connected to the lower part of the container body is closed or opened such that the signal is or is not transmitted to a base. 
     However, even in such a prior art, each of the main body and the container body is required to have two coils, that is, the transmission coil and the reception coil, and a device which analyzes the power received by the reception coil of the main body is required. 
     Furthermore, the two coils are disposed in each of the main body and the container body, and when current flows through each of the coils, change in the induced current occurs due to interference between magnetic fields induced in the coils, so it is difficult to accurately analyze the power received by the reception coil of the main body. 
     In addition, the transmission coil of the main body transmits the power to the reception coil of the container body, and due to the closure of the container lid, the transmission coil of the container body transmits the power to the reception coil of the main body. Thus, there is a problem in that the transmission coil of the main body is required to transmit high power to the reception coil of the container body such that the reception coil of the main body receives a significant power. 
     Additionally, for connection between two switches located on the upper end portion of the container body and electrical signal transmission between the upper end lower ends of the container body, a connection wire is installed at the circumference of the upper end of the container body, and a connection is installed to connect the upper and lower ends of the container body to each other. 
     Accordingly, such connection wires are installed on the circumference of the upper end of the container body and vertically on the side surface of the container body, respectively, and thus spoil the appearance of the container body made of a transparent material. That is, the connection wire for electrical signal transmission is installed on the surface of the container body, and thus may be cut by interference, or the appearance of the container body is spoiled due to installation of the connection wire which is colored on the transparent container body. 
     Meanwhile, in such a prior art, the container lid is configured as a single part, so there is a problem in that when introducing the food into the container body, the entirety of the container lid is required to be opened. Furthermore, the handle is made of a single material or of the same material as the material of the container body, so there is a problem in that the handle gives a crude or rough look to a user. 
     In addition, the container body and the main body are in contact with each other with portions of the container body and the main body separated from each other, so when foreign matter is introduced in a gap between the container body and the main body, the power or signal transmission is not performed properly. 
     SUMMARY 
     Accordingly, the present disclosure has been made to solve the above problems occurring in the prior art, and is intended to propose a blender in which a detection signal of the closure of the container lid of a container body is electrically transmitted to a main body. 
     The present disclosure is intended to propose a blender in which detection error or contamination due to external contaminants such as water or food is prevented. 
     The present disclosure is intended to propose a blender in which an electrical or signal transmission part provided in the container body is blocked to the outside. 
     The present disclosure is intended to propose a blender in which the installation and follow-up service of an electrical or signal transmission part provided in the container body is facilitated. 
     Technical Solution 
     In order to accomplish the above objectives, according to one aspect of a blender of the present disclosure, the blender of the present disclosure may include a detection system configured to detect whether a container lid is mounted via an electrical signal. 
     In the blender of the present disclosure, a coil holder may be provided between a bottom surface of an outer container body and a lower surface of the inner container body. Accordingly, foreign matter may be prevented from being introduced to the coil holder from the outside. 
     In the blender of the present disclosure, a coil may be formed, or the coil holder which enables the transmission or reception of a signal may have a shape of a circular ring. Accordingly, even when power of a motor assembly of the main body is transmitted to a blade assembly located inside the container body, the interference of the coil holder therewith may be prevented. 
     In the blender of the present disclosure, a power reception part configured to receive power supplied from the main body and a signal transmission part configured to emit light by electricity may be provided in the coil holder. 
     In the blender of the present disclosure, the coil holder provided with the power reception part and the signal transmission part may be covered by an upper cover and a lower cover. 
     In the blender of the present disclosure, the upper cover and the lower cover covering the coil holder may be fastened to each other by a hook. 
     In the blender of the present disclosure, the power reception part and the signal transmission part may be installed on the left and right ends, respectively, of the coil holder or on the right and left ends thereof, respectively, such that the power reception part and the signal transmission part are spaced apart from each other. 
     In addition, the power reception part and the signal transmission part may be installed on an end of the coil holder such that the power reception part and the signal transmission part are close to each other. 
     Furthermore, the power reception part may include an induction coil which receives power by induced electromotive force. 
     The signal transmission part may include an LED which generates light. 
     The power reception part and the signal transmission part may be electrically connected to each other by a printed circuit board. 
     Additionally, in the blender of the present disclosure, the detection system configured to detect whether the container lid is mounted to the container body may be provided, wherein the detection system may include a transparent electrode film which guides the flow of electricity, and the coil holder may have a holder terminal provided on an end thereof, the lower end of the transparent electrode film being fitted into and connected to the holder terminal. 
     An upper edge may be formed on the outer circumferential surface of the upper cover by vertically bending downward and extending, and an upper hole edge may be formed in a center hole of the upper cover by extending downward, the upper hole edge corresponding to the upper edge. 
     The outer edge of the lower cover may bend vertically upward to constitute a lower edge, and the inner hole edge of the lower cover may protrude upward to constitute a lower hole edge. 
     The upper edge and upper hole edge of the upper cover may be formed to be stepped such that an edge step part and a hole step part are formed, and the lower edge and lower hole edge of the lower cover may be seated on the edge step part and the hole step part, respectively. 
     A terminal holder may be formed on an end of the upper cover by protruding upward therefrom, the holder terminal of the coil holder being received in the terminal holder. 
     The upper cover or the lower cover may include a holding guide piece formed by protruding downward or upward, respectively, therefrom, and the coil holder may include a holding groove through which the holding guide piece passes. 
     A hook passing groove in which a hook formed on the upper cover or the lower cover passes through or received may be formed in the coil holder. 
     According to such a configuration, the coil holder may be securely held by the covers. 
     Advantageous Effects 
     The blender of the present disclosure has the following effects. 
     First, in the blender of the present disclosure, an electrical circuit formed in the container body may be configured to be opened or closed according to whether the container lid is closed such that the closure of the container lid is electrically detected. Accordingly, the blender of the present disclosure may perform precise detection even during long-term use compared to a mechanical detection of the prior art. 
     Second, in the blender of the present disclosure, a coil may be formed, or the coil holder which enables the transmission or reception of a signal may be provided between the bottom surface of the outer container body and the lower surface of the inner container body. Accordingly, foreign matter may be prevented from being introduced to the coil holder from the inside or outside of the container body such that electrical signal transmission and power transmission are not prevented. 
     Third, in the blender of the present disclosure, a coil may be formed, or the coil holder which enables the transmission or reception of a signal may have a shape of a circular ring. Accordingly, power of the motor assembly of the main body may be transmitted to the blade assembly located inside the container body through a center hole of the coil holder, thereby preventing the interference of a rotating shaft of the motor assembly with the coil holder. 
     Fourth, in the blender of the present disclosure, the power reception part configured to receive power supplied from the main body and the signal transmission part configured to emit light by electricity may be provided in the coil holder. Accordingly, due to the mounting of the coil holder, the power reception part and the signal transmission part may be installed at precise positions, respectively, thereby improving workability. 
     Fifth, in the blender of the present disclosure, the coil holder may be covered by an upper cover and a lower cover, and edges corresponding to each other may be formed on the upper cover and the lower cover, respectively, the edges being formed at upper and lower sides, respectively, to overlap each other. Accordingly, the power reception part and the signal transmission part may be protected by being completely blocked from the outside, thereby preventing malfunction thereof due to the stable performances of the transmission and reception of a signal. 
     Sixth, in the blender of the present disclosure, the power reception part and the signal transmission part may be installed on the left and right ends, respectively, of the coil holder or on the right and left ends thereof, respectively, such that the power reception part and the signal transmission part are spaced apart from each other. Alternatively, the power reception part and the signal transmission part may be installed on one side of the coil holder. The power reception part and the signal transmission part may be electrically connected to each other by a printed circuit board. Accordingly, the use of narrow space in which the container body and the main body are coupled to each other may be easy, thereby enabling the configuration of a compact product. 
     Seventh, in the blender of the present disclosure, the holder terminal may be provided on an end of the coil holder, a lower end of a transparent electrode film being fitted into and connected to a holder terminal. Accordingly, due to the fitting of the lower end of the transparent electrode film to the holder terminal, the transparent electrode film, and the power reception part and the signal transmission part provided in the coil holder may be electrically connected to each other, thereby facilitating assembling and disassembling thereof. 
     Eighth, in the blender of the present disclosure, the upper cover or the lower cover may include a holding guide piece formed by protruding downward or upward, respectively, therefrom, and the coil holder may include a holding groove through which the holding guide piece passes. Accordingly, the coil holder mounted inside the upper and lower covers may be accurately held at a precise position and assembly thereof may be easy. 
     Ninth, in the blender of the present disclosure, the upper cover and the lower cover covering the coil holder may be coupled to each other by hooks. Accordingly, the assembling and disassembling of the coil holder may be easy, and thus the efficiency of a follow-up service thereof may be improved. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a configuration of a blender according to an exemplary embodiment of the present disclosure. 
         FIG. 2  is a vertical sectional view illustrating an internal configuration of the blender according to the embodiment of the present disclosure. 
         FIG. 3  is an exploded perspective view illustrating a detailed configuration of a container body according to an embodiment of the present disclosure 
         FIG. 4  is a perspective view illustrating a configuration of an outer container body constituting the blender according to an embodiment of the present disclosure. 
         FIG. 5  is a partial cross-sectional view illustrating a detailed configuration of a film guide of the outer container body constituting the blender according to the embodiment of the present disclosure. 
         FIG. 6  is a perspective view illustrating a detailed configuration of a reed switch constituting the blender according to an embodiment of the present disclosure. 
         FIG. 7  is a partial sectional view illustrating a mounted state of the reed switch constituting the blender according to the embodiment of the present disclosure. 
         FIG. 8  is an upper perspective view of a coil holder constituting the blender according to an embodiment of the present disclosure. 
         FIG. 9  is a lower perspective view of the coil holder constituting the blender according to the embodiment of the present disclosure. 
         FIG. 10  is an upper exploded perspective view illustrating a detailed configuration of a coil holder assembly constituting the blender according to an embodiment of the present disclosure. 
         FIG. 11  is a lower exploded perspective view illustrating a detailed configuration of the coil holder assembly constituting the blender according to the embodiment of the present disclosure. 
         FIG. 12  is a perspective view of a container lid constituting the blender according to an embodiment of the present disclosure. 
         FIG. 13  is a cut-away perspective view of the container lid constituting the blender according to the embodiment of the present disclosure. 
         FIG. 14  is an exploded perspective view of the container lid constituting the blender according to the embodiment of the present disclosure. 
         FIG. 15  is an exploded cut-away perspective view of the container lid constituting the blender according to the embodiment of the present disclosure. 
         FIG. 16  is a lower perspective view of the container body constituting the blender according to an embodiment of the present disclosure. 
         FIG. 17  is a perspective view of a main body constituting the blender according to an embodiment of the present disclosure. 
         FIG. 18  is an exploded perspective view illustrating a configuration of an upper half of the main body constituting the blender according to the embodiment of the present disclosure. 
         FIG. 19  is illustrating a configuration of the main body in a state in which a cover is removed from the main body constituting the blender according to the embodiment of the present disclosure. 
         FIG. 20  is a perspective view of a power transmission means constituting the blender according to the embodiment of the present disclosure. 
         FIG. 21  is an exploded perspective view illustrating a mutual arrangement of a power transmission part and the coil holder constituting the blender according to the embodiment of the present disclosure. 
         FIG. 22  is an exploded front view illustrating the mutual arrangement of the power transmission part and the coil holder constituting the blender according to the embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, a blender of the present disclosure will be described in detail with reference to the accompanying drawings. 
       FIGS. 1 and 2  are a perspective view and a vertical sectional view, respectively, illustrating a configuration of the blender according to an embodiment of the present disclosure. 
     As illustrated in these drawings, the blender of the present disclosure may include a container body  100  located relatively at an upper side thereof and receiving food, and a main body  500  provided at a lower side of the container body  100  and supporting the container body  100 . 
     The container body  100  may be a part in which the food is received and the process of cutting or crushing the food occurs, and the main body  500  may support the container body  100 . Furthermore, multiple parts may be provided inside such a main body  500  to control the cutting or crushing of the food received in the container body  100 , or to supply electric power. 
     The container body  100  may have a cylindrical shape as a whole, and an upper surface thereof may be configured to be open to introduce the food thereinto. 
     The container body  100  may be made of a transparent material such that an inside thereof can be seen from the outside. That is, the container body  100  may be made of glass or transparent plastic so that a user can check the state of the food contained inside the container body  100  from the outside. 
     A blade assembly  200  may be provided in an inner lower portion of the container body  100 . The blade assembly  200  may have multiple blades mounted rotatably thereto such that the blades chop or crush the food received in the container body  100 . 
     The blade assembly  200  may be connected to a motor assembly  600  to be described below, and be configured to be rotated by a rotational force generated by the motor assembly  600 . 
     The container body  100  may be formed doubly. That is, the container body  100  may be composed of an outer container body  110  constituting the appearance thereof and an inner container body  120  provided inside the outer container body  110 . When the outer container body  110  and the inner container body  120  can be configured to be in contact with each other or to be spaced apart from each other by a predetermined distance from each other, only a portion of each of the outer container body  110  and the inner container body  120  may be configured to be in contact with each other. 
     At least one inner guide  122  may be provided in the container body  100  to have a predetermined length in a vertical direction. The inner guides  122  are intended to guide the food rotating in the container body  100 , and may be configured in pairs symmetrical to each other in the front and rear or left and right of the inner container body  120 . 
     A handle  300  grasped by a user may be formed by protruding from a right surface of the container body  100  to the right side. Such a handle  300  may be formed such that the user can grasp the handle with one hand, and in the present disclosure, an upper end of the handle is illustrated to be connected integrally to an upper surface of the container body  100 . 
     Meanwhile, a spout  210  may be formed at the opposite side to the handle  300 . 
     As illustrated in the drawing, the spout  210  may be formed on the upper end of a left surface of the container body  100 , and may be a part through which the food completely crushed in the container body  100  is guided to be easily poured to the outside. Accordingly, such a spout  210  may be formed to gradually more protrude in the left direction going upward. 
     The upper surface of the container body  100  may be covered by a container lid  400 . That is, the container lid  400  may be removably mounted to the upper surface of the container body  100 , and open and close the upper surface of the container body  100 . 
     The container lid  400  may cover the upper surface of the container body  100  such that the food contained in the container body  100  does not spill to the outside and foreign matter of the outside is not introduced into the container body  100 . 
     The container lid  400  may be configured to be mounted to the container body  100  by pressing or rotating the container lid  400  the user. A gasket  402  may be provided in an outer circumferential surface of the container lid  400  and block a gap between the container lid  400  and the container body  100 . Of course, such a gasket  402  may function to allow the container lid  400  to be pressed and fitted to the container body  100 . 
     A cap  450  may be provided in the container lid  400 . That is, a lid hole  401  which is a circular hole having a predetermined size may be formed vertically through the center of the container lid  400 , and the cap  450  may be mounted to such a lid hole  401  and cover the lid hole  401 . 
     As illustrated in the drawings, the cap  450  may be installed at the center of the container lid  400 , and as a whole, may be formed to have a diameter smaller than a diameter of the container lid  400 . The cap  450  may be removably mounted to the container lid  400  by forcible fitting by pressing or by rotating. 
     In the present disclosure, it is illustrated that the cap  450  is configured to be attached and detached from the container lid  400  by being rotated, and a detailed configuration thereof will be described below. 
     Since the cap  450  may be removably mounted to the container lid  400 , the user may see the food contained inside the container body  100  by opening only the cap  450  without opening the container lid  400 , and insert food into the container body  100  by opening the cap  450 , or insert a mixing rod thereinto and stir the food contained inside the container body  100 . 
     The upper end of the cap  450  may be configured by protruding toward an upper side more than the upper end of the container lid  400 , so the cap  450  may function as a handle of the container lid to be grasped by the user when the user opens or closes the container lid  400 . 
     As illustrated in the drawings, the main body  500  may be configured to have a hexahedral shape having the shape of a rectangular barrel as a whole and be provided under the container body  100  so as to support the container body  100 , wherein the motor assembly  600  and multiple electronic parts such as a PCB (a printed circuit board) may be installed inside the main body  500 . Of course, the external shape of such a main body  500  may be variously changed as required. 
     The motor assembly  600  may be provided at a center of an inside of the main body  500 . The motor assembly  600  may generate a rotational force by power supplied from the outside so that the blades constituting the blade assembly  200  rotate. 
     Accordingly, a lower end of the blade assembly  200  may be connected to an upper end of the motor assembly  600 . 
     A knob  502  may be provided on a front surface of the main body  500  by protruding forward therefrom. The knob  502  is intended to set an operation of the blender of the present disclosure, and may be rotatably mounted to the main body  500 . 
     The knob  502  may be configured to control the operation intensity of the motor assembly  600 . That is, the knob  502  may be configured to change the rotational speed of the motor assembly  600  to high speed or low speed by the clockwise or counterclockwise rotation of the knob  502 . 
     Meanwhile, a manipulation part  504  may be provided on the upper surface of the main body  500 . 
     The manipulation part  504  is intended to manipulate the blender of the present disclosure by touching, and may be configured to manipulate the starting and stopping of the operation of the blender. 
     Of course, the knob  502  and the manipulation part  504  may be configured to selectively set or manipulate the operation of the blender, or may be configured to overlap with each other in the functions of the setting and manipulating. That is, for convenience, the knob  502  and the manipulation part  504  may be configured to overlap with each other in the functions such that the user may select any one of the knob  502  or the manipulation part  504  to set or manipulate the operation of the blender. 
     A display part  506  may be provided at a side of the manipulation part  504  (a left side in  FIG. 1 ). That is, the display part  506  may be provided on the upper surface of the main body  500 . Such a display part  506  may function to display the state of the operation of the blender such that the user can check the state thereof. Accordingly, such a display part  506  may be configured as a seven-segment display. 
     A cooling fan  610  may be provided at a lower side of the motor assembly  600 . 
     The cooling fan  610  may be connected to the lower end of the motor assembly  600  and be rotated by a rotating force generated by the motor assembly  600 , thereby introducing an outside air into the main body  500  and forcing the flow of the air. Accordingly, the cooling fan  610  may allow air to be introduced into the main body  500  from the outside and to flow therein, and function to cool parts such as the PCB provided in the main body  500 . 
     A base end  510  may be provided on the lower surface of the main body  500 . 
     The base end  510  may be formed by protruding downward from the lower surface of the main body  500  and may have a space having a predetermined size therein to receive a wireless power module  520 . The wireless power module  520  may function to receive external wireless power in a wireless method using induced electromotive force and to supply the wireless power to the motor assembly  600  provided inside the main body  500 . 
     Meanwhile, a detection system may be provided in the main body  500  and the container body  100  described above so as to detect whether the container lid  400  is mounted to the container body  100 . 
     The detection system may allow an electric circuit (not shown) which can be turned on and off to be formed in the container body  100 , and allow such an electric circuit to form a closed circuit, so that the detection system may be configured to detect whether electric current flows in the closed circuit by voltage supplied by the main body  500 . 
     More particularly, the detection system may include: a power transmission part  700  provided in the main body  500  and supplying power to the container body  100 ; a power reception part  220  provided in the container body  100  and receiving the power supplied by the power transmission part  700 ; an on/off part  230  provided at the upper side of the container body  100  and turning on/off the electric circuit formed in the container body  100  depending on whether the container lid  400  is closed; a transparent electrode film  240  made of a transparent material provided on a surface of the container body  100  and connecting the power reception part  220  and the on/off part  230  to each other so as to allow electricity to flow therebetween; and a detection part  800  provided on one side of the main body  500  or the container body  100  and allowing the electric circuit formed by the connection of the power reception part  220  with the on/off part  230  to form the closed circuit so as to detect whether the current flows. 
     The power transmission part  700  is intended to transmit power, which is introduced to the main body  500  from the outside of the main body  500  or stored in advance in the main body  500 , to the container body  100 , and may use an induction coil in which the induced electromotive force can be generated. 
     The power reception part  220  is intended to receive the power transmitted from the main body  500 , and may be configured to have a structure corresponding to the structure of the power transmission part  700 . That is, the power reception part  220  may use the coil such that the power is transmitted by the induced electromotive force generated between the power transmission part  700  and the power reception part  220 . 
     The power transmission part  700  and the power reception part  220  may be located to be adjacent to each other so as to generate the induced electromotive force. Accordingly, in the present disclosure, the power transmission part  700  is illustrated to be mounted to the right upper end of the main body  500 , and the power reception part  220  is illustrated to be mounted to the right lower end of the container body  100 . 
     The on/off part  230  may be configured to turn on/off the electric circuit (not shown) formed in the container body  100  depending on whether the container lid  400  is mounted to the container body  100 , and may include a permanent magnet  232  and a reed switch  234  provided in the container lid  400  and the container body  100 , respectively. 
     As illustrated in  FIG. 2 , in the present disclosure, the permanent magnet  232  is illustrated to be mounted to the right edge of the container lid  400 , and the reed switch  234  is illustrated to be mounted to the right upper end (a portion of the handle) of the container body  100 . 
     More particularly, the reed switch  234  may be mounted to be received in a reed switch groove  236  formed in the upper end portion of the handle  300 . 
     It is widely known that the reed switch has magnetic movable contacts enclosed in a glass tube, and when a magnet approaches the reed switch, the contacts in the glass tube are turned on. Here, further detailed description of the configuration and principle of the reed switch will be omitted. 
     Of course, except for the use of the permanent magnet  232  and the reed switch  234  of such an on/off part  230 , other electric on/off part or mechanical structures may be used to turn on/off the electric circuit, and the mounting positions of the permanent magnet  232  and the reed switch  234  respectively mounted to the container lid  400  and the container body  100  may be exchanged oppositely. 
     Various types of electrical devices or structures having a function that can detect whether electric current flows in the electric circuit formed in the container body  100  turned on/off by the on/off part  230  may be used as the detection part  800 . However, in the present disclosure, a photosensor is used to detect light as an example. 
     Accordingly, the detection part  800  may include a signal transmission part  810  provided in the container body  100  to generate light, and a signal reception part  820  provided in the main body  500  to receive the light transmitted by the signal transmission part  810 . 
     The signal transmission part  810  and the signal reception part  820  may be located at positions adjacent to each other. In the present disclosure, as illustrated in  FIG. 2 , the signal transmission part  810  may be located on the left lower end of the container body  100 , and the signal reception part  820  may be located on the left upper end of the main body  500 . 
     The signal transmission part  810  may use an LED (light emitting diode) that emits light by electricity, and the signal reception part  820  may use the photosensor that receives light and changes the light into an electrical signal. That is, a light transmission module provided with an LED configured to generate light by electricity may be used as the signal transmission part  810 , and a light reception module configured to convert light received by a photosensor into an electrical signal may be used as the signal reception part  820 . 
     In addition, the transparent electrode film  240  may be provided between the outer container body  110  and the inner container body  120 . More particularly, the transparent electrode film  240  may be attached to the inner surface of the outer container body  110 . 
     The transparent electrode film  240  may be made of a transparent material such as an ITO film (an indium-tin oxide film) and may be attached to the surface of the container body  100 , and may allow the on/off part  230  provided on the upper side of the container body  100  to be connected to the power reception part  220  and the signal transmission part  810  provided on the lower end portion of the container body  100  so as to form the electric circuit. 
     Accordingly, the transparent electrode film  240  may be attached vertically and longitudinally on the surface of the container body  100  made of a transparent material and may function to guide the transmission of the electrical signal between the upper end and lower end of the container body  100 . 
     Accordingly, when the container body  100  is made of the transparent material, and the transparent electrode film  240  is also made of the transparent material, the transparent electrode film  240  may not be visually exposed, so the transparent material does not spoil the appearance of the container body  100  and may maintain the design thereof. 
     Furthermore, when the transparent electrode film  240  is attached to the surface of the container body  100 , the transparent electrode film  240  may have a hole formed therein to remove air bubbles that may be generated between the attached surfaces. That is, a perforated hole may be added to the center of the transparent electrode film  240  made of the ITO film to allow the air bubbles to escape therethrough such that the generation of the air bubbles is prevented. 
     Meanwhile, a seating step  900  may be formed on the upper surface of the main body  500  by protruding upward therefrom. 
     The seating step  900  may be configured to have a circular shape corresponding to a shape of the lower end of the container body  100  such that the lower end of the container body  100  is mounted to the seating step  900  to be vertically removed therefrom. 
     In addition, the container body  100  may be formed doubly. That is, the container body  100  may be composed of the outer container body  110  and the inner container body  120 , and the inner guide  122  may be formed on the inner surface of the inner container body  120  by protruding inward therefrom. 
     Hereinafter, the configuration of the container body  100  will be described in detail. 
     In  FIGS. 3 to 15 , a configuration of each of the container body  100  and the container lid  400  is illustrated in detail. That is,  FIG. 3  illustrates an exploded perspective view of the container body  100 ,  FIG. 4  illustrates a perspective view of a configuration of an outer container body constituting the blender according to the embodiment of the present disclosure, and  FIG. 5  illustrates a partial cross-sectional view showing a detailed configuration of a film guide of the outer container body constituting the blender according to the embodiment of the present disclosure. 
     In addition,  FIGS. 6 and 7  illustrate a perspective view of a detailed configuration of a reed switch constituting the blender according to the embodiment of the present disclosure and a partial sectional view of a mounted state of the reed switch, respectively, and  FIGS. 8 and 9  illustrate upper and lower perspective views, respectively, of a configuration of a coil holder. 
     In addition,  FIGS. 10 and 11  illustrate upper and lower exploded perspective views, respectively, of a detailed configuration of a coil holder assembly constituting the blender according to the embodiment of the present disclosure,  FIGS. 12 and 13  illustrate a perspective view and a cut-away perspective view of a container lid  400 , respectively, and  FIGS. 14 and 15  illustrate an exploded perspective view and an exploded cut-away perspective view, respectively, of the container lid  400 .  FIG. 16  is a lower perspective view of a container body  100 . 
     As illustrated in these drawings, the container body  100  may be doubly configured to have a cylindrical shape as a whole. That is, the container body  100  may include an outer container body  110  constituting the appearance thereof, and an inner container body  120  provided inside the outer container body  110 . 
     The container body  100 , that is, the outer container body  110  and the inner container body  120  may be made of a transparent material. That is, the container body  100  may be made of a transparent material such as glass, Tritan, or transparent plastic so that a user can check the state of the food contained inside the container body  100  from the outside. 
     The outer container body  110  may constitute the appearance of the container body, and be configured to have a cylindrical shape with the same top and bottom sizes, and a main handle  302  may be formed at the outer right surface thereof by protruding therefrom to the right such that a user can grasp the handle. 
     The main handle  302  may be formed to have an L shape, and the upper end portion thereof may be connected to the right upper end of the outer container body  110 . The main handle  302  may be formed integrally with the outer container body  110  by injection molding. Accordingly, the main handle  302  formed integrally with the outer container body  110  may have improved strength and durability compared to the main handle formed as a part separate from the outer container body  110  to be fixed thereto. 
     A mounting end  235  having predetermined space therein may be formed at a portion at which the main handle  302  is connected to the container body  100 . The mounting end  235  may be a part in which the reed switch  234  is installed. 
     The reed switch groove  236  receiving the reed switch  234  may be formed inside the mounting end  235 . That is, the reed switch groove  236  may be formed in the upper end of the main handle  302 , and may provide a space to mount the reed switch  234  therein, and the left of such a reed switch groove  236  may be open. 
     More specifically, the mounting end  235  may include a bottom surface  235   a  formed by bending vertically to a side from the side surface of the outer container body  110  and extending, and a side surface  235   b  formed by bending vertically upward from the right end of the bottom surface  235   a  and extending. 
     Accordingly, the reed switch groove  236  having a predetermined size may be formed at the upper side of the bottom surface  235   a , and the upper portion of the reed switch groove may be covered by a covering end  124  extending laterally from the upper end of the inner container body  120 , and the left of the reed switch groove may be open such that the transparent electrode film  240  can connect to the reed switch. 
     A pair of mounting ribs  238  spaced apart by a predetermined distance from each other may be formed on the bottom surface  235   a  by protruding upward therefrom such that the pair of mounting ribs have predetermined heights, and the reed switch  234  may be fixedly mounted between the pair of mounting ribs  238 . 
     Specifically, the reed switch  234  may be composed of a switch part  234   a  provided with a switch, and a support piece  234   b  supporting the switch part  234   a.    
     As illustrated in  FIG. 7 , the support piece  234   b  may be configured as a flat plate having a predetermined thickness, and may be vertically installed in the reed switch groove  236  so as to fixedly support the switch part  234   a . That is, the lower end of the support piece  234   b  may be fitted and held between the pair of mounting ribs  238 . Accordingly, the lower end of the support piece  234   b  is preferably configured to have a size corresponding to a gap between the pair of mounting ribs  238 . 
     More preferably, the lower end of the support piece  234   b  may be forcibly fitted into the gap between the pair of mounting ribs  238 . 
     As illustrated in  FIG. 7 , the switch part  234   a  may be installed by protruding leftward from the support piece  234   b , and the upper end of the transparent electrode film  240  may be connected to the left end of such a switch part  234   a.    
     In addition, a support protrusion  234   c  may be formed on an end of the support piece  234   b . As illustrated in  FIG. 6 , the support protrusion  234   c  may be formed by protruding by a predetermined height from the left or right end of the support piece  234   b  such that the reed switch  234  can be easily mounted to the mounting end  235  or the covering end  124  of the inner container body  120 . 
     An outer handle  304  and an inner handle  306  may be provided on the outer sides of the main handle  302 . That is, as illustrated in  FIG. 3 , the outer handle  304  may be provided at the right of the inner handle  306 , and the inner handle  306  may be provided at the left of the main handle  302 . 
     More particularly, the outer handle  304  may also be configured to have an L shape as a whole as does the main handle  302 , so as to cover the upper surface, right surface, and front and rear surfaces of the main handle  302 . The outer handle  304  may be made of a material such as stainless steel that has a smooth surface and is resistant to rust, and may not break easily and look beautiful to a user. 
     The inner handle  306  may cover the left surface and lower surface of the main handle  302 , and may be configured to have an L shape so as to correspond to the left and lower surfaces of the main handle  302 , and at least a portion thereof may be made of an elastic material. 
     Particularly, the inner handle  306  may include a connection part  306   a  covering the lower part of the upper end of the main handle  302 , and a grasping part  306   b  extending downward from the connection part  306   a  and covering the left surface of the main handle  302 . 
     Like the outer handle  304 , the connection part  306   a  may be made of a smooth and strong material, and the grasping part  306   b  may be a part on which a user&#39;s fingers are wrapped, and be made of an elastic material. That is, the connection part  306   a  may be made of stainless steel, and the grasping part  306   b  may be made of an elastic material such as rubber that can give a user a soft touch since the four fingers (except for the thumb) of the user cover the grasping part. 
     The inner container body  120  may be configured to have a size (a diameter) smaller than a size (a diameter) of the outer container body  110  and may sit inside the outer container body  110 . 
     The inner container body  120  may be configured to have a cylindrical shape having an open upper part. More particularly, as illustrated in the drawings, the inner container body  120  may be configured to have a tapered shape having a diameter gradually decreasing going toward the lower side thereof. 
     In addition, the multiple inner guides  122  may be vertically formed on the inner surface of such an inner container body  120  as described above, and the blade assembly  200  may be mounted to the lower end of the inner container body  120 . 
     The spout  210  may be formed on the left upper end of the inner container body  120  by protruding therefrom to the left, and the covering end  124  may be formed on the right upper end of the inner container body  120  by extending therefrom to the right. 
     The covering end  124  may cover the upper surface of the reed switch groove  236  of the outer container body  110 . The covering end  124  may be configured to be a flat plate having a predetermined thickness, and to have width gradually decreasing going toward the right to correspond to the size of the upper end of the reed switch groove  236 . 
     The blade assembly  200  may be mounted to the lower end of the inner container body  120 . 
     The blade assembly  200  is intended to allow food to be finely crushed or mixed by the blades, and may include: a blade shaft  202  rotated by receiving the rotational force generated from the motor assembly  600 ; a blade body  204  provided at the outside of the blade shaft  202  and supporting the blade shaft  202 ; and at least one blade connected to the blade shaft  202  and crushing the food by rotating. 
     The coil holder assembly may be provided between the outer container body  110  and the inner container body  120 . 
     The coil holder assembly may include a coil holder  130  having an induction coil, and an upper cover  140  and a lower cover  150  covering the upper and lower sides of the coil holder  130 , respectively. 
     Particularly, the coil holder  130  may be provided between the bottom surface of the outer container body  110  and the lower surface of the inner container body  120 , and the power reception part  220  and the signal transmission part  810  may be mounted to such a coil holder  130 . 
     The entirety of the coil holder  130  may have the shape of a circular ring having a predetermined thickness, and the power reception part  220  may be provided at the right end of the coil holder  130  having such a ring shape. That is, although not shown in detail, the induction coil which receives power may be provided at the right end of the coil holder  130 , and constitute the power reception part  220 . 
     The power reception part  220  mounted to the coil holder  130  may be embodied with a reception induction coil patterned on the same plane as the PCB. That is, as illustrated in the drawing (see  FIG. 9 ) in the power reception part  220  according to the embodiment of the present disclosure, the reception induction coil provided on the lower surface of the coil holder  130  may be configured to be wound multiple times on the PCB in a spiral shape relative to a reception center point  224 . 
     In addition, the signal transmission part  810  may be provided on the lower surface of the coil holder  130 . 
     The signal transmission part  810  may emit light by power supplied from the power reception part  220 . The signal transmission part  810  may be configured as a part of the detection part  800 , and use the LED emitting light as described above. 
     The power reception part  220  and the signal transmission part  810  may be electrically connected to each other. That is, the power reception part  220  and the signal transmission part  810  may be configured to form the closed circuit in cooperation with the on/off part  230 . Accordingly, the power reception part  220  and the signal transmission part  810  provided in the coil holder  130 , and the on/off part  230  may be configured to be electrically connected to each other by the PCB. 
     As illustrated in the drawing, the power reception part  220  and the signal transmission part  810  may be installed on the right and left ends, respectively, of the coil holder  130  such that the power reception part  220  and the signal transmission part  810  are spaced apart from each other, and may be configured to be electrically connected to each other by a printed circuit board. Furthermore, the power reception part  220  and the signal transmission part  810  may be installed on any one of the right and left ends of the coil holder  130  and may be configured such that the power reception part  220  and the signal transmission part  810  are close to each other. 
     In addition, although not shown, the coil holder  130  may further include a conversion module that converts alternating current (AC) to direct current (DC). 
     The transparent electrode film  240  may be connected to the coil holder  130 . That is, an end of the transparent electrode film  240  constituting the detection system may be connected to an end of the coil holder  130 . 
     Specifically, a holder terminal  132  may be provided on the upper surface of the right end of the coil holder  130 , and such a holder terminal  132  may be a part to which the lower end of the transparent electrode film  240  is inserted and connected. 
     As illustrated in  FIG. 3 , the coil holder  130  may be configured to have an approximate ring shape as a whole, and the right end of the coil holder  130  may be configured to be relatively large in width such that the power reception part  220  may be mounted thereto. 
     Accordingly, when the coil holder  130  is configured in a ring shape, a hole may be formed in the center portion of the coil holder by passing vertically therethrough, and thus may provide a path through the blade assembly  200  and the motor assembly  600  are connected to each other. That is, without the interference of the motor assembly  600  with the coil holder  130 , the power of the motor assembly  600  may be transmitted to the blade assembly  200 . 
     Multiple grooves may be formed in the outer and inner circumferential surfaces of the coil holder  130 . Specifically, a holding groove  130   a  may be formed in each of the front end rear ends of the coil holder  130  by being recessed inward therefrom, and a hook passing groove  130   b  may be formed in each of the front and rear of the right end of the coil holder  130  and the inner side of a left end thereof. 
     The holding groove  130   a  may be a part through which a holding guide piece  148  to be described below is received and passes, and the hook passing groove  130   b  may be a part through which an upper hook  140   a  or a lower hook  150   a  to be described below is received or passes. 
     The coil holder  130  may be protected by the upper cover  140  and the lower cover  150 . That is, the upper cover  140  and the lower cover  150  may be provided on the upper surface and lower surface of the coil holder  130 , respectively, so as to cover the upper surface and lower surface thereof, the upper cover and lower cover having shapes corresponding to the upper surface and lower surface of the coil holder  130 , respectively. 
     A terminal holder  142  may be formed on the right end of the upper cover  140  by protruding upward therefrom to receive the holder terminal  132  of the coil holder  130  therein. Accordingly, the holder terminal  132  may be received in the terminal holder  142  by being introduced thereto from the lower side of the terminal holder  142 , and the upper part of such a terminal holder  142  may be formed to be partially open and may have a film hole  142   a  formed vertically through the terminal holder  142  such that the lower end of the transparent electrode film  240  passes therethrough. 
     The upper cover  140  may be configured to cover the coil holder  130 . Accordingly, an upper edge  144  may be formed on an outer circumferential surface of such an upper cover  140  by vertically bending downward and extending. The upper edge  144  may be configured to have a predetermined height and may cover the side surface of the coil holder  130 . 
     In addition, the upper cover  140  may also be configured to have a shape of a ring like the shape of the coil holder  130 , and an upper hole edge  146  may be formed in a center hole of the upper cover  140  by extending downward, the upper hole edge corresponding to the upper edge  144 . 
     The upper edge  144  and the upper hole edge  146  are formed to be stepped. That is, as illustrated in  FIG. 11 , an edge step part  144   a  formed to be stepped may be formed on the inner surface of the upper edge  144 , and a hole step part  146   a  formed to be stepped may be formed on the outer circumferential surface of the upper hole edge  146 . The edge step part  144   a  and the hole step part  146   a  may be parts on which a lower edge  152  and a lower hole edge  154 , respectively, of the lower cover  150  to be described below are seated. 
     A pair of rib grooves  142   b  may be formed on the right surface of the terminal holder  142  by being recessed leftward. That is, as illustrated in  FIG. 10 , the pair of rib grooves  142   b  may be formed on each of the right surface of the terminal holder  142  and the right surface of the upper edge  144 , and such rib grooves  142   b  may be parts in which a pair of guide ribs  162  to be described below is received. 
     The holding guide piece  148  may be formed on the lower surface of the upper cover  140  by protruding downward therefrom. That is, a pair of holding guide pieces  148  may be formed on the front and rear of the lower surface of the upper cover  140  by protruding by predetermined heights downward therefrom. Such holding guide pieces  148  are intended to support the coil holder  130  such that the coil holder  130  is securely held. 
     Of course, such holding guide pieces  148  may be formed on the lower cover  150  in addition to the upper cover  140 , and may be formed on the left and right of the upper cover  140  in addition to the front and rear of the upper cover  140 . Alternatively, one holding guide piece may be formed, and each of the holding guide pieces may be formed in various shapes such as quadrangular and circular shapes. 
     A hook may be formed on the upper cover  140  such that the upper cover  140  is coupled to the lower cover  150 . That is, as illustrated in  FIG. 11 , at least one upper hook  140   a  may be formed on each of the upper edge  144  and the upper hole edge  146 . Specifically, the upper hook  140   a  is illustrated to include three upper hooks, and may be formed on each of the left end of the upper hole edge  146  and the front and rear of the right end of the upper edge  144 . 
     The lower cover  150  may also have a ring shape as a whole like the upper cover  140 , and the outer edge of the lower cover  150  may bend vertically upward to constitute the lower edge  152 , and the inner hole edge of the lower cover may protrude upward to constitute the lower hole edge  154 . 
     The lower edge  152  and the lower hole edge  154  may be configured to have heights smaller than heights of the upper edge  144  and the upper hole edge  146 , and may be parts which are in contact with the edge step part  144   a  and the hole step part  146   a , respectively, formed in the upper cover  140  to be coupled thereto. 
     Three lower hooks  150   a  may be formed on the lower cover  150  by protruding upward therefrom. The lower hooks  150   a  may be coupled to the upper hooks  140   a , respectively, such that the upper cover  140  and the lower cover  150  are securely coupled to each other. Accordingly, the upper hooks  140   a  and the lower hooks  150   a  may have shapes corresponding to each other, and may be formed at upper and lower positions, respectively, corresponding to each other. 
     As described above, the transparent electrode film  240  may be made of a transparent material such as the ITO film, and may be configured to have length corresponding to the vertical length of the container body  100 . 
     The transparent electrode film  240  may be provided between the outer container body  110  and the inner container body  120 . Accordingly, when the transparent electrode film  240  is provided between the outer container body  110  and the inner container body  120 , the transparent electrode film  240  may be prevented from coming in contact with the food contained in the inner container body  120 , and may be prevented from coming in contact with foreign matter outside of the outer container body  110 . 
     The transparent electrode film  240  may be attached to the surface of the outer container body  110 , or the surface of the inner container body  120 . That is, the transparent electrode film  240  may be attached to the inner surface of the outer container body  110  or the outer surface (an outer circumferential surface) of the inner container body  120 . 
     Here, the transparent electrode film  240  attached vertically to the inner surface of the outer container body  110  will be described as an example. 
     As is illustrated in  FIG. 3 , the upper and lower ends of the transparent electrode film  240  may be bent at least one time. The lower end of the transparent electrode film  240  may pass through the terminal holder  142  of the upper cover  140  and be connected to the holder terminal  132  of the coil holder  130 , and the upper end of the transparent electrode film  240  may be connected to the reed switch  234 . 
     The film guide  160  may be formed vertically on the inner surface of the outer container body  110  to attach the transparent electrode film  240  thereto. That is, as illustrated in the drawing, the film guide  160  may be formed vertically and longitudinally on the right inner surface of the outer container body  110  and may guide the attachment of the transparent electrode film  240 . 
     The film guide  160  may be composed of the pair of guide ribs  162  formed by protruding to a side from the surface (an inner surface) of the outer container body  110 , and a guide surface  164  formed between the pair of guide ribs  162 . 
     As illustrated in  FIG. 5 , the guide ribs  162  may be configured as a pair of ribs having predetermined heights, and may be vertically formed to be parallel to each other such that a predetermined width is defined between the pair of ribs. 
     In addition, the guide surface  164  may be formed between the pair of guide ribs  162 , and is preferably configured as a flat surface. That is, since the inner container body  120  and the outer container body  110  have circular cross-sections, the side surface of the outer container body  110  may have a predetermined curvature. However, the guide surface  164  may be configured to have a flat surface. 
     Accordingly, the guide surface  164  may be configured as a flat surface such that the transparent electrode film  240  is easily attached to the guide surface  164 . That is, in order to easily attach the transparent electrode film  240  having a flat surface to the guide surface, the guide surface  164  is also preferably configured as a flat surface. 
     Meanwhile, the guide surface  164  may be formed by protruding from a side (an inner side) of the surface (the inner surface) of the outer container body  110  or by being recessed therefrom. That is, the guide surface  164  formed on the inner side surface of the outer container body  110  may be configured to have the same plane as the inner side surface of the outer container body  110 , but may be formed by protruding from the inner side of the inner surface of the outer container body  110 , or by being recessed outward from the inner surface of the outer container body  110 . 
     The guide surface  164  is preferably configured to have a width corresponding to the width of the transparent electrode film  240 . That is, the transparent electrode film  240  may be attached to the guide surface  164 , so the size of the width of such a guide surface  164  may be the same as the size of the width of the transparent electrode film  240 , or is preferably configured to be at least slightly larger than the size of the width of the transparent electrode film  240 . 
     As described above, the transparent electrode film  240  may be vertically and longitudinally attached to the film guide  160  formed on the inner surface of the outer container body  110 . 
     In addition, the transparent electrode film  240  may bend perpendicularly at a connection part A of the main handle  302  with the upper end of the outer container body  110 . In this case, to prevent the cutting of the transparent electrode film  240 , the connection part A is preferably configuredin an arc shape having a radius R of a predetermined size. That is, the connection part A at which the upper end of the right surface of the outer container body  110  and the bottom surface  235   a  of the mounting end  235  meet may be configured to have curvature such that the transparent electrode film  240  is effectively attached. 
     Meanwhile, a magnet groove  126  may be formed in the upper end of the inner container body  120  by being recessed therefrom to the outside so as to receive the permanent magnet  232  therein. That is, as illustrated in the drawing (see  FIG. 7 ) the upper end of the right surface of the inner container body  120  may be bent to be stepped to the right so as to form the magnet groove  126 , and such a magnet groove  126  may be a part in which the permanent magnet  232  and a magnet holder  404  to be described below are located. 
     In addition, it is preferable that the magnet groove  126  is formed at a side of the reed switch groove  236 . That is, as illustrated in the drawing (see  FIG. 7 ), the magnet groove  126  may be formed at the left of the reed switch groove  236  in which the reed switch  234  is received. Accordingly, the reed switch  234  received in the reed switch groove  236  and the permanent magnet  232  may be close to each other, so the reed switch  234  may be operated by the permanent magnet  232 . 
     The container lid  400  may be composed of an outer wall  410  configured in a shape of a circular ring and constituting the appearance of the container lid, an inner wall  420  provided to have a diameter smaller than a diameter of the outer wall  410  and having the lid hole  401  formed thereinside, and an upper surface  430  connecting an upper end of the outer wall  410  with an upper end of the inner wall  420 . 
     Specifically, the container lid  400  may have a shape of a circular ring, as a whole, having a hollow inner part having a predetermined width. That is, the container lid  400  may have the lid hole  401  to be described below formed therein by passing vertically therethrough, and may have the structure of a circular ring having a U-shaped section. 
     The container lid  400  is intended to cover the upper surface of the container body  100 , and the lid hole  401  may be formed vertically through the center portion of the container lid  400 , wherein the cap  450  may be mounted removably to the lid hole  401 . That is, as illustrated in  FIG. 13 , a hole may be formed vertically through the center portion of the container lid  400  to constitute the lid hole  401 , and the cap  450  may cover such a lid hole  401 . 
     The cap  450  may be composed of a top plate  460  exposed from the upper side of the container lid  400 , and a cap body  470  is received in the lid hole  401 . 
     As illustrated in  FIG. 13 , the cap body  470  may be configured in a shape of a truncated cone having a hollow inner part. That is, the cap body  470  may be configured in the shape of a truncated cone having a diameter gradually decreasing going upward. 
     The top plate  460  may cover the upper surface of the cap body  470  having a predetermined height, and as illustrated in the drawing, may be configured to have a diameter larger than a diameter of the upper end of the cap body  470 . 
     The cap body  470  may include a middle ring  472  formed by protruding outward therefrom and in contact with the inner surface of the upper end of the lid hole  401 , and a lower ring  474  formed by protruding outward from the outer circumferential surface of the lower end of the cap body and in contact with the inner surface of the lower end of the lid hole  401 . 
     Specifically, the middle ring  472  may be formed by protruding outward from the center portion of the cap body  470 , and may constitute the same plane as the upper surface  430  of the container lid  400  when the cap  450  is mounted to the container lid  400 . Accordingly, the upper part of the middle ring  472  may be exposed to the upper side of the container lid  400 . 
     An air groove  476  may be formed in the middle ring  472 . 
     The air groove  476  may allow air to flow to the upper and lower sides of the middle ring  472  of the cap  450 , and may be formed by being recessed inward from the outer circumferential surface of the middle ring  472  as illustrated in  FIG. 14 . 
     As illustrated in  FIG. 15 , the lower ring  474  may be formed by protruding by a predetermined size outward from the outer circumferential surface of the lower end of the cap body  470 , and the outer circumferential surface of such a lower ring  474  may be in contact with the inner circumferential surface of the lower end of the inner wall  420  of the container lid  400 . 
     As illustrated in  FIG. 15 , the outer wall  410  may be configured to correspond to a vertical size of the inner wall  420  or may be preferably configured to have a vertical size larger than the vertical size of the inner wall  420 . 
     In addition, the gasket  402  described above may be provided on the outer circumferential surface of the lower end of such an outer wall  410 . The gasket  402  is preferably made of an elastic material such as rubber. 
     A middle protrusion part  422  supporting the lower end of the middle ring  472  of the cap  450  may be formed on the inner surface of the inner wall  420 , and a lower protrusion part  424  in contact with the outer surface of the lower ring  474  may be formed by protruding inward from the inner surface of the inner wall  420 . 
     As illustrated in the drawing, the middle protrusion part  422  may be formed to have a predetermined thickness by protruding inward from the inner surface of the inner wall  420 . Such a middle protrusion part  422  is preferably configured by being divided into multiple middle protrusion parts. Accordingly, air may vertically flow through space between the multiple middle protrusion parts  422 . 
     The lower protrusion part  424  may be formed by protruding inward from the inner surface of the lower end part of the inner wall  420 , and as illustrated in  FIG. 15 , is preferably configured to protrude inward more than the middle protrusion part  422 . 
     Meanwhile, a fastening protrusion  478  may be formed on the lower end of the cap  450  by protruding outward therefrom, and a locking path  440  may be formed on the lower end of the inner wall  420  such that the fastening protrusion  478  is received in the locking path so as not to be removed therefrom. 
     More specifically, the fastening protrusion  478  may be formed on the outer circumferential surface of the lower ring  474  of the cap  450  by protruding outward therefrom. Such a fastening protrusion  478  is configured such that the cap  450  is not removed from the container lid  400  after being mounted thereto. 
     The locking path  440  may prevent the fastening protrusion  478  from being removed upward therefrom after the fastening protrusion  478  is received in the locking path  440 . The locking path  440  may be formed by being recessed outward from the inner circumferential surface of the lower protrusion part  424  of the inner wall  420 , and may be composed of an entrance groove  442  guiding the vertical movement of the fastening protrusion  478 , and a locking groove  444  formed by extending laterally from the lower end of the entrance groove  442  and preventing the upward removal of the fastening protrusion  478 . 
     That is, as illustrated in  FIG. 15 , a portion of the lower protrusion part  424  may be cut to form the entrance groove  442 , and the entrance groove  442  may be connected to the locking groove  444  formed by extending laterally by a predetermined length after such an entrance groove  442  extends downward and bends perpendicularly. 
     Accordingly, when the fastening protrusion  478  moves downward along the entrance groove  442 , moves laterally, and is received in the locking groove  444 , the fastening protrusion  478  may be prevented from being removed upward therefrom. 
     Of course, the entrance groove  442  and the locking groove  444  may function to define a gap between the cap  450  and the container lid  400 , and may function as an air flow path such that the air flows in the vertical direction of the container lid  400 . That is, air may flow to the inside and outside of the container body  100  through the locking path  440  and the air groove  476 . 
     Accordingly, the reason in which the air is allowed to flow to the inside and outside of the container body  100  with the locking path  440  and the air groove  476  not being located on the same vertical line is to prevent pressure difference between the inside and outside of such a container body  100 , and to prevent the ejection of the food contained in the container body  100  to the outside, since when the food inside the container body  100  is crushed or mixed, the inner pressure of the container body  100  may be different from an atmospheric pressure. 
     A magnet holder  404  may be provided on the outer circumferential surface of the container lid  400 . That is, as illustrated in the drawing, the magnet holder  404  may be formed on the outer circumferential surface of the container lid  400  by protruding therefrom to the outside, and have the permanent magnet  232  mounted therein. 
     The permanent magnet  232  is intended to control the turning on/off of the reed switch  234  when the container lid  400  is mounted to or removed from the container body  100 . 
     Meanwhile, the lower surface of the container body  100  may be configured to have a shape corresponding to a shape of the upper surface of the main body  500  such that the container body  100  may be easily attached to and detached from the upper surface of the main body  500 . 
     More particularly, the container body  100  may be mounted to a seating step  900  of the main body  500  to be described below. 
     Accordingly, the lower surface of the container body  100  may be configured to have the shape corresponding to the shape of the upper end of the main body  500 , so the container body  100  may be stably mounted to and removed from the main body  500 . 
     A container body end  170  having a predetermined width may be formed on the lower surface of the container body  100  by protruding downward therefrom. The container body end  170  may be a part which is in contact with the upper surface of a lower step  910  of the main body  500  to be described below, and may be configured to have a shape corresponding to the upper surface of the lower step  910 . 
     An upper step receiving groove  172  may be formed in the center of the lower surface of the container body  100  by being recessed upward therefrom. That is, the upper step receiving groove  172  may be formed by being recessed upward at the inner side of the container body end  170  of the container body  100 . When the container body  100  is mounted to the main body  500 , an upper step  920  of the main body  500  to be described below may be received in such an upper step receiving groove  172 . 
     The container body end  170  may have the shape of a circular ring having a partially open part, and the open part may be a part in which a coil seating part  940  to be described below is received. That is, the right end of the container body end  170  may be open and a coil seating part groove  170   a  may be formed therein. The coil seating part  940  to be described below may be received in such a coil seating part groove  170   a.    
     A circular end  174  may be formed on the center of the lower surface of the container body  100  by protruding downward therefrom. That is, the circular end  174  protruding downward may be provided in the center of the upper step receiving groove  172 . 
     As illustrated in the drawing, the circular end  174  may have the shape of a circular ring and be hollow therein, which may provide a passage connecting the blade assembly  200  to the motor assembly  600 . 
     The circular end  174  may be a part received in a circular end receiving groove  980  formed in the main body  500  to be described below. 
     Multiple mounting protrusions  174   a  may be formed on the outer circumferential surface of the circular end  174  by protruding radially therefrom. Each of the mounting protrusions  174   a  may function to tightly mount the container body  100  to the corresponding position of the main body  500  such that the container body  100  does not rotate. The mounting protrusion  174   a  may have at least one mounting protrusion  174   a.    
     In the present disclosure, the mounting protrusion  174   a  is illustrated to have four mounting protrusions  174   a . As illustrated in the drawing, such a mounting protrusion  174   a  may be formed to have thickness gradually decreasing toward the outside. This is intended to easily receive the mounting protrusions  174   a  in protrusion grooves  982  to be described below. 
     In  FIGS. 17 to 19 , a configuration of an upper half part of the main body  500  is illustrated in detail. That is,  FIG. 17  is a perspective view of the main body  500 ;  FIG. 18  is an exploded perspective view illustrating a configuration of the upper half part of the main body  500 ; and  FIG. 19  is a perspective view illustrating a configuration of the main body  500  from which the cover is removed. 
     As illustrated in these drawings, the seating step  900  may be provided on the upper surface of the main body  500  by protruding therefrom to be stepped upward such that the lower surface of the container body  100  is seated thereon. 
     The seating step  900  may be a part by which the lower end of the container body  100  is seated and be supported. Accordingly, such a seating step  900  may be configured to have the shape corresponding to the shape of the lower part of the container body  100 . 
     Particularly, the seating step  900  may be formed by being stepped, and may include the lower step  910  having a diameter corresponding to the diameter of the lower end of the container body  100 , and the upper step  920  formed by protruding upward from the lower step  910  and having a diameter smaller than the diameter of the lower step  910 . 
     As illustrated in the drawing, the lower step  910  may be configured to have a circular shape and a predetermined height, and the upper step  920  having a diameter smaller than the diameter of the lower step  910  may be formed on the upper part of such a lower step  910  by protruding upward therefrom to have a predetermined height. Accordingly, like the upper surface of the main body  500 , a horizontal step surface  902  may be formed between the lower step  910  having the larger diameter and the upper step  920  having the smaller diameter. 
     A lower step ring  912  and an upper step ring  914  having shapes corresponding to the outer surfaces of the lower step  910  and the upper step  920 , respectively, may be provided on the outer surfaces of the lower step  910  and the upper step  920 , respectively. That is, the lower step ring  912  and the upper step ring  914  may be provided on the outer circumferential surfaces of the lower step  910  and the upper step  920 , respectively, which have the outer surfaces of circular shapes, and may cover the outer surfaces (side surfaces) of the lower step  910  and the upper step  920 . 
     The lower step ring  912  and the upper step ring  914  may protect parts thereinside and may function as exterior materials. Accordingly, like the outer handle  304 , the lower step ring  912  and the upper step ring  914  may be made of a material such as stainless steel which has a smooth surface and is resistant to rust. 
     In addition, an elastic member  930  made of an elastic material may be provided on the step surface  902  provided between the upper step  920  and the lower step  910 . As illustrated in the drawing, the elastic member  930  may be configured to cover the step surface  902  formed on the upper surface of the lower step  910 , and to cover the lower half part of the upper step  920 . 
     The elastic member  930  may be made of an elastic material, and thus may function to buffer impact which may be generated when the container body  100  sits on the main body  500 . That is, when the lower surface of the container body  100  sitting on the upper step  920  is in contact with the upper step  920 , the elastic member  930  may function to prevent breakage or noise that may occur due to the collision of the lower surface of the container body  100  with the upper step  920  and the lower step  910  of the main body  500 , which are made of solid materials. 
     Accordingly, the elastic member  930  may be made of a material such as rubber, and may function to make the seating of the container body  100  efficient. Further, the elastic member  930  may be made of a conductive rubber when required, and in this case, the conductive rubber may be provided even on the lower surface of the container body  100 . 
     The power transmission part  700  and the signal reception part  820  may be mounted to the upper surface of the upper step  920 . 
     Particularly, the coil seating part  940  may be formed on the right surface of the upper step  920  by protruding therefrom to the right, and the power transmission part  700  may be mounted to the upper surface of such a coil seating part  940 . 
     The power transmission part  700  may be located to be adjacent to the power reception part  220  provided in the container body  100 , and may function to supply power to the power reception part  220 . Accordingly, such a power transmission part  700  may be configured as an induction coil. That is, like the power reception part  220 , the induction coil may be configured by being wound multiple times on the same plane, such as a PCB, in a spiral shape relative to a transmission center point (not shown). 
     In addition, although not shown in detail, the main body  500  may have an oscillation circuit part therein. Such an oscillation circuit part may generate current and apply the current to the power transmission part  700 . Accordingly, a magnetic field may be formed in the power transmission part  700  by the applied current. Furthermore, the oscillation circuit part may change the intensity of the current applied to the power transmission part  700 , and thus the magnetic field may be changed in the power transmission part  700  by the change of the current intensity. 
     Accordingly, as in the present disclosure, with the power reception part  220  and the power transmission part  700  installed to vertically correspond to each other, as the intensity of current applied to the power transmission part  700  changes, the magnetic field of the power transmission part  700  may be changed, and a magnetic flux passing through the power reception part  220  may be changed due to inductive coupling between the power transmission part  700  and the power reception part  220 , so the induced electromotive force may be generated in the power reception part  220 . Furthermore, such an induced electromotive force may be supplied to the signal transmission part  810 . 
     The signal reception part  820  may be provided at a side opposite to the power transmission part  700 . That is, the signal reception part  820  may be mounted in a receiving groove  822  formed in the left end of the upper surface of the upper step  920 , which is a position vertically corresponding to the signal transmission part  810  mounted to the container body  100 . 
     Particularly, the receiving groove  822  having a predetermined size may be formed in the left end of the upper surface of the upper step  920  by being depressed therefrom, and the signal reception part  820  may be mounted in such a receiving groove  822 . 
     As described above, the signal reception part  820  may include the photosensor. The light reception module  820  may receive light transmitted by the signal transmission part  810 , and transmit a light reception signal. 
     In addition, a Hall sensor  950  and a container body detection switch  960  may be provided on the upper surface of the upper step  920 . That is, a container body switch groove  962  and a sensor groove  952  may be formed in the front end portion and rear end portion of the upper surface of the upper step  920 , respectively, by being depressed therefrom, and the container body detection switch  960  and the Hall sensor  950  may be mounted in the container body switch groove  962  and the sensor groove  952 , respectively. 
     The container body detection switch  960  may be configured as a reed switch, and may detect whether the container body  100  is seated on the upper surface of the main body  500 . When such a container body detection switch  960  is provided, a magnet (not shown) corresponding thereto may be provided on the lower end of the container body  100 . 
     The Hall sensor  950  is intended to determine a type of the container body  100  sitting on the main body  500 , and even in this case, a signal transmission part corresponding thereto may be required on the lower surface of the container body  100 . 
     The upper step ring  914  mounted to the edge of the upper step  920  may be configured to be divided into two parts. That is, as illustrated in  FIG. 6 , the upper step ring  914  may include a protruding piece  916  covering the outer surface of the coil seating part  940  formed on the right surface of the upper step  920  by protruding therefrom to the right, and a curved piece  918  covering the remaining outer surface of the upper step  920 . 
     Meanwhile, the upper part of the upper step  920  may be covered by a cover  970 . Accordingly, the power transmission part  700 , the signal reception part  820 , the container body detection switch  960 , and the Hall sensor  950  mounted to the upper step  920  may be covered and protected by the cover  970 . 
     In addition, the seating step  900  may have a center vertically formed therethrough such that the blade assembly  200  of the container body  100  and the motor assembly  600  provided in the main body  500  may be connected to each other. 
     More particularly, the circular end receiving groove  980  may be formed in the center portion of the upper step  920  by being depressed therefrom, and the circular end  174  of the lower end of the container body  100  described above may be received in such a circular end receiving groove  980 . That is, the upper step  920  may have the shape of a circular ring as a whole, and the circular end receiving groove  980  having a circular shape may be formed in the center portion of such an upper step  920 . 
     At least one protrusion groove  982  may be formed in the inner surface of the upper step  920 . The protrusion groove  982  may be formed by being depressed radially from the circular end receiving groove  980 , and the mounting protrusions  174   a  of the container body  100  may be seated in the protrusion grooves  982 . 
     Accordingly, the protrusion grooves  982  may be configured to have the size and number thereof corresponding to the size and number of the mounting protrusions  174   a , and the size of the width of the protrusion groove  982  may be configured to be the same as or larger than the size of the width of the mounting protrusion  174   a.    
     In  FIGS. 20 to 22 , a configuration of a power transmission part  700  and an example of the arrangement relation of the power transmission part and the coil holder are illustrated. That is,  FIG. 20  is a perspective view of the power transmission part  700  constituting the blender according to the embodiment of the present disclosure, and  FIGS. 21 and 22  are an exploded perspective view and an exploded front view, respectively, illustrating a mutual arrangement relation of the power transmission part  700  and the coil holder  130 . 
     As described above, the power transmission part  700  may be installed on a side of the upper part of the main body  500 . 
     The power transmission part  700  may be embodied with a transmission induction coil  702  patterned on the same plane as a PCB. The transmission induction coil  702  may be wound multiple times on the PCB in a spiral shape relative to a transmission center point  704 . 
     The main body  500  may include the oscillation circuit part (not shown) therein. The oscillation circuit part (not shown) may apply current to the transmission induction coil  702 , and when the current is applied to the transmission induction coil  702 , a magnetic field may be generated in the transmission induction coil  702 . 
     In addition, such an oscillation circuit part (not shown) may be mounted to the power transmission part  700 , and may change the intensity of the current applied to the transmission induction coil  702 , and thus the magnetic field may be changed in the transmission induction coil  702  by the change of the current intensity. 
     The signal transmission part  810  and the signal reception part  820  are preferably located to be adjacent to each other, and as illustrated in  FIG. 2 , when the container body  100  is mounted to the main body  500 , the signal transmission part  810  and the signal reception part  820  may be located at upper and lower positions, respectively, close to each other. 
     When the signal reception part  820  receives the signal of the signal transmission part  810 , the motor assembly  600  may operate. 
     Like the embodiment illustrated in  FIG. 22 , when the container body  100  is seated on the main body  500 , the transmission induction coil  702  of the main body  500  and the reception induction coil  222  of the container body  100  are preferably disposed vertically at a predetermined interval at positions corresponding to each other. 
     Specifically, when the container body  100  is seated on the main body  500 , the transmission induction coil  702  constituting the power transmission part  700  and the reception induction coil  222  constituting the power reception part  220  may be concentric in the same center points  704  and  224 , and may be disposed to be parallel to each other by facing each other. 
     In addition, inductive coupling between the transmission induction coil  702  constituting the power transmission part  700  and the reception induction coil  222  constituting the power reception part  220  may be selectively performed under a specific condition. 
     When the intensity of current applied to the transmission induction coil  702  changes, the magnetic field of the transmission induction coil  702  may be changed, and a magnetic flux passing through the reception induction coil  222  may be changed due to inductive coupling between the transmission induction coil  702  and the reception induction coil  222 , so induced electromotive force may be generated in the reception induction coil  222 . 
     Accordingly, it is preferable that the positions and arrangement of the transmission induction coil  702  and the reception induction coil  222  are determined such that inductive coupling between the transmission induction coil  702  and the reception induction coil  222  is effectively performed. 
     Furthermore, as described above, the signal transmission part  810  configured to transmit a signal to the outside may be provided at the lower part of the container body  100 , and in the embodiment, the signal transmission part  810  is illustrated to be installed on the left end of the lower surface of the coil holder  130 . 
     In addition, it is preferable that the reception induction coil  222  of the coil holder  130  and the signal transmission part  810  are electrically connected to each other, and the signal transmission part  810  may transmit a signal by receiving power from the reception induction coil  222 . 
     The signal transmission part  810  may transmit a signal to the signal reception part  820  provided in the main body  500 . That is, the signal reception part  820  may receive the signal transmitted by the signal transmission part  810 . 
     Accordingly, the signal transmission part  810  and the signal reception part  820  are preferably disposed at positions corresponding to each other such that the transmission and reception of a signal between the signal transmission part  810  and the signal reception part  820  are efficiently performed, and in the embodiment, when the container body  100  is coupled to the main body  500 , the container body  100  and the main body  500  may be located vertically at a predetermined interval. 
     In addition, as described above, in the embodiment of the present disclosure, the signal transmission part  810  may, for example, include a light source which emits light, and the signal reception part  820  may include a light sensor which detects light emitted from the light source. The light source may include an LED light source, and the light sensor may be embodied as a semiconductor device, a photodiode, or a phototransistor, etc. 
     Hereinafter, an operation of the blender of the present disclosure having the above-described configuration will be described with reference to the accompanying drawings. 
     When the container body  100  sits on the main body  500 , the state of  FIG. 1  may be realized, and in this state, the operation of the blender of the present disclosure may start. 
     First, power supply from the outside may be required such that a user operates the blender, and a wireless power supply device having the wireless power module  520  may be used for such power supply. That is, the power supply from the outside may be performed by the induced electromotive force. Of course, the power supply may be performed by wire. 
     The power of the wireless power module  520  may be supplied to parts, in which power is required, such as the motor assembly  600 , the manipulation part  504 , and the power transmission part  700 , and a user may start or stop the operation of the blender by manipulating the manipulation part  504  or the knob  502 . 
     For example, when a user starts crushing food by manipulating the manipulation part  504  or the knob  502 , the motor assembly  600  is required to be operated to rotate the blades of the blade assembly  200 . 
     However, in this case, the detection system may determine whether the container lid  400  is closed, and when the container lid  400  is opened, the motor assembly  600  and the blade assembly  200  may not be operated. 
     Particularly, since the reed switch  234  may be normally open (off), the power reception part  220 , the reed switch  234 , and the signal transmission part  810  may not form a closed circuit in the container body  100 , so that the signal reception part  820  may not receive light. 
     Accordingly, when the signal reception part  820  does not receive light, the power supply to the motor assembly  600  may be cut off by such a signal. 
     In this state, when the container lid  400  is closed, the permanent magnet  232  of the container lid  400  may be located to be adjacent to the reed switch  234 , and the reed switch  234  may be turned on, whereby the power reception part  220 , the reed switch  234 , and the signal transmission part  810  may form a closed circuit, so the signal reception part  820  may receive light transmitted by the signal transmission part  810 . 
     In this case, due to the detection of the closing of the container lid  400 , the motor assembly  600  may start operating by the manipulation of the user, and the food inside the container body  100  may be crushed. Of course, in this case, whether the container body  100  is mounted to the main body  500  may be detected by the container body detection switch  960  prior to the starting of the operation of the motor assembly  600 . 
     In addition, in this case, the operation state of the blender of the present disclosure may be displayed to the outside by the display part  506 , so the user may visually recognize the operation state or time of the blender. 
     Meanwhile, when the container lid  400  is mounted to or removed from the container body  100 , the user may open or close the container lid  400  by grasping the upper half part of the cap  450 . The container lid  400  may be in close contact with and mounted to the upper surface of the container body  100  by a force of pushing the container lid  400  downward by the user. In this case, the gap between the container lid  400  and the container body  100  may be covered by the gasket  402  provided on the outer surface of the container lid  400 . 
     Additionally, the cap  450  mounted to the center portion of the container lid  400  may be removed therefrom by the user, and this may be performed by the user turning the cap  450  while the user grips the upper end of the cap  450  as described above. 
     For example, in order to mount the cap  450  to the container lid  400 , the user may pass the fastening protrusion  478  of the cap  450  through the entrance groove  442  of the container lid  400  to a lower side thereof from an upper side thereof while the user grips the upper end of the cap  450  and may turn the cap  450  clockwise. In this case, the fastening protrusion  478  may be received in the locking groove  444  and the mounting of the cap  450  may be completed and at the same time, the upward removal of the cap  450  may be prevented. 
     In this state, when turning the cap  450  counterclockwise by gripping the upper end of the cap  450 , the fastening protrusion  478  may be moved from the locking groove  444  and be located at the lower side of the entrance groove  442 . In this case, when the user moves the cap  450  upward, the fastening protrusion  478  may pass through the entrance groove  442  to the upper side thereof from the lower side thereof, so the cap  450  may be removed from the container lid  400 . 
     In addition, even when the cap  450  is mounted to the container lid  400 , air may flow to the upper and lower sides of the container lid  400  through the air groove  476 , so the vacuumization of the inside of the container body  100  or the generation of pressure difference between the inside and outside of the container body  100  may be prevented. 
     When the cap  450  is removed from the lid body  410  through the process described above, the user may insert food into the container body  100  through the lid hole  401 , and may stir the food contained inside the container body  100  by using a rod. 
     When the food inside the container body  100  is crushed or mixed by the operation of the motor assembly  600  and the blade assembly  200  and the work according to the intention of the user is completed, the user may raise and remove the container body  100  upward from the main body  500 , open the container lid  400 , and take out the food contained inside the container body  100 . 
     The scope of the present disclosure is not limited to the embodiment illustrated above, and within the technical scope as described above, many other modifications based on the present disclosure will be possible for those skilled in the art. 
     For example, in the embodiment described above, the installation positions of the signal transmission part  810  and the signal reception part  820  are described to be located on the left ends of the container body  100  and the main body  500 , respectively, but the installation positions of the signal transmission part  810  and the signal reception part  820  may be located on the right ends of the container body  100  and the main body  500 , respectively, or on front or rear ends thereof. 
     In addition, in the embodiment described above, one signal reception part  820  is illustrated to be mounted to the main body  500 , but at least two signal reception part  820  may be mounted thereto. The signal reception part  820  may be configured in a ring shape on the upper surface of the upper step  920  to detect whether the container lid  400  is mounted irrespective of the mounting direction of the container body  100 . 
     In addition, a transmission coil constituting the power transmission part  700  may include at least two transmission coils or may be configured in a ring shape on the upper surface of the upper step  920  such that power transmission is not limited to the mounting position of the container body  100 . 
     In addition, the detection system may be configured variously. That is, instead of the signal transmission part  810  and the signal reception part  820 , and the power transmission part  700  and the power reception part  220 , an electrode plate (not shown) may be mounted to each of the container body  100  and the main body  500  so as to determine whether a capacitor is charged and a capacitance is detected, or an Hall IC or a reed switch may be used to detect whether a change of a magnetic field in the power reception part  220  occurs.