KR20210020823A - Manual coffee grinder - Google Patents

Abstract

A manual coffee bean pulverizer comprises: a case; a rotation shaft at least partially inserted into the case in a rotatable state; a handle coupled to the rotation shaft to rotate the rotation shaft; and a burr unit configured to operate in conjunction with the rotation of the rotation shaft to pulverize coffee beans. The case comprises: a gripping groove formed near a lower side of the handle; and a thumb support member provided under the gripping groove. The thumb support member is fastened to the case so that the vertical position can be adjusted.

Description

Manual coffee grinder {Manual coffee grinder}

The present invention relates to a manual coffee bean grinder for grinding coffee beans.

A coffee bean grinder is used to grind roasted coffee beans into sizes suitable for the coffee extraction method and equipment. The degree of grinding of coffee particles is an important factor in the coffee flavor and extraction yield of water-soluble solids because it determines the extraction rate and the surface area in contact with water during extraction. The smaller the pulverized coffee particles, the larger the surface area, the greater the extraction yield of coffee components and the longer the extraction time. Therefore, an brewing device having a short time in contact with water should pulverize the beans into fine particles, and an brewing device having a longer contact time with water preferably increases the size of the ground coffee particles. Therefore, control of the degree of grind is a very important factor for stable coffee extraction.

The hand-operated coffee bean grinder operated by humans does not use a motor, so it does not generate heat that can negatively affect coffee flavor, as well as low noise and can be easily used regardless of location, so it is widely used for home use. . However, the major drawback of the manual coffee bean grinder is that it can be crushed and cut by passing a large amount of smooth and hard beans between the narrow cutting edges of a rotating conical burr by holding the case of the grinder with one hand and turning the handle with the other. Is difficult. Since the case must be crushed while holding the case firmly, the pressing force and rotation speed on the handle change as the number of rotations increases, so that the degree of crushing cannot be kept constant and the crushing time increases. In other words, in a manual coffee bean grinder, it is difficult to rotate the handle with a constant force and rotation speed, so it is difficult to keep the grinding degree and grinding time constant to some extent. Non-uniform grinding and grinding time negatively affect the taste and aroma of the coffee being brewed. This is a fatal disadvantage of a manual coffee bean grinder and a detrimental factor to the quality of the extracted coffee.

In addition, it is configured to adjust the degree of grinding by adjusting the gap between the inner and outer burs that constitute the conical bur, and in the conventional manual grinder, the outer bur is fixed to the case and the inner bur is moved up and down to close the gap. Have a way of controlling. For example, there is a method of adjusting the grinding gap that adjusts the height of the rotating shaft connected to the inner bur through the adjuster connected to the handle at the top. In this case, the member that supports the top of the rotating shaft and rotated for smooth vertical movement of the rotating shaft. Since a sufficient gap between the shafts must be secured, there is a problem in that the flow range of the inner bur that is coupled to the lower end of the rotating shaft increases due to this gap, so that the gap displacement between the inner bur and the outer bur increases. In addition, as another example, there is a method of opening the grinder to adjust the vertical position of the inner burr at the bottom, but this method has the inconvenience of opening the grinder to adjust the position of the inner burr.

In addition, there is a problem in that shaking of the coffee grinder is caused by a momentum generated when the case is held with one hand and the handle is turned with the other hand.

Unexamined Patent Publication No. 10-2017-0050907 (Publication date: May 11, 2017)

The problem to be solved by the present invention is to provide a manual coffee bean grinder capable of operating with a stable force by dispersing the supporting force of the manual coffee bean grinder.

Another problem to be solved by the present invention is to provide a manual coffee bean grinder capable of precisely adjusting the grinding gap through a simple structure.

The manual coffee bean grinder according to an embodiment of the present invention includes a case, a rotating shaft at least partially inserted into the case in a rotatable state, a handle fastened to the rotating shaft so as to rotate the rotating shaft, and the rotating shaft. It includes a burr unit configured to be operated in conjunction with rotation to grind coffee beans. The case includes a gripping groove formed near the lower side of the handle, and a thumb support member provided under the gripping groove. The thumb support member is fastened to the case so that the vertical position can be adjusted.

The thumb support member may have a hemispherical surface shape.

The thumb support member may be fastened to a fastening member fixed to the case through an intermediate member so as to adjust the vertical position.

The thumb support member is movable in the vertical direction together with the intermediate member and can be fastened to the intermediate member by screwing so that the relative position with respect to the intermediate member is variable, and the thumb support member and the intermediate member The intermediate member and the intermediate member and the intermediate member corresponding to the screwed position between the thumb support member and the intermediate member so as to guide the vertical movement of the member and enable the thumb support member and the intermediate member to fix and change the vertical position. It may be configured to selectively adhere to and spaced apart from the thumb support member.

The thumb support member may include a bolt that is fixedly connected. The intermediate member includes a body portion facing the thumb support member, a contact portion disposed to be spaced apart from the body portion, a connection portion connecting the body portion and the contact portion, and a nut configured to be screwed with the bolt It may include. The fastening member may include a guide portion disposed between the body portion and the contact portion and configured to selectively contact the contact portion corresponding to the screwing position of the bolt and the nut.

The nut may be fixed to the body portion, and the bolt may be configured to pass through the nut and be in close contact with the contact portion.

The bur unit is formed to surround the inner burr and the inner burr fastened to the rotational shaft so as to rotate together with the rotational shaft, and has a vertical relative position with respect to the inner burr so that the grinding gap with the inner burr can be adjusted. An external bur configured to be adjustable, and an external bur position adjusting unit for adjusting the vertical position of the external bur may be included.

The external burr position adjusting unit is fastened to the case so as to rotate relative to the case by external manipulation, and an operation member configured to change a vertical relative position with respect to the case by relative rotation with respect to the case, the A support member fastened to the outer burr so as to move in the vertical direction with the outer burr without rotating during rotation and vertical movement of the operation member, and a support member fastened to the support member so as to move in the vertical direction together with the support member 1 lower support member, and a second lower support member supported by the first lower support member so as to move in an up-down direction together with the first lower support member and supporting the operation member from below.

The operation member may include a body portion, and an inner flange extending radially inward from an inner peripheral surface of the body portion, and the support member may include an outer flange supported by the inner flange. A plurality of fastening grooves may be provided on an upper surface of the inner flange, and the outer flange may include a ball plunger selectively fastened to the fastening groove in response to rotation of the operation member.

According to an embodiment of the present invention, the case has a gripping groove disposed adjacent to the bottom of the operating surface of the handle, and the coffee grinder shakes during handle operation by reducing the force moment generated by the distance difference between the handle and the handle. Can be minimized. In addition, since the gripping groove is concave and the seat surface with the support jaw is provided, it is possible to control the shaking caused by the minimized right moment even with a small force. In addition, since the thumb support member is provided, the rotation torque generated by the handle operation can be controlled with a small force that supports the thumb support member without gripping force, and thereby the coffee grinder is rotated in the direction of rotation from the palm It will not slip.

1 is a perspective view of a manual coffee bean grinder according to an embodiment of the present invention.
2 is a partial exploded perspective view showing a thumb support part of the manual coffee bean grinder according to an embodiment of the present invention in an exploded state.
3 is a side view of a manual coffee bean grinder according to an embodiment of the present invention.
4 is a cross-sectional perspective view taken along line IV-IV of a portion indicated by a dotted line in FIG. 3.
5 is a cross-sectional perspective view of a portion indicated by a dotted line in FIG. 3 taken along line V-V.
6 is an exploded perspective view of a manual coffee bean grinder according to an embodiment of the present invention.
7 is a cross-sectional perspective view taken along the line VII-VII.
8 is a bottom exploded perspective view of a case of a manual coffee bean grinder according to an embodiment of the present invention, an external burr position adjusting unit, and an external burr.
9 is a perspective view showing a fastening state of an external bur position control unit and an external bur of the manual coffee bean grinder according to an embodiment of the present invention.
10 is an exploded perspective view of an external bur position adjusting unit and an external bur of a manual coffee bean grinder according to an embodiment of the present invention.
11 is a partial enlarged view showing a state in which the spacing between the inner burr and the outer burr is reduced in FIG. 7.
12 is a partial enlarged view showing a state in which the spacing between the inner burr and the outer burr is enlarged in FIG. 7.
13 is a perspective view showing a case of a manual coffee bean grinder according to an embodiment of the present invention held by a hand for grinding coffee beans.

Hereinafter, a manual coffee bean grinder according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, a manual coffee bean grinder according to an embodiment of the present invention includes a case 10 and a handle 20. As shown in FIG. 3, the case 10 may have an open top, and a lid 30 that is fastened to the case 10 to open and close the opening of the top of the case 10 may be provided. have. The rotating shaft 40 is rotatably installed in the case 10. The rotating shaft 40 may be at least partially inserted into the case 10. The handle 20 is fastened to the rotating shaft 40 so that the rotating shaft 40 can be rotated. That is, when the handle 20 is rotated, the handle 20 and the rotary shaft 40 rotate together about an axis in the longitudinal direction (up and down in FIG. 1) of the rotary shaft 40. With the lid 30 removed, when coffee beans are inserted through the opening at the top of the case 10 and then the handle 20 is rotated, the rotating shaft 40 rotates around the longitudinal axis, thereby causing a conical to be described later. The coffee beans are ground by the action of the conical burr. The ground coffee beans are configured to fall into the collection container 50 disposed under the case 10.

The lid 30 may be fastened by screwing to the rotation shaft 40 so as to press the handle 20 fastened to the rotation shaft 40. For example, a nut 31 inserted at the bottom of the lid 30 may be screwed into a male thread formed in the insertion portion 47 at the top of the rotation shaft 40, and at this time, the lid 30 is a rotation shaft ( It may be configured to be screwed to the rotating shaft 40 while pressing the handle 20 fastened to 40). Specifically, referring to FIGS. 6 and 7, a male thread may be formed in the insertion portion 47 of the upper portion of the locking projection 46 of the rotation shaft 40 and the insertion portion 47 of the rotation shaft 40 Is inserted into the insertion hole 21 formed at the end of the handle 20 so that the locking protrusion 46 of the rotation shaft 40 supports the lower surface of the handle 20, and the lid 30 as shown in FIG. 7 The nut 31 inserted and fixed on the lower surface of the handle presses the upper surface of the handle 20 while being screwed into the male thread of the rotating shaft 40. Thereby, the lid 30 functions not only to cover the upper end of the case 10 but also serves to fix the handle 20 to the rotating shaft 40 so that the handle 20 does not shake or deviate when the handle 20 is turned.

6 and 7, a shaft support 11 for supporting an upper portion of the rotating shaft 40 is provided on an upper end of the case 10. The shaft support 11 is provided with a through hole 111 penetrating in the longitudinal direction, and the rotating shaft 40 is installed to pass through the through hole 111. The locking projection 46 provided on the upper portion of the rotating shaft 40 described above is supported on the shaft support 11. The rotation shaft 40 may be formed to have a circular cross section, and the through hole 111 may be formed slightly larger than the diameter of the rotation shaft 40 to ensure smooth rotation of the rotation shaft 40. At this time, the shaft support 11 may be connected to the inner surface of the case 10 through a plurality of connection legs 12 so that an empty space is formed around the shaft support 11 so that the coffee beans to be input may fall down. .

1, 2, 3, 7 and 13, the case 10 may have a gripping groove 121 positioned adjacent to the bottom of the operating surface of the handle 20. As shown in FIGS. 3 and 13, the gripping groove 121 may have a concave shape that is recessed radially inward from just below the upper end of the case 10. A support jaw 122 may be provided under the gripping groove 121. As shown in FIG. 3, the support jaws 122 may be formed to be inclined radially outward. As shown in Figure 13, the user can wrap the thumb and index finger in a state in which the gripping groove 121 is put into the gripping groove 121 and hold the case 10, and at this time, the lower surface of the thumb and index finger is on the support chin 122 It is supported so that an upward support force can be created on the thumb and index finger. Accordingly, the user can firmly hold the case 10 when turning the handle 20 for grinding coffee beans. At this time, the gripping groove 121 is disposed adjacent to the operating surface of the handle 20, thereby reducing the moment of force generated by the distance between the handle 20 and the gripping groove 121, whereby the handle (20) Shaking of the coffee grinder during operation can be minimized. Further, it is possible to control the shaking caused by the minimized right moment by the concave gripping groove 121 and the support jaw 122 disposed below it with a small force.

As shown in Figures 1 to 3, the thumb support member 90 is fastened to the case 10. As shown in FIG. 13, the lower surface of the thumb is supported by the thumb support member 90 in a state in which the user puts the thumb and the index finger into the gripping groove 121 and grips the case 10.

The thumb support member 90 may have a convex curved surface, for example, a substantially hemisphere-shaped surface shape, and may be installed immediately below the gripping groove 121. According to an embodiment of the present invention, the thumb support member 90 may be fastened to the case 10 so as to be able to adjust its vertical position so that it can be fixed to a desired vertical position. Since the up-down position of the thumb support member 90 can be adjusted, the user adjusts the up-down position of the thumb support member 90 so that the thumb support member 90 is fixed in a vertical position suitable for the user. By doing so, the case 10 can be firmly gripped. In particular, the rotation torque generated by the manipulation of the handle 20 is not supported by a grip force, and as shown in FIG. 13, the bottom surface of the thumb can be controlled by a small force supporting the thumb support member 90.

The thumb support member 90 may be fastened to the fastening member 107 integrally protruding from the case 10 via the mediating member 101 so as to be able to adjust the position in the vertical direction. The thumb support member 90 and the intermediate member 101 are fastened to each other by screwing, and corresponding to the screwing position between the thumb support member 90 and the intermediate member 101, the intermediate member 101 and the thumb The finger support member 90 and the fastening member 107 are configured to selectively adhere and space apart. When the intermediate member 101 and the thumb support member 90 and the fastening member 107 are in close contact, the upper and lower positions of the thumb support member 90 and the intermediate member 101 are fixed, and the intermediate member 101 and When the thumb support member 90 and the fastening member 107 are spaced apart, the position of the thumb support member 90 and the intermediate member 101 in the vertical direction may be changed. With this structure, the thumb support member 90 may be fixed in a desired vertical position.

Referring to Figure 4, the thumb support member 90 includes a bolt 92 that is fixedly connected. The thumb support member 90 having a hemispherical surface shape forms a recessed space 91 that is open to face the case 10, and the bolt 92 protrudes into the recessed space 91 to support the thumb. It may be integrally inserted into the member 90. Referring to Figure 4, the intermediate member 101 is a body portion 106 facing the thumb support member 90, a contact portion 105 disposed in a state spaced apart from the body portion 106 in the transverse direction, and the body It may include a connection portion 104 connecting the portion 106 and the contact portion 105. The body part 106 may be provided with a nut 103 that is screwed with the bolt 92 of the thumb support member 90. The nut 103 may be inserted to be fixed to the body part 106. The fastening member 107 may include a guide portion 1072 disposed between the body portion 106 and the contact portion 105, and a connection portion 1071 connecting the guide portion 1072 and the case 10. The fastening member 107 may be integrally formed to form a part of the case 10. The bolt 92 is configured to be in close contact with the contact portion 105 through the nut 103. The contact portion 105 of the intermediate member 101 and the bolt 92 of the thumb support member 90 correspond to the screwing position of the bolt 92 and the nut 103, and the guide portion 1072 of the fastening member 107 ) Is configured to selectively contact. Figure 4 (a) shows a screwed position to make the contact portion 105 and the bolt 92 contact both sides of the guide portion 1072, respectively, and Figure 4 (b) shows the contact portion 105 and the bolt A screwed position is shown to make 92 spaced apart from both sides of the guide portion 1072. That is, in the screwing position of FIG. 4 (a), the distance between the front end of the bolt 92 and the surface of the contact portion 105 facing is the same as the thickness of the guide portion 1072, whereby the thumb support member 90 ) Is created in a state in which it cannot move up and down. On the other hand, in the screwing position of FIG. 4(b), the distance between the front end of the bolt 92 and the surface of the contacting portion 105 is greater than the thickness of the guide portion 1072, and the thumb support member 90 A state that can be moved up and down is created. When coffee beans are ground in the state of Fig. 4(a) and position adjustment is necessary, the thumb support member 90 is rotated around its longitudinal (transverse direction in Fig. 4) axis, and Fig. 4(b) After making the state of, the position of the thumb support member 90 can be adjusted. 5 is a view for explaining the position adjustment process of such a thumb support member 90. First, Fig. 5 (a) shows a state in which the thumb support member 90 is fixed at the highest vertical position, and Fig. 5 (b) shows a guide by rotating the thumb support member 90 at the corresponding position. A state in which the portion 1072 and the contact portion 105 and the bolt 92 are spaced apart is shown. In the state of Figure 5 (b), the thumb support member 90 can be moved downward to move to the vertical position shown in Figure 5 (c), and then the thumb support member 90 is again By turning in the opposite direction, the guide portion 1072, the contact portion 105, and the bolt 92 shown in FIG. 5(d) may be in close contact with each other to be in a fixed state.

The manual coffee bean grinder according to an embodiment of the present invention includes a burr unit 70 for grinding coffee beans. The bur unit 70 operates in conjunction with the rotation of the rotating shaft 40. The bur unit 70 may include an inner bur 71 and an outer bur 72, and although not specified in the drawing, the crushing surfaces 711 and 721 facing the inner bur 71 and the outer bur 72 A grinding blade may be formed respectively. For example, the bur unit 70 may be formed of a conical burr in which the crushed surfaces 711 and 721 of the inner bur 71 and the outer bur 72 have a cone shape. Referring to FIGS. 3 and 4, the inner bur 71 may have a cone shape in which through holes are formed vertically as a whole, and may be formed so that the crushing surface 711 is exposed to the outside. In addition, referring to FIGS. 6 and 7, the outer bur 72 may have a cylindrical shape in which through holes are formed vertically as a whole, and the grinding surface 721 may be formed under the inner surface forming the through holes. The crushing surface 711 of the inner burr 71 and the crushing surface 721 of the external burr 72 are disposed to face each other while being slightly spaced apart. The manual coffee bean grinder according to an embodiment of the present invention is formed so that the distance between the grinding surface 711 of the inner burr 71 and the grinding surface 721 of the outer burr 72, that is, the grinding gap can be adjusted. Specifically, the vertical position of the inner bur 71 (up and down in Fig. 7) is fixed and the vertical position of the outer bur 72 is variable, so that the longitudinal position of the outer bur 72 is changed. It is configured such that the grinding gap is adjusted by.

The inner bur 71 is fastened to the rotating shaft 40 so as to rotate together with the rotating shaft 40. At this time, as described above, the vertical position of the inner bur 71 is fixed. For example, as shown in FIG. 4, the inner bur 71 is fastened to the lower end of the rotating shaft 40, and the inner bur 71 rotates with the rotating shaft 40 so that the rotating shaft 40 The flat surface 41 is formed at the bottom of the inner burr 71 and the through hole of the inner burr 71 also has a shape corresponding thereto, so that the inner burr 71 rotates together with the rotation shaft 40 and is fastened to each other. At this time, upper and lower fixing members 43 and 44 are respectively provided above and below the inner bur 71 in order to fix the longitudinal position of the inner bur 71. The upper fixing member 43 is installed so that its upper end is supported by the locking protrusion 42 provided on the rotating shaft 40 to block the upward movement, and the inner bur 71 is at the lower end of the upper fixing member 43 The rotation shaft 40 is fitted in the through hole 712 so as to be in close contact. The lower fixing member 44 is fastened to the rotating shaft 40 to support the lower end of the inner bur 71. At this time, although not specified in the drawings, the lower fixing member 44 may be a nut having a female thread and may be screwed to a male thread formed at the lower end of the rotating shaft 40 through screw coupling. The inner bur 71 is fastened to the lower end of the rotating shaft 40 by this fastening structure, so that the inner bur 71 can rotate together with the rotating shaft 40 in a state where the vertical position is fixed.

The outer burr 72 is formed to surround the inner burr 71. For example, as shown in FIG. 7, the inner burr 71 may be disposed in the through hole 722 of the outer burr 72 in the vertical direction.

Burr unit 70 according to an embodiment of the present invention includes an external burr position control structure 8 for adjusting the vertical position of the external burr 72. The outer burr position adjustment structure 8 can adjust the distance between the grinding surface 711 of the inner burr 71 and the grinding surface 721 of the outer burr 72 by adjusting the vertical position of the outer burr 72. have. The external burr position adjusting structure 8 may include an operation member 81 and a support member 83.

The operating member 81 is fastened to the case 10 so as to be able to rotate relative to the case 10 by external manipulation. At this time, the operation member 81 is configured such that a vertical relative position with respect to the case 10 is changed by a relative rotation with respect to the case 10. When the vertical relative position of the operating member 81 with respect to the case 10 is changed, the vertical relative position of the operating member 81 with respect to the inner bur 71 fixed at a predetermined vertical position in the case 10 Also changes. For example, the operation member 81 may include a ring-shaped body portion 811 extending in the vertical direction, and an inner flange 812 extending inward from an inner peripheral surface of the body portion 811. As shown in FIG. 11, a screw thread 813 which is screwed with a thread 14 formed at a lower end of the outer surface of the case 10 may be provided at an upper end of the inner surface of the body portion 811. When the user turns the operation member 81, screw rotation is performed, thereby adjusting the vertical relative position of the operation member 81 with respect to the case 10.

The support member 83 is supported on the outer bur 72 so as to move in the vertical direction together with the outer bur 72 on the one hand, and supports the outer bur 72 on the other hand. That is, the outer burr 72 is supported by the support member 83 so as to move in the vertical direction together with the support member 83. For example, referring to Figures 6 to 12, the support member 83 is a cylindrical body portion 831 extending in the vertical direction, and an outer flange 832 extending outward from the outer peripheral surface of the body portion 831 It can be provided. As shown in the figure, a vertical movement guide portion 833 for securing the vertical movement of the support member 83 may be provided, and the vertical movement guide portion 833 is a rotation shaft 40 through which It may be provided with a vertical through hole (8331). As shown in FIG. 9, the vertical movement guide part 833 may be connected to the body part 831 through a plurality of connection legs 831.

Referring to FIG. 8, a fastening protrusion 836 for fastening with an external bur 72 is provided on the lower inner surface of the cylindrical body portion 831 of the support member 83. The fastening protrusions 836 may be provided in plural, and may be disposed at equal intervals along the circumferential direction under the inner surface of the body portion 831. On the other hand, the outer bur 72 includes a fastening space 723 into which the fastening protrusion 836 can be inserted and fixed. The fastening space 723 may be formed in the form of a recessed space on the outer surface of the outer burr 72, the insertion space 7231 extending downward from the top of the outer surface of the outer burr 72, and the insertion hole 7231 It may include a receiving space (7232) extending in the circumferential direction of the outer burr (72) from the bottom. After the fastening protrusion 836 of the support member 83 is inserted into the insertion space 7231 in the downward direction, when the support member 83 is rotated, the fastening protrusion 836 moves into the accommodation space 7232. When the fastening protrusion 836 of the support member 83 is accommodated in the receiving space 7232 of the outer burr 72, the support member 83 supports the outer burr 72 in an upward direction, and accordingly, the support member 83 And the external burr 72 move together in the vertical direction. As shown in FIG. 8, three fastening spaces 723 may be provided, and three fastening protrusions 836 of the support member 83 may be provided correspondingly thereto.

Meanwhile, first and second lower support members 84 and 85 for supporting the operation member 81 are provided under the operation member 81. The first lower support member 84 may have a ring shape, and is provided on the lower outer circumferential surface of the body portion 831 of the support member 83 through a thread 841 provided on the inner circumferential surface as shown in FIG. 11. It can be screwed to the thread (8312). Accordingly, the first lower support member 84 moves vertically together with the support member 83. The second lower support member 85 is supported by the first lower support member 84 and supports the operation member 81. The second lower support member 85 includes a support portion 852 extending in the vertical direction, a flange 851 extending radially inward from the lower end of the support portion 852, and a connection portion extending downward from the lower end of the flange 851 ( 853). The lower surface of the flange 851 is supported by the first lower support member 84, and the upper surface of the flange 851 is supported by the support jaws 837 provided on the support member 83. Thereby, the operation member 81 is supported by the first lower support member 84 fixed to the support member 83, and the second lower support member 85 supported by the first lower support member 84 With this structure, the operation member 81, the support member 83, the first lower support member 84 and the second lower support member 85 move together in the vertical direction. May be screwed to a thread 8531 provided on the outer circumferential surface of the connecting portion 853 of the second lower support member 85 by a thread 501 provided on the inner circumferential surface of the upper end thereof. The collection container 50 can be separated by releasing the coupling. On the other hand, as shown in Fig. 10, the second lower support member 85 is a fastening protrusion protruding radially inward from the inner end of the flange 851. The 854 may be provided, and the fastening protrusion 854 is disposed in the fastening space 723 of the outer burr 72.

On the other hand, the support member 83 is configured to move vertically in a state in which rotation is blocked. To this end, referring to FIGS. 8 to 10, a fastening protrusion 161 extending in the vertical direction on the outer circumferential surface of the connection part 16 provided inside the case 10 is the body part 831 of the support member 83 It is inserted to be movable in the vertical direction into the fastening groove 8311 extending in the vertical direction on the inner peripheral surface of the. At this time, the width of the fastening groove 8311 is made to be finely larger than the width of the fastening protrusion 161 so that rotation in the circumferential direction is blocked and the vertical movement is possible.

By the structure as described above, the operation member 81 undergoes vertical movement when rotating, and the support member 83 and the external burr 72 supported thereon by the rotation and vertical movement of the operation member 81 It undergoes vertical movement along with. The grinding gap, which is the distance between the outer burr 72 and the inner burr 71, may be adjusted by the vertical movement of the outer burr 72.

For example, FIG. 11 shows a state in which the pulverization gap, which is the gap between the crushing surface 711 of the inner burr 71 and the crushing surface 721 of the outer burr 72, is the size of'G1'. 12 shows a state in which the operation member 81, the support member 83, and the outer burr 72 are moved upward in the state of FIG. 11 and the grinding gap is increased to'G2'. In this way, it is possible to adjust the grinding gap by rotating the operation member 81 from the outside to create a desired grinding gap. In particular, the grinding gap is adjusted by moving the external bur 72 rather than adjusting the grinding gap by moving the inner bur 71 Because it takes a method of reducing the free space of the part supporting the upper end of the rotating shaft 40, the lateral clearance of the internal bur 71 fastened to the lower end of the rotating shaft 40 is reduced, resulting in precise and more consistent grinding. A gap can be made. This makes it possible to make coffee powder with a uniform taste and flavor.

On the other hand, according to another embodiment of the present invention, a means for informing the rotation position of the operation member 81, that is, the crushing gap may be provided. For example, a ball plunger 835 may be provided on the lower surface of the outer flange 832 of the support member 83. Referring to FIG. 7, the ball plunger 835 may include a ball 8351 and a spring 8352 for elastically supporting it, and a case 8321 in which the ball plunger 835 is supported by the outer flange 832 ) Can be placed within. And, as shown in FIG. 10, a plurality of grooves 814 are formed on the upper surface of the inner plunge 812 of the operation member 81, and the ball 8351 of the ball plunger 835 when the operation member 81 rotates. When) reaches the groove 814, the ball 8351 is pushed to the outside by the elastic restoring force of the spring 8352 and is partially inserted into the groove 814. In this process, a clicking sound is generated, and thereby, the rotation of the operation member 81 can be confirmed through sensation and hearing transmitted to the user's hand. Thereby, it can be recognized that the operation member 81 is located in a specific rotational position, that is, a specific grinding gap. As shown in FIG. 10, the plurality of grooves 814 may be disposed at equal intervals along the circumferential direction on the upper surface of the inner flange 812 of the operation member 81.

On the other hand, in another embodiment of the present invention, it may be configured to be able to check the rotation of the operation member 81 through visual observation. For example, as shown in FIG. 1, a plurality of rotation marks 818 indicating rotational positions may be displayed on the outer circumferential surface of the operation member 81. The rotation position of the operation member 81 can be visually recognized through the relative position of the rotation mark 818 and the reference mark displayed on the case 10.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

10: case
13: finger support
20: handle
30: lid
40: rotating shaft
50: collection bin
70: Burr unit
71: internal burr
711: crushed surface
72: external burr
721: crushed surface
8: external burr positioning unit
81: operation member
83: support member
84: first lower support member
85: second lower support member

Claims (6)

case,
A rotating shaft at least partially inserted into the case in a rotatable state,
A handle fastened to the rotating shaft to rotate the rotating shaft, and
It includes a burr unit configured to pulverize coffee beans by operating in conjunction with the rotation of the rotating shaft,
The case is
A gripping groove formed near the lower side of the handle, and
Thumb support member provided under the gripping groove
Including,
The thumb support member is fastened to the case so that the vertical position can be adjusted
Manual coffee bean grinder. In claim 1,
The thumb support member is a manual coffee bean grinder having a hemispherical surface shape. In claim 1,
The thumb support member is a manual coffee bean grinder that is fastened to a fastening member fixed to the case through an intermediate member so as to adjust the vertical position. In paragraph 3,
The thumb support member is fastened to the intermediate member by screwing so that the thumb support member is movable in a vertical direction with the intermediate member and a relative position with respect to the intermediate member is variable,
A screwed position between the thumb support member and the intermediate member to guide the vertical movement of the thumb support member and the intermediate member, and fix and change the thumb support member and the intermediate member in the vertical direction In response to the intermediate member and the thumb support member is configured to be selectively adhered and spaced apart
Manual coffee bean grinder. In claim 4,
The thumb support member includes a bolt that is fixedly connected,
The intermediate member
A body portion facing the thumb support member,
A contact portion disposed to be spaced apart from the body portion,
A connection part connecting the body part and the contact part, and
Nut configured to be screwed to the bolt
Including,
The fastening member includes a guide portion disposed between the body portion and the contact portion and configured to selectively contact the contact portion corresponding to the screwing position of the bolt and the nut.
Manual coffee bean grinder. In clause 5,
The nut is fixed to the body portion,
The bolt is configured to be in close contact with the contact portion through the nut
Manual coffee bean grinder.

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