A hand-operated coffee grinder

Abstract

The utility model discloses a hand -operated coffee grinder, including from top to bottom handle, rotating cover, pivot, store bean storehouse, grinding assembly and powder storage tank are arranged in proper order, and rotating cover is detachably covered in the top opening of store bean storehouse, and the inside of store bean storehouse is rotatably equipped with pivot, and the bottom of pivot is transmission connection with grinding assembly, and one end of handle can be inserted into the inside of rotating cover with rotating cover detachable connection from the side of rotating cover, and the top of pivot can be inserted into the inside of rotating cover with rotating cover detachable connection from the bottom surface of rotating cover, and handle and pivot buckle connection in the inside of rotating cover. The utility model discloses through systematic innovation, on the basis of keeping the core advantage of hand -operated grinder, handle detachable with rotating cover and pivot is connected, realizes the grinder portability, functional, reliability triple breakthrough, especially suitable for the modern kitchen of space limited, precision camping equipment and mobile coffee service etc.

Description

Technical Field

[0001] This utility model relates to the field of coffee grinder technology, and in particular to a hand-cranked coffee grinder. Background Technology

[0002] Hand-cranked coffee grinders, as small grinding appliances, are widely used in various scenarios such as home kitchens, outdoor camping, and mobile cafes due to their portability and lack of electricity. Traditional hand-cranked grinders typically use a fixed handle structure, with the handle assembly including a rotating grip and an extension arm coaxially connected to the grinding shaft. While this structure achieves torque transmission, it also results in significant space occupation during storage.

[0003] In home kitchen applications, the L-shaped handles of mainstream products typically protrude 8-15cm from the outer edge of the body, making it impossible to stack them flat when stored in drawers. For outdoor travel and mobile catering equipment, protruding handles are prone to snagging on other items in backpacks, causing deformation of the handle's hinge or damage to the locking mechanism.

[0004] While existing technologies offer improvements such as detachable handles, like Chinese patent CN221153858U which uses a hinge structure for partial storage optimization, practical applications have revealed stress concentration at the folding joints. The maximum deformation during grinding operations can affect transmission stability. Therefore, there is an urgent need to develop a novel handle structure that optimizes the spatial integration of the handle assembly and the grinder body while ensuring torque transmission efficiency and operational comfort. Utility Model Content

[0005] In response to the problems raised in the background art, the purpose of this utility model is to propose a hand-cranked coffee grinder that solves the problem of poor transmission stability caused by the folding of the handle assembly of existing coffee grinders through a hinge structure.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A hand-cranked coffee grinder includes a handle, a rotating cover, a rotating shaft, a bean storage hopper, a grinding assembly, and a powder storage tank. The rotating cover, bean storage hopper, grinding assembly, and powder storage tank are arranged sequentially from top to bottom. The rotating cover is detachably installed over the top opening of the bean storage hopper. The rotating shaft is rotatably installed inside the bean storage hopper, and the bottom end of the rotating shaft is connected to the grinding assembly.

[0008] One end of the handle can be inserted into the interior of the rotating cover from one side and detachably connected to the rotating cover. The top end of the rotating shaft can be inserted into the interior of the rotating cover from the bottom surface and detachably connected to the rotating cover. The handle and the rotating shaft are snap-fitted together inside the rotating cover.

[0009] Preferably, the bottom of the rotating cover is provided with a pivot cavity, which extends vertically through the rotating cover. When the pivot is connected to the rotating cover, the top end of the pivot is inserted into the notch of the handle through the pivot cavity.

[0010] Preferably, the rotating cover is further provided with a handle mounting cavity, which extends horizontally. One end of the handle mounting cavity penetrates the side wall of the rotating cover to form a handle mounting hole. The rotating shaft cavity communicates with the handle mounting cavity. When the handle is inserted into the handle mounting cavity through the handle mounting hole, the notch is located at the intersection of the rotating shaft cavity and the handle mounting cavity.

[0011] Preferably, the outer side of the bean storage bin is provided with a handle storage cavity, which extends along the height direction of the bean storage bin and is used to store the handle.

[0012] Preferably, the handle includes a rod and a handle portion, the handle portion is mounted on one end of the rod portion, the rod portion and the handle portion are in the shape of a "7", and the other end of the rod portion is provided with the notch.

[0013] Preferably, the rod is detachably mounted in the handle storage cavity, and when the rod is located in the handle storage cavity, the handle abuts against the top surface of the rotating cover.

[0014] Preferably, the interior of the bean storage bin is provided with a shaft cavity, which extends vertically and is connected to the inner wall of the bean storage bin by a number of connecting ribs. The rotating shaft is installed in the shaft cavity, and the top and bottom of the rotating shaft protrude from the shaft cavity.

[0015] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0016] This utility model, through systematic innovation, maintains the core advantages of hand-cranked grinders while detachably connecting the handle to the rotating cover and shaft, achieving a triple breakthrough in the grinder's portability, functionality, and reliability. It is particularly suitable for scenarios such as modern kitchens with limited space, precision camping equipment, and mobile coffee services, marking the evolution of portable coffee grinding equipment towards integration and specialization. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention in the handle usage state;

[0018] Figure 2 This is a schematic diagram of the structure of one embodiment of the present invention in the handle storage state;

[0019] Figure 3 yes Figure 1 Exploded view;

[0020] Figure 4 yes Figure 3 Front view;

[0021] Figure 5 yes Figure 4 Sectional view at point AA;

[0022] Figure 6 yes Figure 1 Front view;

[0023] Figure 7 yes Figure 6 Sectional view at point BB;

[0024] Figure 8 yes Figure 6 Sectional view at point CC.

[0025] The components include: handle 1, rod 11, handle part 12, notch 101, rotating cover 2, shaft cavity 21, handle mounting cavity 22, handle mounting hole 221, shaft 3, locking block 31, bean storage bin 4, top opening 41, handle storage cavity 42, shaft cavity 43, connecting rib 44, grinding assembly 5, and powder storage tank 6. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0029] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The following is in conjunction with the appendix Figures 1 to 8 The technical solution of this utility model will be further illustrated through specific implementation methods.

[0031] A hand-cranked coffee grinder includes a handle 1, a rotating cover 2, a rotating shaft 3, a bean storage hopper 4, a grinding assembly 5, and a powder storage tank 6. The rotating cover 2, the bean storage hopper 4, the grinding assembly 5, and the powder storage tank 6 are arranged sequentially from top to bottom. The rotating cover 2 is detachably installed on the top opening 41 of the bean storage hopper 4. The rotating shaft 3 is rotatably installed inside the bean storage hopper 4, and the bottom end of the rotating shaft 3 is connected to the grinding assembly 5.

[0032] One end of the handle 1 can be inserted into the interior of the rotating cover 2 from one side and detachably connected to the rotating cover 2. The top end of the rotating shaft 3 can be inserted into the interior of the rotating cover 2 from the bottom surface and detachably connected to the rotating cover 2. The handle 1 and the rotating shaft 3 are snap-fitted together inside the rotating cover 2.

[0033] This invention provides a hand-cranked coffee grinder with a detachable handle 1 connected to the main body. This ensures that the handle does not protrude from the main body when the grinder is not in use, and is reattached to the main body when the grinder is in use. This design significantly reduces the storage space occupied by the grinder compared to traditional grinders with non-detachable handles, thus optimizing storage space and improving portability.

[0034] Specifically, when grinding beans, the rotating cover 2 is removed from the top opening 41 of the bean storage chamber 4. One end of the handle 1 is inserted into the inside of the rotating cover 2 to complete the first assembly step. Then, the top end of the rotating shaft 3, located inside the bean storage chamber 4, is inserted into the inside of the rotating cover 2 from the bottom surface and snapped into place with the handle 1 already installed on the rotating cover 2. At this point, the rotating cover 2 is reattached to the top opening 41. After assembly, the grinder drives the rotating shaft 3 by holding the other end of the handle 1 located on the outside of the machine body, which in turn drives the grinding component 5 to rotate and grind the beans in the bean storage chamber 4. The ground powder falls into the powder storage tank 6 at the bottom. The above solution, which assembles the rotating cover 2 and handle 1 before connecting them to the rotating shaft 3, eliminates stress concentration points at the hinge joints compared to traditional folding handles, thus solving the problem of poor grinding stability. Through systematic innovation, this utility model, while maintaining the core advantages of hand-cranked grinders, detachably connects the handle 1 to the rotating cover 2 and the rotating shaft 3, achieving a triple breakthrough in the portability, functionality, and reliability of the grinder. It is particularly suitable for scenarios such as modern kitchens with limited space, precision camping equipment, and mobile coffee services, marking the evolution of portable coffee grinding equipment towards integration and specialization.

[0035] Furthermore, the bottom of the rotating cover 2 is provided with a rotating shaft cavity 21, which penetrates the rotating cover 2 vertically. When the rotating shaft 3 is connected to the rotating cover 2, the top end of the rotating shaft 3 is inserted into the notch 101 of the handle through the rotating shaft cavity 21.

[0036] The interaction between the top of the shaft 3 and the notch 101 forms a two-way constraint between the radial direction of the handle 1 and the axial direction of the shaft 3, which improves the torsional strength and helps to eliminate the risk of slippage between the handle and the shaft during the grinding process.

[0037] Furthermore, the notch 101 can be formed on the side wall of the handle 1, or it can be a through hole penetrating the thickness of the handle 1. Preferably, the notch 101 is designed with a wedge-shaped interlocking structure, and a locking block 31 matching the shape of the notch 101 can be provided at the top of the rotating shaft 3, so as to increase the contact area between the rotating shaft 3 and the handle 1 and effectively avoid the problem of loosening of the connection after long-term use.

[0038] Furthermore, the rotating cover 2 is also provided with a handle mounting cavity 22, which extends horizontally. One end of the handle mounting cavity 22 penetrates the side wall of the rotating cover 2 to form a handle mounting hole 221. The rotating shaft cavity 21 communicates with the handle mounting cavity 22. When the handle 1 is inserted into the handle mounting cavity 22 through the handle mounting hole 221, the notch 101 is located at the intersection of the rotating shaft cavity 21 and the handle mounting cavity 22.

[0039] The rotating cover 2 includes a rotating shaft cavity 21 and a handle mounting cavity 22. After the handle 1 is installed in the handle mounting cavity 22, the notch 101 of the handle 1 is located at the intersection of the two cavities of the rotating shaft cavity 21 and the handle mounting cavity 22, forming a surrounding structure suitable for installation on the top of the rotating shaft 3, making the transmission connection between the handle 1 and the rotating shaft 3 more stable.

[0040] To further explain, the rotating shaft cavity 21 extends vertically through the rotating cover 2, forming a through hole in the top wall of the rotating cover 2. This through hole provides for observation and calibration, specifically providing intuitive feedback during the process of the rotating shaft 3 being installed from the bottom of the rotating shaft cavity 21 onto the notch 101 of the handle.

[0041] The rotating cover 2 integrates the pivot cavity 21 and the handle mounting cavity 22, consolidating the assembly relationship of the traditionally separate transmission components within the rotating cover 2. This reduces the number of parts, simplifies the assembly process, and significantly improves production efficiency and product reliability.

[0042] Furthermore, the outer side of the bean storage bin 4 is provided with a handle storage cavity 42, which extends along the height direction of the bean storage bin 4 and is used to store the handle 1.

[0043] The outer side of the bean storage compartment 4 is provided with a handle storage cavity 42 for storing the handle, so that the handle 1 can be stored together with the machine body after being disassembled from the rotating shaft 3 and the rotating cover 2. At the same time, the handle storage cavity 42 extends along the height direction of the bean storage compartment 4, so that the space occupied by the handle 1, which has a certain length, is adjusted from the horizontal direction when in use to the vertical direction with the same height as the machine body. This helps to reduce the space occupied when storing the grinder, while the handle 1 can always follow the grinder body and prevent the handle 1 from being lost.

[0044] To further explain, the handle storage cavity 42 extends along the height direction of the bean storage bin 4, so that the handle storage cavity 42 can accommodate and cover a wider area of ​​the handle 1, making the handle 1 more stable in the stored state and less likely to fall out of the storage cavity. Preferably, the handle storage cavity 42 and the bean storage bin 4 are integrally formed.

[0045] Furthermore, the handle 1 includes a rod portion 11 and a handle portion 12, the handle portion 12 is installed at one end of the rod portion 11, the rod portion 11 and the handle portion 12 are in the shape of a "7", and the other end of the rod portion 11 is provided with the notch 101.

[0046] The 7-shaped structure forms a golden force application angle of 90°-120°. Compared with the traditional straight handle structure, the 12 setting of the handle can improve the user's operating experience. On the one hand, it is more convenient to hold, and on the other hand, it is more efficient to apply force and grind.

[0047] Furthermore, the handle 12 is rotatably mounted on one end of the rod 11, which makes the handle 12 more adaptable during the grinding process by rotating the rod 11 while holding the handle 12.

[0048] Furthermore, the surface of the handle 12 is provided with a finger groove structure to increase the coefficient of friction between the hand and the handle 12 and reduce the risk of accidents.

[0049] Furthermore, the rod portion 11 is detachably installed in the handle storage cavity 42. When the rod portion 11 is located in the handle storage cavity 42, the handle portion 12 abuts against the top surface of the rotating cover 2.

[0050] The 7-shaped structure allows the handle 11 to be stored in the handle storage cavity 42 on the outer wall of the bean storage chamber 4, with the handle 12 resting against the top surface of the rotating cover 2. This is equivalent to the handle 11 being stored against the outer wall of the bean storage chamber 4, and the handle 12 being stacked and stored along the vertical direction of the grinder body. This reduces the overall storage volume of the machine to 60% of that of traditional models. Disassembly is simple; the handle 11 can be removed by holding the handle 12 with one hand, making the process easy and improving operational efficiency.

[0051] When the handle 1 is folded up, the outer contour of the rotating cover 2 and the bean storage compartment 4 form a continuous cylinder. With the vertically extended handle storage cavity 42, the overall storage height of the machine only increases by the height / width of the handle 12. The horizontal dimensions are comparable to traditional models, achieving "zero space waste" in the horizontal direction.

[0052] Furthermore, the interior of the bean storage bin 4 is provided with a shaft cavity 43, which extends vertically and is connected to the inner wall of the bean storage bin 4 by a number of connecting ribs 44. The rotating shaft 3 is installed in the shaft cavity 43, and the top and bottom of the rotating shaft 3 protrude from the shaft cavity 43.

[0053] The shaft cavity 43 adopts a three-dimensional positioning architecture, which forms a full circumferential constraint with the rotating shaft 3 through a vertically extending cylindrical structure. Compared with the traditional cantilever beam rotating shaft structure, the structural bending stiffness of this solution is improved, the shaft deflection is reduced during grinding operations, and the stability is improved.

[0054] Preferably, the outer diameter of the shaft cavity 43 accounts for 35% of the inner diameter of the bean storage chamber 4, and the three connecting ribs 44 are evenly distributed at 120° to form an equivalent flow space inside the bean storage chamber 4. This ensures the falling speed of coffee beans and the continuity of grinding while maintaining structural strength.

[0055] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A hand-cranked coffee grinder, characterized in that: The device includes a handle, a rotating cover, a rotating shaft, a bean storage bin, a grinding assembly, and a powder storage tank. The rotating cover, bean storage bin, grinding assembly, and powder storage tank are arranged sequentially from top to bottom. The rotating cover is detachably installed over the top opening of the bean storage bin. The rotating shaft is rotatably installed inside the bean storage bin, and the bottom end of the rotating shaft is connected to the grinding assembly. One end of the handle can be inserted into the interior of the rotating cover from one side and detachably connected to the rotating cover. The top end of the rotating shaft can be inserted into the interior of the rotating cover from the bottom surface and detachably connected to the rotating cover. The handle and the rotating shaft are snap-fitted together inside the rotating cover.

2. The hand-cranked coffee grinder according to claim 1, characterized in that: The bottom of the rotating cover is provided with a pivot cavity, which extends vertically through the rotating cover. When the pivot is connected to the rotating cover, the top end of the pivot is inserted into the notch of the handle through the pivot cavity.

3. A hand-cranked coffee grinder according to claim 2, characterized in that: The rotating cover also has a handle mounting cavity, which extends horizontally. One end of the handle mounting cavity passes through the side wall of the rotating cover to form a handle mounting hole. The rotating shaft cavity communicates with the handle mounting cavity. When the handle is inserted into the handle mounting cavity through the handle mounting hole, the notch is located at the intersection of the rotating shaft cavity and the handle mounting cavity.

4. A hand-cranked coffee grinder according to claim 3, characterized in that: The outer side of the bean storage bin is provided with a handle storage cavity, which extends along the height direction of the bean storage bin and is used to store the handle.

5. A hand-cranked coffee grinder according to claim 4, characterized in that: The handle includes a rod and a handle, the handle is mounted on one end of the rod, the rod and the handle are in the shape of a "7", and the other end of the rod has the notch.

6. A hand-cranked coffee grinder according to claim 5, characterized in that: The rod is detachably mounted in the handle storage cavity. When the rod is in the handle storage cavity, the handle rests against the top surface of the rotating cover.

7. A hand-cranked coffee grinder according to claim 1, characterized in that: The storage bin has an internal shaft cavity that extends vertically. The shaft cavity is connected to the inner wall of the storage bin by several connecting ribs. The rotating shaft is installed in the shaft cavity, and the top and bottom of the rotating shaft protrude from the shaft cavity.

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