Hand-cranking bean grinder

Abstract

The utility model provides a hand-cranking bean grinding machine, which relates to the technical field of coffee grinding appliances and comprises a machine body, a connecting shell is fixed at the top end of the machine body, a threaded cover is embedded in the connecting shell, a transmission cavity is arranged on the top surface of the threaded cover, a gear set is arranged in the transmission cavity and comprises a gear support, and a transmission middle shaft is connected to the circle center of the bottom of the gear support. A rocking handle is connected to the top face of the gear support, an inner grinding core is connected to the tail end of the transmission middle shaft, an outer cutter head and a collecting bin are arranged at the tail end of the machine body, locking screws are connected into threaded holes in the surface of the machine body in a threaded mode, and the outer cutter head and the machine body are assembled and fixed through the multiple sets of locking screws, so that a traditional fixed outer cutter head is changed; when the outer cutter head is cleaned in the later period, a user can conveniently and rapidly disassemble or assemble the outer cutter head, the user is effectively helped to clean residual powder on the outer cutter head, the inner grinding core with the large inner diameter can be driven by matching a rocking handle and a gear set during hand cranking, and the grinding efficiency of the inner grinding core is improved.

Description

Technical Field

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

[0002] A coffee grinder is a tool used to grind coffee beans into small coffee particles. Coffee grinders can be divided into electric coffee grinders and hand-cranked coffee grinders according to their driving method. Although electric coffee grinders are labor-saving and fast, they lack user participation. In order to experience the grinding process and feel the aroma emitted during grinding, many users prefer to use hand-cranked coffee grinders to experience the fun.

[0003] According to patent publication number CN217959816U, a hand-cranked coffee grinder includes an upper body, a grinding mechanism, a lower body, and a fixing ring detachably connected between the upper and lower bodies. The inner ring of the fixing ring has an inwardly protruding boss, which can effectively fix the outer grinding core, reduce the movement space around the outer grinding core, and ensure that it will not shift due to external force during use, thus ensuring the uniformity of the coffee powder particles and making the grinding experience smoother for the user. In addition, the detachable connection between the fixing ring and the upper and lower bodies makes the installation and disassembly of the coffee grinder more convenient, without the need for other tools. After disassembly, it is easier to clean the coffee grinder, saving time and effort.

[0004] The above describes hand-cranked coffee grinders. Traditional hand-cranked coffee grinders are laborious and inefficient when grinding coffee beans manually. In addition, the outer blade of a traditional hand-cranked coffee grinder is usually fixed to the body and the two are integrated, which makes it difficult to clean the residual powder on the outer blade, thus affecting the flavor of freshly ground coffee. Furthermore, it is not convenient for users to quickly replace the outer blade component if it is damaged. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of traditional hand-cranked coffee grinders, which are laborious and inefficient when grinding coffee beans manually, and also make it inconvenient to quickly and individually replace the outer blade. Therefore, this invention proposes a hand-cranked coffee grinder.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a hand-cranked coffee grinder, comprising a body, a connecting shell fixed to the top of the body, a threaded cover fitted inside the connecting shell, a transmission cavity formed on the top surface of the threaded cover, a gear set provided inside the transmission cavity, the gear set including a gear bracket, a transmission shaft connected to the center of the bottom of the gear bracket, a crank handle connected to the top surface of the gear bracket, an inner grinding core connected to the end of the transmission shaft, a sun gear and planetary gears respectively connected to the top surface of the gear bracket, an outer blade disc and a collection chamber respectively provided at the end of the body, the outer blade disc being located between the collection chamber and the body, and a locking screw threaded into the threaded hole on the surface of the body.

[0007] As can be seen, the above technical solution uses a method of engaging the outer blade disc with the opening at the bottom of the machine body, and uses multiple sets of locking screws to assemble the outer blade disc with the machine body. This changes the traditional fixed outer blade disc, making it convenient for users to quickly disassemble or install the outer blade disc when cleaning it later. It effectively helps users clean the residual powder on the outer blade disc. When hand-cranked, the crank handle and gear set can drive the large-diameter inner grinding core, thereby improving the grinding efficiency.

[0008] Preferably, the surface of the threaded cover is threadedly connected to the inner wall of the connecting shell, and the machine body and the inner wall of the threaded cover are respectively fixed with limit tubes, and the transmission shaft is fitted into the limit tubes.

[0009] As can be seen, in the above technical solution, the threaded cover and the connecting shell are connected by threads, and the two can be quickly separated or installed.

[0010] Preferably, the sun gear is located at the center of the gear support, and the planet gears are located on the surface of the sun gear. The inner wall of the threaded cover is connected to a gear ring, and the surfaces of the planet gears mesh with the sun gear and the gear ring, respectively.

[0011] As can be seen, in the above technical solution, the reduction device of the planetary gear set composed of the sun gear, planet gears, gear ring and gear carrier, combined with the rocker handle, can rotate the transmission shaft together with the inner grinding core.

[0012] Preferably, an assembly head is fixed at the top of the transmission shaft, and the assembly head and the interface at the bottom of the gear bracket cooperate with each other.

[0013] As can be seen, in the above technical solution, the transmission shaft is engaged with the bottom surface of the gear bracket through the assembly head of the order, and the transmission shaft can rotate together with the gear bracket.

[0014] Preferably, the top surface of the threaded cap is fixed with a multi-legged connecting rod in a circumferential array, a limiting ring is provided at the center of the threaded cap, and the surface of the limiting ring is fixed to one end of the multi-legged connecting rod, and the connecting end of the crank handle is located inside the limiting ring.

[0015] As can be seen, in the above technical solution, the multi-leg connecting rod is used to assist the user in rotating and removing or installing the threaded cover, and the limiting ring facilitates the alignment and installation of the connecting end of the crank handle.

[0016] Preferably, the surface of the top of the outer cutter disc is in contact with the inner wall at the end of the machine body, and one end of the locking screw abuts against the surface of the outer cutter disc.

[0017] As can be seen, in the above technical solution, the outer cutter head is locked with three locking screws 7, allowing users to easily and quickly replace the outer cutter head.

[0018] Preferably, the inner wall of the collection chamber has a circumferential array of snap-fit ​​protrusions, and the outer blade disc has a circumferential array of assembly grooves, with the snap-fit ​​protrusions engaging with the assembly grooves.

[0019] As can be seen, in the above technical solution, the specific interface of the assembly slot can align the buckle protrusion with the inlet and rotate it to make the buckle protrusion engage at the engagement position of the assembly slot, thereby completing the connection between the collection chamber and the outer cutter disc.

[0020] Beneficial effects

[0021] In this invention, the outer blade disc engages with the opening at the bottom of the machine body, and multiple sets of locking screws are used to assemble the outer blade disc with the machine body. This changes the traditional fixed outer blade disc design, allowing users to quickly disassemble or install the outer blade disc for later cleaning, effectively helping users clean residual coffee powder on the outer blade disc. Furthermore, since the outer blade disc is prone to wear and tear over long-term use, its quick disassembly allows for individual replacement of the outer blade disc component after damage. The outer blade disc is directly exposed and in direct contact with the user's palm during grinding, effectively dissipating static electricity generated during the grinding process. This significantly reduces the amount of coffee powder adhering to the area around the blade disc due to static electricity, effectively reducing residual coffee powder and waste.

[0022] In this invention, the crank handle is designed to be sunken and bent at an angle, which increases the leverage force points and makes it easier to exert force in the initial stage of grinding beans. Combined with the planetary gear set and the large grinding core, it makes the grinding process labor-saving while ensuring grinding efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a cross-sectional view of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the fuselage of this utility model;

[0026] Figure 4 This is an exploded view of the present invention;

[0027] Figure 5 This is a schematic diagram of the disassembly of the outer cutter head of this utility model;

[0028] Figure 6 This is a structural diagram of the gear set of this utility model;

[0029] Figure 7 This is an overall structural diagram of the transmission shaft of this utility model.

[0030] Reference numerals: 1. Body; 11. Connecting shell; 12. Limiting tube; 2. Transmission shaft; 21. Assembly head; 3. Inner grinding core; 4. Outer cutter head; 41. Assembly slot; 5. Gear set; 51. Gear bracket; 52. Sun gear; 53. Planetary gears; 54. Gear ring; 6. Handle; 7. Collection chamber; 71. Snap-fit ​​protrusion; 8. Locking screw; 9. Threaded cover; 91. Transmission cavity; 92. Multi-leg connecting rod; 93. Limiting ring. Detailed Implementation

[0031] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0032] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Specific implementation examples:

[0034] Reference Figure 1-7A hand-cranked coffee grinder includes a body 1, with a connecting shell 11 fixed to the top of the body 1. A threaded cap 9 is fitted inside the connecting shell 11, and a transmission cavity 91 is formed on the top surface of the threaded cap 9. A gear set 5 is provided in the transmission cavity 91, and the gear set 5 includes a gear bracket 51. A transmission shaft 2 is connected to the center of the bottom of the gear bracket 51, and a crank handle 6 is connected to the top surface of the gear bracket 51. Further explanation: Traditional crank handles 6 are all straight lines when viewed from a top view. This is not conducive to applying force in the initial stage of grinding coffee. Moreover, the crank handle 6 has a single fixed point, and under the lever principle, the fixed device experiences a huge and continuous upward force, which is detrimental. To improve product stability and lifespan, the traditional crank handle 6 design has been modified. The crank handle 6 now features a sunken and angled bend, increasing the leverage point and allowing for better force application in the initial grinding stage. This also reduces the upward force on the fixed components. The sunken crank handle 6 increases the lever fulcrum, reducing the single force on the fixed components and extending product lifespan. The angled bend design enhances the guiding effect of the force, aligning the direction of the hand-cranking force with the guiding direction, thus improving the initial grinding stage and facilitating convenient hand-crank grinding. The inner grinding core 3 is connected to the end of the transmission shaft 2. The top surface of the gear support 51 is connected to a sun gear 52 and a planetary gear 53. The sun gear 52 is located at the center of the gear support 51, and the planetary gear 53 is located on the surface of the sun gear 52. The inner wall of the threaded cap 9 is connected to a gear ring 54, and the surfaces of the planetary gear 53 mesh with the sun gear 52 and the gear ring 54 respectively. The end of the machine body 1 is provided with an outer blade 4 and a collection chamber 7, and the outer blade 4 is located between the collection chamber 7 and the machine body 1. The hand-cranked coffee grinder is mainly composed of the machine body 1, the crank handle 6, the drive shaft 2, and the outer blade 4. The machine body 1 is the outer shell of the machine, and the drive shaft 2 is connected to... The inner grinding core 3 and the inner wall of the outer blade disc 4 form a grinding chamber. During grinding, manually rotate the threaded cap 9 to separate it from the connecting shell 11 at the top of the machine body 1. Put the coffee beans to be ground into the machine body 1, and then thread the threaded cap 9 and the connecting shell 11 to seal the inlet. At this time, the user can manually crank the handle 6 to drive the transmission shaft 2 and the inner grinding core 3 connected at the end to rotate to complete the grinding of the coffee beans. Finally, the qualified powder will fall into the collection chamber 7 below through the gap between the inner grinding core 3 and the outer blade disc 4. The user can directly remove the collection chamber 7 to collect the powder separately.

[0035] The inner grinding core 3 connected to the end of the transmission shaft 2 has a diameter of 36mm. Traditional hand-cranked coffee grinders with an inner grinding core 3 diameter less than or equal to 32mm may experience difficulty grinding. Therefore, to ensure normal grinding and improve grinding efficiency, it is used in conjunction with a gear set 5. The gear set 5 is a planetary gear set, composed of a sun gear 52, planet gears 53, and a ring gear 54. The ring gear 54 is located outside the gear support 51, providing a stable support structure for the planet gears 53, ensuring that the planet gears 53 can run on the correct track and withstand the load. The star wheel 53 has a large friction and pressure. There is one sun wheel 52 located at the center of the gear support 51, and three planetary wheels 53 on its surface. The two mesh with each other, and the reduction gear ratio is 1:3.1. The rotation of the crank 6 synchronously drives the sun wheel 52 to rotate at the same speed. The sun wheel 52 drives the gear support 51 to rotate through the planetary wheels 53. To further explain, the sun wheel 52 rotates 3.1 times, and the planetary wheels 53 rotate 1 time. The gear support 51 drives the inner grinding core 36 to rotate at the same speed through the transmission shaft 2, which makes the grinding process labor-saving while ensuring grinding efficiency.

[0036] In the embodiments, the table below compares the force and time required to grind the same 15 grams of coffee beans with four different sizes of inner grinding cores 3, with and without the gear set 5 reduction device:

[0037]

[0038] In this embodiment, the surface of the threaded cover 9 is threadedly connected to the inner wall of the connecting shell 11. Limiting tubes 12 are fixed to the inner walls of the machine body 1 and the threaded cover 9, respectively. The transmission shaft 2 is fitted into the limiting tube 12. An assembly head 21 is fixed to the top of the transmission shaft 2, and the assembly head 21 cooperates with the interface at the bottom of the gear bracket 51. A multi-legged connecting rod 92 is fixed in a circumferential array on the top surface of the threaded cover 9. A limiting ring 93 is provided at the center of the threaded cover 9, and the surface of the limiting ring 93 is fixed to one end of the multi-legged connecting rod 92. The connecting end of the crank handle 6 is located within the limiting ring 93. The connecting ends of the sun gear 52, planet gears 53, and crank handle 6 are all located on the gear bracket 51. The sun gear 52, planet gears 53, and gear ring 54 are all located within the transmission cavity 91 of the threaded cover 9. The gear bracket 51 is installed in the threaded cover 9, and the gear ring 54 is installed in... The crank handle 6 is installed on the inner wall of the threaded cover 9, and its connecting end can be directly inserted into the connection of the gear bracket 51. Manually controlling the rotation of the crank handle 6 will cause the gear bracket 51 and the transmission shaft 2 connected at the bottom to rotate together to complete the grinding. There are two sets of limiting tubes 12, one set is fixed to the inner wall of the threaded cover 9, and the other set is fixed to the inner wall of the machine body 1. The assembly head 21 at the top of the transmission shaft 2 is polygonal and fits into the limiting tube 12 fixed at the threaded cover 9, and is inserted into the interface at the bottom of the gear bracket 51. The top surface of the threaded cover 9 is fixed with a limiting ring 93 by a multi-leg connecting rod 92. The connecting end of the crank handle 6 is fitted into the limiting ring 93, which makes it easy for the user to connect the crank handle 6. At the same time, when the user needs to install or remove the threaded cover 9 from the connecting shell 11, he / she can remove or install it by squeezing the multi-leg connecting rod 92.

[0039] A locking screw 8 is threaded into the threaded hole on the surface of the machine body 1. The top surface of the outer cutter disc 4 fits against the inner wall at the end of the machine body 1, and one end of the locking screw 8 abuts against the surface of the outer cutter disc 4. The inner wall of the collection chamber 7 has a circumferential array of snap-fit ​​protrusions 71. The surface of the outer cutter disc 4 has a circumferential array of mounting grooves 41, and the snap-fit ​​protrusions 71 engage with the mounting grooves 41. The outer cutter disc 4 is located between the machine body 1 and the collection chamber 7. The top of the outer cutter disc 4 is directly aligned and fitted with the inner side of the bottom opening of the machine body 1, and the outer cutter disc 4 is locked to the machine body 1 by the locking screw 8. The mounting groove 41 at the bottom of the outer cutter disc 4 and the collection chamber 7 are connected. The latching protrusions 71 on the inner wall engage with each other. When disassembling, first rotate and pull down the collection chamber 7 to separate the latching protrusions 71 from the assembly groove 41, and then remove the locking screws 8 to quickly help the user remove the outer blade disc 4. Similarly, during installation, it can be installed step by step, which facilitates the cleaning of residual powder on the outer blade disc 4 later. At the same time, the outer blade disc 4 can be replaced separately when damaged, which is low cost. The outer blade disc 4 is directly exposed to the user's palm, which can effectively conduct away the static electricity generated during the grinding process, greatly reducing the situation where coffee powder is attracted around the blade disc due to static electricity, and effectively reducing residual powder.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hand-cranked coffee grinder, comprising a body (1), characterized in that: The top of the body (1) is fixed with a connecting shell (11), and a threaded cover (9) is fitted inside the connecting shell (11). A transmission cavity (91) is opened on the top surface of the threaded cover (9). A gear set (5) is provided in the transmission cavity (91). The gear set (5) includes a gear bracket (51). A transmission shaft (2) is connected to the center of the bottom of the gear bracket (51). A rocker arm (6) is connected to the top surface of the gear bracket (51). An inner grinding core (3) is connected to the end of the transmission shaft (2). A sun gear (52) and a planet gear (53) are connected to the top surface of the gear bracket (51). An outer cutter disc (4) and a collection chamber (7) are provided at the end of the body (1). The outer cutter disc (4) is located between the collection chamber (7) and the body (1). A locking screw (8) is threaded into the threaded hole on the surface of the body (1).

2. The hand-cranked coffee grinder according to claim 1, characterized in that: The surface of the threaded cover (9) is threadedly connected to the inner wall of the connecting shell (11). The inner walls of the machine body (1) and the threaded cover (9) are respectively fixed with limit tubes (12), and the transmission shaft (2) is fitted into the limit tube (12).

3. A hand-cranked coffee grinder according to claim 1, characterized in that: The sun gear (52) is located at the center of the gear support (51), and the planet gear (53) is located on the surface of the sun gear (52). The inner wall of the threaded cover (9) is connected to the gear ring (54), and the surface of the planet gear (53) meshes with the sun gear (52) and the gear ring (54) respectively.

4. A hand-cranked coffee grinder according to claim 1, characterized in that: The top of the transmission shaft (2) is fixed with an assembly head (21), and the assembly head (21) and the interface at the bottom of the gear bracket (51) cooperate with each other.

5. A hand-cranked coffee grinder according to claim 1, characterized in that: The top surface of the threaded cap (9) is fixed with a multi-legged connecting rod (92) in a circumferential array. A limiting ring (93) is provided at the center of the threaded cap (9), and the surface of the limiting ring (93) is fixed to one end of the multi-legged connecting rod (92). The connecting end of the crank handle (6) is located inside the limiting ring (93).

6. A hand-cranked coffee grinder according to claim 1, characterized in that: The surface of the top of the outer cutter disc (4) is in contact with the inner wall at the end of the machine body (1), and one end of the locking screw (8) abuts against the surface of the outer cutter disc (4).

7. A hand-cranked coffee grinder according to claim 1, characterized in that: The inner wall of the collection chamber (7) has a circumferential array of snap-fit ​​protrusions (71), and the outer blade disc (4) has a circumferential array of mounting grooves (41), and the snap-fit ​​protrusions (71) and the mounting grooves (41) engage with each other.

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