Folding crank assembly and bean grinder

Abstract

The utility model discloses a folding crank assembly which comprises a crank, an adapter ring and a crank head, the crank is hinged to the outer wall of the adapter ring, the crank head is rotatably arranged at the end, away from the adapter ring, of the crank, a locking mechanism is arranged on the crank, and the locking mechanism comprises a button, a handle sleeve, a limiting pin, a spring and a rotating shaft. When the crank rotates to the position above the adapter ring, the pin body is inserted into the through hole of the handle sleeve to lock the crank, and after the button is pressed down, the button pushes the limiting pin and the pin body to leave the through hole of the handle sleeve, so that the crank can rotate. The utility model further discloses a bean grinder. Compared with the prior art, the rocking handle with the locking mechanism is arranged on the adapter ring, the rocking handle is hinged to the adapter ring, the rocking handle can be directly folded and stored when not used, storage is convenient, occupied space is saved, the rocking handle is locked through the locking mechanism after being unfolded, and the rocking handle cannot be automatically folded downwards due to external force; and the rotation smoothness during use is ensured.

Description

Technical Field

[0001] The utility model relates to a grinder, in particular to a folding crank assembly and a bean grinder. Background Art

[0002] At present, hand-cranked bean grinders on the market are generally household products, usually used for grinding coffee beans. In existing hand-cranked bean grinders on the market, the crank is detachably fixed on the transmission shaft of the grinder body. When in use, it is necessary to assemble the grinder body and the crank, which is not only time-consuming but also laborious. When storing, if the crank is not removed, it will occupy a large storage space. However, there is a problem of storing the crank after it is removed. Some bean grinders are provided with a silicone ring on the grinder body, and a silicone sleeve is provided on the silicone ring to insert the crank into the silicone sleeve so that the grinder body and the crank can be stored together. However, this method has the problem that the silicone ring is prone to odor during use, resulting in frequent position adjustment and inconvenient use. To avoid this problem, there is also a bean grinder with a folding crank on the market. Since the crank and the adapter ring are movably hinged, during the horizontal rotation of the crank, the crank is prone to fold by itself due to uneven force, resulting in unsmooth rotation during the rotation process, easy jamming, and the crank is also easy to touch the hand holding the grinder body. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a folding crank and a bean grinder, and the technical problem to be solved is to ensure the smoothness of the crank rotation during use while facilitating storage.

[0004] To solve the above problems, the utility model is realized by adopting the following technical solutions: A folding crank assembly includes a crank, an adapter ring, and a crank head. The crank is hinged to the outer wall of the adapter ring to enable the crank to rotate on the adapter ring. The crank head is rotatably arranged at one end of the crank away from the adapter ring. A locking mechanism is provided on the crank. The locking mechanism includes a button, a grip sleeve, a limit pin, a spring, and a rotating shaft. The rotating shaft is hollow. An axial hole adapted to the rotating shaft is provided on the adapter ring, and the rotating shaft is fixed in the axial hole and cannot rotate. The spring and the limit pin are arranged in the cavity of the rotating shaft. Hinge parts are symmetrically arranged on the crank. One hinge part is connected to the rotating shaft, and the other hinge part is connected to the adapter ring through a hinge screw. An articulated through hole is provided on the hinge part opposite to the rotating shaft, and the articulated through hole is opposite to the cavity of the rotating shaft. The grip sleeve is arranged in the articulated through hole. A grip sleeve through hole is provided on the grip sleeve. The button is arranged in the grip sleeve through hole. The button is opposite to the limit pin. A pin body that can be inserted into the grip sleeve through hole is provided at one end of the limit pin opposite to the button. When the crank rotates above the adapter ring, the pin body is inserted into the grip sleeve through hole to lock the crank. When the button is pressed, the button pushes the limit pin, and the pin body leaves the grip sleeve through hole, enabling the crank to rotate.

[0005] Furthermore, a first boss portion is provided on the inner wall of the orifice at the end of the handle through-hole away from the adapter ring, and the edge of the button abuts against the first boss portion.

[0006] Furthermore, a second boss portion is provided in the inner wall of the orifice at one end of the handle through-hole opposite to the limit pin, forming a pin body insertion hole. The pin body is adapted to the pin body insertion hole, and a pushing portion that can be inserted into the pin body insertion hole is provided at one end of the button opposite to the pin body.

[0007] Furthermore, a circumferentially protruding third boss portion is provided on the outer wall of one end of the rotating shaft opposite to the crank, and a circumferentially protruding fourth boss portion is provided on the inner wall of the orifice at one end of the hinged through-hole opposite to the rotating shaft. The third boss portion abuts against the fourth boss portion.

[0008] Furthermore, the cross-sectional shape of the rotating shaft is rectangular, and the rotating shaft hole is adapted to the cross-sectional shape of the rotating shaft.

[0009] Furthermore, the hinged through-hole includes a rectangular hole and a circular hole. The circular hole is adjacent to the adapter ring. The fourth boss portion is provided in the circular hole. Both the fourth boss portion and the third boss portion are circular rings. The cross-sectional shape of the handle is adapted to the cross-sectional shape of the rectangular hole, and the handle is provided in the rectangular hole.

[0010] Furthermore, the cross-section of the handle through-hole is rectangular, and the shape of the button is adapted to the handle through-hole.

[0011] Furthermore, a button head extending outside the handle through-hole is provided at one end of the button away from the pushing portion.

[0012] The present utility model also discloses a bean grinder, which includes a grinder body. A rotating shaft is provided on the grinder body. The folding crank assembly as described above is provided on the grinder body. A rotating shaft seat is provided at the center of the adapter ring. A shaft seat through-hole adapted to the rotating shaft is provided on the rotating shaft seat. The adapter ring is connected and fixed to the rotating shaft after a fastening screw passes through the shaft seat through-hole.

[0013] Compared with the prior art, the present utility model has a crank with a locking mechanism provided on the adapter ring. The crank is hinged to the adapter ring, realizing that the crank can be directly folded and stored when not in use, which is convenient for storage and saves occupied space. After unfolding, it is locked by the locking mechanism, so that it will not fold down by itself due to external force, ensuring the smoothness of rotation during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an exploded schematic view of the folding crank assembly of the present utility model.

[0015] Figure 2 is a cross-sectional view of the folding crank assembly of the present utility model after unfolding.

[0016] Figure 3 It is a partial cross-sectional view of the crank of the present utility model.

[0017] Figure 4 It is a partial cross-sectional view of the crank of the present utility model after being unfolded.

[0018] Figure 5 It is a partial cross-sectional view of the crank of the present utility model after being folded.

[0019] Figure 6 It is a schematic structural view of the bean grinder of the present utility model.

[0020] Figure 7 It is an exploded schematic view of the bean grinder of the present utility model.

[0021] Figure 8 It is a schematic view of the internal structure of the bean grinder of the present utility model. Detailed implementation manners

[0022] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] As Figures 1 to 3 shown, the present utility model discloses a folding crank assembly including a crank 1, an adapter ring 2 and a crank head 3. The crank head 3 is rotatably arranged at one end of the crank 1 away from the adapter ring 2. The crank head 3 can be connected to the crank 1 by a detachable structure of the prior art. A locking mechanism is provided on the crank 1. The locking mechanism includes a button 4, a grip 5, a limit pin 6, a spring 7 and a rotating shaft 8. The rotating shaft 8 is hollow and has holes communicating with the inner cavity at both ends. A rotating shaft hole 9 adapted to the rotating shaft 8 is provided on the adapter ring 2. The rotating shaft 8 is fixed in the rotating shaft hole 9 by bonding or screws and cannot rotate. The spring 7 and the limit pin 6 are arranged in the cavity of the rotating shaft 8. Hinge parts 10 are symmetrically arranged on the crank 1. One of the hinge parts 10 is connected to the rotating shaft 8, and the other hinge part 10 is connected to the adapter ring 2 through a hinge screw 11. As Figure 2 can be seen from, the cross-section of the rotating shaft hole 9 is square, and the cross-section of the rotating shaft 8 is adapted to the rotating shaft hole 9 so that the rotating shaft 8 can be inserted into the rotating shaft hole 9. A hinge through hole 12 is provided on the hinge part 10 opposite to the rotating shaft 8. The hinge through hole 12 is opposite to the cavity of the rotating shaft 8. The grip 5 is fixed in the hinge through hole 12. A grip through hole 13 is provided on the grip 5. The button 4 is arranged in the grip through hole 13. The button 4 is opposite to the limit pin 6. A pin body 14 that can be inserted into the grip through hole 13 is provided at one end of the limit pin 6 opposite to the button 4. When the crank 1 rotates above the adapter ring 2, the pin body 14 is inserted into the grip through hole 13 to lock the crank 1. When the button 4 is pressed, the button 4 pushes the limit pin 6, and the pin body 14 leaves the grip through hole 13, making the crank 1 rotatable.

[0024] AsFigure 1 As shown, the pin body 14 is formed by setting a concave notch at one end of the limit pin 6 opposite to the button 4. Specifically, a second boss portion 16 is provided on the inner wall of the orifice at one end of the sleeve through hole 13 opposite to the limit pin 6, so that the remaining part of the orifice at this end forms a pin body insertion hole 17. The cross-sectional shape of the pin body 14 is adapted to the shape of the orifice of the pin body insertion hole 17. When the crank 1 is unfolded above the adapter ring 2, the pin body insertion hole 17 is aligned with the pin body 14, enabling the pin body 14 to enter the pin body insertion hole 17, thereby playing a locking role. At this time, the crank 1 is restricted and cannot be rotated and folded ( Figure 4 as shown); a pushing portion 18 that can be inserted into the pin body insertion hole 17 is provided at one end of the button 4 opposite to the pin body 14. The pushing portion 18 is adapted to the pin body insertion hole 17. When the button 4 is pressed, the pushing portion 18 of the button 4 pushes the pin body 14 to move towards the shaft hole 9, causing the pin body 14 to be pushed out of the pin body insertion hole 17. At this time, when the crank 1 is rotated downward, the crank 1 drives the button 4 and the sleeve 5 to rotate, causing the pin body insertion hole 17 to be misaligned with the pin body 14 ( Figure 5 as shown), and at this time, the second boss portion 16 abuts against the limit pin 6.

[0025] Preferably, as Figure 2 shown, the hinge through hole 12 includes a rectangular hole 121, and the rectangular hole 121 is specifically a hole with a square cross-sectional shape. Correspondingly, the cross-sectional shape of the sleeve 5 is adapted thereto, so as to enable the sleeve 5 to rotate together during the rotation of the crank.

[0026] As Figures 2 to 4 shown, the cross-section of the sleeve through hole 13 is a square hole, and the cross-sectional shape of the button 4 is adapted thereto, so that it can rotate together with the sleeve. A first boss portion 15 is provided on the inner wall of the orifice at one end of the sleeve through hole 13 away from the adapter ring 2. The edge of the button 4 abuts against the first boss portion 15 to prevent the button 4 from coming out of the sleeve through hole 13. Specifically, the first boss portion 15 is a square ring body. The second boss portion 16 is provided on the inner wall of one side orifice of the sleeve through hole 13. A button head 21 that extends out of the sleeve through hole 13 is provided at one end of the button 4 away from the pushing portion 18. The button head 21 extends out from the hole in the center of the first boss portion 15, and the button head 21 can be cylindrical or rectangular columnar.

[0027] As Figures 1 to 4 shown, a third boss portion 19 that protrudes in a circle is provided on the outer wall of one end of the rotating shaft 8 opposite to the crank 1. A circular hole 122 is provided at one end of the hinge through hole 12 opposite to the rotating shaft 8. A fourth boss portion 20 that protrudes in a circle is provided on the inner wall of the orifice at one end of the circular hole 122 opposite to the rotating shaft 8. The third boss portion 19 abuts against the fourth boss portion 20. Both the third boss portion 19 and the fourth boss portion 20 are circular rings, so as to enable the crank 1 to rotate but not drive the rotating shaft 8 to rotate. From Figure 2 and Figure 4It can be seen that there is also a fifth boss portion 22 provided between the rotating shaft 8 and the third boss portion 19. The fifth boss portion 22 is annular, and its outer diameter is smaller than the outer diameter of the third boss portion 19 and larger than the side length of the rotating shaft 8, so as to form a stepped structure among the third boss portion 19, the fifth boss portion 22 and the rotating shaft 8. The inner diameter of the fourth boss portion 22 is slightly larger than the outer diameter of the fifth boss portion 22. The fifth boss portion 22 is arranged in the inner hole of the fourth boss portion 22 to ensure smoother rotation and at the same time ensure that the rotation of the crank does not drive the rotation of the rotating shaft 8.

[0028] As Figure 1 and Figure 2 shown, the cross-sectional shape of the inner cavity of the rotating shaft 8 is square, and the cross-sectional shape of the limit pin 6 is adapted thereto and is also square to prevent the limit pin 6 from rotating during the rotation of the crank 1.

[0029] As Figures 6 to 8 shown, the present utility model also discloses a bean grinder, which includes a grinder body 100. A rotating shaft 101 connected to the blade is arranged in the grinder body 100. The above-mentioned folding crank assembly is provided on the grinder body 100, and its specific structure will not be described in detail here. A rotating shaft seat 22 is provided at the center of the adapter ring 2. An axially seated through hole 23 adapted to the rotating shaft 101 is provided on the rotating shaft seat 22. The cross-section of the shaft body of the upper end of the rotating shaft 101 extending out of the grinder body 100 is a special-shaped structure, and a screw connection hole is provided on its end face. After inserting the special-shaped structure of the rotating shaft 101 extending out of the grinder body 100 into the axially seated through hole 23 and connecting it with the screw connection hole through the fastening screw 102, the adapter ring 2 is rotatably fixed on the grinder body 100.

[0030] When the crank of the present utility model is folded, as Figure 5 can be seen, the pin body 14 is misaligned with the pin insertion hole 17. At this time, the limit pin 6 is completely located in the inner cavity of the rotating shaft 8, and at the same time the spring 7 is compressed.

[0031] As Figure 2 and Figure 4 shown, after the crank is unfolded upward, the pin body 14 is aligned with the pin insertion hole 17. Under the action of the spring 7 resetting, the limit pin 6 makes the pin body 14 insert into the pin insertion hole 17, so that the crank 1 is restricted from rotating. At this time, the crank can be rotated horizontally to drive the rotation of the rotating shaft 101.

[0032] The present utility model realizes that the crank can be stored together with the grinder body without being removed, which is not only convenient for storage but also saves occupied space.

Claims

1. A folding crank assembly, comprising a crank (1), an adapter ring (2) and a crank head (3), characterized in that: The crank (1) is hinged to the outer wall of the adapter ring (2) so that the crank (1) can rotate on the adapter ring (2). The crank head (3) is rotatably arranged at one end of the crank (1) away from the adapter ring (2). A locking mechanism is provided on the crank (1). The locking mechanism includes a button (4), a grip sleeve (5), a limit pin (6), a spring (7) and a rotating shaft (8). The rotating shaft (8) is hollow. A rotating shaft hole (9) adapted to the rotating shaft (8) is provided on the adapter ring (2). The rotating shaft (8) is fixed in the rotating shaft hole (9) and cannot rotate. The spring (7) and the limit pin (6) are arranged in the cavity of the rotating shaft (8). Hinge portions (10) are symmetrically arranged on the crank (1). One hinge portion (10) is connected to the rotating shaft (8), and the other hinge portion (10) is connected to the adapter ring (2) through a hinge screw (11). A hinge through hole (12) is provided on the hinge portion (10) opposite to the rotating shaft (8). The hinge through hole (12) is opposite to the cavity of the rotating shaft (8). The grip sleeve (5) is arranged in the hinge through hole (12). A grip sleeve through hole (13) is provided on the grip sleeve (5). The button (4) is arranged in the grip sleeve through hole (13). The button (4) is opposite to the limit pin (6). A pin body (14) that can be inserted into the grip sleeve through hole (13) is provided at one end of the limit pin (6) opposite to the button (4). When the crank (1) rotates above the adapter ring (2), the pin body (14) is inserted into the grip sleeve through hole (13) to lock the crank (1). When the button (4) is pressed, the button (4) pushes the limit pin (6), and the pin body (14) leaves the grip sleeve through hole (13), enabling the crank (1) to rotate.

2. The folding crank assembly according to claim 1, wherein: A first boss portion (15) is provided on the inner wall of the orifice at the end of the grip sleeve through hole (13) away from the adapter ring (2). The edge of the button (4) abuts against the first boss portion (15).

3. The folding crank assembly according to claim 2, wherein: A second boss portion (16) is provided in the inner wall of the orifice at the end of the grip sleeve through hole (13) opposite to the limit pin (6), forming a pin body insertion hole (17). The pin body (14) is adapted to the pin body insertion hole (17). A pushing portion (18) that can be inserted into the pin body insertion hole (17) is provided at one end of the button (4) opposite to the pin body (14).

4. The folding crank assembly according to any one of claims 1-3, characterized in that: A third boss portion (19) protruding in a circumferential shape is provided on the outer wall of one end of the rotating shaft (8) opposite to the crank (1). A fourth boss portion (20) protruding in a circumferential shape is provided on the inner wall of the orifice at one end of the hinge through hole (12) opposite to the rotating shaft (8). The third boss portion (19) abuts against the fourth boss portion (20).

5. The folding crank assembly according to claim 4, wherein: The cross-sectional shape of the rotating shaft (8) is rectangular, and the cross-sectional shape of the rotating shaft hole (9) is adapted to that of the rotating shaft (8).

6. The folding crank assembly according to claim 5, wherein: The hinge through hole (12) includes a rectangular hole (121) and a circular hole (122). The circular hole (122) is adjacent to the adapter ring (2). The fourth boss portion (20) is arranged in the circular hole (122). Both the fourth boss portion (20) and the third boss portion (19) are circular rings. The cross-sectional shape of the grip sleeve (5) is adapted to that of the rectangular hole (121), and the grip sleeve (5) is arranged in the rectangular hole (121).

7. The folding crank assembly according to claim 6, wherein: The cross-section of the grip through-hole (13) is rectangular, and the shape of the button (4) is adapted to the grip through-hole (13).

8. The folding crank assembly according to claim 7, wherein: One end of the button (4) away from the pushing part (18) is provided with a button head (21) extending outside the grip through-hole (13).

9. A legume grinder, comprising a grinder body (100), and a rotating shaft (101) is provided on the grinder body (100), characterized in that: The grinder body (100) is provided with a folding crank assembly as described in any one of claims 1-8. A rotating shaft seat (22) is provided at the center of the adapter ring (2). An axial seat through-hole (23) adapted to the rotating shaft (101) is provided on the rotating shaft seat (22). The adapter ring (2) is connected and fixed to the rotating shaft (101) by a fastening screw (102) passing through the axial seat through-hole (23).

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