TWI611784B - Manual coffee bean grinder - Google Patents

Abstract

The invention relates to a hand-cranked coffee grinder, which comprises a fixed seat set, which comprises an upper base and a strut extending at a front end of the upper base to form a fixed disc body for fixing on a platform. The strut is connected to one end of the upper base; the grinder group comprises a seat fixed to the strut, a grinder base fixed to the seat body, and a grinding head assembled on the grinder base a grinding ring and a bearing, a pin member at the center of the grinder base for threading the center hole of the grinding head; and a bean hand crank group including a rotating shaft portion, a feeding slot, and a The guide rod and the rotating shaft portion are sleeved in the bearing of the grinding bean group, the guiding rod is fixed under the feeding trough, the guiding rod is sleeved with a spring, and the spring is protruded by two protrusions protruding radially; thereby, rotating The bean-carrying group drives the grinder group to grind the coffee beans.

Description

Hand shake coffee grinder

The invention relates to a coffee grinder, in particular to a hand-cranked coffee grinder which can be stably fixed on a table and can be operated by one hand, which can adjust the particle size of the coffee powder according to the needs of the user, and The grinder mechanism is designed to rotate on the same central axis, so that the unevenness of the particle size of the coffee powder is not caused by the eccentric rotation during the grinding of the coffee beans.

According to, coffee has gradually become a mainstream culture in modern times. Because caffeine contained in coffee stimulates the central nervous system, causing emotional excitement, reduced drowsiness and reduced fatigue, many people will have a cup of coffee in the morning; Coffee is a beverage brewed from roasted coffee beans. Coffee beans are the seeds of coffee trees. Planting coffee trees needs to be planted at a suitable altitude according to the variety. Different environments will also make coffee beans different. The flavor. The dark red fruit harvested on the coffee tree, after peeling, sun drying and other procedures, and finally leaving the seed, which is the raw bean of coffee, this raw bean will become a common brown bean after baking, and the baking is roughly divided. For light baking, medium baking, deep baking, different degrees of baking, the flavor left by the coffee beans will also be different.

After roasting, the coffee beans need to be ground into powder to brew coffee. The grinding device is generally divided into flat (Flat Burrs) or Conical Burrs, and the flat shape is the style of a ghost tooth cutter or a flat cutter. The taper is made by grinding the coffee powder with the gap between a ring body and a conical knife. The particle size of the coffee powder also affects the flavor of the extracted coffee liquid when hot water is added. It is known that brewing a cup of coffee requires attention. The details are quite a lot. At present, there are two types of electric grinders, electric and hand-operated. The electric grinder is fast and can grind a large amount of beans, but the price is high. The hand-cranked grinder needs to be used manually, so the grinding speed is slow, but The price is much cheaper than the electric one.

The Republic of China new patent publication No. TW M518950 "grinding ring seat of grinder" is a hand-cranked grinder with a square body for receiving the powder of coffee beans, and the grinding part is pressed against the stamping guide piece and Grinding the tooth edge, however, this square system will make it difficult for the user to hold. When grinding the bean, the body will constantly shake and cannot be stabilized on the table top; in addition, the Republic of China new patent announcement number TW M541816 "hand-cranked grinder An improvement is provided for the disadvantage of being difficult to hold, and a grip portion is formed between the convex ring and the lower convex ring on the body, and the overall shape is similar to a dumbbell. When the user holds the body, the upper convex ring and the lower portion The convex ring just touches the thumb, forefinger and the little finger below the palm of the hand, so that the body is firmly held so that the hand is not easy to slide.

However, as can be seen from the two previous patents, the current hand-cranked grinders require the user to manipulate through both hands, and according to past experience, the hand system used to hold the grinder needs to be superior. The other hand, which is responsible for the greater power of the rotating hand, needs to use more force to stabilize the grinder when turning the grinder. Therefore, even if the M541816 case has an improved design for this problem, It only allows the user to have a more comfortable grip, and can not solve the problem that the stable grinder needs a large force; in addition, today's hand-cranked grinder, the finished coffee powder is falling In a closed container, it is difficult to judge the thickness of the coffee powder at the initial stage, and the part from the handle to the grinding body does not have a good support design, so the grinding usually causes shaking, resulting in the grinding head to the grinding ring. Non-concentric operation causes the particle size of the coffee powder after grinding to be different, which affects the brewing and extracting flavor.

In this way, how to provide a hand-cranked grinder that allows the user to reduce the force for stabilizing the grinder with both hands, even without using a human hand to assist the stable grinder, and to improve the rotary grinding of the hand grinder The convenience of the user can be easily used by the user who is less powerful, and at the same time, the quality of the coffee powder is ground, and the particle size of the ground coffee powder is not affected to affect the extraction flavor, which is what the inventor thinks. direction.

Nowadays, the inventor is in view of the fact that the above-mentioned existing hand-cranked grinder has many defects in actual use, so it is a tireless spirit, and with its rich professional knowledge and years of practical experience, Improvements have been made, and the present invention has been developed based on this.

The main object of the present invention is to provide a hand-cranked coffee grinder which can smoothly operate the present invention without requiring an extra force from the user to secure the grinder, so that even a less powerful user can It is laborious to operate, and the inventor maintains the grinding head and the grinding ring mechanism design on the same center line. This design can also avoid the shaking of the grinder during grinding, and can maintain the consistency of the ground coffee powder thickness.

In order to achieve the above-mentioned object, a hand-cranked coffee grinder includes a fixed seat set including a fixed base and an upper base and a strut extending at a front end of the upper base to form a fixed a disk body for fixing to a platform, the struts being connected to one end of the upper base; a grinding bean set comprising a seat body fixed to the struts and a fixed body a grinder base, and a grinding head, a grinding ring and a bearing, which are sequentially assembled to the grinder base, and the grinder base is two columnar bodies corresponding to and fixed to the base body, The center of the bean base has a pin member for wearing the center hole of the polishing head, and a first class edge and a second class edge are disposed on the inner side of the grinding bean base, and the first class edge is used for the grinding ring. The second class edge device is configured to be the bearing; and a bean-carrying group is assembled on the grinding bean group, and is used to drive the grinding bean group to grind the coffee bean, which comprises a rotating shaft portion and a feeding trough And a guide rod, the rotating shaft portion is hollow cylindrical shape, and is sleeved on the shaft of the grinding bean group The receiving trough is an accommodating space having an upper opening shape to fill the coffee beans, and a dropping port connecting the hollow portion of the rotating shaft portion is formed under the feeding trough, and is fixed under the feeding trough. A guide rod extending axially of the drop opening, the guide rod is sleeved with a spring, and the spring is locked by two protrusions protruding in the radial direction.

In an embodiment of the invention, a pad body is disposed on the bottom side of the fixed disk body.

In an embodiment of the invention, at least one perforation is provided around the fixed disc body for the screwing member to directly fix the fixing disc body to the platform through the through hole.

In an embodiment of the invention, the upper end of the strut has a first planar portion, and the shaft has a second planar portion, and a bent portion is formed at the bottom end, and the bent portion is provided with a screw hole.

In an embodiment of the present invention, the upper base is provided with a constant hole, and a screw hole is arranged on one side of the through hole for a first bolt to be screwed and abuts against the strut, and the strut is worn In the through hole, a screw hole is provided in the bending portion for screwing a third bolt, and the first bolt is threaded through the screw hole of the upper base, and the top is abutted against the pole Two planes.

In an embodiment of the invention, the bending section further covers a 掣 clip, the 掣 clip has a through hole for the struts to pass through, so that the third bolt is screwed on the bend The screw hole of the segment is pressed against the bottom of the ㄇ clip.

In one embodiment of the present invention, one end of the base body is provided with a blind hole for the sleeve to be placed on the support rod, a screw hole transversely extending through the blind hole, and a lock is disposed on the screw hole and is tightly supported on the support hole. The second bolt of the rod has a first flat portion at the upper end of the strut, so that the second bolt is screwed to the screw hole of the seat body and abuts against the first flat portion.

In one embodiment of the present invention, the grindstone group further has a thickness adjusting portion pivotally mounted on the base body, and has a pushing plate, a spring, and an adjusting screw disposed on the pushing plate and the spring. One end of the pushing plate is in contact with the bottom side of the polishing head, and when the adjusting screw is locked or loosened, the gap between the polishing head and the grinding ring is adjusted in conjunction with each other.

In an embodiment of the invention, the outer circumference of the rotating shaft portion has a ring groove for embedding a buckle.

In an embodiment of the present invention, one end of the Shengdou hand crank set is provided with a rotating handle.

The object of the present invention and its structural and functional advantages will be explained in conjunction with the specific embodiments according to the structure shown in the following drawings, so that the reviewing committee can have a more in-depth and specific understanding of the present invention.

Referring to the first to fourth figures, a hand-cranked coffee grinder according to the present invention comprises a fixed seat set (1) for fixing a hand-cranked coffee grinder to a platform, which comprises an upper base. a seat (11) and a strut (12); the upper base (11) is formed in a frame shape, and integrally extends at the front end to form a fixed disc body (111), and a perforation is arranged around the fixed disc body (111) ( 112), the upper base (11) is provided with a through hole (113) penetrating through the frame, and a screw hole (114) is provided on the frame on the side opposite to the through hole (113) for a first bolt ( 115) screwing, further comprising a pad body (116) on a bottom side of the fixed disc body (111); the strut (12) is threaded through the through hole (113) of the upper base (11), The upper end of the strut (12) has a first flat portion (121), the second flat portion (122) is formed on the shaft body, and a bent portion (123) is formed at the bottom end, and the bent portion (123) is provided with a screw a hole (124), and a 掣-shaped clamping piece (125) having a through hole (126), the through hole (126) is sleeved on the struts (12) and the rear cover is covered by the bending section (123) a third bolt (127) is screwed to the screw hole (124) and abuts against the bottom side of the jaw-shaped clamping piece (125);

A grind bean group (2) is fixed on the strut (12) of the fixing seat group (1), and comprises a body (21) and a grinder base fixed to the seat body (21) ( 22) and a thickness adjusting portion (23), and a tapered grinding head (24), an annular grinding ring (25), and a bearing (26), which are sequentially assembled to the grinder base (22); The seat body (21) is fixed to the struts (12) of the fixed seat set (1). Preferably, one end of the seat body (21) is provided with a sleeve for being placed on the struts (12). a hole (211), a screw hole (212) transversely extending through the blind hole (211), and a first flat portion (121) locked to the screw hole (212) and tightened against the strut (12) a second bolt (213); the grinder base (22) is a columnar body corresponding to and fixed to the seat body (21), and has a pin member at the center of the grinder base (22) 221), the center hole (241) of the polishing head (24) is inserted, and the first class edge (222) and the second class edge (223) are disposed inside the grinding bean base (22). a class edge (222) for arranging the annular grinding ring (25), the second class edge (223) for the bearing (26); the thickness adjusting portion (23) having a span and pivoting The seat (21) Pushing the clamping plate (231), one end of the pushing plate (231) is abutting against the bottom side of the polishing head (24), and the other end is provided with a pushing plate (231) and a spring (233). Adjusting the screw (232), such that when the adjusting screw (232) is tightened or loosened, the end of the pushing plate (231) that abuts against the grinding head (24) is moved up or down, thereby Reducing or enlarging the gap between the polishing head (24) and the grinding ring (25) to adjust the thickness of the ground coffee powder particles;

a bean-carrying group (3), which is coupled to and drives the grinding bean group (2) for grinding coffee beans, comprising a rotating shaft portion (31), a feeding trough (32), a guiding rod (33), and a rotating handle (34); the rotating shaft portion (31) has a hollow cylindrical shape, and has an annular groove (311) on the outer circumference of the rotating shaft portion (31), and the annular groove (311) is configured to embed a buckle (312). The feeding trough (32) is a large and downwardly accommodating accommodating space above the opening to hold the coffee beans to be ground, and a hollow portion connecting the rotating shaft portion (31) is formed under the feeding trough (32). The drop opening (321) is fixed under the feeding trough (32) to a guide rod (33) extending axially from the unloading opening (321), and the guiding rod (33) is sleeved with a spring (332). And locking the spring (332) with two protrusions (331) protruding in a radial direction, so that when the rotating shaft portion (31) is placed through the bearing (26) of the grinding bean group (2) The protrusion (331) of the guiding rod (33) is located at the notch (242) of the polishing head (24), and at the same time, the spring (332) provides the grinding head (24) with a downward pushing force, which is repeated One end of the Bean Hand Group (3) is provided with a rotating handle (34).

Thereby, the hand coffee coffee grinder of the present invention can be placed on the table (A) by the fixed disk body (111) of the upper base (11), and directly locked to the table through the through hole (112) by the screwing member (A). ), or, the above base (11) and the bent section (123) of the strut (12) can be fixed to the edge of the table or other objects in a manner of being matched with the clip-shaped clips (125), so that the user can Rotating the coffee beans with one hand by turning the handle (34) smoothly does not require the user to stabilize with the other hand.

In addition, the scope of the invention may be further exemplified by the following specific examples, which are not intended to limit the scope of the invention.

Referring to FIG. 5 together, the assembly process of each component will be described first. In this embodiment, the struts (12) respectively pass through the through holes (126) and the upper base of the cymbal clamp (125). The through hole (113) of the frame (11) is such that the fixed disk body (111) of the upper base (11) and the jaw-shaped clamping piece (125) are clamped to the edge of the table (A), so that the first bolt ( 115) The screw hole (114) penetrating the frame of the upper base (11) is locked against the second planar portion (122) of the strut (12), and then screwed into the screw hole (124) of the strut (12) The third bolt (127) causes the jaw-shaped clamping piece (125) to rise and is more tightly clamped to the edge of the table (A), and then the thickness adjusting portion (23) of the grinding bean group (2) Pivoted on the base body (21), the grinding head (24) is sleeved on the pin (221) of the center of the grinder base (22) with a center hole (241), and the grinding ring (25), The bearing (26) is respectively fixed in the corresponding first class edge (222) and the second class edge (223) of the grinder base (22), and the grinding bean group (2) is continued as a seat body (21). The blind hole (211) is sleeved on the strut (12), and the second bolt (213) is locked to the first of the strut (12) through the screw hole (212) of the seat body (21) Flat section (121), finally, will The rotating shaft portion (31) of the Bean Hand Group (3) is placed in the bearing (26) of the grinding bean group (2), and at the same time, the guiding rod of the Bean Hand Group (3) ( 33) The bump (331) is located in the notch (242) of the polishing head (24), and the spring (332) also opposes the polishing head (24), so that it can be used as a bean shake group ( 3) When the rotation is performed, the polishing head (24) is rotated by the bumps (331) of the guide rod (33). Preferably, the bottom side of the fixed disk body (111) is further provided with a pad body (116), which not only provides a non-slip function with the table (A), but also has a shock absorbing effect during grinding. When the rotating shaft portion (31) is sleeved on the bearing (26), a buckle (312) is embedded in the annular groove (311) of the rotating shaft portion (31), and is locked in the ring Below the bearing (26).

After the assembly is fixed, the container for receiving the coffee powder can be placed on the fixed tray body (111), and the user puts the appropriate amount of coffee beans into the feeding trough (32) of the Bean Hand Group (3), and the coffee beans pass. The feeding port (321) of the feeding trough (32) is all the way to the position between the grinding head (24) of the grinding bean group (2) and the grinding ring (25), and the user starts to rotate the rotating handle (34), and is solid. The guide rod (33) connected to the feeding groove (32) also rotates, and the guiding rod (33) drives the polishing head (24) to rotate relative to the grinding ring (25) by the protrusion (331). When the grinding head (24) is actuated, the coffee beans will start to roll around the grinding head. The grinding teeth outside the grinding head (24) and the grinding teeth on the inner side of the grinding ring (25) will grind the coffee beans and become granular coffee powder. The container directly falling onto the fixed disk body (111); while the polishing head (24), the grinding ring (25), the bearing (26), and the rotating shaft portion (31) of the present invention are all held in the pin member (221) and the guide There is no eccentricity on the central axis of the rod (33), so that the overall rotation is relatively constant and the ground coffee powder can maintain a uniform particle size.

If you are not satisfied with the particle size of the coffee powder, you can adjust it from the thickness adjustment part (23) of the grinder group (2). The top push plate (231) of the thickness adjustment part (23) and the bottom side of the grinding head (24). Plane contact, therefore, when the adjusting screw (232) is locked, the adjusting screw (232) will press the spring (233) and the pushing plate (231), and the other end of the pushing plate (231) will push the grinding head The bottom side of (24) reduces the gap between the grinding head (24) and the grinding ring (25), limiting the particle size of the passing coffee powder to obtain a smaller, finer coffee powder, as shown in Figure 5. In other words, when the adjusting screw (232) is rotated, the spring (233) pushes up the end of the adjusting screw (232) of the pushing plate (231), and the opposite end of the pushing plate (231) is lowered, so that the grinding is performed. The head (24) is synchronously lowered by the spring (332) of the guide rod (33), and the gap between the grinding head (24) and the grinding ring (25) is enlarged to obtain a coffee powder having a larger abrasive particle.

It can be seen from the above description that the present invention has the following advantages compared with the prior art:

1. When the invention is used, the hand-cranked coffee grinder is firmly fixed on the table, so that the user can grind the coffee powder with only one hand, thereby eliminating the need for an extra stable grinder in the past, and The Shengdou hand-cranked set is placed on the bearing to run, even for less powerful users, the coffee powder can be easily and effortlessly ground.

2. The grinding head and the grinding ring of the hand-operated coffee grinder of the present invention are kept at the same central axis, and there is no eccentricity when the coffee beans are ground, so that the particle size of the coffee powder can be relatively uniform and also improved. The overall mechanical strength of the hand-cranked coffee grinder.

3. The hand-operated coffee grinder of the present invention adopts straight-drop powder, and the thickness of the ground coffee powder after the grinding can be visually observed at the initial stage of grinding, thereby directly adjusting the thickness of the desired coffee powder particles.

In summary, the hand-cranked coffee grinder of the present invention can achieve the intended use efficiency by the above-disclosed embodiments, and the present invention has not been disclosed before the application, and has completely complied with the patent law. Regulations and requirements.爰Issuing an application for a patent for invention in accordance with the law, and asking for a review, and granting a patent, is truly sensible.

The illustrations and descriptions of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; those skilled in the art, which are characterized by the scope of the present invention, Equivalent variations or modifications are considered to be within the scope of the design of the invention.

(1) ‧ ‧ fixed seat
(11) ‧ ‧ pedestal

(111)‧‧‧ Fixed disk
(112)‧‧‧Perforation

(113)‧‧‧Tongkong
(114)‧‧‧ screw holes

(115)‧‧‧First bolt
(116)‧‧‧

(12)‧‧‧ poles
(121) ‧‧‧ First Plane

(122)‧‧‧The second plane
(123) ‧‧‧Bend section

(124)‧‧‧ screw holes
(125) ‧‧‧ㄇ clips

(126)‧‧‧through holes
(127) ‧‧‧ Third bolt

(2)‧‧‧ Grinding beans group
(21) ‧ ‧ ‧ body

(211) ‧ ‧ blind holes
(212) ‧‧‧ screw holes

(213)‧‧‧Second bolt
(22)‧‧‧ Grinding pedestal

(221)‧‧‧ Pins
(222) ‧‧‧First class

(223) ‧‧‧Second class
(23) ‧ ‧ thickness adjustment department

(231)‧‧‧Pushing splint
(232)‧‧‧Adjustment screws

(233) ‧ ‧ spring
(24)‧‧‧ polishing head

(241)‧‧‧ center hole
(242) ‧‧‧ gap

(25)‧‧‧ grinding rings
(26) ‧ ‧ bearing

(3) ‧‧‧ Shengdou Hand Group
(31)‧‧‧Rotary shaft

(311) ‧ ‧ Circumference
(312)‧‧‧ buckle

(32)‧‧‧ Feeding trough
(321)‧‧‧Drops

(33) ‧ ‧ guides
(331)‧‧‧Bumps

(332) ‧ ‧ spring
(34) ‧ ‧ shank

(A) ‧ ‧ table

First Figure: An exploded view of a preferred embodiment of the present invention.

Second Figure: A partially exploded enlarged view of a preferred embodiment of the present invention.

Third Figure: An overall combination of preferred embodiments of the present invention.

Figure 4 is a cross-sectional view showing an embodiment of the preferred embodiment of the present invention.

Fifth Figure: Schematic diagram of the thickness adjustment of the preferred embodiment of the present invention.

(1) ‧ ‧ fixed seat

(11) ‧ ‧ pedestal

(111)‧‧‧ Fixed disk

(112)‧‧‧Perforation

(113)‧‧‧Tongkong

(114)‧‧‧ screw holes

(115)‧‧‧First bolt

(116)‧‧‧

(12)‧‧‧ poles

(121) ‧‧‧ First Plane

(122)‧‧‧The second plane

(123)‧‧‧Bend section

(124)‧‧‧ screw holes

(125)‧‧‧ㄇ clips

(126)‧‧‧through holes

(127)‧‧‧ Third bolt

(2)‧‧‧ Grinding beans group

(21) ‧ ‧ ‧ body

(211) ‧ ‧ blind holes

(212)‧‧‧ screw holes

(213)‧‧‧Second bolt

(22)‧‧‧ Grinding pedestal

(221)‧‧‧ Pins

(23) ‧ ‧ thickness adjustment department

(24)‧‧‧ polishing head

(25)‧‧‧ grinding rings

(26) ‧ ‧ bearing

(3) ‧‧‧ Shengdou Hand Group

(31)‧‧‧Rotary shaft

(311) ‧ ‧ Circumference

(312)‧‧‧ buckle

(32)‧‧‧ Feeding trough

(33) ‧ ‧ guides

(331)‧‧‧Bumps

(332) ‧ ‧ spring

(34) ‧ ‧ shank

Claims (10)

A hand-cranked coffee grinder includes: a fixed base set, comprising an upper base and a strut, the front end of the upper base extending to form a fixed disc body for fixing on a platform, The struts are connected to one end of the upper base; a grinding bean set includes a seat body fixed to the struts, a grinder base fixed to the base body, and sequentially assembled to the grinder a grinding head, a grinding ring and a bearing, the grinding bean base is two corresponding cylindrical bodies fixed to the seat body, and a pin member is arranged at the center of the grinding bean base to wear the sleeve a center hole of the grinding head, and a first class edge and a second class edge disposed on the inner side of the grinding bean base, the first class edge is for the grinding ring, the second class edge is for the bearing; The Bean Hand Group is connected to the grinding bean group and is used to drive the grinding bean group to grind the coffee beans, comprising a rotating shaft portion, a feeding trough, and a guiding rod, wherein the rotating shaft portion is a hollow cylinder Formed in the bearing of the grinder group, the feed trough is open at the top to fill the coffee beans a space is formed below the feeding trough to form a blanking port connecting the hollow portion of the rotating shaft portion, and a guiding rod extending axially to the blanking port is fixed under the feeding trough, the guiding rod is sleeved with a spring And locking the spring with two protrusions protruding in the radial direction. The hand-cranked coffee grinder according to claim 1, wherein a pad body is disposed on a bottom side of the fixed plate body. The hand-cranked coffee grinder according to claim 1 or 2, wherein at least one perforation is provided around the fixed disc body, so that the screwing member directly locks the fixing disc body to the platform through the perforation. . The hand-cranked coffee grinder according to claim 1, wherein the upper base is provided with a constant hole, and a screw hole is arranged on one side of the through hole for a first bolt to be screwed and abutted against the support The rod is further disposed in the through hole, and a bent portion is formed at a bottom end of the stay, and the bent portion is provided with a screw hole for a third bolt to be screwed. The hand-cranked coffee grinder according to claim 4, wherein the shaft of the strut has a second flat portion, and the first bolt is threaded through the screw hole of the upper base, and the top is abutted a second planar portion of the strut. The hand-cranked coffee grinder according to claim 4, wherein the bending section further covers a 掣-shaped clamping piece, the 掣-shaped clamping piece having a through hole for the struts to pass through The third bolt screw is disposed on the screw hole of the bending section and is pressed against the bottom of the 掣 clip. The hand-cranked coffee grinder according to claim 1, wherein one end of the body is provided with a blind hole for the sleeve, a screw hole transversely extending through the blind hole, and a lock. The second bolt of the screw hole and the top of the strut has a first flat portion at the upper end of the strut, so that the second bolt is screwed to the screw hole of the seat body and abuts against the first flat portion. The hand-cranked coffee grinder according to claim 1, wherein the grindstone group further has a thickness adjustment portion pivotally mounted on the base body, and has a push-ply plate, a spring, and a threaded Pushing the clamping plate and the adjusting screw of the spring, the one end of the pushing plate is in contact with the bottom side of the polishing head, and when the adjusting screw is locked or loosened, the gap between the polishing head and the grinding ring is adjusted in conjunction with each other. The hand-cranked coffee grinder according to claim 1, wherein the outer circumference of the rotating shaft portion has a ring groove for embedding a buckle. The hand-cranked coffee grinder according to claim 1, wherein the one-handed hand-cranked set has a rotating handle at one end.