CN219422665U - Anti-loosening cup body structure of stirrer - Google Patents

Abstract

The utility model discloses an anti-loosening cup body structure of a stirrer, which comprises a stirring cup and a cutter holder which are detachably connected; wherein, the knife rest is provided with a locking mechanism for locking the stirring cup on the knife rest; the locking mechanism comprises a locking piece which can move close to or away from the stirring cup, and the stirring cup is provided with a locking matching piece which is matched and locked with the locking piece correspondingly. According to the utility model, the stirring cup is locked on the tool apron through the matching of the locking piece and the locking matching piece, the stirring cup moves along the unscrewing direction relative to the tool apron, the locking and unlocking processes of the stirring cup are convenient and quick, and the operation is very simple.

Description

Anti-loosening cup body structure of stirrer

Technical Field

The utility model relates to the technical field of mixers, in particular to an anti-loosening cup body structure of a mixer.

Background

In order to ensure the use safety, the stirrer on the market is provided with a structure that the tool apron and the cup body are integrated and are not detachable, but after the structure is used, the inside of the cup body is difficult to clean, bacteria are easy to breed, the stirrer is unhygienic, and hands are easy to scratch in the cleaning process; then, for cleaning convenience, the tool apron and the cup body are in a detachable structure, in the structure, the tool apron and the cup body are connected in a threaded connection mode, but when the device is used, the motor in the stirrer rotates at a high speed, the vibration of the device is large, the working strength is high, the connection between the cup body and the tool apron is easy to loosen, the connection is unreliable, the use is unsafe, and even the whole device is likely to fail in work. In order to ensure the use safety of the stirrer with the detachable structure of the cutter holder and the cup body, the conventional stirrer usually has a plurality of fixing devices which are used for fixing the cutter holder and the cup body, and the cutter holder is usually too large in size to influence the user experience.

Disclosure of Invention

First, the technical problem to be solved

The utility model aims to solve the technical problem of providing an anti-loosening cup body structure of a stirrer, which ensures that a stirring cup is locked on a tool apron through the cooperation of a locking piece and a locking matching piece, the stirring cup moves along the unscrewing direction relative to the tool apron, and the locking and unlocking processes of the stirring cup are convenient and quick, and the operation is very simple.

(II) technical scheme

The utility model solves the technical problems by adopting the scheme that the anti-loosening cup body structure of the stirrer comprises a stirring cup and a tool apron which are detachably connected; wherein, the knife rest is provided with a locking mechanism for locking the stirring cup on the knife rest; the locking mechanism comprises a locking piece which can move close to or away from the stirring cup, and the stirring cup is provided with a locking matching piece which is matched and locked with the locking piece correspondingly.

Specifically, a blade assembly for processing food is arranged in the tool apron, the lower end of the blade assembly is connected with a motor, and the blade assembly is driven by the motor to perform high-speed rotary motion so as to process the food; the lower end of the stirring cup is provided with an opening, so that the blade assembly can extend into the stirring cup to treat food; the top end of the stirring cup is provided with the cover body, so that food in the stirring cup is prevented from splashing when the stirring machine is in operation, and the stirring cup is more sanitary; the handle part is arranged on the outer wall of the stirring cup, so that the operation of a user is facilitated; the periphery that is located in the blade holder is provided with the sealing member to guarantee the leakproofness of blade holder, prevent in the seepage to the motor, in order to ensure the safety in utilization.

By adopting the scheme, the stirring cup is locked on the tool apron through the matching of the locking piece and the locking matching piece, the stirring cup moves along the unscrewing direction relative to the tool apron, the locking and unlocking processes of the stirring cup are convenient and quick, and the operation is very simple.

Further, the locking piece is arranged on the inner wall of the tool apron and can move up and down along the inner wall; correspondingly, the locking matching piece is arranged on the outer wall of the stirring cup.

Specifically, when the locking piece rises to the position where the locking piece is locked on the locking matching piece along the inner wall, the stirring cup and the tool apron are locked, so that the stirring cup is limited to move along the unscrewing direction relative to the tool apron, the stirring cup and the tool apron are prevented from being separated, and the use safety is ensured; when the locking piece descends to be separated from the locking matching piece along the inner wall, the stirring cup and the tool apron are unlocked, and the stirring cup can move relative to the tool apron along the unscrewing direction, so that separation between the stirring cup and the tool apron is realized, and cleaning is facilitated.

Further, the top end portion of the locking piece protrudes upwards to form a locking buckle portion, and correspondingly, the locking matching piece comprises a locking buckle groove matched with the locking buckle portion.

Further, the outer wall of the stirring cup is provided with a plurality of protruding parts which are arranged at intervals, and one locking buckle groove is formed between any two protruding parts.

Specifically, the locking buckle part is formed at the center of the top end of the locking piece, and when the locking buckle part is locked in the locking buckle groove, the top end of the locking piece is positioned at the two ends of the locking buckle part and abuts against the lower end of the protruding part, so that locking stability is ensured.

Further, the locking matching piece is connected to the outer wall of the stirring cup in a buckling connection mode, wherein a plurality of protruding portions which are arranged at intervals are arranged on the outer wall of the locking matching piece, and a locking buckling groove is formed between any two protruding portions.

Preferably, the outer wall of the stirring cup is provided with a plurality of protruding buckling parts protruding outwards, and correspondingly, the locking matching piece is provided with a buckling hole for adapting to the protruding buckling parts, and the locking matching piece is positioned at the top of the buckling hole and is provided with an elastic buckling part for limiting the separation of the stirring cup.

Further, the locking mechanism includes a driving member for driving the locking member out of engagement with the locking mating member, and a return member for always applying a force to the locking member in a direction toward the stirring cup.

Preferably, the return member comprises a compression spring.

Specifically, when the driving member is operated to act on the locking member, the locking member moves downwards along the inner wall of the tool apron, so that the locking member is separated from the locking matching member, and unlocking between the stirring cup and the tool apron is realized, and at the moment, the reset member is stressed to be in a compressed state; when the driving piece is loosened, the resilience force of the reset piece drives the locking piece to do ascending motion along the inner wall of the tool apron, so that the locking piece is locked with the locking matching piece, and the locking between the stirring cup and the tool apron is realized.

Further, the driving piece is arranged on the tool apron and can do radial reciprocating translational motion along the tool apron, wherein one side of the driving piece, which is positioned in the tool apron, is provided with a driving part with radial protrusions, and the driving part comprises a guiding inclined plane which is formed at the bottom of the driving part and is obliquely arranged from bottom to top; correspondingly, the locking piece is provided with a slot matched with the driving part, and the slot comprises a matched inclined plane which is obliquely arranged from bottom to top and matched with the guide inclined plane.

Specifically, when the driving piece is operated, the driving piece is forced to translate inwards, and the locking piece moves downwards due to the cooperation of the guide inclined plane and the cooperation inclined plane, so that the locking piece is separated from the locking cooperation piece, and unlocking between the stirring cup and the tool apron is realized; when the driving piece is loosened, the return force of the reset piece drives the locking piece to move upwards, and the upward movement of the locking piece drives the driving piece to move outwards for reset due to the cooperation of the guide inclined surface and the cooperation inclined surface.

Further, the tool apron is provided with an opening part for adapting to the driving piece, and the tool apron is positioned at the opening part and is provided with a guide groove for guiding the driving piece, and correspondingly, the driving piece is provided with a convex strip adapted to the guide groove.

Preferably, the guide grooves are arranged on the side walls of the two ends of the opening part and radially penetrate through the guide grooves; the cooperation of the guide groove and the raised strips ensures that the driving piece always performs radial translational motion, thereby ensuring the radial reciprocating translational motion of the driving piece and driving the axial lifting motion of the locking piece.

Further, the locking mechanism further comprises a fixing piece which is fixedly connected with the tool apron and is arranged at the inner side of the locking piece relatively, and the locking piece can move up and down relatively to the fixing piece; the fixing piece comprises a through hole which is vertically penetrated, the locking piece comprises a positioning shaft which is always matched in the through hole, the positioning shaft can vertically move along the through hole, the axial lifting movement of the locking piece is further ensured, and the structure is more stable; the resetting piece is sleeved on the positioning shaft and is limited between the locking piece and the fixing piece.

Preferably, the fixing member is detachably mounted on the tool holder by a screw.

Preferably, the locking piece comprises a locking main body part matched with the driving piece, a sliding part formed by upward protrusion of the top end part of the locking main body part, a locking buckle part formed by upward protrusion of the top end part of the sliding part, two extending walls formed by overextension of two sides of the locking main body part near the top end of the locking main body part, and two positioning shafts arranged at the lower ends of the two extending walls; the fixing member is provided with an adaptation groove for adapting the locking member.

Further, an installation groove for installing the stirring cup is formed in the open top end of the tool apron, and an inner thread is formed in the inner wall of the installation groove; correspondingly, the outer wall of the stirring cup or the outer wall of the locking matching piece is provided with an external thread in threaded fit with the internal thread.

Preferably, the internal thread and the external thread are both break-off threads.

The lower end of the stirring cup is provided with a matching part matched with the mounting groove, and the matching part is provided with the external thread;

and two,: the outer wall of the locking fitting is provided with the external thread.

Further, the inner wall of the mounting groove is provided with a sliding groove which is disconnected with the internal thread and is penetrated up and down, and the locking piece can move up and down along the sliding groove.

Preferably, the sliding part of the locking piece is adapted to move up and down in the sliding groove.

(III) beneficial effects

Compared with the prior art, the utility model designs an anti-loosening cup body structure of a stirrer,

(1) According to the utility model, the stirring cup is locked on the tool apron through the matching of the locking piece and the locking matching piece, the stirring cup moves along the unscrewing direction relative to the tool apron, the locking and unlocking processes of the stirring cup are convenient and quick, and the operation is very simple;

(2) According to the utility model, the guiding inclined plane of the driving piece is matched with the matching inclined plane of the locking piece, so that the locking piece can be locked or unlocked in the tool apron through lifting movement;

(3) According to the utility model, the guide groove is matched with the convex strip, so that the driving piece is always in radial translational motion, and radial reciprocating translational motion of the driving piece is ensured, and the axial lifting motion of the locking piece can be driven.

Drawings

FIG. 1 is an exploded view of an anti-loosening cup structure of a blender in accordance with a first embodiment;

FIG. 2 is a partial exploded view of an anti-loosening cup structure of a blender in accordance with the first embodiment;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is a partial view of an anti-loosening cup structure of a blender in accordance with the first embodiment;

FIG. 5 is an enlarged schematic view of FIG. 4 at B;

FIG. 6 is a schematic view of a tool holder according to a first embodiment;

FIG. 7 is an exploded view of the locking mechanism of the first embodiment;

FIG. 8 is another angular exploded view of the locking mechanism of the first embodiment;

FIG. 9 is an exploded view of an anti-loosening cup structure of a blender in accordance with the second embodiment;

fig. 10 is an enlarged schematic view at C in fig. 9.

Reference numerals illustrate: 1. a stirring cup; 11. a locking fitting; 111. locking the buckle groove; 112. a snap hole; 113. an elastic buckle part; 12. a boss; 13. a mating portion; 131. an external thread; 14. a cover body; 15. a handle portion; 16. a convex buckling part; 2. a tool apron; 21. an opening portion; 22. a guide groove; 23. a mounting groove; 231. an internal thread; 232. a sliding groove; 3. a locking mechanism; 31. a locking member; 311. locking the buckle part; 312. slotting; 312-1, mating with the bevel; 313. positioning a shaft; 314. a locking body portion; 315. a sliding part; 316. an extension wall; 32. a driving member; 321. a driving section; 321-1, a guiding inclined plane; 322. a convex strip; 33. a reset member; 34. a fixing member; 341. perforating; 342. an adaptation groove; 4. a blade assembly; 5. and a seal.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model but are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Embodiment one:

as shown in fig. 1 to 8, an anti-loosening cup structure of a stirrer of the embodiment comprises a stirring cup 1 and a tool apron 2 which are detachably connected; wherein, the tool apron 2 is provided with a locking mechanism 3 for locking the stirring cup 1 on the tool apron 2; the locking mechanism 3 comprises a locking piece 31 capable of moving towards or away from the stirring cup 1, and the stirring cup 1 is correspondingly provided with a locking matching piece 11 matched and locked with the locking piece 31. Specifically, a blade assembly 4 for processing food is arranged in the tool apron 2, the lower end of the blade assembly 4 is connected with a motor, and the blade assembly 4 is driven by the motor to perform high-speed rotation so as to process the food; the lower end of the stirring cup 1 is provided with an opening, so that the blade assembly 4 can extend into the stirring cup 1 to process food; the top end of the stirring cup 1 is provided with the cover body 14, so that food in the stirring cup 1 is prevented from splashing when the stirring machine is in operation, and the stirring cup is more sanitary; the outer wall of the stirring cup 1 is provided with a handle part 15, so that the operation of a user is facilitated; wherein, the circumference that lies in the blade holder 2 blade subassembly 4 is provided with sealing member 5 to guarantee the leakproofness of blade holder 2, prevent the seepage to in the motor, in order to ensure the safety in utilization. By adopting the scheme, through the cooperation of the locking piece 31 and the locking cooperation piece 11, the stirring cup 1 is locked on the tool apron 2, the stirring cup 1 moves along the unscrewed direction relative to the tool apron 2 now, and the locking and unlocking processes of the stirring cup 1 are convenient and quick, and the operation is very simple.

As shown in fig. 4-5, further, the locking member 31 is disposed on the inner wall of the tool holder 2, and can move up and down along the inner wall; correspondingly, the locking matching piece 11 is arranged on the outer wall of the stirring cup 1. Specifically, when the locking member 31 is lifted along the inner wall to be locked on the locking mating member 11, the stirring cup 1 and the tool holder 2 are locked, so as to limit the stirring cup 1 to move along the unscrewing direction relative to the tool holder 2, prevent the stirring cup 1 from being separated from the tool holder 2, and ensure the use safety; when the locking member 31 descends along the inner wall to be separated from the locking mating member 11, the stirring cup 1 and the tool holder 2 are unlocked, and the stirring cup 1 can move along the unscrewing direction relative to the tool holder 2, so that separation between the stirring cup 1 and the tool holder 2 is realized, and cleaning is facilitated. Further, the top end portion of the locking member 31 protrudes upward to form a locking buckle portion 311, and the locking mating member 11 includes a locking buckle groove 111 adapted to the locking buckle portion. Further, the outer wall of the stirring cup 1 is provided with a plurality of protruding parts 12 arranged at intervals, and one locking and buckling groove 111 is formed between any two protruding parts 12. Specifically, the locking buckle portion 311 is formed at the center of the top end of the locking member 31, and when the locking buckle portion 311 is locked in the locking buckle groove 111, the top end of the locking member 31 is positioned at the lower end of the protruding portion 12 where both ends of the locking buckle portion 311 abut to ensure locking stability.

As shown in fig. 4-5 and fig. 7-8, further, the locking mechanism 3 comprises a driving member 32 for driving the locking member 31 out of the locking engagement member 11, and a reset member 33 for always applying a force to the locking member 31 in a direction approaching the stirring cup 1. Preferably, the return member 33 comprises a compression spring. Specifically, when the driving member 32 is operated to act on the locking member 31, the locking member 31 moves downward along the inner wall of the tool holder 2, so that the locking member 31 is separated from the locking mating member 11, and the stirring cup 1 and the tool holder 2 are unlocked, and at this time, the resetting member 33 is under compression; when the driving member 32 is released, the elastic force of the reset member 33 drives the locking member 31 to move upward along the inner wall of the tool holder 2, so that the locking member 31 is locked to the locking mating member 11, thereby locking the stirring cup 1 and the tool holder 2. Further, the driving member 32 is disposed on the tool holder 2 and can perform a radial reciprocating translational motion along the tool holder 2, wherein a radially protruding driving portion 321 is disposed on a side of the driving member 32 located in the tool holder 2, and the driving portion 321 includes a guiding inclined surface 321-1 formed at a bottom thereof and arranged obliquely from bottom to top; correspondingly, the locking member 31 is provided with a slot 312 adapted to the driving portion 321, and the slot 312 includes a mating inclined surface 312-1 which is inclined from bottom to top and adapted to the guiding inclined surface 321-1. Specifically, when the driving member 32 is operated, the driving member 32 is forced to translate inwards, so that the locking member 31 moves downwards due to the cooperation of the guiding inclined surface 321-1 and the cooperation inclined surface 312-1, and is separated from the locking cooperation member 11, so as to unlock between the stirring cup 1 and the tool holder 2; when the driving member 32 is released, the restoring force of the restoring member 33 drives the locking member 31 to move upward, and the upward movement of the locking member 31 drives the driving member 32 to move outward for restoring due to the engagement of the guide slope 321-1 and the engagement slope 312-1. Further, the tool holder 2 is provided with an opening 21 for adapting to the driving member 32, and the tool holder 2 is located at the opening 21 and provided with a guiding slot 22 for guiding the driving member 32, and correspondingly, the driving member 32 is provided with a protruding strip 322 adapted to the guiding slot 22. Preferably, the guide grooves 22 are formed on both side walls of the opening 21 and radially penetrate through the same; the cooperation of the guide groove 22 and the convex strip 322 makes the driving member 32 perform radial translational motion all the time, so as to ensure the radial reciprocating translational motion of the driving member 32, and can drive the axial lifting motion of the locking member 31. Further, the locking mechanism 3 further includes a fixing member 34 fixedly connected to the tool holder 2 and disposed opposite to the inner side of the locking member 31, and the locking member 31 may move up and down relative to the fixing member 34; the fixing member 34 includes a through hole 341 penetrating up and down, and correspondingly, the locking member 31 includes a positioning shaft 313 always matched in the through hole 341, and the positioning shaft 313 can perform up-down lifting motion along the through hole 341, so as to further ensure axial lifting motion of the locking member 31, and the structure is more stable; the restoring member 33 is sleeved on the positioning shaft 313 and is limited between the locking member 31 and the fixing member 34. Preferably, the fixing member 34 is detachably mounted on the tool holder 2 by means of screws. Preferably, the locking member 31 includes a locking body part 314 engaged with the driving member 32, a sliding part 315 formed by upwardly projecting a top end portion of the locking body part 314, a locking catching part 311 formed by upwardly projecting a top end portion of the sliding part 315, two extension walls 316 formed by upwardly extending both sides of the locking body part 314 near the top ends thereof, and two positioning shafts 313 provided at lower ends of the two extension walls 316; the fixing member 34 is provided with an adaptation groove 342 for adapting the locking member 31.

As shown in fig. 1 and fig. 4-6, further, a mounting groove 23 for mounting the stirring cup 1 is formed on the top end of the tool holder 2 in an open manner, and an inner wall of the mounting groove 23 is provided with an inner thread 231; correspondingly, a matching part 13 matched with the mounting groove 23 is arranged at the lower end of the stirring cup 1, and an external thread 131 in threaded fit with the internal thread 231 is arranged on the outer wall of the matching part 13. Preferably, the internal thread 231 and the external thread 131 are both break-off threads. Further, a sliding groove 232 is provided on the inner wall of the mounting groove 23 to disconnect the internal thread 231 and vertically penetrate, and the locking member 31 can move up and down along the sliding groove 232. Preferably, the sliding portion 315 of the locking member 31 is adapted to move up and down in the sliding groove 232.

Embodiment two:

the difference between this embodiment and the first embodiment is that:

as shown in fig. 9-10, in this embodiment, the locking mating member 11 is connected to the outer wall of the stirring cup 1 by a snap connection manner, where a plurality of protruding portions 12 arranged at intervals are disposed on the outer wall of the locking mating member 11, and one locking snap groove 111 is formed between any two protruding portions 12, and an external thread 131 adapted to the internal thread 231 is further disposed on the outer wall of the locking mating member 11. Preferably, the outer wall of the stirring cup 1 is provided with a plurality of protruding buckling parts 16 protruding outwards, correspondingly, the locking matching piece 11 is provided with buckling holes 112 for adapting to the protruding buckling parts 16, and the locking matching piece 11 is positioned at the top of the buckling holes 112 and is provided with elastic buckling parts 113 for limiting the separation of the stirring cup 1.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (10)

1. An anti-loosening cup body structure of a stirrer, which is characterized in that: comprises a stirring cup (1) and a tool apron (2) which are detachably connected; wherein, the tool apron (2) is provided with a locking mechanism (3) for locking the stirring cup (1) on the tool apron (2); the locking mechanism (3) comprises a locking piece (31) which can move close to or away from the stirring cup (1), and the stirring cup (1) is provided with a locking matching piece (11) which is matched and locked with the locking piece (31).

2. The anti-loosening cup structure of a blender of claim 1, wherein: the locking piece (31) is arranged on the inner wall of the tool apron (2) and can move up and down along the inner wall; correspondingly, the locking matching piece (11) is arranged on the outer wall of the stirring cup (1).

3. The anti-loosening cup structure of a blender of claim 2, wherein: the top end part of the locking piece (31) protrudes upwards to form a locking buckle part (311), and correspondingly, the locking matching piece (11) comprises a locking buckle groove (111) matched with the locking buckle part.

4. A mixer anti-loosening cup structure as claimed in claim 3, wherein: the outer wall of the stirring cup (1) is provided with a plurality of protruding parts (12) which are arranged at intervals, and a locking buckle groove (111) is formed between any two protruding parts (12).

5. A mixer anti-loosening cup structure as claimed in claim 3, wherein: the locking matching piece (11) is connected to the outer wall of the stirring cup (1) in a buckling connection mode, wherein a plurality of protruding portions (12) which are arranged at intervals are arranged on the outer wall of the locking matching piece (11), and a locking buckling groove (111) is formed between any two protruding portions (12).

6. The anti-loosening cup structure of a blender of claim 2, wherein: the locking mechanism (3) comprises a driving member (32) for driving the locking member (31) out of the locking mating member (11), and a reset member (33) for always giving the locking member (31) a force in a direction approaching the stirring cup (1).

7. The anti-loosening cup structure of a blender of claim 6, wherein: the driving piece (32) is arranged on the tool apron (2) and can do radial reciprocating translational motion along the tool apron (2), wherein one side of the driving piece (32) positioned in the tool apron (2) is provided with a driving part (321) which is radially protruded, and the driving part (321) comprises a guiding inclined surface (321-1) which is formed at the bottom of the driving part and is obliquely arranged from bottom to top; correspondingly, the locking piece (31) is provided with a slot (312) matched with the driving part (321), and the slot (312) comprises a matching inclined surface (312-1) which is obliquely arranged from bottom to top and matched with the guiding inclined surface (321-1).

8. The anti-loosening cup structure of a blender of claim 7, wherein: the tool apron (2) is provided with an opening (21) for adapting to the driving piece (32), the tool apron (2) is positioned at the opening (21) and is provided with a guide groove (22) for guiding the driving piece (32), and correspondingly, the driving piece (32) is provided with a raised line (322) adapting to the guide groove (22).

9. The anti-loosening cup structure of a blender of claim 6, wherein: the locking mechanism (3) further comprises a fixing piece (34) fixedly connected with the tool apron (2) and oppositely arranged on the inner side of the locking piece (31), and the locking piece (31) can move up and down relative to the fixing piece (34); the fixing piece (34) comprises a through hole (341) which is vertically arranged in a penetrating mode, the locking piece (31) comprises a positioning shaft (313) which is always matched in the through hole (341), and the positioning shaft (313) can vertically move along the through hole (341); the resetting piece (33) is sleeved on the positioning shaft (313) and is limited between the locking piece (31) and the fixing piece (34).

10. The anti-loosening cup structure of a blender of claim 4 or 5, wherein: the top end of the tool apron (2) is provided with an opening to form a mounting groove (23) for mounting the stirring cup (1), and the inner wall of the mounting groove (23) is provided with an internal thread (231); correspondingly, an external thread (131) in threaded fit with the internal thread (231) is arranged on the outer wall of the stirring cup (1) or the outer wall of the locking matching piece (11); the inner wall of the mounting groove (23) is provided with a sliding groove (232) which is used for disconnecting the internal thread (231) and penetrates up and down, and the locking piece (31) can move up and down along the sliding groove (232).