CN210845256U

CN210845256U - Folding base

Info

Publication number: CN210845256U
Application number: CN201921599733.6U
Authority: CN
Inventors: 汪农茂; 杨兴华; 钟国龙
Original assignee: Hangzhou Shangchong Industrial Co ltd
Current assignee: Hangzhou Shangchong Industrial Co ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-06-26
Anticipated expiration: 2029-09-24
Also published as: TWM612953U

Abstract

The utility model relates to a folding base, which comprises a bottom plate, a support column vertically fixed on the bottom plate and a mounting plate arranged on the top of the support column; the top of the support column is connected with a rotating shaft horizontally arranged, and the rotating shaft is arranged close to the edge of the support column; the mounting plate is connected to the rotating shaft and is in rotating fit with the rotating shaft; the mounting plate is placed on the top of the support column after rotating. The utility model discloses the setting rotates the mounting panel of connection at the support column top for when not using mahjong machine, the interior mounting panel that can grab makes its one side that is located the support column, thereby reduces the shared space of mahjong machine, improves the utilization ratio of interior space.

Description

Folding base

Technical Field

The utility model belongs to the technical field of the technique of mahjong table base and specifically relates to a folding base is related to.

Background

Mahjong playing is an indispensable theme in games and leisure activities, and many people like to call friends to play a few circles of mahjong in spare time. Along with the improvement of living standard of people, more and more people purchase mahjong machines at home for entertainment.

For example, the chinese patent with application publication number CN103657083A discloses a novel multifunctional mahjong machine, wherein the mahjong table top is installed on the top of the upper upright post, and the mahjong table top is always in a horizontal state, which is convenient for use.

The above prior art solutions have the following drawbacks: because the mahjong table surface and the upper upright post are mutually vertical, when the mahjong table is not used, the occupied space of the mahjong table surface horizontally arranged is too large, which is not beneficial to the reasonable utilization of indoor space.

Disclosure of Invention

The utility model aims at providing a folding base, when not using the mahjong table, reduced the shared usage space of mahjong table.

The above object of the present invention is achieved by the following technical solutions:

a folding base comprises a bottom plate, a supporting column vertically fixed on the bottom plate and a mounting plate mounted at the top of the supporting column; the top of the support column is connected with a rotating shaft horizontally arranged, and the rotating shaft is arranged close to the edge of the support column; the mounting plate is connected to the rotating shaft and is in rotating fit with the rotating shaft; the mounting plate is placed at the top of the support column after rotating.

Through adopting above-mentioned technical scheme, the mahjong mesa is installed on the mounting panel, and when not using the mahjong table, rotate the mahjong mesa and make the mounting panel rotate around rotating for mounting panel and mahjong mesa are located one side of support column, thereby reduce the shared area of mahjong table. After the actual operation is finished, the folded mahjong table top can be placed close to the wall, so that the space occupied by the mahjong table is further reduced. When the mahjong table is needed to be used, the mahjong table top is rotated, so that the mounting plate rotates around the rotating shaft until the mounting plate is placed at the top of the supporting column. Because the mahjong table top has larger mass, the whole formed by the mounting plate and the mahjong table top is directly placed on the top of the support column, and the structural stability of the mahjong table top can be completely ensured.

The utility model discloses further set up to: the side wall of the support column, which is close to the rotating shaft, is inwards recessed to form a groove; when the mounting plate rotates, the part of the mounting plate below the rotating shaft is inserted into the groove.

Through adopting above-mentioned technical scheme, the setting of recess can be so that the pivot reserves certain distance with between the edge of support column to after the mounting panel breaks away from the support column, can improve mounting panel and the holistic structural stability of support column.

The utility model discloses further set up to: a top plate is additionally arranged at the top of the supporting column and is positioned below the rotating shaft; a torsion spring is sleeved outside the rotating shaft; when the mounting panel rotates the back and is located support column one side, the both ends of torsional spring are close to each other and exert the power of keeping away from the support column lateral wall to the mounting panel.

By adopting the technical scheme, when the mahjong table is needed to be used, the mahjong table surface is rotated until the mounting plate is placed on the top of the support column. Because the mahjong table face quality itself is very big, if the operator can not control well when downwards rotating the mahjong table face, will lead to mahjong table face and support column to take place to collide with, the setting of torsional spring can cushion the mounting panel and directly rotate the effort of support column side to protect the mahjong table face, can reduce the noise that the in-process that rotates the mounting panel produced simultaneously.

The utility model discloses further set up to: a protective cover is arranged on one side of the mounting plate, which faces the support column; a positioning bolt is additionally arranged on the side wall of the supporting column, and the positioning bolt is in threaded fit with the supporting column; the positioning bolt is arranged far away from the rotating shaft and is positioned below the rotating shaft; when the mounting panel rotates the back and when supporting in the support column top, the safety cover cup joints in the support column outside, just the edge of safety cover is located between the bolt head of positioning bolt and the outer wall of support column.

By adopting the technical scheme, when the mahjong machine is needed to be used, the mounting plate is rotated to be placed on the top of the support column. At this time, the edge of the protective cover is located between the bolt head of the positioning bolt and the outer wall of the support column. The positioning bolt is screwed down, so that the position of the protective cover is limited, the mounting plate and the mahjong table top on the mounting plate are better limited, and the structural stability of the mahjong machine in the using process is improved.

The utility model discloses further set up to: a socket is formed in the position, corresponding to the positioning bolt, of the protective cover; when the mounting plate rotates, the bolt rod of the positioning bolt is inserted into the socket.

Through adopting above-mentioned technical scheme, inside back when positioning bolt's shank of bolt inserts the socket, the area that lies in between positioning bolt's the bolt head and the support column on the guard shield can be bigger to improved the location effect to the safety cover after screwing up positioning bolt, and then improved the fixed effect to the mahjong mesa.

The utility model discloses further set up to: one side of the protective cover, which is far away from the rotating shaft, is arranged in an arc shape which is convex outwards; a bearing plate group is also arranged between the protective cover and the supporting column; the bearing plate group comprises at least one plate body, two ends of the plate body are sleeved outside the rotating shaft and are in running fit with the rotating shaft in a surrounding mode, and one side, away from the rotating shaft, of the plate body is arranged in an arc shape; when the mounting plate rotates and is supported on the top of the support column, the plate bodies are sequentially sleeved outside the support column, and all the plate bodies are positioned between the protective cover and the support column; when the mounting plate rotates and is positioned on one side of the supporting column, the protective cover and the bearing plate group cover the space between the mounting plate and the top of the supporting column.

Through adopting above-mentioned technical scheme, when not using mahjong machine, rotate the mounting panel and make the mounting panel be located one side of support column. At the moment, the bearing plate group is shifted, so that the bearing plate group covers the space between one side of the support column, which is far away from the rotating shaft, and the mounting plate, and the integral attractiveness of the folded mahjong table is improved. Simultaneously, can protect the space between mounting panel and the support column top, avoid the entering of things such as dust.

The utility model discloses further set up to: a matching opening is formed in the plate body corresponding to the positioning bolt; when the mounting plate rotates, the bolt rod of the positioning bolt is inserted into the inner part of the matching hole.

Through adopting above-mentioned technical scheme, after the shank of bolt of positioning bolt inserted the cooperation mouth, the plate body became bigger in the area that is located between positioning bolt's the bolt head and the support column outer wall for after positioning bolt screwed up, area of contact grow between plate body and the safety cover, thereby can further improve the location effect to mounting panel and mahjong table face.

The utility model discloses further set up to: a shaping plate is fixed on the side wall of the support column far away from the rotating shaft, and the top of the shaping plate does not exceed the top of the support column; the plate body is sleeved outside the shaping plate.

Through adopting above-mentioned technical scheme, because the plate body is kept away from one side of pivot and is the arc setting, when the mounting panel supporting in the support column top, the plate body cup joints in the support column outside, and can be formed with the cavity between the lateral wall that is the arc setting on the plate body and the support column outer wall, this part cavity can be filled in setting up of stereotype board to play the supporting role to plate body, safety cover, improved the stability and the protection effect to plate body and safety cover overall structure.

The utility model discloses further set up to: a first locking component is arranged between one side of the shaping plate close to the plate body and one side of the plate body close to the shaping plate, which faces the shaping plate; the first locking component comprises a first barrier strip and a first convex strip; the first barrier strip is fixed at one end, close to the mounting plate, of the shaping plate, and the first convex strip is fixed at one end, far away from the mounting plate, of the plate body; a second locking assembly is arranged between the adjacent plate bodies and comprises a second barrier strip and a second convex strip; the second stop strip is fixed at one end, close to the mounting plate, of the plate body close to the support column; the second convex strip is fixed to one end, far away from the mounting plate, of the plate body sleeved outside the plate body; a third locking assembly is arranged between the inner wall of the protective cover and the plate body adjacent to the protective cover, and comprises a third barrier strip and a third convex strip; the third weather strip is fixed in the plate body and is close to the one end of mounting panel, and the third sand grip is fixed in the one end of keeping away from the mounting panel on the guard shield.

Through adopting above-mentioned technical scheme, when needs are folded mounting panel and the mahjong mesa on it, unscrew positioning bolt for because first locking subassembly, second locking subassembly and third locking subassembly exist for be a whole all the time between stereotype board, all plate bodies and the safety cover, can protect the space between mounting panel and the support column better, also can improve pleasing to the eye degree, reduce the operation degree of difficulty.

The utility model discloses further set up to: the surface of the mounting plate is provided with two ear plates which are formed by stamping the mounting plate; the rotating shaft penetrates through the two lug plates.

By adopting the technical scheme, firstly, materials can be saved, and partial area of the mounting plate can be used as an ear plate; and secondly, the integrity of the lug plate and the mounting plate is improved, and the lug plate is formed by stamping from the mounting plate, so that the connection performance between the mounting plate and the rotating shaft is better.

To sum up, the utility model discloses a beneficial technological effect does:

1. the mounting plate is rotatably connected to the top of the support column, so that when the mahjong machine is not used, the mounting plate can be grabbed and positioned on one side of the support column, the space occupied by the mahjong machine is reduced, and the utilization rate of indoor space is improved;

2. the protective cover and the bearing plate group are arranged, so that when the mounting plate is positioned on one side of the support column, the space between the mounting plate and the top of the support column is wrapped, the connecting structure in the space is protected, and the service life of the mahjong machine is prolonged.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a cross-sectional view of the vertical structure of fig. 1.

Fig. 3 is an enlarged view of a portion of fig. 2.

In the figure, 1, a bottom plate; 2. a support pillar; 21. a top plate; 211. a through hole; 22. a groove; 23. a rotating shaft; 231. a torsion spring; 3. mounting a plate; 31. an ear plate; 4. shaping plates; 5. a bearing plate group; 51. a first plate body; 52. a second plate body; 6. a protective cover; 61. an extension plate; 62. a socket; 7. a first locking assembly; 71. a first barrier strip; 72. a first rib; 8. a second locking assembly; 81. a second barrier strip; 82. a second convex strip; 9. a third locking assembly; 91. a third barrier strip; 92. a third rib; 10. positioning the bolt; 101. a fitting port.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a folding base, including bottom plate 1, vertical fixation in support column 2 on bottom plate 1 and install in the mounting panel 3 at support column 2 top. One side of the mounting plate 3, which is far away from the support column 2, is used for mounting a mahjong table top, and the area of the mahjong table top is consistent with that of the mounting plate 3.

Referring to fig. 1 and 2, the support column 2 is a hollow metal tubular structure with a square cross section, and a top plate 21 horizontally disposed is welded to the top of the support column 2. A distance is left between the top plate 21 and the top of the support column 2, and a through hole 211 is formed in the middle of the top plate 21. A rotating shaft 23 penetrates through the top of the supporting column 2, and the rotating shaft 23 is welded on the supporting column 2. The rotating shaft 23 is located above the top plate 21, and two ends of the rotating shaft 23 extend outside the supporting column 2. The rotating shaft 23 is arranged in parallel with two side walls of the supporting column 2, and one side wall of the rotating shaft 23.

The mounting plate 3 is a metal plate which is arranged in a square shape, and two lug plates 31 are formed on the surface of the mounting plate 3 through stamping. The two ear plates 31 are perpendicular to the mounting plate 3, and the two ear plates 31 are formed by bending from one side in opposite directions, so that the mounting plate 3 is provided with two holes generated by stamping between the two ear plates 31. The end of the two ear plates 31 far away from the mounting plate 3 is arranged in a semicircular shape. The two ear plates 31 penetrate through the rotating shaft 23, and a bearing is fixed between the ear plates 31 and the rotating shaft 23, so that the ear plates 31 drive the mounting plate 3 to rotate around the rotating shaft 23. The mounting plate 3 is rotated and then placed on the top of the support column 2, and at the moment, the support column 2 is located at the center of the mounting plate 3.

In order to make the mounting plate 3 and the mahjong table surface rotate to the side wall of the support column 2 around the rotating shaft 23, the movement trend of the mounting plate 3 and the mahjong table surface can be slowed down, so that the mounting plate 3 and the mahjong table surface are prevented from directly impacting the side wall of the support column 2, and the torsion spring 231 is sleeved outside the rotating shaft 23. One end of the torsion spring 231 is always abutted against the surface of the mounting plate 3, and the other end of the torsion spring 231 penetrates through the through hole 211. One end of the torsion spring 231 penetrating the through hole 211 is provided in a U shape, and a portion of the end of the torsion spring 231 is bent toward the top plate 21. When the mounting plate 3 is gradually to the lateral wall of the support column 2, the one end of the torsion spring 231 that is in the shape of a U abuts against the lower surface of the top plate 21, and along with the continuous rotation of the mounting plate 3, the two ends of the torsion spring 231 are gradually close to and apply an acting force to the mounting plate 3 away from the lateral wall of the support column 2, so that the impact force of the mounting plate 3 towards the lateral wall of the support column 2 can be buffered.

In order to enable the mounting plate 3 to rotate vertically or approach vertically, a groove 22 is formed in the side wall of the support column 2 adjacent to the rotating shaft 23. When the mounting plate 3 is rotated, the portion of the mounting plate 3 below the rotating shaft 23 is inserted into the groove 22.

In order to improve the overall aesthetic degree of the folded mahjong machine and protect the connecting position of the mounting plate 3 and the support column 2, a shaping plate 4, a bearing plate group 5 and a protective cover 6 are additionally arranged between the mounting plate 3 and the support column 2.

Wherein, the shaping plate 4, the bearing plate group 5 and the protective cover 6 are all made of plastic materials. The shaping plate 4 is fixed on one side of the support column 2 far away from the rotating shaft 23, and the shaping plate 4 is fixedly connected with the support column 2 through screws. The top of the sizing plate 4 does not exceed the top of the support column 2 so that the mounting plate 3 can be supported directly on top of the support column 2.

The bearing plate group 5 is sleeved outside the support column 2, and the shaping plate 4 is positioned between the bearing plate group 5 and the support column 2. The receiving plate group 5 is composed of at least one plate body, and two plate bodies are exemplified in each embodiment. The two plate bodies are named as a first plate body 51 and a second plate body 52 respectively, and the second plate body 52 is sleeved outside the first plate body 51. The two ends of the first plate 51 and the second plate 52 are sleeved outside the rotating shaft 23, and the first plate 51 and the rotating shaft 23, and the second plate 52 and the rotating shaft 23 are rotatably matched through bearings.

The sides of the first plate 51 and the second plate 52 away from the rotating shaft 23 are both arranged in a convex arc shape, and the circle centers of the arc-shaped parts of the first plate 51 and the second plate 52 are both located on the rotating shaft 23.

The protective cover 6 is sleeved outside the second plate 52, and an extension plate 61 is formed by extending the edge of the protective cover 6. The extension plate 61 of the protection cover 6 is attached to one side of the mounting plate 3 facing the support column 2, and the extension plate 61 is fixed to the mounting plate 3 by screws. One side of the protective cover 6 far away from the rotating shaft 23 is arc-shaped, and the center of the arc is located on the rotating shaft 23. When the mounting plate 3 is supported on the top of the support column 2, the first plate 51, the second plate 52 and the protective cover 6 are sequentially sleeved outside the support column 2 from inside to outside.

In order to improve the structural stability of the mounting plate 3 supported on the top of the support pillar 2, two positioning bolts 10 penetrate through the side wall of the support pillar 2. The two positioning bolts 10 are respectively positioned on the side walls of the support column 2 corresponding to the two ends of the rotating shaft 23, and the positioning bolts 10 are in threaded fit with the support column 2. Correspondingly, the first plate body 51 and the second plate body 52 are provided with matching openings 101 corresponding to the positioning bolts 10, and the matching openings 101 penetrate through the first plate body 51 and the second plate body 52 and are arranged towards the edge of the support column 2. The protective cover 6 is provided with a socket 62 corresponding to the position of the positioning bolt 10, and the socket 62 is arranged on the protective cover 6 and faces the edge of the support column 2. When the mounting plate 3 is supported on top of the support column 2, the shank of the positioning bolt 10 is inserted simultaneously into the mating opening 101 and the socket 62. At this time, the positioning bolt 10 is tightened so that the edges of the first plate body 51, the second plate body 52 and the protection cover 6 are clamped between the support column 2 and the bolt head of the positioning bolt 10, thereby improving the positioning effect on the mounting plate 3.

Referring to fig. 2 and 3, in order to allow the space between the mounting plate 3 and the support column 2 rotated to the side of the support column 2 to be covered by the receiving plate group 5 and the protective cover 6, a first locking assembly 7, a second locking assembly 8 and a third locking assembly 9 are respectively disposed between the fixing plate 4 and the first plate 51, between the first plate 51 and the second plate 52, and between the second plate 52 and the protective cover 6.

The first locking assembly 7 includes a first barrier strip 71 fixed on the shaping plate 4 and facing one side of the first plate 51, and a first protruding strip 72 fixed on the first plate 51 and facing one side of the shaping plate 4; the first barrier strip 71 is fixed at one end of the shaping plate 4 close to the mounting plate 3, and the first protruding strip 72 is fixed at one end of the plate body far away from the mounting plate 3. Second locking assembly 8 comprises a second bar 81 fixed to first plate 51 facing second plate 52 and a second bar 82 fixed to second plate 52 facing first plate 51; the second rib 81 is fixed to an end of the first plate 51 close to the mounting plate 3, and the second rib 82 is fixed to an end of the second plate 52 far from the mounting plate 3. The third locking assembly 9 comprises a third barrier strip 91 fixed on the second plate 52 and facing the side of the protective cover 6, and a third convex strip 92 on the protective cover 6 and facing the side of the second plate 52; the third rib 91 is fixed to an end of the second plate 52 close to the mounting plate 3, and the third rib 92 is fixed to an end of the protection cover 6 far from the mounting plate 3.

When the mounting plate 3 on the top of the support column 2 needs to be rotated to one side of the support column 2, a force is applied to one end of the mounting plate 3, which is far away from the rotating shaft 23, so that the mounting plate 3 rotates around the rotating shaft 23 until the mounting plate 3 is inserted into the groove 22. With the rotation of the mounting plate 3, the end of the first plate 51 away from the rotating shaft 23 gradually moves away from the supporting post 2 until the first protruding strip 72 and the first blocking strip 71 abut against each other, and the position of the first plate 51 is locked. With the continuous rotation of the mounting plate 3, the end of the second plate 52 away from the rotating shaft 23 gradually leaves away from the first plate 51 until the second protruding strip 82 and the second blocking strip 81 interfere with each other, and the position of the second plate 52 is locked. As the mounting plate 3 continues to rotate, the protective cover 6 gradually moves away from the second plate 52 until the third protruding strip 92 and the third protruding strip 91 interfere with each other, and at the same time, the mounting plate 3 is inserted into the groove 22.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A folding base comprises a bottom plate (1), a supporting column (2) vertically fixed on the bottom plate (1) and a mounting plate (3) mounted at the top of the supporting column (2); the method is characterized in that: the top of the supporting column (2) is connected with a rotating shaft (23) which is horizontally arranged, and the rotating shaft (23) is arranged close to the edge of the supporting column (2); the mounting plate (3) is connected to the rotating shaft (23), and the mounting plate (3) is in rotating fit with the rotating shaft (23); the mounting plate (3) is placed at the top of the support column (2) after rotating.

2. The folding base of claim 1, wherein: the side wall of the support column (2) close to the rotating shaft (23) is recessed inwards to form a groove (22); when the mounting plate (3) rotates, the part of the mounting plate (3) below the rotating shaft (23) is inserted into the groove (22).

3. A folding base according to claim 1 or 2, wherein: a top plate (21) is additionally arranged at the top of the supporting column (2), and the top plate (21) is positioned below the rotating shaft (23); a torsion spring (231) is sleeved outside the rotating shaft (23); when the mounting plate (3) rotates and then is positioned on one side of the supporting column (2), the two ends of the torsion spring (231) are close to each other and exert a force far away from the side wall of the supporting column (2) on the mounting plate (3).

4. The folding base of claim 1, wherein: a protective cover (6) is arranged on one side of the mounting plate (3) facing the support column (2); a positioning bolt (10) is additionally arranged on the side wall of the supporting column (2), and the positioning bolt (10) is in threaded fit with the supporting column (2); the positioning bolt (10) is far away from the rotating shaft (23), and the positioning bolt (10) is positioned below the rotating shaft (23); when mounting panel (3) rotate the back and when supporting in support column (2) top, safety cover (6) cup joint in support column (2) outside, just the edge of safety cover (6) is located between the bolt head of positioning bolt (10) and the outer wall of support column (2).

5. The folding base of claim 4, wherein: a socket (62) is formed in the position, corresponding to the positioning bolt (10), of the protective cover (6); when the mounting plate (3) is rotated, the bolt rod of the positioning bolt (10) is inserted into the socket (62).

6. The folding base of claim 4, wherein: one side of the protective cover (6) far away from the rotating shaft (23) is arranged in an outward convex arc shape; a bearing plate group (5) is also arranged between the protective cover (6) and the supporting column (2); the bearing plate group (5) comprises at least one plate body, two ends of the plate body are sleeved outside the rotating shaft (23) and are in running fit with the rotating shaft (23) in a rotating mode, and one side, far away from the rotating shaft (23), of the plate body is arranged in an arc shape; when the mounting plate (3) rotates and is supported on the top of the support column (2), the plate bodies are sequentially sleeved outside the support column (2), and all the plate bodies are positioned between the protective cover (6) and the support column (2); when the mounting plate (3) rotates and then is positioned on one side of the supporting column (2), the protective cover (6) and the bearing plate group (5) cover the space between the mounting plate (3) and the top of the supporting column (2).

7. The folding base of claim 6, wherein: a matching opening (101) is formed in the plate body corresponding to the position of the positioning bolt (10); when the mounting plate (3) rotates, the bolt rod of the positioning bolt (10) is inserted into the matching opening (101).

8. The folding base of claim 6, wherein: a shaping plate (4) is fixed on the side wall, far away from the rotating shaft (23), of the supporting column (2), and the top of the shaping plate (4) does not exceed the top of the supporting column (2); the plate body is sleeved outside the shaping plate (4).

9. The folding base of claim 8, wherein: a first locking component (7) is arranged between one side of the shaping plate (4) close to the plate body and one side of the plate body close to the shaping plate (4) and facing the shaping plate (4); the first locking component (7) comprises a first barrier strip (71) and a first convex strip (72); the first barrier strip (71) is fixed at one end, close to the mounting plate (3), of the shaping plate (4), and the first convex strip (72) is fixed at one end, far away from the mounting plate (3), of the plate body; a second locking assembly (8) is arranged between the adjacent plate bodies, and the second locking assembly (8) comprises a second barrier strip (81) and a second convex strip (82); the second barrier strip (81) is fixed at one end, close to the mounting plate (3), of the plate body close to the support column (2); the second convex strip (82) is fixed to one end, far away from the mounting plate (3), of the plate body outside the plate body in a sleeved mode; a third locking assembly (9) is arranged between the inner wall of the protective cover (6) and the adjacent plate body of the protective cover (6), and the third locking assembly (9) comprises a third barrier strip (91) and a third convex strip (92); the third barrier strip (91) is fixed at one end, close to the mounting plate (3), of the plate body, and the third convex strip (92) is fixed at one end, far away from the mounting plate (3), of the protection cover (6).

10. The folding base of claim 1, wherein: the surface of the mounting plate (3) is provided with two ear plates (31), and the ear plates (31) are formed by stamping the mounting plate (3); the rotating shaft (23) penetrates through the two lug plates (31).