CN114060690A

CN114060690A - School dining room is with bright kitchen light kitchen internet monitoring display device

Info

Publication number: CN114060690A
Application number: CN202111568171.0A
Authority: CN
Inventors: 杨建兴; 王永辉; 陈志鹏
Original assignee: Guangdong Xingbao Construction Co ltd
Current assignee: Guangdong Xingbao Construction Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-02-18

Abstract

The invention discloses an Internet monitoring and displaying device for a bright kitchen range used in a canteen of a school, which comprises a base, wherein a back plate is vertically and fixedly arranged on the upper part of the base, a mounting groove is formed in the upper part of one side of the back plate, a display screen group is fixedly arranged on the inner wall of the mounting groove, a containing groove is formed in the bottom wall of the mounting groove, a cleaning mechanism is arranged in the containing groove, a rectangular groove is formed in the bottom of the base, third tooth columns are rotatably arranged at the four corners of the top wall in the rectangular groove, internal threads are formed in the third tooth columns along the inner walls of the third tooth columns, threaded columns are in threaded connection with the lower ends of the third tooth columns, universal wheels are arranged at the lower ends of the threaded columns, and a limiting assembly is arranged between the threaded columns and the base. According to the invention, after the four universal wheels are folded, the four supporting legs just extend out, and the four sides of the base form the auxiliary supporting frame, so that the supporting area is increased, the device is placed more stably, manual cleaning is not needed, and manpower is saved.

Description

School dining room is with bright kitchen light kitchen internet monitoring display device

Technical Field

The invention relates to the technical field of monitoring display screens, in particular to an Internet monitoring display device for a bright kitchen range for a school canteen.

Background

The Mingchi bright oven refers to a form that a catering service provider adopts transparent glass, video and other modes to show relevant processes of catering services to the public society, so that customers of catering enterprises can visually see whether the operation of kitchen staff is standard, whether the sanitation is qualified or not and whether some objects which should not appear exist or not, the Mingchi bright oven is used for supervising the staff of the catering enterprises, the Mingchi bright oven work is deployed and developed by the State food and drug administration headquarters in 2014, the catering service units which have implemented Mingchi bright ovens in China account for 27.52 percent of the total number of certificates until 2016, the Mingchi food and drug administration in 2019 for 14 days, the number of Mingchi bright ovens in national schools reaches 31.86 ten thousands of households, the coverage rate accounts for 84 percent of the number of canteens in direct jurisdictions, the number of 'bright kitchen light ranges' of school canteens in provincial society cities and planning single-row cities is 5.28 thousands of households, and the coverage rate accounts for 91% of the number of school canteens.

Bright kitchen of bright kitchen relies on the internet monitoring to add the display end to realize mostly, the school dining room of the bright kitchen of most implementation all can set up the control display screen group in the district of ordering and supply teachers and students to supervise and watch, however, current control display screen group is not convenient for remove, make people be difficult to carry out mobile operation such as position adjustment to it, and simultaneously, because the area of display screen group is great usually, use the easy deposition of screen for a long time, the manual work is cleared up inconveniently, scrape bad display screen easily, and mobilizable setting display screen group, stability must improve when it is placed, therefore, the bright kitchen internet monitoring display device of bright kitchen for the dining room of school is now provided.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an Internet monitoring and displaying device for a bright kitchen range for a school canteen.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a school's dining room is with bright kitchen Internet monitoring display device, the on-line screen storage device comprises a base, base upper portion vertical fixation is equipped with the backplate, and division of backplate one side upper portion has the mounting groove, and mounting groove inner wall fixed mounting has display screen group, the mounting groove diapire is opened has the groove of accomodating, accomodates the inslot and is equipped with clean mechanism, and the base bottom is opened there is the rectangular channel, and inside roof four corners position department of rectangular channel all rotates and is equipped with the third tooth post, and the third tooth post is opened along its inner wall has the internal thread, and the equal threaded connection of third tooth post lower extreme has the screw thread post, and the universal wheel is all installed to screw thread post lower extreme, is equipped with spacing subassembly between screw thread post and the base, be equipped with drive lifting unit in the base, be equipped with linkage auxiliary stay mechanism in the base.

Preferably, clean mechanism includes the side channel that the mounting groove both sides were seted up, and the side channel lower extreme with accomodate the groove and be linked together, accomodate groove diapire both ends and all rotate and be equipped with the lead screw, and all overlap on the lead screw and be equipped with ball nut, two ball nuts are close to one side relatively and all rotate and be equipped with the second gear, fixedly between two second gears being equipped with same cleaning roller, and paste on the cleaning roller and have clean brush hair, the perpendicular one side of side channel all opens perpendicularly has tooth, and tooth and second gear looks adaptation, first cavity has all been opened at the lower part both ends in the backplate, and all fixes being equipped with first motor in the first cavity, and two lead screws all pass first cavity respectively with two first motor output key-connections.

Further, drive lifting unit includes that rectangular channel roof both ends all rotate the fluted disc that sets up, and lie in with two third tooth posts of one side respectively with two fluted disc meshings, the equal coaxial fixation in fluted disc lower part is equipped with first tooth post, and rectangular channel roof intermediate position department rotates and is equipped with two first gears, and two first gear intermeshing, and the equal coaxial fixation in first gear lower part is equipped with the second tooth post, and lies in and all overlap and be equipped with a belt between first tooth post, the second tooth post with one side, lower part intermediate position department opens in the backplate has the second cavity, and the second cavity internal fixation is equipped with the second motor, and second motor output passes rectangular channel roof and one of them first gear key-type connection.

Preferably, the linkage auxiliary supporting mechanism comprises sliding sleeves, wherein the sliding sleeves are fixedly arranged at two ends of inner walls of two sides of the rectangular groove, one end of each sliding sleeve slides to insert and be provided with a rack, the sliding sleeves are arranged on two sides of the same side in a staggered mode, the two racks on the same side are respectively meshed with two sides of one of the first tooth columns, one end of each sliding sleeve is far away from the rack and is fixedly provided with a supporting leg, the lower ends of the supporting legs are fixedly provided with anti-skidding blocks, two ends of outer walls of two sides of the base are provided with extension openings, and the extension openings are matched with the supporting legs.

Still further, the positions, close to the racks, of the top walls of the rectangular grooves are fixedly provided with L-shaped rods, the lower ends of the L-shaped rods are fixedly connected with rectangular rings, and the rectangular rings are respectively sleeved at one end of each rack in a sliding mode.

As a further scheme of the invention, the limiting assembly comprises guide grooves formed in two ends of the inner walls of two sides of the rectangular groove, guide pins are horizontally and fixedly arranged on the outer wall of one side of the threaded column, and the guide pins are arranged in the guide grooves in a sliding mode.

As a further scheme of the invention, the limiting assembly comprises polygonal rods coaxially arranged in the third tooth column, the upper ends of the polygonal rods are fixedly arranged on the top wall of the rectangular groove, polygonal grooves are formed in the upper ends of the threaded columns, and the polygonal rods are slidably inserted in the polygonal grooves.

The invention has the beneficial effects that:

1. through the clean mechanism of accomodating the groove and accomodating the inslot and setting up of seting up in the mounting groove lower part, when making people need clean display screen group, only need open the switch and open two first motors and drive the lead screw and rotate, make two ball nuts drive the cleaning roller rebound, during the removal, the second gear at cleaning roller both ends and the tooth meshing on the side inslot inner wall, drive the cleaning roller rotation, and the laminating of cleaning roller and display screen group, realize that the automatic clearance sweeps the ash, need not artifical cleanness, the use of manpower sparingly, and clean no dead angle, the effect is better.

2. Through the universal wheel that a plurality of third tooth posts and third tooth post lower extreme that set up in the base pass through threaded column connection, the drive lifting unit who sets up in the cooperation base, make people pass this display device to assigned position after, only need drive second motor to drive one of them first gear revolve, through the belt, first tooth post, the transmission such as fluted disc, it is rotatory to drive the third tooth post, realize the threaded post simultaneously and rotate the promotion under uide pin and guide way effect, realize the automation of a plurality of universal wheels and pack up, make this device stably place.

3. Through the linkage auxiliary stay mechanism that sets up between base and drive lifting unit for the fluted disc drives a plurality of third tooth post pivoted and drives its coaxial first tooth post and rotates simultaneously, make two rack relative slip of first tooth post both sides, the supporting legs that drives rack one end pass and stretch out the mouth and stretch out to the outside, four universal wheels pack up the back, four supporting legs just in time are all stretched out, form an auxiliary stay frame at the base four sides, the support area has been increased, make this device place more firm.

Drawings

Fig. 1 is a schematic perspective view of a base in an embodiment 1 of a bright kitchen oven internet monitoring display device for a school canteen according to the present invention;

FIG. 2 is a schematic view of a three-dimensional structure of the internal mechanism of a base of the bright kitchen range internet monitoring display device for a school canteen;

FIG. 3 is a schematic perspective view of a part of the internal mechanism of a base of the bright kitchen range internet monitoring display device for a school canteen;

FIG. 4 is a schematic bottom view of a base of the kitchen light range Internet monitoring display device for a school canteen according to the present invention;

FIG. 5 is a schematic cross-sectional view of a planar plate of the kitchen light range Internet monitoring display device for a school canteen according to the present invention;

FIG. 6 is a schematic perspective view of a cleaning mechanism of the kitchen light range Internet monitoring display device for a school canteen according to the present invention;

FIG. 7 is a schematic perspective view of a kitchen light range Internet monitoring display device for a school canteen according to the present invention;

fig. 8 is a schematic sectional plan view of a third tooth post of an embodiment 2 of the bright kitchen range internet monitoring display device for a school canteen according to the present invention.

In the figure: 1. a base; 2. a back plate; 3. a display screen group; 4. a side groove; 5. a universal wheel; 6. an extension opening; 7. a sliding sleeve; 8. a rack; 9. a fluted disc; 10. a first tooth post; 11. a second tooth post; 12. a belt; 13. a rectangular groove; 14. a guide groove; 15. a third tooth post; 16. a threaded post; 17. supporting legs; 18. a rectangular ring; 19. an L-shaped rod; 20. a first gear; 21. a guide pin; 22. a ball nut; 23. a screw rod; 24. a second gear; 25. a cleaning roller; 26. a first cavity; 27. a first motor; 28. a second cavity; 29. a second motor; 30. a receiving groove; 31. anti-skid blocks; 32. teeth; 33. an internal thread; 34. a polygonal rod; 35. and (4) mounting the groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Embodiment 1, refer to fig. 1-7, a school's dining room is with bright kitchen light kitchen internet monitoring display device, including

base

1, 1 upper portion vertical fixation of base is equipped with

backplate

2, and 2 one side upper portions of backplate are opened there is mounting groove 35, mounting groove 35 inner wall fixed mounting has

display screen group

3, 35 diapire of mounting groove is opened there is accommodating groove 30, it is equipped with clean mechanism in the groove 30 to accommodate, open bottom base 1 has rectangular channel 13, the inside roof four corners position department of rectangular channel 13 all rotates and is equipped with third tooth post 15, and third tooth post 15 is opened along its inner wall has internal thread 33, the equal threaded connection of 15 lower extremes of third tooth post has screw thread post 16, universal wheel 5 is all installed to screw thread post 16 lower extreme, be equipped with spacing subassembly between screw thread post 16 and the base 1, be equipped with drive lifting unit in the base 1, be equipped with linkage auxiliary stay mechanism in the base 1.

In this embodiment, clean mechanism includes the side channel 4 that mounting groove 35 both sides were seted up, and the 4 lower extremes of side channel are linked together with accomodating groove 30, it all rotates and is equipped with lead screw 23 to accomodate groove 30 diapire both ends, and all the cover is equipped with ball nut 22 on the lead screw 23, two ball nut 22 are close to one side relatively and all rotate and are equipped with second gear 24, the fixed same cleaning roller 25 that is equipped with between two second gear 24, and paste on the cleaning roller 25 and have clean brush hair, the equal perpendicular one side in side channel 4 is opened perpendicularly has tooth 32, and

tooth

32 and 24 looks adaptations of second gear, first cavity 26 has all been opened at backplate 2 lower part both ends, and all fix in the first cavity 26 and be equipped with first motor 27, two lead screws 23 all pass first cavity 26 respectively with two first motor 27 output key-connections.

In the concrete implementation, drive lifting unit includes that rectangular channel 13 roof both ends all rotate the fluted disc 9 that sets up, and lie in two third tooth posts 15 with same one side and mesh with two fluted discs 9 respectively, the equal coaxial fixed first tooth post 10 that is equipped with in fluted disc 9 lower part, rectangular channel 13 roof intermediate position department rotates and is equipped with two first gears 20, and two first gears 20 intermeshing, the equal coaxial fixed second tooth post 11 that is equipped with in first gear 20 lower part, and lie in first tooth post 10 with same one side, all overlap between the second tooth post 11 and be equipped with a belt 12, lower part intermediate position department opens in backplate 2 has second cavity 28, and second cavity 28 internal fixation is equipped with second motor 29, second motor 29 output passes rectangular channel 13 roof and one of them first gear 20 key-type connection.

Further, the linkage auxiliary stay mechanism includes that rectangular channel 13 both sides inner wall both ends are all fixed sliding sleeve 7 that sets up, and 7 one ends of sliding sleeve all slide and insert and be equipped with rack 8, and lie in two rack 8 dislocation sets with one side, lie in two rack 8 with one side respectively with the meshing of 10 both sides of one of them first tooth post, 7 one end of sliding sleeve is all fixed and is equipped with supporting legs 17 is kept away from to rack 8, and supporting legs 17 lower extreme is all fixed and is equipped with non slipping spur 31, base 1 both sides outer wall both ends are all opened there is extension 6, and extension 6 and supporting legs 17 looks adaptation.

Specifically, the top wall of the rectangular groove 13 is provided with an L-shaped rod 19 at a position close to the rack 8, the lower end of the L-shaped rod 19 is fixedly connected with a rectangular ring 18, and the rectangular ring 18 is respectively sleeved on one end of the rack 8 in a sliding manner.

Concretely, spacing subassembly includes the guide way 14 that rectangular channel 13 both sides inner wall both ends all seted up, and 16 one side outer walls of screw thread post are the equal level fixed guide pin 21 that is equipped with, and guide pin 21 all slides and locate in the guide way 14.

From the above description, it can be seen that the above embodiment 1 of the present invention achieves the following technical effects: when the display device is used, after the display device is pushed to a designated position, people only need to drive the second motor 29 to drive one of the first gears 20 to rotate, the third toothed columns 15 are driven to rotate through the transmission of the belt 12, the first toothed columns 10, the fluted disc 9 and the like, meanwhile, the threaded columns 16 are driven to rotate and ascend under the action of the guide pins 21 and the guide grooves 14, the plurality of universal wheels 5 are automatically retracted, the display device is stably placed, the fluted disc 9 drives the plurality of third toothed columns 15 to rotate and simultaneously drives the coaxial first toothed columns 10 to rotate, two racks 8 on two sides of the first toothed columns 10 relatively slide, the supporting legs 17 at one ends of the racks 8 are driven to penetrate through the extension openings 6 and extend to the outside, after the four universal wheels 5 are retracted, the four supporting legs 17 just extend out, an auxiliary supporting frame is formed on four sides of the base 1, the supporting area is increased, the display device is placed more stably, and when people need to clean the display screen group 3, only need open the switch and open two first motors 27 and drive lead screw 23 and rotate for two ball nut 22 drive cleaning roller 25 rebound, during the removal, the second gear 24 at cleaning roller 25 both ends meshes with tooth 32 on the side channel 4 inner wall, drives cleaning roller 25 rotation, and cleaning roller 25 and the laminating of display screen group 3 realize that the automatic clearance sweeps the ash, need not artifical cleanness, use manpower sparingly, and clean no dead angle, the effect is better.

Embodiment 2, referring to fig. 2-8, the difference from embodiment 1 is only that the limiting assembly includes a polygonal rod 34 coaxially disposed in the third toothed column 15, the upper ends of the polygonal rods 34 are all fixed to the top wall of the rectangular groove 13, the upper ends of the threaded columns 16 are all provided with polygonal grooves, and the polygonal rods 34 are all slidably inserted into the polygonal grooves.

The above embodiment 2 of the present invention achieves the following technical effects: when the display device is used, after the display device is pushed to a designated position, people only need to drive the second motor 29 to drive one of the first gears 20 to rotate, the third toothed column 15 is driven to rotate through the transmission of the belt 12, the first toothed column 10, the fluted disc 9 and the like, and the threaded column 16 is driven to rotate and ascend under the action of the polygonal rod 34 and the polygonal groove, so that the plurality of universal wheels 5 are automatically retracted, the display device is stably placed, the fluted disc 9 drives the plurality of third toothed columns 15 to rotate and simultaneously drives the coaxial first toothed column 10 to rotate, so that the two racks 8 at two sides of the first toothed column 10 relatively slide, the supporting legs 17 at one end of the racks 8 are driven to penetrate through the extension openings 6 and extend to the outside, after the four universal wheels 5 are retracted, the four supporting legs 17 just extend out, an auxiliary supporting frame is formed at four sides of the base 1, the supporting area is increased, and the display device is placed more stably, when people need clean display screen group 3, only need open the switch and open two first motors 27 and drive lead screw 23 and rotate, make two ball nut 22 drive cleaning roller 25 rebound, during the removal, second gear 24 and the tooth 32 meshing on the side channel 4 inner wall at cleaning roller 25 both ends, drive cleaning roller 25 rotation, and cleaning roller 25 and the laminating of display screen group 3, realize that the automatic clearance sweeps the ash, need not artifical cleanness, the manpower is saved, and clean no dead angle, the effect is better.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a bright kitchen internet monitoring display device of school's dining room, includes base (1), its characterized in that, base (1) upper portion vertical fixation is equipped with backplate (2), and backplate (2) one side upper portion is opened there is mounting groove (35), and mounting groove (35) inner wall fixed mounting has display screen group (3), mounting groove (35) diapire is opened and is taken in groove (30), is equipped with clean mechanism in taking in groove (30), and open rectangular channel (13) base (1) bottom, and the inside roof four corners position department of rectangular channel (13) all rotates and is equipped with third tooth post (15), and third tooth post (15) have internal thread (33) along its inner wall, and the equal threaded connection of third tooth post (15) lower extreme has screw thread post (16), and universal wheel (5) are all installed to screw thread post (16) lower extreme, are equipped with spacing subassembly between screw thread post (16) and base (1), the lifting device is characterized in that a driving lifting assembly is arranged in the base (1), and a linkage auxiliary supporting mechanism is arranged in the base (1).

2. The Internet monitoring and displaying device for the bright kitchen range for the school canteen according to claim 1, wherein the cleaning mechanism comprises side grooves (4) formed in two sides of a mounting groove (35), the lower ends of the side grooves (4) are communicated with a containing groove (30), lead screws (23) are rotatably arranged at two ends of the bottom wall of the containing groove (30), ball nuts (22) are sleeved on the lead screws (23), second gears (24) are rotatably arranged on one sides of the two ball nuts (22) close to each other, a same cleaning roller (25) is fixedly arranged between the two second gears (24), cleaning bristles are adhered to the cleaning roller (25), teeth (32) are perpendicularly arranged on one perpendicular side of each side groove (4), the teeth (32) are matched with the second gears (24), first cavities (26) are formed in two ends of the inner lower portion of the back plate (2), and first motors (27) are fixedly arranged in the first cavities (26), the two screw rods (23) penetrate through the first cavity (26) and are connected with output end keys of the two first motors (27) respectively.

3. The Internet monitoring and displaying device for the light kitchen range used in the school canteen according to claim 2, wherein the driving lifting assembly comprises a fluted disc (9) rotatably arranged at both ends of the top wall of a rectangular groove (13), two third fluted columns (15) positioned on the same side are respectively meshed with the two fluted discs (9), first fluted columns (10) are coaxially and fixedly arranged at the lower parts of the fluted discs (9), two first gears (20) are rotatably arranged at the middle positions of the top wall of the rectangular groove (13), the two first gears (20) are mutually meshed, second fluted columns (11) are coaxially and fixedly arranged at the lower parts of the first gears (20), a belt (12) is sleeved between the first fluted columns (10) and the second fluted columns (11) positioned on the same side, a second cavity (28) is formed at the middle position of the inner lower part of the back plate (2), and a second motor (29) is fixedly arranged in the second cavity (28), the output end of the second motor (29) penetrates through the top wall of the rectangular groove (13) and is in key connection with one of the first gears (20).

4. The Internet monitoring and displaying device for the bright kitchen light oven for the school canteen according to claim 3, wherein the linkage auxiliary supporting mechanism comprises sliding sleeves (7) fixedly arranged at two ends of inner walls of two sides of a rectangular groove (13), racks (8) are slidably inserted into one ends of the sliding sleeves (7), the two racks (8) on the same side are arranged in a staggered manner, the two racks (8) on the same side are respectively meshed with two sides of one first tooth column (10), supporting legs (17) are fixedly arranged at one ends, far away from the sliding sleeves (7), of the racks (8), anti-skid blocks (31) are fixedly arranged at the lower ends of the supporting legs (17), extension openings (6) are respectively formed at two ends of outer walls of two sides of the base (1), and the extension openings (6) are matched with the supporting legs (17).

5. The Internet monitoring and displaying device for the bright kitchen light oven for the school canteen according to claim 4, wherein L-shaped rods (19) are fixedly arranged at positions, close to the rack (8), of the top wall of the rectangular groove (13), rectangular rings (18) are fixedly connected to lower ends of the L-shaped rods (19), and the rectangular rings (18) are respectively slidably sleeved at one end of the rack (8).

6. The Internet monitoring and displaying device for the bright kitchen light oven for the school canteen according to claim 1, wherein the limiting assembly comprises guide grooves (14) formed in two ends of the inner wall of each of the two sides of the rectangular groove (13), guide pins (21) are horizontally and fixedly arranged on the outer wall of one side of each of the threaded columns (16), and the guide pins (21) are slidably arranged in the guide grooves (14).

7. The Internet monitoring and displaying device for the bright kitchen light oven used in the school canteen according to claim 1, wherein the limiting assembly comprises polygonal rods (34) coaxially arranged in the third toothed column (15), the upper ends of the polygonal rods (34) are fixedly arranged on the top wall of the rectangular groove (13), polygonal grooves are formed in the upper ends of the threaded columns (16), and the polygonal rods (34) are slidably inserted in the polygonal grooves.