Three-dimensional model interactive demonstration device

Abstract

The invention discloses a three-dimensional model interactive demonstration device, which relates to the technical field of demonstration devices and comprises a bottom box, and a bottom cavity and a top cavity are sequentially formed in the bottom box from top to bottom. A cleaning structure is matched with a dust collecting structure, a second motor drives a glass cover to rotate, meanwhile, a rubber scraping plate is tightly attached to the outer wall of the glass cover, dust and stains attached to the glass cover are effectively scraped off, along with rotation of the glass cover, a third driven gear rotates along with a second driven gear, a fan is driven to generate suction force in a bent pipe, and dust removal is achieved. Dust is sucked by the dust suction inlet, enters the S-shaped pipe through the dust suction pipe and enters the dust collection tank in a one-way mode under the action of the one-way air outlet valve, so that the cleanliness of the surface of the glass cover is guaranteed, people can view a model in the glass cover, backflow and leakage of the dust are effectively prevented, and high efficiency and safety in the dust collection process are guaranteed. Meanwhile, it is ensured that people can clearly observe the details of the model all the time and are not interfered by stains.

Description

Technical Field

[0001] The present invention relates to the technical field of demonstration devices, and specifically to a three-dimensional model interactive demonstration device. Background Art

[0002] In the field of three-dimensional model interactive demonstration, the glass cover, as an important component for protecting the model from external interference, the cleanliness of its surface directly affects the visual experience of viewers. Traditional cleaning methods for glass covers mostly rely on manual operation, which is not only inefficient, difficult to ensure cleaning uniformity and thoroughness, but also the dust and stains generated during cleaning are not easily effectively collected and processed, and are likely to cause secondary pollution to the surrounding environment.

[0003] Especially in educational institutions such as schools and training institutions, three-dimensional model interactive demonstration devices are used for teaching demonstrations and scientific research experiment displays. Students need to clearly observe the details of the models to understand abstract knowledge and concepts. However, traditional manual cleaning methods may affect the normal teaching progress due to improper cleaning time arrangements, and may also fail to clean the stains on the glass cover surface in a timely manner, interfering with students' observation of the models, thereby reducing the teaching effect.

[0004] Based on this, a three-dimensional model interactive demonstration device is now provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0005] The purpose of the present invention is to provide a three-dimensional model interactive demonstration device to solve the problems in the background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A three-dimensional model interactive demonstration device includes a bottom box. The bottom box is provided with a bottom cavity and a top cavity from top to bottom in sequence. Both the front and rear ends of the bottom box are hingedly installed with box doors, and a display structure is arranged inside the bottom cavity.

[0008] The display structure includes a motor one installed inside the bottom cavity. The output shaft of the motor one is fixedly connected to a driving gear one. The driving gear one is meshed with a driven gear one. The upper end of the driven gear one is fixedly provided with a multi-stage telescopic rod. The telescopic end of the multi-stage telescopic rod is fixedly provided with a placement seat for placing the model. A glass cover is arranged outside the placement seat. The glass cover is rotatable with the bottom box. The bottom end of the glass cover is connected to a cleaning structure. Two induction probes are symmetrically installed on both sides of the front end of the bottom box. The induction probes are electrically connected to a controller. The controller is installed at the right end of the bottom box. The controller is electrically connected to the motor one and the multi-stage telescopic rod.

[0009] Preferably, the cleaning structure includes a second motor installed inside the bottom cavity. The second motor is electrically connected to the controller. The output end of the second motor extends into the top cavity and is fixedly connected to a second driving gear. The second driving gear meshes with a second driven gear. The second driven gear is rotatably connected to the placement seat. A glass cover is fixedly installed at the upper end of the second driven gear. An arc-shaped block is arranged behind the glass cover. The arc-shaped block is fixed to the upper end of the bottom box. One end of the arc-shaped block close to the glass cover is fixed with a rubber scraping plate that fits against the outer wall of the glass cover. A dust collection structure is arranged inside the bottom cavity.

[0010] Preferably, the dust collection structure includes a dust suction port. The dust suction port is opened at one end of the arc-shaped block close to the glass cover. The dust suction port is located on the right side of the rubber scraping plate. A dust suction pipe is installed at the lower end of the arc-shaped block. The inside of the dust suction port is connected to one end of an S-shaped pipe through the dust suction pipe. The other end of the S-shaped pipe extends into the dust collection tank and is fixedly connected to a dust discharge pipe. A one-way air outlet valve is installed inside the S-shaped pipe. The inside of the dust collection tank is connected to the inside of a bent pipe through a trachea. The bent pipe is fixed to the upper end of the bottom box. The pipe orifice of the trachea located inside the dust collection tank is higher than the connection position of the S-shaped pipe and the dust discharge pipe. The bottom end of the bent pipe extends into the top cavity and is rotatably connected to a third driven gear. The third driven gear meshes with the second driven gear. A fan is fixedly connected to the upper end of the third driven gear through a fixing rod. The fan is located inside the bent pipe. A filter plate is installed at the other end of the bent pipe.

[0011] Preferably, a first limiting ring is fixedly installed on the outer wall of the S-shaped pipe. An inductor is arranged at the bottom end of the first limiting ring. A second limiting ring is fixedly installed on the outer wall of the bottom end of the dust discharge pipe. A filter cover is arranged between the first limiting ring and the second limiting ring. A fixing cylinder is fixedly installed at the upper end of the filter cover. The inner walls of the filter cover and the fixing cylinder slide against the outer walls of the S-shaped pipe and the dust discharge pipe. A fixing ring is fixedly installed at the top end of the outer wall of the fixing cylinder. The fixing ring matches the first limiting ring. A bottom ring is fixedly installed at the bottom end of the filter cover. The bottom ring fits against the inner wall of the dust collection tank. A number of filter holes are formed through the side wall of the filter cover. Only gas is allowed to pass through the filter holes.

[0012] Preferably, the lower end of the dust collection tank is connected to the inside of a waste water tank through a waste water pipe. A valve is installed on the waste water pipe. The inside of the dust collection tank is connected to the inside of a water storage tank through a connecting pipe. A water pump is installed on the connecting pipe. The water pump is electrically connected to the inductor.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. In the present invention, the cleaning structure and the dust collection structure cooperate with each other. The second motor drives the glass cover to rotate, and at the same time, the rubber squeegee closely adheres to the outer wall of the glass cover, effectively scraping off the dust and stains attached to the glass cover. As the glass cover rotates, the third driven gear rotates with the second driven gear, driving the fan to generate suction inside the elbow pipe, so that the dust is sucked into the dust suction port, enters the S-shaped pipe through the dust suction pipe, and enters the dust collection tank unidirectionally due to the action of the one-way air outlet valve. This not only ensures the cleanliness of the glass cover surface, which is beneficial for people to view the model inside the glass cover, but also effectively prevents the backflow and leakage of dust, ensuring the efficiency and safety of the dust collection process, and at the same time ensuring that people can always clearly observe the model details without being disturbed by stains.

[0015] 2. In the present invention, through the cooperation of the fan, the filter cover, the sensor, the water pump and the valve, the strong suction generated by the fan inside the elbow pipe, in cooperation with the dust suction port and the dust suction pipe, can quickly suck the dust and stains on the glass cover into the dust collection tank; the setting of the filter cover effectively filters the inhaled dust and stains, preventing the secondary pollution of the environment by fine particles and ensuring the dust collection effect; as time goes by, dust will gradually accumulate inside the filter cover and cause the filter holes to be blocked. When the suction of the fan pulls the blocked filter cover up until it contacts the sensor on the fixed ring and the first limit ring, the sensor will immediately send a signal to the water pump to instruct it to start working. The water pump then injects cleaning water into the dust collection tank through the connecting pipe to clean the filter cover; after the cleaning process is completed, the sensor will send a stop signal to the water pump again to instruct it to stop working. At the same time, the valve is automatically opened, so that the waste water in the dust collection tank can be smoothly discharged into the waste water tank through the waste water pipe, thus completing the entire cleaning and drainage process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention.

[0017] Figure 2 It is a schematic structural diagram inside the present invention.

[0018] Figure 3 It is a schematic structural diagram inside the glass cover of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the connection between the dust collection tank, the waste water tank and the water storage tank of the present invention.

[0020] Figure 5 It is a schematic structural diagram of the inside of the dust collection tank and the elbow pipe of the present invention.

[0021] Figure 6 It is a schematic structural diagram of the filter cover of the present invention.

[0022] Annotation of reference numerals: 1. Bottom box; 11. Box door; 12. Bottom cavity; 13. Top cavity; 14. Controller; 15. Inductive probe; 16. Glass cover; 17. Arc block; 18. Rubber squeegee; 2. Display structure; 21. Motor I; 22. Driving gear I; 23. Driven gear I; 24. Multi-stage telescopic rod; 25. Placing seat; 3. Cleaning structure; 31. Motor II; 32. Driving gear II; 33. Driven gear II; 4. Dust collection structure; 401. Dust suction port; 402. Dust suction pipe; 403. S-shaped pipe; 404. Dust collection tank; 405. Dust discharge pipe; 406. Limit ring I; 407. Inductor; 408. One-way air outlet valve; 409. Limit ring II; 410. Air pipe; 411. Elbow pipe; 412. Filter plate; 413. Driven gear III; 414. Fixed rod; 415. Fan; 5. Filter cover; 51. Filter hole; 52. Bottom ring; 53. Fixed cylinder; 54. Fixed ring; 6. Waste water tank; 61. Waste water pipe; 62. Valve; 7. Water storage tank; 71. Connecting pipe; 72. Water pump. Detailed implementation mode

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] In one embodiment, as Figures 1-6 shown, a three-dimensional model interactive demonstration device includes a bottom box 1. The bottom box 1 is successively provided with a bottom cavity 12 and a top cavity 13 from top to bottom. Box doors 11 are hingedly installed at both the front and rear ends of the bottom box 1. A display structure 2 is arranged inside the bottom cavity 12.

[0025] The display structure 2 includes a motor I 21 installed inside the bottom cavity 12. The output end of the motor I 21 is fixedly connected to a driving gear I 22. The driving gear I 22 is meshed with a driven gear I 23. A multi-stage telescopic rod 24 is fixed to the upper end of the driven gear I 23. A placing seat 25 for placing a model is fixed to the telescopic end of the multi-stage telescopic rod 24. A glass cover 16 is arranged outside the placing seat 25. The glass cover 16 is rotatable relative to the bottom box 1. The bottom end of the glass cover 16 is connected to a cleaning structure 3. Inductive probes 15 are symmetrically installed on both sides of the front end of the bottom box 1. The inductive probes 15 are electrically connected to a controller 14. The controller 14 is installed at the right end of the bottom box 1. The controller 14 is electrically connected to the motor I 21 and the multi-stage telescopic rod 24.

[0026] In this embodiment, when the device is in an unstarted state, the box door 11 of the bottom box 1 is closed, and the glass cover 16 covers the placing seat 25 and the model thereon, protecting the model from external interference. The multi-stage telescopic rod 24 is at its initial length, and the model is stably placed on the placing seat 25.

[0027] When demonstrating the device, the multi-stage telescopic rod 24 adjusts the height of the placement seat 25 and the upper model until the model enters the inside of the glass cover 16.

[0028] When the audience approaches the device, the induction probe 15 detects a signal and sends it to the controller 14. The controller 14 controls the start of the first motor 21 according to a preset program, drives the first driving gear 22 to rotate, further drives the first driven gear 23 to act, and further drives the placement seat 25 and the upper model to rotate. The all-round display of the three-dimensional model improves the interactive effect.

[0029] In an optional embodiment, the cleaning structure 3 includes a second motor 31 installed inside the bottom cavity 12. The second motor 31 is electrically connected to the controller 14. The output end of the second motor 31 extends into the top cavity 13 and is fixedly connected to the second driving gear 32. The second driving gear 32 is meshed with the second driven gear 33. The second driven gear 33 is rotatably connected to the placement seat 25. A glass cover 16 is fixed to the upper end of the second driven gear 33. An arc-shaped block 17 is arranged behind the glass cover 16. The arc-shaped block 17 is fixed to the upper end of the bottom box 1. A rubber scraping plate 18 that fits the outer wall of the glass cover 16 is fixed to one end of the arc-shaped block 17 close to the glass cover 16. A dust collection structure 4 is arranged inside the bottom cavity 12.

[0030] It should be noted that the controller 14 can control the start and stop of the second motor 31. When the second motor 31 starts, it drives the second driving gear 32 to rotate. The second driving gear 32 is meshed with the second driven gear 33. Therefore, when the second driving gear 32 rotates, it drives the second driven gear 33 to rotate. The second driven gear 33 drives the glass cover 16 to rotate. When the glass cover 16 rotates, the rubber scraping plate 18 scrapes off the dust or stains on the outer wall of the glass cover 16.

[0031] In an alternative embodiment, the dust collection structure 4 includes a dust suction port 401 which is opened at one end of the arc-shaped block 17 close to the glass cover 16. The dust suction port 401 is located on the right side of the rubber squeegee 18. A dust suction pipe 402 is installed at the lower end of the arc-shaped block 17. The inside of the dust suction port 401 is connected to one end of an S-shaped pipe 403 through the dust suction pipe 402. The other end of the S-shaped pipe 403 extends into the dust collection tank 404 to fix a dust discharge pipe 405. A one-way air outlet valve 408 is installed inside the S-shaped pipe 403. The inside of the dust collection tank 404 is connected to the inside of an elbow pipe 411 through an air pipe 410. The elbow pipe 411 is fixed to the upper end of the bottom box 1. The pipe orifice of the air pipe 410 located inside the dust collection tank 404 is higher than the connection position of the S-shaped pipe 403 and the dust discharge pipe 405. The bottom end of the elbow pipe 411 extends into the top cavity 13 to rotate with a third driven gear 413. The third driven gear 413 meshes with a second driven gear 33. The upper end of the third driven gear 413 is fixedly connected to a fan 415 through a fixing rod 414. The fan 415 is located inside the elbow pipe 411. A filter plate 412 is installed at the other end of the elbow pipe 411.

[0032] It should be noted that when the glass cover 16 rotates and drives the rubber squeegee 18 to scrape off the dust on the outer wall, the third driven gear 413 rotates with the second driven gear 33, driving the fan 415 to generate suction inside the elbow pipe 411. The suction of the fan 415 acts on the inside of the dust collection tank 404 through the air pipe 410, causing the dust to be sucked into the dust suction port 401. The dust enters the S-shaped pipe 403 through the dust suction pipe 402 and enters the dust collection tank 404 unidirectionally due to the action of the one-way air outlet valve 408. The filtered air is discharged through the filter plate 412, preventing the dust from entering the inside of the bottom box 1 again or polluting the environment.

[0033] The design of the S-shaped pipe 403 and the one-way air outlet valve 408 is to reduce the dust backflow and improve the dust collection efficiency.

[0034] In an alternative embodiment, a first limiting ring 406 is fixed to the outer wall of the S-shaped pipe 403. An inductor 407 is arranged at the bottom end of the first limiting ring 406. A second limiting ring 409 is fixed to the outer wall of the bottom end of the dust discharge pipe 405. A filter cover 5 is arranged between the first limiting ring 406 and the second limiting ring 409. A fixing cylinder 53 is fixed to the upper end of the filter cover 5. The inner walls of the filter cover 5 and the fixing cylinder 53 slide on the outer walls of the S-shaped pipe 403 and the dust discharge pipe 405. A fixing ring 54 is fixed to the top end of the outer wall of the fixing cylinder 53. The fixing ring 54 matches the first limiting ring 406. A bottom ring 52 is fixed to the bottom end of the filter cover 5. The bottom ring 52 fits on the inner wall of the dust collection tank 404. A number of filter holes 51 are formed through the side wall of the filter cover 5, and only gas is allowed to pass through the filter holes 51.

[0035] It should be noted that when the dust collection structure 4 is working, the gas and a small amount of dust particles discharged from the S-shaped pipe 403 enter the filter cover 5. Due to the size limitation of the filter holes 51, only the gas can pass through the filter holes 51 and enter the internal space of the dust collection tank 404, while the dust particles are blocked inside the filter cover 5.

[0036] In an alternative embodiment, the lower end of the dust collection tank 404 is connected to the inside of the waste water tank 6 through a waste water pipe 61. A valve 62 is installed on the waste water pipe 61. The inside of the dust collection tank 404 is connected to the inside of the water storage tank 7 through a connecting pipe 71. A water pump 72 is installed on the connecting pipe 71. The water pump 72 is electrically connected to the sensor 407.

[0037] It should be noted that as time goes by, a certain amount of dust will accumulate inside the filter cover 5, and the dust will block the filter holes 51. The suction force of the fan 415 will pull the blocked filter cover 5 upward until the fixing ring 54 contacts the sensor 407 at the bottom of the limiting ring 406. Subsequently, a signal will be sent to the water pump 72 to instruct the water pump 72 to start working. The water pump 72 will then supply cleaning water to the dust collection tank 404 through the connecting pipe 71. After the cleaning is completed, the sensor 407 may send a signal to the water pump 72 again to instruct it to stop working. At the same time, the valve 62 is opened to allow the waste water in the dust collection tank 404 to be discharged into the waste water tank 6 through the waste water pipe 61.

[0038] The above embodiment discloses a three-dimensional model interactive demonstration device. Among them, when the device is not started, the box door 11 is closed to protect the model from external interference. The multi-stage telescopic rod 24 is at its initial length, stably supporting the placement seat 25 and the model thereon.

[0039] The multi-stage telescopic rod 24 adjusts the height of the placement seat 25 and the model until the model enters the inside of the glass cover 16. When the audience approaches the device, the induction probe 15 detects the signal and sends it to the controller 14. The controller 14 starts the first motor 21 according to the preset program, drives the first driving gear 22 to rotate, and then drives the first driven gear 23 and the placement seat 25 to rotate to display the three-dimensional model in all directions.

[0040] The controller 14 controls the second motor 31 to start, driving the second driving gear 32 to rotate. The second driving gear 32 meshes with the second driven gear 33 to drive the glass cover 16 to rotate. When the glass cover 16 rotates, the rubber squeegee 18 fits against the outer wall of the glass cover 16 to scrape off dust or stains.

[0041] At the same time, as the glass cover 16 rotates, the third driven gear 413 rotates with the second driven gear 33, driving the fan 415 to generate suction inside the elbow pipe 411, which causes the dust to be sucked into the dust suction port 401, enter the S-shaped pipe 403 through the dust suction pipe 402, and enter the dust collection tank 404 unidirectionally due to the effect of the one-way air outlet valve 408.

[0042] The filtered air is discharged through the filter plate 412 to prevent dust from entering the bottom box 1 again or polluting the environment.

[0043] Over time, dust accumulates inside the filter cover 5 and clogs the filter holes 51. The suction of the fan 415 pulls the clogged filter cover 5 upward until the fixing ring 54 contacts the sensor 407 at the bottom end of the limiting ring 1 406. The sensor 407 sends a signal to the water pump 72 to instruct it to start working. The water pump 72 provides cleaning water to the dust collection tank 404 through the connecting pipe 71. After the cleaning is completed, the sensor 407 sends a signal to the water pump 72 again to instruct it to stop working. At the same time, the valve 62 is opened to allow the waste water in the dust collection tank 404 to be discharged into the waste water tank 6 through the waste water pipe 61.

[0044] As described above, it is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A three-dimensional model interactive demonstration device, characterized in that It includes a bottom box (1). The bottom box (1) is provided with a bottom cavity (12) and a top cavity (13) in sequence from top to bottom. Both the front and rear ends of the bottom box (1) are hinged with a box door (11). A display structure (2) is arranged inside the bottom cavity (12). The display structure (2) includes a motor one (21) installed inside the bottom cavity (12). The output shaft of the motor one (21) is fixedly connected to a driving gear one (22). The driving gear one (22) is meshed with a driven gear one (23). A multi-stage telescopic rod (24) is fixedly installed at the upper end of the driven gear one (23). A placement seat (25) for placing a model is fixedly installed at the telescopic end of the multi-stage telescopic rod (24). A glass cover (16) is arranged outside the placement seat (25). The glass cover (16) is rotatable with respect to the bottom box (1). The bottom end of the glass cover (16) is connected to a cleaning structure (3). On both sides of the front end of the bottom box (1), induction probes (15) are symmetrically installed. The induction probes (15) are electrically connected to a controller (14). The controller (14) is installed at the right end of the bottom box (1). The controller (14) is electrically connected to the motor one (21) and the multi-stage telescopic rod (24).

2. The three-dimensional model interactive demonstration device according to claim 1, wherein The cleaning structure (3) includes a motor two (31) installed inside the bottom cavity (12). The motor two (31) is electrically connected to the controller (14). The output end of the motor two (31) extends into the top cavity (13) and is fixedly connected to a driving gear two (32). The driving gear two (32) is meshed with a driven gear two (33). The driven gear two (33) is rotatable with respect to the placement seat (25). A glass cover (16) is fixedly installed at the upper end of the driven gear two (33). An arc-shaped block (17) is arranged behind the glass cover (16). The arc-shaped block (17) is fixed to the upper end of the bottom box (1). A rubber scraping plate (18) that fits against the outer wall of the glass cover (16) is fixed to one end of the arc-shaped block (17) close to the glass cover (16). A dust collection structure (4) is arranged inside the bottom cavity (12).

3. The three-dimensional model interactive demonstration device according to claim 2, characterized in that, The dust collection structure (4) includes a dust suction port (401) which is opened at one end of the arc block (17) close to the glass cover (16). The dust suction port (401) is located on the right side of the rubber squeegee (18). A dust suction pipe (402) is installed at the lower end of the arc block (17). The inside of the dust suction port (401) is connected to one end of an S-shaped pipe (403) through the dust suction pipe (402). The other end of the S-shaped pipe (403) extends into the dust collection tank (404) and is fixed to the dust discharge pipe (405). A one-way air outlet valve (408) is installed inside the S-shaped pipe (403). The inside of the dust collection tank (404) is connected to the inside of an elbow pipe (411) through an air pipe (410). The elbow pipe (411) is fixed to the upper end of the bottom box (1). The pipe orifice of the air pipe (410) inside the dust collection tank (404) is higher than the connection position of the S-shaped pipe (403) and the dust discharge pipe (405). The bottom end of the elbow pipe (411) extends into the top cavity (13) and rotates with the third driven gear (413). The third driven gear (413) meshes with the second driven gear (33). The upper end of the third driven gear (413) is fixedly connected to a fan (415) through a fixing rod (414). The fan (415) is located inside the elbow pipe (411). A filter plate (412) is installed at the other end of the elbow pipe (411).

4. The three-dimensional model interactive demonstration device according to claim 3, wherein, A first limiting ring (406) is fixed to the outer wall of the S-shaped pipe (403). An inductor (407) is arranged at the bottom end of the first limiting ring (406). A second limiting ring (409) is fixed to the outer wall at the bottom end of the dust discharge pipe (405). A filter cover (5) is arranged between the first limiting ring (406) and the second limiting ring (409). A fixing cylinder (53) is fixed to the upper end of the filter cover (5). The inner walls of the filter cover (5) and the fixing cylinder (53) slide on the outer walls of the S-shaped pipe (403) and the dust discharge pipe (405). A fixing ring (54) is fixed to the top end of the outer wall of the fixing cylinder (53). The fixing ring (54) matches the first limiting ring (406). A bottom ring (52) is fixed to the bottom end of the filter cover (5). The bottom ring (52) fits on the inner wall of the dust collection tank (404). A number of filter holes (51) are formed through the side wall of the filter cover (5), and only gas is allowed to pass through the filter holes (51).

5. A three-dimensional model interactive demonstration device according to claim 4, characterized in that, The lower end of the dust collection tank (404) is communicated with the inside of a waste water tank (6) through a waste water pipe (61). A valve (62) is installed on the waste water pipe (61). The inside of the dust collection tank (404) is communicated with the inside of a water storage tank (7) through a connecting pipe (71). A water pump (72) is installed on the connecting pipe (71). The water pump (72) is electrically connected to the inductor (407).

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