Multidirectional video monitoring mechanism

Abstract

The utility model discloses a multidirectional video monitoring mechanism, which belongs to the technical field of video monitoring, and comprises a fixed support, a sliding chute A, a sliding frame A, a sliding chute B, a sliding frame B, a support frame, a holder and a monitoring camera, the sliding chute A is embedded below the fixed support, the sliding frame A is slidably arranged below the sliding chute A through a sliding block, the sliding chute B is embedded below the sliding frame A, and the sliding chute B is embedded below the sliding frame A through a sliding block. And a sliding frame B is slidably arranged below the interior of the sliding groove B through a sliding block. A limiting block B is extruded to drive a damping telescopic rod B and an outer side spring to contract, after a plug pin is pulled to slide out of a limiting clamping groove, a monitoring camera is pushed to drive an installation frame to slide out of an installation groove to complete disassembly and maintenance, and then a worker clamps and installs the monitoring camera in the same mode. The monitoring camera can be conveniently and rapidly disassembled and maintained by a worker, and the situation that the monitoring processing of a corridor is affected due to the fact that the disassembly and assembly of the monitoring camera wastes too much time can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of video monitoring, in particular to a multi-directional video monitoring mechanism. Background Art

[0002] Video surveillance is composed of lenses, controllers, lights, displays and video outputs. Images are collected through cameras. The video signals collected by the cameras are transmitted to the receiving end through connecting lines and are used to view images for monitoring through matching displays.

[0003] Among them, after searching, it was found that the application number is CN202320480941.4, a monitoring auxiliary adjustment mechanism, which has a dovetail groove, a threaded rod, and a slider arranged in the fixed rod. During the installation process, the staff fixes the mechanism in a suitable position and rotates the threaded rod to adjust the position of the monitoring camera. During use, the staff of this design will not have the fixed position wrong, and then install the monitoring camera. This design is more convenient during the installation process; Among them, the shortcomings are as follows:

[0004] When the staff uses this monitoring auxiliary adjustment mechanism to adjust the position of the monitoring camera, they rotate the threaded rod, the threaded rod drives the slider to slide, the slider drives the support plate, and the support plate drives the monitoring camera. When the slider slides in the front of the dovetail groove to adjust the position, since the monitoring camera is located below the support plate and the fixing rod is vertically installed on the wall perpendicular to the ground, the monitoring camera with a single up and down adjustment position cannot effectively increase the monitoring range, so that the monitoring range of this monitoring auxiliary adjustment mechanism is small, resulting in low monitoring efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a multi-directional video monitoring mechanism in order to solve the problem that the monitoring range of the above-mentioned monitoring auxiliary adjustment mechanism is small, resulting in low monitoring efficiency.

[0006] The technical solution adopted by the utility model is as follows: a multi-directional video monitoring mechanism, including a fixed bracket, a slide groove A, a sliding frame A, a slide groove B, a sliding frame B, a support frame, a pan-tilt and a monitoring camera, wherein the fixed bracket is embedded with a slide groove A at the bottom, the sliding frame A is slidably arranged at the bottom of the slide groove A, the slide groove B is embedded with a slide frame A at the bottom, the sliding frame B is slidably arranged at the bottom of the slide groove B, a support frame is rotatably arranged at the bottom of the sliding frame B through a bearing, a pan-tilt is rotatably arranged at the bottom of the support frame through a bearing, a monitoring camera is arranged above the pan-tilt, a limit clamping mechanism for convenient disassembly and assembly of the monitoring camera is arranged above the pan-tilt, a sliding adjustment mechanism for convenient adjustment of the monitoring position by the staff is arranged at the bottom of the fixed bracket, and a swing monitoring mechanism for increasing the monitoring range of the monitoring camera is arranged on the inner side of the sliding frame A.

[0007] The limit card connection mechanism is composed of a mounting bracket, a mounting slot, a limit slot B, a damping telescopic rod B, a limit block B, a latch, a limit slot C, a mounting frame and a limit card slot. A mounting bracket is rotatably arranged above the pan / tilt via a damping shaft, a mounting slot is embedded on the side of the mounting bracket, a mounting frame is fixedly installed below the surveillance camera, and the mounting frame is slidingly arranged on the inner side of the mounting slot, a limit slot B is embedded on the side of the mounting bracket close to the side of the mounting slot, and a limit card slot is embedded on the side of the mounting frame. The limit slot is set in an "L" shape, a pin is slidably arranged between the limit slot B and the inner side of the limit slot, and the pin is set in an "L" shape, limit slots C are embedded on both sides above the pin, and the limit slot C is set in an arc shape, damping telescopic rods B are fixedly installed on both sides above the inner wall of the limit slot B, and a spring is matched on the outside of the damping telescopic rod B, a limit block B is fixedly installed below the end of the damping telescopic rod B, and the limit block B is set in an arc shape, and the limit block B is slidably arranged on the inner side of the limit slot C.

[0008] Among them, the sliding adjustment mechanism is composed of a limit groove A, a damping telescopic rod A and a limit block A. The limit groove A is embedded on the inner wall of the slide groove A. There are several limit grooves A, which are arranged equidistantly in parallel in an arc shape. The damping telescopic rod A is fixedly installed on both sides above the sliding frame A, and a spring is matched on the outside of the damping telescopic rod A. The limit block A is fixedly installed above the end of the damping telescopic rod A, and the limit block A is arranged in an arc shape, and the limit block A fits and slides on the inner side of the limit groove A.

[0009] Among them, the swing monitoring mechanism is composed of teeth, electric rollers and gears. Teeth are fixedly installed on the front of the inner wall of the sliding frame A. There are several teeth, which are arranged in parallel and equidistantly in a trapezoidal shape. Gears are fixedly installed on the top of the support frame, and the matching teeth on the outer ring of the gear and several teeth are arranged in a bite transmission arrangement. Electric rollers are rotatably arranged on both sides of the front and rear of the sliding frame B through bearings, and the electric rollers are slidingly arranged on the inner side of the slide groove B.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0011] 1. This multi-directional video surveillance mechanism is provided with a limited card connection mechanism, so that the staff can coordinate between the mounting bracket, the mounting slot, the limit slot B, the damping telescopic rod B, the limit block B, the latch, the limit slot C, the mounting frame and the limit card slot, and use the limit block B to slide freely on the inner side of the limit slot C through the damping telescopic rod B and the outer spring to limit the latch, which is convenient for the staff to quickly disassemble and maintain the surveillance camera, and can avoid wasting too much time on the disassembly and assembly of the surveillance camera and affecting the monitoring of the corridor.

[0012] 2. This multi-directional video surveillance mechanism is equipped with a sliding adjustment mechanism, which allows the staff to cooperate between the limit slot A, the damping telescopic rod A and the limit block A, and use the limit block A to freely slide and limit inside a number of limit slots A through the damping telescopic rod A and the outer spring, and freely adjust the position of the sliding frame A, so that the staff can freely adjust the monitoring position of the surveillance camera, which is suitable for use in "U"-shaped corridors of different specifications.

[0013] 3. This multi-directional video surveillance mechanism is provided with a swinging monitoring mechanism, which enables the staff to cooperate with the teeth, electric rollers and gears, and use the electric rollers to repeatedly rotate on the inside of the slide groove B, thereby driving the gears and several teeth on the upper side of the sliding frame B to engage and transmit, and drive the monitoring camera to repeatedly swing half a circle clockwise and half a circle counterclockwise, thereby increasing the monitoring range of the monitoring camera for efficient monitoring processing and improving the effect of repeated multi-directional efficient monitoring processing of the monitoring camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of the monitoring mechanism of the utility model;

[0015] Figure 2 This is a schematic diagram of the monitoring mechanism of the utility model in front view in a state of use;

[0016] Figure 3 For the utility model Figure 2 The enlarged schematic diagram of the structure at A in the middle;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the sliding frame A in the utility model;

[0018] Figure 5 For the utility model Figure 2 The enlarged schematic diagram of the structure at B in the middle;

[0019] Figure 6 For the utility model Figure 5 The enlarged schematic diagram of the structure at C in the middle;

[0020] Figure 7 For the utility model Figure 5 The enlarged structural schematic diagram of Example 2 is shown at C in the middle.

[0021] Markings in the figure: 1. Fixed bracket; 101. Slide groove A; 102. Limiting groove A; 103. Sliding frame A; 104. Damping telescopic rod A; 105. Limiting block A; 106. Teeth; 2. Slide groove B; 201. Sliding frame B; 202. Electric roller; 203. Support frame; 204. Gear; 205. Pan / tilt; 206. Mounting bracket; 207. Mounting groove; 3. Limiting groove B; 301. Damping telescopic rod B; 302. Limiting block B; 303. Latch; 304. Limiting groove C; 4. Surveillance camera; 401. Mounting frame; 402. Limiting slot. Implementation

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the utility model:

[0024] Example 1: Reference Figure 1-6A multi-directional video monitoring mechanism comprises a fixed bracket 1, a slide groove A101, a sliding frame A103, a slide groove B2, a sliding frame B201, a support frame 203, a pan-tilt head 205 and a monitoring camera 4, wherein the slide groove A101 is embedded below the fixed bracket 1, the sliding frame A103 is slidably arranged below the slide groove A101, the slide groove B2 is embedded below the sliding frame A103, the sliding frame B201 is slidably arranged below the slide groove B2, the support frame 203 is rotatably arranged below the sliding frame B201, the pan-tilt head 205 is rotatably arranged below the support frame 203, the monitoring camera 4 is arranged above the pan-tilt head 205, a limit clamping mechanism for convenient disassembly and assembly of the monitoring camera is arranged above the pan-tilt head 205, a sliding adjustment mechanism for convenient adjustment of the monitoring position by the staff is arranged below the fixed bracket 1, and a swing monitoring mechanism for increasing the monitoring range of the monitoring camera is arranged inside the sliding frame A103.

[0025] Reference Figure 1 , 2 , 5, 6, further, the limit clamping mechanism is composed of a mounting bracket 206, a mounting slot 207, a limit slot B3, a damping telescopic rod B301, a limit block B302, a latch 303, a limit slot C304, a mounting bracket 401 and a limit clamping slot 402;

[0026] A mounting bracket 206 is provided above the pan / tilt head 205 through a damping shaft for rotation, and a mounting slot 207 is embedded on the side of the mounting bracket 206. A mounting frame 401 is fixedly installed below the surveillance camera 4, and the mounting frame 401 is slidably arranged on the inner side of the mounting slot 207. A limiting slot B3 is embedded on the side of the mounting bracket 206 near the side of the mounting slot 207. A limiting card slot 402 is embedded on the side of the mounting frame 401, and the limiting card slot 402 is arranged in an "L" shape. A latch 303 is slidably arranged between the limiting slot B3 and the inner side of the limiting card slot 402, and the latch 303 is in an "L" shape. " shape, limited slots C304 are embedded on both sides above the latch 303, and the limited slots C304 are set in an arc shape, damping telescopic rods B301 are fixedly installed on both sides above the inner wall of the limited slot B3, and a spring is matched on the outside of the damping telescopic rod B301, and a limited block B302 is fixedly installed below the end of the damping telescopic rod B301, and the limit block B302 is set in an arc shape, and the limit block B302 is slidingly set on the inside of the limit slot C304. When the staff needs to install the surveillance camera 4 in the "U"-shaped corridor in the building, the fixed bracket 1 is screwed in After the bolt is fixed to the roof in the middle of the "U"-shaped corridor, slide the mounting bracket 401 below the surveillance camera 4 into the mounting slot 207, slide the latch 303 into between the limit slot B3 and the inner side of the limit card slot 402, squeeze the limit block B302 to drive the damping telescopic rod B301 and the outer spring to contract, so that the "L"-shaped latch 303 is completely fitted and connected to the inner side of the limit card slot 402, and the damping telescopic rod B301 and the outer spring pop out the limit block B302 to slide into the inner side of the limit slot C304 to limit and fix the latch 303, completing the installation of the surveillance camera 4 and performing long-term use. When regular disassembly and maintenance are required, push the pin 303 upward to loosen it from the "L" shaped limit slot 402, and squeeze the limit block B302 to drive the damping telescopic rod B301 and the outer spring to contract. After pulling the pin 303 out of the limit slot 402, push the surveillance camera 4 to drive the mounting frame 401 to slide out of the mounting slot 207. After disassembly and maintenance are completed, the staff can then card-connect and install the surveillance camera 4 in the same way, which is convenient for the staff to quickly disassemble and maintain the surveillance camera 4, and can avoid wasting too much time on the disassembly and installation of the surveillance camera 4 and affecting the monitoring of the corridor.

[0027] Reference Figure 2-3 , further, the sliding adjustment mechanism is composed of a limit groove A102, a damping telescopic rod A104 and a limit block A105;

[0028] A limiting groove A102 is embedded on the inner wall of the slide groove A101. There are several limiting grooves A102, which are arranged in parallel and equidistantly in an arc shape. Damping telescopic rods A104 are fixedly installed on both sides of the upper side of the sliding frame A103, and a spring is matched on the outer side of the damping telescopic rod A104. A limiting block A105 is fixedly installed on the upper end of the damping telescopic rod A104, and the limiting block A105 is arranged in an arc shape, and the limiting block A105 fits and slides on the inner side of the limiting groove A102. When the staff installs the monitoring camera 4, the sliding frame A103 is pushed through the slide. The block slides under the inside of the slide slot A101, and the squeeze limit block A105 slides out of the limit slot A102, driving the damping telescopic rod A104 and the outer spring to contract. After adjusting the surveillance camera 4 to a suitable monitoring position, the damping telescopic rod A104 and the outer spring pop-up limit block A105 slide into the inner side of one of the relative limit slots A102. After limiting the sliding frame A103 as a whole, the monitoring position adjustment of the surveillance camera 4 is completed, which is convenient for the staff to freely adjust the monitoring position of the surveillance camera 4 to be suitable for use in "U"-shaped corridors of different specifications.

[0029] Reference Figure 2-4 , further, the swing monitoring mechanism is composed of teeth 106, electric roller 202 and gear 204;

[0030] A tooth 106 is fixedly installed in front of the inner wall of the sliding frame A103. There are several teeth 106, which are arranged in parallel in a trapezoidal shape and at equal distances. A gear 204 is fixedly installed on the top of the support frame 203, and the teeth matched with the outer ring of the gear 204 and the several teeth 106 are arranged in a bite transmission arrangement. The front and rear sides of the sliding frame B201 are both provided with electric rollers 202 that are rotatable through bearings, and the electric rollers 202 are arranged in a sliding manner on the inner side of the slide groove B2. When the staff adjusts the monitoring camera 4 to a suitable monitoring position, the servo motors matched with the monitoring camera 4 and the electric rollers 202 are turned on for a long time. During the monitoring process, the servo motor matched with the electric roller 202 will drive the electric roller 202 to rotate repeatedly clockwise and counterclockwise on the inner side of the slide groove B2, driving the sliding frame B201 to slide repeatedly on the inner side of the slide groove B2, while driving the gear 204 and several teeth 106 to engage and transmit, pushing the gear 204 to drive the support frame 203 to rotate slowly through the bearing, driving the monitoring camera 4 to swing repeatedly clockwise half a circle and counterclockwise half a circle, thereby increasing the monitoring range of the monitoring camera 4 for efficient monitoring and processing, and improving the effect of repeatedly performing multi-directional and efficient monitoring and processing on the monitoring camera 4.

[0031] Reference Figure 1-3 Furthermore, the electric roller 202 is electrically connected to the battery through a matching servo motor and a control panel, and the surveillance camera 4 is electrically connected to the battery through the control panel. Example

[0032] like Figure 6 , 7 As shown, in addition to the embodiment in which the utility model is provided with limiting grooves C304 embedded on both sides above the latch 303, and the limiting grooves C304 are arranged in an arc shape, damping telescopic rods B301 are fixedly installed on both sides above the inner wall of the limiting groove B3, and a spring is arranged on the outer side of the damping telescopic rod B301, and a limiting block B302 is fixedly installed below the end of the damping telescopic rod B301, and the limiting block B302 is arranged in an arc shape, and the limiting block B302 is slidingly arranged on the inner side of the limiting groove C304, there is another embodiment in which limiting grooves C304 are embedded on both sides above the latch 303, and the limiting grooves C304 are arranged in a trapezoidal shape, damping telescopic rods B301 are fixedly installed on both sides above the inner wall of the limiting groove B3, and a spring is arranged on the outer side of the damping telescopic rod B301, and the end of the damping telescopic rod B301 A limit block B302 is fixedly installed at the bottom, and the limit block B302 is set in a trapezoidal shape, and the limit block B302 is slidably set on the inner side of the limit slot C304. When the staff slides the pin 303 between the limit slot B3 and the inner side of the limit card slot 402, the limit block B302 is squeezed to drive the damping telescopic rod B301 and the outer spring to contract, so that the "L"-shaped pin 303 is completely fitted and connected to the inner side of the limit card slot 402, and the damping telescopic rod B301 and the outer spring pop out the trapezoidal limit block B302 and slide into the inner side of the trapezoidal limit slot C304, which will create a larger contact area between the trapezoidal limit slot C304 and the trapezoidal limit block B302, and the pin 303 will be more stably limited and fixed, completing the installation of the surveillance camera 4. Compared with the first embodiment, the limit and fixation effect is better.

[0033] Working principle: First, the staff needs to install the surveillance camera 4 in the "U"-shaped corridor in the building. When using it, fix the fixing bracket 1 to the roof in the middle of the "U"-shaped corridor with bolts, slide the mounting bracket 401 below the surveillance camera 4 into the mounting slot 207, slide the latch 303 into the space between the limit slot B3 and the inner side of the limit card slot 402, squeeze the limit block B302 to drive the damping telescopic rod B301 and the outer spring to contract, so that the "L"-shaped latch 303 is completely fitted and connected to the inner side of the limit card slot 402, and the damping telescopic rod B301 and the outer spring are elastic. The limit block B302 slides into the inner side of the limit slot C304 to limit and fix the latch 303, completing the installation of the surveillance camera 4. Then, the staff pushes the sliding frame A103 to slide under the inner side of the slide slot A101 through the slider, squeezes the limit block A105 to slide out of the limit slot A102, drives the damping telescopic rod A104 and the outer spring to contract, and after adjusting the surveillance camera 4 to a suitable monitoring position, the damping telescopic rod A104 and the outer spring pop out the limit block A105 to slide into the inner side of one of the relative limit slots A102, and the sliding frame A103 is integrally fixed. After the limit, the monitoring position adjustment of the monitoring camera 4 is completed. Finally, when the staff turns on the monitoring camera 4 and the servo motor matching the electric roller 202 for long-term monitoring, the servo motor matching the electric roller 202 will drive the electric roller 202 to repeatedly rotate several circles clockwise and several circles counterclockwise on the inner side of the slide groove B2, driving the sliding frame B201 to repeatedly slide on the inner side of the slide groove B2, while driving the gear 204 and several teeth 106 to engage and transmit, pushing the gear 204 to drive the support frame 203 to rotate slowly through the bearing, driving the monitoring camera 4 to rotate clockwise and counterclockwise. The surveillance camera 4 swings repeatedly by half a circle clockwise and half a circle counterclockwise to increase the surveillance range of the surveillance camera 4 for efficient surveillance processing. When it is used for a long time and needs regular disassembly and maintenance, the staff pushes the pin 303 upward to loosen it from the "L"-shaped limit slot 402, and squeezes the limit block B302 to drive the damping telescopic rod B301 and the outer spring to contract. After pulling the pin 303 out of the limit slot 402, the surveillance camera 4 is pushed to drive the mounting frame 401 to slide out of the mounting slot 207. After disassembly and maintenance are completed, the staff will then install the surveillance camera 4 in the same way.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-directional video monitoring mechanism, comprising a fixed bracket (1), a slide groove A (101), a sliding frame A (103), a slide groove B (2), a sliding frame B (201), a support frame (203), a pan-tilt head (205) and a monitoring camera (4), wherein the fixed bracket (1) is embedded with a slide groove A (101) below, the slide groove A (101) is slidably arranged below the slide groove A (101), the slide frame A (103) is embedded with a slide groove B (2) below the slide groove B (2), the slide frame B (201) is slidably arranged below the slide groove B (2), the support frame (203) is rotatably arranged below the slide frame B (201) via a bearing, the pan-tilt head (205) is rotatably arranged below the support frame (203) via a bearing, and the monitoring camera (4) is arranged above the pan-tilt head (205), Features: A limit clamping mechanism is arranged above the pan / tilt head (205) for facilitating the disassembly and assembly of the surveillance camera, a sliding adjustment mechanism is arranged below the interior of the fixed bracket (1) for facilitating the staff to adjust the monitoring position, and a swing monitoring mechanism is arranged inside the sliding frame A (103) for increasing the monitoring range of the surveillance camera.

2. A multi-directional video surveillance mechanism as claimed in claim 1, Features: The position-limiting clamping mechanism is composed of a mounting bracket (206), a mounting slot (207), a position-limiting slot B (3), a damping telescopic rod B (301), a position-limiting block B (302), a latch (303), a position-limiting slot C (304), a mounting bracket (401) and a position-limiting clamping slot (402); A mounting bracket (206) is rotatably arranged above the pan / tilt head (205) via a damping shaft, and a mounting groove (207) is embedded on the side of the mounting bracket (206). A mounting frame (401) is fixedly installed below the monitoring camera (4), and the mounting frame (401) is slidably arranged on the inner side of the mounting groove (207). A limiting groove B (3) is embedded on the side of the mounting bracket (206) near the side of the mounting groove (207), and a limiting card groove (402) is embedded on the side of the mounting frame (401). A latch (303) is slidably arranged between the inner side of the limit slot B (3) and the limit slot (402); limit slots C (304) are embedded on both sides above the latch (303); damping telescopic rods B (301) are fixedly installed on both sides above the inner wall of the limit slot B (3); and a spring is matchedly arranged on the outer side of the damping telescopic rod B (301); a limit block B (302) is fixedly installed below the end of the damping telescopic rod B (301); and the limit block B (302) is slidably arranged on the inner side of the limit slot C (304).

3. A multi-directional video surveillance mechanism as claimed in claim 1, Features: The sliding adjustment mechanism is composed of a limiting groove A (102), a damping telescopic rod A (104) and a limiting block A (105); A limiting groove A (102) is embedded on the inner wall of the slide groove A (101), damping telescopic rods A (104) are fixedly installed on both sides of the upper side of the sliding frame A (103), and a spring is matched with the outer side of the damping telescopic rod A (104), and a limiting block A (105) is fixedly installed on the upper side of the end of the damping telescopic rod A (104), and the limiting block A (105) is slidably arranged on the inner side of the limiting groove A (102).

4. A multi-directional video surveillance mechanism as claimed in claim 1, Features: The swing monitoring mechanism is composed of teeth (106), a motorized roller (202) and a gear (204); A tooth (106) is fixedly mounted on the front of the inner wall of the sliding frame A (103), a gear (204) is fixedly mounted on the top of the supporting frame (203), and the teeth matched with the outer ring of the gear (204) and the plurality of teeth (106) are arranged in a meshing transmission arrangement, and electric rollers (202) are rotatably arranged on both the front and rear sides of the sliding frame B (201) through bearings, and the electric rollers (202) are arranged in a sliding arrangement in a fitting manner on the inner side of the slide groove B (2).

5. A multi-directional video surveillance mechanism as claimed in claim 2, Features: The limiting slot (402) is arranged in an "L" shape, the latch (303) is arranged in an "L" shape, the limiting slot C (304) is arranged in an arc shape, and the limiting block B (302) is arranged in an arc shape.

6. A multi-directional video surveillance mechanism as claimed in claim 3, Features: There are a plurality of limit grooves A (102), which are arranged in parallel and equidistantly in an arc shape, and the limit blocks A (105) are arranged in an arc shape.

7. A multi-directional video surveillance mechanism as claimed in claim 4, Features: There are a plurality of teeth (106), which are arranged in parallel and at equal distances in a trapezoidal shape.

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