CAD Mobile Toilet Drawing Method

The steps for drawing a mobile toilet (public toilet urinal and urinal) in CAD are as follows:

Steps for Drawing Public Toilet Urinals

1. Draw the Basic Rectangle
   Use CAD's 'Rectangle' command to input dimensions of 240×425 and draw the main outline of the urinal. This rectangle serves as the core framework of the urinal, and its dimensions must be precisely controlled to ensure subsequent offset and fillet operations comply with design specifications.

2. Offset and Fillet Processing
   Use the 'Offset' command to offset the rectangle inward by 20 units, forming an internal boundary. Then, use the 'Fillet' command to set radii of 100 and 120, respectively, and fillet the four corners of the offset rectangle to make the edges transition naturally, conforming to ergonomic design.

3. Add Core Elements of the Urinal
   Use the 'Circle' command to draw a circle with a radius of 16 inside the filleted rectangle, representing the urinal's drain or flush button. Adjust its position to an appropriate location (such as the center-bottom area) using the 'Move' command to ensure a balance between functionality and aesthetics.

4. Draw Side Structures of the Urinal
   Use the 'Rectangle' command again to draw rectangles with dimensions of 75×240 on both sides of the main rectangle, serving as the urinal's baffles or support structures. Adjust the positions of these rectangles according to the actual layout to ensure alignment with the main structure.

5. Refine Graphic Details
   Use the 'Line' and 'Offset' commands to add auxiliary lines (such as dividing lines or stiffeners) inside the side rectangles to enhance structural stability. For example, you can offset parallel lines by 10 units inside the 75×240 rectangle to simulate baffle textures.

6. Mirror Copy to Complete Symmetrical Structure
   Use the 'Mirror' command to copy the completed urinal structure on one side to the other side, using the centerline of the main rectangle as the axis of symmetry, forming a complete double-urinal layout. Check whether the mirrored graphic completely coincides with the original structure to avoid errors.

Steps for Drawing Urinals

1. Draw the Basic Outline
   Use the 'Rectangle' tool to draw a rectangle with dimensions of width 406 and length 915, representing the main body of the urinal. Use the 'Fillet' command to set the corners of the rectangle to a radius of 100, simulating the curved design of the urinal's edges. Then, use the 'Arc' command to draw an arc with a radius of 76 at the bottom of the rectangle, forming the outline of the drain.

2. Offset to Generate Multi-layer Structures
   Use the 'Offset' command to offset the initial arc outward by 230 units, forming the first outer outline; then, offset it outward by another 45 units on this basis to generate the second outer outline. Ensure that the offset distances are accurate to avoid overlapping layers or excessive gaps.

3. Add Decorative Arcs
   Use the 'Arc' command to add arcs with smaller radii (such as 30-50 units) at the top of the outermost arc, forming decorative edges or splash-proof designs. Adjust the curvature of the arcs according to actual needs to ensure coordination with the overall style.

4. Trim Excess Lines
   Use the 'Trim' command to delete excess line segments at the intersections of different arcs, making the outline of the urinal clear. For example, trim the overlapping parts of the inner and outer arcs to retain effective boundaries and complete the final graphic.

Notes: During the drawing process, frequently use the 'Zoom' and 'Pan' commands to check details and ensure that all elements are proportionally coordinated. After completing the drawing, it is recommended to use the 'Layer' function to categorize and manage different components (such as the main body, drain, and decorative lines) for easy subsequent modifications or annotations.