Retrofit Toilet Seat Mechanism CAD Design -- 2

Hello,

We are working on a retrofit toilet seat mechanism and are looking for a CAD designer to convert a fully-defined mechanical concept into manufacturable CAD models and drawings.

*Project Overview*

The product is a spring-biased toilet seat ring lifting mechanism that:

Keeps the seat ring upright by default

Allows manual pull-down without snap-back

Is fully retrofit on standard ceramic WCs

Does not interfere with the lid

Uses a torsion spring + cam/lifting arm (no motors)

*What I Will Provide*

A complete CAD handoff ZIP (concept diagrams, interfaces, constraints)

*Dimensional references*

Hinge shaft → seat ring inner edge ≈ 9 cm

Cam interaction width on seat ring limited to 2 inches

Retrofit constraints (existing WC mounting holes, seat freedom)

*Scope of Work*

Create parametric CAD models for:

Mounting bracket

Hinge shaft

Torsion spring (spec-level)

Cam / lifting arm (2-part adjustable design)

Ensure:

Seat ring remains free-rotating

Cam provides lifting torque only

No over-travel beyond seat inner diameter

Deliver:

STEP files (manufacturing)

STL files (prototyping)

Assembly & exploded views

Motion simulation screenshots

Basic 2D workshop drawings

3D animation for working principle

*Key Design Constraints*

Must sit flush on ceramic WC surface

No increase in rear seat height

No snap-back (controlled return via friction/damping)

Simple, low-part-count design preferred

*Manufacturing Intent*

Materials: SS, glass-filled nylon, spring steel

Processes: CNC / injection molding

Designed for small-batch manufacturing

*Please confirm*


Relevant experience

Estimated timeline

Commercial terms

Once confirmed, I will immediately share the full CAD handoff package.

Best regards,
Sumit Thakral
Vsecure TechMax