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Lowering Mechanism
Torsion Springs Reverse Cam Hydraulic Piston Clock Spring Padded Free Fall String
Torsion Springs
+ Easily made as bolt-on
- Weight may cause need for more resistance
- Torsion springs need to be very strong
Reverse Cam
+ Smooth motion+ Easily manufactured- Requires significant force- Will generate much wear
Hydraulic Piston
+ Easily regulates closing speed
- Not simple to “bolt-on”- Obtrusive and large- Possibly expensive
Clock Spring
+ Easily reset+ Easily incorporated
into seat design- Damping may be
difficult- Design by trial & error
StringUP DOWN
String attached to back of toilet and seat String goes taught
stopping the fall
+ Inexpensive- Easy to
break- may still slam- Uninteresting
Ball Maze
+ Very neat and fun+ Visually pleasing (if
Plexiglas idea is used- May be loud- Reset may be a
problem with manual override
- Seat may be too thick
Falling liquid/sand
Locking Pin
Pivot
Liquid Holding Tanks
+ Self contained- Seat may be too thick- May be difficult to
reset quickly- Locking pin may
complicate manual override
Falling Weights
+ Release and timing are integrated already
- May be obtrusive- Two different
orientations may cause problems
Locking Mechanism
Spring/Ball Bearing Lock Spring-loaded Pin Lever attached to seat Divot in Reverse Cam None (Equilibrium)
Divot in Reverse Cam
+ Smooth locking+ Easily overcome by
human means- Not easily overcome
mechanically