SPRiT  -  MX  Complex Rate Springs      -    World Premier since Mar 20,  2020
    
Complex Rate v4.3  =  Progressive + Linear  
 
 
I have designed these Complex rate springs to be much lighter than normal springs by 5g - 7g until the actuation point by progressive rate as Graph 1.   
The force rises by linear rate after the actuation, results in the same bottom out weight as the conventional linear springs.  
Complex rate springs are hard to find any example in the electronics industry, the production is trickier and needs lots of setups. 
  
Please Enjoy Your World Premier Build! 
Mar 20, 2020  -  in the middle of decameronic pandemic - 
SPRiT 
 
* No Polarity on Complex rate springs.  
  According to Newton,   Fab  =  - Fba 
  
 
Bottom out Force                Force ratio Before vs After actuation
 
63.5 C  (Actuation 43cN)  -  Force ratio  =  3 : 4   In Stock 
 
68 C     (Actuation 47cN)  -  Force ratio  =  3 : 4   In Stock
 
72 C     (Actuation 50cN)  -  Force ratio  =  3 : 4   In Stock
 
78 C     (Actuation 53cN)  -  Force ratio  =  3 : 4   In Stock 
 
For more info  >   spritdesigns.com/mx