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Retractile Cord Design

Coil Cords are formed by spirally wrapping cable around a metal or plastic mandrel, heating to a
"set" temperature, and then "reversing" the coils to give the cord the necessary retractile memory.

"Cord Styles"

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"Cable Styles"

Cable Styles.GIF
   
Retractile Cord Design Equations
C Overall Coil O.D.
M Mandrel Size (Common Sizes .125", .1875", .250", .3125", .375", .4375", .500", .5625", .750", 1.00")
B Body Length
p 3.14159
D Major Dimension of Cable to be Coiled
d Minor Dimension of Cable to be Coiled
TA Tangent A
TB Tangent B


 

 

 

 

 

 

Calculations for Coil Cords:
Number of Coils in Coil Cord
C (Overall Coil Diameter) (Estimate Only)
Length of Cable Used in Coil Cord

Round Cable
B/D
1.2M + 2D
pB(C-D)+ TA + TB
     D

Flat Cable
B/D
1.2M + 2d
pB(C-d)+ TA + TB
     D
COIL CORD GUIDELINES:
 I. Body Length Minimum Tolerances
  a. Less than 3"

+/-1/4"

  b. 3" to 6" +/-1/2"
  c. 6" to 12" +/-1/2"
  d.12" to 18" +/-1" (Will accept +/-1/2")
  e. Over 18" +/-2" (Will accept +/-1")
II. Body O.D.  
a. All coils +/-10%
III. Tangents without Modular Plugs
  a. Nominal tangent dimension "X" measured form end of tangent to closes point of coil body
b. Minimum Tolerance +/- 1/2"
 
IV. Tangents with Modular Plugs
 

a. Nominal tangent dimension "X" represents length of straight cable between plug and closest point
   
of coil body.
b. Minimum Tolerance +/-1" (Will Accept +/-1/2")

 

 


 


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