Decelerated ejector pin

Abstract

In combination with an ejector half of an injection mold for producing a part, the ejector half having a core plate, a pin plate, an ejector bar, a spring disposed in the ejector bar and at least one fixed ejector pin, a decelerated ejector pin. The decelerated ejector pin includes a first shank portion configured for corresponding to a bore formed in the core plate. A second shank portion is adjacent the first shank portion. The second shank portion is configured to correspond to a bore formed in the pin plate. The second shank portion has a shoulder for engaging the core plate during an ejection stroke of the ejector bar. A third shank portion is adjacent the second shank portion. The third shank portion is configured for retaining the decelerated ejector pin in the pin plate and for compressing the spring when the shoulder engages the core plate.

1 . In combination with an ejector half of an injection mold for producing a part, the ejector half having a core plate, a pin plate, an ejector bar, a spring disposed in the ejector bar and at least one fixed ejector pin, a decelerated ejector pin comprising: 
 a first shank portion configured for corresponding to a bore formed in the core plate;    a second shank portion adjacent said first shank portion, said second shank portion configured for corresponding to a bore formed in the pin plate and having a shoulder for engaging the core plate during an ejection stroke of the ejector bar; and    a third shank portion adjacent said second shank portion, said third shank portion configured for retaining the decelerated ejector pin in the pin plate and for compressing the spring when said shoulder engages the core plate.    
   
   
       2 . The decelerated ejector pin according to  claim 1 , further comprising a fourth shank portion adjacent said third shank portion, said fourth shank portion is configured for passing through an inside diameter of the spring.  
   
   
       3 . The decelerated ejector pin according to  claim 2 , wherein the first shank portion has a first diameter, said second shank portion has a second diameter greater than said first diameter, said third shank portion has a third diameter greater than said second diameter, said fourth shank portion has a fourth diameter smaller than said third diameter.  
   
   
       4 . The decelerated ejector pin according to  claim 3 , wherein said shank portions each have a respective length, said lengths being configured for allowing the decelerated ejector pin to hold the part until the part is clear of the ejector half during the ejection stroke and said lengths being configured for allowing the decelerated ejector pin to be de-molded from the part by compressing the spring as the at least one ejector pin reaches the end of the ejection stroke.  
   
   
       5 . The decelerated ejector pin according to  claim 3 , wherein said fourth shank portion is configured to correspond to a bore formed in the ejector bar and to engage the base plate in a clamped position of the injection mold.  
   
   
       6 . The decelerated ejector pin according to  claim 1 , wherein said second shank portion is a removable sleeve having an inner diameter corresponding to said first diameter.  
   
   
       7 . A decelerated ejector pin for an ejector half of an injection mold for producing a part, the ejector half having a core plate, a pin plate, an ejector bar, a spring disposed in the ejector bar and at least one fixed ejector pin, a decelerated ejector pin comprising: 
 a first shank portion configured for corresponding to a bore formed in the core plate;    a second shank portion adjacent said first shank portion, said second shank portion configured for corresponding to a bore formed in the pin plate and having a shoulder for engaging the core plate during an ejection stroke of the ejector bar; and    a third shank portion adjacent said second shank portion, said third shank portion configured for retaining the decelerated ejector pin in the pin plate and for compressing the spring when said shoulder engages the core plate.    
   
   
       8 . The decelerated ejector pin according to  claim 7 , further comprising a fourth shank portion adjacent said third shank portion, said fourth shank portion is configured for passing through an inside diameter of the spring.  
   
   
       9 . The decelerated ejector pin according to  claim 8 , wherein the first shank portion has a first diameter, said second shank portion has a second diameter greater than said first diameter, said third shank portion has a third diameter greater than said second diameter, said fourth shank portion has a fourth diameter smaller than said third diameter.  
   
   
       10 . The decelerated ejector pin according to  claim 9 , wherein said shank portions each have a respective length, said lengths being configured for allowing the decelerated ejector pin to hold the part until the part is clear of the ejector half during the ejection stroke and said lengths being configured for allowing the decelerated ejector pin to be de-molded from the part by compressing the spring as the at least one ejector pin reaches the end of the ejection stroke.  
   
   
       11 . The decelerated ejector pin according to  claim 10 , wherein said fourth shank portion is configured to correspond to a bore formed in the ejector bar and to engage the base plate in a clamped position of the injection mold.  
   
   
       12 . The decelerated ejector pin according to  claim 8 , wherein said second shank portion is a removable sleeve having an inner diameter corresponding to said first diameter.  
   
   
       13 . In an ejector half of an injection mold, for molding a molded part, a core plate, a pin plate, an ejector bar, a base plate, and at least one fixed ejector pin, a decelerated ejector pin system, comprising: 
 at least one further ejector pin to be moved and decelerated through the core plate;    a shoulder formed on said further ejector pin engaging the core plate for decelerating said further ejector pin during an ejection stroke of the ejector bar;    a spring disposed in the ejector bar; and    a further shoulder formed on said further ejector pin for supporting said further ejector pin and compressing said spring.    
   
   
       14 . The decelerated ejector pin system according to  claim 13 , wherein: 
 said further ejector pin has a shank portion having a diameter adjacent said further shoulder, said shank portion configured to correspond to an inner diameter of said spring.    
   
   
       15 . The decelerated ejector pin system according to  claim 13 , wherein said further ejector pin is longer than the at least one fixed ejector pin.  
   
   
       16 . The decelerated ejector pin system according to  claim 14 , wherein said shank portion is configured to engage the base plate in a clamped state of the injection mold.