Time coupling

Abstract

A coupling device for use with a primer and blasting cap in demolition fig devices and the like. The device includes a body portion defining a straight line path from the primer to the blasting cap. Also included is a moveable slide positioned in the body to block the straight line path and moveable to clear that path. A spring is used to act on the slide to clear the path, and a safety pin holds the slide against the spring until firing is desired. A time delay device such as a liquid annular orifice dashpot delays movement of the slide. A preferred embodiment uses two slides and two springs to first clear the path and second place a blasting cap lead in alignment on the path when the slides clear the path.

I claim: 
     
       1. A coupling device for use with a primer and blasting cap, comprising: a body portion defining a straight line path from said primer to said blasting cap;   a moveable slide means positioned in said body to block said path, said slide means being moveable to clear said path;   biasing means urging said slide means to clear said path;   safety locking means holding said slide against said biasing means, said locking means being removeable upon demand; and   time delay means for delaying movement of said slide means by said biasing means to clear said path after removal of said safety locking means.   
     
     
       2. The device of claim 1, wherein said safety locking means is a safety pin. 
     
     
       3. The device of claim 2, wherein said time delay means is a liquid annular orifice dashpot with a time delay of at least 2 minutes. 
     
     
       4. The device of claim 3, wherein said time delay is between 2 and 6 minutes. 
     
     
       5. The device of claim 1, wherein said slide means includes a first slide positioned in said path, said first slide having a blasting cap lead aligned to be in said path when said slide means clears said path, said first slide having second biasing means urging said first slide to clear said path; said slide means also including a second slide positioned in a first position by said safety lock means spaced from said time delay means, said biasing means urging said second slide toward said time delay means;   said slide means also including detent means preventing movement of said first slide until movement of said second slide is permitted by said time delay means.   
     
     
       6. The of claim 5, wherein said time delay means is a liquid annular orifice dashpot with a time delay of at least 2 minutes. 
     
     
       7. A coupling device for use with a primer and blasting cap comprising: a body portion defining a straight line path from said primer to said blasting cap;   a moveable slide means positioned in said body to block said path, said slide means being moveable to clear said path;   biasing means urging said slide means to clear said path;   safety locking means holding said slide against said biasing means, said locking means being removeable upon demand; and   time delay means for delaying movement of said slide means by said biasing means to clear said path after removal of said safety locking means;   said slide means including a first slide positioned in said path, said first slide having a blasting cap lead aligned to be in said path when said slide means clears said path, said first slide having second biasing means urging said first slide to clear said path;   said slide means also including a second slide positioned in a first position by said safety lock means spaced from said time delay means, said biasing means urging said second slide toward said time delay means;   said slide means also including detent means preventing movement of said first slide until movement of said second slide is permitted by said time delay means.   
     
     
       8. The device of claim 7, wherein said safety locking means is a safety pin. 
     
     
       9. The device of claim 7, wherein said time delay means is a liquid annular orifice dashpot with a time delay of at least 2 minutes. 
     
     
       10. The device of claim 3, wherein said time delay is between 2 and 6 minutes.