Rear Deploying Broadhead

Abstract

The present invention is a rear-deploying broadhead with an outer housing, an inner spine, and at least two blades pivotally attached to the inner spine, with the inner spine having a plunger end and a pointed end. The outer housing has a closed end that terminates proximal the body to an arrow shaft and an open second end. The inner spine is shorter than the outer housing and disposed in the center of the outer housing, with the plunger seated inside the outer housing adjacent the end of the outer housing. The two blades are configured to deploy through the open sides of the outer housing upon movement of the inner spine toward the end of the outer housing. The broadhead has a coating of non-latex material that is retained until the broadhead impacts a target, at which point the blades deploy through the coating.

I claim: 
     
         1 . A rear-deploying broadhead comprising a body attachable to an arrow shaft, said body comprising an outer housing, an inner spine, and at least two blades pivotally attached to said inner spine,
 wherein said inner spine has a first end with a plunger end, and a second end with a pointed end,   wherein the outer housing comprises a first closed end that terminates proximal to a structure for attaching the body to an arrow shaft and a second end which is open,   wherein said outer housing comprises two lateral sides with are substantially open adjacent the second end of the outer housing,   wherein said outer housing further comprises a front side and a rear side which both terminate at the second end of the outer housing with a pointed end,   wherein said inner spine is shorter than the outer housing and is substantially disposed in the center of said outer housing, with said plunger end seated snuggly but movably inside the outer housing adjacent the first end of said outer housing,   wherein, in a nondeployed state, the second end of the inner spine extends slightly beyond the furthest extent of the second end of the outer housing, and   wherein said broadhead further comprises an external coating of a non-latex material having an impact value allowing said coating to retain until the broadhead impacts a target, at which point the blades deploy through the external coating.   
     
     
         2 . The broadhead of  claim 1 , wherein said at least two blades pivotally attached to the inner spine are in a retracted position in a nondeployed state. 
     
     
         3 . The broadhead of  claim 2 , wherein the at least two blades are held in a retracted position in a nondeployed state by friction, and are configured to deploy through the substantially open lateral sides of the outer housing upon movement of the inner spine toward the first end of the outer housing. 
     
     
         4 . The broadhead of  claim 1 , wherein said two blades are each pivotally attached to said inner spine at two points on the inner spine. 
     
     
         5 . The broadhead of  claim 4 , wherein said two blades are each pivotally attached to said inner spine at least at a point approximately midway between the two ends of said inner spine. 
     
     
         6 . The broadhead of  claim 5 , wherein said two blades are each pivotally attached to said inner spine at least at a point proximal to the level of the termination of the second end of the outer housing. 
     
     
         7 . The broadhead of  claim 5 , wherein said two blades are pivotally attached at two points on the inner spine, with a first attachment approximately midway between the two ends of said inner spine and a second attachment proximal to the level of the termination of the second end of the outer housing. 
     
     
         8 . A rear-deploying broadhead comprising an outer housing, an inner spine, and at least two blades pivotally attached to said inner spine,
 wherein said inner spine has a first end with a plunger end, and a second end distal to said plunger end,   wherein said outer housing comprises a first closed end that terminates with a structure that is attachable to an arrow shaft and a second end which is open,   wherein said outer housing comprises two lateral sides with are substantially open adjacent the second end of the outer housing,   wherein said outer housing further comprises a front side and a rear side which both terminate at the second end of the outer housing,   wherein said inner spine is shorter than the outer housing and is substantially disposed in the center of said outer housing, with said plunger end seated snuggly but movably inside the outer housing adjacent the first end of said outer housing,   wherein, in a nondeployed state, the second end of the inner spine extends slightly beyond the furthest extent of the second end of the outer housing,   wherein the at least two blades are pivotally attached to the inner spine and are retained in a retracted position in a nondeployed state,   wherein, upon said broadhead striking a target with the extended point of the inner spine striking first, said inner spine is pushed into the outer housing toward the first end of said housing in a plunger-like manner, with said blades deploying through the openings in the lateral sides of the outer housing when the second end of the inner spine is depressed past the second ends of the front side and rear side of the outer housing, and,   wherein said broadhead further comprises an external coating of non-latex material having an impact value allowing said coating to retain until the broadhead impacts a target, at which point the blades deploy through the external coating.   
     
     
         9 . A rear-deploying broadhead comprising a body attachable to an arrow shaft, said body comprising an inner spine and an outer housing having a first end proximal the attachment to the arrow shaft and a second end,
 wherein said inner spine is disposed within said outer housing when the broadhead is in a nondeployed position,   wherein the inner spine comprises a first plunger end and a second pointed end, wherein said pointed end is disposed in a position forward to second end of the outer housing, and situated substantially in the center of the outer housing and movable within the outer housing in a plunger-like manner,   wherein the first plunger end of the inner spine is seated snuggly toward the first end of the outer housing,   wherein at least two blades are pivotally attached to the inner spine, and   wherein said broadhead further comprises an external coating of latex or similar material having an impact value allowing said coating to retain until the broadhead impacts a target, at which point the blades deploy through the external coating.   
     
     
         10 . The broadhead of  claim 9 , further comprising a structure proximal to the first end of the outer housing that is threadably attachable to an arrow shaft. 
     
     
         11 . The broadhead of  claim 9 , wherein said blades are folded inward by means of additional pivots when the broadhead is in a nondeployed position, and the blades are pivotally attached to the inner spine proximal to the level of the termination of the second end of the outer housing. 
     
     
         12 . The broadhead of  claim 9 , wherein said outer housing comprises slots there-through adapted for deployment of blades. 
     
     
         13 . The broadhead of  claim 9 , wherein the outer housing comprises recesses for the frictional retraction of the non-deployed blades.