Surface Marking System for Competitive Throwing and Training

Abstract

Improvements in a marking system for use with competitively thrown objects such as discuses, shot puts, hammers and javelins. The marking system has a cavity which contains a marking agent which is automatically deposited from the cavity onto the ground when the thrown object hits the ground. The marking system is for competitive throwing and training to provide a system by the use of which the point of impact of a first object with a second object can be accurately, precisely, efficiently, durably, safely, and accountably marked on the second object by a marking agent born with the first object. The delivery mechanism can be implemented with various impacting objects including but not limited to discus, shot puts, hammers and javelins. This can be implemented in multiple fashions with each impacting object, including but not limited to centrally, radially, and circumferentially.

1 . A marking discus comprising:
 a discus body;   the discus body having at least one cavity within the discus body;   said at least one cavity having a marking agent disposed inside the at least one cavity wherein;   the at least one cavity being in external communication with the periphery of the body of the discus;   said at least one cavity further being in external communication with a top surface and a bottom surface, and   whereby the at least one cavity is configured to transfer the marking agent from within the at least one cavity to the periphery of the body, or to the top surface or to the bottom surface of the discus upon impact of the marking discus with another object.   
     
     
         2 . The marking discus of  claim 1  further includes a cap portion that covers the at least one cavity. 
     
     
         3 . The marking discus of  claim 2  wherein the cap portion that is removable. 
     
     
         4 . The marking discus of  claim 2  wherein the cap portion comprises a threaded portion. 
     
     
         5 . The marking discus of  claim 2  wherein the cap portion comprises a screen. 
     
     
         6 . The marking discus of  claim 5  wherein the screen allows transfer of the marking agent through the screen. 
     
     
         7 . The marking discus of  claim 1  wherein the marking agent is a substance selected from a group consisting of at least one of flour, chalk, paint, calcium carbonate, calcium sulfate, Epsom salts and sand. 
     
     
         8 . A marking shot put or hammer comprising:
 a round body;   the round body having at least one cavity within the round body;   the round body further having at least one cap portion and a marking agent disposed inside the at least one cavity wherein;   the at least one cavity is in external communication with the periphery of the body within a band around the round body;   said at least one cavity further being in external communication with a bottom surface, and   whereby the at least one cavity permits transfer of the marking agent from within the at least one cavity to the band or to the bottom surface upon impact of the marking discuss with another object.   
     
     
         9 . The marking shot put or hammer of  claim 8  further includes a removable cap portion that covers the at least one cavity. 
     
     
         10 . The marking shot put or hammer of  claim 9  wherein the cap portion comprises a threaded portion. 
     
     
         11 . The marking shot put or hammer of  claim 9  wherein the cap portion comprises a screen. 
     
     
         12 . The marking shot put or hammer of  claim 8  wherein the marking agent is a substance selected from a group consisting of at least one of flour, chalk, paint, calcium carbonate, calcium sulfate, Epsom salts and sand. 
     
     
         13 . The marking shot put or hammer of  claim 8  further includes a flexible member connected to the round body. 
     
     
         14 . The marking shot put or hammer of  claim 8  wherein said at least one cavity is in external communication with a top surface. 
     
     
         15 . A javelin comprising:
 a javelin body;   the javelin body having at least one cavity within the javelin body;   the at least one cavity having a replaceable marking agent disposed within;   the at least one cavity is in external communication with the periphery rim of the body;   the at least one cavity is in external communication with a top or a body of the javelin, and   whereby the at least marking agent is transferrable from within the at least one cavity to a space external to the rim of the body of the javelin and to a top or a bottom upon impact of the javelin with another object.   
     
     
         16 . The marking javelin of  claim 15  further having a cap portion that covers the at least one cavity. 
     
     
         17 . The marking javelin of  claim 16  wherein the cap portion is removable. 
     
     
         18 . The marking javelin of  claim 17  wherein the cap portion comprises a threaded portion. 
     
     
         19 . The marking javelin of  claim 16  wherein the cap portion comprises a screen. 
     
     
         20 . The marking javelin of  claim 15  wherein the marking agent is a substance selected from a group consisting of at least one of flour, chalk, paint, calcium carbonate, calcium sulfate, Epsom salts and sand.