Light keying arrangement for mounting on a mounting rail

Abstract

A set of interchangeable keying members for keying a body that is mountable on mounting rails having keying features of different sizes and shapes, wherein the members of the set may each comprise: a key body for being disposed in a recess of the body and having a keying feature that corresponds to the keying feature of the mounting rail for engaging the keying feature of the mounting rail when the body is mounted thereto. The size, or shape, or position, or a combination thereof of the keying feature of each of the keying members of the set of keying members may be different and correspond to a keying feature of a mounting rail.

What is claimed is: 
     
         1 . A set of interchangeable keying members for keying a light body that is mountable on mounting rails having keying features of different sizes and shapes, each of said keying members of said set comprising:
 a key body of a size and a shape for being disposed in a recess of the light body, said key body having a feature that is for being engaged by a shaft proximate a mounting arrangement of the light body when said key body is disposed in the recess of the light body;   a keying feature of said key body, the keying feature having a size and a shape that corresponds to the size and shape of the keying feature of the mounting rail;   the keying feature being positioned on said key body in a location for engaging the keying feature of the mounting rail when the light body is mounted to the mounting rail;   wherein the size, or shape, or position, or a combination of size, shape and position, of the keying feature on said key body of each of said keying members of said set of keying members is different and corresponds to a keying feature of a mounting rail.   
     
     
         2 . The set of interchangeable keying members of  claim 1  wherein the keying feature of said key body of each of said keying members of said set comprises a projection that engages a corresponding recess keying feature of the mounting rail. 
     
     
         3 . The set of interchangeable keying members of  claim 1  wherein the feature that is for being engaged by a shaft proximate a mounting arrangement of the light body includes said key body having a hole therethrough for receiving the shaft. 
     
     
         4 . The set of interchangeable keying members of  claim 3  wherein the shaft passes through the hole through the key body and wherein:
 the shaft is threaded and engages at least one hole of the light body; or 
 the shaft is a clamp screw associated with the mounting arrangement of the light body. 
 
     
     
         5 . The set of interchangeable keying members of  claim 1  wherein said key body further includes an extension having a shape complementary to a shape of the light body so that the extension is adjacent the light body when said keying member is disposed in the recess of the light body. 
     
     
         6 . The set of interchangeable keying members of  claim 5  wherein said extension includes an arcuate extension at one end of said key body. 
     
     
         7 . The set of interchangeable keying members of  claim 1  in combination with:
 a light body containing a light source, a cavity for receiving a source of electrical energy, and a switch for selectively coupling the light source in circuit with the source of electrical energy for producing light when a source of electrical energy is in the cavity; and 
 a clamping arrangement including first and second clamp members on said light body movable closer together for clamping a mounting rail therebetween and movable farther apart for releasing the mounting rail, whereby a mounting rail may be clamped between said first and second clamp members; 
 wherein one of said set of interchangeable keying members is removably disposed in a recess located on said light body between said first and second clamp members in a predetermined location with respect to a fixed one of said first and second clamping members. 
 
     
     
         8 . The set of interchangeable keying members of  claim 7  wherein:
 the one of said set of interchangeable keying members is retained in the recess by said clamping arrangement; or 
 the one of said set of interchangeable keying members in the recess is determined by said clamping arrangement; or 
 the one of said set of interchangeable keying members is retained in the recess by said clamping arrangement and the location of the one of said set of interchangeable keying members in the recess is determined by said clamping arrangement. 
 
     
     
         9 . The set of interchangeable keying members of  claim 7  wherein said clamping arrangement includes a clamp screw, wherein the one of said set of interchangeable keying members is located and retained in the recess by the clamp screw. 
     
     
         10 . The set of interchangeable keying members of  claim 7  wherein the recess of said light body is a channel, and wherein the one of said set of interchangeable keying members has a key body that fits into the channel of said light body in a predetermined location determined by said clamping arrangement 
     
     
         11 . The set of interchangeable keying members of  claim 7  wherein said first clamp member comprises an elongated longitudinal clamp member fixed on said light body and wherein said second clamp member comprises a movable elongated clamp member disposed longitudinally and movably adjacent said light body opposing said fixed clamp member and spaced apart therefrom. 
     
     
         12 . The set of interchangeable keying members of  claim 11  wherein one or both of said fixed elongated longitudinal clamp member and said movable elongated longitudinal clamp member has an elongated longitudinal chamfered edge for facilitating the mounting of the light body on the mounting rail in a snap-on, snap-off manner. 
     
     
         13 . A set of interchangeable keying members for keying a mountable body that is mountable on mounting rails having keying features of different sizes and shapes, each of said keying members of said set comprising:
 a key body of a size and a shape for being disposed in a recess of the mountable body, said key body having a feature that is for being engaged by a shaft proximate a mounting arrangement of the mountable body when said key body is disposed in the recess of the mountable body;   a keying feature of said key body, the keying feature having a size and a shape that corresponds to the size and shape of the keying feature of the mounting rail;   the keying feature being positioned on said key body in a location for engaging the keying feature of the mounting rail when the mountable body is mounted to the mounting rail;   wherein the size, or shape, or position, or a combination of size, shape and position, of the keying feature on said key body of each of said keying members of said set of keying members is different and corresponds to a keying feature of a mounting rail.   
     
     
         14 . The set of interchangeable keying members of  claim 13  wherein the keying feature of said key body of each of said keying members of said set comprises a projection that engages a corresponding recess keying feature of the mounting rail. 
     
     
         15 . The set of interchangeable keying members of  claim 13  wherein the feature that is for being engaged by a shaft proximate a mounting arrangement of the mountable body includes said key body having a hole therethrough for receiving the shaft. 
     
     
         16 . The set of interchangeable keying members of  claim 13  wherein the shaft passes through the hole through the key body and wherein:
 the shaft is threaded and engages at least one hole of the mountable body; or 
 the shaft is a clamp screw associated with the mounting arrangement of the mountable body. 
 
     
     
         17 . The set of interchangeable keying members of  claim 13  wherein said key body further includes an extension having a shape complementary to a shape of the mountable body so that the extension is adjacent the mountable body when said keying member is disposed in the recess of the mountable body. 
     
     
         18 . The set of interchangeable keying members of  claim 17  wherein said extension includes an arcuate extension at one end of said key body. 
     
     
         19 . The set of interchangeable keying members of  claim 13  in combination with:
 a mountable body containing operative elements thereof; and 
 a clamping arrangement including first and second clamp members on said mountable body movable closer together for clamping a mounting rail therebetween and movable farther apart for releasing the mounting rail, whereby a mounting rail may be clamped between said first and second clamp members; 
 wherein one of said set of interchangeable keying members is removably disposed in a recess located on said mountable body between said first and second clamp members in a predetermined location with respect to a fixed one of said first and second clamping members. 
 
     
     
         20 . The set of interchangeable keying members of  claim 19  wherein:
 the one of said set of interchangeable keying members is retained in the recess by said clamping arrangement; or 
 the location of the one of said set of interchangeable keying members in the recess is determined by said clamping arrangement; or 
 the one of said set of interchangeable keying members is retained in the recess by said clamping arrangement and the location of the one of said set of interchangeable keying members in the recess is determined by said clamping arrangement. 
 
     
     
         21 . The set of interchangeable keying members of  claim 19  wherein said clamping arrangement includes a clamp screw, wherein the one of said set of interchangeable keying members is located and retained in the recess by the clamp screw. 
     
     
         22 . The set of interchangeable keying members of  claim 19  wherein the recess of said mountable body is a channel, and wherein the one of said set of interchangeable keying members has a key body that fits into the channel of said mountable body in a predetermined location determined by said clamping arrangement 
     
     
         23 . The set of interchangeable keying members of  claim 19  wherein said first clamp member comprises an elongated longitudinal clamp member fixed on said mountable body and wherein said second clamp member comprises a movable elongated clamp member disposed longitudinally and movably adjacent said mountable body opposing said fixed clamp member and spaced apart therefrom. 
     
     
         24 . The set of interchangeable keying members of  claim 23  wherein one or both of said fixed elongated longitudinal clamp member and said movable elongated longitudinal clamp member has an elongated longitudinal chamfered edge for facilitating the mounting of the mountable body on the mounting rail in a snap-on, snap-off manner.