Abstract:
A terminal block adapted for mounting on various domestic and standardized European DIN mounting rails. The terminal block incorporates a number of integral, fixed and flexible retaining members. Each retaining member has one or more slots which, in the proper combination, engage various mounting rails for attachment of the terminal block.

Description:
FIELD OF THE INVENTION 
     This invention relates to electrical terminal blocks for mounting on various tracks or DIN rails, and more particularly, to a universally mounting electrical terminal block for electrical control panels. 
     BACKGROUND OF THE INVENTION 
     In the United States it has been customary for manufacturers of terminal blocks to design their terminal blocks for mounting only on their mounting rails. In Europe, terminal block manufacturers have designed their terminal blocks to mount on one or more standardized DIN rails. The lack of a standardized mounting system has in many cases required the end user to purchase additional mounting rails to accommodate the terminal blocks of various manufacturers. 
     SUMMARY OF THE INVENTION 
     It is the object of this invention to permit a terminal block to be mounted on a number of different mounting rails including domestic mounting rails and the standardized European DIN 1, DIN 3, and miniature DIN (15 mm×5 mm) mounting rails. The objective is achieved by providing on the terminal block base, a number of retaining members, some being flexible and others being fixed, such that various combinations of the flexible and fixed members permit the terminal block to mount on the various mounting rails. 
     Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cross sectional side view of the terminal block. 
     FIG. 2 is a cross sectional side view of the terminal block installed on an Allen Bradley mounting rail. 
     FIG. 3 is a cross sectional side view of the terminal block installed on a DIN 3 mounting rail. 
     FIG. 4 is a cross sectional side view of the terminal block installed on a DIN 1 mounting rail. 
     FIG. 5 is a cross sectional side view of the terminal block installed on a DIN Mini (15 mm×5 mm) mounting rail. 
     FIG. 6 is a cross sectional side view of the terminal block installed on a Square D mounting rail. 
    
    
     Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various other ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. 
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The terminal block 10 of FIG. 1 is adapted for mounting on various domestic and standardized DIN mounting rails. The terminal block 10 includes two terminal connectors 14 and a bus bar 18 electrically connecting the two terminal connectors 14. The terminal block 10 also includes a bus bar retaining tab 22 for securely holding the bus bar 18 in the terminal block 10. One end of the terminal block 10 forms a base 26 having an inside surface 30 facing the bus bar 18, and an outside surface 34 facing away from the bus bar 18. The base 26 also includes a first end 38 and a second end 42. 
     A flexing arm 46 is moveably attached to the second end 42 of the base 26. The flexing arm 46 extends generally parallel to the longitudinal axis of the base 26 and has an extended end 50. 
     A release arm 54 extends at an obtuse angle relative to the longitudinal axis of the flexing arm 46. The release arm 54 acts as a lever to provide pivotal movement of the flexing arm 46 about its connection at the second end 42 of the base 26. The release arm 54 also includes a screwdriver slot 58 for inserting a screwdriver to effectively increasing the length of the lever formed by the release arm 54. 
     A plurality of retaining members 62 are integrally formed from the base 26 and spaced apart one from another along the longitudinal axis of the base 26. The retaining members 62 extend perpendicular to the outside surface 34 of the base 26. Each retaining members 62 has an inside surface 66 facing the vertical center line 70 of the terminal block 10 and an outside surface 74 facing away from the center line 70 of the terminal block 10. 
     The first retaining member 78 extends from the first end 38 of the base 26 and has a rail slot 82 on its inside surface 66. The first retaining member 78 is rigidly connected to the base 26. 
     The second retaining member 86 is spaced apart a predetermined distance from and immediately adjacent the first retaining member 78 and has a rail slot 90 on its outside surface 74 and a rail slot 94 on its inside surface 66. The second retaining member 86 is flexibly connected to the base 26. 
     The third retaining member 98 is spaced a predetermined distance from and immediately adjacent to the second retaining member 86 and has a rail slot 102 on its inside surface 66. The third retaining member 98 is rigidly connected to the base 26. 
     The fourth retaining member 106 is spaced a predetermined distance from and immediately adjacent the third retaining member 98 and has a rail slot 110 on its inside surface 66 and a rail slot 114 on its outside surface 74. The fourth retaining member 106 has a rounded end 118 and a first beveled surface 122 leading to its inside surface 66 and a second beveled surface 126 leading to its outside surface 74. The fourth retaining member 106 is flexibly connected to the base 26. 
     A fifth retaining member 130 is spaced a predetermined distance from and immediately adjacent the fourth retaining member 106 and extends perpendicular to the extended end 50 of the flexing arm 46. The fifth retaining member 130 has a rail slot 134 on its inside surface 66 and a rounded end 138 with a beveled surface 142 leading to its inside surface 66. The fifth retaining member 130 is moved as the flexing arm 46 is pivoted about the second end 42 of the base 26. 
     In FIG. 2, the terminal block 10 is mounted on an Allen Bradley mounting rail 144. This is accomplished by inserting a first flange 148 of the Allen Bradley mounting rail 144 into the inward facing slot 82 of the first retaining member 78. The terminal block 10 is then rotated about the first flange 148 until a second flange 152 contacts the first beveled surface 122 of the flexible fourth retaining member 106. The fourth retaining member 106 flexes away from the second flange 152 permitting the second flange 152 to slid up the first beveled surface 122 of the fourth retaining member 106 and into the inward facing slot 110. The terminal block 10 is removed from the Allen Bradley mounting rail 144 by pushing on the terminal block 10 in such a manner that the fourth retaining member 106 flexes allowing the second flange 152 to disengage from the inward facing slot 110 of the fourth retaining member 106. This flexing and removal of the block 10 may be accomplished by pushing release arm 54 with or without a screwdriver in slot 58 as a lever or simply by pushing a thumb against release arm 54 to flex it. 
     In FIG. 3, the terminal block 10 is mounted on a DIN 3 mounting rail 156. This is accomplished by inserting a first flange 160 of the DIN 3 rail 156 into the inward facing slot 82 of the first retaining member 78. The terminal block 10 is rotated about the first flange 160 until a second rail 164 contacts the beveled surface 142 of the fifth retaining member 130. The flexing arm 46 pivots causing the fifth retaining member 130 to move away from the second flange 164. The second flange 164 slides up the beveled surface 142 of the fifth retaining member 130 and into the inward facing slot 134. The terminal block 10 is released from the DIN 3 mounting rail 156 by pushing the release arm 54 inwardly toward the body of the terminal block 10 which causes the flexing arm 46 to pivot and the fifth retaining member 130 to move away from the second flange 164. This movement releases the second flange 164 from the inward facing slot 134 of the fifth retaining member 130. 
     In FIG. 4, the terminal block 10 is mounted on a DIN 1 mounting rail 168. This is accomplished by inserting a first flange 172 of the DIN 1 mounting rail 168 into the outward facing slot 90 of the second retaining member 86. The terminal block 10 is rotated about the first flange 172 until a second flange 176 engages the second beveled surface 126 of the fourth retaining member 106. The fourth retaining member 106 flexes away from the second flange 176 permitting the second flange 176 to slide up the second beveled surface 126 of the fourth retaining member 106 and into the outward facing slot 114. The terminal block 10 is released from the DIN 1 mounting rail 168 by pushing the terminal block 10 such that the second retaining member 86 flexes permitting the second flange 176 to disengage from the outward facing slot 114 of the fourth retaining member 106. 
     In FIG. 5, the terminal block 10 is mounted on a DIN Mini mounting rail 180. This is accomplished by inserting a first flange 184 of the DIN Mini mounting rail 180 into the inward facing slot 94 of the second retaining member 86. The terminal block 10 is rotated about the first flange 184 such that a second flange 188 contacts the first beveled surface 122 of the fourth retaining member 106. The fourth retaining member 106 flexes such that the second flange 188 slides up the first beveled surface 122 of the fourth retaining member 106 and into the inward facing slot 110 of the fourth retaining member 106. The terminal block 10 is released from the DIN Mini mounting rail 180 by pushing the terminal block 10 such that the fourth retaining member 106 flexes permitting the second flange 188 to disengage from the inward facing slot 110 of the fourth retaining member 106. 
     In FIG. 6, the terminal block 10 is mounted on a Square D mounting rail 192. This is accomplished by inserting a flange 196 of the Square D mounting rail 192 into the inward facing slot 102 of the third retaining member 98. The terminal block 10 is rotated about the first flange 196 such that a second flange 200 contact the beveled surface 142 of the fifth retaining member 130. The flexing arm 46 pivots causing the fifth retaining member 130 to move away from the second flange 200. The second flange 200 slides up the beveled surface 142 of the fifth retaining member 130 and into the inward facing slot 134. The terminal block 10 is released from the Square D mounting rail 192 by pushing the release arm 54 toward the terminal block 10. The movement of the release arm 54 inwardly toward the body of the terminal block 10 causes the flexing arm 46 to pivot and the fifth retaining member 130 to move away from the second flange 200. This movement permits the inward facing slot 134 of the fifth retaining member 130 to release the second flange 200 of the Square D mounting rail 192.