Patent ID: 6042298
Filing Date: 2000-03-28
Classification: E06B,Y10T

Abstract:
The combination of a pair of hollow frame sections and a mechanical coupling for an angle joint between ends of said pair of hollow frame sections adjoining at an angle and each having an opening in the respective frame section spaced from the respective end, said mechanical coupling comprising:an angular body having arms extending into the respective frame sections at said ends;a screw threaded diagonally into said body at a junction between said arms;respective grooves formed in said body leading from said junction into the respective arm and terminating at an end of the groove distal from the screw;a respective recess in said body at the end of the respective groove distal from said screw;a spring-loaded tooth received in each recess and adapted to project from the respective arm into the respective opening but spring biased out of said opening into the arm; anda row of balls in each of said grooves bearing on the respective tooth and, upon rotation of said screw, camming the tooth out into said opening and drawing said frame sections tightly against one another.