Coupling apparatus for a T-shaped tube unit

A coupling apparatus for a T-shaped tube unit, said T-shaped tube unit including a first circular tube having a hole formed therethrough, and a second circular tube connected securely to said first circular tube in such a manner that said first circular tube is perpendicular to said second circular tube, said coupling apparatus comprising:

• a first resilient securing member having a convex side surface, a concave side surface, a central hole, an internally threaded circular tubular projection protruding axially from a central portion of one of said convex side surface and said concave side surface of said first resilient securing member, and a plurality of radial projections positioned on a periphery of said first resilient securing member, said radial projections of said first resilient securing member having distal ends which are spaced apart from center of said central hole of said first resilient securing member at a distance slightly greater than half inner diameter of said first circular tube, said first resilient securing member being press fitted in an end portion of said first circular tube in such a manner that said concave side surface of said first resilient securing member faces toward said second circular tube, said central hole of said first resilient securing member being aligned with said hold of said second circular tube;
• a second resilient securing member having a convex side surface, a concave side surface, a central hole, a circular tubular projection protruding axially from a central portion of said convex side surface of said second resilient securing member, and a plurality of radial projections protruding from a periphery of said second resilient securing member, said radial projections of said second resilient securing member having distal ends which are spaced apart from center of said central hole of said second resilient securing member at a distance slightly greater than half inner diameter of said first circular tube, said second resilient securing member being press fitted in the end portion of said first circular tube in such a manner that said concave side surface of said second resilient securing member faces toward said second circular tube, said circular tubular projection of said first resilient securing member being positioned within said circular tubular projection of said second resilient securing member, said central hole of said second resilient securing member being aligned with said hole of said second circular tube;
• and
• a bolt extending through said hole of said second circular tube and said circular tubular projection of said second resilient securing member to engage threadably with said circular tubular projection of said first resilient securing member;
• wherein said second resilient securing member has a plurality of axial guide projections protruding axially from a periphery of said convex side surface thereof, said axial guide having distal ends which are spaced apart from center of said second resilient securing member at a distance slightly smaller than half inner diameter of said first circular tube.

A coupling apparatus for a T-shaped tube unit, said T-shaped tube unit including a first circular tube having a hole formed therethrough, and a second circular tube connected securely to said first circular tube in such a manner that said first circular tube is perpendicular to said second circular tube, said coupling apparatus comprising:

• a first resilient securing member having a convex side surface, a concave side surface, a central hole, an internally threaded circular tubular projection protruding axially from a central portion of one of said convex side surface and said concave side surface of said first resilient securing member, and a plurality of radial projections positioned on a periphery of said first resilient securing member, said radial projections of said first resilient securing member having distal ends which are spaced apart from center of said central hole of said first resilient securing member at a distance slightly greater than half inner diameter of said first circular tube, said first resilient securing member being press fitted in an end portion of said first circular tube in such a manner that said concave side surface of said first resilient securing member faces toward said second circular tube, said central hole of said first resilient securing member being aligned with said hold of said second circular tube;
• a second resilient securing member having a convex side surface, a concave side surface, a central hole, a circular tubular projection protruding axially from a central portion of said convex side surface of said second resilient securing member, and a plurality of radial projections protruding from a periphery of said second resilient securing member, said radial projections of said second resilient securing member having distal ends which are spaced apart from center of said central hole of said second resilient securing member at a distance slightly greater than half inner diameter of said first circular tube, said second resilient securing member being press fitted in the end portion of said first circular tube in such a manner that said concave side surface of said second resilient securing member faces toward said second circular tube, said circular tubular projection of said first resilient securing member being positioned within said circular tubular projection of said second resilient securing member, said central hole of said second resilient securing member being aligned with said hole of said second circular tube;
• and
• a bolt extending through said hole of said second circular tube and said circular tubular projection of said second resilient securing member to engage threadably with said circular tubular projection of said first resilient securing member;
• wherein a third resilient securing member is similar to said second resilient securing member in construction and is press fitted in said first circular tube between said second resilient securing member and said second circular tube, said third resilient securing member having a convex side surface from which a circular tubular projection protrudes to abut against said second resilient securing member, said bolt extending through said circular tubular projection of said third resilient securing member.