| CPC F16B 37/065 (2013.01) | 3 Claims |
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1. A clinching-type blind hybrid fastening apparatus inserted into and fastened to a frame part which has a hollow therein, a first coupling hole at an upper plate thereof and a second coupling hole aligned with the first coupling hole in a vertical direction at a lower plate thereof, the apparatus comprising:
a body part which is inserted into the frame part and extends in the vertical direction, through which a through-hole is formed on an inner side thereof in the vertical direction, wherein a fastening screw thread is formed in an inner circumference of the through-hole and an outer lower surface rim of the body part is seated on an upper surface rim around the second coupling hole, the fastening screw thread occupies less than half of the inner circumference of the through-hole and is located on an upper half part of the inner circumference of the through-hole;
a blind fastening part including a rivet fastening portion that integrally extends upward from an upper end rim of the body part and has an upper end disposed above the first coupling hole, a close contact step portion that is integrally formed at an upper portion of the rivet fastening portion and sets to exceed a thickness of the rivet fastening portion, and a head portion that is integrally curved and extends outward along a circumference from an upper end of the close contact step portion to face an upper surface rim around the first coupling hole in the vertical direction; and
a clinching fastening part that is integrally extending downward from a lower end of the body part along a rim of the through-hole and has a lower end disposed below the second coupling hole,
wherein an upper surface of the close contact step portion is integrally connected to and stepped with a lower surface of the head portion, a lower surface of the close contact step portion is integrally connected to and stepped with an upper portion of the rivet fastening portion,
a distance between the upper surface and the lower surface of the close contact step portion is equal to a thickness of the upper plate of the frame part and
an outer diameter of the close contact step portion is set to correspond to an inner diameter of the first coupling hole,
wherein, in the blind fastening part, a recessed portion is recessed downward into the rivet fastening portion, and a central portion of a bottom surface of the recessed portion communicates with the through-hole,
wherein a sum of lengths of the body part, the blind fastening part, and the clinching fastening part is set to exceed an interval between the first coupling hole and the second coupling hole, and a length of the body part in the vertical direction is set to a length less than an interval between the first coupling hole and the second coupling hole, therefore the body part is configured to be inserted into the frame part, and the blind fastening part and the clinching fastening part are configured to be plastically deformed and respectively riveted to the lower surface rim around the first coupling hole and the lower surface rim around the second coupling hole,
wherein an outer diameter of the rivet fastening portion is set to be less than an inner diameter of the first coupling hole,
an outer diameter of the head portion is set to exceed the inner diameter of the first coupling hole, and
an outer diameter of the clinching fastening part is set to correspond to the inner diameter of the second coupling hole.
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