| 摘要 |
PCT No. PCT/BE82/00012 Sec. 371 Date Jan. 12, 1983 Sec. 102(e) Date Jan. 12, 1983 PCT Filed May 27, 1982 PCT Pub. No. WO82/04196 PCT Pub. Date Dec. 9, 1982.Detachable links are formed by a first link having a part-spherical end joined to a cylindrical first intermediate portion and a second link having a receiving end with spaced, generally U-shaped arms defining a slot. The arms resiliently spread apart to receive and then snap back to capture the part-spherical portion, leaving the cylindrical portion in the slot. The joined links may be freely relatively pivoted through substantially 180 degrees and may be freely relatively rotated through a full 360 degrees about the axis of the cylindrical portion. The part-spherical portion may have one upstanding cylindrical stub or a diametrically opposed pair which are positionable either between the legs of the arms or in the slot between arms. These stubs limit the free rotation between links by resisting same except as permitted by forcible rotation in 90 degree steps due to spreading apart and snapping back of the arms. In one position where the stubs are located between the legs of the arms, free pivoting through 180 degrees as the cylindrical portion traverses the slot is permitted but forcible stepwise axial rotation is still required. When the stubs are in the slot pivoting is limited except as permitted by forcible pivoting in 90 degree steps. If only one stub is present, free pivoting through 90 degrees is permitted for about 90 degrees of the slot while forced pivoting through the remaining 90 degree traverse is required. |
