| 摘要 |
1,150,936. Making springs. J. KIRCHGASSER. 18 Aug., 1966 [1 Sept., 1965], No. 37112/66. Headings B3A and B3N. A circular spring is manufactured from a straight helical tension spring 4 by first bending it to a U-shape, Fig. 1, inserting the ends into clamping devices 19, 20, Fig. 5, swinging the clamping devices about centres 12, 13 so that the ends are aligned, rotating the clamping devices about the axis of the spring, pushing one end into the other, and releasing the ends so that they are screwed together. The device for bending the spring comprises a horizontal slide 1, Fig. 1, on which are mounted pins 2, 5, and a clamp 6 for holding the spring, and slides 3 movable relative to slide 1 to form the legs 4a, 4b on the spring. Each of the clamping devices comprises a roller 7, having a pinion 16 driven by a toothed quadrant 18, Fig. 10, actuated by a tappet 23, and two idle rollers 8 carried by a pivoted lever 9. Rollers 7 are provided with a peripheral layer of diamond dust. In a modification, one end 4a of the spring, Fig. 12, is held in a stationary clamping device 26, and the other end 4b is held in the jaws 29 of a clamping device 27, which is pivotable about an axis 30. The end 4a is rotated, and the end 4b is moved in the direction P. |
