| 摘要 |
913,926. Linkwork. YARNALL-WARING CO. July 7, 1960 [Sept. 24, 1959], No. 23826/60. Class 80 (3). [Also in Groups XVIII and XXXVII] In mechanism for converting the linear motion of a float 50, Fig. 9, or other device in a sealed chamber 35<SP>3</SP> into angular motion of a switch element 84 or other device outside the chamber, e.g. in a liquid level gauge, the element 84 is mounted on the outer end of a spring wire 31 extending into a resilient tube 30 which is sealed in the chamber wall, the tube 30 being curved in part of a helix and having the float 50 attached to its closed free end 32 so that linear movement of the float deflects the tube 30 in a direction parallel to the axis of the helix. The wire 31 may be formed to the same curvature as the tube, in which case progressive deflection of the tube causes a progressive relative angular movement between the outer ends of the tube and wire, or may be oppositely curved to give a snap action. Alternatively the wire and tube may be formed as in Fig. 18 so that their natural curvatures are partly similar and partly opposite to give a snap action following a progressive movement. As shown, the element 84 carries switch contacts co-operating, with snap-action, with fixed contact strips, and is clamped on an insulating block on the wire 31. A pigtail 87 connects the element to a fixed terminal. A fixed curved tube 73 provides upper and lower stops for the tube 30. In a modification dispensing with the tube 73, upper and lower stop-rods extend from the chamber wall, and the tube 30 has at its end a reverse curve on which the float 50 is suspended. In a further modification the element 84 is replaced by an arm operating the buttons of separate switches and is mounted on a wire extending fully into a resilient tube formed in a complete helix turn, the inner ends of the wire and tube being secured together. The resilient tube may contain more than one spring wire actuating separate devices. |
