Constant Hanger

Abstract

This constant hanger prevents excessive load on the frame, prevents accidental rotation of the rotating arm due to loose nuts, and securely fixes the rotating arm temporarily while maintaining the set support force. [Solution] A lock bolt 11 is passed through the rotating arm plate 7 of the constant hanger 1, which supports the suspended member by spring force, and the frame plate 6 that rotatably supports it. A load-receiving nut 12 that screws onto the lock bolt 11 is passed through the rotating arm plate 7, and a flange portion 12b that can be attached to the inner surface of the frame plate 6 is provided at its outer end. A tightening nut 14 is screwed onto the lock bolt 11 on the outside of the frame plate 6, and the frame plate 6 is sandwiched between the load-receiving nut 12 and the tightening nut 14, thereby restraining the rotating arm plate 7 to the frame plate 6. The corresponding tapered surface 13a of the tapered washer 13 is brought into close contact with the tapered surface 10b along the periphery of the elongated hole 10 through which the lock bolt 11 passes, thereby creating a wedge effect.

Claims

1. A constant hanger comprising: a case containing a spring with the axis of the spring oriented horizontally and supported by a structure; a pair of parallel frame plates fixed to one end of the case; a tension bolt pulled into the case by the spring; and a pair of parallel rotating arm plates positioned inside the pair of frame plates, pivotally supported by the frame plates at three different first vertices, with one end of the tension bolt pivotally attached at the second vertex, and the upper end of a suspended member connected to a suspended member pivotally supported at the third vertex, wherein the spring is provided to apply the vertical suspension load of the suspended member, and the rotating arm plates are restrained at any relative rotational angle position with respect to the frame plates by lock bolts passing through bolt insertion holes in the rotating arm plates and arc-shaped elongated holes in the frame plates, The rotating arm plate is rotatably penetrated by a threaded cylinder portion that is screwed onto the lock bolt and can move back and forth, and the outer end of the threaded cylinder portion is provided so as to be interposed between the rotating arm plate and the frame plate, and the load-receiving nut is provided so as to be able to move away from the inner surface of the frame plate, The frame plate is equipped with a tightening nut that is screwed onto the lock bolt on the outside of the frame plate, A constant hanger characterized in that the frame plate is sandwiched between the tightening nut and the flange portion of the load-receiving nut, thereby preventing the movement of the lock bolt within the elongated hole and allowing the rotating arm plate to be restrained at any rotational angle relative to the frame plate.

2. The constant hanger according to claim 1, wherein the frame plate is equipped with a locking mechanism that includes a washer inserted through the lock bolt and engaging with the peripheral edge of the elongated hole to prevent the lock bolt from moving downward, and the movement of the lock bolt within the elongated hole is prevented by engaging the washer with the frame plate.

3. The locking mechanism comprises a tapered ring portion formed on the outer surface of the frame plate along the periphery of the elongated hole in the frame plate, and having a tapered surface that gradually increases in thickness downward along the elongated hole, The frame plate is rotatably inserted around the lock bolt on the outside of the frame plate and comprises a tapered washer having a corresponding tapered surface that is in close contact with the tapered surface of the tapered ring, The constant hanger according to claim 2, characterized in that the corresponding tapered surface is brought into close contact with the tapered surface and the tightening nut is tightened.

4. The locking mechanism includes an engaging ring portion having an engaging surface with alternating thickness-direction grooves and protrusions formed on the outer surface of the frame plate along the periphery of the elongated hole in the frame plate, The frame plate is rotatably inserted around the lock bolt on its outer side and comprises a locking washer having a corresponding engaging surface at its bottom that engages with the locking ring, The constant hanger according to claim 2, characterized in that the corresponding engaging surface is engaged with the engaging surface and the tightening nut is tightened.

Images