Rocking pendulum |
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| 申请号 | US24154072 | 申请日 | 1972-04-06 | 公开(公告)号 | US3808793A | 公开(公告)日 | 1974-05-07 |
| 申请人 | PERRY LTD E; | 发明人 | EBDON R; | ||||
| 摘要 | A device capable of providing audible oscillatory movement of a body about a position of stable equilibrium is disclosed. The body normally rests on two edges, but when displaced therefrom will oscillate about the position making an audible ''''click'''' as it steps from one edge to the other. | ||||||
| 权利要求 | 1. An improved device adapted to make a regular audible sound when oscillatorily moved on a support surface, about a position of stable equilibrium comprising: a body having defined thereon two, co-planar, spaced apart edges, with the edges being spaced from and positioned on either side of a vertical plane including the center of gravity of the body and being adapted to contact a support surface; the body being capable of oscillatory movement on the support surface, and about a position of stable equilibrium, upon the displacement of the body from its position of stable equilibrium so that during said oscillatory movement, only one or the other of said edges is in contact with the support surface; and means for biasing the body toward its position of stable equilibrium from a predetermined displacement so that the body will oscillate from one edge to the other edge until it resumes its position of stable equilibrium. 2. A device according to claim 1 wherein the means biasing the body toward the position of stable equilibrium comprise at least one weight which weight or weights, when the body is displaced from the position of stable equilibrium, exert a moment on the body to bias the body toward the equilibrium. 3. A device according to claim 1 wherein the edges are a predetermined distance apart and wherein the means biasing the body toward the position of stable equilibrium are such that the body oscillates for a fixed period of time when released from the predetermined displacement. 4. A device according to claim 1 wherein the edges are substantially parallel. 5. A device according to claim 1 comprising a body having an arcuate effective surface upon which the body may roll broken by the two edges, two linear surface tangential with the arcuate surface and extending from points thereon symmetric about the edges, which linear surfaces define the predetermined displacement. 6. A device according to claim 5 wherein the linear surface converge at a point, which point is on a line extending from a position midway between the edges through the centre of curvature of the arcuate surface. 7. A device according to claim 6 wherein the arcuate effective surface is cylindrical. 8. A device according to claim 7 wherein the arcuate effective surface comprises two similar spaced, parallel, discontinuous rails, the discontinities of which define the edges. 9. A device according to claim 1 wherein the body comprises a pendulum arm suspended on the two edges wherein the biasing means includes a weight moveably attached to the pendulum remote from the point of suspension; and wherein the device includes a releaseable catch to hold the remote end of the pendulum arm at the predetermined displacement. 10. A device according to claim 9 wherein the pendulum has as its point of edge suspension two knife edges directed towards opposite sIdes of the pendulum resting on the support surface, said support surface comprising a discontinuous surface in the device; and wherein the arm of the pendulum passes through the discontinuity. 11. A device according to claim 9 wherein the pendulum has at its point of edge suspension a planar surface directed towards the remote end of the pendulum adapted to rest on the two edges comprising knife edges fixed in the device. |
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