Anchoring arrangement for heavy coil springs, primarily in coil spring carried playground devices

Claim 1

A playground device comprising a generally vertically oriented coil spring, a ground supported base means for rigidly fixedly anchoring a lower end of said coil spring to a ground supported base member, a user support structure provided at a top end of the coil spring, said coil spring being adapted to carry out resilient transverse oscillations from the lower rigidly fixedly anchored end thereof in response to the user support structure being caused to rock to and fro, whereby the coil spring is bent in opposite directions between opposite bent-out positions with an operative maximum amplitude defined by a maximum degree of bending during use of the playground device, rigid abutment means are disposed adjacent the lowered rigidly fixedly anchored end of the coil spring, said rigid abutment means being associated with said base member and being adapted to cooperate with a portion of the coil spring carrying out a vertical displacement by the oscillating bending of the coil spring so as to permit the portion of the coil spring to freely carry out vertical movements to respective sides of a rest position thereof and for effectively preventing the vertical movements of the portion of the coil spring from exceeding 10-90% of a free vertical displacement of said coil spring portion by said maximum degree of bending of the coil spring during use of the playground device.