Torsion board

DETAILED DESCRIPTION OF THE INVENTION BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING In drawings which illustrate embodiments of the invention, FIG.
1 is a plan view of a torsion board according to a first embodiment of the invention; FIG.
2 is side elevation of the torsion board of FIG.
1; FIG.
3 is a perspective view of a resilient interconnecting member having a hollow core, according to the first embodiment of the invention; FIG.
4 is a perspective view of a resilient interconnecting member having a solid core, according to the first embodiment of the invention; and FIG.
5 is a side elevation of a resilient interconnecting member according to a second embodiment of the invention.
FIG.
6 is a plan view of the apparatus of FIG.
5.
FIG.
7 is a perspective view of a clamping insert according to the second embodiment of the invention.
FIGS.
1 and 2: Referring to FIGS.
1 and 2, a torsion board according to the first embodiment of the invention is shown generally at 10.
The board includes a generally planar, elongated user platform 12 for supporting a user, a similar, generally planar ground platform 14 for supporting the torsion board 10 on a generally horizontal floor or ground surface 15 and a resilient interconnecting member 16.
The ground platform 14 thus acts as a ground contacting member.
The resilient interconnecting member is preferably affixed to the platforms with a plurality of bolts 17, nuts 18, and pressure plates 19.
The resilient interconnecting member permits the user, when upon the user platform 12, to effect rotation of the user platform 12 about a first, generally vertical axis 22 relative to the ground platform 14, while maintaining the user platform 12 in a plane generally parallel to the ground 15 by balancing.
The balancing being effected by minimizing pivoting of the user platform 12 about generally horizontal second and third axes 23 and 24.
The first axis 22 is generally coincident with a gravitational axis along which gravitational forces act upon the user