Shock-resistant floor-supporting strut unit which can bear a heavy load thereon

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
4, 5 and 6, a first preferred embodiment of a floor-supporting strut unit according to this invention is shown to include a base 50 having a fixed vertical tube 501, a generally circular top plate 70, an externally threaded vertical rod 71 secured to and below the center of the top plate 70 in a known manner, a rectangular auxiliary plate 72, a stop nut 73, a cap 74 and a disk spring 75.
The top plate 70 has four angularly equidistant coupling units, each of which has two parallel outer slots 700, 701 between which a connecting plate section 702 is defined.
Each of the connecting plate sections 702 has a fastener hole 7020 formed therethrough.
As illustrated, each of the top plates 70 can be coupled with four main horizontal tubes 60, each of which has two parallel, vertical side walls 600, 601, a horizontal top wall 602 formed with a through-hole 603, a horizontal bottom wall 604 formed with a threaded hole 605, and an inclined end surface 606.
The side walls 600, 601 of each of the main horizontal tubes 60 are inserted respectively into two outer slots 700, 701 in the corresponding top plate 70 so as to permit a bolt (B2) to extend through the through-hole 603 in the top wall 602 and the corresponding fastener hole 7020 in the corresponding top plate 70 to engage a nut (not shown) in a known manner.
In the strut unit according to the first preferred embodiment, the threaded vertical rod 71 extends downward through a threaded hole 72H in the auxiliary plate 72, the stop nut 73, a central bore 75H of the disk spring 75 and a threaded hole 74H in the cap 74 and into the open end of the vertical tube 501 of the base 50.
The spring 75 abuts against a bottom of the stop nut 73 at a top thereof and a top of the cap 74 at a bottom thereof, thereby supporting the assembly of the stop nut 73 and the vertical rod 71 on the spring 75, which is supported on the cap 74 and the base 50.
Each of the rectangular auxiliary plates 72 has eight radially extending inner slots 721 which are angularly equidistant