Hurdle with counterweight

摘要

A hurdle with movable gate tubes that telescope upon uprights has an automatically movable counterweight inside each leg. Each counterweight is attached to two cables. The first cable runs from the leading end of the counterweight to a cable guide inside the leading end of each leg, then to a cable guide at the intersection of the leg and the upright, then to an actuating rod. The second cable runs from the trailing end of the counterweight to a cable guide at the intersection of the leg and the upright, then to a cable guide near the top of the upright, and then to the actuating rod.

主权项

1. A hurdle comprising:
(a) two substantially parallel horizontal hollow legs, each leg having a leading end and a trailing end; (b) two stationary hollow uprights, each upright extending upwardly from the trailing end of a leg, and defining an intersection between a leg and an upright; (c) two movable hollow gate tubes, each gate tube telescoping relative to an upright and having a top end; (d) a gate board connecting the top ends of the gate tubes; (e) a mechanism for adjusting the gate board to a plurality of heights; (f) a counterweight inside each leg, each counterweight being movable horizontally and having a leading end and a trailing end; (g) a first cable guide attached inside the leading end of each leg; (h) a second cable guide attached inside each intersection between a leg and an upright; (i) a third cable guide attached inside each upright; (j) a vertical actuating rod inside each gate tube, each actuating rod having a top and a bottom, each top being attached to the gate tube; (k) a first cable connected to the leading end of each counterweight, then running horizontally to and around each first cable guide, then running horizontally to and around each second cable guide, then running vertically to and connecting with the actuating rod; and (l) a second cable connected to the trailing end of each counterweight, then running horizontally to and around each second cable guide, then running vertically to and around each third cable guide, and then running vertically to and connecting with the actuating rod.