초록 ▼

An extender device and system for adjusting the height of a crossbar analogue in pole vault, high jump, horse jumping or other crossbar clearing activities. The system may include a plurality of pulley like devices that maintain a cord spaced about a practice structure. A crossbar analogue is couple

An extender device and system for adjusting the height of a crossbar analogue in pole vault, high jump, horse jumping or other crossbar clearing activities. The system may include a plurality of pulley like devices that maintain a cord spaced about a practice structure. A crossbar analogue is coupled to the cord and the cord arranged so that the crossbar analogue may be readily moved upward or downward. An extender is disclosed that facilitates arrangement and movement of the cord and crossbar analogue in this manner.

대표청구항 ▼

The invention claimed is: 1. A system for adjusting the height of a crossbar, comprising:a first and a second vertically disposed supports;a first and a second unidirectional cord passing structures, each respectively coupled to the first and second vertical supports;a first and a second multiple an

The invention claimed is: 1. A system for adjusting the height of a crossbar, comprising:a first and a second vertically disposed supports;a first and a second unidirectional cord passing structures, each respectively coupled to the first and second vertical supports;a first and a second multiple and bidirectional cord passing structures, each respectively coupled to the first and second vertical supports;a cord of sufficient length to continuously pass through the first and second unidirectional structures and the first and second bidirectional structures as those structures are mounted on the vertical supports;a mechanism for releasably coupling two ends of the cord to achieve the continuous cord arrangement; anda crossbar analogue that is configured for releasable attachment to the cord at two locations that are substantially horizontally level;wherein the cord is arranged in the passing structures such that upward or downward movement of the cord proximate one of the vertical supports causes a similar upward or downward movement of the cord proximate the other vertical support such that the crossbar analogue moves up or down while maintain a substantially level position.