Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Dale Derry0
Date of Patent
September 13, 2011
Patent Application Number
12231323
Date Filed
August 29, 2008
Patent Citations Received
Patent Primary Examiner
Patent abstract
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.
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