Kevin Hickey (Patent): IPO 7 Jun 2012
The invention concerned a device for showing correct ladder angle, comprising a weighted indicator connected via a hoop to a semi-circular rail, positioned near the top of a symbol ‘A’. The indicator moved along the rail as the ladder incline changed. Correct ladder angle was shown by alignment with a marking within a limb of … Continue reading Kevin Hickey (Patent): IPO 7 Jun 2012