Experimental evaluation of emergency stop buttons on hand-held teach pendants.
Proceedings of the Human Factors Society 33rd Annual Meeting, October 16-20, 1989, Denver, Colorado. Santa Monica, CA: Human Factors Society, 1989 Oct; 2:951-955
The effectiveness of emergency stop buttons on hand held teach pendants for robots was evaluated. A prototype pendant containing ten locations was studied using 12 males, 21 to 30 years old, who had no experience with industrial robots. The subjects held the pendants in their left hand while observing a robot that simulated industrial work. They were instructed to use their three middle fingers to depress and hold the touch pad down and to release the pad when a malfunction was observed and press the emergency stop button as soon as possible. The time required to reach and depress the emergency stop button was recorded. All subjects were able to reach and depress the 1in emergency stop button quicker than the the buttons more quickly when they were mounted on the front surface of the pendant. The slowest reach time for the 0.5in button occurred when it was mounted on the left side or top surface of the pendant. The slowest reach time for the 1in button occurred when it was mounted on the top surface. The author concludes that the time required to reach and depress the emergency stop button depends on its diameter and location. The author recommends that design criteria for emergency stop buttons consider that location and size can strongly influence a person's ability to locate and depress the button.
Robotics; Industrial-safety; Equipment-design; Laboratory-testing; Simulation-methods; Ergonomics; Safety-equipment
Proceedings of the Human Factors Society 33rd Annual Meeting, October 16-20, 1989, Denver, Colorado