Autotracking fume extraction exhaust hood

Details Autotracking fume extraction exhaust hood Autotracking fume extraction exhaust hood

1990-10-22

1991-08-06

Joyce, Harold

B05B 1500

Patent

active

050367544

ABSTRACT:
An exhaust system for fume extraction from a work area such as the vicinity of a welding gun is provided, having an articulted exhaust duct with a fume hood mounted at the forward end thereof. A signal emitter is mounted on the work tool, and three sensors are mounted on the fume hood, one at the front and one at each side so as to form a triangle. One motor is provided at the joint between the front and rear portions of the articulated exhaust duct, and two further motors are provided at the rear end of the exhaust duct. The first motor opens and closes the angle between the front and rear portions of the exhaust duct, and the second motor moves the rear portion of the exhaust duct backward and forward in the same vertical plane as that in which the front and rear portions of the exhaust duct move under the influence of the first motor. The third motor turns the entire assembly in an arc. The sensors are set up through signal conversion circuit means to develop triangulation error signals, whereby relative motion of the emitter with respect to the sensors, and the direction of that motion, can be determined. The signal conversion circuit provides signals to drive any or any combination of the motors, to an amount necessary and in the direction necessary to neutralize the triangulation error signals and therefore to move the fume hood closer to the work tool.

REFERENCES:
patent: 4058299 (1977-11-01), Lindkvist
patent: 4163650 (1979-08-01), Watson et al.
patent: 4287405 (1981-09-01), Ohmae et al.
patent: 4724751 (1988-02-01), Jentuch et al.

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