Trigger Sprayer Actuator/Measurer

This is a device which measures the displacement versus time of a trigger sprayer and actuates the trigger for various types of trigger sprayers. It can be used to test trigger sprayers and products in a repeatable way.

The measurement portion of the device consists of an angular position transducer (optical encoder) mounted to a rigid threaded ring. The trigger sprayer head is screwed onto the ring. The position transducer is connected to the trigger with an adjustable clamp. The operator can adjust the clamp so that the location of the axis of the transducer coincides with the axis of rotation of the trigger. The device measures the position of the spray trigger to within an accuracy of 1/10 of a degree of arc 500 times per second

The actuation portion of the device consists of a digitally controlled servo actuator which pulls in the trigger while an optical encoder measures the position. The actuator is controlled by a computer. The device also records the torque applied to the trigger using a miniature load cell. The device is connected to the customers computer with a serial link. The device can be programmed to actuate the trigger sprayer repeatedly at various speeds with an actuation profile just like that used by a person. Actuation profiles can include short strokes or multiple strokes. The actuator will provide up to 30 in-lb. force at up to 360 degrees/sec. Software which allows the position vs. time data to be stored and plotted out in a position versus time format is included.

Shown above is an example of the measured trigger angle and torque vs. time for a typical trigger sprayer. This recording was made by the trigger sprayer actuator. These device are used by a number of major companies in the industry to test their products and triggers.