Patent ID: 7574912
Filing Date: 2009-08-18
Classification: G01F,G01N

Abstract:
1. A liquid level measuring device for measuring liquid levels in a container, comprising: an elongate handle; an elongate frame arranged in telescoping relationship with the elongate handle, the elongate frame being movable between a collapsed position for storage and an extended position for usage; a float arranged to be movable lengthwise along the elongate frame, the float having a passage therethrough; a control rod arranged to extend lengthwise in the elongate frame and to extend through the passage in the float, the control rod being movable between a locked position in which the float is constrained against movement relative to the elongate frame and an unlocked position in which the float is free to move relative to the elongate frame; a sleeve having a longitudinal generally cylindrical passage therethrough mounted to the control rod; a pin having an end mounted to the frame and a portion that extends into the passage in the sleeve, the pin and sleeve cooperating to retain the control cocntrol rod in longitudinal alignment with the frame; and an actuator connected to the control rod and arranged to actuate the control rod to move the float from the locked position to the unlocked position in response to a downward pressure between a lower end of the elongate frame and a bottom surface of the container so that the float is free to seek the liquid level in the container and to move the float from the unlocked position back to the locked position when the downward pressure is released, the actuator including an elongate housing having a guide slot formed in a wall portion thereof that makes an angle with the lengthwise axis of the housing, a shaft mounted within the housing and having an end connected to an and of the control rod a guide pin extending from the shaft through the guide slot such that lengthwise movement of the shaft in the housing rotates the shaft and the control rod about their lengthwise axes to move the control rod between the float locked position and the float unlocked position.