20130192095 | Undercutter self adjusting and shock absorbing device - A self adjusting chain mechanism for use with an undercutter attached to an excavator having hydraulic means for adjusting the undercutter; the self adjusting mechanism has a chain and sprocket assembly in a sprocket holding frame, a ram and piston, all operating in conjunction with the hydraulics of the excavator with a control system to move an adjuster shaft connected to the chain sprocket assembly, so as to cause the chain to tighten in response to the changes in hydraulic pressure. | 08-01-2013 |