The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2005
Filed:
Jan. 24, 2003
Matthew O. Herhold, Fenton, MI (US);
Matthew O. Herhold, Fenton, MI (US);
NLB Corp., Wixom, MI (US);
Abstract
A two-handle cleaning lance includes a pair of switches which must be held closed by an operator to allow high pressure water to be directed to a discharge nozzle. A dump valve is selectively actuated to dump the high pressure water to a dump nozzle at which it will enter the environment at a much reduced pressure. The dump valve is operated by a control which monitors that the two switches are both held closed. If either switch is released, then the dump valve is moved to a dump position. The present invention ensures that an operator does not disable one of the two switches such as by taping it closed. The dump valve will not move back to its actuated position until both switches have been released and have moved to an open position.