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. 12, 1988
Filed:
Aug. 29, 1986
Edward J Stropkay, Mentor, OH (US);
Robert W Boucher, Dayton, OH (US);
Transgard, Inc., Willoughby, OH (US);
Abstract
A level warning device for dump trucks comprises a light transmissive tubular trackway having raised, closed ends and a mount for securing the tubular trackway to a transverse member of the bed of the truck. The trackway includes a detent at a central location which defines a pocket lateral of the passage defined within the trackway. The trackway itself comprises straight, tubular segments which are inclined with respect to a horizontal axis at angles equal to the critical angle at which the truck would likely start to turn over. Positioned above a central region of the trackway is a photo-electric switch. Optically aligned with the photo-electric switch from below the trackway is an element for emitting an infra-red beam through the tubular element. A ball which is sized to roll freely in the trackway and the pocket is held within the detent pocket while the bed is in a lowered position by reason of the inclination of the detent at such conditions. While in the pocket, a portion of the ball prevents the beam from striking the photo-electric switch.