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:
Jul. 20, 2010
Filed:
Jul. 24, 2007
David Martinez, Williamsport, PA (US);
David Martinez, Williamsport, PA (US);
Shop-Vac Corporation, Williamsport, PA (US);
Abstract
A system for locking the wheels of a dolly for a cleaning device has a brake arm that has one end that is hinged to the base of the dolly. The brake arm pivots between a disengaged position and an engaged position where a stop on an opposite end of the brake arm engages the circumference of one of the wheels on the dolly. A spring biases the brake arm to the disengaged position. The spring can be mounted on a pin that is seated on the base and extends through a slot in the brake arm. An operator-engagable lever is used to move the brake arm from one position to another. The lever can be hinged to the pin, pivoting into and out of a locked position in which the lever presses the brake arm into the engaged position. A cam surface on the lever is shaped so that moving the lever to one side of a critical point causes the lever to be biased toward the locked position, and moving the lever to the other side of the critical point causes the lever to be biased toward the unlocked position. The part of the lever that abuts the brake arm when the lever is in the locked position can be a flat section on the cam surface.