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. 11, 1978
Filed:
Jun. 01, 1977
Leonard E Bowerman, Fairfield, CT (US);
Other;
Abstract
In accordance with the present invention, the agitator brush in the suction nozzle of an upright vacuum cleaner is positively driven by the high speed fan motor through reduction gearing, including a torque-limiting magnetic drive, which will disengage in the event the agitator brush is stalled or overloaded to thus prevent damage to the motor and conversely will limit the value of the torque transmitted to the agitator in order to minimize the damage done to whatever has stalled the brush. In some cases the value of the torque at which the magnetic drive is designed to disengage may be lower than that required to overcome the frictional resistance to turning of the agitator on the rug being cleaned plus the inertia load of the driven system during the rapid acceleration from start to full speed, which results if the motor is initially supplied with full line voltage. Hence, the invention includes means which may be employed in such cases for automatically reducing the rate of acceleration of the motor during starting, thus reducing the inertia load.