Lawn mower having adjustable air vents
US5499495A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1994 |
| Grant date | Mar 19, 1996 |
| Priority date | — |
| Expiry date | Dec 28, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D2101/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Adjustable ventilation apparatus for a lawn mower, adapted to allow adjustment of the airflow rate into the cutting deck to maximize operation of the lawn mower under various operating conditions. In one embodiment, the apparatus comprises a ring disposed intermediate the engine and cutting deck of a walk behind mower, having a plurality of radial openings formed therethrough. An annular cover is provided encircling the ring, with the cover having a like number of openings formed in the peripheral wall thereof. Rotational movement of the cover relative to the ring moves the openings therein into and out of alignment with the openings in the ring, thereby defining open and closed positions for the vent, respectively. The cover may also be moved to a plurality of positions intermediate fully open and fully closed to provide the appropriate airflow into the cutting deck. An alternative embodiment provides a stationary outer cover and a rotatable ring, each having a plurality of longitudinal slots and radial openings formed therein. Selective positioning of the ring relative to the cover determines the opening size formed through the slots and the consequential airflow through the top …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.