Self cleaning rotary lawn mower blade and deck assembly
US3959955A · kind A · utility
Inventors
Key dates
| Filing date | Apr 24, 1975 |
| Grant date | Jun 1, 1976 |
| Priority date | — |
| Expiry date | Apr 24, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D2101/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A self cleaning rotary lawn mower blade and deck assembly in which the lawn mower blade is provided with metal pins symmetrically mounted on opposite sides of the opening for the center shaft, the tops of the pins being spaced from the deck by a critical distance of one-fourth of an inch + or - 1/32 of an inch and being spaced from each other on from 2 to 4 inch centers, so that a 5 inch blade need only have four pins total, half on one side and half on the other side. The mounting of the pin is such that the pin shank whips through an angle of about 30.degree., e.g., about 15.degree. each side of the normal vertical position and this whipping action which takes place during rotation of the blade removes debris, clippings, and the like which tend to adhere to the underside of the deck.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.