Vacuum suction machine with high efficiency filter and operating interlock
USRE34980E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1993 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Nov 5, 2013 |
Classification
- Technology area (CPC —)General
Abstract
A vacuum motor and fan are mounted within a housing, the lower end of which receives a high efficiency particle filter. The bottom of the housing includes a series of projections adapted to be received in corresponding apertures on an upper flange of the filter to prevent replacing the filter with an improper one. The projection/apertures also promote proper seating of the seal between the filter canister and the housing. A separate projection on the filter engages and actuates a lock-out switch carried by the housing to permit the machine to operate only when the filter is of proper size and capacity and it is properly seated on the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.