Suction cleaner

• US 4,940,474 A
• Filed: 05/11/1989
• Issued: 07/10/1990
• Est. Priority Date: 05/25/1988
• Status: Expired due to Fees

• Current Assignee: Aktiebolaget Electrolux
• Original Assignee: Aktiebolaget Electrolux
• Inventors: Tuvin, Lars G., Kilstrom, Lars G., Svanberg, Joakim A., Larsson, Anders E. C.
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US07/351,077
• Time in Patent Office: 425 Days
• Field of Search: 55/213, 55/214, 55/DIG. 3, 55/34, 55/271, 55/21
• US Class Current: 96/397
• CPC Class Codes: A47L 9/2821 Pressure, vacuum level or airflow
• CPC Class Codes: A47L 9/2842 Suction motors or blowers
• CPC Class Codes: A47L 9/2889 Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
• CPC Class Codes: Y10S 55/34 Indicator and controllers

Abstract

In a suction cleaner comprising a housing (10) having an inlet (11), a filter chamber (12) with a filter bag (13), a suction fan (14) with a motor (15), and an outlet passage (17) through which filtered air passes from the suction fan to an outet (16), the motor is provided with a control circuit (20) adapted to be activated by a first pressure switch (21) which is actuated by the underpressure in the filter chamber (12) in order to control the motor power at a predetermined level. According to the invention, the suction cleaner is provided with a second pressure switch (22) which is actuated by the pressure in the outlet (17) and adapted to activate the control circuit (20) when said pressure exceeds a predetermined level.

Claims

1. In a suction cleaner having a housing (10) including an inlet (11) for dust-laden air, a filter chamber (12) with a filter bag (13), a suction fan (14), a motor (15), and an outlet passage (17) through which filtered air flows from said suction fan to an outlet (16), said motor (15) having a control circuit (20) including a first pressure switch (21) communicating with the filter chamber and actuated by the underpressure in the filter chamber to control the motor speed below a predetermined level, the improvement comprising a second pressure switch (22) communicating with the outlet passage, the second pressure switch (22) being actualable by the pressure in the outlet passage (17) and being connected to the control circuit (20) to limit fan speed when said pressure in the outlet passage exceeds a predetermined level, both of said pressure switches (21, 22) being interconnected in parallel.