ELECTRIC VACUUM CLEANER

• US 3,577,869 A
• Filed: 08/05/1968
• Issued: 05/11/1971
• Est. Priority Date: 08/09/1967
• Status: Expired due to Term

• Current Assignee: Asanari Shigeyuki, Hosokawa Tomoyuki, Tsugeki Toshii
• Original Assignee: Asanari Shigeyuki, Hosokawa Tomoyuki, Tsugeki Toshii
• Inventors: HOSOKAWA TOMOYUKI, TSUGEKI TOSHII, ASANARI SHIGEYUKI
• Application Number:
  US04/750,046
• Time in Patent Office: 1,009 Days
• US Class Current: 55/361
• 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 9/2857 User input or output elements for control, e.g. buttons, switches or displays
• 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: H02K 23/66 Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
• CPC Class Codes: H02K 9/06 with fans or impellers driven by the machine shaft
• CPC Class Codes: H02P 25/14 Universal motors H02P25/12 takes precedence

Abstract

An electric vacuum cleaner in which a thyristor is provided to control the input to an electric motor driving a blower so as to adjust the flow of insucked air. In the cleaner, the thyristor is disposed in the path of airstream through the cleaner casing so that it can be subject to forced cooling, and means responsive to a variation in the pressure or in the airflow is provided to vary the phase corner the gate circuit of the thyristor for controlling the flow of insucked air.

Claims

1. An electric vacuum cleaner comprising a main casing defining therewithin a passage for dust laden air drawn thereinto, a dustcollecting filter in said main casing, a blower driven by an electric motor disposed within said main casing behind said dustcollecting filter, and a thyristor equipped with a heat-radiating member for controlling the input to said motor, said thyristor being disposed in the space between said dust-collecting filter and said blower in such a relation that it is exposed to the airstream passing through said main casing, and control means for controlling the conduction angle of said thyristor to obtain the most suitable airflow for particular objects to be cleaned.

2. An electric vacuum cleaner comprising a main casing defining therewithin a passage of air insucked with dust, a dust-collecting filter in said main casing, a blower driven by an electric motor disposed within said main casing behind said dust-collecting filter, a thyristor equipped with a heat-radiating member for controlling the input to said motor, said thyristor being disposed in the space between said dust-collecting filter and said blower in such a relation that it is exposed to the airstream passing through said main casing, and at least one perforation provided in the wall of said main casing and communicating with said space so as to supply cooling air into said space, and control means for controlling the conduction angle of said thyristor to obtain the most suitable airflow for particular objects to be cleaned.

3. An electric vacuum cleaner comprising a main casing defining therewithin a passage of air insucked with dust, a dust-collecting filter in said main casing, a blower driven by an electric motor disposed within said main casing behind said dust-collecting filter, a thyristor equipped with a heat-radiating member for controlling the input to said motor, said thyristor being disposed in the space between said dust collecting and said blower, and a shielding casing covering said thyristor and defining therewithin a path of air which communicates with said passage of air through said main casing, and control means for controlling the conduction angle of said thyristor to obtain the most suitable airflow for particular objects to be cleaned.

4. An electric vacuum cleaner comprising a main casing defining therewithin a passage of air insucked with dust, a dust-collecting filter in said main casing, a blower driven by an electric motor disposed within said main casing behind said dust-collecting filter, a thyristor equipped with a heat-radiating member for controlling the input to said motor, said thyristor being disposed in the space between said dust-collecting filter and said blower, at least one perforation provided in the wall of said main casing and communicating with said space so as to supply cooling air into said space, and a shielding casing covering said thyristor and defining therewithin a path of air which communicates with said perforation and said passage of air through said main casing.

5. An electric vacuum cleaner comprising a main casing defining therewithin a passage of air insucked with dust, a dust-collecting filter in said main casing, a blower driven by an electric motor disposed within said main casing behind said dust-collecting filter, a thyristor equipped with a heat-radiating member for controlling the input to said motor, said thyristor being disposed in the space between said dust-collecting filter and said blower, and a shielding casing covering said thyristor and defining a path of air which communicates with said space solely at the end on the downstream side of said passage of air through said main casing, and control means for controlling the conduction angle of said thyristor to obtain the most suitable airflow for particular objects to be cleaned.

6. An electric vacuum cleaner comprising a main casing defining therewithin a passage of air insucKed with dust, a dust-collecting filter in said main casing, a blower driven by an electric motor disposed within said main casing behind said dust-collecting filter, a thyristor equipped with a heat-radiating member for controlling the input to said motor, said thyristor being disposed in the space between said dust-collecting filter and said blower, at least one perforation provided in the wall of said main casing and communicating with said space so as to supply cooling air into said space, and a shielding casing covering said thyristor and defining a path of air which communicates with said perforation and with said space solely at the end on the downstream side of said passage of air through said main casing.