Electric vacuum cleaner and nozzle unit therefor

An electric vacuum cleaner comprising:

• a nozzle unit kept in contact with a surface to be cleaned for dust suction;
• an extension pipe coupled to the nozzle unit;
• a hose coupling the extension pipe to a body of the electric vacuum cleaner;
• a coupling member arranged between the extension pipe and the hose;
• a handle provided on the coupling member so as to be held by a user during cleaning, the handle being formed in a shape of a hollow cylinder;
• and
• an auxiliary nozzle slidable inside the handle, the auxiliary nozzle, when the extension pipe is removed from the coupling member, being moved out at a portion of the coupling member at which the extension pipe has been coupled to the coupling member so as to protrude from the coupling member and communicate with the hose.

An electric vacuum cleaner comprising:

• a nozzle unit kept in contact with a surface to be cleaned for dust suction;
• an extension pipe coupled to the nozzle unit;
• a hose coupling the extension pipe to a body of the electric vacuum cleaner;
• and
• a handle provided at an end of the extension pipe so as to be held by a user during cleaning, the handle being coupled to the extension pipe so as to be rotatable coaxially with the extension pipe.

A nozzle unit for an electric vacuum cleaner, comprising:

• a body case having a nozzle open toward a surface to be cleaned, the body case having a substantially rectangular shape as seen in a plan view;
• a first pipe that has a first air flow passage for allowing passage of a flow of air sucked in through the nozzle and that is coupled to the body case so as to be rotatable about a rotation axis parallel to a direction of longer sides of the nozzle, the first pipe having a sliding portion that slides along the body case as the first pipe rotates, the sliding portion arranged inside the body case as seen in a plan view;
• and
• a second pipe rotatably coupled to the first pipe, the second pipe having a second air flow passage that communicates with the first air passage.

A nozzle unit for an electric vacuum cleaner, comprising:

• a body case having a nozzle open toward a surface to be cleaned;
• a suction pipe rotatably coupled to the body case so as to allow passage of a flow of air sucked in through the nozzle, the suction pipe having a sliding portion that has an arc-shaped cross section and that slides along an inner surface of the body case;
• and
• a rotary brush rotatably arranged inside the sliding portion.