Electric vacuum cleaner

An electric vacuum cleaner comprising:

• an appliance housing, composed of and separated into a dust collecting casing having a dust collecting chamber and a motor casing having an electric fan therein;
• and
• engaging means, disposed in said dust collecting chamber, for detachably engaging a dust collecting bag,
• said dust collecting bag being adapted to be removed through an opening of said dust collecting casing where said dust collecting casing is joined to said motor casing, and said dust collecting casing being constructed such that the dust collecting casing gradually increases in width toward said opening of said dust collecting casing;
• air-sealing means for hermetically sealing the adjoining area of said dust collecting casing and said motor casing;
• and
• a groove portion for prohibiting said air-sealing means from projecting inward toward an inner surface of said dust collecting casing.

An electric vacuum cleaner comprising:

• an appliance housing, composed of and separated into a dust collecting casing having a dust collecting chamber and a motor casing having an electric fan therein;
• and
• engaging means, disposed in said dust collecting chamber, for detachably engaging a dust collecting bag,
• said dust collecting bag being adapted to be removed through an opening of said dust collecting casing where said dust collecting casing is joined to said motor casing, and said dust collecting casing being constructed such that the dust collecting casing gradually increases in width toward said opening of said dust collecting casing;
• an operation-disabling means for disabling the operation of the cleaner when said dust collecting bag is not engaged in said engaging means.