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Disclosed is a multipurpose auxiliary brush for complementing a cleaning function of a main brush and for enabling a vacuum cleaner to perform various cleaning jobs, regardless of an object and place to be cleaned. A knife-type brush of the multipurpose auxiliary brush is adapted to clean a recessed

Disclosed is a multipurpose auxiliary brush for complementing a cleaning function of a main brush and for enabling a vacuum cleaner to perform various cleaning jobs, regardless of an object and place to be cleaned. A knife-type brush of the multipurpose auxiliary brush is adapted to clean a recessed surface such as a doorframe, a windowframe, or a recessed place in a room. The multipurpose auxiliary brush is mounted to a hose assembly of the vacuum cleaner through an end of the knife-type brush. A haired brush of the multipurpose auxiliary brush is adapted to clean a recessed cleaning surface on which dust or other foreign substances has piled up, such as a doorframe, a windowframe, or a recessed place in a room. The haired brush is slideably positioned on a first portion of the knife-type brush. A plurality of hairs made of a synthetic thread are attached to an end of the haired brush. A carpet cleaning brush of the multipurpose auxiliary brush is adapted to beat and clean a variety of indented cleaning surfaces such as a sofa, a carpet, or a foot board made of woven goods. The carpet cleaning brush is slideably positioned on the haired brush. The carpet cleaning brush can protrude ahead of the front portion of the knife-type brush and can be arranged in a fan shape.

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[ What is claimed is:] [20.] A multipurpose auxiliary brush for a vacuum cleaner, said multipurpose auxiliary brush comprising:(a) a first auxiliary brush for complementing a cleaning function of a main brush, said first auxiliary brush being adapted to clean a recessed surface and being mounted on

[ What is claimed is:] [20.] A multipurpose auxiliary brush for a vacuum cleaner, said multipurpose auxiliary brush comprising:(a) a first auxiliary brush for complementing a cleaning function of a main brush, said first auxiliary brush being adapted to clean a recessed surface and being mounted on a hose assembly of the vacuum cleaner through an end thereof, and said first auxiliary brush including a front portion and a rear portion, in which said front portion has a first air flow passage formed through an interior of said front portion, and said rear portion has a second air flow passage formed through an interior of said rear portion, and said front portion includes a first locking groove and a second locking groove, said first locking groove is formed on an outer periphery of a front end of said first portion, and said second locking groove is formed on an outer periphery of a rear end of said front portion, and a diameter of said rear portion is larger than a diameter of said front portion, and a first shoulder is formed between said front portion and said rear portion, and said first air flow passage is pneumatically connected with said second air flow passage, and a diameter of said second air flow passage is larger than a diameter of said first air flow passage;(b) a second auxiliary brush for complementing a cleaning function of a main brush, said second auxiliary brush being adapted to clean a recessed surface and being slideably mounted on said front portion, and said second auxiliary brush including a plurality of hairs attached to an end thereof, and including a plurality of first protrusions, and including a first locking protrusion formed on an inner periphery of said second auxiliary brush and extending in the inward direction, in which said first protrusions are formed on an outer periphery of said second auxiliary brush and extending in the longitudinal direction of said second auxiliary brush, and said first locking protrusion is selectively inserted into said first locking groove or said second locking groove when said second auxiliary brush is slideably positioned on said first portion, and guide grooves are formed on upper portions of said first protrusions, and third locking grooves are formed on front ends of said guide grooves, and said second auxiliary brush has a cylindrical-shape, and one side of said second auxiliary brush is cut off; and(c) a third auxiliary brush for complementing a cleaning function of a main brush, said third auxiliary brush being adapted to clean an indented surface of predetermined woven goods and being slideably mounted on said second auxiliary brush under the state where said second auxiliary brush is mounted on said front portion, said third auxiliary brush including a first semi-circle shaped portion and a second semi-circle shaped portion which are separated from each other, in which said first semi-circle shaped portion includes a plurality of first prominences and depressions formed at an inner lower portion of said first semi-circle shaped portion, and includes a plurality of first taper portions formed at an end of said first semi-circle shaped portion, and said second semi-circle shaped portion includes a plurality of second prominences and depressions formed at an inner lower portion of said second semi-circle shaped portion, and includes a plurality of second taper portions formed at an end of said second semi-circle shaped portion, and a first cut-off portion is formed between said first taper portions, and a second cut-off portion is formed between said second taper portions, and a second shoulder is formed at a lower portion of said first taper portion, and a third shoulder is formed at a lower portion of said second taper portion.