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US 4,057,938 AGranted
Portable sand blasting device
OwnerJohn H. Rohlfsinventor
Life of this patent
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OwnerJohn H. Rohlfsinventor
Estimating the term…
A portable sand blasting device comprising a housing adapted to be held and manipulated manually and to support an electric motor having a rotatable output shaft. An impeller is mounted on the motor output shaft and has an inlet opening communicating with an inlet chamber which receives air and entrained sand through a conduit extending to a sand pouch adapted to be carried on the body of the operator. The impeller also has a plurality of radial passageways each of a generally circular configuration but with a somewhat "V"-shaped trailing wall. A spiral discharge chamber receives the air and entrained sand from outer end of the impeller passageways and conducts the same to a discharge opening and an associated nozzle. The spiral discharge chamber has a "V"-shaped outer wall with the open end of the "V" facing the impeller. An annular series of small apertures in a housing member adjacent the impeller inlet chamber provides for the entry of additional ambient air and a rotatable disc thereabove has a similar annular series of apertures. The disc may be rotated to align and to misalign the apertures in varying degrees whereby to regulate air flow.
A portable sand blasting device comprising a housing adapted to be held and manipulated manually, an electric motor supported by the housing and having a rotatable output shaft, electrical conductor means for connecting the motor to a source of electrical power, a high speed air and sand impeller mounted on the motor output shaft and having inlet and discharge openings respectively for receiving and discharging air and entrained sand and at least one air and sand passageway interconnecting said inlet and discharge openings, at least one additional air inlet opening for said impeller, nozzle means arranged to receive air and entrained sand from said discharge opening and to discharge a high speed stream of air and sand for a blasting operation, a sand receptacle for holding a supply of sand, and air and sand supply conduit means connected between sand in said receptacle and said impeller inlet opening.
A portable sand blasting device comprising a housing adapted to be held and manipulated manually, an electric motor supported by the housing and having a rotatable output shaft, electrical conductor means for connecting the motor to a source of electrical power, a high speed air and and impeller mounted on the motor output shaft and having inlet and discharge openings respectively for receiving and discharging air and entrained sand and at least one air and sand passageway interconnecting said inlet and discharge openings, said impeller including a central inlet chamber for receiving air and entrained sand from said inlet opening, and said impeller passageway extending generally radially outwardly from said inlet chamber toward said discharge opening, said impeller passageway serving both to impell air and entrained sand and physically to engage sand particles against its wall and throw the same toward said discharge opening, nozzle means arranged to receive air and entrained sand from said discharge opening and to discharge a high speed stream of air and sand for a blasting operation, a sand receptacle for holding a supply of sand, and air and sand supply conduit means connected between sand in said receptacle and said impeller inlet opening.
A portable sand blasting device comprising a housing adapted to be held and manipulated manually, an electric motor supported by the housing and having a rotatable output shaft, electrical conductor means for connecting the motor to a source of electrical power, a high speed air and sand impeller mounted on the motor output shaft and having inlet and discharge openings respectively for receiving and discharging air and entrained sand and a plurality of generally radial air and sand passageways interconnecting said inlet and discharge openings, said passageways each communicating continuously with said inlet opening, nozzle means arranged to receive air and entrained sand from said discharge opening and to discharge a high speed stream of air and sand for a blasting operation, a sand receptacle for holding a supply of sand, and air and sand supply conduit means connected at its discharge end with said impeller inlet opening and having its inlet end in said receptacle whereby to create a suction sufficient to draw air and entrained sand through the conduit means.
A portable sand blasting device comprising a housing adapted to be held and manipulated manually, an electric motor supported by the housing and having a rotatable output shaft, electrical conductor means for connecting the motor to a source of electrical power, a high speed air and sand impeller mounted on the motor output shaft and having inlet and discharge openings respectively for receiving and discharging air and entrained sand and a plurality of generally radial air and sand passageways interconnecting said inlet and discharge openings, said passageways each communicating continuously with said inlet opening, nozzle means arranged to receive air and entrained sand from said discharge opening and to discharge a high speed stream of air and sand for a blasting operation, a sand receptacle for holding a supply of sand, air and sand supply conduit means connected between sand in said receptacle and said impeller inlet opening, and means providing for an air flow to said impeller to supplement the air flow through said supply conduit means.
A sand blasting device comprising a housing, an electric motor supported by the housing and having a rotatable output shaft, electrical conductor means for connecting the motor to a source of electrical power, a high speed air and sand impeller mounted on the motor output shaft and having inlet and discharge openings respectively for receiving and discharging air and entrained sand and a plurality of generally radial air and sand passageways interconnecting said inlet and discharge openings, said passageways each communicating continuously with said inlet opening, nozzle means arranged to receive air and entrained sand from said discharge opening and to discharge a high speed stream of air and sand for a blasting operation, a sand receptacle for holding a supply of sand, and air and sand supply conduit means connected at its discharge end with said impeller inlet opening and having its inlet end in said receptacle whereby to create a suction sufficient to draw air and entrained sand through the conduit means.
Dependencies are inferred from the claim text.