초록 ▼

An sanding/polishing apparatus which has a motor including a body and a working head which is mounted on the body for sanding/polishing movement relative to the body and to a surface to be treated and includes means for attachment of an abrasive or polishing material to the working head. A feed line

An sanding/polishing apparatus which has a motor including a body and a working head which is mounted on the body for sanding/polishing movement relative to the body and to a surface to be treated and includes means for attachment of an abrasive or polishing material to the working head. A feed line is provided in the motor for directing a cold gas flow through the body and working head to the surface to be treated, and a cold gas flow is fed to that feed line through a vortex tube mounted on the body that significantly reduces the temperature of the air delivered to the feed line.

대표청구항 ▼

1. An apparatus for sanding or polishing a surface comprising: a motor including a body and a working head which is mounted on said body for sanding/polishing movement relative to said body and to the surface to be treated, said working head including means for attachment of an abrasive or polish

1. An apparatus for sanding or polishing a surface comprising: a motor including a body and a working head which is mounted on said body for sanding/polishing movement relative to said body and to the surface to be treated, said working head including means for attachment of an abrasive or polishing material to said working head, feed line means for directing a cold gas flow through said body and working head to the surface to be treated, and means for feeding a cold gas flow to the feed line means comprising a compressed gas line, and a vortex tube mounted on said body, said vortex tube having an outlet opening communicating with said feed line means, and having an inlet end connected to said compressed gas line. 2. An apparatus as claimed in claim 1 in which the compressed gas line has an inlet end opposite said vortex tube, and said means for feeding a cold gas flow to the feed line means additionally comprises a water filter and chiller unit in series with the vortex tube at the inlet end of said compressed gas line. 3. An apparatus as claimed in claim 1 in which the means for feeding a cold gas flow feeds a cold gas stream at a temperature of not more than -20° C. to said feed line means. 4. An apparatus as claimed in claim 1 in which the means for feeding a cold gas flow feeds a cold gas stream at a temperature of about -38° C. to said feed line means. 5. An apparatus as claimed in claim 1 in which the means for feeding a cold gas flow feeds a cold gas stream at a temperature of about -50° C. to said feed line means. 6. An apparatus for sanding or polishing a surface comprising: a motor including a body and a working head which is mounted on said body for sanding/polishing movement relative to said body and to the surface to be treated, said working head including means for attachment of an abrasive or polishing material to said working head, feed line means for directing a cold gas flow to the surface to be treated, and means for feeding a cold gas flow to the feed line means comprising a vortex tube adjacent said working head and a compressed gas line, said vortex tube having an outlet opening communicating with said feed line means, and having an inlet end connected to said compressed gas line, the compressed gas line having an inlet end opposite said vortex tube, and said means for feeding a cold gas flow to the feed line means additionally comprising a water filter and chiller unit in series with the vortex tube at the inlet end of said compressed gas line. 7. An apparatus as claimed in claim 6 in which the means for feeding a cold gas flow feeds a cold gas stream at a temperature of not more than -20° C. to said feed line means. 8. An apparatus as claimed in claim 6 in which the means for feeding a cold gas flow feeds a cold gas stream at a temperature of about -38° C. to said feed line means. 9. An apparatus as claimed in claim 6 in which the means for feeding a cold gas flow feeds a cold gas stream at a temperature of about -50° C. to said feed line means.