Straight line abrading tool

A portable abrading tool, comprising:

• a cylinder body adapted to be held and manipulated by a user and containing a cylinder bore closed at its opposite ends;
• a piston mounted in said bore for reciprocation relative thereto along a predetermined axis, said piston having two piston heads reciprocable within opposite ends of said bore and having a reduced portion extending axially between said interconnecting said piston heads;
• valve means for admitting pressure fluid to opposite ends of said bore in a relation causing powered reciprocation of the piston relative to said cylinder body;
• two racks carried at opposite sides of said reduced portion of the piston for reciprocation with the piston along said axis, said two racks facing transversely of said axis in two essentially opposite transverse directions respectively and away from one another;
• two gear units mounted to said body at opposite sides of said reduced portion of the piston for rotation relative to the body about two parallel vertical axes lying in essentially a common vertical plane disposed transversely of said first mentioned axis, said two gear units having gear teeth meshing with said two oppositely facing racks respectively in a relation transmitting transverse forces from said racks through said gear units to the body in said two opposite directions, and turning the gear units simultaneously in opposite directions upon axial movement of the piston;
• a shoe mounted at the underside of said body for reciprocation relative to the body and parallel to said first mentioned axis to abrade a work surface;
• and
• two additional racks attached to said shoe and facing transversely of said first mentioned axis and inwardly toward one another;
• said two gear units having teeth at their lower ends engaging and meshing with said two additional racks respectively in a relation reciprocating said shoe relative to said body but oppositely from said piston.

A portable abrading tool comprising:

• a cylinder body adapted to be held and manipulated by a user;
• a piston structure mounted in said body for reciprocation relative thereto along a predetermined axis;
• valve means for admitting pressure fluid to said cylinder body in a relation causing reciprocation of the piston structure;
• two gear units mounted for rotation relative to said body;
• means for oscillating said two gear units rotatively relative to and in response to reciprocation of said piston structure;
• a shoe mounted for reciprocation relative to said body and parallel to said axis to abrade a work surface;
• and
• two racks attached to said shoe for reciprocation therewith along said axis, said two racks both facing essentially transversely of said axis and facing in two essentially opposite transverse directions respectively and engaging gear teeth on said two gear units respectively in a relation transmitting transverse forces from the two gear units to the two racks and attached shoe in opposite directions while causing reciprocation of the shoe relative to the body but oppositely from the piston structure.

A portable abrading tool comprising:

• a body adapted to be held and be manipulated by a user;
• a shoe mounted to the underside of said body;
• powered means for reciprocating said shoe relative to said body along a predetermined axis to abrade a work surface;
• an aspirator carried by said body and to which a primary stream of pressure fluid is delivered;
• and
• means forming a path along which a secondary stream of pressure fluid flows from a location near said work surface and through said shoe to said aspirator to draw abraded particles by aspirator action from near the work surface;
• said last mentioned means including two conduits connected to said body and said shoe respectively and extending essentially parallel to said axis and received in interfitting telescoping relation enabling axial movement of one of said conduits with the shoe relative to the other conduit and said body for confined flow of said secondary stream through the conduits while the shoe reciprocates.

A portable abrading tool comprising:

• a body adapted to be held and be manipulated by a user and containing a cylinder bore;
• a piston structure mounted in said cylinder bore for reciprocation relative thereto along a predetermined axis;
• and
• a shoe reciprocable relative to said body by said piston structure to abrade a work surface;
• said body having an end wall structure extending across an end of said bore, said end wall structure including means forming an aspirator axially opposite said end of the bore and energized by a flow of air exhausted from said bore to induce a secondary flow of air and abraded particles from a location near said shoe.

A portable abrading tool comprising:

• a body adapted to be held and be manipulated by a user and containing a cylinder bore;
• a piston structure mounted in said cylinder bore for reciprocation relative thereto along a predetermined axis;
• and
• a shoe reciprocable relative to said body by said piston structure to abrade a work surface;
• said body having an end wall structure extending across an end of said bore and forming an aspirator energized by a flow of air exhausted from said bore to induce a secondary flow of air and abraded particles from a location near said shoe;
• said end wall structure including a first plate disposed across said end of said bore and containing an outlet passage through which said secondary flow of air discharges, and a second plate extending across an inner side of said first plate and emitting said flow of air exhausted from the bore into said passage in the first plate.

A portable abrading tool comprising:

• a body adapted to be held and be manipulated by a user and containing a cylinder bore;
• a piston structure mounted in said cylinder bore for reciprocation relative thereto along a predetermined axis;
• and
• a shoe reciprocable relative to said body by said piston structure to abrade a work surface;
• said body having an end wall structure extending across an end of said bore and forming an aspirator energized by a flow of air exhausted from said bore to induce a secondary flow of air and abraded particles from a location near said shoe;
• said end wall structure including three plates extending across said end of said bore generally parallel to one another and passaged to form said aspirator;
• there being a tube carried by a central one of said plates and extending generally parallel to said axis, and a second tube connected to said shoe to receive air and abraded particles therefrom and telescipically interfitting with said first tube to conduct said air and particles thereto.

A portable abrading tool comprising:

• a body adapted to be held and be manipulated by a user and containing a cylinder bore;
• a piston structure mounted in said cylinder bore for reciprocation relative thereto along a predetermined axis;
• a shoe reciprocable relative to said body by said piston structure to abrade a work surface;
• said body having an end wall structure extending across an end of said bore and forming an aspirator energized by a flow of air exhausted from said bore to induce a secondary flow of air and abraded particles from a location near said shoe;
• said end wall structure including a first plate disposed across said end of said bore and having a generally tubular portion containing a discharge passage through which said secondary flow of air and particles discharge, a second plate extending across said end of said bore at an inner side of said first plate and carrying a nozzle emitting said exhaust air from said bore into said discharge passage, a first tube connected to said second plate and projecting therefrom generally parallel to said axis and through which said secondary flow of air passes, said first plate containing a recess opposite said second plate defining a passage leading said secondary flow of air from said first tube to said discharge passage and to the location of said nozzle, and a third plate extending across said end of said bore at an inner side of said second plate and containing an opening through which said exhaust air from said bore passes, there being a recess in said second plate at a location opposite said third plate and forming a passage leading said exhaust air to said nozzle;
• and
• a second tube connected to said shoe and telescopically interfitting with said first tube and conducting said secondary flow of air and particules thereto.