Apparatus for grinding and lapping annular sealing faces

Abstract

In an apparatus for grinding and lapping annular sealing faces (25) in valves, slides and the like, a driven tool plate (4) carries freely rotable grinding and lapping heads (21) of which the axes are parallel to the rotary axis of the tool plate (4). In an eccentric bearing hole (15) of the tool plate (4), there is a circular bearing plate (10) which is rotable relatively to the tool plate (4) and can be securely connected in the desired rotary position to the tool plate (4). A drive pin (5) is eccentrically connected to the bearing plate (10) for rotation therewith (FIG. 3).

I claim: 
     
       1. Apparatus for grinding and lapping annular sealing faces in valves, slides and the like, comprising a mounting securable to the workpiece and having on one side a drive and on the other side a rotable tool plate which is coupled to the drive by a tranmission element and carries a series of freely rotatable grinding or lapping heads with axes parallel to the tool plate axis, the heads being radially adjustable relatively to the tool plate, the tool plate (4) has a bearing hole (15) which is offset from its mid-point and in which a circular bearing plate (10) is adjustably mounted, a drive pin (5) which is coupled to the transmission element being secured off-centre to the bearing plate for rotation therewith. 
     
     
       2. Apparatus according to claim 1, wherein the eccentricity of the bearing hole (15) relatively to the centre of the tool plate (4) is equal to the eccentricity of the point of engagement of the drive pin (5) on the bearing plate (10) in relation to this plate. 
     
     
       3. Apparatus according to claim 1 or claim 2, wherein the bearing hole (5) defines a shoulder (13) abutted by a counter-shoulder of the bearing plate (10). 
     
     
       4. Apparatus according to claim 1 wherein the bearing plate (10) is screw-connected to the tool plate (4). 
     
     
       5. Apparatus according to claim 1 or 2 wherein the bearing plate is screw-connected to the tool plate. .Iadd. 
     
     
       6.  Apparatus for grinding and lapping annular sealing faces in valves, slides and the like, said apparatus comprising: a mounting structure securable to a workpiece;   drive mechanism including a rotary drive pin carried by the structure;   a rotatable tool plate carried by the structure;   a series of freely rotatably grinding or lapping heads carried by said tool plate with their axes of rotation parallel to the axis of rotation of the plate, said heads being radially shiftable relative to the plate;   said plate having a bearing hole therein;   a circular bearing plate rotatably mounted in said bearing hole;   a joint interconnecting said drive pin and said bearing plate for rotation of the plate with the pin;   the point of connection between said drive pin and said plate being offset relative to the center of the bearing plate. .Iaddend. .Iadd.7. Apparatus as set forth in claim 6 wherein said bearing hole is offset from the axis of rotation of the tool plate. .Iaddend. .Iadd.8. Apparatus as set forth in claim 7 wherein the offset of the bearing hole relative to the mid-point of the tool plate is equal to the offset of the said point of connection relative to the center of the bearing plate. .Iaddend. .Iadd.9. Apparatus as set forth in claim 6 wherein said joint comprises a universal   
     
     
        joint. .Iaddend. .Iadd.10.  Apparatus as set forth in claim 9 wherein said joint comprises interengaged ball and socket elements. .Iaddend. .Iadd.11. Apparatus for grinding and lapping annular sealing faces in valves, slides and the like, said apparatus comprising: means for mounting the apparatus on a workpiece;   a drive mechanism including a rotatable drive pin;   a tool plate mounted for rotation about an axis which extends through the plane of the plate, said plate having a bearing hole therein which is offset from said axis;   a series of freely rotatably grinding or lapping heads mounted on the plate for rotation about individual axes which are esentially perpendicular to the plane of the plate;   a bearing plate adjustably mounted in said hole and securable thereto for rotation together with the tool plate about said axis; and   means operably connecting the drive pin and the bearing plate for rotation together, the point of connection on the bearing plate being offset relative to the center of the hole. .Iaddend. .Iadd.12. Apparatus as set forth in claim 11 wherein said bearing hole and said bearing plate are circular, said plate being mounted for rotation in said hole for accomplishing said adjustment. .Iaddend. .Iadd.13. Apparatus as set forth in claim 10 wherein said means for connecting the transmission element and   
     
     
        the bearing plate comprises a universal joint. .Iaddend. .Iadd.14. Apparatus as set forth in claim 13 wherein said bearing hole and said bearing plate are circular, said plate being mounted for rotation in said hole for accomplishing said adjustment. .Iaddend. .Iadd.15. Apparatus as set forth in claim 13 wherein said universal joint comprises interengaged ball and socket elements. .Iaddend. .Iadd.16. Apparatus for grinding and lapping annular sealing faces in valves, slides and the like, said apparatus comprising: a mounting structure securable to a workpiece;   drive mechanism including a rotary drive pin carried by the structure;   a rotatable tool plate carried by the structure;   a series of freely rotatably grinding or lapping heads carried by said tool plate with their axes of rotation parallel to the axis of rotation of the plate;   said plate having a bearing hole therein, said hole being offset from the axis of rotation of the plate;   a circular bearing plate rotatably mounted in said bearing hole;   a joint interconnecting said drive pin and said bearing plate for rotation of the plate with the pin;   the point of connection between said drive pin and said plate being offset relative to the center of the bearing plate. .Iaddend.