Backup pad for abrasive articles

A quick release system for releasably attaching a backup pad on a mounting shaft, comprising:

• a) a backup pad including:
• i) a body comprising a front surface and a back surface;
• ii) releasable engagement means provided on said front surface for releasably engaging an abrasive article;
• and
• iii) a mounting boss provided on said rear surface, wherein said mounting boss includes a first end facing away from said body, an opening in said first end of said boss, said opening being formed by an inner surface generally perpendicular to said body and defining a first portion having a non-circular cross section, said opening including a circular groove between said first portion and said body;
• wherein said backup pad further includes an elastic ring retained in said circular groove for releasably retaining said mounting shaft in said opening;
• and
• b) a mounting shaft comprising a first end and a second end, said first end including a groove for engagement with said elastic means, said mounting shaft including a mating portion defining a cross section corresponding to said opening cross section in said boss.

A backup pad for releasably engaging an abrasive article, the backup pad comprising:

• a resilient pad comprising a front surface and a back surface;
• releasable engagement means provided on said front surface of said resilient pad for releasably engaging an abrasive article, and a backing plate on said rear surface of said resilient pad;
• and
• a mounting boss extending from said backing plate;
• wherein said mounting boss includes a first end facing away from said resilient pad, an opening in said first end of said boss, said opening being formed by an inner surface generally perpendicular to said body and defining a non-circular cross section, said opening including elastic means for releasably engaging a drive shaft mounted in said opening.

A quick release system for releasably attaching a backup pad on a mounting shaft, comprising:

• a) a backup pad including:
• i) a resilient pad comprising a front surface and a back surface;
• ii) releasable engagement means provided on said front surface of said resilient pad for releasably engaging an abrasive article, and a backing plate provided on said rear surface of said resilient pad;
• and
• iii) A mounting boss provided extending from said backing plate, wherein said mounting boss includes a first end facing away from said resilient pad, an opening in said first end of said boss, said opening being formed by an inner surface generally perpendicular to said body and defining a non-circular cross section, said opening including elastic means for releasably retaining said mounting shaft in said opening;
• and
• b) a mounting shaft comprising a first end and a second end, said first end including a groove for engagement with said elastic means, said mounting shaft including a mating portion defining a cross section corresponding to said opening cross section in said boss.