Shim lock/pin anti-rotation bumper design

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a synchronizing ring;
• a bumper joined to said synchronizing ring;
• a shim for defining a gap between a bumper pad and said bumper;
• means for fully trapping the shim;
• said shim having a slot with a width;
• and
• said means for fully trapping the shim comprising a shim-lockable sleeve having a diameter greater than the width of said slot.

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a synchronizing ring;
• a bumper joined to said synchronizing ring;
• a shim for defining a gap between a bumper pad and said bumper;
• means for fully trapping the shim;
• means for preventing rotation of said bumper relative to said synchronizing ring;
• and
• said rotation preventing means comprising a first hole in said synchronizing ring, a second hole in said bumper, and a dowel pin fitting in said first and second holes.

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a synchronizing ring;
• a bumper joined to said synchronizing ring;
• a shim for defining a gap between a bumper pad and said bumper;
• means for fully trapping the shim;
• said synchronizing ring having a through bore, said shim having an engagement bore, said bumper having a receiving bore, and said means for fully trapping the shim comprising a pin which passes through said through bore and said engagement bore and is received in said receiving bore.

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a synchronizing ring;
• a bumper joined to said synchronizing ring;
• a shim for defining a gap between a bumper pad and said bumper;
• means for fully trapping the shim;
• said shim having a slot with side walls and said means for fully trapping the shim comprising a fastener having a shoulder for engaging said slot side walls.

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a synchronizing ring;
• a bumper joined to said synchronizing ring;
• means for preventing rotation of said bumper relative to said synchronizing ring;
• and
• said rotation preventing means comprising a first hole in said synchronizing ring, a second hole in said bumper, and a dowel pin inserted into said first and second holes.

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a one-piece composite bumper;
• at least one shim for defining a gap between a bumper pad and said bumper;
• and
• means for fully trapping the at least one shim.

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a one-piece composite bumper;
• at least one shim for defining a gap between a bumper pad and said bumper;
• means for fully trapping the at least one shim;
• and
• said trapping means comprising a shim-lockable sleeve, a fastener passing through said bumper and said sleeve, and a collar for engaging and locking said fastener.

A bumper system for use with a compressor variable vane system, said bumper system comprising:

• a one-piece composite bumper;
• at least one shim for defining a gap between a bumper pad and said bumper;
• means for fully trapping the at least one shim;
• and
• each said shim having a slot with side walls and said trapping means comprising a fastener having a shoulder for engaging said side walls.