Shock absorber and metal cover

A shock absorber for connecting a vibration member as a vibration source and a covering member for covering the vibration member to absorb vibration from the vibration member to the covering member, the shock absorber comprising:

• a collar including a substantially tubular collar shaft to be fastened to the vibration member with a fastener, and annular flanges protruding radially outward from two axial ends of the collar shaft;
• an annular fixing member fixable to the covering member;
• an annular shock absorbing member located between the collar and the fixing member with a radially outer peripheral portion of the shock absorbing member fixed to the fixing member, the shock absorbing member comprising a shock absorbing material;
• and
• a spring located between at least one of the flanges on the collar and the shock absorbing member, and overlaid on the shock absorbing member,
• wherein the shock absorbing member includes a radially inner peripheral portion loosely fitted on the collar shaft at least in a radial direction;
• the spring has a spring constant equal to or smaller than a spring constant of the shock absorbing member, and is substantially truncated in a side view which has a larger diameter in a portion nearer the shock absorbing member than in a portion nearer the at least one of the flanges, and is spiral in a plan view;
• the radially inner peripheral portion of the shock absorbing member is thicker than the radially outer peripheral portion fixed to the fixing member,
• the shock absorbing member includes a movement restrictor in contact with the spring to restrict radial movement of the spring relative to the shock absorbing member,
• the movement restrictor located between the radially inner peripheral portion and the radially outer peripheral portion, and is adjacent to the spring on the shock absorbing member;
• the movement restrictor includes a movement restriction ridge protruding to outwardly more than the radially inner peripheral portion, and
• extends along and is in contact with the radially outer portion that is radially outward in the spring spiral in a plan view
• the spring has a radially outer portion in contact with 40% to 55% of a circumference of the movement restrictor.