Counterbalance for a platform balance

A platform balance comprising:

• a first frame support;
• a second frame support, the first frame support and the second frame support being movable relative to each other;
• and
• at least one counter balance assembly coupling the first and second frame supports, the at least one counter balance assembly comprising:
• a beam;
• a cross flexure pivot assembly supported by the second frame assembly and allowing the beam to pivot;
• a weight selectively positionable along a length of the beam;
• and
• a planar motion assembly coupled to the beam wherein the planar motion assembly supports the first frame support.

A platform balance comprising:

• a first frame support;
• a second frame support, the first frame support movable relative to the second frame support;
• and
• at least one counter balance assembly comprising:
• a beam;
• a first pivot assembly supported by the second frame support and allowing the beam to pivot;
• a weight selectively positionable on the beam;
• and
• a compliant assembly supported by the beam on a portion thereof on a side of the first pivot assembly opposite the weight, the compliant assembly supporting the first frame support, the compliant assembly comprising:
• a cross flexure assembly comprising:
• a first support member;
• a second support member;
• an intermediate member;
• a first pair of flexible plates joining the first support member to the intermediate member, the first pair flexible plates being configured orthogonal to each other to allow pivoting motion of the first support member relative to the second support member about a first axis;
• and
• a second pair of flexible plates joining the second support member to the intermediate member, the second pair flexible plates being configured orthogonal to each other to allow pivoting motion of the first support member relative to the second support member about a second axis orthogonal to the first axis;
• and
• a planar motion assembly coupled to the compliant assembly.

A platform balance comprising:

• a first frame support;
• a second frame support, the first frame support and the second frame support being movable relative to each other;
• and
• at least one counter balance assembly coupling the first and second frame supports, the at least one counter balance assembly comprising:
• a beam;
• a cross flexure pivot assembly supported by the second frame assembly and allowing the beam to pivot, the cross flexure pivot assembly comprising two spaced-apart sets of orthogonal arranged flexible plates wherein one set of the flexible plates is parallel to a longitudinal axis of the beam;
• a weight selectively positionable along a length of the beam;
• and
• a planar motion assembly coupled to the beam wherein the planar motion assembly supports the first frame support.