A drive coupling has first and second coaxial end adapters. A first set of at least two coaxial helical elements has a first end of each element attached to the first end adapter, and a second end of each element is coupled to the second end adapter. At least one biasing device biases the end adapte
A drive coupling has first and second coaxial end adapters. A first set of at least two coaxial helical elements has a first end of each element attached to the first end adapter, and a second end of each element is coupled to the second end adapter. At least one biasing device biases the end adapters relative to each other. Torque applied to one of the end adapters is transferred through the first set of helical elements to the other end adapter, the helical elements allowing for misalignment of the end adapters during operation.
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1. A drive coupling, comprising: first and second coaxial end adapters;a first set of at least two coaxial helical elements, a first end of each element being attached to the first end adapter, a second end of each element being coupled to the second end adapter;elastomeric material located between
1. A drive coupling, comprising: first and second coaxial end adapters;a first set of at least two coaxial helical elements, a first end of each element being attached to the first end adapter, a second end of each element being coupled to the second end adapter;elastomeric material located between at least some of the helical elements; andat least one biasing device for biasing the end adapters relative to each other;wherein torque applied to one of the end adapters is transferred through the first set of helical elements to the other end adapter, the helical elements allowing for misalignment of the end adapters during operation. 2. The drive coupling of claim 1, wherein the helical elements are formed from metal or fiber-reinforced composite. 3. The drive coupling of claim 1, further comprising: fault-indicating material associated with the helical elements, the fault-indicating material producing visible indicia after the coupling is operated with one or more failed helical elements. 4. The drive coupling of claim 1, further comprising: fault-indicating material associated with the helical elements, the fault-indicating material producing an audible sound during operation of the coupling with one or more failed helical elements. 5. The drive coupling of claim 1, further comprising: a drive shaft;a second set of at least two helical elements, a first end of each element being attached to the second end adapter, a second end of each element of the second set being attached to a first end of the drive shaft;wherein the second end of each element of the first set is attached to a second end of the drive shaft, thereby coupling the elements of the first set to the second end adapter. 6. The drive coupling of claim 5, further comprising: a spindle extending from at least one end adapter and configured to engage the drive shaft for limiting misalignment of the associated end adapter relative to the drive shaft. 7. The drive coupling of claim 5, further comprising: a bearing mounted in one end of the drive shaft;a spindle extending from one of the end adapters and configured to engage the bearing of the drive shaft for limiting misalignment of the associated end adapter relative to the drive shaft. 8. The drive coupling of claim 1, wherein the helical elements are intermeshed. 9. A drive coupling, comprising: a drive shaft having first and second ends;first and second coaxial end adapters;a first set of at least two coaxial helical elements, a first end of each element of the first set being attached to the first end adapter, a second end of each element of the first set being attached to the first end of the drive shaft;a second set of at least two coaxial helical elements, a first end of each element of the second set being attached to the second end adapter, a second end of each element of the second set being attached to the second end of the drive shaft;elastomeric material located between at least some of the helical elements; andat least one biasing device for biasing one of the end adapters relative to the associated end of the drive shaft;wherein torque applied to one of the end adapters is transferred through the associated set of elements, through the drive shaft, and then through the other set of helical elements to the other end adapter, the helical elements allowing for misalignment of the end adapters relative to each other and to the drive shaft during operation. 10. The drive coupling of claim 9, wherein the helical elements are formed from metal or fiber-reinforced composite. 11. The drive coupling of claim 9, further comprising: fault-indicating material associated with the helical elements, the fault-indicating material producing visible indicia after the coupling is operated with one or more failed helical elements. 12. The drive coupling of claim 9, further comprising: fault-indicating material associated with the helical elements, the fault-indicating material producing an audible sound during operation of the coupling with one or more failed helical elements. 13. The drive coupling of claim 9, further comprising: a spindle extending from at least one end adapter and configured to engage the drive shaft for limiting misalignment of the associated end adapter relative to the drive shaft. 14. The drive coupling of claim 9, further comprising: a bearing mounted in one end of the drive shaft;a spindle extending from one of the end adapters and configured to engage the bearing of the drive shaft for limiting misalignment of the associated end adapter relative to the drive shaft. 15. The drive coupling of claim 9, wherein the helical elements are intermeshed. 16. A drive coupling, comprising: a drive shaft having first and second ends;first and second coaxial end adapters;a first set of at least two coaxial helical elements, a first end of each element of the first set being attached to the first end adapter, a second end of each element of the first set being attached to the first end of the drive shaft;a second set of at least two coaxial helical elements, a first end of each element of the second set being attached to the second end adapter, a second end of each element of the second set being attached to the second end of the drive shaft;elastomeric material located between at least some of the helical elements;a bearing mounted in one end of the drive shaft; anda spindle extending from one of the end adapters and configured to engage the bearing of the drive shaft for limiting misalignment of the associated end adapter relative to the drive shaft;wherein torque applied to one of the end adapters is transferred through the associated set of elements, through the drive shaft, and then through the other set of helical elements to the other end adapter, the helical elements allowing for misalignment of the end adapters relative to each other and to the drive shaft during operation. 17. The drive coupling of claim 16, further comprising: at least one biasing device for biasing one of the end adapters relative to the associated end of the drive shaft.
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