Pipe couplings

1. A pipe coupling, comprising:

a first coupling segment defining opposed ends, one end of the first coupling segment defining a first pivotal mount, and another end of the first coupling segment defining a second pivotal mount, wherein the first pivotal mount comprises an upper slot and the second pivotal mount comprises a lower slot;

a second coupling segment defining opposed ends, a proximal end of the second coupling segment configured to pivotally connect to the first pivotal mount, and a distal end of the second coupling segment configured to receive a fastener; and

a third coupling segment defining opposed ends, a proximal end of the third coupling segment configured to pivotally connect to the second pivotal mount, and a distal end of the third coupling segment configured to receive the fastener;

wherein the upper slot is an upper arcuate slot formed into an arcuate rail member, and wherein the lower slot is a lower arcuate slot formed into the arcuate rail member.

2. The pipe coupling of claim 1 :

wherein the distal end of the second coupling segment defines a first fastener pad defining a first fastener hole and the distal end of the third coupling segment defines a second fastener pad defining a second fastener hole; and

further comprising the fastener extending through the first fastener hole and the second fastener hole when the pipe coupling assumes a closed position.

3. The pipe coupling of claim 1 , wherein at least one of the first coupling segment, the second coupling segment, and the third coupling segment further defines a cross-sectional shape defining a pair of rims and a gasket channel segment formed between the pair of rims, one rim in the pair of rims configured to engage a first connection groove formed into a first pipe segment, and another rim in the pair of rims configured to engage a second connection groove in a second pipe segment.

4. The pipe coupling of claim 3 , wherein the first coupling segment, the second coupling segment, and the third coupling segment each define a pair of rims and a gasket channel segment, and each of the gasket channel segments are configured to align with one another to form a gasket channel.

5. The pipe coupling of claim 4 , further comprising a gasket, the gasket configured to be receivable within the gasket channel.

6. The pipe coupling of claim 5 , wherein the gasket defines a mushroom-shaped cross section.

7. The pipe coupling of claim 1 , further comprising:

a first connection member extending from the proximal end of the second coupling segment, the first connection member circumferentially overlapping with the first pivotal mount of the first coupling segment; and

a second connection member extending from the proximal end of the third coupling segment, the second connection member circumferentially overlapping with the second pivotal mount of the first coupling segment.

8. The pipe coupling of claim 7 ,

wherein the first connection member comprises a first pair of bearing blocks protruding from a first exterior surface of the second coupling segment proximate the proximal end of the first coupling segment, and

wherein the second connection member comprises a second pair of bearing blocks protruding from a second exterior surface of the third coupling segment proximate the proximal end of the third coupling segment.

9. The pipe coupling of claim 8 , wherein the arcuate rail member defines a third exterior surface and a support block extending radially outwardly from the third exterior surface, the support block supporting an upper rail and a lower rail, wherein the arcuate rail member is configured to permit arcuate movement of the second coupling segment along the upper rail, and configured to permit arcuate movement of the third coupling segment along the lower rail.

10. The pipe coupling of claim 9 ,

wherein the arcuate rail member defines a rail member cross-section, the rail member cross-section defining a first leg terminating in a first end configured to engage a first connection groove of a first pipe element;

wherein the rail member cross-section further defines a second leg terminating in a second end configured to engage a second connection groove of a second pipe element; and

wherein the rail member cross-section is configured to straddle a gasket cross-section when the pipe coupling is in an assembled state.

11. The pipe coupling of claim 8 ,

wherein the first pair of bearing blocks supports a first guide pin extending through the upper arcuate slot, and

wherein the second pair of bearing blocks supports a second guide pin extending through the lower arcuate slot.

12. The pipe coupling of claim 8 , wherein the arcuate rail member defines an inner surface, and further comprising a gasket seated within the inner surface, the gasket configured to be positioned within a gap between opposing ends of pipe elements when the pipe elements are inserted into the pipe coupling.