Load indicator and horizontal lifeline system including the same
A load indicator includes a first connector, a second connector arranged such that pulling the first connector and the second connector in opposite directions applies tension across the load indicator, a fastener structured to attach the first connector to the second connector, a first spring structured to apply bias to the fastener to pull the first and second connectors together, and a moveable member disposed between the first and second connectors and around the fastener. When the tension across the load indicator is at or above a predetermined tension level, the first spring compresses allowing the moveable member to spin freely about the fastener. When the tension across the load indicator is below the predetermined tension level, the first spring pulls the first and second connectors together such that the moveable member cannot spin freely about the fastener.
1. A load indicator comprising:
a first connector;
a second connector arranged such that pulling the first connector and the second connector in opposite directions applies tension across the load indicator;
a fastener structured to attach the first connector to the second connector;
a first spring structured to apply bias to the fastener to pull the first and second connectors together; and
a moveable member disposed between the first and second connectors and around the fastener,
wherein when the tension across the load indicator is at or above a predetermined tension level, the first spring compresses allowing the moveable member to be spun and rotate freely about the fastener,
wherein when the tension across the load indicator is below the predetermined tension level, the first spring pulls the first and second connectors together such that the moveable member cannot spin freely about the fastener, and
wherein the fastener includes a bolt and a nut, wherein the bolt includes a head, wherein the first spring is disposed between the head of the bolt and the first connector, and wherein the first spring is structured to bias the head of the bolt and the first connector in opposite directions to pull the first and second connectors together.
2. The load indicator of claim 1 , further comprising:
a second spring disposed between one of the first and second connectors and the moveable member and being structured to apply bias against the moveable member to press the moveable member against one of the first and second connectors,
wherein when the tension across the load indicator is at or above a predetermined tension level, the first and second connectors are pulled apart such that the second spring cannot bias the moveable member against one of the first and second connectors allowing the moveable member to be spun and rotate freely about the fastener, and
wherein when the tension across the load indicator is below the predetermined tension level, the first and second connectors are close enough together such that the second spring biases the moveable member against one of the first and second connectors such that the moveable member cannot spin freely about the fastener.
3. The load indicator of claim 2 , wherein the first spring is structured to compress a greater distance than the second spring.
4. The load indicator of claim 2 , wherein the second spring is a disc spring disposed about the fastener.
5. The load indicator of claim 1 , wherein the moveable member is a washer disposed about the fastener.
6. The load indicator of claim 1 , wherein the first spring includes a disc spring.
7. The load indicator of claim 1 , wherein the first spring includes a plurality of disc springs.
8. The load indicator of claim 1 , wherein the predetermined tension level is at least about 400 lbs.
9. The load indicator of claim 1 , wherein at least one of the first connector and the second connector is a ring.
10. A horizontal lifeline system comprising:
a first termination arrangement structured to attach to a first anchor point;
a second termination arrangement structured to attach to a second anchor point;
a horizontal lifeline cable coupled to the first termination arrangement;
a load indicator coupled between the first and second termination arrangements, the load indicator comprising:
a first connector;
a second connector arranged such that pulling the first connector and the second connector in opposite directions applies tension across the load indicator;
a fastener structured to attach the first connector to the second connector;
a first spring structured to apply bias to the fastener to pull the first and second connectors together; and
a moveable member disposed between the first and second connectors and around the fastener,
wherein when the tension across the load indicator is at or above a predetermined tension level, the first spring compresses allowing the moveable member to be spun and rotate freely about the fastener,
wherein when the tension across the load indicator is below the predetermined tension level, the first spring pulls the first and second connectors together such that the moveable member cannot spin freely about the fastener,
wherein the tension across the load indicator is substantially the same as tension in the horizontal lifeline cable, and
wherein the fastener includes a bolt and a nut, wherein the bolt includes a head, wherein the first spring is disposed between the head of the bolt and the first connector, and wherein the first spring is structured to bias the head of the bolt and the first connector in opposite directions to pull the first and second connectors together.
11. The horizontal lifeline system of claim 10 , further comprising:
an energy absorber coupled between the first and second termination arrangements and being structured to deploy during a fall; and
a tensioner coupled between the first and second termination arrangements and being structured to adjust tension in the horizontal lifeline cable.
12. The horizontal lifeline system of claim 11 , wherein the first connector is coupled to the energy absorber and the second connector is coupled to the tensioner.
13. The horizontal lifeline system of claim 10 , wherein the load indicator further comprises:
a second spring disposed between one of the first and second connectors and the moveable member and being structured to apply bias against the moveable member to press the moveable member against one of the first and second connectors,
wherein when the tension across the load indicator is at or above a predetermined tension level, the first and second connectors are pulled apart such that the second spring cannot bias the moveable member against one of the first and second connectors allowing the moveable member to be spun and rotate freely about the fastener, and
wherein when the tension across the load indicator is below the predetermined tension level, the first and second connectors are close enough together such that the second spring biases the moveable member against one of the first and second connectors such that the moveable member cannot spin freely about the fastener.
14. The horizontal lifeline system of claim 13 , wherein the first spring is structured to compress a greater distance than the second spring.
15. The horizontal lifeline system of claim 13 , wherein the second spring is a disc spring disposed about the fastener.
16. The horizontal lifeline system of claim 10 , wherein the moveable member is a washer disposed about the fastener.
17. The horizontal lifeline system of claim 10 , wherein the first spring includes at least one disc spring.