I have a home project that involves lifting a platform with a cable that runs through a series of pulleys to redirect the cable.
I'm selecting pulleys for the job and I see that some pulleys are rated for horizontal pulling while others are rated for lifting. This would make sense to me if they were fixed pulleys since it might imply the direction of force that the pulleys are suitable for, but that doesn't seem to be the case since I see free hanging pulleys that are marketed for horizontal pulling and lifting separately.
- For Vertical Pulling (https://www.mcmaster.com/3099T14)
- For Horizontal pulling (https://www.mcmaster.com/3170T27)
- Full catalog with more examples (https://www.mcmaster.com/catalog/126/1614)
What makes a pulley appropriate for horizontal pulling versus lifting?