Buy the 2015 Old Farmer's Almanac!
Reporting
A couple of things my beA couple of things my be going on here: You may have over fertilized, esp with nitrogen, which aids in rapid growth. A too-rich compost/manure can also bring about this situation. High temps, including at night, and low humidity or uneven/inconsistent moisture may have caused the beans to not set pods. Also, your beans need 8 to 10 hours of sunlight. We hope this helps.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?