Open Question: Accident at work, worker's comp claim. OSHA involvement?

There's a situation at my work where large animals + certain equipment = injured employees. Suffice to say with a bit more design savvy, the equipment could be modified to eliminate or at least reduce these types of injures. I have suggested this to my employer when I returned to work after a month off. My injury was in December. To date, nothing has been addressed. Tell me: When does OSHA get involved with injuries that occur at work? Are they notified simply because a worker's comp claim has been initiated? Does the injured worker have to give a heads up in order to get OSHA involved? I'm reluctant to blow the whistle myself, but unfortunately the employer is not addressing this, and I fear someone will get seriously injured or killed one day.