Wow!! There is absolutely NO bylaws or rules within a school that says you have to tolerate being attacked! If they do not do anything, then maybe you need to look into legal options regarding the school you work at and the district.

Remind your administrators about OSHA rules.  You have the right to a safe workplace.  In camps, daycare, and schools if a child bites or draws blood, there is a process to assure you and the child that you are not subject to HIV. I would also send him to the nurse every time he is out of control and ask that he be picked up.  the parent will soon get the message that this child needs evaluation by his pediatrician and the schools guidance support staff.

Wayne Yankus, MD, FAAP
expert panelist: pediatrics

My answer is not really an answer but a request.  I desire that you pursue a lawsuit against the parents.  Why should a parent have the right to sue you if you hit the child, but you have no right to sue the parent over their inability to raise a controllable child?  While your legal counsel will want to pursue your employer as well, they are only liable in that they do not give you a safe workplace.  This will take much more documentation I am sorry to say in my feeble opinion.  However, the child has already hurt you and other children as well.  We, as teachers, need to set a precedent, legally, that this sort of action is not allowable.  There will obviously be scoffers of suing the parent out there in "internet land," but if every teacher who gets hit by a student sues the parent of the child, the teachers will get the same laws and rights as the parents have for us hitting their child.  Who knows, if you win, you might not have to work anymore.