In American Football, hitting another player with the top of your helmet used to be called spearing but is now called "targeting with the crown of your helmet".
It is a 15 yard penalty if committed by an offensive player and a 15 yards / automatic 1st down if called against a defensive player. The yards are added to the end of the play if called against a defensive player.
It is illegal to attempt to tackle a ballcarrier by grabbing any part of the helmet. Prior to 2008, an unintentional or "incidental" grab was a 5 yard penalty, and an intentional grab with twisting or pulling was a personal foul 15 yard penalty. As of 2008, all helmet grabs are penalized 15 yards. This penalty is called a facemask.
You cannot tackle another player with your helmet. You can in fact tackle another player leading with your helmet...the rule is that you cannot make helmet to helmet contact with another player. That being said it is unsafe to lead with your helmet in any situation due to injury probability, you risk neck and head injuries when you lead with your helmet.
a lot
a punt may be blocked by the kicking team without penalty unless there is some other illegal act involved. As long as the kicked ball is touched prior to the blocker contacting the punter the contact is ignored. For exanmple If the punt blocker were to block the punt and then make helmet to helmet contact with the punter there would be a penalty for the illegal helmet contact but not the blocking of the punt.
1979.
wear helmet
He had a neck injury at the Seattle Seahawks game. He had helmet to helmet contact.
34 to 100
wear helmet
I do not think so it's only on defenseless players.
All ways wear a helmet
Yes it is now a road rule
the only time a runner can remove his helmet is in the event that the helmet has impaired the runners vision. in that case the umpires would have the decision of the removal being within regulations or not. if it is not then the runner would automatically be out.Another answer: In MLB, there is no rule prohibiting player from removing his helmet. However, rules in other leagues (college, high school, youth, etc.) may have such a rule. Consult your organizations rule book.