Gavels are not legally necessary. For those courts and judges who stiill use them, it is usually used to emphasize a point - much like ending a phrase or sentence with a period at the end. These days (in the US) the use of a gavel is dying out and/or falling out of favor.
ANSWER:
Judges do not "hit the gavel." They hit the little round wooden sounding block WITH the gavel.
a judge's gavel strikes a sound block.
see this usage in the industry
e.g.
http://www.memorablegifts.com/productcart/pc/viewPrd.asp?idcategory=19&idproduct=1572
A "Sound block"
sound block
The small mallet used by the judge is called a gavel.
A gavel is a mallet, as used by a judge or an auctioneer.
A gavel is a mallet, as used by a judge or an auctioneer.
It's a Gavel. (rhymes with gravel)
a gavel
A judge typically carries a gavel, which is a small wooden hammer used to signal the start or end of a session or to punctuate a decision or order.
The judge banged the gavel, calling the courtroom to order.
The wooden pad under a gavel is called the "Sound Block" or the "Base" of the gavel.
Gavel
The wooden "hammer" looking object the judge bangs to get order is called a gavel.
The mallet is a gavel and he hits it against a block of wood called a sound block.
The possessive form of the noun judge is judge's.Example: The sound of the judge's gavel is still ringing in my ears.