Patent ID: 8398275

Claim:
A lamp head assembly, comprising: an outer head unit including an outer head body, a first retaining structure disposed on the inner surface of the outer head body, a first sliding structure disposed on the inner surface of the outer head body, at least two conductive pins passing through one side of the outer head body and combined with the outer head body, and at least one button opening passing through the outer head body, wherein the outer head body has a receiving groove; an elastic pressing unit disposed movably in the receiving groove of the outer head body, wherein the elastic pressing unit includes a second retaining structure mated with the first retaining structure, an elastic element extended downwardly from the second retaining structure, a pressing element extended downwardly from the elastic element and passing through the button opening, and a first positioning element extended outwardly from a lateral side of the pressing element; and an inner head unit disposed rotatably in the receiving groove of the outer head body, wherein the inner head unit includes a hollow inner head body, a second sliding structure disposed on the outer surface of the inner head body and mated with the first sliding structure, and a plurality of second positioning elements disposed on the inner surface of the inner head body, and the first positioning element is selectively mated with one of the second positioning elements.