Patent ID: 7440038
Filing Date: 2008-10-21
Classification: F16M,H04N,Y10S

Abstract:
1. A liquid crystal television comprising: a main body capable of swiveling around a vertically extending rotation axis, and comprising: a resin cabinet; and a liquid crystal display surface for presenting images thereon; and a stand comprising: a metal bottom plate member disposed at the bottom of the stand, and comprising: a plurality of first countersunk holes for inserting a plurality of first screws, and a plurality of second countersunk holes for inserting a plurality of second screws, the first and second countersunk holes being formed by initially punching out a plurality of through-holes in a metal sheet, and then forming countersinks at respective open ends of the through-holes which are open in a surface of the metal sheet to be a lower surface of the bottom plate member, by plastic deformation of the metal sheet by pressing; and a plurality of accommodating holes which are formed around each of the through-holes, by punching concurrently with the punching out of the through-holes, so as to accommodate the material forming the metal sheet which is flowed upon the formation of the countersinks, in order to prevent the material from rising around the through-hole; an upper cover formed of a resin, and having in its lower surface a plurality of first screw holes comprising a first group formed at respective positions corresponding to the first countersunk holes, and a second group formed at respective positions corresponding to the second countersunk holes, so that the upper cover is secured to the bottom plate member by inserting the first screws into the first countersunk holes and the first screw holes of the first group while each of the first countersunk holes is aligned with a corresponding one of the first screw holes of the first group and tightening the first screws, and inserting the second screws into the second countersunk holes and the first screw holes of the second group while each of the second countersunk holes is aligned with a corresponding one of the first screw holes of the second group and tightening the second screws; an annular guide member formed of a resin, comprising: an upper extending portion protruding from an upper surface of the guide member along the entire circumference at a radial position outward of an inner circumferential surface of the guide member and inward of an outer circumferential surface of the guide member; a lower extending portion protruding from a lower surface of the guide member along the entire circumference at a radial position outward of an inner circumferential surface of the guide member and inward of an outer circumferential surface of the guide member; an upper contact portion upward protruding intermittently along the entire circumference from the upper surface of the guide member at a radial position between the inner circumferential surface of the guide member and an inner circumferential surface of the upper extending portion; a lower contact portion downward protruding along the entire circumference from the lower surface of the guide member at a radial position between the inner circumferential surface of the guide member and an inner circumferential surface of the lower extending portion; and a plurality of second screw holes formed through the guide member at respective positions which are located radially outward of an outer circumferential surface of the upper extending portion and an outer circumferential surface of the lower extending portion, to be aligned with the first countersunk holes and the first screw holes of the first group, so that the guide member is fixed in a horizontal position between the bottom plate member and the upper cover and centered on the rotation axis, by the inserting the first screws into the first countersunk holes and the first screw holes of the first group and tightening the first screws; a metal support unit which is supported to be rotatable with respect to and along the guide member, and supports the main body such that the main body is capable of swiveling with respect to the stand and around the rotation axis, the metal support unit comprising: a metal upper disk member which has a diameter larger than that of the inner circumferential surface of the guide member and smaller than that of the inner circumferential surface of the upper extending portion, and a lower surface of the upper metal disk contacting an upper end of the upper contact portion; a metal lower disk member which is fixed at its portion located radially inward of the inner circumferential surface of the guide member to the lower surface of the upper disk member, and has a diameter larger than that of the inner circumferential surface of the guide member and smaller than the inner circumferential surface of the lower extending portion, at least a radial part of the lower disk member between the inner circumferential surface of the guide member and the inner circumferential surface of the lower extending portion being located under the guide member, so that the lower disk member contacts a lower end of the lower contact portion; and a metal support member fixed to an upper surface of the upper disk member so as to support the main body such that the upper and lower disk members sandwiching a radial part of the guide member which is inward of the inner circumferential surface of the upper extending portion and the inner circumferential surface of the lower extending portion, and that the metal support member is rotatable with respect to and along the guide member; and the positions of a plurality of combinations each consisting of one of the first countersunk holes and a corresponding one of the first screw holes of the first group, being symmetric with respect to the center point of the guide member.