Illumination lamp and rotatable light-emitting module thereof

An illumination lamp includes a mounting frame and at least a rotatable light-emitting module. The at least a rotatable light-emitting module includes at least one bracket with one end securely mounted on the mounting frame, a heat sink being pivotally connected with the other end of the at least one bracket, and a light source mounted on the heat sink.

BACKGROUND

1. Technical Field

The present invention relates generally to an illumination lamp, and more particularly to an illumination lamp having rotatable light-emitting modules so that the direction of light from the illumination lamp can be conveniently adjusted.

2. Description of Related Art

An illumination lamp is widely used in various fields. For example, an illumination lamp has been widely used for illumination purpose. However, the illumination lamp generally cannot be adjusted to change the direction of light from the illumination lamp after assembly. Thus, the illumination lamp sometimes cannot meet the requirement of users.

Therefore, it is desirable to provide an illumination lamp to overcome the above-mentioned shortcoming.

DETAILED DESCRIPTION

Referring toFIG. 1, an illumination lamp10according to an exemplary embodiment of the present invention includes a mounting frame11and three rotatable light-emitting modules12mounted to the mounting frame11. The mounting frame11is equilateral triangle-shaped and includes three mounting arms111connecting with each other. The three rotatable light-emitting modules12are suspended under the three mounting arms111, respectively.

Referring toFIGS. 2-5, the rotatable light-emitting module12includes a light-emitting unit13, two L-shaped brackets19, two poles18, two springs197and two nuts198. The two brackets19are symmetrically disposed at two opposite ends of the light-emitting unit13. The light-emitting unit13is pivotally connected with the two brackets19.

The light-emitting unit13is disposed under the mounting frame11and includes a heat sink14, a light source15, a sealing member16, a transparent cover17and an engaging member174. The heat sink14includes a base plate141and a plurality of fins145formed on the base plate141and facing the mounting frame11. The base plate141has a heat absorbing surface142at a bottom side thereof and a heat dissipating surface143opposite to the heat absorbing surface142. The plurality of fins145extend from the heat dissipating surface143of the heat sink14and are spaced from each other.

The light source15includes a printed circuit board151attached to the heat absorbing surface142of the heat sink14and a plurality of light emitting diodes152(LEDs) disposed on the printed circuit board151and spaced from each other.

The transparent cover17has an engaging flange171extending outwardly from an outer peripheral edge thereof and defines a recess172therein for receiving the light source15. The transparent cover17is disposed on the base plate141, whereby the transparent cover17and the base plate141cooperatively define a receiving chamber for receiving the light source15therein. The sealing member16defines a rectangle-shaped through hole therein. The sealing member16is sandwiched between the transparent cover17and the base plate141for preventing dust and water from entering the receiving chamber in which the light source15is received.

The engaging member174is disposed on the engaging flange171of the transparent cover17. The engaging member174, the transparent cover17and the sealing member16are together fixed on the base plate141of the heat sink14via screws (not labeled).

The bracket19includes a vertical section192and a lateral section193perpendicular to the vertical section192. A free end194of the vertical section192defines a through hole195.

The pole18includes a flat fixing section181, a column-shaped rotating section182and a thread section183. The fixing section181and the thread section183are disposed at two opposite ends of the pole18, and the rotating section182is disposed between the fixing section181and the thread section183. A flange184is formed at a joint between the rotating section182and the fixing section181and has a diameter larger than a diameter of the rotating section182and a width of the fixing section181.

The lateral section193of the bracket19is fixedly mounted on the mounting arm111of the mounting frame11via a screw (not labeled). The thread section183and the rotating section182successively extend through the through hole195of the vertical section192of the bracket19until the flange184resists on the vertical section192of the bracket19. The nut198is engaged with the thread section183of the pole18. The spring197is disposed around the pole18and is compressively sandwiched between the nut198and the vertical section192of the bracket19. Preferably, a gasket199is sandwiched between the spring197and the vertical section192of the bracket19. The fixing section181of the pole18is fixed on the heat dissipating surface143of the heat sink14via a screw (not labeled) and disposed between two adjacent fins145.

The spring197is compressed for providing an axial reactive force on the vertical section192of the bracket19, whereby the vertical section192of the bracket19is firmly attached to the flange184of the pole18and a static friction between the pole18and the bracket19offers resistance to relative motion of the light-emitting unit13to the bracket19and the mounting arm11of the frame10. When an external force exceeding the static friction is applied on the light-emitting unit13, the light-emitting unit13can be rotated relative to the bracket19. Without the external force, the light-emitting unit13remains at a stationary position relative to the bracket19.

Since the light-emitting unit13is pivotally connected with the bracket19, a direction of light from each of the plurality of the light-emitting units13can be independently adjusted so that the lightening direction of the illumination lamp10can be conveniently adjusted. Thus, a distribution of luminous intensity of the illumination lamp10can be conveniently adjusted to satisfy various luminous requirements without reassembling the whole illumination lamp10.

FIG. 6shows an alternative embodiment of the illumination lamp. In this alternative embodiment, the illumination lamp20includes a mounting frame21and a plurality of rotatable light-emitting modules12mounted to the mounting frame21. The mounting frame21includes a bottom wall211and a side wall212extending downwardly from an outer peripheral edge of the bottom wall211. The plurality of rotatable light emitting modules12are evenly mounted on the bottom wall211of the mounting frame21and surrounded by the side wall212. The heat sink14of each of the plurality of rotatable light-emitting modules12faces the bottom wall211. A fixing head214is formed at a left side of the mounting frame21and a fixing hole215is defined in the fixing head214, whereby the illumination lamp20can be coupled to a street lamp post as a street lamp.