An electrically angle-adjustable speaker includes a seat unit, a rotation unit and a speaker unit. A hole is provided at the central portion of the seat unit and a horizontal-rotation driving mechanism is provided by the hole. An arcuate toothed track is provided on the rotation unit, and a limiting track is provided below the track. A hole is provided at the central portion of the rotation unit. A vertical-rotation driving mechanism and a first limiting device are provided in the front portion of the hole. Two pivot bearings are provided in the rear portion of the hole. A toothed track and a positioning track are provided on the arcuate upper surface of the speaker unit. After the aforesaid components are put together, the electrically angle-adjustable speaker of the present invention is formed.

BACKGROUND OF THE INVENTION

1. Field of Invention

The invention generally relates to an electrically angle-adjustable speaker. More particularly, the invention relates to an electrically angle-adjustable speaker that may be fitted on a ceiling or be hidden in a ceiling and may be electrically rotated horizontally and vertically so that the speaker unit may point at various directions.

2. Description of Related Art

As of now, many people have hi-fi speakers, home theater speakers, karaoke speakers, etc. in their homes. Some companies have speakers fitted on the ceiling of their conference room. With the speakers, a higher level of audio enjoyment may be achieved or people may have a better understanding of the contents of a meeting.

However, the speakers of the prior art are usually fitted on a ceiling and the angles that they are pointing may not be electrically adjusted. If the angle of a speaker is to be adjusted, we have to adjust it manually; if a speaker is fixedly fitted, its angle may not be adjusted.

From the above, we can see that the speakers of the prior art have many disadvantages and need to be improved.

To eliminate the disadvantages of the speakers of the prior art, the inventor has put in a lot of effort in the subject and has successfully come up with the electrically angle-adjustable speaker of the present invention.

SUMMARY OF THE INVENTION

The present invention is to provide an electrically angle-adjustable speaker that may be fitted on a ceiling or be hidden in a ceiling and may be rotated horizontally and vertically so that the speaker unit may point at various directions.

Another, the present invention is to provide an electrically angle-adjustable speaker that may be electrically rotated horizontally and vertically so that a user does not have to adjust it manually.

Third, the present invention is to provide an electrically angle-adjustable speaker that the speaker unit may automatically return to its original position and/or be hidden in the ceiling when the audio signal stops or when the speaker unit is turned off.

Fourth, the present invention is to provide an electrically angle-adjustable speaker that is structurally simple and easy to use.

The electrically angle-adjustable speaker of the present invention comprises a seat unit, a rotation unit and a speaker unit. A hole is provided at the central portion of the seat unit. A horizontal-rotation driving mechanism is provided by the hole and has a transmission gear. The rotation unit is fitted in the hole. An arcuate toothed track is provided on the rotation unit and may be engaged with the transmission gear of the horizontal-rotation driving mechanism. A limiting member is provided on each end of the track. A limiting track is provided below the toothed track, and a plurality of positioning members are provided along the limiting track. A hole is provided at the central portion of the rotation unit. A vertical-rotation driving mechanism and a first limiting device are provided in the front portion of the hole. The vertical-rotation driving mechanism has a transmission gear and may be engaged with the toothed track of the speaker unit. A second limiting device is disposed in the hole. Either of the two limiting devices has a sliding piece, and a micro switch is provided on each sliding piece. Two pivot bearings are provided in the rear portion of the hole. One or more rollers are circumferentially provided in the lower portion of the rotation unit and may assist the horizontal rotation of the rotation unit. The speaker unit may be fitted onto the rotation unit through two pivot bearings. A toothed track and a positioning track are provided on the arcuate upper surface of the speaker unit. Several positioning members are provided along the positioning track. After the aforesaid components are put together, the electrically angle-adjustable speaker of the present invention is formed.

These features and advantages of the present invention will be fully understood and appreciated from the following detailed description of the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As illustrated inFIGS. 1 and 2, the electrically angle-adjustable speaker of the present invention comprises a seat unit1, a rotation unit2and a speaker unit3.

A hole11is provided at the central portion of the seat unit1. A horizontal-rotation driving mechanism12is provided by the hole11and has a transmission gear121.

An arcuate toothed track21is provided on the rotation unit2, and a limiting member22is provided on each end of the track21. A limiting track23is provided below the track21, and a plurality of positioning members231are provided along the limiting track23. A hole24is provided at the central portion of the rotation unit2. A vertical-rotation driving mechanism25and a first limiting device26are provided in the front portion of the hole24. The vertical-rotation driving mechanism25has a transmission gear251. A second limiting device27is disposed in the hole24. Either of the two limiting devices26and27has a sliding piece261and271, and a micro switch262and272is provided on each sliding piece261and271. Two pivot bearings28are provided in the rear portion of the hole24. One or more rollers29are circumferentially provided in the lower portion of the rotation unit2. The rotation unit2is fitted into the hole11of the seat unit1. The toothed track21may be engaged with the transmission gear121of the horizontal-rotation driving mechanism12. When the transmission gear121reaches either limiting member22, the latter can stop the horizontal rotation of the rotation unit2. In operation, with regard to the first limiting device26, the micro switch262and the sliding piece261allow the vertical rotation of the speaker unit3, and the micro switch262of the first limiting device26may be positioned at one of the positioning members321of the positioning track32so as to control the angle of the vertical rotation of the speaker unit3. Similarly, in operation, with regard to the second limiting device27, the micro switch272and the sliding piece271allow the horizontal rotation of the speaker unit3, and the micro switch272of the second limiting device27may be positioned at one of the positioning members231of the limiting track23so as to control the angle of the horizontal rotation of the speaker unit3. The rollers29may assist the horizontal rotation of the rotation unit2.

The speaker unit3has an arcuate upper surface. A toothed track31and a positioning track32are provided on the arcuate upper surface of the speaker unit3. Several positioning members321are provided along the positioning track32. A limiting member33is provided on each end of the toothed track31. A pivot34is provided on each side of the speaker unit3. The two pivots34may be fitted onto the two pivot bearings28so as to allow the speaker unit3to rotate vertically in the hole24of the rotation unit2. The toothed track31may be engaged with the transmission gear251of the vertical-rotation driving mechanism25. When the transmission gear251reaches either limiting member33, the latter can stop the vertical rotation of the speaker unit3.

After the aforementioned components are put together, the electrically angle-adjustable speaker of the present invention is formed. As illustrated inFIGS. 3A,3B and3C, the driving forces provided by the horizontal transmission mechanism12and the vertical-rotation driving mechanism25, the limiting track23and the positioning track32allow the vertical rotation of the speaker unit3. Also, the speaker unit3may rotate horizontally. Hence, the speaker unit3may be adjusted to point at various directions. In addition, when the audio signal stops or when the speaker unit is turned off, the speaker unit3may automatically return to its original position and be hidden in the ceiling. In addition, the electrically angle-adjustable speaker of the present invention has a unique appearance.

In contrast to the prior art speaker, the electrically angle-adjustable speaker of the present invention has the following three advantages:

1. The electrically angle-adjustable speaker of the present invention of the present invention may be fitted on a ceiling hidden in a ceiling and may be rotated horizontally and vertically so that the speaker unit may point at various directions.

2. The electrically angle-adjustable speaker of the present invention of the present invention may be electrically rotated horizontally and vertically so that a user does not have to adjust it manually.

3. When the audio signal stops or when the speaker unit is turned off, the speaker unit may automatically return to its original position or be hidden in the ceiling.

4. The electrically angle-adjustable speaker of the present invention of the present invention is structurally simple and easy to use.