1. Field of the Invention
The present invention relates generally to a slip ring, and more particularly to a combinative type slip ring.
2. Description of the Related Art
Typically, a conventional slip ring has several conductive rings, which are insulated from each other, fitted to a metal tube, and then the conductive rings and the tube are put in a die for injection molding. A covering will embed the conductive rings and the tube to fix the conductive rings to the tube.
The conventional slip ring has a constant size and specification, and it is very difficult to change it because of the covering. The conventional slip ring is unable to add or take off conductive rings. It is because of the covering as well. Therefore, the specified slip ring only serves for specific electronic device.
We believe that the slip ring may have strong competitiveness when the drawbacks as described above are fixed.
The primary objective of the present invention is to provide a combinative type slip ring, which may be assembled in a fast and stable way, and may change the conductive rings.
According to the objective of the present invention, a slip ring includes a spindle and a plurality of insulating rings and conductive rings alternately fitted to the spindle. The spindle has an axial wire hole. The insulating rings engage the spindle so that the insulating rings are unable to rotate relative to the spindle. The conductive rings engage the spindle or the neighboring insulating ring so that conductive rings are unable to rotate relative to the insulating ring.
In an embodiment, spindle is provided with a slot communicated with the wire hole, and the insulating ring is provided with a protrusion on a sidewall of a central hole to engage the slot of the spindle when the insulating ring is fitted to the spindle.
In an embodiment, the is provided with a slot communicated with the wire hole and two walls at opposite sides of the slot, and the insulating ring is provided with a slot on a sidewall of a central hole to engage the walls of the spindle when the insulating ring is fitted to the spindle.
In an embodiment, the insulating ring has a big ring and small ring fixed to the big ring, and the conductive ring has a central hole to engage the small ring of the insulating ring when the insulating ring and the conductive ring are fitted to the spindle.
In an embodiment, the insulating ring is provided with a slot on a side thereof, and the conductive ring is provided with a protrusion to engage the slot of the insulating ring when the insulating ring and the conductive ring are fitted to the spindle.
In an embodiment, the insulating ring is provided with two posts on a side thereof, and the conductive ring is provided with a protrusion to be rested between the posts of the insulating ring when the insulating ring and the conductive ring are fitted to the spindle.
In an embodiment, the small ring of the insulating ring has a central hole, a trench communicated with the central hole and two posts at opposite side of the trench, and the conductive ring is provided with a protrusion to be rested between the posts of the insulating ring when the insulating ring and the conductive ring are fitted to the spindle, and further wherein conductive ring is provided with an opening on the protrusion, and the opening is communicated with the trench so that a wire passes through the opening on the protrusion and the trench to the wire hole of the spindle.
In an embodiment, an end of the wire is fixed to the conductive ring by a bonding pad, and the insulating ring is provided with a recess to receive the bonding pad when the insulating ring and the conductive ring are fitted to the spindle.
Therefore, the brush holder may be formed by serially connecting the brush holder units in a fast and easy way, and it provides a stable signal transmission.
As shown in FIGS. from
The spindle 10 has an axial wire hole 12 and an axial elongated slot 14. The slot 14 has an opening 14a at an outer end, and is communicated with the wire hole 12 (
The insulating rings 20 are disk-like members, and precisely, each insulating ring 20 has a small ring 22 and a big ring 24 coupled together. The insulating ring 20 has a central hole 26 and a protrusion 28 on a sidewall of the central hole 26. The insulating ring 20 is fitted to the spindle 10 through the central hole 26, and the protrusion 28 engages the slot 14 that the insulating rings 20 may engage the spindle 10 and are unable to rotate. The protrusion 28 forms a second positioning portion.
As shown in
The conductive rings 30 are disk-like members also. Each conductive ring 30 has a central hole 32 to engage the small ring 22 of the insulating ring 20, and the conductive rings 30 will be not in contact with the spindle 10. The conductive ring 30 has a face 34 on a side and a protrusion 36 projected from the sidewall of the central hole 32. The protrusion 36 is rested between the posts 22b when the conductive ring 30 engages the insulating ring 20 (
The insulating rings 20 and the conductive rings 30 are alternately fitted to the spindle 10. The insulating rings 20 may insulate the conductive rings 30 from each other and from the spindle as well. The number of the insulating rings 20 and the conductive rings 30 to be fitted to the spindle 10 is selectable according the requirements. At last, the bearings 40 are fitted to the spindle 10 from opposite ends thereof to secure the insulating rings 20 and the conductive rings 30 (
In the present invention, the first and the last rings on the spindle 10 are the insulating rings 20 to insulate the conductive rings 30 from the bearings 40. It may provide any type of insulating members between the conductive rings 30 and the bearings 40 except the insulating rings 20 mentioned in the present invention.
As shown in FIGS. from
The spindle 10′ has a wire hole 12′ and a slot 14′ communicated with the wire hole 12′. The spindle 10′ further has two elongated walls 50 at opposite sides of the slots 14′, and the insulating ring 20′ has a recess 60 on a sidewall of a central hole 26′ thereof to engage the walls 50 when the insulating ring 20′ is fitted to the spindle 10′ (
The functions of the combinative slip ring of the present invention include:
1. No covering is needed to secure the conductive rings 20, so that the present invention may be assembled in a fast and easy way.
2. The number and module of the insulating rings 20′ are selectable to be fitted to the spindle 10, that is, we may select the very slip rings to meet our needs.
3. No glue or other fixing means is needed to fix the insulating rings 20 and conductive rings 30. Therefore, it only needs to disassemble the malfunctioned ring from the spindle, and replace a new one.
The present invention provides the slip rings to be assembled and disassembled in a fast and easy way. The specification and function of the slip ring of the present invention may be adjusted by adding or removing the conductive ring(s) for to increase the competitiveness.
The description above is a few preferred embodiments of the present invention. Any structure that involves the engagement of several brush holder units to form the brush holder should be in the scope of the present invention. These equivalences of the present invention are still in the scope of claim construction of the present invention.