阅读说明：本技术 一种带有环保动力源装置的新能源电动车 (New forms of energy electric motor car with environmental protection power supply device ) 是由 卜建军 于 2021-08-03 设计创作，主要内容包括：本发明公开了一种带有环保动力源装置的新能源电动车,包括车架,所述车架头部上端位置设置有车头,所述车架头部下端位置设置有前支架,所述前支架底部设置有前轮,所述车架尾部下端位置设置有后支架,所述后支架底部设置有后轮,所述车架后端面设置有延伸托板,所述延伸托板上方设置有蓄电池箱,所述蓄电池箱后端面设置有太阳能板,所述延伸托板后端面两侧位置设置有可调节的伸缩圆杆。本发明所述的一种带有环保动力源装置的新能源电动车,属于电动车领域,通过在车架后方设置延伸托板,进而安装蓄电池箱和太阳能板,利用环保动力源为警示灯供能,提升电动车在夜间行驶时的安全性,同时在延伸托板后方设置防撞框板,增强防护性能。(The invention discloses a new energy electric vehicle with an environment-friendly power source device, which comprises a vehicle frame, wherein a vehicle head is arranged at the upper end of the head of the vehicle frame, a front support is arranged at the lower end of the head of the vehicle frame, front wheels are arranged at the bottom of the front support, a rear support is arranged at the lower end of the tail of the vehicle frame, rear wheels are arranged at the bottom of the rear support, an extension supporting plate is arranged on the rear end surface of the vehicle frame, a storage battery box is arranged above the extension supporting plate, a solar panel is arranged on the rear end surface of the storage battery box, and adjustable telescopic round rods are arranged at two sides of the rear end surface of the extension supporting plate. The invention relates to a new energy electric vehicle with an environment-friendly power source device, which belongs to the field of electric vehicles.)

1. The utility model provides a new forms of energy electric motor car with environmental protection power supply device which characterized in that: comprises a frame (1), a headstock (3) is arranged at the upper end of the head of the frame (1), a front support (4) is arranged at the lower end of the head of the frame (1), front wheels (5) are arranged at the bottom of the front support (4), a rear support (6) is arranged at the lower end of the tail of the frame (1), rear wheels (7) are arranged at the bottom of the rear support (6), an extension supporting plate (8) is arranged on the rear end surface of the frame (1), a storage battery box (10) is arranged above the extension supporting plate (8), a solar panel (11) is arranged on the rear end surface of the storage battery box (10), adjustable telescopic round rods (16) are arranged at two sides of the rear end surface of the extension supporting plate (8), an anti-collision frame plate (17) is arranged at the tail of each telescopic round rod (16), two support columns (18) are arranged on the lower end surface of the extension supporting plate (8), support column (18) bottom is provided with spreader (19), spreader (19) outer lane rear end position is provided with fixed plate (21), fixed plate (21) rear is provided with adjustable warning light (22), be provided with cable (43) between battery box (10) and warning light (22).

2. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 1, characterized in that: extend layer board (8) up end afterbody position and be provided with two bottom plates (15), bottom plate (15) top is connected to terminal surface under battery box (10), extend layer board (8) up end head position and be provided with back riser (9), terminal surface passes through welded fastening to back riser (9) rear end face before battery box (10), battery box (10) up end is provided with umbrella receiver (12).

3. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 2, characterized in that: the bicycle frame is characterized in that a cushion (2) is arranged on the upper end face of the bicycle frame (1) in front of a rear vertical plate (9), an elastic cushion (13) is arranged in the middle of the front end face of the rear vertical plate (9), grips (14) are arranged on two sides of the front end face of the rear vertical plate (9), and the grips (14) are respectively located on two sides of the cushion (2).

4. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 1, characterized in that: the fixing plate (21) is located in the middle of the rear portion of the cross column (19), the fixing plate (21), the cross column (19) and the supporting columns (18) are fixed through welding, and a pair of inclined supporting rods (20) is arranged between the cross column (19) and the rear support (6).

5. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 1, characterized in that: the warning light (22) afterbody is provided with a pair of rearmounted straight board (23), rearmounted straight board (23) are located warning light (22) afterbody upper and lower extreme position respectively, fixed plate (21) rear end face upper and lower extreme position is provided with rectangle spout (24), the width and fixed plate (21) of rectangle spout (24) equal.

6. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 5, characterized in that: an adjustable self-clamping block (25) is arranged at the end of the inner side end face of the rear straight plate (23), an inner clamping groove (26) is formed in the bottom of the rectangular sliding groove (24) corresponding to the self-clamping block (25), and the front end face of the self-clamping block (25) is an arc face.

7. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 6, characterized in that: the rear straight plate (23) is characterized in that an outer straight hole (27) is formed in the end face of the inner side of the rear straight plate (23) corresponding to the clamping block (25), an embedded straight groove (28) is formed in the rear portion of the outer straight hole (27), an adjustable upper pressing plate (30) and an adjustable lower pressing plate (29) are arranged at the inner upper end and the inner lower end of the embedded straight groove (28) respectively, a built-in spring (31) is arranged between the upper pressing plate (30) and the lower pressing plate (29), and the tail portion of the clamping block (25) penetrates through the outer straight hole (27) and is connected to the end face of the outer side of the lower pressing plate (29).

8. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 7, characterized in that: the improved structure is characterized in that a transmission rod (32) is arranged in the middle of the inner side end face of the lower pressing plate (29), an inner circular groove (35) is formed in the outer side end face of the rear straight plate (23) corresponding to the transmission rod (32), the tail of the inner circular groove (35) is connected to the embedded straight groove (28), the transmission rod (32) penetrates through the inner ring of the upper pressing plate (30) and the inner ring of the built-in spring (31), the transmission rod (32) is movably connected with the upper pressing plate (30), the head of the transmission rod (32) extends out of the inner circular groove (35) and is provided with an adjusting circular plate (33), the adjusting circular plate (33) is located in the outer side position of the rectangular sliding groove (24), and a handle (34) is arranged on the outer side end face of the adjusting circular plate (33).

9. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 1, characterized in that: the anti-collision frame plate is characterized in that a plurality of reinforcing support plates (36) are arranged on the inner ring of the anti-collision frame plate (17), the anti-collision frame plate (17) and the reinforcing support plates (36) are integrally formed, the tail parts of the telescopic round rods (16) are respectively connected to the two sides of the bottom of the anti-collision frame plate (17), and the telescopic round rods (16) and the anti-collision frame plate (17) are fixed through welding.

10. The new energy electric vehicle with the environment-friendly power source device as claimed in claim 9, characterized in that: the extension layer board (8) rear end face both sides position is provided with outer round hole (38) corresponding flexible round bar (16), outer round hole (38) inside is provided with built-in circular slot (39), built-in circular slot (39) bottom is provided with interior plectane (40), the terminal surface is provided with buffer spring (41) before interior plectane (40), buffer spring (41) head is provided with outer plectane (42), flexible round bar (16) head is stretched into built-in circular slot (39) and is provided with and impels plectane (37), impel plectane (37) and flexible round bar (16) component as an organic whole, the diameter of interior plectane (40), outer plectane (42), impel plectane (37) equals, impel plectane (37) and be located outer plectane (42) outside position.

Technical Field

The invention relates to the field of electric vehicles, in particular to a new energy electric vehicle with an environment-friendly power source device.

Background

The new energy electric vehicle is a two-wheeled transportation tool commonly used by residents, has the advantages of small volume, quick acceleration, convenient operation and the like, is favored by a plurality of users, is lack of a stable warning device, only warns through a small steering lamp when the electric vehicle turns around, because the electric vehicle is started and turns to fast, the driver often can not keep adjusting the turn signal lamp all the way, meanwhile, when the electric bicycle runs straight in an area with poor light at night and the like, the tail part of the electric bicycle has no good warning effect, therefore, the driver of the motor vehicle can hardly observe the moving direction of the electric vehicle, so that the electric vehicle has certain potential safety hazard, the tail part of the electric vehicle is lack of an effective anti-collision device, in urban roads in peak periods, the number of electric vehicles is large, rear-end collisions among the electric vehicles are easily caused, and unnecessary loss is caused to drivers.

Disclosure of Invention

The invention mainly aims to provide a new energy electric vehicle with an environment-friendly power source device, which can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

a new energy electric vehicle with an environment-friendly power source device comprises a vehicle frame, a vehicle head is arranged at the upper end of the head of the vehicle frame, a front bracket is arranged at the lower end of the head part of the frame, a front wheel is arranged at the bottom of the front bracket, a rear bracket is arranged at the lower end of the tail part of the frame, the bottom of the rear support is provided with a rear wheel, the rear end surface of the frame is provided with an extension supporting plate, a storage battery box is arranged above the extension supporting plate, the rear end face of the storage battery box is provided with a solar panel, the two sides of the rear end face of the extension supporting plate are provided with adjustable telescopic round rods, the tail part of the telescopic round rod is provided with an anti-collision frame plate, the lower end surface of the extension supporting plate is provided with two supporting columns, the utility model discloses a warning device, including support column, spreader, fixed plate, warning light, battery box and warning light, the support column bottom is provided with the spreader, spreader outer lane rear end position is provided with the fixed plate, the fixed plate rear is provided with adjustable warning light, be provided with the cable between battery box and the warning light.

Preferably, the tail of the upper end face of the extension supporting plate is provided with two bottom plates, the tops of the bottom plates are connected to the lower end face of the storage battery box, the head of the upper end face of the extension supporting plate is provided with a rear vertical plate, the front end face of the storage battery box is fixed to the rear end face of the rear vertical plate through welding, and the upper end face of the storage battery box is provided with an umbrella storage box.

Preferably, the upper end face of the frame is provided with a cushion in front of the rear vertical plate, the middle of the front end face of the rear vertical plate is provided with an elastic cushion, the two sides of the front end face of the rear vertical plate are provided with handles, and the handles are respectively located on the two sides of the cushion.

Preferably, the fixed plate is located at the middle position behind the cross column, the fixed plate, the cross column and the support columns are fixed through welding, and a pair of inclined support rods is arranged between the cross column and the rear support.

Preferably, the tail part of the warning lamp is provided with a pair of rear straight plates, the rear straight plates are respectively positioned at the upper end position and the lower end position of the tail part of the warning lamp, rectangular sliding grooves are formed in the upper end position and the lower end position of the rear end surface of the fixing plate, and the width of each rectangular sliding groove is equal to that of the fixing plate.

Preferably, an adjustable self-clamping block is arranged at the end of the inner side end face of the rear straight plate, an inner clamping groove is formed in the bottom of the rectangular sliding groove corresponding to the self-clamping block, and the front end face of the self-clamping block is an arc face.

Preferably, the inner side end face of the rear straight plate is provided with an outer straight hole corresponding to the clamping block, an embedded straight groove is arranged behind the outer straight hole, an adjustable upper pressing plate and an adjustable lower pressing plate are respectively arranged at the upper end and the lower end of the embedded straight groove, a built-in spring is arranged between the upper pressing plate and the lower pressing plate, and the tail portion of the clamping block penetrates through the outer straight hole and is connected to the outer side end face of the lower pressing plate.

Preferably, a transmission rod is arranged in the middle of the end face of the inner side of the lower pressing plate, an inner circular groove is formed in the end face of the outer side of the rear straight plate, corresponding to the transmission rod, the tail of the inner circular groove is connected to the inner embedded straight groove, the transmission rod penetrates through the upper pressing plate and the inner ring of the built-in spring, the transmission rod is movably connected with the upper pressing plate, the head of the transmission rod extends out of the inner circular groove and is provided with an adjusting circular plate, the adjusting circular plate is located in the position of the outer side of the rectangular sliding groove, and.

Preferably, the inner ring of the anti-collision frame plate is provided with a plurality of reinforcing support plates, the anti-collision frame plate and the reinforcing support plates are integrally formed members, the tail parts of the telescopic round rods are respectively connected to the two sides of the bottom of the anti-collision frame plate, and the telescopic round rods and the anti-collision frame plate are fixed through welding.

Preferably, the positions of two sides of the rear end face of the extension supporting plate are provided with outer circular holes corresponding to the telescopic circular rods, the inner portions of the outer circular holes are provided with built-in circular grooves, the bottoms of the built-in circular grooves are provided with inner circular plates, the front end faces of the inner circular plates are provided with buffer springs, the heads of the buffer springs are provided with outer circular plates, the heads of the telescopic circular rods stretch into the built-in circular grooves and are provided with propulsion circular plates, the propulsion circular plates and the telescopic circular rods form an integral component, the diameters of the inner circular plates, the outer circular plates and the propulsion circular plates are equal, and the propulsion circular plates are located on the outer sides of the outer circular plates.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the extension supporting plate is arranged at the rear of the frame, the storage battery box and the solar panel are further installed, energy is supplied to the warning lamp by utilizing an environment-friendly power source, the safety of the electric vehicle during driving at night is improved, meanwhile, the anti-collision frame plate is arranged at the rear of the extension supporting plate, the protective performance is enhanced, the rear straight plate is arranged at the tail of the warning lamp, the adjustable self-clamping block is installed, the self-clamping block is assembled and fixed by matching with the fixing plate, the warning lamp is more convenient to disassemble and assemble, the subsequent maintenance is convenient to carry out, the telescopic round rod and the pushing round plate are arranged in front of the anti-collision frame plate, and the inner round plate, the outer round plate and the buffer spring are arranged in the built-in round groove, so that the tail part of the electric vehicle is effectively protected, the impact strength is reduced, and the vehicle and the warning device are prevented from being damaged.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a retaining plate according to the present invention;

FIG. 3 is a schematic diagram of the rear straight plate according to the present invention;

FIG. 4 is an enlarged view taken at A in FIG. 3;

FIG. 5 is a schematic view of the crash panel of the present invention;

fig. 6 is a schematic diagram of the extension pallet of the present invention.

In the figure: 1. a frame; 2. a cushion; 3. a headstock; 4. a front bracket; 5. a front wheel; 6. a rear bracket; 7. a rear wheel; 8. an extension pallet; 9. a rear vertical plate; 10. a battery case; 11. a solar panel; 12. an umbrella storage box; 13. an elastic pad; 14. a grip; 15. a base plate; 16. a telescopic round bar; 17. an anti-collision frame plate; 18. a support pillar; 19. a cross post; 20. a diagonal brace; 21. a fixing plate; 22. a warning light; 23. a rear straight plate; 24. a rectangular chute; 25. self-clamping blocks; 26. an inner clamping groove; 27. an outer straight hole; 28. a straight groove is embedded; 29. a lower pressing plate; 30. an upper pressure plate; 31. a built-in spring; 32. a transmission rod; 33. adjusting the circular plate; 34. a handle; 35. an inner circular groove; 36. reinforcing the support plate; 37. pushing the circular plate; 38. an outer circular hole; 39. a circular groove is arranged inside; 40. an inner circular plate; 41. a buffer spring; 42. an outer circular plate; 43. a cable.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in figures 1-6, a new energy electric vehicle with an environment-friendly power source device comprises a vehicle frame 1, a vehicle head 3 is arranged at the upper end of the head of the vehicle frame 1, a front support 4 is arranged at the lower end of the head of the vehicle frame 1, front wheels 5 are arranged at the bottom of the front support 4, a rear support 6 is arranged at the lower end of the tail of the vehicle frame 1, rear wheels 7 are arranged at the bottom of the rear support 6, an extension supporting plate 8 is arranged on the rear end surface of the vehicle frame 1, a storage battery box 10 is arranged above the extension supporting plate 8, a solar panel 11 is arranged on the rear end surface of the storage battery box 10, adjustable telescopic round rods 16 are arranged at two sides of the rear end surface of the extension supporting plate 8, an anti-collision frame plate 17 is arranged at the tail of the telescopic round rods 16, two supporting columns 18 are arranged on the lower end surface of the extension supporting column 8, a cross column 19 is arranged at the bottom of the supporting column 18, a fixing plate 21 is arranged at the rear end of the outer ring of the cross column 19, an adjustable warning lamp 22 is arranged behind the fixing plate 21, a cable 43 is provided between the battery case 10 and the warning lamp 22.

In the invention, in order to improve the stability of the storage battery box 10 and simultaneously improve the functionality of the electric vehicle, so that the electric vehicle can prevent small articles such as umbrellas and the like, two bottom plates 15 are arranged at the tail part of the upper end surface of the extension supporting plate 8, the top parts of the bottom plates 15 are connected to the lower end surface of the storage battery box 10, a rear vertical plate 9 is arranged at the head part of the upper end surface of the extension supporting plate 8, the front end surface of the storage battery box 10 is fixed to the rear end surface of the rear vertical plate 9 through welding, and an umbrella accommodating box 12 is arranged at the upper end surface of the storage battery box 10.

In the invention, in order to improve the riding experience of passengers in the back row of the electric vehicle, the seat cushion 2 is arranged on the upper end surface of the vehicle frame 1 in front of the back vertical plate 9, the elastic cushion 13 is arranged in the middle of the front end surface of the back vertical plate 9, the handles 14 are arranged on two sides of the front end surface of the back vertical plate 9, and the handles 14 are respectively arranged on two sides of the seat cushion 2.

In the invention, in order to improve the stability of the fixing plate 21 and the warning light 22, the fixing plate 21 is located at the middle position behind the cross column 19, the fixing plate 21, the cross column 19 and the supporting column 18 are fixed by welding, and a pair of inclined supporting rods 20 is arranged between the cross column 19 and the rear support 6.

In the invention, in order to facilitate the installation of the warning lamp 22 and ensure the stability after installation, the tail part of the warning lamp 22 is provided with a pair of rear straight plates 23, the rear straight plates 23 are respectively positioned at the upper end and the lower end of the tail part of the warning lamp 22, the upper end and the lower end of the rear end surface of the fixing plate 21 are provided with rectangular sliding grooves 24, the width of the rectangular sliding grooves 24 is equal to that of the fixing plate 21, the end part of the inner side end surface of the rear straight plate 23 is provided with an adjustable self-clamping block 25, the bottom of the rectangular sliding groove 24 is provided with an inner clamping groove 26 corresponding to the self-clamping block 25, and the front end surface of the self-clamping block 25 is a cambered surface.

In the invention, in order to enable the self-clamping block 25 to extend out again for resetting after adjustment, the inner side end face of the rear straight plate 23 is provided with an outer straight hole 27 corresponding to the self-clamping block 25, an inner straight groove 28 is arranged behind the outer straight hole 27, the upper end position and the lower end position in the inner straight groove 28 are respectively provided with an adjustable upper pressing plate 30 and a lower pressing plate 29, an inner spring 31 is arranged between the upper pressing plate 30 and the lower pressing plate 29, and the tail part of the self-clamping block 25 penetrates through the outer straight hole 27 and is connected to the outer side end face of the lower pressing plate 29.

In the present invention, in order to facilitate the adjustment of the position of the self-locking block 25, thereby changing the fixing state between the rear straight plate 23 and the fixing plate 21, and thereby rapidly detaching the warning light 22, the middle position of the inner side end surface of the lower pressing plate 29 is provided with the transmission rod 32, the outer side end surface of the rear straight plate 23 is provided with the inner circular groove 35 corresponding to the transmission rod 32, the tail of the inner circular groove 35 is connected to the inner embedded straight groove 28, the transmission rod 32 passes through the inner rings of the upper pressing plate 30 and the inner spring 31, the transmission rod 32 is movably connected with the upper pressing plate 30, the head of the transmission rod 32 extends out of the inner circular groove 35 and is provided with the adjustment circular plate 33, the adjustment circular plate 33 is located at the outer side position of the rectangular sliding groove 24, and the outer side end surface of the adjustment circular plate 33 is provided with the handle 34.

In the invention, in order to protect the tail part of the electric vehicle, reduce the impact in the rear-end collision and simultaneously avoid damaging the warning lamp 22, a plurality of reinforcing support plates 36 are arranged on the inner ring of an anti-collision frame plate 17, the anti-collision frame plate 17 and the reinforcing support plates 36 are integrated into a whole, the tail part of a telescopic circular rod 16 is respectively connected to two sides of the bottom of the anti-collision frame plate 17, the telescopic circular rod 16 and the anti-collision frame plate 17 are fixed by welding, outer circular holes 38 are arranged on two sides of the rear end surface of an extension supporting plate 8 corresponding to the telescopic circular rod 16, a built-in circular groove 39 is arranged inside the outer circular holes 38, an inner circular plate 40 is arranged at the bottom of the built-in circular groove 39, a buffer spring 41 is arranged on the front end surface of the inner circular plate 40, an outer circular plate 42 is arranged at the head part of the buffer spring 41, the head part of the telescopic circular rod 16 extends into the built-in circular groove 39 and is provided with a propelling circular plate 37, the propelling circular plate 37 and the telescopic circular rod 16 are integrated into a whole, the inner circular plate 40, the outer circular plate 42 and the pushing circular plate 37 have the same diameter, and the pushing circular plate 37 is located outside the outer circular plate 42.

It should be noted that, the present invention is a new energy electric vehicle with an environment-friendly power source device, when in use, the solar panel 11 behind the storage battery box 10 continuously absorbs solar energy, and supplies energy to the warning light 22 below through the cable 43, so that the warning light 22 is kept high and bright, even under the condition that the driver does not turn on the turn light, the present invention still has obvious warning effect, so that other drivers in the road can quickly and effectively observe the electric vehicle driver, thereby reducing the risk, when the warning light 22 needs to be replaced or overhauled, the adjusting circular plate 33 above and below the fixing plate 21 can be found, the outer end face of the adjusting circular plate 33 is provided with the handle 34, the handle 34 is grasped and pulled outwards, thereby driving the connected transmission rod 32 to move, the transmission rod 32 drives the connected lower pressing plate 29 to move, the lower pressing plate 29 presses the built-in spring 31 above, and the built-in spring 31 is compressed under the stress, the lower pressing plate 29 drives the connected self-clamping block 25 to move simultaneously, so that the self-clamping block 25 is separated from the inner clamping groove 26, the rear straight plate 23 can be pulled out, the warning lamp 22 is disassembled for maintenance, the rear straight plate 23 can be directly installed inwards after the maintenance is finished, the rear straight plate 23 is extruded from the arc surface of the clamping block 25, the self-clamping block 25 is stressed again and compressed inwards until the position of the inner clamping groove 26 is reached, at the moment, the non-stressed self-clamping block 25 extends out under the action of elastic force and enters the inner clamping groove 26, the stability of the warning lamp 22 can be guaranteed, when a driver drives the electric vehicle to drive in areas with poor light at night, the continuously high-brightness warning lamp 22 can warn surrounding vehicles, other drivers can find the electric vehicle more easily, the risk is reduced, the safety of the new energy electric vehicle is improved comprehensively, even if the driver does not turn on the steering lamp, the warning still can be effectively carried out, when the electric vehicle carries two persons at the same time, a rear passenger can lean the back against the elastic cushion 13 on the front end face of the rear vertical plate 9, and can grasp the handle 14 on the front end face of the rear vertical plate 9 with both hands, so that the rear passenger is more comfortable and safe, and the experience of a user is improved, meanwhile, the umbrella storage box 12 is arranged above the storage battery box 10, and small-sized articles such as umbrellas can be placed by utilizing the umbrella storage box 12, so that a driver can go out more conveniently, when rear-end collision occurs between the electric vehicles, the anti-collision frame plate 17 at the tail part of the electric vehicle is impacted, so as to drive the telescopic circular rod 16 connected in front to move forwards, the telescopic circular rod 16 drives the propelling circular plate 37 connected with the head to move, when the propelling circular plate 37 moves, the outer circular plate 42 in front is extruded, so that the outer circular plate 42 moves inwards along the built-in circular groove 39, when the outer circular plate 42 moves, the buffer spring 41 connected is extruded, so that the buffer spring 41 is compressed under the stress, therefore, the impact received by the elastic force is effectively buffered, the tail of the electric vehicle is prevented from being directly impacted, the impact strength is reduced, and the vehicle and the warning device are prevented from being damaged.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.