阅读说明：本技术 儿童玩具车 (Children toy car ) 是由 蔡辉 朱铁文 刘鹏 徐波 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种儿童玩具车,儿童玩具车包括车架、设置在车架前部的前轮组件、设于车架后部的后轮组件,以及设于车架上且具有座位的座位装置,车架包括主车架、能够相对主车架沿前后方向滑动连接的后车架、下端部与主车架转动连接的方向杆,以及设置在方向杆、座位及后车架之间的联动机构,儿童玩具车具有第一使用状态和第二使用状态,儿童玩具车由第一使用状态向第二使用状态转换的过程中,方向杆相对主车架向前转动,座位相对主车架向前并向上运动,且后车架相对主车架向前滑动靠拢。本发明的儿童玩具车具有漂移效果,且具有两种使用状态,趣味性高。(The invention discloses a children toy car, which comprises a frame, a front wheel assembly arranged at the front part of the frame, a rear wheel assembly arranged at the rear part of the frame, and a seat device arranged on the frame and provided with a seat, wherein the frame comprises a main frame, a rear frame capable of being in sliding connection with the main frame in the front-back direction, a direction rod with the lower end part rotationally connected with the main frame, and a linkage mechanism arranged among the direction rod, the seat and the rear frame. The toy car for children has a drifting effect, has two using states and is high in interestingness.)

1. The utility model provides a children's toy car, children's toy car includes the frame, sets up anterior front wheel subassembly of frame, locate the rear wheel subassembly at frame rear portion, and locate on the frame and have the seat device of seat, its characterized in that: the frame includes the main frame, can be relative the main frame along fore-and-aft direction sliding connection's back frame, lower tip with the main frame rotates the direction bar of connection, and sets up the direction bar the seat reaches link gear between the back frame, children's toy car has first user state and second user state, children's toy car by first user state to the in-process of second user state conversion, the direction bar is relative the main frame rotates forward, the seat is relative the main frame is forward and upward movement, just the back frame is relative the main frame slides forward and draws close.

2. The children's toy vehicle of claim 1, wherein: the rear frame comprises a connecting frame extending along the front-rear direction and a rear wheel frame rotationally arranged at the rear part of the connecting frame around a swinging central line extending along the vertical direction, the connecting frame is connected with the main frame in a relative sliding manner along the front-rear direction, and the rear wheel assemblies are provided with two groups of wheels which are respectively arranged at the left side and the right side of the rear part of the rear wheel frame.

3. The children's toy vehicle of claim 2, wherein: when the children toy car is in the first using state, the connecting frame extends backwards relative to the main frame, and the rear wheel frame is positioned behind the main frame; when the bicycle is in the second using state, the connecting frame is folded forwards relative to the main frame, the rear wheel frame is positioned at the bottom of the main frame, and the swinging center line is positioned in front of the rearmost end of the main frame along the front-back direction.

4. The children's toy vehicle of claim 1, wherein: the rear frame is provided with a rear cross rod which is positioned at the rear part and extends along the left-right direction, the rear wheel assemblies are provided with a plurality of universal wheel assemblies, and the rear wheel assemblies are arranged on the rear cross rod at intervals along the left-right direction.

5. The children's toy vehicle of claim 1, wherein: the rear frame is arranged lower than the main frame in the vertical direction, the main frame is provided with a front frame rod extending in the front-back direction, the rear frame is provided with a sliding part positioned in the front part, and the sliding part is arranged on the front frame rod in a manner of relatively sliding along the length direction of the front frame rod; and/or the presence of a gas in the gas,

the front wheel assemblies are provided with two groups which are respectively arranged at the left side and the right side of the front part of the main frame, the rear wheel assemblies are provided with two groups which are respectively arranged at the left side and the right side of the rear part of the rear frame, and the distance between the two groups of front wheel assemblies in the left-right direction is larger than that between the two groups of rear wheel assemblies in the left-right direction.

6. The children's toy vehicle of claim 1, wherein: an included angle alpha is formed between the extension direction of the length of the direction rod and the horizontal plane, wherein alpha is more than 0 degree and less than or equal to 90 degrees, and the included angle alpha is increased in the process of converting the child toy car from the first use state to the second use state.

7. The children's toy vehicle of any one of claims 1 to 6, wherein: the seat device further comprises two support rods arranged between the seat and the main frame, the two support rods are arranged in tandem, two ends of each support rod are respectively and rotatably connected to the seat and the main frame, the seat is provided with a first position and a second position, the first position is higher than the second position, and when the seat is in the first position, the support rods extend in the up-down direction and are supported between the seat and the main frame; when the seat is at the second position, the support rod extends along the front-back direction and is folded between the seat and the main frame.

8. The children's toy vehicle of claim 7, wherein: the linkage mechanism comprises a linkage rod which is rotatably arranged between the direction rod and one of the support rods.

9. The children's toy vehicle of claim 8, wherein: the linkage mechanism further comprises a driving rod which is rotationally connected between the rear frame and one of the supporting rods.

10. The children's toy vehicle of claim 9, wherein: the two support rods are respectively a first support rod and a second support rod, the first support rod is located in front of the second support rod, the driving rod is rotatably arranged between the rear frame and the first support rod, and the linkage rod is rotatably arranged between the direction rod and the first support rod.

Technical Field

The invention relates to a toy car for children.

Background

In order to improve the interestingness, part of the existing toy cars for children are designed to have a drifting effect, but the toy cars can only be used by users in a single driving posture, and as the using time is prolonged, the drifting effect in the single driving posture is easy to make children tired; meanwhile, the parents purchase additional drift cars to meet the use requirements of children, which also increases the economic burden and causes serious resource waste. Accordingly, it is an endeavor of those skilled in the art to design and manufacture a highly interesting child wandering vehicle that enables a user to drive in a variety of driving postures.

Disclosure of Invention

The invention aims to provide a novel children toy car.

In order to achieve the purpose, the invention adopts the technical scheme that: a children toy car comprises a car frame, a front wheel component arranged at the front part of the car frame, a rear wheel component arranged at the rear part of the car frame, and a seat device arranged on the frame and provided with a seat, wherein the frame comprises a main frame, a rear frame which can be connected with the main frame in a sliding way along the front-back direction, and a direction rod with the lower end part rotationally connected with the main frame, and a linkage mechanism arranged among the steering rod, the seat and the rear frame, wherein the children toy car has a first use state and a second use state, during the process of the child toy car from the first use state to the second use state, the direction rod rotates forwards relative to the main frame, the seat moves forwards and upwards relative to the main frame, and the rear frame slides forwards and approaches relative to the main frame.

Preferably, the rear frame includes a connecting frame extending in a front-rear direction, and a rear wheel frame rotatably disposed at a rear portion of the connecting frame around a swing center line extending in a vertical direction, the connecting frame and the main frame are relatively slidably connected in the front-rear direction, and the rear wheel assembly has two sets respectively mounted at left and right sides of a rear portion of the rear wheel frame.

Further, when the children toy car is in the first using state, the connecting frame extends backwards relative to the main frame, and the rear wheel frame is positioned behind the main frame; when the bicycle is in the second using state, the connecting frame is folded forwards relative to the main frame, the rear wheel frame is positioned at the bottom of the main frame, and the swinging center line is positioned in front of the rearmost end of the main frame along the front-back direction.

Preferably, the rear frame has a rear cross bar located at the rear and extending in the left-right direction, the rear wheel assembly has a plurality of universal wheel assemblies, and the rear wheel assemblies are arranged on the rear cross bar at intervals in the left-right direction.

Preferably, the rear frame is disposed lower than the main frame in the vertical direction, the main frame has a front rod extending in the front-rear direction, the rear frame has a sliding portion located at the front portion, and the sliding portion is disposed on the front rod in a manner that the sliding portion can relatively slide in the length direction of the front rod; and/or the presence of a gas in the gas,

the front wheel assemblies are provided with two groups which are respectively arranged at the left side and the right side of the front part of the main frame, the rear wheel assemblies are provided with two groups which are respectively arranged at the left side and the right side of the rear part of the rear frame, and the distance between the two groups of front wheel assemblies in the left-right direction is larger than that between the two groups of rear wheel assemblies in the left-right direction.

Preferably, an included angle α is formed between the extension direction of the length of the direction bar and a horizontal plane, wherein α is more than 0 degree and less than or equal to 90 degrees, and the included angle α is increased in the process of converting the child toy car from the first use state to the second use state.

In a preferred embodiment, the seat device further includes two support rods disposed between the seat and the main frame, the two support rods being disposed one behind the other and having both ends rotatably connected to the seat and the main frame, respectively, the seat having a first position and a second position, the first position being higher than the second position, the support rods extending in an up-down direction and being supported between the seat and the main frame when the seat is in the first position; when the seat is at the second position, the support rod extends along the front-back direction and is folded between the seat and the main frame.

Further preferably, the linkage mechanism comprises a linkage rod, and the linkage rod is rotatably arranged between the direction rod and one of the support rods.

Still further preferably, the linkage mechanism further comprises a driving rod which is rotatably connected between the rear frame and one of the supporting rods.

Still further preferably, the two support rods are respectively a first support rod and a second support rod, the first support rod is located in front of the second support rod, the driving rod is rotatably disposed between the rear frame and the first support rod, and the linkage rod is rotatably disposed between the direction rod and the first support rod.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the children toy car disclosed by the invention can realize a drifting effect in two different use states, the driving postures in the different use states are different, the use states can be conveniently converted, and the children toy car has high interestingness.

Drawings

FIG. 1 is an exploded view of a frame of the present invention toy vehicle (embodiment one);

FIG. 2 is a schematic three-dimensional view of a child toy vehicle according to the present invention in a first use configuration (embodiment one);

FIG. 3 is a schematic three-dimensional view of the child toy vehicle of the present invention during the transition from the first use configuration to the second use configuration (embodiment one);

FIG. 4 is a schematic three-dimensional view of a child toy vehicle according to the present invention in a second use configuration (embodiment one);

FIG. 5 is an exploded view of the frame of the child toy vehicle of the present invention (embodiment two);

100, a frame; 200. a front wheel assembly; 300. a rear wheel assembly;

1. a main frame; 11. a side strut; 11a, a first pole segment; 11b, a second pole segment; 12. a front cross bar; 13. a transverse strut; 14. a front vehicle rod;

2. a connecting frame; 21. a first connecting rod; 22. a sliding portion (sliding sleeve); 23. a first connecting seat; 24. a rear cross bar;

3. a rear wheel carrier; 31. a rear wheel strut; 32. a second connecting rod; 33. a second connecting seat;

4. a seating device; 41. a seat frame; 41a, a seat body; 41b, a seat frame; 42. a first support bar; 42a, a lower rod section; 42b, an upper pole segment; 43. a second support bar; 5. a steering column; 6. a linkage rod; 7. a drive rod; 8. a steering wheel;

a. a swing center line.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

The description herein of the top-bottom, left-right, front-back, inner-outer, etc. orientations are defined in terms of the top-bottom, left-right, front-back, inner-outer, etc. orientations as viewed by a child seated on the child's toy vehicle.

Example one

A child's toy car, as shown in fig. 1, includes a frame 100, a front wheel assembly 200 provided at a front portion of the frame 100, and a rear wheel assembly 300 provided at a rear portion of the frame 100.

Referring to fig. 1, the vehicle frame 100 includes a main frame 1, and a rear frame slidably coupled to the main frame 1 in the front-rear direction. Specifically, the main frame 1 includes two side stays 11 respectively provided on both left and right sides of the frame 100 and each extending in the front-rear direction, and the side stays 11 have a first rod section 11a and a second rod section 11b in order from front to rear on each left and right sides of the frame 100, wherein the first rod section 11a extends obliquely downward from front to rear, and the second rod section 11b is connected to a rear end portion of the first rod section 11a and extends in the front-rear direction. A front cross bar 12 extending along the left-right direction is further arranged between the bottom front portions of the left and right second bar sections 11b, and two end portions of the front cross bar 12 in the left-right direction respectively extend out of the second bar sections 11b on the same side. The main frame 1 further comprises a cross rod 13 arranged between the rear end parts of the two side rods 11, the cross rod 13 extends in a U shape with a forward opening, a front rod 14 is arranged between the middle positions of the front cross rod 12 and the cross rod 13 in the left-right direction, and the front rod 14 extends in the front-back direction.

The rear frame is arranged lower than the main frame 1 in the up-down direction, wherein the rear frame comprises a connecting frame 2 extending in the front-back direction, and a rear wheel frame 3 rotatably arranged at the rear part of the connecting frame 2 around a swinging central line a extending in the vertical direction, and the connecting frame 2 and the main frame 1 are connected in a relative sliding manner in the front-back direction. Specifically, the connecting frame 2 includes a first connecting rod 21 extending in the front-rear direction, and a sliding portion 22 fixedly disposed at the front end of the first connecting rod 21, where the sliding portion 22 is slidably disposed on the front rod 14 along the length direction of the front rod 14, and specifically, in this embodiment, the sliding portion 22 is a sliding sleeve slidably disposed on the front rod 14 along the length extending direction of the front rod 14. The rear end of the connecting piece 21 is fixedly provided with a first connecting seat 23, the rear wheel frame 3 comprises a rear wheel support rod 31 extending along the left-right direction, a second connecting rod 32 extending forwards is arranged at the middle position of the left-right direction of the rear wheel support rod 31, the front end of the second connecting rod 32 is provided with a second connecting seat 33, and the first connecting seat 23 and the second connecting seat 33 are rotatably connected around a swinging central line a extending along the vertical direction.

The child toy vehicle further includes a seat assembly 4 disposed on the frame 100 and having a seat 41. The seat unit 4 further includes two support rods disposed in tandem between the seat 41 and the main frame 1, and both ends of the support rods are rotatably connected to the seat 41 and the main frame 1, respectively. Specifically, in the present embodiment, the seat 41 includes a seat body 41a and a seat frame 41b fixedly arranged at the bottom of the seat body 41a, and the two support rods are respectively a first support rod 42 and a second support rod 43 located at the rear side of the first support rod 42, wherein the first support rod 42 includes a lower rod section 42a and an upper rod section 42b whose lower end is connected to the upper portion of the lower rod section 42a, the lower rod section 42a extends in a U shape with a downward opening from top to bottom, the two lower ends of the lower rod section 42 located at the left and right sides are respectively rotatably connected to the second rod section 11b at the same side, the lower end of the upper rod section 42b is fixedly connected to the middle position of the lower rod section 42 in the left and right direction, and the upper end of the upper rod section 42b is rotatably connected to the seat frame 41 b; the second support rods 43 are respectively arranged at the left side and the right side of the frame 100, the lower end parts of the two second support rods 43 are respectively and rotatably connected to the second rod sections 11b at the same side, and the upper end parts of the two second support rods 43 are both and rotatably connected to the seat frame 41 b; the length extension directions of the upper rod section 42b and the two second support rods 43 are parallel to each other.

The seat 41 has a first position higher than the second position, and when the seat 41 is in the first position, the first support rod 42 and the second support rod 43 each extend in the up-down direction and are supported between the seat 41 and the main frame 1; when the seat 41 is in the second position, the first support rod 42 and the second support rod 43 both extend in the front-rear direction and are collected between the seat 41 and the main frame 1.

The frame 100 further comprises a direction rod 5 extending along the up-down direction and having a lower end part rotatably connected with the main frame 1, and an included angle alpha is formed between the length extending direction of the direction rod 5 and the horizontal plane, wherein alpha is larger than 0 degree and is less than or equal to 90 degrees.

The steering rod 5 is provided in association with the rotational movement of the main frame 1, the lifting movement of the seat 41, and the sliding movement of the main frame 1 and the rear frame in the front-rear direction. Specifically, the frame 100 further includes a link mechanism provided between the steering rod 5, the seat 41 and the rear frame, the link mechanism including a link rod 6 rotatably provided between the steering rod 5 and one of the support rods, and a drive rod 7 rotatably connected between the rear frame and one of the support rods. Specifically, in the present embodiment, the lower end portion of the steering rod 5 is rotatably disposed between the two first rod segments 11a on the left and right sides, and the upper end portion of the steering rod 5 is provided with the steering wheel 8. The linkage rod 6 extends along the front-back direction, the front end part of the linkage rod 6 is rotationally connected to the direction rod 5, the rear end part of the linkage rod 6 is rotationally connected to the upper rod section 42b of the first supporting rod 42, and the rotational connection position between the linkage rod 6 and the direction rod 5 is located between the upper end part and the lower end part of the direction rod 5 in the length direction of the direction rod 5. The drive lever 7 has two drive levers provided on the left and right sides of the frame 100, and one end portion of the drive lever 7 is rotatably connected to the upper lever section 42b of the first support lever 42 and the other end portion of the drive lever 7 is rotatably connected to the first connecting lever 21 of the rear frame on each of the left and right sides of the frame 100.

The front wheel assemblies 200 have two sets respectively provided at outer end portions of the front rail 12 on left and right sides, and the rear wheel assemblies 300 have two sets respectively provided at outer end portions of the rear wheel strut 31 on left and right sides, and the interval in the left-right direction of the two sets of front wheel assemblies 200 is larger than the interval in the left-right direction of the two sets of rear wheel assemblies 300.

The toy car has a first use state and a second use state, and the following describes the principle and operation steps of the toy car.

Pulling the steering wheel 8 backwards, the steering rod 5 rotates clockwise backwards around the rotational connection between the steering rod and the first rod section a, and the first support rod 42 and the second support rod 43 rotate clockwise backwards around the rotational connection between the first support rod and the side branch 11, respectively, synchronously through the transmission of the linkage rod 6, and at this time, the seat 41 is converted from the first position to the second position, that is: the seat 41 moves backward and downward; synchronously, through the transmission of the driving rod 7, the backward rotation of the first supporting rod 42 drives the first connecting rod 21 to slide backward along the length direction of the front vehicle rod 14, and the vehicle frame 100 extends in length along the front-rear direction.

Pushing the steering wheel 8 forward, the steering rod 5 rotates counterclockwise forward around the rotational connection between the steering rod and the first rod section a, and the first support rod 42 and the second support rod 43 rotate counterclockwise forward around the rotational connection between the first support rod and the side branch 11, respectively, synchronously with the linkage of the linkage rod 6, at this time, the seat 41 is shifted from the second position to the first position, that is: the seat 41 moves forward and upward; synchronously, through the transmission of the driving rod 7, the forward rotation of the first supporting rod 42 drives the first connecting rod 21 to slide forward along the length direction of the front vehicle rod 14, and the vehicle frame 100 shortens the length along the front-rear direction.

Two use states are specifically described below.

When the child toy vehicle is in the first use state, as shown in fig. 2, the connecting frame 2 extends backward relative to the main frame 1, the rear wheel frame 3 is located at the rear of the main frame 1, the seat 41 is located at the second position, the first support rod 42 and the second support rod 43 both extend in the forward and backward direction and are folded between the seat 41 and the main frame 1, and the angle value of the included angle α between the length extending direction of the direction rod 5 and the horizontal plane reaches the minimum value. In this use state, when the user sits on the seat 41, the line of sight is low, the distance between the body and the direction lever 5 in the front-rear direction is large, and the lower leg and the upper leg can be extended relatively.

In the process of converting the child toy vehicle from the first use state to the second use state, referring to fig. 3, the steering wheel 8 is pushed forward, the steering rod 5 gradually rotates counterclockwise forward around the rotational connection between the steering rod and the first rod segment 11a, the first support rod 42 and the second support rod 43 synchronously rotate counterclockwise forward around the rotational connection between the respective support rods and the side branch 11 through the transmission of the linkage rod 6, and at this time, the seat 41 is converted from the second position to the first position, that is: the seat 41 moves forward and upward; synchronously, through the transmission of the driving rod 7, the forward rotation of the first supporting rod 42 drives the first connecting rod 21 to slide forward along the length direction of the front vehicle rod 14, the first connecting rod 21 drives the rear wheel frame 3 to move forward gradually, the rear vehicle frame slides forward relative to the main vehicle frame 1 to be folded, and the vehicle frame 100 shortens the length along the front-rear direction gradually. In the above process, the angle value of the included angle α between the length extending direction of the direction lever 5 and the horizontal plane gradually increases.

When the child toy vehicle is in the second use state, as shown in fig. 4, the connecting frame 2 is folded forward relative to the main frame 1, the rear wheel frame 3 is located at the bottom of the main frame 1, the seat 41 is located at the first position, the first supporting rod 42 and the second supporting rod 43 both extend in the up-down direction and are supported between the seat 41 and the main frame 1, and the angle value of the included angle α between the length extending direction of the direction rod 5 and the horizontal plane reaches the maximum value. In this use state, when the user sits on the seat 41, the line of sight is high, the distance between the body and the direction lever 5 in the front-rear direction is small, and the lower leg and the upper leg are bent relatively.

To sum up, under first user state and second user state, rotate steering wheel 8, centrifugal force makes rear wheel carrier 3 can carry out the deflection of left and right direction around swing central line a, produces the drift effect, combines the different driving gesture of user under two kinds of user states, and children's toy car in this embodiment can make the user experience the enjoyment of carrying out the drift game under the different driving gesture, has high interest.

Example two

Referring to fig. 5, the difference between the present embodiment and the first embodiment is mainly that: in this embodiment, the rear frame is an integral rigid frame, wherein the rear frame has a rear cross bar 24 located at the rear and extending in the left-right direction, the rear wheel assemblies 300 are a plurality of universal wheel assemblies, and the rear wheel assemblies 300 are arranged on the rear cross bar 24 at intervals in the left-right direction.

Specifically, the rear frame includes a first connecting rod 21 extending in the front-rear direction, and a sliding portion 22 fixed to the front end of the first connecting rod 21, the sliding portion 22 is slidably disposed on the front rod 14 along the length direction of the front rod 14, and in this embodiment, the sliding portion 22 is a sliding sleeve slidably disposed on the front rod 14 along the length extending direction of the front rod 14. The rear end of the connecting member 21 is fixedly provided with a rear cross bar 24 extending in the left-right direction, the rear wheel assemblies 300 are provided with two sets of universal wheel assemblies, and the two sets of rear wheel assemblies 300 are respectively and universally rotatably arranged at the two end parts of the rear cross bar 24 in the left-right direction.

The toy car for children has a first use state and a second use state which can be switched, and the two use states are specifically described below.

When the child toy vehicle is in the first use state, the rear frame extends backwards relative to the main frame 1, the seat 41 is in the second position, the first support rod 42 and the second support rod 43 both extend in the front-back direction and are folded between the seat 41 and the main frame 1, and the angle value of the included angle alpha between the length extension direction of the direction rod 5 and the horizontal plane reaches the minimum value. In this use state, when the user sits on the seat 41, the line of sight is low, the distance between the body and the direction lever 5 in the front-rear direction is large, and the lower leg and the upper leg can be extended relatively.

During the transition of the children's toy vehicle from the first use state to the second use state, the steering wheel 8 is pushed forward, the steering rod 5 gradually rotates counterclockwise forward around the rotational connection between the steering rod and the first rod segment 11a, the first support rod 42 and the second support rod 43 synchronously rotate counterclockwise forward around the rotational connection between the respective support rods and the side support rods 11 through the transmission of the linkage rod 6, and at this time, the seat 41 is transitioned from the second position to the first position, that is: the seat 41 moves forward and upward; synchronously, through the transmission of the driving rod 7, the forward rotation of the first supporting rod 42 drives the first connecting rod 21 to slide forward along the length direction of the front vehicle rod 14, the rear vehicle frame slides forward relative to the main vehicle frame 1 to be folded, and the vehicle frame 100 gradually shortens the length along the front-rear direction. In the above process, the angle value of the included angle α between the length extending direction of the direction lever 5 and the horizontal plane gradually increases.

When the child toy vehicle is in the second use state, the rear frame is folded forward relative to the main frame 1, the seat 41 is in the first position, the first support rod 42 and the second support rod 43 both extend in the up-down direction and are supported between the seat 41 and the main frame 1, and the angle value of the included angle alpha between the length extension direction of the direction rod 5 and the horizontal plane reaches the maximum value. In this use state, when the user sits on the seat 41, the line of sight is high, the distance between the body and the direction lever 5 in the front-rear direction is small, and the lower leg and the upper leg are bent relatively.

To sum up, under first user state and second user state, rotate steering wheel 8, centrifugal force makes rear wheel subassembly 300 carry out the deflection of left and right direction, produces the drift effect, combines the driving gesture of user difference under two kinds of user states, and children's toy car in this embodiment can make the user experience the enjoyment of carrying out the drift recreation under the different driving gesture, has high interest.

The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.