阅读说明：本技术 伸缩门 (Telescopic door ) 是由 余家红 陈军 曾红军 于 2017-01-17 设计创作，主要内容包括：本发明实施方式公开了一种伸缩门,该伸缩门包括机头与门排,该门排可在该机头驱动下前后移动以展开或收缩,机头下端与门排的连接侧设有容置框,门排包括多个有轮主框架,该多个有轮主框架包括底部设有第一行走轮的第一主框架、和底部设有第二行走轮的第二主框架,第一主框架下端在容置框上的投影落在容置框内,第二主框架下端在容置框上的投影落在容置框外,门排在长度方向上分前部与后部,第二主框架只分布于门排后部,门排在收缩时,门排前部的下端容置于容置框内。本发明实施方式能够使得整个伸缩门较为紧凑,体积较小。(The embodiment of the invention discloses a retractable door which comprises a machine head and a door row, wherein the door row can move back and forth under the driving of the machine head to expand or contract, an accommodating frame is arranged at the connecting side of the lower end of the machine head and the door row, the door row comprises a plurality of main frames with wheels, the main frames with wheels comprise a first main frame and a second main frame, the bottom of the first main frame is provided with a first travelling wheel, the bottom of the second main frame is provided with a second travelling wheel, the projection of the lower end of the first main frame on the accommodating frame falls in the accommodating frame, the projection of the lower end of the second main frame on the accommodating frame falls outside the accommodating frame, the door row is divided into a front part and a rear part in the length direction, the second main frame is only distributed at the rear part of the door row, and the lower end. The embodiment of the invention can ensure that the whole telescopic door is more compact and has smaller volume.)

1. A telescopic door is characterized by comprising a machine head and a door row, wherein the door row can move back and forth under the driving of the machine head to expand or contract, a containing frame is arranged at the connecting side of the lower end of the machine head and the door row, the door row comprises a plurality of main wheel frames with wheels, the main wheel frames with wheels comprise a first main frame with a first walking wheel at the bottom and a second main frame with a second walking wheel at the bottom, the projection of the lower end of the first main frame on the containing frame falls in the containing frame, the projection of the lower end of the second main frame on the containing frame falls outside the containing frame, the door row is divided into a front part and a rear part in the length direction, the second main frame is only distributed at the rear part of the door row, and the lower end of the front part of the door row is contained in the containing frame when the door row contracts.

2. The retractable door of claim 1, wherein the projection of the lower end of the first main frame on the accommodating frame falls within the accommodating frame specifically: the first travelling wheel is arranged on the outer side of the lower end of the first main frame, and the wheel track of the first travelling wheel is smaller than the width of the accommodating frame;

the projection of the lower end of the second main frame on the accommodating frame is specifically as follows: the second walking wheels are arranged on the outer side of the lower end of the second main frame, and the wheel track of the second walking wheels is larger than the width of the accommodating frame;

when the door row is contracted, the first travelling wheels are arranged on the inner side of the second travelling wheels.

3. The retractable door of claim 2, wherein the first road wheel is smaller than the second road wheel.

4. The retractable door of claim 2, wherein the head includes a rear wheel, and the track of the second road wheel is the same as and collinear with the track of the rear wheel.

5. The retractable door as claimed in claim 2, wherein the first main frame and the second main frame are correspondingly shaped frames, each of which comprises an upper cross bar, a lower cross bar and two side bars, and the two side bars of the second main frame are provided with outwardly extending ear seats at the outer sides of the lower ends thereof, and the second road wheels are mounted at the bottoms of the ear seats.

6. The retractable door of claim 1, wherein said head includes a rear wheel, and a display screen is provided on said head on a side perpendicular to an axis of said rear wheel, one end of said display screen extending outside said head, said display screen covering a portion of said row of doors when said row of doors is retracted.

7. The retractable door of any one of claims 1 to 6, wherein the door row further comprises at least one main frame without wheels, the main frame without wheels has a width smaller than that of the main frame with wheels, the main frame without wheels is disposed between two adjacent main frames with wheels, the main frame with wheels is provided with a first retracted position, the main frame without wheels is provided with a second retracted position corresponding to the first retracted position in shape and position, and when the door row is retracted, the main frame without wheels and the main frame with wheels are tightly attached to each other by the mutual fit of the first retracted position of the main frame with wheels and the second retracted position of the main frame with wheels.

8. The retractable door of any one of claims 1 to 6, wherein said door row further comprises cross links for connecting said plurality of wheeled main frames, said cross links having link depressions, the link depressions on adjacent cross links being oppositely oriented such that when a door row is retracted into position, the link depressions of adjacent cross links are brought into apposition with each other.

9. The retractable door of any one of claims 1 to 6, wherein said row of doors further comprises at least one sub-frame, said sub-frame having a width less than the width of said wheeled main frame;

the main frame comprises two side rods, openings are formed in the centers of the opposite sides of the two side rods, a cross rod between the two side rods is arranged on each opening, the auxiliary frame comprises two side rods, the two side rods are provided with concave auxiliary frame retraction positions, and the cross rod falls into the auxiliary frame retraction positions when the door row is retracted in place.

10. A retractable door as claimed in any one of claims 1 to 6, wherein said row of doors further comprises at least one sub-frame, the width of which is less than the width of the wheeled main frame, the sub-frame being a U-shaped frame formed by an upper cross bar and two side bars.

[ technical field ] A method for producing a semiconductor device

The invention relates to an electric retractable door, in particular to an electric retractable door structure which can enable a door row to retract and retract after the door row retracts, wherein the space occupation ratio is minimum.

[ background of the invention ]

At present, the electric retractable door is favored by people because of its flexibility, easy operation and changeable shape, and is widely applied to places such as offices, schools, enterprises, stadiums and the like, and can effectively manage vehicles and people who enter and exit. The traditional electric retractable door comprises a machine head and a retractable door row driven by the machine head, wherein the door row is formed by connecting a main frame, an auxiliary frame and cross connecting rods. The door row of traditional expansion gate is as wide as the aircraft nose, its main frame, vice frame and cross connecting rod increase and are simple superimposed structure for the length of door row after the shrink targets in place is longer, and under many circumstances, the setting of electronic expansion gate all can receive the restriction of place space and area, when electronic expansion gate shrink targets in place the back, show that the expansion gate is opened completely, this moment, if expansion gate length overlength, will crowd the width that the expansion gate opened, this is unreasonable to big city of little size of earth gold. Therefore, it is an objective requirement to develop an electric retractable door which can be retracted more tightly when the retractable door is opened, so as to have a sufficient opening width.

[ summary of the invention ]

The invention aims to solve the problems and provides a telescopic door, so that after a door row is contracted in place, the whole telescopic door is compact and small in size.

In order to achieve the purpose, the invention provides a retractable door which comprises a machine head and a door row, wherein the door row can move back and forth under the driving of the machine head to expand or contract, an accommodating frame is arranged at the connecting side of the lower end of the machine head and the door row, the door row comprises a plurality of main frames with wheels, the main frames with wheels comprise a first main frame with a first walking wheel at the bottom and a second main frame with a second walking wheel at the bottom, the projection of the lower end of the first main frame on the accommodating frame falls in the accommodating frame, the projection of the lower end of the second main frame on the accommodating frame falls outside the accommodating frame, the door row is divided into a front part and a rear part in the length direction, the second main frame is only distributed at the rear part of the door row, and when the door row contracts, the lower end of the front.

Wherein, the projection of first main frame lower extreme on the holding frame specifically does in the holding frame: the first travelling wheel is arranged on the outer side of the lower end of the first main frame, and the wheel track of the first travelling wheel is smaller than the width of the accommodating frame; the projection of the lower end of the second main frame on the containing frame is specifically as follows: the second walking wheels are arranged on the outer side of the lower end of the second main frame, and the wheel track of the second walking wheels is larger than the width of the accommodating frame; when the door row is contracted, the first travelling wheels are arranged at the inner side of the second travelling wheels.

Wherein the first road wheel is smaller than the second road wheel.

The machine head comprises a rear wheel, and the track of the second travelling wheel is the same as that of the rear wheel and is positioned on the same straight line.

Wherein, first main frame and second main frame are the corresponding frame of shape, all include horizontal pole, sheer pole and two side levers, and the lower extreme outside of two side levers of second main frame is equipped with the ear seat of outside extension, and the second walking wheel is equipped with to this ear seat bottom.

The aircraft nose includes the rear wheel, is equipped with the display screen with this rear wheel shaft vertically one side on the aircraft nose, and outside the aircraft nose was stretched out to the one end of this display screen, door row when contracting, this display screen covered partial door row.

Wherein, the door row still includes at least one no wheel main frame, the width of no wheel main frame is less than the width of wheeled main frame, no wheel main frame sets up between two adjacent wheeled main frames, be equipped with first position of contracting on the wheeled main frame, be equipped with on the no wheel main frame with the first shape of contracting the position and the corresponding second position of position contract, the door row is when contracting, through the first position of contracting of the main frame of having the wheel and the second of no wheel main frame contract mutually coincide for no wheel main frame and the mutual inseparable laminating of the main frame of having the wheel.

The door row also comprises cross connecting rods used for connecting the wheel main frames, the cross connecting rods are provided with connecting rod retraction positions, the connection rod retraction positions on the adjacent cross connecting rods are opposite in direction, so that the connection rod retraction positions of the adjacent cross connecting rods are mutually folded when the door row is retracted to the proper position.

The door row also comprises at least one subframe, and the width of the subframe is smaller than that of the main frame with wheels;

the main frame comprises two side rods, openings are formed in the centers of the opposite sides of the two side rods, a cross rod between the two side rods is arranged on each opening, the subframe comprises two side rods, the two side rods are provided with concave subframe retraction positions, and the cross rod falls into the subframe retraction positions when the door row is retracted in place.

The door row also comprises at least one subframe, the width of the subframe is smaller than that of the main frame with wheels, and the subframe is a U-shaped frame consisting of an upper cross rod and two side rods.

The present invention is directed to solve the above problems, and provides an electric retractable door structure capable of effectively reducing the space occupation ratio of the electric retractable door after being retracted, so that the members of the door row are engaged with each other through the retraction structure to form a retractable body engaged with each other, thereby saving the installation space of the electric retractable door to the maximum, and having both practicability and ornamental value.

In order to achieve the purpose, the invention provides an electric retractable door structure capable of enabling a door row to retract, which comprises a machine head and the door row, wherein the door row is formed by movably connecting a plurality of main frames, a plurality of auxiliary frames and a plurality of crossed connecting rods for connecting the main frames and the auxiliary frames, and is characterized in that a U-shaped containing frame for containing the front part of the door row is arranged at the connecting side of the lower end of the machine head and the door row, the bottom of the opening end of the containing frame is provided with a machine head rear wheel, the main frames comprise a plurality of first main frames with small walking wheels at the bottom, a plurality of second main frames with large walking wheels at the bottom and a non-wheel main frame, the wheel pitch of the large walking wheels is the same as that of the machine head rear wheel, the wheel pitch of the small walking wheels is smaller than that of the large walking wheels, the main frames, the auxiliary frames and the crossed connecting rods are provided with retracting structures when the door row retracts, and the plurality of second main frames, The main frame, the sub-frame and the cross connecting rods are mutually inosculated through the contraction structure, so that the main frame, the sub-frame and the cross connecting rods are mutually closely attached to form a whole with a small occupied space, at the moment, a plurality of large walking wheels of the second main frame are close to each other, and a plurality of small walking wheels of the first main frame are arranged on the inner sides of the large walking wheels in a staggered mode.

The machine head is a narrow machine head, the front end and the rear end of the bottom of the machine head are respectively provided with a machine head front wheel and a machine head rear wheel, one side of the machine head, which is vertical to wheel shafts of the machine head front wheel and the machine head rear wheel, is provided with a display screen, the display screen is connected with a main board arranged in the machine head, and one end of the display screen extends out of the machine head.

The first main frame is a rectangular frame consisting of a first upper cross rod, a first lower cross rod and two first side rods, the centers of the opposite sides of the two first side rods are provided with openings, the two sides of each opening are provided with inward-contracted horn-shaped first main frame retraction positions, and two ends of the bottom of the first main frame are provided with a pair of small walking wheels.

The second main frame is a rectangular frame consisting of a second upper cross bar, a second lower cross bar and two second side bars, the centers of the opposite sides of the two second side bars are provided with openings, the two sides of each opening are provided with inward-contracted horn-shaped second main frame retraction positions, the outer sides of the lower ends of the two second side bars of the second main frame are respectively provided with a frame-shaped ear seat, and the bottoms of the two ear seats are respectively provided with a large walking wheel.

The main frame without wheels is a rectangular frame consisting of a third upper cross bar, a third lower cross bar and two third side bars, the centers of the opposite sides of the two third side bars are provided with openings, the width of the main frame without wheels is smaller than that of the first main frame and the second main frame, and the outer sides of the two third side bars of the main frame without wheels are provided with main frame retraction positions corresponding to the shape and position of the first main frame retraction position of the first main frame and the second main frame retraction position of the second main frame.

The sub-frame is a U-shaped frame consisting of a fourth upper cross rod and two fourth side rods, the centers of the opposite sides of the two fourth side rods are provided with openings, the upper ends and the middle parts of the two fourth side rods are provided with concave arc-shaped sub-frame retraction positions, and the upper part and the lower part of the sub-frame are respectively fixed with a fixed rod connected with the cross connecting rod.

The cross connecting rods are divided into an upper group and a lower group, the middle parts of the cross connecting rods are respectively and rotatably connected to the fixed rods of the auxiliary frame, two ends of each cross connecting rod are respectively and rotatably sleeved on a first movable cross rod, a second movable cross rod or a third movable cross rod of the first main frame, the second main frame or the non-wheel main frame, which can slide up and down, and the inner sides of the cross connecting rods are provided with inwards-contracted convex connecting rod retraction positions.

The front section of the door row is arranged from front to back according to the first main frame, the subframe, the main frame without wheels, the subframe and the sequence of the first main frame, and the back section of the door row is arranged from back to front according to the sequence of the second main frame, the subframe, the main frame without wheels, the subframe, the first main frame, the subframe, the main frame without wheels, the subframe and the sequence of the second main frame, so that the door row is contracted through the first main frame, the second main frame, the main frame without wheels, the first main frame contraction position on the subframe and the cross connecting rod, the second main frame contraction position, the main frame without wheels, the subframe contraction position and the connecting rod contraction position, and the laminated structure which is tightly attached is formed.

The big walking wheels of the second main frame and the machine head rear wheels are positioned on the same straight line, when the door row is contracted, the big walking wheels and the machine head rear wheels are close to each other, and the small walking wheels positioned on the inner sides of the big walking wheels are close to each other.

The invention effectively solves the problem that the traditional electric retractable door has large space occupation ratio and overlong length after being retracted so as to influence the opening width of the retractable door. The invention sets the shrinking structure on each component of the door row, so that each component of the door row is mutually matched through the shrinking structure in the shrinking direction, namely, a part of the opposite sides of each frame of the adjacent door row is mutually embedded to form a compact shrinking body, thereby saving the setting field of the electric retractable door to the maximum extent and being more suitable for the occasion with limited field. Meanwhile, the small wheels are hidden inside the large wheels after the door row is contracted through the large wheel structure and the small wheel structure which are arranged in a staggered mode, so that the contracted door row is more compact and tidy, and the door row has higher practicability and ornamental value.

[ description of the drawings ]

Fig. 1 is a front side view of the door row of the present invention in an unfolded state.

Fig. 2 is an enlarged view of a portion a of fig. 1.

Fig. 3 is an enlarged view of a portion B of fig. 1.

Fig. 4 is a top view of fig. 1.

Fig. 5 is a side view of fig. 1.

Fig. 6 is a perspective view illustrating the door row of the present invention in an unfolded state.

Figure 7 is a front side view of the door row of the present invention retracted into position.

Fig. 8 is a top view of fig. 5.

Fig. 9 is an enlarged view of a portion C of fig. 8.

Fig. 10 is a view from direction a of fig. 7.

Fig. 11 is an enlarged view of a portion D of fig. 10.

Fig. 12 is a bottom view of fig. 7.

Fig. 13 is an enlarged view of a portion E of fig. 12.

Fig. 14 is a perspective view of the door row of the present invention in a retracted position.

[ detailed description ] embodiments

The following examples are further illustrative and explanatory of the present invention and are not to be construed as limiting the invention in any way.

Referring to fig. 1, 4, 5 and 6, the electric retractable door structure for retracting a door row according to the present invention includes a machine head 10, a door row 20 and a connecting block 30. The door row 20 can move back and forth under the driving of the machine head 10, so that the door row 20 is unfolded or contracted, and the opening or closing of the electric retractable door is realized.

As shown in fig. 1, 4, 5 and 6, the handpiece 10 is a traction mechanism of the door row, and in order to reduce the contracted length of the electric retractable door, in the present invention, the handpiece 10 is a narrow handpiece, and the width of the handpiece is smaller than that of the existing electric retractable door handpiece. The front end and the rear end of the bottom of the machine head 10 are respectively provided with a machine head front wheel 12 and a machine head rear wheel 13, and one side of the machine head, which is perpendicular to wheel shafts of the machine head front wheel 12 and the machine head rear wheel 13, namely the front side of the gate row is provided with a display screen 14 for displaying information such as license plate numbers, charging amounts and the like. The display 14 is connected to a main board (not shown) disposed in the handpiece, which may be any known main board carrying a retractable door control program. One end of the display screen 14 extends out of the handpiece. In order to make the contracted electric retractable door more tidy and beautiful, a U-shaped accommodating frame 11 is arranged at the connecting side of the lower end of the machine head 10 and the door row 20, the U-shaped accommodating frame can accommodate the front part of the door row 20 when the door row is contracted, and a machine head rear wheel 13 is arranged at the bottom of the opening end of the accommodating frame 11.

As shown in fig. 1 to 6, the door row 20 is formed by movably connecting a plurality of main frames 21, a plurality of sub-frames 22, and a plurality of cross links 23 connecting the main frames 21 and the sub-frames 22.

Specifically, as shown in fig. 6, the main frame 21 includes a first main frame 211, a second main frame 212, and a main frame 213 without wheels, wherein the first main frame 211 is a rectangular frame and is composed of a first upper cross bar 2111, a first lower cross bar 2112, and two first side bars 2113, and an opening 21131 is provided in the center of the opposite side of the two first side bars 2113, and the opening is used for allowing a first movable cross bar 2114 connected to a cross link to slide therein. As shown in fig. 9, the two sides of the opening 21131 are provided with first main frame retraction positions 211A, the first main frame retraction positions 211A inwardly retract the inner sides of the two first side bars 2113 to form a trumpet-shaped first main frame retraction position 211A, so that the retraction positions of the opposite end portions of the adjacent non-wheel main frame 213 can be matched with the retraction positions, thereby reducing the length of the two when retracted. A pair of small road wheels 2111 is arranged at two ends of the bottom of the first main frame.

As shown in fig. 6, the second main frame 212 is a rectangular frame corresponding to the shape of the first main frame 211, and a plurality of second main frames 212 are provided at intervals of the plurality of first main frames 211, the main frame 213 without wheels, and the sub-frame 22, and are formed by a second upper cross bar 2121, a second lower cross bar 2122, and two second side bars 2123, and an opening 21231 is provided at the center of the opposite sides of the two second side bars 2123 for allowing the second movable cross bar 2124 connected to the cross-link to slide therein. As shown in fig. 9, the opening 21231 is provided with inwardly-contracted second main frame recessions 212A at both sides thereof for matching with recessions at opposite end portions of the main frame 213 without wheels. In fig. 6, the two second side rods 2123 of the second main frame 212 are respectively provided with a frame-shaped ear seat 21232 extending outwards at the outer side of the lower end, and a large road wheel 2121 is respectively mounted at the bottom of each of the two ear seats 21232, and the track of the large road wheel 2121 is larger than the track of the small road wheel 2111.

As shown in fig. 6, the main frame 213 is a rectangular frame corresponding to the shape of the first main frame 211, and is composed of a third upper cross bar 2131, a third lower cross bar 2132, and two third side bars 2133. The opposite sides of the two third side bars 2133 of the main frame 213 without wheels are centrally provided with an opening 21331 for the third movable cross bar 2134 connected to the cross link to slide therein. The width of the main frame 213 is smaller than the width of the first main frame 211 and the second main frame 212. As shown in fig. 9, the two third side bars 2133 of the main frame 213 without wheels are provided with a main frame retraction 213A without wheels, and the main frame retraction 213A without wheels is in a trumpet shape corresponding to the shape and position of the first main frame retraction 211A of the first main frame and the second main frame retraction 212A of the second main frame, and is used for matching with the first main frame retraction 211A and the second main frame retraction 212A.

As shown in fig. 6, the sub-frame 22 is a U-shaped frame formed by the fourth upper cross bar 221 and two fourth side bars 223, and the centers of the opposite sides of the two fourth side bars 223 are provided with openings 2231. As shown in fig. 2 and 3, concave arc-shaped sub-frame retraction positions 22A are provided at the upper ends and the middle portions of the left and right sides of the two fourth side bars 223, so that the first movable cross bar 2114, the second movable cross bar 2124 or the third movable cross bar 2134 on the first main frame 211, the second main frame 212 or the wheel-less main frame 213 can fall into the sub-frame retraction positions 22A when the electric retractable door is retracted to a proper position, thereby reducing the length of the retracted retractable door. A fixing rod 224 for connecting the cross-links is fixed to each of the upper and lower portions of the sub-frame 22.

As shown in fig. 6, the cross links 23 are divided into two upper and lower groups 23A, 23B, the middle of each cross link 23 is rotatably connected to the fixing rod 224 of the subframe 22, two ends of each cross link 23 are rotatably sleeved on the first movable cross bar 2114, the second movable cross bar 2124 or the third movable cross bar 2134 of the first main frame 211, the second main frame 212 or the non-wheel main frame 213, and the first movable cross bar 2114, the second movable cross bar 2124 or the third movable cross bar 2134 can slide up and down. As shown in fig. 6 and 11, the inwardly contracted convex link retraction positions 23a1, 23B1 are provided on the inner side of each cross link 23, and the convex link retraction positions 23a1, 23B1 on the adjacent first main frame 211, second main frame 212 or wheel-less main frame 213 are oriented in opposite directions, so that when the adjacent cross links are retracted into position, the convex link retraction positions 23a1, 23B1 of the adjacent cross links are mutually involuted, thereby reducing the length of the door row when retracted into position.

As shown in fig. 8, 12 and 13, the large road wheels 2121 of the second main frame 212 and the head rear wheels 13 are aligned, and the small road wheels 2111 are located inside the large road wheels 2121, so that the components of the door row 20 are retracted into a compact whole by the large road wheels 2121 and the small road wheels 2111 which are retracted and dislocated. When the door row 20 is retracted to the proper position, the large road wheels 2121 and the machine head rear wheel 13 are close to each other, and the small road wheels 2111 located inside the large road wheels 2121 are close to each other and arranged in a compact and tidy structure as shown in fig. 14.

As shown in fig. 1, 4 and 6, in the present embodiment, the front section of the door row 20 is arranged in the order of the first main frame 211, the sub-frame 22, the main frame 213 without wheels, the sub-frame 22 and the first main frame 211 from front to back, and the rear section of the door row 20 is arranged in the order of the second main frame 212, the sub-frame 22, the main frame 213 without wheels, the sub-frame 22, the first main frame 211, the sub-frame 22, the main frame 213 without wheels, the sub-frame 22 and the second main frame 212 from back to front, but the arrangement is not limited thereto. In the above-described door row structure, the door row 20 is contracted by the first main frame 211, the second main frame 212, the main frame without wheels 213, the sub-frame 22, and the first main frame contraction position 211A, the second main frame contraction position 212A, the main frame contraction position without wheels 213A, the sub-frame contraction position 22A, and the link contraction positions 23A1, 23B1 on the cross link 23, so that a closely-adhered laminated structure as shown in fig. 14 is formed.

As shown in fig. 7 to 14, when the door row 20 is retracted, the main frames 21 and the sub-frames 22 at the front part of the door row are retracted into the receiving frame 11 at the lower end of the machine head 10, and the first main frame 211 or the second main frame 212 and the main frame 213 without wheels, the cross links 23, the sub-frame 22 and the first movable cross bar 2114, the second movable cross bar 2124 or the third movable cross bar 2134 are engaged with each other through the retraction structures 21A, 22A and 23A, so that the main frames 21, the sub-frames 22 and the cross links 23 are tightly engaged with each other to form a tight stacked body with a minimum volume and a minimum occupied space, thereby saving the installation space of the electric retractable door to the maximum extent. At this time, the large traveling wheels 2121 of the second main frame 212 are close to each other, and the small traveling wheels 2111 of the first main frame 211 are staggered and hidden inside the large traveling wheels 2121, so that the head 10, the main frame 21 and the large traveling wheels 2121 can be seen from the outside, and therefore, the structure is more compact after being contracted, the length is shorter, and the appearance is neater and more beautiful.

While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the invention.