DE212018000069U1 - Rotary mechanism of a child safety seat - Google Patents

Abstract

A rotating mechanism of a child safety seat, comprising a seat base (1) and a seat body (2) disposed on the seat base (1), characterized in that on a bottom surface of the seat body (2), a rotary plate (3) is provided in the circumferential direction is limited to the bottom surface of the seat body (2), wherein the seat body (2) through the rotary plate (3) on the seat base (1) is arranged, wherein the rotary plate (3) relative to the seat base (1) in the horizontal direction by 360 degrees can be rotated, wherein at the same time a selective positioning structure between the seat base (1) and the rotary plate (3) is provided, wherein the selective positioning structure, the seat body (2) relative to the seat base (1) in four directions from the front, back, left and right can position.

Description

Technical area

The present utility model relates to a child safety seat of an automobile, and more particularly to a child safety seat rotating mechanism capable of realizing a 360-degree rotation of a seat body relative to a seat base in a horizontal direction.

State of the art

The child safety seat of the car is a safety device that is specifically designed for children of different ages or different sizes and is installed in the car so that the driving safety of children can be effectively improved. In the event of a collision or a sudden deceleration of the vehicle, the shock effect on the child may be reduced, and the body movement of the child may also be limited to reduce the damage to it. The conventional child safety seat comprises a seat base, a seat body and a headrest, which is arranged at the upper end of the seat body. Currently, most child safety seats on the market are fastened to the car with seatbelt. For example, the Chinese patent has CN103507677A discloses a car safety seat structure with safety belt. In the installation method, the main drawback is that the installation is complicated. And many users, especially female users, can not master the installation or do the proper installation, which increases the damage to children to some extent. As an improvement, an ISOFIX interface on the car is also used to attach the child safety seat. That is, a set of ISOFIX interface and top tether is designed and added to the child safety seat to connect to the existing ISOFIX interface on the car accordingly. So it is cheaper to increase the reliability of the seat mounting on the car. And the installation is easier and more convenient.

To improve the ride comfort of the child safety seat, the seat body of many safety seats relative to the seat base can be set to a pitch angle (pitch angle). For example, the Chinese Utility Model "Child Safety Seat" with publication number discloses CN204605578U a safety seat in which the seat body can be adjusted to a tilt angle relative to the seat base.

With the further enhancement of child safety awareness, the child safety seat is suitable for reversing mounting so that the child lies down when the child is younger, and is suitable for normal mounting when the child is taller. If the change between the normal mounting and the reverse mounting must be carried out, the entire safety seat usually has to be removed and reinstalled, which is also very impractical. Children, especially babies, are younger and can not release the safety belt on the safety seat themselves. Even if they can loosen the seat belt, it is very impractical for children to get in and out due to the higher overall height of the safety seat. Thus, parental assistance is usually required. After boarding, the adult turns the body to put the child on the seat and then straps the seat belt. When disembarking, the adult also turns the body to touch the seat belt and then takes the child out of the safety seat. Since the space in the car is smaller, it is very impractical to turn the body in the Aoto and take the child. Especially when the child is heavier, the adult is more tired.

How to design a child safety seat that allows the adult outside the car to place the child on the safety seat is a technical problem to be considered by those skilled in the relevant art.

Content of the utility model

The technical problem to be solved by the present invention is to provide a rotating mechanism of a child safety seat which has a reasonably designed structure and can realize a 360-degree rotation of a seat body relative to a seat base in the horizontal direction. This rotating mechanism can also conveniently position the seat body relative to the seat base in four directions from the front, rear, left and right.

In order to solve the above technical problem, the present utility model employs the following technical solution: a child safety seat turning mechanism comprising a seat base and a seat body disposed on the seat base, characterized in that a rotary plate is provided on a bottom surface of the seat body so as to be circumferentially fixed to the seat base Bottom surface of the seat body is limited, wherein the seat body is arranged by the rotary plate on the seat base, and the rotary plate can be rotated relative to the seat base by 360 degrees in the horizontal direction; at the same time a selective positioning structure between the seat body and the rotary plate is provided, wherein the selective Positioning structure, the seat body relative to the seat base in four directions from the front, back, left and right position.

Preferably, an upper surface of the previous seat base is provided with a concave cavity for receiving the rotary plate, the seat base having a plurality of circumferentially spaced limiting hooks secured thereto, wherein a through hole is provided on the bottom surface of the concave cavity through which the limiting hook passes, and wherein a horizontal wall of the limit hook passes through the hole and thereafter exposed above the bottom surface of the concave cavity to form a clearance distance between the horizontal wall of the limit hook and the bottom surface of the concave cavity; wherein at the bottom of the inner peripheral wall of the rotary plate there is an inwardly extending annular limiting ring disposed within the confining distance. The horizontal wall in the limiting hook forms an upper and lower restriction for the limiting ring, the structure of this restriction being simple and easy to install.

Preferably, there are four limit hooks, with the bottoms of the two limit hooks in the seat base and are secured with outer sleeves in ISOFIX mounting tube set in the seat base and the bottoms of the other two limiting hooks in the seat base and are attached directly to the seat base.

Of course, the number of limit hooks can be set as needed and is not limited to four. The installation position can also be installed differently according to the specific seat base structure.

In order to facilitate the assembly, the previous seat base is formed by fitting the upper base and the lower base, and the bottom surface of the lower base is provided with a hole in which a cover plate for covering is provided, the cover plate being screwed to the underside the upper base is fastened, wherein the bottoms of the two limiting hooks fixed in the seat base are fastened to the cover plate.

As a further improvement, the prior concave cavity has a bulge, wherein the outer wall of the bulge is in contact with the inner peripheral surface of the limiting ring, wherein on the bulge a clamping jaw is fixed, the bottom surface of the clamping jaw directly touches the limiting ring to a vertical boundary for the To make boundary ring.

Preferably, the previous selective positioning structure comprises four circumferentially spaced detents disposed on the peripheral wall of the rotary plate, the front in the seat base defining a reciprocally slidable sliding grip, with a plug block mating with the detent connected to the inner end of the sliding handle is that can be inserted with the sliding of the sliding handle in the catch or released from it. And the outer end of the sliding handle is exposed from the top of the seat base to facilitate operation. The seat base is provided with a spring which acts on the sliding handle, so that the plug block on the sliding handle slides inwards and is inserted into the detent. The selective positioning structure has the advantages of simple structure and convenient operation. When changing position, it is only necessary to pull out the sliding handle to drive the plug block to release from the catch, then to rotate the seat body and to release the sliding handle. As the seat body rotates to the next angular position, the sliding handle, under the action of the spring pressure, drives the plug block to slide inward and engage in the detent. Thereby, a positioning of the rotary plate is realized in the circumferential direction. And then the rotary plate and the seat body can not be rotated 360 degrees relative to the seat base.

In order to facilitate the installation of the spring, the top of the previous seat base is provided with a receiving groove for receiving the spring, wherein a rear wall of the receiving groove is provided with a mounting column, wherein the plug block is provided with a guide hole through which passes through the mounting column movable wherein the spring encases the mounting column, with one end of the spring held on the plug block and the other end thereof held on the rear wall of the receiving groove.

The fact that the seat body can be adjusted to a pitch angle (pitch angle) relative to the seat base, it is further improved that arranged on the bottom surface of the previous seat body two right and left spaced and arcuate first locking plates are arranged, wherein on the lower part of the first Locking plate is provided a first positioning hole, wherein in the center of the first locking plate is provided along its width direction extending strip-shaped hole; in that the second locking plate is arranged close to the first locking plate and is located between the two first locking plates, wherein on the lower part of the second locking plate extending along its longitudinal direction Locking groove is provided, wherein the upper side of the locking groove are provided with a plurality of spaced apart along its longitudinal direction spaced locking teeth; in that the lower part of the seat body is provided with an adjusting handle which is slidable relative to the seat body, the adjusting handle having two rearwardly extending connecting arms, each connecting arm having a slot extending along its longitudinal direction and extending along its widthwise direction extending oblique hole is provided; a fixing rod having both ends thereof passing through the slot and the locking groove and thereafter inserted into a first positioning hole, and the fixing rod being slidable back and forth relative to the slot and the locking groove; wherein there is a locking bar, the two ends of which are respectively passed through the oblique hole and the locking groove and thereafter inserted in a strip-shaped hole, and wherein the locking bar is slidable relative to the locking groove, wherein the locking rod relative to the strip-shaped hole upwards and slidable downwards, wherein between the fixing rod and the adjustment handle a Ferder is provided, with which the adjustment handle can always be moved to the rear. And in the state in which the adjusting handle is in reverse, the adjusting handle forces the locking bar to be located in the top of the oblique hole, that is, that the locking bar is always inserted in the locking teeth. The structure is also suitable for adjusting the angle of inclination of the seat body. Upon adjustment, the handle is pulled outwardly, thereby forcing the latch bar to move down relative to the pitch hole. When the lock bar is at the bottom of the bevel, the lock bar is released from the lock tooth to release the seat body boundary. And then the seat body can be pushed back and forth and the seat body swings back and forth in a certain arc. After a correct position is set, the handle is released. And the handle is moved forward under the action of spring to force the latch rod to move upwardly relative to the sloped hole. And when the locking bar is at the top of the oblique hole, the locking bar is inserted into the locking tooth and the seat body is positioned relative to the seat base by the action of the fixing bar and the locking bar.

In order to make the movement of the seat body more stable relative to the seat base in the reciprocating direction, the upper part of the previous first lock plate is provided with an arcuate groove extending along its longitudinal direction, and the upper part of the second lock plate is provided with a second positioning hole. There is a guide bar whose two ends pass through the second positioning hole and thereafter are inserted into the arcuate groove, the guide bar being slidable along the arcuate groove.

As compared with the prior art, the present utility model has the advantages: In this structure, a rotating plate is adjusted, which causes the seat body to be rotated 360 degrees in the horizontal direction relative to the seat base. And at the same time a selective positioning structure between the seat base and the seat body is provided. And this selective positioning structure can position the seat body relative to the seat base in four directions from the front, rear, left and right. When boarding the seat body is rotated so that it faces the door direction (left or right) of the next page. Thus, the adult outside the car can put the child on the seat body and wear the seat belt and then the seat body is rotated to the front or rear position. When disembarking the seat body is also rotated so that it faces the door direction (left or right) of the next page. And the adult can also unbuckle the seat belt outside the car and take the child out of the car. Operation in the car is not required for the entire entry and exit process. And the design is very user friendly.

list of figures

• 1 a schematic perspective view of an embodiment of the present utility model;
• 2 a sectional view of an embodiment of the present utility model;
• 3 an enlarged view of point A in 2 ;
• 4 a schematic perspective view of a seat body in an embodiment of the present utility model;
• 5 a schematic perspective view in an embodiment of the present utility model, in which a rotary plate is disposed on a rotary body;
• 6 a schematic perspective view of a rotary plate in an embodiment of the present utility model;
• 7 a schematic perspective view in an embodiment of the present utility model, in which a Rotary plate is disposed on a first locking plate;
• 8th an exploded perspective view of 7 ;
• 9 a schematic perspective view in an embodiment of the present utility model, in which a rotary plate is arranged on a seat base;
• 10 an exploded perspective view of 9 ,

Concrete embodiments

The present utility model will be described below with reference to the embodiments of the drawings.

1 to 10 show a preferred embodiment of the present utility model.

A rotating mechanism of a child safety seat includes a seat base 1 and a seat body 2 on the seat base 1 is arranged. On a bottom surface of the seat body 2 is a turntable 3 provided in the circumferential direction on the bottom surface of the seat body 2 is limited, the seat body 2 is by rotary plate 3 on the seat base 1 arranged, and the rotary plate 3 can relative to the seat base 1 be rotated 360 degrees in the horizontal direction. At the same time, there is a selective positioning structure between the seat base 1 and the turntable 3 intended. The selective positioning structure may be the seat body 2 relative to the seat base 1 Position in four directions from the front, back, left and right.

As in the 2 . 3 . 9 . 10 shown is a top of the seat base 1 with a concave cavity 111 for receiving the rotary plate 3 provided, with the seat base 1 a plurality of limiting hooks arranged along the circumference 4 are attached, wherein on the bottom surface of the concave cavity 111 Through Hole 112 is provided by the limiting hooks 4 pass through, and wherein a horizontal wall of the Begrenzungshakens 4 through the hole 112 passes and then above the bottom surface of the concave cavity 111 is exposed to a limiting distance X between the horizontal wall of the limiting hook 4 and the bottom surface of the concave cavity 111 to build; wherein at the bottom of the inner peripheral wall of the rotary plate 3 an inwardly extending annular boundary ring 31 is present, which is arranged within the limiting distance X. There are four limit hooks 4 , where the bottoms of the two boundary hooks 4 in the seat base 1 located and with outer sleeves 10 in the ISOFIX mounting tube set in the seat base 1 are attached and the bottoms of the other two boundary hooks 4 in the seat base 1 lie and directly with the seat base 1 are attached. The seat base 1 is by matching connection of the upper base 11 and the lower base 12 formed, and the bottom surface of the lower base 12 is with a hole 121 provided in which a cover plate 13 is provided for covering, wherein the cover plate 13 by screw to underside of upper socket 11 is attached, with the bottoms of the seat base 1 attached two boundary hooks 4 on the cover plate 13 are attached. Within the concave cavity 111 there is a bulge 113 before, the outer wall of the bulge 113 with the inner peripheral surface of the restriction ring 31 being in contact, being at the bulge 113 a jaw 114 is attached, with the bottom surface of the jaw 114 the boundary ring 31 directly touched to a vertical boundary for the boundary ring 31 to build.

As in 2 . 3 . 10 As shown, the selective positioning structure includes four circumferentially spaced detents 32 attached to the peripheral wall of the rotary plate 3 are arranged, with the front in the seat base 1 a sliding handle 5 limited, which is slidable back and forth, wherein at the inner end of the sliding handle 5 one at the rest 32 matching plug-in block 51 connected to the sliding of the sliding handle 5 in the rest 32 plugged or can be solved from this. And the outer end of the sliding handle 5 is from the top of the seat base 1 exposed to facilitate operation. The seat base 1 is with a spring 52 provided on the sliding handle 5 acts, so the plug block 51 on the sliding handle 5 slides inwards and into the rest 32 is inserted.

The top of the seat base 1 is with a receiving groove 115 for receiving the spring 52 provided, wherein a rear wall of the receiving groove 115 with a mounting column 116 is provided, wherein the plug block 51 with a leadership hole 511 is provided, through which the mounting column 116 movable passes, the spring 52 the assembly column 116 encased, with one end of the spring 52 on the plug-in block 51 is held and the other end of it on the back wall of the receiving groove 115 is held.

As in the 5-8 Shown are two right and left spaced arranged and arcuate first locking plates 6 on the bottom surface of the seat body 2 arranged so that the seat body 2 relative to the seat base 1 can be adjusted to an inclination angle (pitch angle), wherein at the lower part of the first locking plate 6 a first positioning hole 61 is provided, wherein in the middle of the first locking plate 6 a extending along its width direction strip-shaped hole 62 is provided; that on the turntable 3 Right and left complained arranged and arcuate second locking plates 7 are arranged, wherein the second locking plate 7 close to the first locking plate 6 is arranged and located between the two first locking plates 6 is located, wherein on the lower part of the second locking plate 7 a locking groove extending along its longitudinal direction 71 is provided, wherein the top of the locking groove 71 with a plurality of spaced along their longitudinal direction spaced locking teeth 72 are provided; that the lower part of the seat body 2 with a setting handle 8th is provided, which is relative to the seat body 2 slidable back and forth, with the adjustment handle 8th two rearwardly extending connecting arms 81 having, each connecting arm 81 with a slot extending along its longitudinal direction 82 and a sloped hole extending along its width direction 83 is provided; being a fixation rod 9a is present, the two ends of each through the slot 82 and the locking groove 71 pass through and then into a first positioning hole 61 be plugged in, and where the fixation rod 9a relative to the slot 82 and the locking groove 71 slidable back and forth; being a locking bar 9b is present, whose two ends in each case through the oblique hole 83 and the locking groove 71 run through and then in the strip-shaped hole 62 be plugged in, and wherein the locking bar 9b relative to the locking groove 71 slidable back and forth, with the locking bar 9b relative to the strip-shaped hole 62 slidable up and down, being between the fixation rod 9a and the adjustment handle 8th a ferder 84 is provided with the adjusting handle 8th can be moved to the rear. And in the state in which the adjustment handle 8th is in reverse, forcing the adjustment handle 8th the locking bar 9b to, in the top of the oblique hole 83 to be located, ie that the locking bar 9b always in the locking teeth 72 can be inserted.

The top of the first locking plate 6 is with an arcuate groove extending along its longitudinal direction 63 provided, and the upper part of the second locking plate 7 is with a second positioning hole 73 Mistake. There is a guide rod 9c , whose two ends through the second positioning hole 73 go through and then into the arcuate groove 63 be plugged in, with the guide rod 9c along the arcuate groove 63 is slidable.

The working principle and the process of this turning mechanism are as follows:

Setting process of position changes: It is only necessary, the sliding handle 5 pull out to the plug block 51 to release from the rest 32 drive, then the seat body 2 to turn and the sliding handle 5 to solve. When the seat body 2 turns into the next angular position, drives the sliding handle 5 under the effect of the spring pressure (spring 52 ) the plug block 51 to slide inwards and get into the rest 32 insert. This will cause a positioning of the turntable 3 implemented in the circumferential direction. And then the turntable can 3 and the seat body 2 not 360 degrees relative to the seat base 1 to be turned around.

Tilt angle adjustment process: The setting handle becomes the setting handle 8th pulled outward, reducing the locking bar 9b is forced to move relative to the oblique hole 83 to move down. When the locking bar 9b at the bottom of the oblique hole 83 is located, the locking bar 9b from the locking tooth 72 solved the limitation for the seat body 2 to solve. And then the seat body can 2 pushed back and forth and the seat body 2 swings relative to the seat base 1 in a certain arc back and forth. After a correct position is set, the adjustment handle becomes 8th Approved. And the adjustment handle 8th is under the action of spring 84 moved forward, causing the locking bar 9b is forced to move relative to the oblique hole 83 to move upwards. And if the locking bar 9b at the top of the oblique hole 83 is located, the locking bar 9b into the locking tooth 72 plugged in and the seat body 2 is due to the effect of the fixation rod 9a and the locking bar 9b relative to the seat base 1 positioned. Although the preferred embodiment of the present invention is described in detail above, it should be understood that those skilled in the art can still use various modifications and variations to the present invention. Modifications made within the spirit and principles of the present invention, equivalent substitutions, improvements, etc., are intended to be included within the scope of the present utility model.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• CN 103507677 A [0002]
• CN 204605578 U [0003]

Claims (9)

A rotating mechanism of a child safety seat, comprising a seat base (1) and a seat body (2) disposed on the seat base (1), characterized in that on a bottom surface of the seat body (2), a rotary plate (3) is provided in the circumferential direction is limited to the bottom surface of the seat body (2), wherein the seat body (2) through the rotary plate (3) on the seat base (1) is arranged, wherein the rotary plate (3) relative to the seat base (1) in the horizontal direction by 360 degrees can be rotated, wherein at the same time a selective positioning structure between the seat base (1) and the rotary plate (3) is provided, wherein the selective positioning structure, the seat body (2) relative to the seat base (1) in four directions from the front, back, left and right can position. Rotary mechanism of a child safety seat after Claim 1 , characterized in that an upper side of the seat base (1) is provided with a concave cavity (111) for receiving the rotary plate (3), wherein on the seat base (1) a plurality of spaced along the circumference spaced boundary hooks (4) are attached, wherein the bottom surface of the concave cavity (111) is provided with a through hole (112) through which the limit hook (4) passes, and a horizontal wall of the limit hook (4) passes through the through hole (112) and then above the bottom surface of the concave cavity (FIG. 111) is exposed to form a clearance distance (X) between the horizontal wall of the limit hook (4) and the bottom surface of the concave cavity (111); wherein at the bottom of the inner peripheral wall of the rotary plate (3) there is an inwardly extending annular confining ring (31) disposed within the confining distance (X). Rotary mechanism of a child safety seat after Claim 2 , characterized in that there are four limiting hooks (4), wherein the bottoms of the two limiting hooks (4) in the seat base (1) and with outer sleeves (10) in the Isofix mounting tube set in the seat base (1) are fixed and the floors the other two boundary hooks (4) in the seat base (1) and are directly attached to the seat base (1). Rotary mechanism of a child safety seat after Claim 3 characterized in that the seat base (1) is formed by mating connection of the upper base (11) and the lower base (12), the bottom surface of the lower base (12) being provided with a hole (121) in which a Cover plate (13) is provided for covering, wherein the cover plate (13) by screw to the underside of the upper base (11) is fixed, wherein the bottoms of the seat base (1) fixed to the two limiting hooks (4) attached to the cover plate (13) are. Rotary mechanism of a child safety seat after Claim 2 characterized in that in the concave cavity (111) there is a bulge (113), wherein the outer wall of the bulge (113) with the inner peripheral surface of the delimiting ring (31) is in contact, wherein at the bulge (113) a clamping jaw (114 ), wherein the bottom surface of the clamping jaw (114) directly contacts the limiting ring (31) to form a vertical boundary for the limiting ring (31). Rotary mechanism of a child safety seat after Claim 1 characterized in that the selective positioning structure comprises four circumferentially spaced detents (32) disposed on the peripheral wall of the rotary plate (3), the front in the seat base (1) restricting a sliding gliding handle (5) , wherein at the inner end of the sliding handle (5) at the latch (32) matching plug block (51) is connected, which can be inserted with the sliding of the sliding handle (5) in the catch (32) or released therefrom, and the outer end of the sliding handle (5) being exposed from the top of the seat base (1) to facilitate operation, the seat base (1) being provided with a spring (52) acting on the sliding handle (5), so that the plug block (51) on the sliding handle (5) slides inwards and is inserted into the latch (32). Rotary mechanism of a child safety seat after Claim 1 , characterized in that the top of the seat base (1) is provided with a receiving groove (115) for receiving the spring (52), wherein a rear wall of the receiving groove (115) is provided with a mounting column (116), wherein the plug block (51 ) is provided with a guide hole (511) through which the mounting column (116) passes movably, wherein the spring (52) encases the mounting column (116), wherein one end of the spring (52) is held on the plug block (51) and the other end thereof is held on the rear wall of the receiving groove (115). Rotary mechanism of a child safety seat according to one of Claims 1 - 7 , characterized in that on the bottom surface of the seat body (2) has two right and left spaced arranged and arcuate first locking plates (6) are arranged, wherein at the lower part of the first locking plate (6) a first positioning hole (61) is provided, wherein in the middle of the first locking plate (6) extending along its width direction strip-shaped hole (62) is provided; in that right and left spaced and arcuate second locking plates (7) are arranged on the rotary plate (3), the second locking plate (7) being located close to the first locking plate (6) and being located between the two first locking plates (6) wherein a locking groove (71) extending along its longitudinal direction is provided on the lower part of the second locking plate (7), the upper side of the locking groove (71) being provided with a plurality of locking teeth (72) spaced along its longitudinal direction; in that the lower part of the seat body (2) is provided with an adjusting handle (8) which is slidable relative to the seat body (2), the adjusting handle (8) comprising two rearwardly extending connecting arms (81), each one Connecting arm (81) is provided with an elongated hole (82) extending along its longitudinal direction and an oblique hole (83) extending along its width direction; wherein there is provided a fixing bar (9a) both ends of which pass through the long hole (82) and the lock groove (71) and thereafter inserted into a first positioning hole (61), and the fixing bar (9a) is fixed relative to the long hole (82) ) and the lock groove (71) is slidable back and forth; wherein there is a locking bar (9b) whose two ends pass through each of the oblique hole (83) and the locking groove (71) and thereafter inserted in a strip-shaped hole (62), and wherein the locking bar (9b) is fixed relative to the locking groove (71 ) is slidable back and forth, wherein the locking rod (9b) is slidable upwards and downwards relative to the strip-shaped hole (62), wherein a ferder (84) is provided between the fixing rod (9a) and the adjusting handle (8), with which the adjustment handle (8) can always be moved backwards, wherein in the state in which the adjustment handle (8) is in reverse, the adjustment handle (8) forces the locking rod (9b) to move in the top of the oblique hole (9). 83), ie that the locking bar (9b) tends to always be inserted in the locking teeth (72). Rotary mechanism of a child safety seat after Claim 8 characterized in that the upper part of the first locking plate (6) is provided with an arcuate groove (63) extending along its longitudinal direction, and the upper part of the second locking plate (7) is provided with a second positioning hole (73) Guide rod (9c), the two ends of which pass through the second positioning hole (73) and thereafter inserted into the arcuate groove (63), wherein the guide rod (9c) along the arcuate groove (63) is slidable.

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