KR100437701B1 - buckle - Google Patents

Abstract

The present invention relates to a buckle configured to penetrate the side wall of the frame through the rocking stop of the control member, pivot the latch plate downward by rearward movement of the ejector, and support the ejector spring and the main spring on the latch plate and the frame bottom plate, respectively. According to the buckle of the present invention, the tongue does not fall out even if a high impact force is momentarily applied during the collision of the vehicle, so that the occupant of the vehicle can be reliably held.

Description

Buckle {buckle}

The present invention relates to a seat belt buckle provided in a seat of a vehicle, and more particularly, the tongue and latch plate when the tongue is inserted into the buckle without the tongue falling out of the latching protrusion of the latch plate during the collision of the vehicle. The fastening of the locking projections is securely made, and the number of parts is reduced to a buckle.

In general, the buckle is divided into a pressing button method and a sliding button method according to the method of pressing the release button.

The push button system is generally installed on the rear seat of the vehicle and releases the latch plate from the tongue by using a release button pressed in a direction perpendicular to the insertion direction of the tongue.

And, the sliding button method is usually installed on the front seat of the vehicle, and release the engagement between the latch plate and the tongue by using a release button sliding in the same horizontal direction as the insertion direction of the tongue.

A conventional buckle among these sliding button buckle is illustrated in FIG. 7. The buckle (A) into which the tongue (1) is inserted and removed is assembled by using the frame (4) as a reinforcing member, and the latch plate (6), the control member (7), and the release button (in the frame (4)) are assembled. 8), the ejector spring 9, the ejector 10, the main spring 11, and the spring support member 12 are provided.

The tongue 1 is normally provided with the belt insertion hole 2 in the wide end part, and is provided with the engagement hole 3 in the narrow tongue part part. The tongue 1 has its narrow tongue section inserted into or detached from the buckle A. FIG.

The frame 4 is a thick metal plate whose cross section is U-shaped by bending the side walls 4b and 4c at both sides of the bottom plate 4a.

A latch plate 6 is provided between the side walls 4b and 4c of the frame 4. The width W of the latch plate 6 is slightly smaller than the gap between the side walls 4b and 4c of the frame 4, and the latch hole 3 of the tongue 1 is located at the center of the lower surface of the latch plate 6. A locking projection 5 engaged in the protrusion protrudes downward. The latch plate 6 is provided between both side walls of the frame 4 so as to be rotatable between a position where the catching protrusion 5 is engaged with the tongue 1 and a position released from the tongue 1.

The upper surface of the latch plate 6 is fitted with a control member 7 which restricts rotation of the latch plate 6 by sliding relatively at a predetermined stroke distance. The control member 7 is slidably installed on the upper surface of the latch plate 6, but elastically contacts the release button 8 to prevent the latch plate 6 from moving upward and the latch plate ( Sliding displacement is possible between positions that allow upward movement of 6).

The release button 8 is received in the frame 4 to be parallel to the bottom plate 4a of the frame 4 and to be pressed elastically in the longitudinal direction of the frame 4.

The ejector 10 is slidably installed along the bottom plate 4a of the frame 4, and when the tongue 1 is released from the latch plate 6, the ejector spring 9 buckles the tongue 1 by the ejector spring 9. It acts in the direction of pushing out from (A).

The main spring 11 presses the release button 8 in the return direction, that is, the arrow U direction in FIG. 8, and also presses the control member 7 in the direction of preventing the upward movement of the latch plate 6. do.

The spring supporting member 12 is fitted to the frame 4 and supports the fixed end sides of the main spring 11 and the ejector spring 9.

The cover member 13 shown in phantom lines covers the above components.

In the bottom plate 4a of the frame 4, a guide hole 14 for guiding the ejector 10 along the insertion and disengagement directions of the tongue 1 is formed. The belt connecting hole 15 is formed behind the guide hole 14.

The latch plate 6 is provided with lateral extension portions 16, 16 'extending from both sides of the locking projection 5 to both sides, and both ends of the latch plate 6 facing the frame side walls 4b, 4c. On the inner surfaces of both side walls 4b and 4c of the frame 4, control projections 18 and 18 'are integrally protrudingly provided at a portion close to the insertion side of the tongue 1. Further, notches 17 and 17 'are provided at both ends of the lateral extension portions 16 and 16' so as not to be caught by the control protrusions 18 and 18 'of the frame 4 during the rotation operation of the latch plate 6. Formed. The width W of the lateral extensions 16, 16 ′ is a gap between the side walls 4b, 4c of the frame 4 so as to be rotatable between the side walls 4b, 4c of the frame 4. Slightly smaller than

On the other hand, at both ends of the control member 7, the notches 17 and 17 'of the latch plate 6 are closed to prevent the notches 17 and 17' from passing through the control protrusions 18 and 18, thereby latching the latch. Oscillation blocking portions 19 and 19 'are integrally provided to prevent the plate 6 from moving upward from the engagement position with the tongue 1 to the release position. In addition, the widths of the swing stops 19 and 19 'are spaced between the side walls 4b and 4c of the frame 4 so as to be able to slide and rotate between the side walls 4b and 4c of the frame 4. Slightly smaller than

Further, the main spring 11 is interposed between the frame 4 and the release button 8, which always pushes the release button 8 in the return direction and abuts against the control member 7 to prevent the swing stop 19, 19 'presses in the direction of closing the notches 17, 17'.

Furthermore, at a position spaced a little longer than the length of the swing stops 19 and 19 'to the rear of the control projections 18 and 18' from the inner surfaces of both side walls 4b and 4c of the frame 4, the control is controlled. When the member 7 moves toward the release side, the inclined cam protrusions 20, 20 'which position the control member 7 in a direction away from the frame bottom plate 4a are integrally provided. The inclined cam protrusions 20 and 20 'have an inclined surface B which abuts against the rear edges of the swing stops 19 and 19'.

On the other hand, support shafts 21 and 21 'are formed on both sides of the rear end of the latch plate 6 and are supported behind the inclined cam protrusions 20 and 20' on both side walls 4b and 4c of the frame 4. Supporting ends 22, 22 'are integrally provided to support the shafts 21, 21' rotatably. In addition, the guide pins 23 and 23 'of the rear end side of the release button 8 are inserted and guided above the inclined cam protrusions 20 and 20' on both side walls 4b and 4c of the frame 4. Guide holes 24 and 24 'are formed.

Fixing protrusions 25 and 25 'protrude from the side walls 4b and 4c that engage the notches 17 and 17' of the latch plate 6, and the fixing protrusions 25 and 25 'are formed of a latch plate ( 6) The load in the tension direction of the belt acting on 6) is distributed to the frame 4 and transmitted.

The recessed part 26 is formed in the front-end | tip of the control material 7 which is slidably installed in the upper surface of the latch plate 6, and the hook 28 is formed in the rear end of the control-material 7. Moreover, the T-shaped guide part 27 is formed in the front-end | tip of the latch board 6, and the rectangular hole 29 is formed in the rear end of the latch board 6. As shown in FIG.

The concave portion 26 of the control member 7 is passed through the lower portion of the horizontal arm of the T-shaped eyepiece portion 27 of the latch plate 6, and the hook 28 of the control member 7 is passed through the latch plate 6. By passing through the rectangular hole 29 of the abutment and abutting the lower surface of the latch plate 6, the control member 7 is inserted into and removed from the tongue 1 in a predetermined stroke range with respect to the latch board 6. It is assembled to be movable along. In addition, the front ends of the horizontal arms 30 and 30 'on both sides of the recess 26 are in contact with the abutting portion 8b of the rear surface of the pressing surface 8a of the release button 8, as shown in FIG. It is supposed to touch.

In addition, when the control member 7 abuts against the release button 8 and slides in the front-rear direction, the rock-stop portions 19 and 19 'at both ends move the notches 17 and 17' of the latch plate 6. Simultaneously opening and closing, a vertical arm 31 formed in the center portion is accommodated between a pair of spring receiving arms 32 and 32 'formed at the rear end of the release button 8.

In addition, in the operating relationship between the release button 8 and the control member 7 and the main spring 11, when the release button 8 is in the full return position forward, the tip of the main spring 11 is controlled. The control member 7 is pressed against the vertical arm 31 of the member 7 toward the front swing stop position. In addition, when the release button 8 is moved by the buckle release operation, the horizontal arms 30 and 30 'of the control member 7 abut against the contact portion 8b and move in the same direction, thereby compressing the control. The pressing force on the member 7 is released.

Controls 18 and 18 'of the side walls 4b and 4c are arched in accordance with the trajectories of the notches 17 and 17' when the latch plate 6 is rotated. The lower ends of the control projections 18 and 18 'are at a height capable of engaging with the upper surfaces of the swing stops 19 and 19' formed on both sides of the control member 7 in the engaged state of the latch plate 6.

The operation relationship of such a buckle of the prior art will be described with reference to Figs.

FIG. 8 shows a state before the tongue 1 is inserted into the buckle A. The latch plate 6 is rotatable about the support shafts 21 and 21 'in the direction of the arrow Y, and the ejector 10 ) Is located on the lower surface of the locking projection 5 to restrict the rotation of the latch plate 6 in the direction of arrow X. As shown in FIG.

At this time, the control member 7 is pressed by the main spring 11 to the tongue insertion opening side (arrow U direction), but the notches 17 and 17 of the latch plate 6. Since the control projections 18 and 18 'are accommodated in the') and the swing stops 19 and 19 'are in contact with the rear surfaces of the control projections 18 and 18', they are no longer moved forward and are stopped.

In this state, as shown in FIG. 9, when the tongue 1 is inserted into the buckle A, the ejector 10 is pushed back on the tip of the tongue 1 to retreat from the lower part of the locking projection 5. . Therefore, the latch plate 6 is rotated in the direction of arrow X with respect to the support shafts 21 and 21 'by the action of the main spring 11, so that the latching projection 5 is the locking hole 3 of the tongue 1. Hook the tongue (1) to the buckle (A).

At this time, the swing stop portions 19 and 19 'of the control member 7 move in the direction of the arrow U by the action of the main spring 11 in accordance with the displacement of the latch plate 6, Closing the upper openings of the notches 17, 17 ′ prevents the notches 17, 17 ′ of the latch plate 6 from passing through the control projections 18, 18 ′. As a result, the latch plate 6 is held downward while facing the upper surfaces of the swing stopping portions 19 and 19 'and the lower ends of the control projections 18 and 18', thereby preventing upward movement in the arrow Y direction. As a result, the engaging state 5 of the latch plate 6 and the tongue 1 are maintained.

Next, FIG. 10 shows a state when the tongue 1 is detached from the buckle A. When the pressing surface 8a of the release button 8 is pressed in the direction of the arrow V, the release button 8 is The main spring 11 is retracted while the main spring 11 is retracted to remove the pressing force of the main spring 11 against the control member 7, and the arm portions 30 and 30 'come into contact with the abutting portion 8b so that the control member ( 7) is located in the arrow V direction. At this time, the rocking stops 19 and 19 'are retracted behind the notches 17 and 17' of the latch plate 6 so that the notches 17 and 17 'pass through the control protrusions 18 and 18'. Makes it possible. Subsequently, when the release button 8 is further pressed, the control member 7 retreats so that the rear ends of the swing stops 19 and 19 'come into contact with the inclined surfaces B of the inclined cam protrusions 20 and 20'. Since the arrow Y direction moves upward, the latch plate 6 moves upward with the control member 7 to release the tongue 1 from the catching projection 5.

At this time, the ejector 10 releases the tongue 1 from the buckle A by the rising of the locking protrusion 5, and is located between the locking protrusion 5 and the frame base plate 4a. We prevent the meeting of (6). In addition, when the pressing force on the release button 8 is released, the ejector 10 abuts against the release button 8 to move the release button 8 to its original complete return position, thereby restoring the elastic position in the state of FIG. 8. Keep it.

However, such a conventional buckle is limited by protruding by pressing both side walls in integrally protruding the control protrusions 18 and 18 'on the inner surfaces of both side walls 4b and 4c of the frame 4. do. Further, in the engaged state of the tongue and the buckle, the rocking preventing portions 19 and 19 'of the control member 7 which abut against the lower ends of the control protrusions 18 and 18' to prevent upward rotation of the latch plate 6. The width of is set slightly smaller than the distance between the side walls 4b and 4c of the frame 4 in order to be able to slide and rotate between the side walls 4b and 4c of the frame 4. In other words, both ends of the oscillation blocking portions 19 and 19 'are set so as to be spaced apart from the side walls 4b and 4c of the frame 4 at predetermined intervals.

Therefore, when a high impact force acts instantaneously between the tongue and the buckle during a collision of the vehicle, a high impact force acts instantaneously on the control member 7. In particular, the impact force does not act in the longitudinal direction of the buckle. When inclined with respect to the direction, the control member 7 is biased to either side of the side walls 4b and 4c in the frame 4, whereby one end of the oscillation stoppers 19 and 19 'is framed. The control member 7 abuts against the lower ends of the control protrusions 18 and 18 'is spaced two times from either of the side walls 4b and 4c in (4) than the predetermined separation interval. 18 '), there is a problem of departure.

In addition, in the conventional buckle, the latch plate 6 is rotated downward only by gravity inertia by the weight of the latch plate 6 and the control member 7 when the tongue 1 is inserted into the buckle. There is a possibility that 5) is not securely caught in the locking hole 3 of the tongue 1.

In addition, the conventional buckle requires a spring support member 12, which is a plastic injection molding supporting the ejector spring 9 and the main spring 11, so that the number of parts is large, and the spring support member 12 is connected to the frame 4. Since there is a need to assemble in accordance with this there is a problem that also increases the number of assembly.

Accordingly, an object of the present invention is to allow the rocking stop of the control member to penetrate the side wall of the frame, rotate the latch plate downward by the rearward movement of the ejector, and support the ejector spring and the main spring on the latch plate and the frame bottom plate, respectively. To provide a configured buckle.

1 is an exploded perspective view of the buckle of the present invention,

2 is a rear view of the release button of the buckle of the present invention,

Figure 3 is a side cross-sectional view of the buckle of the present invention, a cross-sectional view of the state before the tongue is inserted into the buckle,

Figure 4 is a side cross-sectional view of the buckle of the present invention, a cross-sectional view of the tongue is inserted into the buckle and engaged to the engaging projection,

Figure 5 is a side cross-sectional view of the buckle of the present invention, a cross-sectional view of the tongue is released from the locking projection to be separated from the buckle,

6 is an exploded perspective view of a buckle of the prior art,

7 is a side cross-sectional view of a buckle of the prior art, a cross-sectional view of a state before the tongue is inserted into the buckle;

8 is a side cross-sectional view of the buckle of the prior art, a cross-sectional view of the tongue is inserted into the buckle and engaged to the engaging projection,

9 is a side cross-sectional view of the buckle of the prior art, in which the tongue is released from the locking projection and is a cross-sectional view of the state of being released from the buckle.

In order to achieve the above object, the buckle according to the present invention has a frame U in a cross-sectional U-shaped frame 4 in which a belt connecting hole 15 is formed in the bottom plate of the buckle for inserting and detaching the tongue 1. A latch plate 6 which is installed between both side walls 4b and 4c of the < RTI ID = 0.0 >), < / RTI > and is rotatable between a position where the locking projection 5 is engaged with the tongue 1 and a position released from the tongue 1 And a release button 8 that elastically slides by pressing in parallel with the bottom plate 4a of the frame 4, and is slidably installed on an upper surface of the latch plate 6, and the release button 8 A control member 7 which can be slidably displaced between a position where the latch plate 6 is prevented from moving upward and a position where the latch plate 6 is allowed to move upward, and a bottom plate of the frame 4 Slidably installed along 4a) and in the direction of extruding the tongue 1 from the buckle. In having a ejector 10 to be pressed buckle,

The swing stops 19 and 19 'of the control member 7 have a width larger than that of the frame 4,

On both side walls 4b and 4c of the frame 4, rocking stopper through holes 41 and 41 'for penetrating the rocking stops 19 and 19' of the control member 7 are formed. The swing blocking unit through the long hole (41, 41 ') is formed with an inclined hole 42 inclined at an angle upwards upward, the rear of the inclined hole (42) (19, 19') The inclined surface 42a at which the rear end of the abutment is formed,

In the center of the rear end of the latch plate 6, a pair of lower legs 51 and 51 'extending bent at right angles are integrally formed, and the lower legs 51 and 51' are formed at the lower end of the ejector 10. Is formed to abut the rear end of the

The ejector spring support end 43 is integrally formed at the rear of the guide hole 14 of the frame 4 so as to protrude forward, and the main spring is supported at the rear of the rectangular hole 29 of the latch plate 6. The end 53 is integrally formed so as to protrude forward, and the vertical arm 31 formed in the center portion of the control member 7 is bent at its rear end at a right angle.

EMBODIMENT OF THE INVENTION Hereinafter, the buckle of this invention is demonstrated, referring drawings.

1 to 3 show the buckle of the present invention. In the buckle 100 illustrated in FIGS. 1 to 3, the same reference numerals as those used in FIG. 7 will be used for the same components as those of the prior art. In addition, the description of the same components as those of the prior art will be omitted.

The buckle 100 of the present invention forms the width of the swing stops 19 and 19 'of the control member 7 larger than the width of the frame 4, and the side walls 4b and 4c of the frame 4 are formed. The rocking blockage through holes 41 and 41 'for penetrating the rocking block portions 19 and 19' of the control member 7 were formed. Inclined holes 42 and 42 'inclined at a predetermined angle in the rear upward direction are formed in the oscillation blocking portion through-holes 41 and 41', and the oscillation blocking portions (( Inclined surfaces 42a and 42a ', which the rear ends of 19, 19' abut, are formed.

Moreover, the buckle 100 of this invention integrally formed the pair of lower legs 51 and 51 'extended by bending at right angles in the center of the rear end of the latch plate 6. As shown in FIG. The lower legs 51 and 51 'are formed so that the lower end may contact the rear end of the ejector 10. As shown in FIG.

Moreover, the buckle 100 of this invention integrally forms the ejector spring support end 43 in the back of the guide hole 14 of the frame 4 so that it may protrude forward, and the rectangular hole of the latch plate 6 ( 29, the main spring support end 53 was integrally formed to protrude forward, and the end of the vertical arm 31 formed in the center of the control member 7 was bent at a right angle to the rear.

In addition, as a modified part of the present invention, in the present invention, the hinge shafts 55 and 55 'are formed on both sides of the rear end of the latch plate 6, and the stop shafts 56 and 55 are positioned at the front positions of the hinge shafts 55 and 55'. 56 ').

In order to correspond to the hinge shafts 55 and 55 'of the latch plate 6 and the stop shafts 56 and 56', the rear side of the inclined holes 20 and 20 'in both side walls 4b and 4c of the frame 4 is provided. And hinge grooves 45 and 45 'for rotatably supporting the hinge shafts 55 and 55' and stop grooves 46 and 46 'on which the stop shafts 56 and 56' are seated.

The release button 8 has sliding holders 61, 61 'extending on both rear sides thereof, and a straight groove 63, 63' having a predetermined length is formed in the middle of the inner side of the sliding holder 61, 61 '. It protrudes and is formed.

In addition, the guide rails 47 bent at right angles with respect to both side walls 4b and 4c in order to induce longitudinal sliding of the release button 8 in the first half of both side walls 4b and 4c of the frame 4. , 47 '). At the ends of the guide rails 47 and 47 ', release prevention jaws 47a and 47a' protruding outward are formed to prevent the release button 8 from being separated.

The straight grooves 63, 63 ′ of the release button 8 slide on the guide rails 47, 47 ′ of the frame 4. Since the straight grooves 63 and 63 'protrude inward from the inner surfaces of the sliding holders 61 and 61', when the release button 8 is assembled to the frame 4, the guide rails 47 and 47 'are mounted. The release preventing jaws 47a and 47a 'are caught by the ends of the straight grooves 63 and 63' so that the release button 8 does not fall out of the frame 4.

In addition, in the middle of the rear surface of the release button 8, as shown in FIG. 2, a pair of release protrusions 65, 65 having inclined surfaces which abut the front ends of the horizontal arms 30, 30 'of the control member 7. ') Is formed.

In the present invention, button springs 70 and 70 'are interposed between the leading ends of both side walls 4b and 4c of the frame 4 and the release button 8.

Tip protrusions 48 and 48 'for fitting button springs 70 and 70' are formed at upper ends of the side walls 4b and 4c of the frame 4, and release protrusions 65 and 65 'are formed. Spring mounting portions 67 and 67 'are formed on both sides of the frame 4 to fit the other ends of the button springs 70 and 70' whose one end is fitted to the tip projections 48 and 48 'of the frame 4. Moreover, the stop part 68 which restricts the upward rotation of the latch board 6 and the control part 7 is formed in the upper end of the back surface of the release button 40. As shown in FIG.

In addition, a pair bent at an inner right angle with respect to the side walls 4b and 4c for guiding the intermediate portions of the respective tips of the side walls 4b and 4c of the frame 4 while limiting the upward movement of the inserted tongue. Guide pieces 49 and 49 'are formed.

The operation of the buckle of the present invention will be described with reference to FIGS. 4 to 6.

Figure 4 shows the state before the tongue 1 is inserted into the buckle 100 of the present invention, the latch plate 6 is rotatable in the direction of the arrow Y around the hinge axis (55, 55 '), The ejector 10 is located on the lower surface of the locking projection 5 to restrict the rotation of the latch plate 6 in the direction of the arrow X. As shown in FIG.

At this time, the control member 7 is pressed by the main spring 11 to the tongue insertion opening side (arrow U direction), but the notches 17 and 17 of the latch plate 6. Since the control projections 18 and 18 'are accommodated in the') and the swing stops 19 and 19 'are in contact with the rear surfaces of the control projections 18 and 18', they are no longer moved forward and are stopped.

In this state, as shown in FIG. 5, when the tongue 1 is inserted into the buckle 100, the ejector 10 is pushed back on the tip of the tongue 1 to retreat from the lower part of the locking protrusion 5. . Therefore, the latch plate 6 is rotated in the direction of the arrow X about the hinge shafts 55 and 55 'by the action of the main spring 11, so that the locking projection 5 is the locking hole 3 of the tongue 1. Hook the tongue (1) to the buckle (100).

At this time, the swing stop portions 19 and 19 'of the control member 7 move in the direction of the arrow U by the action of the main spring 11 in accordance with the displacement of the latch plate 6, Closing the upper openings of the notches 17, 17 ′ prevents the notches 17, 17 ′ of the latch plate 6 from passing through the control projections 18, 18 ′.

In particular, the rocking stops 19 and 19 'of the control member 7 penetrate the rocking stops through holes 41 and 41' of the frame side walls 4b and 4c. Even if a high impact force acts instantaneously between the buckle, there is no fear that the swing stops 19 and 19 'will be separated from the swing stop penetration holes 41 and 41'.

Next, FIG. 6 shows a state when the tongue 1 is released from the buckle 100. When the pressing surface 8a of the release button 8 is pressed in the direction of the arrow V, the release button 8 is By retracting the main spring 11 while being retracted, the pressing force of the main spring 11 against the control member 7 is removed, and the arm portions 30 and 30 'and the release projections 65 and 65' come into contact with each other to control the result. The member 7 is located in the arrow V direction. At this time, the rocking stops 19 and 19 'are retracted behind the notches 17 and 17' of the latch plate 6 so that the notches 17 and 17 'pass through the control protrusions 18 and 18'. Makes it possible. Subsequently, when the release button 8 is further pressed, the control member 7 retreats so that the rear end of the oscillation stoppers 19, 19 'is inclined to the oscillation stopper through holes 41, 41' ( Since the inclined surfaces 42a and 42a 'of 42 and 42' move upward in the direction of the arrow Y, the latch plate 6 moves upward together with the control member 7 to latch the tongue 1. Release from (5).

At this time, the ejector 10 separates the tongue 1 from the buckle 100 by the rising of the locking protrusion 5, and is positioned between the locking protrusion 5 and the frame bottom plate 4a to latch the plate. We prevent the meeting of (6). In addition, when the pressing force on the release button 8 is released, the ejector 10 abuts against the release button 8 to move the release button 8 to its original complete return position, thereby restoring the elastic position in the state of FIG. 4. Keep it.

In addition, the buckle of the present invention, when the tongue (1) is inserted into the buckle, as shown in Figure 5, the ejector 10 is retracted, the rear end of the lower plate (51, 51 'of the latch plate 6). ), The latch plate 6 and the control member 7 are rotated downward about the hinge shafts 55 and 55 'by the principle of the lever, so that the latching projection 5 is the tongue (1). It is to be surely caught in the locking hole (3).

On the other hand, in the conventional buckle, the inner circumferential surface of the long hole described by the belt connecting hole 15 was smoothly finished. However, since the area of the inner circumferential surface of this hole is narrow, the surface pressure acting on the belt becomes high. Therefore, if a high tension is momentarily applied to the belt in contact with the long hole during the collision of the vehicle, the high surface pressure with the inner circumferential surface of the long hole There is a problem that is cut.

In the frame 4 of the present invention, the first long part 15a and the second long part 15b and the first long part 15a and the second long part 15b that face the first long part 15a are provided. The first protrusions 71 protruding rounded corners from one side of the steel sheet were formed on the inner circumferential surface of the long hole 15 formed of arc-shaped short edges 15c and 15d, in which the portions to be connected are smoothly connected. Since the long hole 15 is formed with the width | variety of the inner peripheral surface thick by the 1st protrusion part 71, the area of the 1st long edge part 15a which a belt abuts is wide. The first protrusion 71 protrudes from one side by burring or drawing from the other side of the steel plate to one side, and at the same time, the belt is inverted with respect to the first long portion 15a. The corner is rounded. In FIG. 1, for convenience of illustration, the first protrusion 71 protrudes upward of the steel plate, but it will be appreciated that the first protrusion 71 may protrude downward of the steel plate.

Therefore, according to the present invention, since the surface pressure acting on the belt in the first long portion 15a can be sufficiently reduced, it is possible to prevent the belt from being cut even if a high tension is momentarily applied to the belt during the collision of the vehicle.

In general, the long hole is an elliptical shape in which the first and second long edges are all formed in a straight line shape, or a half moon shape in which only the second long edge is curved to facilitate the insertion of the belt, but both the first and second long edges are curved. It can also be formed. In this invention, the 1st long edge part 15a by which a belt is wound among the inner peripheral surfaces of the long hole 15 is formed so that it may protrude toward the center part from the both ends of the longitudinal direction, and is opposed to the 1st long edge part 15a. The long edge part 15b is also formed along the 1st long edge part 15a.

Since the center portion of the first long portion 15a is curved to protrude in a direction opposite to the tension from the belt, the first long portion 15a is not concavely deformed along the direction of action of the tension. Thus, the belt is always kept at the normal width without the belt gathering on the first long edge portion 15a. As a result, the tension of the belt is always uniformly distributed on the first long portion 15a.

In addition, since the second long portion 15b is curved like the first long portion 15a, the second long portion 15b is inserted into the long hole 15 while bending the belt to be bent along its central line in the longitudinal direction to maintain the flat state of the belt. In this case, the shape of the first long edge portion 15a and the second long edge portion 15b substantially matches the curved shape of the belt. Thus, the belt is easily inserted into the long hole 15.

In addition, although the protrusion part was formed over the whole inner peripheral surface of a long hole in the above, you may form a protrusion part only in a part of the inner peripheral surface of a long hole. That is, the protruding portion may be formed only on the first long edge portion 15a of the long hole 15, and the protruding portion may be formed only on the first long edge portion 15a and the first and second short edge portions 15c and 15d of the long hole 15. It may be formed.

In addition, although the protrusion part was formed in the long hole in which both the 1st and 2nd long edge part was formed in the curve above, the protrusion part was formed in the long hole in which both the 1st and 2nd long edge part were formed linearly, or only the 2nd long edge part was It can be seen that the protrusion formed in the curved long hole is included in the scope of the present invention.

The above embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the above description.

According to the buckle of the present invention, the tongue does not fall out even when a high impact force is momentarily applied during the collision of the vehicle, so that the occupant of the vehicle can be reliably held.

Further, according to the buckle of the present invention, when the tongue is inserted into the buckle, the engaging projection of the tongue and the latch plate can be made sure.

In addition, according to the buckle of the present invention, there is no need to provide a spring support member that is a separate plastic injection molding, it is possible to reduce the manufacturing cost.

Claims (3)

The belt connecting hole 15 of the buckle for inserting and removing the tongue 1 is provided in the cross-sectional U-shaped frame 4 formed in the bottom plate, between the side walls 4b and 4c of the frame 4, Pressing in parallel with the bottom plate 4a of the frame 4 and the latch plate 6 rotatable between the position where the machine 5 is engaged with the tongue 1 and the position released from the tongue 1. And a release button 8 which slides elastically so as to be relatively slidable on an upper surface of the latch plate 6, and which contacts the release button 8 to prevent upward movement of the latch plate 6. A control member 7 which is slidably displaceable between a position and a position allowing upward movement of the latch plate 6, and is slidably installed along the bottom plate 4a of the frame 4, and the tongue 1 In the buckle provided with the ejector 10 is pressed in the direction of extruding from the buckle, The swing stops 19 and 19 'of the control member 7 have a width larger than that of the frame 4, On both side walls 4b and 4c of the frame 4, rocking stopper through holes 41 and 41 'for penetrating the rocking stops 19 and 19' of the control member 7 are formed. The swing blocking unit through the long hole (41, 41 ') is formed with an inclined hole 42 inclined at an angle upwards upward, the rear of the inclined hole (42) (19, 19') The inclined surface 42a at which the rear end of the abutment is formed, In the center of the rear end of the latch plate 6, a pair of lower legs 51 and 51 'extending bent at right angles are integrally formed, and the lower legs 51 and 51' are formed at the lower end of the ejector 10. Is formed to abut the rear end of the The ejector spring support end 43 is integrally formed at the rear of the guide hole 14 of the frame 4 so as to protrude forward, and the main spring is supported at the rear of the rectangular hole 29 of the latch plate 6. Buckle, characterized in that the end (53) is integrally formed so as to protrude forward, the vertical arm (31) formed in the central portion of the control member (7) is bent at its rear end at a right angle. According to claim 1, The inner circumferential surface of the long hole 15 is formed with a first protrusion 71 having a corner protruding round from one side of the steel sheet, the first long edge portion 15a of which the connecting belt is wound among the inner circumferential surface of the long hole 15. A buckle, which is formed to protrude from the both ends in the longitudinal direction toward the center portion, and the second long portion 15b facing the first long portion 15a is formed to follow the first long portion 15a. . According to claim 1, Sliding holders 61 and 61 'are formed on both sides of the rear side of the release button 8, and in the middle of the inner surface of the sliding holders 61 and 61', straight grooves 63 and 63 'of a predetermined length are formed. It is formed to protrude, and in the first half of both side walls 4b and 4c of the frame 4, in order to induce longitudinal sliding of the release button 8, it is perpendicular to the outer side walls 4b and 4c. Guide rails 47 and 47 'bent in the shape of the guide rails, and at the front ends of the guide rails 47 and 47', in order to prevent the release of the release button 8, the separation prevention protrusions 47a, 47a '), and a pair of release projections 65, 65' having an inclined surface in the middle of the rear surface of the release button 8, which is in contact with the distal end of the horizontal arms 30, 30 'of the control member 7. ) Is formed, and button springs 70 and 70 'are opened between the front end portions of both side walls 4b and 4c of the frame 4 and the release button 8. At the upper end of each of the side walls 4b and 4c of the frame 4, tip protrusions 48 and 48 'for fitting button springs 70 and 70' are formed, and the release protrusions ( On both sides of the 65 and 65 ', spring seating portions 67 and 67' are formed for fitting the other ends of the button springs 70 and 70 ', one end of which is fitted to the tip projections 48 and 48' of the frame 4, respectively. In the middle portion of each tip of each of the side walls 4b and 4c of the frame 4, it is bent at an inner right angle with respect to the side walls 4b and 4c for guiding while limiting the upward movement of the inserted tongue. Buckle characterized in that a pair of guide pieces (49, 49 ') are formed.