Spring bolt

Abstract

The lock tongue comprises a tongue piece main body which is provided with a first insertion hole and a second insertion hole through which the webbing is inserted, and a tongue plate which is detachably connected and fixed to the buckle; a lock member supported so as to be displaceable between a release position where the lock member is separated from the first insertion hole and the webbing can be moved, and a lock position where the lock member is close to the first insertion hole and the webbing is prevented from moving; and a guide member which is assembled on the locking member and restricts the position of the webbing passing through relative to the locking member. According to the spring bolt of the structure, the position where a braid passes through is limited through the guiding piece, and the braid can be prevented from making contact with the inner wall of the tongue piece body.

Description

Technical Field

[0001] The present invention relates to a tongue that is detachably and securely connected to a buckle of a seat belt device. Background Art

[0002] In vehicles such as automobiles, a three-point seat belt device for protecting occupants is known. When the tongue is properly latched to the buckle, the three-point seat belt device protects the occupant by means of a webbing that passes through the chest and waist of the occupant sitting on the seat. Specifically, in the event of a collision, the webbing is fixed by a locking mechanism to prevent it from being pulled out, thereby restraining the occupant in the seat for protection. As a tongue having such a locking mechanism, it is known that by displacing a locking member within the tongue body, the inserted webbing can be placed in a released state or a locked state (for example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Document 1: International Publication No. 2013 / 099590 Summary of the Invention

[0005] Problems to be Solved by the Invention

[0006] Each time an occupant gets into the vehicle, when the tongue is latched into the buckle and when the tongue is unlatched from the buckle, the webbing is often pulled relative to the tongue in an inclined direction. When the webbing is pulled obliquely relative to the locking body, the webbing slides on the locking member and biases to one side, causing it to be pressed against an unexpected part of the tongue body, and the resulting friction causes the webbing fibers to fuzz. This fuzzing, for example, makes the surface become mottled white, thereby impairing the appearance.

[0007] The present invention has been made to solve the above problems, and an object thereof is to provide a tongue such that even when the webbing passed through the tongue body is pulled out obliquely, the surface of the webbing does not become rough due to friction with the inner wall of the tongue body.

[0008] Means for Solving the Problems

[0009] The tongue in a specific embodiment of the present invention includes: a tongue body having a first insertion hole and a second insertion hole for inserting the webbing, and a tongue plate for detachably and securely connecting to the buckle; a locking member supported to be displaceable between a release position where it moves away from the first insertion hole and allows the webbing to move, and a locking position where it approaches the first insertion hole and obstructs the movement of the webbing; and a guide member assembled on the locking member to restrict the position where the webbing passes relative to the locking member.

[0010] Effects of the Invention

[0011] According to the present invention, a tongue can be provided such that even if a webbing passing through the tongue body is pulled out obliquely, the surface of the webbing will not become rough due to friction with the inner wall of the tongue body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a perspective view showing a schematic diagram of a seat belt device according to the present embodiment.

[0013] Figure 2 is a perspective view showing the state in which the tongue is connected and fixed to the buckle.

[0014] Figure 3 are a front perspective view and a rear perspective view of the tongue.

[0015] Figure 4 is an exploded perspective view showing the main elements of the tongue.

[0016] Figure 5 are a front perspective view and a rear perspective view of the guide member.

[0017] Figure 6 is a sectional view taken along the line a-a of the guide member.

[0018] Figure 7 is a sectional view taken along the line b-b of the guide member including the surrounding elements.

[0019] Figure 8 is a sectional view taken along the line c-c of the guide member including the surrounding elements.

[0020] Figure 9 are a longitudinal sectional view showing the tongue in the released state and a longitudinal sectional view showing the tongue in the locked state.

[0021] Figure 10 is a sectional view taken along the line a-a of the guide member according to a modified example. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, structures having the same reference numerals have the same or similar structures. In addition, in each figure, when there are a plurality of structures having the same or similar structures, in order to avoid complication, symbols may be given to some of them, and the same symbols may be omitted for the other parts.

[0023] Figure 1It is a perspective view showing a schematic diagram of the seat belt device 10 according to the present embodiment. The seat belt device 10 mainly includes a tongue 100, a retractor 200, a webbing 300, a waist anchor 400, a shoulder anchor 500, and a buckle 600. The retractor 200 is mounted on the floor on one side with respect to a vehicle seat (not shown). The retractor 200 includes an inertia reel having a biasing spring inside, and winds and houses one end of the webbing 300.

[0024] The webbing 300 pulled out from the retractor 200 is divided into three sections, namely a shoulder belt 310, a waist belt 320, and a vertical belt 330. The shoulder belt 310 is the part of the webbing 300 that is deflected by the shoulder anchor 500 and obliquely hangs on the occupant's chest. The waist belt 320 is the part of the webbing 300 that horizontally hangs on the occupant's waist, and its end is clamped by the waist anchor 400 and, like the retractor 200, is fixed to the floor on one side with respect to the vehicle seat. The vertical belt 330 is the part of the webbing 300 that is substantially vertically pulled upward from the retractor 200 and inserted into the shoulder anchor 500.

[0025] The tongue 100 is slidably inserted through the contact of the webbing 300 and is divided into a shoulder belt 310 part and a waist belt 320 part before and after it. The tongue 100 is detachably connected and fixed to the buckle 600, and the buckle 600 is provided on the side opposite to the retractor 200 with respect to the seat.

[0026] Figure 2 It is a perspective view showing the state where the tongue 100 is connected and fixed to the buckle 600. And, in order to make a part of the internal structure of the tongue 100 visible, the state where a lid described later is removed is shown.

[0027] As shown in the figure, the webbing 300 is inserted through the shoulder-side insertion hole 111 of the tongue body 110, folded back inside the tongue body 110, and pulled out from the waist-side insertion hole 112 (it can also be in the reverse direction). The part of the webbing 300 inserted up to the shoulder-side insertion hole 111 as the first insertion hole functions as the shoulder belt 310, and the part pulled out from the waist-side insertion hole 112 as the second insertion hole functions as the waist belt 320. The passing position of the webbing 300 in the width direction inside the tongue body 110 is restricted by a guide 120 inside the tongue body 110. Specific details will be described later.

[0028] The tongue 100 has a tongue plate 150 fixed to the tongue body 110. When the tongue plate 150 is inserted into the buckle 600, it is connected and fixed by a connection and fixing mechanism provided inside the buckle 600. And when the button 610 is pressed, the connection and fixing is released, and the tongue 100 is released from the buckle 600.

[0029] Figure 3 It is a front perspective view of the tongue (Figure 3 (A)) and rear perspective view ( Figure 3 (B)). Further, in the rear perspective view, in order to make a part of the internal structure of the tongue 100 visible, a state where the lid described later is removed is shown.

[0030] The tongue body 110 is formed of molded resin and is provided with a shoulder side insertion hole 111 and a waist side insertion hole 112 for inserting and passing through the webbing 300 corresponding to the cross-sectional shape of the webbing 300. The tongue plate 150 is formed of a metal plate and is integrally formed with the tongue body 110 by, for example, two-color molding. An opening 151 is provided in the tongue plate 150, and the opening 151 is connected and fixed to the connection and fixing mechanism of the buckle 600.

[0031] Inside the tongue body 110, a guide member 120 and a locking member 130 used in combination with each other are housed. Details will be described later, and they are housed so as to be integrally displaceable between a release position where the webbing 300 can move away from the shoulder side insertion hole 111 and a locking position where the webbing 300 is prevented from moving and obstructed by approaching the shoulder side insertion hole 111.

[0032] Figure 4 is an exploded perspective view showing the main elements of the tongue 100. The tongue 100 mainly includes a tongue body 110, a tongue plate 150, a locking member 130, a biasing spring 140, a guide member 120, and a lid 160. The tongue body 110 is integrally formed in a partial cylindrical shape with a substantially U-shaped cross section having a central axis in the width direction. A guide surface 113, which is a part of its inner surface, contacts the outer surface 130a of the locking member 130 to support the locking member 130 and guide its displacement along the inner surface.

[0033] The locking member 130 is formed by bending a metal plate stamped into a predetermined shape, and is mainly composed of an outer surface 130a along the guide surface 113 and bent portions 130b bent respectively from two sides in the long side direction of the outer surface 130a. The biasing spring 140 is a spring member formed by bending the middle portion into a linear shape. The biasing spring 140 is housed inside the locking member 130, and both ends thereof extend from the locking member 130 and are fixed to a spring support portion 114 provided on the tongue body 110. The locking member 130 is normally located at a release position away from the shoulder side insertion hole 111 under the action of the biasing spring 140.

[0034] The guide member 120 is formed of molded resin and is mounted on the locking member 130 by embedding. Details will be described later. The guide member 120 restricts the position where the webbing 300 passes relative to the locking member 130. The lid 160 is formed of molded resin, covers the partially cylindrical opening of the tongue body 110, and protects the locking member 130 and the like disposed inside the tongue body 110.

[0035] Figure 5 is a front perspective view of the guide member 120 ( Figure 5 (A)) and a rear perspective view ( Figure 5 (B)). The guide member 120 mainly has a substantially plate-shaped planar portion 121 whose width is wider than the width of the webbing 300, and side wall portions 122 provided at both end portions of the planar portion 121, and is integrally formed in an H shape. The surface 121a of the planar portion 121 is a surface that comes into contact with and slides in contact with the wide surface of the webbing 300. The back surface 121b of the planar portion 121 is a surface on the opposite side of the surface 121a, and is a surface facing the locking member 130, which is the object to be assembled.

[0036] Near the center in the long side direction of the back surface 121b, that is, near the end portion in the short side direction, a guide protrusion 124 that protrudes and extends from the back surface 121b is provided. When the guide member 120 is mounted to the locking member 130, the guide protrusion 124 functions to contact a part of the locking member 130 and guide the guide member 120 to a predetermined position. In addition, on one side surface in the long side direction, that is, the side surface 121c, a plurality of semi-cylindrical anti-collision ribs 127 extending in the thickness direction of the planar portion 121 are provided along the long side direction. The anti-collision ribs 127 are pressed in contact with at least a part of the fitting surface fitted to the locking member 130, thereby ensuring that the guide member 120 is assembled to the locking member 130 without looseness.

[0037] The side wall portions 122 are provided to stand up from both end portions of the planar portion 121 respectively, and function to restrict the movement of the webbing 300 that contacts and slides on the planar portion 121 in the width direction. The protruding portions 123 are provided to protrude from the respective side wall portions 122 and face each other, and function to restrict the distance between the webbing 300 and the planar portion 121 from exceeding a predetermined distance. The engaging members 125 are provided on the rear surface side of the planar portion 121 and protrude from both end portions in the long side direction respectively. The engaging members 125 are connected and fixed to the bent portion 130b of the locking member 130, making it easy to assemble the guide member 120 to the locking member 130. The guide cover 126 has a curved surface that is respectively provided on each side wall portion 122 and is continuous with a part of the outer curved surface 130a of the locking member 130 when the guide member 120 is assembled to the locking member 130.

[0038] Figure 6 is along Figure 5Cross-sectional view of the guide member 120 taken along line a-a in (A). However, a cross-section of the webbing 300 that contacts and slides on the flat portion 121 is also shown.

[0039] As described above, the guide member 120 restricts the movement of the webbing 300 that contacts and slides on the flat portion 121 in the width direction by the side wall portion 122. In the present embodiment, when the width of the webbing 300 is BW (mm) and the distance between the side wall surfaces 122a of the side wall portion 122 is GW1 (mm), it is designed to satisfy GW1 ≥ BW + 1.0. By providing a margin of approximately 1.0 mm in the width direction as described above, the webbing 300 can be easily and smoothly fed out during normal use. In the present embodiment, when the distance between the front end portions of the opposing protruding portions 123 is GW2 (mm), it is designed to satisfy BW - 3.0 ≥ GW2. By protruding the protruding portions 123 as described above, the webbing 300 is prevented from detaching from the guide member 120 during use.

[0040] In addition, in the present embodiment, when the thickness of the webbing 300 is BT (mm) and the height from the surface 121a of the flat portion 121 to the protruding bottom surface 123a of the protruding portion 123 is GH (mm), it is designed to satisfy BT × 2.5 > GH ≥ BT × 1.2. By restricting the height of GH as described above, the webbing 300 can be easily inserted into the guide member 120 during manufacturing, and the webbing 300 can be prevented from bending even when it is deflected to one side during use.

[0041] Figure 7 is along Figure 5 Cross-sectional view of the guide member 120 taken along line b-b in (A). However, a cross-section of the locking member 130 and a partial cross-section of the guide surface 113 of the tongue main body 110 are also shown in a state where the guide member 120 is assembled to the locking member 130 and housed inside the tongue main body 110.

[0042] The guide member 120 and the locking member 130 are housed inside the tongue main body 110 and can rotate and displace along the guide surface 113. At this time, the cover surface 126a of the guide cover 126 provided on the guide member 120 is continuous with the outer curved surface 130a of the locking member 130, and when the guide member 120 and the locking member 130 are displaced integrally, they smoothly contact the guide surface 113. Therefore, the guide member 120 and the locking member 130 can stably displace between the release position and the locking position inside the tongue main body 110.

[0043] Figure 8 is along Figure 5 Cross-sectional view of the guide member 120 taken along line c-c in (A). However, a cross-section of the locking member 130 in a state where the guide member 120 is assembled to the locking member 130 is also shown.

[0044] When assembling the guide member 120 to the locking member 130, first, the engaging member 125 is fixedly connected to one side (the left side in the figure) of the bent portion 130b. Next, the front end of the guide protrusion 124 is pressed against the other bent portion 130b (the right side in the figure), and the flat portion 121 is directly pressed in, causing the guide protrusion 124 to contact and slide relative to the bent portion 130b. When pressed in to a certain extent, the anti-collision rib 127 contacts the bent portion 130b, and when the flat portion 121 is further pressed in, the anti-collision rib 127 is flattened, and the guide member 120 is firmly assembled to the locking member 130. When assembled as described above, the position of the webbing 300 moving on the flat portion 121 is restricted by the locking member 130. That is, even if the webbing 300 is pulled out obliquely, it will not contact the side surface of the locking member 130 or the inner side surface of the tongue body 110. Therefore, the webbing fibers will not fuzz due to accidental wear and can maintain a certain aesthetic appearance.

[0045] Moreover, in the present embodiment, as shown in the figure, the protruding portion 123 is inclined such that the portion on the side of the shoulder side insertion hole 111 is higher than the central portion. By adopting such a structure, the situation where the webbing 300 gets stuck when feeding out the webbing 300 is reduced.

[0046] Figure 9 is a longitudinal sectional view of the tongue showing the released state ( Figure 9 (A)), and a longitudinal sectional view of the tongue showing the locked state ( Figure 9 (B)). As Figure 9 (A) shows, in the released state, both the locking member 130 and the guide member 120 are located away from the shoulder side insertion hole 111. In this state, the webbing 300 can move unobstructed whether moving from the shoulder side insertion hole 111 to the guide member 120 or from the guide member 120 to the shoulder side insertion hole 111. Therefore, when the occupant releases the webbing 300 to slacken the waist belt 320 side and when releasing the webbing 300 to slacken the shoulder belt 310 side, the operation can be carried out smoothly.

[0047] When a vehicle collision or the like occurs and the pulling force on the webbing 300 exceeds the biasing force of the biasing spring 140, the webbing 300 will push up the locking member 130. Then, the outer curved surface 130a of the locking member 130 contacts and slides on the guide curved surface 113 of the tongue body 110. As Figure 9 (B) shows, the locking member 130 approaches the shoulder side insertion hole 111 together with the guide member 120. Then, the locking member 130 presses the webbing 300 against the protruding contact portion 115 of the tongue body 110, and the movement of the webbing 300 is blocked by this pressing force, thus becoming the locked state.

[0048] The seat belt device 10 according to the present embodiment has been described above. However, within the scope not affecting each function, the specific shapes of the respective elements shown in the respective figures can be appropriately deformed. For example, the guide member 120 can be deformed as follows.

[0049] Figure 10 is the a-a cross-sectional view of the guide member 120' according to the modification corresponding to Figure 6 In the figure, the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof is omitted.

[0050] The guide member 120' has a protruding portion 123' deformed with respect to the guide member 120. Specifically, the height from the surface 121a to the protruding bottom surface 123'a on the opening side of the protruding portion 123' is higher than the height from the surface 121a to the protruding bottom surface 123'a on the side wall portion 122 side. That is, each protruding portion 123' has a large opening in the direction facing each other. With this structure, the operation of inserting the webbing 300 through the guide member 120' is facilitated during manufacturing.

[0051] In addition, in the above-described embodiment, side wall portions 122 are provided at both end portions of the flat portion 121 to restrict the movement of the webbing 300 in the width direction and restrict the position where it passes, but a structure other than the side wall portions 122 can also be used to restrict the position where the webbing 300 passes. For example, arranging a plurality of columnar protrusions can also restrict the position where the webbing 300 passes.

[0052] Reference Signs

[0053] 10…Seat belt device

[0054] 100…Latch

[0055] 110…Tongue body

[0056] 111…Shoulder side insertion hole

[0057] 112…Waist side insertion hole

[0058] 113…Guide surface

[0059] 114…Spring support portion

[0060] 115…Protruding abutting portion

[0061] 120, 120’…Guide member

[0062] 121…Flat portion

[0063] 121a…Surface

[0064] 121b…Back surface

[0065] 121c…Side surface

[0066] 122… Side wall part

[0067] 122a… Side wall surface

[0068] 123, 123’… Protrusion

[0069] 123a, 123’a… Protrusion bottom surface

[0070] 124… Guide protrusion

[0071] 125… Engaging part

[0072] 126… Guide cover

[0073] 126a… Cover surface

[0074] 127… Anti-collision rib

[0075] 130… Locking part

[0076] 130a… Outer curved surface

[0077] 130b… Bending part

[0078] 140… Biasing spring

[0079] 150… Tongue plate

[0080] 151… Opening part

[0081] 160… Lid

[0082] 200… Retractor

[0083] 300… Webbing

[0084] 310… Shoulder strap

[0085] 320… Waist belt

[0086] 330… Vertical belt

[0087] 400… Waist anchor

[0088] 500… Shoulder anchor

[0089] 600… Buckle

[0090] 610… Button

Claims

1. A tongue, comprising: A tongue piece main body having a first insertion hole and a second insertion hole for inserting and passing through a webbing, and a tongue plate for detachably connecting and fixing to a buckle; A locking member supported to be displaceable between a release position where it leaves the first insertion hole and enables the webbing to move, and a locking position where it approaches the first insertion hole and obstructs the movement of the webbing; A guide member assembled on the locking member to limit the position where the webbing passes relative to the locking member.

2. The tongue according to claim 1, wherein The guide member has a flat portion in contact with the wide surface of the webbing, and side wall portions respectively provided at both ends of the flat portion to limit the movement of the webbing in the width direction.

3. The tongue according to claim 2, wherein The guide member has a protruding portion protruding from the side wall portion to limit the distance between the webbing and the flat portion not to exceed a predetermined distance.

4. The tongue according to claim 3, wherein The height from the flat portion to the bottom surface of the protruding portion on the opening side is higher than the height from the flat portion to the bottom surface of the protruding portion on the side wall portion side.

5. The tongue according to claim 3, wherein The height from the flat portion to the bottom surface of the protruding portion on the side wall portion side is 1.2 times or more and less than 2.5 times the thickness of the webbing to be inserted.

6. The tongue according to claim 2, wherein The guide member has a guide portion extending from the back side of the surface of the flat portion opposite to the wide surface in contact therewith, and when assembled to the locking member, contacts a part of the locking member to guide the guide member to a predetermined position.

7. The tongue according to claim 1, wherein The locking member is formed of a metal material, and the guide member is formed of a resin material, The guide member is provided with a plurality of ribs in contact with the locking member on at least a part of the fitting surface fitting with the locking member.

Images