JPS6251602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in seat belt buckles.

In conventional seat belt buckles, each component is made thick to provide strength so that it can reliably receive the tensile force of the tongue when the tongue is locked. However, in this case, there is a problem that the buckle becomes heavy and the material cost increases.

The present invention has been made in view of this, and its purpose is to increase the area of the area that receives the tensile force of the tongue, and to increase the area of the area that receives the tensile force of the tongue. An object of the present invention is to provide a seat belt buckle that can be provided on the center line of the seat belt and manufactured at low cost using a thin material.

The present invention will be described below with reference to illustrative embodiments.

FIG. 1 is a perspective view of a seat belt buckle. This seat belt buckle is constructed by combining first and second covers 1 and 2, a base member 3, a latch pin release member 4, a tongue 5, a latch pin 6, a turn lever 7, a slider 8, and the like.
The first cover 1 forms a case of the buckle in combination with the second cover 2.
Inside, there is a push button 9 and this push button 9 is marked with an arrow A.
A compression coil spring 10 for restoring the push button that presses in the opposite direction is attached, and the turn lever guide portions 1a are further provided on both sides of the interior. The push button 9 is used to turn the turn lever 7 in the direction of arrow B by pushing it in the direction of arrow A.
There is a groove-shaped turn lever push part 9a at the contact point with the
9b.

The turn lever 7 has a pair of lever plates 11,
11 are connected by a connecting piece 12, and each lever plate 1
1 has a push button receiving portion 11a protrudingly formed on the push button 9 side, a releasing curved surface 11b on the releasing member 4 side, and a shaft hole 11c. This shaft hole 11c is pivotally supported by a turn lever branch 3a provided on the base member 3 and serves as the center of rotation of the turn lever 7.
While the distance to a is long, the shaft hole 1
The distance from 1c to the dissociation curved surface 11b is short at the rotation start point s, and gradually increases toward the rotation end point.

Base member 3 equipped with this turn lever 7
is formed by bending the strip-shaped plate-shaped base 3b in the direction of the dissociation member 4 so as to expand both sides thereof, and provides through-holes 13, 13 in these bent parts 3c, 3c, respectively, and the plate-shaped base 3b An insertion hole 14 is provided in the
Further, the above-mentioned turn lever supports 3a, 3a are formed to protrude from both sides of the plate-shaped base 3b. In this case, the bending angle θ of the bending portions 3c, 3c is preferably about 30 to 70°. The disassembly member 4 is attached to the base member 3 so as to be openable and closable. This disassembly member 4 has a through hole 15 in the center of a plate-like base 4a, hook-shaped protruding supports 4b on both sides, and turn lever receiving pieces 4c and 4 on both sides of the end.
It is set up so as to expand c. The above through hole 15
consists of a semicircular large-diameter portion and a long hole-shaped portion, and a stepped portion 15a is formed between them. The projecting supports 4b, 4b are inserted into the through holes 13, 13 and engaged with the upper edges thereof, and are inserted into the through holes 13, 13 and engaged with the upper edges thereof.
The dissociation member 4 can be rotated in the opening direction (direction away from the base member 3) and the closing direction (direction approaching the base member 3) using the contact surfaces 4d, 4d between the dissociation member 3 and the dissociation member 4 as fulcrums. There is. Furthermore, the turn lever receiving pieces 4c, 4c are the ones in which the curved surface 11b for disassembly of the turn lever 7 comes into contact, and as shown in FIG. Further, as shown in FIG. 3, the disassembly member 4 is open with the end point of rotation in contact with the base member 3.
An insertion hole 16 is provided in the insertion tongue piece 5a.

Further, the second cover 2 is formed with a tongue insertion opening 2a into which the insertion tongue piece 5a of the tongue 5 is inserted, and a leaf spring 18 attached to the metal fitting 17 inside.
is installed. The latch pin 6 is attached to this leaf spring 18, and presses the latch pin 6 in the direction of arrow C. This latch pin 6 has a flange portion 6a.
and a pin portion 6b, and one half of the end surface of the pin portion 6b in the direction opposite to the tongue insertion opening 2a is an inclined surface 6c inclined toward the flange portion 6a. This latch pin 6 has a pin portion 6b passing through the insertion hole 15 of the disassembly member 4, and the elastic force of the leaf spring 18 allows the latch pin 6 to pass through the insertion hole 16 of the tongue 5 and the insertion hole 1 of the base member 3.
4 to fix these members and lock the tongue 5. The latch pin 6 has a pin portion 6b that loosely passes through the insertion hole 15 of the dissociation member 4 so that it can slide slightly, and a collar portion 5a that supports the stepped portion 15a as a fulcrum as shown in FIG. Since the disassembly member 4 can be tilted as shown in FIG.

Further, inside the base member 3, the slider 8 and a compression coil spring 19 for pressing the tongue in the direction of arrow D are mounted. This slider 8 pushes back the tongue 5 with the dissociation member 4 open, and is further inserted between the dissociation member 4 and the base member 3 to release the dissociation member 4 in the open state and the latch pin 6. It maintains the state.

Next, the operation of the seat belt buckle constructed as described above will be explained.

First, before inserting the tongue 5, the disassembly member 4 is pushed open by the slider 8, as shown in FIG. 4, and the latch pin 6 is removed from the insertion hole 14 of the base member 3.

In this state, as shown in FIG. 5, when the tongue 5 is inserted from the tongue insertion opening 2a, the tongue 5 pushes back the slider 8 in the direction opposite to the arrow D direction against the elastic force of the compression coil spring 19 for pushing out the tongue. When the slider 8 separates from the releasing member 4, the latch pin 6 is pressed in the direction of arrow C by the elastic force of the leaf spring 18, and at the same time, the releasing member 4 closes, and the latch pin 6
passes through the insertion hole 16 of the tongue 5 and the insertion hole 14 of the base member 3. In this state, the tongue 5 is locked to the base member 3 and the release member 4 via the latch pin 6. At this time of locking, as shown in FIG. It is received by the inner wall of the through hole 13 that is in contact with the side surface of the protruding support 4b.

In this locked state, the rotation start point s of the curved release surface 11b of the turn lever 7 is in contact with the turn lever receiving piece 4c of the release member 4.

Next, to release tongue 5 from the locked state,
As shown in FIG. 6, the push button 9 is pushed in the direction of arrow A against the elastic force of the compression coil spring 10 for restoring the push button. By this pushing, the turn lever pushing part 9
The pushbutton receiver 11a at position a rotates in the direction of arrow B. Due to this rotation, the contact point between the disassembly curved surface 11b and the turn lever receiving piece 4c moves from the rotation start point s to the rotation end point. As a result of this movement, the turn lever receiving piece 4c of the disassembly member 4 opens, and in conjunction with this, the latch pin 6 moves in the direction opposite to the direction of arrow C, and passes through the insertion hole 14 of the base member 3 and the insertion hole 16 of the tongue 5, respectively. It comes off. Here, since the distance between the shaft hole 11c of the turn lever 7 and the rotation start point s is significantly shorter than the distance between the shaft hole 11c and the push button receiving portion 11a, the turn lever receiving portion is moved with a large force due to the so-called lever principle. 4c, 4c in the opening direction, the latch pin 6 can be separated from the insertion hole 14 of the base member 3 and the insertion hole 16 of the tongue 5. That is, when removing the latch pin 6, a frictional force is generated due to the tensile force of the tongue 5, and the frictional force is particularly significant in the initial stage of removing the latch pin 6, and therefore a large pressing force is required. The latch pin 6 can be smoothly released. Furthermore, since the distance of the disassembly curved surface 11b is increased toward the end point of rotation, even if the rotation angle of the turn lever 11 is small, the amount of movement of the dissociation member 4 and the latch pin 6 is large enough to allow the latch pin 6 to pass through the hole. It can be reliably dissociated from 14 and 16. Additionally, latch pin 6
When removing it, it can be pressed with a relatively small force except for the initial stage, so there is no problem even if the distance is long. Further, the insertion hole 15 of the dissociation member 4 is
The latch pin 6 is formed to be looser than the diameter of the latch pin 6.
can slide slightly inside the insertion hole 15. Further, since the insertion hole 15 forms a stepped portion 15a, the latch pin 6 can tilt slightly using this as a fulcrum. Therefore, when the disassembly member 4 is opened by the action of the turn lever 7, the latch pin 6 can be moved vertically downward (in the direction opposite to the direction of arrow C) regardless of the rotation direction of the dissociation member 4, and the latch pin 6 can be moved vertically downward (in the direction opposite to the direction of arrow C). The pin 6 can be smoothly disengaged. Furthermore, since an inclined surface 6c is formed on the end surface of the latch pin 6,
Even if the dissociation member 4 does not open much, when the tongue 5 is pulled, the inner wall of the insertion hole 16 hits the inclined surface 6c, and the latch pin 6 is pushed down in the direction opposite to the arrow C direction, so that the tongue 5 can be removed.

Then, with the dissociation member 4 open, the slider 8 is moved to the compression coil spring 19 for the tongue extrusion slider.
It moves in the direction of arrow D by the elastic force of , enters between the base member 3 and the releasing member 4, and maintains the releasing member 4 in an open state. In this state, the tongue 5 that has come off the latch pin 6 can be removed.

This seatbelt buckle uses a turn lever 7 to change the force direction of the push button 9, but one place on the base member 3 is processed as a fulcrum for the turn lever 7 to form a turn lever branch 3a. , 3a, there is no need to use a new round bar or the like as a fulcrum, and the number of parts can be reduced.

According to the present invention, since both sides of the base member are bent to expand, the opening and closing operations of the disassembling member can be performed smoothly without getting caught in the middle. In addition, since the bent part is inclined, the area in contact with the inner wall of the through-hole of the bent part and the protruding branch of the dissection member becomes large, and the tensile force of the tongue is applied at three points: the inner wall of the through-hole and the inner wall of the insertion hole. The locking of the tongue is ensured for receiving.

Therefore, the base member, the releasing member, etc. can be made thinner, the weight can be reduced, and the cost of materials can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a seat belt buckle showing an embodiment of the present invention, FIGS. Figures 6 through 6 are operation explanatory diagrams showing the locking operation of the same buckle in order;
FIG. 7 is a front view showing a state in which the base member, the releasing member, and the latch pin are locked, and FIG. 8 is an explanatory view showing the latch pin passing through the releasing member. DESCRIPTION OF SYMBOLS 1...First cover, 1a...Turn lever guide part, 2...Second cover, 2a...Tang insertion port, 3...Base member, 3a...Turn lever branch, 3b...Plate base, 3c ...Bending part, 4...
Latch pin disassembly member, 4a... plate-like base, 4b...
...Protruding branch, 4c... Turn lever receiving piece, 4d...
...Contact surface, 5...Tang, 5a...Insertion tongue piece, 6
...Latch pin, 6a...flange part, 6b...pin part,
6c... Inclined surface, 7... Turn lever, 8... Slider, 9... Push button, 9a... Turn lever pushing part, 10... Compression coil spring for restoring push button, 11... Lever plate, 11a... ...Push button receiving part, 11b...Curved surface for disassembly, 11c...Shaft hole, 1
2... Connecting piece, 13... Through hole in base member, 14
...Throughout hole of base member, 15...Through hole of dissociation member, 15a...Step, 16...Tang insertion hole, 17...Metal fitting, 18...Plate spring, 19...Compression for tongue extrusion coil spring.

Claims (1)

[Claims] 1. A base member having bent parts with enlarged tips on both sides of a plate-like base, a through hole in the bent parts and an insertion hole in the base, and a plate-like base with the insertion holes formed with the through hole. A latch pin release member is provided with a protruding support that is inserted into and engages with the base member, and is attached to the base member so as to be openable and closable using the contact surface with the through hole of the base member as a fulcrum, and between the release member and the base member. A tongue with an insertion hole to be inserted, a latch pin that presses the dissociation member in the closing direction and passes through the insertion holes of the dissociation member, the tongue, and the base member, respectively, and a latch pin that presses the dissociation member in the opening direction and passes through the insertion holes of the dissociation member, the tongue, and the base member, respectively. a turn lever that presses the tongue in a direction to release it from the insertion hole; a push button that operates the turn lever; and a push button that pushes out the tongue when the release member is open and is interposed between the base member and the release member. With the latch pin passed through the insertion holes of the dissociation member, the tongue, and the base member, the tensile force of the tongue is applied to the inner wall of the dissociation member, the base member, and the base member through the latch pin. A buckle for a seat belt, characterized in that the buckle is received by the inner wall of the through hole and the side wall of the protruding branch of the member.