JP2001039265A - Shoulder height adjuster for seat belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of shoulder height adjusters for seat belts, reduce the number of components used, and facilitate assembly. SOLUTION: An operation knob 5 is mounted over the base end of a lock pin 4. That surface of a slide cover 3 which is opposite to a slider 2 has a lock pin guide 32 that projects around a through hole, which the point of the lock pin 4 passes, to guide the lock pin 4 and that has a spring seat at the projected end on which a spring for urging the lock pin 4 is pressed. That surface of the slide cover 3 which faces the slider 2 has jaws 34 and 35 projecting from the circumference of the through hole, and the projected ends of the jaws 34 and 35 are catches P bent back toward the through hole. When forced to the back surface side of the slider 2, the catches P couple the slide guide 3 to the slider 2. When the operation knob 5 is operated to dislodge the lock pin 4 from an engagement hole 11, this force urges the catches P of the jaws 34 and 35 more deeply to the back surface of the slider 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoulder height adjuster for a three-point seat belt mounted on an automobile or the like.

[0002]

2. Description of the Related Art In a three-point seat belt device installed in an automobile or the like, generally, one end of a webbing of a seat belt is fixed to a wrap outer anchor provided below a side wall of a vehicle interior, and the other end thereof is connected to a webbing. After passing through the inside of the sash guide supported by the shoulder anchor of the center pillar portion above it, it is wound up by the winding device. Then, by engaging the tongue plate provided at the webbing intermediate portion of the seat belt with the buckle device fixed to the wrap inner anchor, the seat belt is put on.

[0003] Further, in a device having a function of adjusting the height position of a shoulder anchor according to the height of the shoulder and the seat position of the occupant in a seated state, a guide rail is provided on the shoulder anchor, and the guide rail is provided on the guide rail. Slider (slide member) slidably supported and provided with a fixing mechanism that can be fixed at any sliding position
In addition, a device called a shoulder height adjuster, which is fixed by an anchor bolt for supporting the sash guide, is provided.

A mechanism for adjusting and fixing the position of the slider (slide member) with respect to the guide rail in such a shoulder height adjuster is disclosed, for example, in Japanese Utility Model Laid-Open No. 5-19.
As disclosed in Japanese Patent No. 023, a plurality of engagement holes are provided in a guide rail along the guide direction, and a slider (slide member) is provided with a lock pin capable of being inserted into the engagement hole with a tip. And a pair of operation buttons, which are also movable in the width direction of the slider (sliding member), are urged in a direction in which the operation buttons are separated from each other by a return spring, while being urged toward the guide rail in the axial direction. By operating the operation buttons in a direction to approach each other, the slope formed on each operation button and the push nut fixed to the lock pin abut, and the lock pin resists the urging force in the axial direction. There is known a structure in which an operation button for pulling out from an engagement hole is attached.

A slider (sliding member) in such a shoulder height adjuster generally includes a slider (sliding member).
A slide cover (garnish) made of resin is attached to cover the surface, and the slide cover covers the surface of the slider (slide member) itself and the guide rail, so that the head of the occupant comes into contact during a collision of the vehicle or the like. It is taken into consideration to prevent the damage (see the above publication).

[0006]

By the way, when the slide cover is integrally mounted on the slider (slide member), a plurality of locking claws are integrally formed on the slide cover while the slider (slide member) has the claws. This is performed by providing a hole in which the lock pin is fitted, and locking the claw in the hole. However, as seen in the above publication, when the lock pin is removed from the engagement hole of the guide rail, the slide cover is In order to prevent the slide cover from rattling or warping due to a force acting in the direction of detaching from the slider (slide member), the slide cover is screwed with screws or rivets near the upper and lower positions of the operation knob. (Slide member), which increases the number of parts and complicates the structure.

Further, according to the technique disclosed in the above publication, a mechanism for pulling out the lock pin from the guide rail against the urging force in the axial direction of the lock pin contacts the push nut mounted on the lock pin. Includes an inclined surface on the inner surface,
In addition, there is a problem that a complicated structure is required, such as providing a pair of operation buttons biased in a direction separated from each other by a return spring, and the number of components is large, and it is difficult to assemble the components.

The present invention has been made in view of such circumstances, and has a simplified structure, a reduced number of parts, and an easy assembling work for a seat belt shoulder height adjuster as compared with the prior art. The purpose is to provide.

[0009]

In order to achieve the above object, a shoulder height adjuster for a seat belt according to the first aspect of the present invention is provided near a shoulder portion of an occupant to deflect the webbing of the seat belt. A shoulder height adjuster for a seatbelt for adjusting the vertical position of the seat belt, which is fixed in the vehicle interior with the guide direction substantially along the vertical direction, and has a plurality of engagement holes formed in the guide direction. Guide rail, a slider that holds the sash guide and is slidably supported by the guide rail, a resin slide cover that is mounted on the slider while covering the surface thereof, and the slider And through the through hole formed in the slide cover in the axial direction and urged toward the guide rail in the axial direction, The position on the guide rail is fixed by the engagement of the distal end with a gap, and a lock pin provided with an operation knob is provided on the base end side thereof, and the slide cover has a side opposite to the slider. The lock pin rises from the side of the through hole and guides the lock pin in the axial direction, and the leading end of the rise comes in contact with one end of the lock pin at the base end face of the lock pin. A lock pin guide formed with a spring seat for abutting the other end of the biasing spring is formed, and a slider-side surface of the slide cover protrudes from a side portion of the through hole and is formed at a tip portion. The return portion wraps around the rear surface of the slider through a hole or an end formed in the slider to form pawls that engage with the slider. Across the through hole provided in the guide direction on both sides, characterized by the return portion of the respective tip protrudes opposing orientation.

According to the first aspect of the present invention, the mechanism for operating the lock pin to be disengaged from the engagement hole of the guide rail against the urging force has the operation knob mounted on the base end side of the lock pin. Then, simply pulling the lock pin directly pulls out the lock pin from the engagement hole, so that the structure is simple and the number of parts can be reduced, and the lock pin operates at the time of detachment operation from the engagement hole. This force acts to increase the coupling force of the slide cover to the slider, and it is not necessary to fix the slide cover to the slider with screws or rivets.

That is, when the operating knob is pulled in a direction away from the guide rail so that the lock pin is disengaged from the engagement hole, a spring seat formed on the leading end of the rising of the lock pin guide formed on the slide cover. A force in the same direction acts via a spring that biases the lock pin toward the guide rail. This force causes the resin slide cover to bend so that the center of the spring seat of the lock pin guide (and therefore the center of the through hole) is separated from the slider. Of the claw formed on the side opposite to the front end of the claw is inclined toward the center of the through hole. The claw is formed with a return portion protruding toward the through-hole, and wraps around the back side of the slider through the hole or the end of the slider to engage with the slider. With this operation, the return portion of the claw goes deeper into the back surface of the slider. When such claws are provided on both sides of the guide rail in the guide direction with the through hole interposed therebetween so that the return portions protrude, the pair of claws return to each other when the operation knob is operated as described above. The part is inclined in the direction of approach, and the return part of the tip of each claw is fitted deeply into the back of the slider so that the slider embraces the slider from both sides, the coupling force increases, and these two need to be fixed separately with screws etc. There is no.

According to another aspect of the present invention, there is provided a shoulder height adjuster for a seat belt according to a second aspect of the present invention, wherein the sash guide is disposed near a shoulder of an occupant and deflects webbing of the seat belt. A shoulder height adjuster for a seat belt for adjusting a position, wherein the guide is fixed in a vehicle cabin with a guide direction substantially along a vertical direction, and has a plurality of engagement holes formed in the guide direction. A rail, a slider that holds the sash guide and is slidably supported by the guide rail, a resin slide cover that is mounted on the slider while covering the surface thereof, the slider and the slide cover Is urged toward the guide rail in the axial direction through the through hole formed in the
The distal end is engaged with any one of the engagement holes to fix the position on the guide rail, and a lock pin provided with an operation knob is provided at the base end thereof, and the slide cover is provided. The lock pin rises from the side of the through hole to the side opposite to the slider to guide the lock pin in the axial direction, and one end of the leading end of the lock pin comes into contact with the base end side end face of the lock pin. A lock pin guide formed with a spring seat for abutting the other end of the spring for biasing the pin is formed, and the lock pin has protrusions formed on both sides at its base end, which are orthogonal to the axial direction. And projecting from both sides of the lock pin guide,
The operating knob is formed with two engagement grooves into which the respective projecting portions of the lock pin are fitted in a direction orthogonal to the axial direction of the lock pin. A configuration is adopted in which the operation knob is mounted on the lock pin by sliding the operation knob in the mating groove and sliding the operation knob in the direction in which the engagement groove is formed.

[0013] In the invention according to claim 2, the operation knob comes into contact with the slide cover so that the operation knob does not come off from the lock pin within an axial movement range of the lock pin. A knob guide for preventing movement of the lock pin in a direction perpendicular to the axial direction is formed, and the knob guide moves the lock pin to one end of the movement range where the operation knob is farthest from the slide cover. It is preferable to adopt a configuration in which the height is set such that the lock pin can be moved in a direction inclined by a predetermined angle or more with respect to a direction orthogonal to the axial direction of the lock pin.

According to the second aspect of the present invention, similarly to the first aspect, the mechanism for operating the lock pin to be disengaged from the engagement hole of the guide rail against the urging force is a lock pin. Attach the operation knob to the base end of the lock pin, and simply pull it out to pull out the lock pin directly from the engagement hole, so that the structure is simple and the number of parts is small. To assemble the operation knob with respect to the pin, insert each projection provided at the base end of the lock pin and projecting outward from both sides of the lock pin guide into each engagement groove of the operation knob. Can be done easily. And after attaching the operation knob,
By the spring provided between the lock pin and the spring seat of the lock pin guide, the biasing force of the spring works in close contact with the surface of the slide cover together with the lock pin, and the spring is held in a certain place. Can be stabilized, and the workability of assembling can be improved.

According to the third aspect of the present invention, the operating knob comes into contact with the knob guide within the range of movement of the lock pin in the axial direction so that the lock pin moves in the direction perpendicular to the axial direction. As a result, it is possible to prevent the operation knob from coming off the lock pin even when an operation force in a direction different from the axial direction of the lock pin is applied when operating the operation knob, and the operation by the knob guide By restricting the movement of the knob, the movement direction of the lock pin is more reliably regulated together with the regulation by the lock pin guide, so that the detachment operation with respect to the engagement hole can be made more reliable. Since the knob guide allows the operation knob to move in a direction inclined at a predetermined angle or more with respect to a direction orthogonal to the axial direction of the lock pin, the operation knob is attached to the lock pin at an angle greater than the above angle. It is sufficient that the protrusion of the lock pin is fitted into the engagement groove while moving the operation knob in the direction in which the operation knob is moved, and once assembled, the operation knob is inclined at an angle or more to remove the operation knob intentionally. The operation knob does not come off unless it is moved in the direction.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a front view showing an assembled state, and FIG. 3 is a sectional view taken along line AA of FIG. FIG.
(A) is a front view of the slide cover 3, FIG. (B) is a BB cross-sectional view, and FIG. (C) is a left side view near the lock pin guide 33 of FIG. It is. In addition,
1 and 2, illustration of the sash guide 8, the webbing W, and the like is omitted to avoid complicating the drawings.

A plurality of engagement holes 11 are formed in the guide rail 1 in the guide direction (longitudinal direction) of the guide rail 1. The guide rail 1 has a guide direction substantially along the vertical direction. It is fixed to the side wall in the room. The slider 2 is slidably supported against the guide rail 1. A thin resin piece 2a is inserted between the guide rail 1 and the slider 2 to make the sliding between them smooth.

The slider 2 is provided with a resin slide cover 3 for covering the surface thereof. This slide cover 3
A through-hole 31 for allowing a lock pin 4 to be described later to pass therethrough is formed, and a lock pin guide 32 having a substantially U-shaped cross section rises from both upper and lower sides of the through-hole 31 to the side opposite to the slider 2. I have. The lock pin guide 32 connects the upper and lower side walls 32 a rising from the side of the through hole 31 to the respective leading ends thereof, and forms a spring seat of a compression coil spring 7 for urging the lock pin 4 described later. The opening 32c is formed on both left and right side surfaces. Above the lock pin guide 32, a knob guide 33 for guiding an operation knob 5 described later is formed. On the other hand, on the surface opposite to the lock pin guide 32, three claws 34, 35, and 36 for coupling with the slider 2 are formed so as to protrude. Of these, the upper two claws 34 and 35 have through holes. 3
1 are formed near both upper and lower sides. Also, nail 3
Between 5 and 36, there is formed a through-hole 37 through which a nut 61 of an anchor bolt 6 described later passes. The slide cover 3 covers the surface of the slider 2 in a state where the slide cover 3 is connected to the slider 2 by the three claws 34, 35 and 36, and extends to both upper and lower sides of the slider 2. The guide rail 1 is covered by 38 and 39.

The slider 2 is provided with a through hole 21 for passing the lock pin 4 and a long through hole 22 for passing a nut 61 for fixing the anchor bolt 6. Correspond to the positions where the through holes 31 and the long through holes 37 are formed. The slider 2 has a hole 23 into which the claw 35 is inserted, corresponding to the position where the claw 35 at the center of the slide cover 3 is formed.

The lock pin 4 has a flange 41 at its base end as shown in FIG. 1, is housed inside a lock pin guide 32 formed on the slide cover 3, and is opened through the left and right openings 32c. With the portion 41 protruding to the outside, it is slidably guided in the axial direction by the side wall portion 32 a, and its distal end side passes through the through hole 31 and then passes through the through hole 21 of the slider 2. The lock pin 4 is urged toward the guide rail 1 by a compression coil spring 7 inserted between a base end thereof and a ceiling 32b of the lock pin guide 32.

An operation knob 5 is mounted on a flange 41 formed at the base end of the lock pin 4. As shown in FIG. 1, the operating knob 5 is formed with an engagement groove 51 extending in a direction perpendicular to the axial direction of the lock pin 4 on the inner surface side thereof. The lock pin 4 and the operation knob 5 are connected to each other by fitting the flange portion 41 of FIG. With this configuration, the lock pin 4 can be disengaged from the engagement hole 11 of the guide rail 1 against the elastic force of the compression coil spring 7 by grasping the operation knob 5 and pulling the knob away from the guide rail 1. It has become.

The protrusion amount of the knob guide 33 of the slide cover 3 is such that the lock pin 4 is moved to the moving end in the direction away from the guide rail 1 with the operation knob 5 mounted on the lock pin 4. At this time, the bottom surface of the operation knob 5 and the surface of the slide cover 3 are slightly larger than the distance. Therefore, within the axial movement range of the lock pin 4, the upper outer wall surface of the operation knob 5 comes into contact with the knob guide 33, and the operation knob 5 moves along the axial direction of the lock pin 4. Only guided to move.

The anchor bolt 6 is fixed to the slider 2 by being screwed into a nut 61 which is inserted into the through-hole 22 of the slider 2 and the through-hole 37 of the slide cover 3 and is prevented from rotating. Is done. A sash guide 8 for deflecting the webbing of the seat belt is swingably supported by the anchor bolt 6. Reference numeral 9 denotes a sash guide cover that covers the anchor bolt 6 and the base of the sash guide 8. The sash guide cover 9 is attached to the slide cover 3, and the operation knob 5 is provided inside a through portion 91 formed in the sash guide cover 9. It is located and exposed to the passenger compartment.

Now, each of the claws 3 of the slide cover 3 described above.
A return portion P is formed at the tip of each of the holes 4, 35, and 36. Of these, the return portions P of the claws 34, 35 formed on both upper and lower sides of the through hole 31 are respectively formed on the side of the through hole 31. Therefore, the return portions P of the claws 34 and 35 project opposite to each other. The return portion P of the claw 36 protrudes upward. Then, each of the claws 34, 35 and 36
Is engaged with the slider 2 by the return portion P wrapping around the back surface of the slider 2 via the upper and lower end surfaces of the slider 2, and the hole of the slider 2 is Return part P through 23
Is also wrapped around the back side of the slider 2. The mounting of the slide cover 3 on the slider 2 is performed only by these three claws 34, 35, and 36, and is not performed by screws, rivets, or the like. It is possible to prevent the slide cover 3 from rattling or warping in a direction away from the slider 2 when the lock pin 4 is disengaged from the engagement hole 11 by the operation knob 5.

That is, by operating the operation knob 5, the lock pin 4 is pressed against the urging force of the compression coil spring 7.
Is applied to the slide cover 3 via the compression coil spring 7, a force is applied to the ceiling 32 b of the lock pin guide 32 in a direction away from the slider 2. This force acts along the center of the compression coil spring 7 and thus along the central axis of the lock pin 4, that is, along the center of the through hole 31. With this force, the resin slide cover 3 tends to be curved so that the center of the through hole 31 is separated from the slider 2 as shown in an exaggerated schematic sectional view in FIG. The tips of the claws 34 and 36 formed at the front end are inclined toward the center of the through hole 31. And
The return portions P at the tips of the claws 34 and 35 are engaged with the slider 2 by projecting toward the through holes 31 so as to face each other and turning around the back surface of the slider 2. Due to the inclination of the claws 34 and 35 due to the action of the applied force, the return portions P come closer to each other, and therefore go around the back surface of the slider 2 more so as to embrace the slider 2. And further increase. As a result, the slide cover 3
Is not separately fixed to the slider 2 with screws or the like, so that the slide cover 3 does not rattle or largely warp when the operation knob 5 is operated.

In the above embodiment, the operating knob 5 is guided by the knob guide 33 of the slide cover 3 within the range of movement of the lock pin 4 in the axial direction, and is orthogonal to the lock pin 4 in the axial direction. As a result, it is possible to prevent the flange portion 41 of the lock pin 4 from being detached from the engagement groove 51 and the operation knob 5 from coming off. The protrusion amount of the knob guide 33 is slightly smaller than the distance between the bottom surface of the operation knob 5 and the surface of the slide cover 3 in a state where the lock pin 4 is moved to the moving end in a direction away from the guide rail 1. Since the size is large, the operation of attaching the operation knob 5 to the lock pin 4 is easy as described below.

That is, when the operation knob 5 is mounted on the lock pin 4, as shown schematically in FIG. 6, the lock pin 4 is moved to a moving end in a direction away from the guide rail 1. , The bottom of the operation knob 5 with the knob guide 3
3 and a lock pin 4 as shown in FIG.
Is tilted by a predetermined angle or more with respect to a direction perpendicular to the axial direction of the shaft, and the operation knob 5 is moved in the tilt direction. , Flange portion 4 with respect to engagement groove 51.
1 can be inserted, and the operation knob 5 can be easily attached to the lock pin 4. After the mounting, the operating knob 5 is stably brought into contact with the surface of the slide cover 3 by the urging force of the compression coil spring 7, and the operation knob 5 is intentionally moved to the position of the compression coil spring 7. Unless the lock pin is moved to the moving end of the lock pin against the urging force and tilted more than the above angle and moved in the tilt direction, the operation knob 5 does not detach from the lock pin 4.

[0028]

As described above, according to the first aspect of the present invention, the structure for attaching the slide cover to the slider is directed toward the through hole formed in the slide cover and through which the lock pin passes. A plurality of claws formed with return portions are provided on both sides of the through hole so that the return portions are opposed to each other, and these claws are merely engaged with the slider. Without fixing both of them, the slide cover does not largely separate from the slider when the lock pin is disengaged from the engagement hole by the operation knob, but rather each claw acts to strengthen the coupling force of these two, The operation of the operation knob can be reliably performed with a simple structure and a small number of parts.

According to the second aspect of the present invention, the flange provided at the base end of the lock pin and projecting from both sides of the lock pin guide is fitted into the engagement groove formed in the operation knob. As a result, the operation knob can be mounted on the lock pin, so that it can be assembled very easily with a simple and small number of parts, and after the operation, the operation knob is biased by the lock pin. Since the slide cover is stably brought into contact with a certain position of the slide cover by the means, it is possible to stabilize the state in the middle of assembling, thereby improving workability. A knob guide for guiding the operation knob is provided as in the invention according to claim 3, and the knob guide causes the operation knob to be orthogonal to the axial direction of the lock pin within the range of movement of the lock pin in the axial direction. While preventing movement in the direction, while allowing movement in the direction inclined with respect to the direction perpendicular to the axial direction of the lock pin, the ease of assembling the operation knob is achieved. It is possible to reliably prevent the operation knob from being detached from the lock pin after assembly.

According to the present invention, a mechanism for operating the lock pin to be disengaged from the engagement hole of the guide rail against the urging force thereof is provided on the base end side of the lock pin for operation. Since the lock pin is just pulled out directly from the engagement hole by attaching the knob and simply pulling it, compared to the conventional mechanism using a push nut or a return spring for the operation button, Not only the structure is simple and the number of parts is small, but also the number of assembling steps can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a front view showing an assembled state of the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

4A and 4B are explanatory views of a slide cover 3 used in the embodiment of the present invention, wherein FIG. 4A is a front view, and FIG.
-B sectional view, (C) is the lock pin guide 33 of FIG.
FIG.

FIG. 5 exaggerates the force acting on the slide cover 3 and the deformation state accompanying the operation when the operation pin 5 is disengaged from the engagement hole 11 by the operation knob 5 according to the embodiment of the present invention. It is a typical sectional view shown.

FIG. 6 is a schematic diagram for explaining a method of attaching the operation knob 5 to the lock pin 4 according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide rail 11 Engagement hole 2 Slider 21 Through hole 22 Through long hole 23 Hole 3 Slide cover 31 Through hole 32 Lock pin guide 32a Side wall 32b Ceiling 32c Opening 33 Knob guide 34, 35, 36 Claw 37 Through long hole 38 , 39 extension part 4 lock pin 41 flange part 5 operation knob 51 engagement groove 6 anchor bolt 61 nut 7 compression coil spring 8 sash guide 9 sash guide cover P return part

Claims (3)

[Claims] 1. A shoulder height adjuster for a seat belt which is disposed near a shoulder of an occupant and adjusts a webbing of a seat belt in a vertical direction of a sash guide. A guide rail having a plurality of engagement holes formed in the guide direction in a state in which the sash guide is provided, a slider slidably supported by the guide rail while holding the sash guide, and the slider And a slider cover made of resin that is mounted in a state of covering the surface thereof, and is urged toward the guide rail in the axial direction by passing through the through hole formed in the slider and the slide cover in the axial direction. The tip is engaged with one of the engagement holes to fix the position on the guide rail, and an operation knob is mounted on the base end side. A lock pin is provided, and on the surface of the slide cover opposite to the slider, the lock pin rises from the side of the through hole to guide the lock pin in the axial direction. A lock pin guide formed with a spring seat for abutting the other end of the spring that biases the lock pin with one end abutting on the end side end surface is formed.The slider-side surface of the slide cover includes: A plurality of claws are formed that protrude from the side of the through-hole, and the return portion formed at the tip portion goes around the slider back surface through the hole or the end formed in the slider to engage with the slider. At the same time, each of the claws is provided on both sides in the guide direction with the through hole of the slide cover interposed therebetween, and the return portions of the respective tips protrude in opposite directions. Shoulder height adjuster for the seat belt to the butterflies. 2. A shoulder height adjuster for a seat belt for adjusting a vertical position of a sash guide arranged near a shoulder of an occupant and deflecting webbing of a seat belt, wherein the guide direction is substantially vertical. A guide rail fixed in the passenger compartment in a state in which the guide rails are aligned, and formed with a plurality of engagement holes in the guide direction, a slider holding the sash guide and slidably supported by the guide rail, A resin slide cover that is mounted on the slider while covering the surface thereof, and a through hole formed in the slider and the slide cover that extends axially toward the guide rail. When the tip is engaged with one of the engagement holes, the position on the guide rail is fixed, and an operation knob is provided at the base end side. The slide cover is provided on the slide cover so as to rise from the side of the through hole to the side opposite to the slider to guide the lock pin in the axial direction. A lock pin guide formed with a spring seat for abutting the other end of a spring for urging the lock pin with one end contacting the end side end surface is formed, and the lock pin has a shaft at its base end. Protrusions perpendicular to the direction are formed on both sides and protrude on both sides of the lock pin guide, and the operating knob has two engagement grooves into which the respective protrusions of the lock pin fit. It is formed in a direction perpendicular to the axial direction of the lock pin, and the protrusion for the lock pin is fitted in each engagement groove, and the operation knob is slid in the formation direction of the engagement groove for operation. Shoulder height adjuster for a seat belt, wherein the blanking is attached to the locking pin. 3. A direction perpendicular to the axial direction of the lock pin by abutting the slide knob on the slide knob so that the lock knob does not come off the lock knob within the range of movement of the lock pin in the axial direction. A knob guide that prevents movement of the lock pin is formed, and the knob guide moves in the axial direction of the lock pin in a state where the lock knob is moved to one end of the above-mentioned movement range where the operation knob is farthest from the slide cover. 3. The shoulder height adjuster for a seat belt according to claim 2, wherein the shoulder height adjuster is formed so as to be movable in a direction inclined by a predetermined angle or more with respect to a direction orthogonal to the direction orthogonal to the direction.