Braking device of a seat for a vehicle

Abstract

Braking device of a seat for a vehicle, characterized in that it comprises the following parts: an input member (20) which is rotated and connected to a lever (10) which the occupant operates; an unlocking element (30) which is pressed and moved in the axial direction by rotation of the input element (20); a housing (70) on one side of which the input element (20) and the unlocking element (30) are installed; a brake ring (40) mounted on the other side of the housing (70); a pinion shaft (50) rotatably installed in the housing (70) through the brake ring (40); a brake element (60) installed between the brake ring (40) and the pinion shaft (50) for restricting the pinion shaft (50) from the brake ring (40) or releasing its locking state; and a tooth plate (100) installed on the unlocking member (30) to restrict rotation of the pinion shaft (50).

Description

[Technical Field of Invention]The present invention relates to a seat braking device for a vehicle, and is a seat braking device for a vehicle that maintains a set height after the height of a seat cushion is adjusted.[Technical Background of the Invention]The braking device of a seat for a vehicle is a device installed in the seat cushion frame, which allows the height of the seat to be adjusted by a seat height adjustment mechanism by restricting or releasing the operation of a rack member installed in the inside of the seat cushion frame as a component of the seat height adjustment mechanism.The braking device of a seat comprises a pinion shaft in which a pinion meshed with the rack of the rack member is formed. And at this time, the height of the seat can be adjusted by the operation of the seat height adjustment mechanism such that, on the one hand, by restricting the rotation of the pinion shaft using a plurality of brake rollers, the height of a seat is kept constant, and on the other hand, when the occupant operates the lever, the locking state of the pinion shaft is unlocked by the brake rollers.However, in the conventional brake device of a seat, there is a problem that a downward sagging phenomenon occurs, wherein when a load is repeatedly applied by the weight of the occupant for a long period of time, the frictional force between the pinion shaft and the brake roller is reduced and the pinion shaft is slidably rotated, and as a result, the height of the seat (exactly, the height of the seat cushion) is not held fixed.[State of Technical Document][Patent Document](Patent 1) KR 10 2021 0 067 586 A (08. 06. 2021) relates to a height adjusting device for a vehicle seat that releases the state in which the height of a seat is fixed so that the height of the seat can be adjusted. The height adjusting device for a vehicle seat includes: a housing fixed to the cushion frame of the seat; an input unit installed in the housing so as to be rotatable in conjunction with an operation lever; a control unit selectively pressed to move in an axial direction in response to the rotation of the input unit; a fixing unit having a wedge-shaped inclined surface and a static friction surface formed on the inner circumferential surface thereof; a brake unit having a toothed portion formed to mesh with a gear unit provided in the cushion frame of the seat and having a brake surface opposite to the inner circumferential surface of the fixing unit; and a plurality of brake members for restricting the rotation of the brake unit between the static friction surface and the brake surface, which are moved toward the wedge-shaped inclined surface by the control unit to cancel the restriction of the rotation of the brake unit.US 2019 / 0210489 A1 discloses a clutch unit comprising a lever-side clutch part for controlling transmission and interruption of the torque input by lever operation, and a brake-side clutch part for transmitting the torque from the lever-side clutch part to an output side and interrupting the torque input inversely from the output side. The brake-side clutch part includes a cover restricted in rotation, an output shaft for outputting the rotation, an inner ring for receiving the torque input from the lever-side clutch part, and a cylindrical roller for controlling interruption of the torque from the output shaft and transmission of the torque from the inner ring by engagement and disengagement between an outer ring and the output shaft. The inner ring has a sliding toothing which meshes with the cover when the torque is interrupted and is released from the engaged state when the torque is transmitted.[Content of Invention][Object of Invention]Therefore, the present invention is made to solve the above problems, and since even if the binding force of the pinion shaft is reduced by the brake roller in the locked state of the brake, the rotation of the pinion shaft is not possible, a reduction in the height of the seat, that is, a seating sagging phenomenon can be prevented.[Technical Solution]To achieve this purpose, the present invention includes the following parts: an input member that is rotated and connected to a lever that the occupant is operated; an unlocking member that is pushed and moved by rotation of the input member in the axial direction; a housing on one side of which the input member and the unlocking member are installed; a brake ring mounted on the other side of the housing; a pinion shaft rotatably installed in the housing through the brake ring; a brake member installed between the brake ring and the pinion shaft to restrict the pinion shaft from the brake ring or release the locked state thereof; and a gear plate installed on the unlocking member to restrict rotation of the pinion shaft.The tooth shape formed on the inner circumferential surface of the tooth plate meshes with the tooth shape formed on an end part of the pinion shaft.The tooth shape of the tooth plate and the tooth shape of the pinion shaft are mutually limited in the circumferential direction and are freely separated in the axial direction.The tooth plate is inserted inside the unlocking member, the upper surface of the tooth portion is in close contact with the upper surface of the inner space of the unlocking member, and the lower surface of the tooth portion is in contact with and supported by a second spring that elastically supports the unlocking member in the opposite direction of the housing.A plurality of protrusion parts are formed on the outer peripheral surface of the tooth plate, and since the protrusion parts are inserted into the locking grooves formed on the inner peripheral surface of the unlocking member, the tooth plate is restricted from the tooth plate in the rotational direction.By inserting the guide protrusion formed on the center wall of the housing in the axial direction into the guide groove formed on the outer circumferential surface of the unlocking member in the axial direction, the unlocking member is restricted from the housing in the rotational direction.When the releasing member is moved toward the housing by the input member by operating the lever, the rotation of the pinion shaft is free because the teeth of the pinion shaft and the teeth of the gear plate are separated from each other by the gear plate moving together with the releasing member.[Effects of the Invention]According to the present invention described above, there is an effect that a seat sagging phenomenon can be prevented because, even if the binding force is reduced by the brake roller, no sliding rotation occurs in the pinion shaft by providing a tooth plate that restricts the pinion shaft in the rotational direction in a locked state of the brake.[Brief Description of Drawings]The following are shown: FIG. 1 is an exploded perspective view of a brake device of a seat for a vehicle according to the present invention. FIG. 2 is a cross-sectional view of the assembled state of FIG. 1. FIG. 3 is a state view of the removed panel cover as a bottom view of FIG. 2. FIG. 4 is a front perspective view of the brake device of a seat according to the present invention. FIG. 5 is a rear perspective view of the brake device of a seat according to the present invention. FIG. 6 is a perspective view showing the assembled state of the tooth plate which is the main structure of the present invention. FIG. 7 is a cross-sectional view showing an assembled state of the tooth plate. FIGS. 8 and 9 are partially cut-away perspective views of the brake device of a seat according to the present invention, FIG. 8 is a view showing a state in which the lever is not operated, and FIG. 9 is a view showing a state in which the lever is operated.[Detailed Description of the Invention]Since the present invention may have various modifications and various embodiments, specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the present invention to particular embodiments, but it is to be understood that all modifications, equivalents and substitutions are included within the spirit and scope of the present invention. The thickness of the lines and the size of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.In addition, the terms to be described later defined in consideration of functions in the present invention may vary according to the intention of the user or operator or the case of precession. Therefore, definitions of these terms should be made based on the contents of this entire present invention.Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.As shown in FIGS. 1 to 3, a brake device of a seat for a vehicle according to the present invention includes the following parts: a housing 10, an input member 20, an unlocking member 30, a brake ring 40, a pinion shaft 50, a brake member 60, a cover plate 70, a cover 90, and a tooth plate 100.Based on the housing 10, the release operating part is constructed on one side consisting of the input member 20 and the release member 30, and on the other side, the brake part consisting of the brake ring 40, the pinion shaft 50, the brake member 60 is constructed.The unlocking operation part serves to unlock the locking state of the brake part according to the operation of a user operated lever (not shown in drawings), and the brake part serves to maintain the height of the seat in the previously set state by maintaining the locking state against the weight of the user and the operation thereof of the seat height adjustment mechanism.The cover plate 70 and the cover 90 are members disposed at the outermost side of the brake device, are accommodated in the space thereof with members constituting the unlock operation part and the brake part, and prevent the members from being separated outward.The input member 20 is connected as a structural member in a generally cylindrical shape to a lever (not shown in drawings) operated by an occupant, and is rotated and operated. The center protrusion 21 formed in the center of the input member 20 is inserted into the protrusion hole 91 of the cover 90 to maintain the rotation center. At the other end part of the input member 20, support parts 22 are formed protruding at opposite positions, respectively, and these support parts 22 are disposed between the first springs 81 installed in the housing 10. Therefore, they are provided so as to be able to return to the original position after the rotational operation by the lever.The unlocking member 30 is inserted inside the input member 20 and is operated in conjunction with the rotational operation of the input member 20 in the axial direction. For this, a trapezoidal sliding groove 31 is formed on the upper surface of the unlocking member 30 (see FIG. 6 ), and accordingly, a trapezoidal sliding protrusion (not shown in drawings) is formed on the inside of the input member 20. In the assembled state, the slide protrusion is inserted into the slide groove 31, and since, when the input member 20 is rotated, the inclined surface of the slide protrusion and the inclined surface of the slide groove 31 slide on each other, the unlocking member 30 compresses the second spring 82 and moves forward toward the housing 10.In the unlocking member 30, a plurality of unlocking protrusions 32 are formed so as to protrude toward the housing 10 at regular intervals along the circumferential direction thereof.A cylindrical center protrusion 11 is formed protruding from the front surface of the housing 10, and on the outer periphery of the center protrusion 11, one end of the second spring 82 is inserted and attached. In this state, the other end of the second spring 82 elastically supports the unlocking member 30 (see FIG. 2 ).The first spring 81 is composed of a pair of left and right, and on the front surface of the housing 10, a spring groove 12 into which the first spring 81 is inserted and located well is formed along the circumferential direction. The support portion 22 of the input member 20 is caught on the end portion of the first spring 81, and therefore, when the input member 20 is rotated by operating the lever, the first spring 81 is compressed, and when the lever operating force is removed, the input member 20 is restored to its original position by the restoring force of the first spring 81.The brake ring 40 is formed together with the pinion shaft 50 with a space for installing and operating the brake member 60.The brake ring 40 is closely disposed on the other side (rear surface) of the housing 10, and the wedge surface 41 aand the release surface 41 bare continuously and repeatedly formed on the inner circumferential surface 41 in the circumferential direction.In the pinion shaft 50, a disk-shaped brake plate 52 is formed on one side of the outer periphery of the shaft 51, and a pinion 53 is formed on one side portion thereof. The pinion 53 meshes with the rack of the seat height adjustment mechanism.An end portion of the shaft 51 of the pinion shaft 50 is inserted into the through hole of the center protrusion 11 of the housing 10 through the brake ring 40 and is located well, at which time the brake plate 52 of the pinion shaft 50 is located inside the through hole of the brake ring 40. Accordingly, a space for installing and operating the brake member 60 is formed between the inner circumferential surface 41 of the through hole of the brake ring 40 and the outer circumferential surface of the brake plate 52 of the pinion shaft 50.In a space for installing and operating the brake member 60, a plurality of brake members 60 are inserted and installed. A brake member 60 is composed of a spring 61 and rollers 62 disposed at both ends of the spring 61. The spring 61 is disposed at the center of the unlocking surface 41 bof the inner circumferential surface 41 of the brake ring 40, and the rollers 62 are disposed so as to be in contact with both ends thereof.In a normal state in which the lever is not operated by the occupant, the brake device is in the lock state, and thereby the rollers 62 on the both sides are pressed by the spring 61 and interposed between the outer circumferential surface of the brake plate 52 and the wedge surface 41 a. As described above, all the rollers 62 are positioned on the wedge surface 41 aand fix the brake plate 52, maintaining a state in which rotation of the pinion shaft 50 is impossible.A cover plate 70 is closely installed on the other side of the brake ring 40. The pinion 53 of the pinion shaft 50 meshes with the rack by protruding to the opposite side through the through hole of the cover plate 70, and the brake plate 52 is caught in the periphery of the through hole of the cover plate 70 in the axial direction. Accordingly, separation of the pinion shaft 50 and the brake member 60 by the cover plate 70 is prevented.Meanwhile, a cover 90 is installed on the front side of the input member 20. The cover 90 is formed as a member in the form of a circular container having a closed side inside which the input member 20 is inserted and well-positioned.On the front side of the cover 90, a protrusion hole 91 is formed, into which the center protrusion 21 of the input member 20 is inserted and well-located.On the cover plate 70, a plurality of joints 71 are formed which are bent and extended toward the cover 90. At the end portion of the connecting piece 71, two sealing protrusions 72 are thus formed protruding.Corresponding to the seal projections 72, on the outer peripheral surface of the cover 90, a pair of support jaws 92 spaced from each other by the width of the connector 71 are formed the same number as the connector 71. In the support jaws 92 on both sides of each pair of support jaws 92, the support surfaces 92a facing each other are formed in the shape of the inclined surface.After the assembly of the other components is completed, the cover plate 70 and the cover 90 are pressed in the direction facing each other, and in this state, the sealing protrusion 72 is sealed and spread in both directions, and the cover 90 is caught on the holding surface 92 aof the holding jaw 92 (see FIG. 4 ). By making the cover plate 70 be made of a metal material and plastically deforming the sealing protrusion 72 by sealing, since a state spread in both sides is maintained, a state caught on the support surface 92 ais maintained firmly and stably.At this time, since a joint 71 is inserted between the both-side support projections 92, movement opposite to the circumferential surface direction between the cover plate 70 and the cover 90 is also prevented. In addition, since a protrusion part 13 is formed on the outer circumferential surface of the housing 10 so as to catch the connector 71 in the circumferential direction, the housing 10, the cover plate 70, and the cover 90 are firmly connected to each other toward the circumferential surface without floating.Front and rear perspective views of a continuously variable brake device assembled as above are shown in FIGS. 4 and 5.In the housing 10, the brake ring 40, and the cover plate 70, a plurality of mounting parts ( 14, 42, and 73) are formed protruding outward in the radial direction at respective same positions, and bolt holes are formed in the respective mounting parts ( 14, 42, and 73) that coincide with each other during assembly.Therefore, the mounting members (14, 42 and 73) can be attached to the cushion frame of the seat using bolts.On the input member 20, a pair of stopper protrusions 24 are formed which are spaced apart from the center protrusion 21 by the same distance in the radial direction. Each stopper protrusion 24 is formed in opposite directions from the center of the center protrusion 21.In the cover 90, a stopper hole 93 into which the stopper protrusion 24 is inserted is formed. The stopper hole 93 is formed in an arc shape having a predetermined length on the same circumferential surface from the center of the protrusion hole 91. Since the stopper protrusion 24 is movable only inside the stopper hole 93, a rotation angle of the input member 20 is limited within the length range toward the circumferential surface of the stopper hole 93. That is, since the operating range of the lever is limited to a certain range, unnecessary excessive operation of the lever is prevented, and thus the forward and rearward movement of the unlocking member 30 can be smoothly and stably performed.In addition, a bung hole 25 may be formed in the stopper protrusion 24, and using the bung hole 25, a lever operated by an occupant may be mounted on the input member 20 with bolts.Meanwhile, the unlocking protrusion 32 of the unlocking member 30 is formed in the same number as the brake member 60. The end edge of the release protrusion 32 is formed with an inclined surface 32 ato be easily inserted between the rollers 62 on both sides of the brake member 60 (see FIG. 6 ).In addition, as shown in FIG. 6, a linear guide groove 32 cis formed on the outer side surface of the unlocking protrusion 32 along the operation direction of the unlocking member 30. The guide groove 32 cmay be formed through the entire body of the unlocking member 30 in the vertical direction.Corresponding to the guide groove 32c, a linear guide protrusion 16a is formed on the inner peripheral surface of the intermediate wall 16 of the housing 10 so as to protrude in the axial direction of the housing 10.In the assembled state, the guide protrusion 16 ais inserted inside the guide groove 32 cof the unlocking member 30 to guide the linear movement of the unlocking member 30 (see FIG. 7 ).The drawing number 15 indicated in FIG. 6 is a protrusion hole 15 through which the unlocking protrusion 32 passes, and since the unlocking protrusion 32 protrudes through the protrusion hole 15 toward the rear surface of the housing 10, the brake member 60 can be operated.In addition, as shown in FIGS. 1 and 2, the present invention includes the tooth plate 100. As a disk-shaped member in the interior of which a circular through hole is formed, the tooth plate 100 is inserted and installed inside the unlocking member 30.As shown in FIGS. 6 and 7, a tooth shape of the saw teeth 110 is formed on the inner circumferential surface of the tooth plate 100, and accordingly, a tooth shape of the saw teeth 54 is formed on the outer circumferential surface of an end part of the shaft 51 of the pinion shaft 50. Since the both-sided tooth shapes of the saw teeth 110 and 54 are combined with each other, the tooth plate 100 is combined in a state that rotation relative to the pinion shaft 50 is impossible and axial movement is possible.In the assembled state, as shown in FIG. 2, the tooth plate 100 is provided with its upper surface in contact with the upper surface of the inner space of the unlocking member 30, and its lower surface supported by the second spring 82. In this state, a combination state of the two tooth shapes of the saw teeth 110 and 54 is maintained.Meanwhile, on the outer periphery of the tooth plate 100, a plurality of protrusion parts 120 are formed protruding outward in the radial direction at equal intervals. FIG. 7 is a view in which three protrusion parts 120 are formed at intervals of 120°. Corresponding to the protrusion 120, the retaining grooves 33 are formed in equal numbers on the inner circumferential surface of the unlocking member 30.In the assembled state, since the protrusion parts 120 are inserted into the respective corresponding support grooves 33 and caught in the circumferential direction, the tooth plate 100 can maintain a stable assembled state with rotation relative to the unlocking member 30 being impossible.Now, the effect and effect of the brake device according to the present invention will be described.When an occupant pulls up the lever located on the seat side, the input member 20 combined with a lever is rotated, and since a sliding protrusion of the input member 20 presses the sliding groove 31 of the unlocking member 30, the unlocking member 30 moves in the axial direction toward the housing 10.Therefore, the unlocking protrusion 32 of the unlocking member 30 protrudes to the inside of the brake ring 40 through the protrusion hole 15 of the housing 10, and at this time, by inserting the unlocking protrusion 32 between the rollers 62 of the brake member 60 adjacent to each other, the rollers 62 on both sides are pressed and moved from the wedge surface 41 ato the unlocking surface 41 b, so the locking state of the brake plate 52 is unlocked by the rollers 62, and it is possible to adjust the height of the seat because the rotation of the pinion shaft 50 becomes free.On the contrary, when the occupant releases the pulled lever, the first spring 81 presses the support part 22 to restore the input member 20 to its original position, and the second spring 82 presses the unlocking member 30 to restore the unlocking member 30 also to the original position.Therefore, since the unlocking protrusion 32 of the unlocking member 30 comes out between the rollers 62 and moves from the unlocking surface 41 bto the wedge surface 41 awhile the rollers 62 are restored to their original positions by the spring 61, the pinion shaft 50 becomes non-rotatable again, and as a result, the operation of a rack of the seat height adjustment mechanism meshed with the pinion 53 is not possible, so that the height of the seat is maintained in an adjusted state.Meanwhile, when an excessive load exceeding the braking force of the rollers 62 is continuously and repeatedly applied, sliding occurs between the roller 62 and the brake plate 52, and rotation occurs in the pinion shaft 50, and thereby a seat sagging phenomenon may occur in which the height of the seat cushion is decreased.However, in the present invention, a seat sagging phenomenon can be prevented because rotation of the pinion shaft 50 is prevented by the tooth plate 100.The state in which the braking action by the rollers 62 occurs is a normal state in which the occupant does not operate the lever, and is the same state as in FIGS. 2 and 8. At this time, while the unlocking member 30 is moved toward the cover 90 by the second spring 82, the tooth shape of the saw teeth 54 of the pinion shaft 50 and the tooth shape of the saw teeth 110 of the rack plate 100 are combined with each other because the rack plate 100 is positioned on the same line with the tooth shape of the saw teeth 54 of the pinion shaft 50.The housing 10 is fixed to the cushion frame, wherein rotation of the unlocking member 30 relative to the housing 10 is restricted by a combination of the guide protrusion 16 aand the guide groove 32 c, and since rotation of the tooth plate 100 relative to the unlocking member 30 is restricted by the combination of the protrusion part 120 and the support groove 33, rotation of the pinion shaft 50 relative to the tooth plate 100 is restricted by the combination of the tooth shape of the saw teeth 54 and the tooth shape of the saw teeth 110.That is, even if the locking state is weakened by the roller 62 as described above by maintaining the locking state of the pinion shaft 50 by the tooth plate 100, since the rotation of the pinion shaft 50 is suppressed, a seat sagging phenomenon can be prevented.Meanwhile, when the occupant operates the lever to adjust the seat height, the input member 20 is rotated and the unlocking member 30 is moved toward the housing 10, and since the tooth plate 100 is located inside the unlocking member 30, as shown in FIG. 9, the tooth plate 100 moves toward the housing 10 together with the unlocking member 30, and the tooth shape of the saw teeth 110 of the tooth plate 100 is separated from the tooth shape of the saw teeth 54 of the pinion shaft 50.Therefore, a binding force of the rotation by the tooth plate 100 does not act, and since in this state, a locking state of the rotation due to the rollers 62 is also unlocked by the unlocking protrusion 32, the height of the seat can be set normally while the pinion shaft 50 is in a free state of the rotation.That is, although seat sagging is prevented by the tooth plate 100 more reliably suppressing the rotation of the pinion shaft 50 in a normal seat use state, an operation of seat height adjustment is not disturbed in that the rotation of the tooth plate is not restricted because the tooth plate is separated from the pinion shaft 50 in a state where the occupant operates the lever to adjust the seat height.[List of Reference Numerals]10 Housing 11 Center protrusion 12 Spring groove 13 Protrusion part 14 Mounting part 15 Protrusion hole 16 Intermediate wall 16 a Führungs protrusion 20 Input member 21 Center protrusion 22 Support part 24 Stopper protrusion 25 Bung hole 30 Unlocking member 31 Slide groove 32 Unlocking protrusion 32 a Geneigte surface 32 c Groove 33 Support groove 40 Brake ring 41 Inner peripheral surface 41 a Keil surface 41 b Entriegelungs surface 42 Mounting part 50 Pinion shaft 51 Shaft 52 Brake plate 53 Pinion 54 Tooth shape 60 Brake member 61 Spring 62 Roller 70 Cover plate 71 Connection piece 72 Sealing protrusion 73 Mounting part 81 First spring 82 Second spring 90 Cover 91 Protrusion hole 92 Support shoe 92 a Support surface 93 Stopper hole 100 Tooth plate 110 Tooth shape 120 Protrusion part

Claims

A braking device of a seat for a vehicle, characterized by comprising: an input member (20) that is rotated and connected to a lever (10) that the occupant operates; an unlocking member (30) that is pushed and moved by rotation of the input member (20) in the axial direction; a housing (70) on one side of which the input member (20) and the unlocking member (30) are installed; a brake ring (40) that is mounted on the other side of the housing (70); a pinion shaft (50) that is rotatably installed in the housing (70) through the brake ring (40); a brake member (60) that is installed between the brake ring (40) and the pinion shaft (50) to restrict or release the locked state of the pinion shaft (50) from the brake ring (40); and a tooth plate (100) installed on the unlocking member (30) to restrict rotation of the pinion shaft (50).The brake device of a seat for a vehicle according to claim 1, characterized in that the tooth shape (110) formed on the inner circumferential surface of the tooth plate (100) meshes with the tooth shape (54) formed on an end part of the pinion shaft (50).The braking device of a seat for a vehicle according to claim 2, characterized in that the tooth shape (110) of the tooth plate (100) and the tooth shape (54) of the pinion shaft (50) are mutually restricted in the circumferential direction and are freely separated in the axial direction.The braking device of a seat for a vehicle according to claim 1, characterized in that the tooth plate (100) is inserted inside the unlocking member (30), the upper surface of the tooth portion (110) is in close contact with the upper surface of the inner space of the unlocking member (30), and the lower surface of the tooth portion (110) is in contact with and supported by a second spring (82) that elastically supports the unlocking member (30) in the opposite direction of the housing (70).The braking device of a seat for a vehicle according to claim 1, characterized in that a plurality of protrusion parts (120) are formed on the outer circumferential surface of the tooth plate (100), wherein, since the protrusion parts (120) are inserted into the locking grooves (32c) formed on the inner circumferential surface of the unlocking member (30), the tooth plate (100) is restricted from the tooth plate (100) in the rotational direction.The braking device of a seat for a vehicle according to claim 1, characterized in that, by inserting the guide protrusion (16a) formed on the center wall (16) of the housing (70) in the axial direction into the guide groove (32) formed on the outer circumferential surface of the unlocking member (30) in the axial direction, the unlocking member (30) is restricted from the housing (70) in the rotational direction.The braking device of a seat for a vehicle according to claim 3, characterized in that, when the unlocking member (30) is moved toward the housing (70) by the input member (20) while the lever (10) is operated, the rotation of the pinion shaft (50) is free because the teeth (54) of the pinion shaft (50) and the teeth (110) of the tooth plate (100) are separated from each other by the tooth plate (100) moving together with the unlocking member (30).

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