KR20110054714A - Dial type seat height holding device - Google Patents

Abstract

PURPOSE: A device for fixing the height of a dial type seat is provided to generate strong brake force since a roller is inserted between wedge type counterparts coupled with a brake wedge. CONSTITUTION: A device for fixing the height of a dial type seat comprises a front housing(1), a rear cover(2), and an actuating unit. A shaft hole(1a) is punched at the center of the front housing, and a space is formed therein. A fixing boss of the rear cover is inserted into the front housing. A shaft hole is punched at the center of the rear cover, and the rear cover is coupled with the front housing. The actuating unit adjusts the height of the seat by rotating a sector gear of a seat link. The actuating unit comprises an unlocking block(4) and a pinion gear unit. The unlocking block passes through the shaft hole. The pinion gear unit rotates the link sector gear to move the link up and down for the adjustment of the seat height.

Description

Dial type seat height holding device

The present invention relates to a seat height fixing device, and more particularly to a dial type seat height fixing device that generates a high brake force using a wedge structure.

Seats, which are seat seats that are generally installed in the front and rear of the interior of a vehicle, are equipped with various convenience devices for the comfort of the passengers.

For example, the sliding function that can be pushed and pulled back and forth according to the passenger's body shape, and the lifting function to move the seat up and down depending on the situation, as well as the reclining to adjust the inclination of the seat back ) Functions.

In addition, there is also a height adjustment device for seat elevation function to adjust the height of the seat to fit the passengers.

In one example, the pumping device (Pumping Device) is connected to the power transmission to the link means of the seat cushion in the seat cushion, and is operated using a lever provided on the outside of the power seat seat cushion in accordance with the external operating force input.

The pumping device is mainly composed of a clutch unit and a brake unit, and the clutch unit functions to transfer external input to the link means of the seat cushion, and the brake unit provides a link unit that has been operated. It acts to fix.

The pumping device as described above has the convenience of operation through lever operation, but the structure is complicated and the price is high, so that a high cost burden is applied to a low-cost vehicle.

In contrast to the pumping device, the brake drum type as a dial type includes only a brake unit that fixes the link means of the seat cushion, and thus has a simple structure and a low manufacturing cost, which is economical and suitable for application to a low-cost vehicle.

The dial type as described above has a structure that provides a brake force by using a friction force between the brake drum and the torsion coil spring type brake spring, so that each brake spring is provided in the up / down direction, and the brake drum contact area is large. The outside is applied in the down direction to perform the brake function, and the inside is applied to the up direction to perform the brake function.

However, since the brake force generating structure applied to the dial type utilizes a friction force between the brake spring and the drum, the brake force has a fundamental limitation of weak strength.

In addition, in the dial type, the pinion gear portion connected to the link side of the seat cushion is connected to the brake spring side, thereby forming a gap between the outside and the inside, thereby causing backlash.

Accordingly, the present invention has been made in view of the above, and by forming a pinch with a roller positioned between the wedge type counterparts coupled with the brake wedge to generate a brake force, a strong strength brake force can be generated. It is an object to provide a dial type seat fixing device.

In addition, the present invention is further provided with a friction member for generating another brake force between the space of the wedge-type mating parts to be pinched between the brake drum and the roller, so that the back drive (Back drive) even in the external force or impact generated from the outside The purpose is to provide a dial-type seat height fixing device that can improve the phenomenon and realize smooth operation.

In addition, the present invention by forming a brake force using a separate friction member together with the brake force using the brake wedge and roller and wedge (Wedge) structure, the price competitiveness is excellent while realizing the same performance as the pumping device (Pumping Device) In addition, it is an object of the present invention to provide a dial type seat height fixing device that can provide a high operating convenience compared to a passive type (Passive Type).

In addition, the present invention, while forming a brake force using a separate friction member together with the brake force using the brake wedge and the roller and wedge (Wedge) structure, by adding a reduction gear structure to the brake release portion, the link side link It is an object of the present invention to provide a dial type seat height fixing device that can realize excellent operating force even at a small ratio.

The present invention for achieving the above object, the dial type seat height fixing device and the rear cover which is coupled to the front housing by drilling the shaft hole at the center position and forming a space therein, and the center hole in the center position; And an actuating means for forcibly rotating the sector gear of the seat-side link by the rotational force input from the front housing side to adjust the seat height, and generating a brake force for switching the link to a fixed state by using friction force when the rotational force input is released. Characterized in that configured.

The front housing is coupled to each other by fitting the high information of the rear cover.

The actuating means includes an unlocking block having a handle shaft for receiving rotational force from the outside of the front housing through the shaft hole drilled at the center position and the link side sector gear to adjust the seat height by rotating the link gear. The pinion gear unit is forcibly rotated through the unlocking block.

The unlocking block has at least one protruding leg in a direction opposite to the handle shaft along the edge of the body having a handle shaft in the center position to apply a rotational force from the outside.

The pinion gear unit includes a gear wedge having a brake wedge forcibly rotated by the rotational force of the unlocking block, an output gear meshed with a link side sector gear outside the rear cover in a state of being splined to the shaft center of the brake wedge, and It is composed of a plurality of rollers positioned on the brake wedge to generate the brake force by friction.

The brake wedge protrudes to the outer circumferential surface of the body to form at least one wedge boss for positioning the rollers, and protrudes the outer circumferential surface rim of the body forming the wedge boss to move the restraint of the brake wedge. Form a frictional force that prevents rotation.

The roller wraps the width of the wedge boss and is positioned at both sides of the insert spring and both sides of the insert spring, respectively, and is pushed to the edge of the protruding body outer peripheral surface of the brake wedge by an elastic force applied from both sides. It consists of a 1st roller shaft and a 2nd roller shaft.

The roller releases the braked state by the wedge principle using the protruding leg of the unlocking block, and in the released state, the roller rotates the wedge boss side of the brake wedge.

The roller compresses an insert spring located between the first and second roller shafts when the brake wedge is rotated, and the insert spring is spaced on both sides of the wedge boss of the brake wedge which is not in contact with the first and second roller shafts. Is accepted.

The distance between the first and second roller shafts is formed to be narrower than the width of the protruding legs of the unlocking block.

The brake wedge further includes a frictioner that applies an elastic force to restrain the brake wedge, and the friction wedge is inserted to have a frictional force with a seating groove formed on the side surface of the brake wedge while being fixed to the rear cover side.

The frictioner has contact protrusions that fold and protrude at a predetermined interval on the annular ring body surface, and a fixing pin that protrudes from the body surface between the contact protrusions.

And a reduction gear unit configured to generate an output for rotating the unlocking block by applying a force to rotate the handle shaft between the handle shaft and the unlocking block.

The reduction gear part has a coaxial with the handle shaft and a pinion gear provided at an end thereof, a diameter larger than that of the pinion gear and a number of teeth, and concentrically with respect to the axial center of the unlocking block so that the pinion gear is engaged. It consists of internal gear formed in

The shaft hole of the front housing through which the handle shaft penetrates is drilled at an eccentric position in the central position.

According to the present invention, since the brake force using the brake wedge, the roller and the wedge (Wedge) structure together with the brake force using a separate friction member is formed in duplicate, it has a high brake force strength and compared to the pumping device (Pumping Device) Competitiveness and excellent operation convenience compared to the passive type (Passive Type).

In addition, since the present invention forms a dual brake force can improve the back drive phenomenon even in the external force or shock generated from the outside, it has the effect of smoothly implementing the operation.

In addition, since the present invention further adds a speed reducer structure to the brake release portion, even if the link ratio of the link side is small, there is an effect that can implement excellent operating force.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

The dial-type seat height fixing device of the present invention changes the seat height by rotating the sector gear side of the link by applying a clockwise or counterclockwise rotational force, and then releases the rotational force by the friction force using the wedge structure. To adjust the seat height by forming a strong brake force to keep the link fixed.

Figure 1 shows an exploded perspective view of a dial type seat height fixing device according to the present invention.

As shown, the dial-type seat height fixing device is coupled to the front housing 1 through the front housing (1) through the shaft hole (1a) in the center position to form a space therein, and through the shaft hole (2a) in the central position To adjust the seat height by forcibly rotating the sector gear of the seat-side link by the rotational force input from the rear cover 2 and the front housing 1, and converting the link to the fixed state by using the friction force when the rotational force input is released. It consists of an actuating means for generating a brake force.

The actuating means has a structure arranged at the center of the shaft by using shaft holes 1a and 2a drilled at the center positions of the front housing 1 and the rear cover 2, respectively.

In this embodiment, the front housing (1) and the rear cover (2) are coupled to each other via a fixing pin (2c), for this purpose to form a side flange (1b) for drilling holes on both sides of the front housing (1) Then, the side flange (2b) formed in the rear cover (2) forms a structure having a high information (2c).

The operating means according to the present embodiment includes an unlocking block 4 having a handle shaft 3 protruding out of the front housing 1 through a shaft hole 1a so as to receive rotational force at a central position, and a sector gear. The pinion gear unit is forcedly rotated through the unlocking block 4 to adjust the seat height by rotating and raising or lowering the link, and the pinion gear unit is in close contact with the pinion gear unit to form a frictional force. It consists of a frictioner 20 to improve the back drive phenomenon.

The unlocking block 4 has a plurality of protruding legs 4a in a direction opposite to the handle shaft 3 along the rim of the body having the handle shaft 3 at the center position, and the protruding legs 4a have a pinion. It wraps around the gear unit.

The handle shaft 3 has a structure in which a gear is formed in the axial direction, and receives a rotational force applied in a state in which an external lever or a rotary dial is coupled.

The six protruding legs 4b of the unlocking block 4 are formed at intervals of 60 ° K, the width of which is greater than the interval between the paired rollers 10, and forms a chamfered tip portion thereof.

The pinion gear unit has a brake wedge (5) which forms a brake force by a frictional force using a wedge structure and is forcibly rotated by the rotational force of the unlocking block (4), and is coupled to the shaft center of the brake wedge (5). A gear shaft 6 having an output gear 7 engaged with the link-side sector gear outside the rear cover 2, and a plurality of rollers positioned on the brake wedge 5 to generate friction by generating friction force ( It consists of 10).

The brake wedge (5) forms a wedge boss (5a) protruding to the outer peripheral surface of the rim of the body through the spline hole (5b) in the axial center position, the wedge boss (5a) has a predetermined interval K and width It consists of 6 pieces, for example, at intervals of 60 °.

In addition, the brake wedge 5 is provided with a recessing groove 5c for inserting the frictioner 20 in close contact with the inner surface on one side thereof, and the brake wedge 5 faces the rear cover 2 in the assembled state. The seating groove 5c is formed on the surface to be fitted and fixed at the rear cover 2 side.

The wedge boss 5a according to the present embodiment has a structure in which the roller 10 is positioned on both sides, which is shown in FIG.

As shown, the roller position surface 5d for positioning the roller 10 on the outer circumferential surface of the brake wedge 5 is formed on both sides of the wedge boss 5a, and between the roller position surfaces 5d. The convex protrusion 5e is formed to protrude convexly to increase the outer diameter of the body.

The restraint section surface 5e as described above reduces the distance between the body outer circumferential surface of the brake wedge 5 and the inner circumferential surface of the front housing 1 to implement a wedge action with the roller 10, thereby providing a strong brake force. Will be able to redeem.

The gear shaft 6 according to the present embodiment has a spline shaft 6a having a spline formed on one side thereof, and an extension shaft 6b having an output gear 7 engaged with the link side sector gear on the opposite side thereof. Has a structure with

Therefore, when the gear shaft 6 is assembled, the spline shaft 6a is coupled to the spline hole 5a of the brake wedge 5, and the extension shaft 6b is the shaft hole 2a of the rear cover 2. The output gear 7 is engaged with the link side sector gear outside the rear cover 2 through the pipe.

The roller 10 according to the present embodiment is positioned between the paired first and second roller shafts 10a and 10b and the first and second roller shafts 10a and 10b so that the roller 10 It consists of the insert spring 10c which pushes out the 2nd roller shaft 10b, respectively.

The shaft length A of the first and second roller shafts 10a and 10b is made longer or the same length as the width a of the brake wedge 5, and may be appropriately changed as necessary.

The insert spring 10c surrounds the wedge boss 5a of the brake wedge 5 and has a structure for pushing the first and second roller shafts 10a and 10b positioned on both sides thereof. Make it.

Due to this, when assembled to the roller position surface 3b on the side of the wedge boss 5a of the brake wedge 5, the first and second roller shafts 10a and 10b that are pushed out of the insert spring 10c are in roller position. By constraining the movement through the constraining section surface 5e protruding from the surface 5d, the rotation of the brake wedge 5 can be constrained.

The frictioner 20 according to the present embodiment is provided with a contact protrusion 20a which is folded and protruded at a predetermined interval on the annular annular body surface 20b, and between the contact protrusions 20a at the body surface 20b. A structure having a protruding fixing pin 20c is achieved.

Figure 2 shows the state of engagement of the primer 20 in the assembled state.

As shown, the frictioner 20 is in close contact with the contact projection 20a to the inner surface of the seating groove 5c of the brake wedge 5 to form a friction force, the fixing pin 20c is the rear cover (2) Is inserted into the fixing hole (2d) of the to maintain a fixed state.

In this embodiment, the entire diameter of the friction 20 is to have a diameter larger than the inner diameter of the seating groove 5c of the brake wedge 5, thereby reducing the diameter of the frictioner 20 to seat the mounting groove 5c. Is fitted on.

Due to this assembly method, the frictioner 20 can restrain the brake wedge 5 more strongly by using an elastic force, which can abruptly loosen the brake wedge 5 when adjusting external force or shock or seat height. While suppressing, it implements the action to improve the back drive phenomenon of the meshing gear.

As described above, the dial type seat height fixing device according to the present embodiment applies a clockwise or counterclockwise rotation toward the unlocking block 4 protruding out of the front housing 1 coupled to the rear cover 2. By rotating the gear shaft 6 generated together with the brake wedge 5 by the rotational force through the locking block 4, the link side sector gear is operated to adjust the seat height.

Figure 2 shows the assembled state of the dial type seat height fixing device according to this embodiment.

As shown, the high housing 2c of the rear cover 2 is coupled to the front housing 1 so that the handle shaft 3 of the unlocking block 4 can exert an external force to the front housing 1. Protrudes outward from the inner space, and the output gear 7 portion of the gear shaft 6 protrudes out of the rear cover 2 to be engaged with the sector gear side of the link.

The brake wedge 5 having the roller 10 positioned therein is coupled to the inside of the unlocking block 4, and the spline hole 5a of the brake wedge 5 is connected to the gear shaft via the spline shaft 6a. (6) is coupled, the frictional 20 is fitted into the fixing hole (2d) of the rear cover (2) is positioned in the seating groove (5c) of the brake wedge (5).

Figure 3 shows the assembly cross section of the roller portion of the dial-type seat height fixing device according to this embodiment.

As shown, the protruding leg 4a of the unlocking block 4 is located between the wedge bosses 5a of the brake wedge 5, and the wedge boss 5a has an "M" shaped insert spring 10c. In this fitted state, the first roller shaft 10a and the second roller shaft 10b are positioned on both sides thereof.

When the assembly is made, the first roller shaft 10a and the second roller shaft 10b pushed out by the insert spring 10c are positioned toward the restraint section surface 5e out of the roller position surface 5d and thus, the first roller shaft 10a and the second roller shaft 10b. The first roller shaft 10a and the second roller shaft 10b form a friction force between the brake wedge 5 and the front housing 1.

When the external rotational force is input in the above state, the protruding leg 4a of the unlocking block 4 moves the first roller shaft 10a or the second roller shaft 10b according to the rotational direction of the wedge boss 5a. Rotate the brake wedge (5) while pushing it toward you.

The rotational force applied to the handle shaft 3 from outside to adjust the seat height rotates the unlocking block 4, and the rotating unlocking block 4 presses the roller 10 with the protruding legs 4a. Rotate the brake wedge 5 in the same direction.

As the rotation Mb of the brake wedge 5 rotates the spline-coupled gear shaft 6 together, the output gear 7 coupled to the gear shaft 6 also rotates Md.

Fig. 4 shows the cross-sectional state of the unlocking block 4, the brake wedge 5, the roller 10 and the gear shaft 6, which are rotated counterclockwise according to this embodiment.

As shown, since the protruding legs 4b strongly push the second roller shaft 10b toward the rotation Ma of the unlocking block 4 through the handle shaft 3, the second roller shaft 10b. Is pushed out while compressing the insert spring 10c.

If the movement of the second roller shaft 10b as described above continues through the unlocking block 4 even after the insert spring 10c is compressed, the rotational force of the unlocking block 4 is braked through the wedge boss 5a. The rotation Mb of the wedge 5 is switched.

The rotation Mb of the brake wedge 5 is continuously transmitted to the spline-coupled gear shaft 6 to rotate together, and the rotation Mc of the gear shaft 6 engages the output gear 7 engaged with the sector gear side of the link. By rotating Md again, the link height with the sector gear is raised or lowered according to the rotation direction to adjust the seat height.

When the external force is released after adjusting the seat height as described above, the roller 10 is returned to its initial state and the unlocking block 4 is returned to its original position to form a friction force between the brake wedge 5 and the front housing 1. This frictional force acts as a brake force restraining the brake wedge 5 to block the rotational force applied to the brake wedge 5 through the gear shaft 6 from the link side.

 3 shows the friction force formation state between the unlocking block 4, the brake wedge 5 and the roller 10 according to the present embodiment.

As shown, the second roller shaft 10b subjected to the elastic restoring force of the insert spring 10c that has been compressed when no external force is applied, pushes the protruding leg 4b and unlocks due to the protruding leg 4b being pushed out. The block 4 is rotated in the opposite direction to return to the initial state.

When the insert spring 10c is restored to the initial state and the unlocking block 4 is also returned to the initial state, the first roller shaft 10a and the second roller shaft 10b constituting the roller 10 are restrained sections, respectively. By moving toward the surface 5e, the brake wedge 5 is applied to the brake wedge 5 with a strong braking force according to the wedge action between the roller 10 and the brake wedge 5 and the front housing 1.

The strong restraint force of the brake wedge 5 blocks the rotational force exerted on the brake wedge 5 through the gear shaft 6 from the link side, so as to maintain the height adjusted seat state.

On the other hand, the frictioner 20 applied in this embodiment is inserted into the seating groove 5c of the brake wedge 5 as shown in Figure 2 by restraining the brake wedge 5 by strong friction action with its inner surface, brake wedge (5) and the gear shaft (6) to prevent sudden rotation.

Such conditions are when sudden rotational force is applied to adjust the seat height, a strong load is transmitted from the seat side, or a strong impact from the outside is applied to the brake wedge 5 and the gear shaft 6.

At this time, the frictioner 20 reduces the back drive phenomenon of the engaging portion by holding the brake wedge 5 and the gear shaft 6 with a friction force, and smoothly implements the operation.

On the other hand, the present invention can be variously modified seat height fixing device, Figure 5 shows a modification of the side for inputting the rotational force from the outside.

As shown, another embodiment of the present invention is to implement the same action with a small size of the external operating force, for this purpose the handle shaft 3 and the unlocking block (4) side to which the external operating force is applied Deformation, the configuration including the brake wedge 5 is coupled to the unlocking block (4) does not deform.

That is, by adding the reduction gear unit to the handle shaft 3 and the unlocking block 4 side, the brake wedge 5 side is configured to deliver an external input by force.

The reduction gear part has a coaxial with the handle shaft (3) and the pinion gear (30) provided at the end thereof, and the inside of the body rim concentrically with respect to the axis center of the unlocking block (4) so that the pinion gear (30) is engaged. It consists of an internal gear 40 formed in.

The internal gear 40 may be transformed into an external gear formed along the body edge of the unlocking block 4.

The diameter and the number of gear teeth of the pinion gear 30 are designed in consideration of the diameter and the number of gear teeth of the internal gear 40, and the design factor is considered as the rotation angle of the internal gear 40 by one rotation of the pinion gear 30. do.

Since the handle shaft 3 is eccentric with respect to the shaft center of the unlocking block 4 due to the engagement of the pinion gear 30 and the internal gear 40, the shaft hole 1a of the front housing 1 is handle shaft ( Considering the position of 3), it is formed at the position eccentric to the center position.

6 is an assembled cross-sectional view of a seat height fixing device having a reduction gear unit according to the present modified embodiment.

As shown, the gear shaft 6 exiting toward the rear cover 2 coincides with the axis center of the rear cover 2, but the handle shaft 3 exiting toward the front housing 1 is the front housing 1 shaft. It has a position eccentric with respect to the center.

When the pinion gear 30 provided at the end of the handle shaft 3 rotated by the external rotational force Maa rotates, the meshed internal gear 40 rotates by the rotation of the pinion gear 30.

Since the rotation Mbb of the internal gear 40 as described above is output at the designed power ratio of the pinion gear 30 and the internal gear 40, the unlocking block 4 also has a small external force applied to the handle shaft 3. The output can be made larger.

The rotation Mbb of the unlocking block 4 rotates the brake wedge 5 while pressing the roller 10 through the protruding leg 4b, and the brake wedge 5 has a gear shaft 6 and an output gear. Rotate (7) continuously to engage the link side with the interlocking sector gear to adjust the seat height.

As described above, the reduction gear unit applied to another modified embodiment generates a boosted output even when a small force is applied from the outside, thereby providing more convenient operability, and particularly, even in a structure with a small link ratio.

1 is an exploded perspective view of a dial-type seat fixing device according to the present invention

Figure 2 is an assembled cross-sectional view of the dial-type seat height fixing device according to the present invention

3 is a brake side cross-sectional view of FIG.

Figure 4 is a cross-sectional view of the rotary state of the dial type seat height fixing device according to the present invention

5 is a configuration diagram showing a modification of the dial type seat height fixing device according to the present invention

6 is a cross-sectional view of the assembly according to FIG.

    <Description of the symbols for the main parts of the drawings>

1: Front housing 1a, 2a: Shaft hole

1b, 2b: Side flange 2: Rear cover

2c 、 20c: fixing pin 2d: fixing hole

3: Handle shaft 4: Unlocking block

4a: protruding leg 5: brake wedge

5a: Wedge Boss 5b: Spline Hole

5c: Seating groove 5d: Roller position surface

5e: Constraint section plane

6: gear shaft 6a: spline shaft

6b: Extension shaft 7: Output gear

10: roller

10a, 10b: 1st and 2nd roller shaft 10c: insert spring

20: Frictioner 20a: contact protrusion

20b: Body surface 30: Pinion gear

40: Internal Gear

Claims (16)

The front housing which drills the shaft hole at the center position to form a space therein, the rear cover which is coupled to the front housing through the shaft hole at the center position, and the sector gear of the link link to the seat with the rotational force input from the front housing side. And seating means for adjusting the seat height and generating a brake force for switching the link to a fixed state by using friction force when the rotational force input is released. The dial type seat fixing device according to claim 1, wherein the front housing is coupled to each other by fitting high information of the rear cover. The method according to claim 1, wherein the operating means is through the shaft hole drilled in the center position and the unlocking block having a handle shaft for receiving the rotational force from the outside of the front housing to the center position, and by rotating the link side sector gear to raise or lower the link Dial-type seat height adjustment device, characterized in that consisting of the pinion gear unit forcibly rotated through the unlocking block to adjust the seat height. 4. The dial-type seat fixing device according to claim 3, wherein the unlocking block has at least one protruding leg in a direction opposite to the handle shaft along an edge of the body having a handle shaft at a central position that exerts a rotational force from the outside. 5. . 4. The pinion gear unit of claim 3, wherein the pinion gear unit includes a brake wedge forcibly rotated by the rotational force of the unlocking block, and an output gear meshed with the link side sector gear outside the rear cover in the state of being splined to the shaft center of the brake wedge. A dial type seat fixing device comprising a gear shaft and a plurality of rollers positioned on the brake wedge to generate a brake force by friction. The method according to claim 5, wherein the brake wedge is projected to the outer peripheral surface of the rim of the body, to form at least one wedge boss for positioning the roller, the movement of the roller located by protruding the outer circumferential surface rim formed between the wedge boss Dial-type seat height fixing device, characterized in that to form a friction force to prevent the rotation of the brake wedge by restraint. The method according to claim 6, wherein the roller wraps around the width of the wedge boss insert springs having both side portions and the insert spring is located on both sides of the insert spring, respectively, protruding body outer peripheral surface of the brake wedge with an elastic force applied from both sides A dial-type sheet fastening device comprising a first roller shaft and a second roller shaft pushed to an edge portion. The pumping ball type sheet according to claim 7, wherein the roller releases the brake state by the wedge principle using the protruding leg of the unlocking block, and the roller rotates the wedge boss side of the brake wedge in the released state. Height fixing device. The wedge of the brake wedge of claim 8, wherein the roller compresses an insert spring positioned between the first and second roller shafts when the roller wedge is rotated, and the insert spring is not in contact with the first and second roller shafts. Pumping ball type seat height adjustment device, characterized in that accommodated in the space on both sides of the boss. The pumping ball type seat fixing device according to claim 7, wherein the distance between the first and second roller shafts is narrower than the width of the protruding leg of the unlocking block. 6. The dial-type seat fixing device according to claim 5, wherein the brake wedge further includes a frictionr that applies an elastic force to restrain the brake wedge. 12. The dial-type seat fixing device according to claim 11, wherein the frictioner is inserted to have a friction force with a seating groove formed on the side surface of the brake wedge while being fixed to the rear cover side. The dial-type seat height fixing device according to claim 12, wherein the frictioner includes a contact protrusion protruding from the annular ring-shaped body surface at a predetermined interval and a fixing pin protruding from the body surface between the contact protrusions. 4. The dial type seat fixing device according to claim 3, further comprising a reduction gear unit configured to generate an output between the handle shaft and the unlocking block to rotate the unlocking block by applying a force to rotate the handle shaft. . The pinion gear of claim 14, wherein the reduction gear portion is coaxial with the handle shaft and has a larger diameter and larger number of teeth than the pinion gear, and has a larger number of teeth than the pinion gear. Dial-type seat fixing device, characterized in that the inner gear consisting of a concentric circle formed inside the body rim. 16. The dial-type seat fixing device according to claim 15, wherein the shaft hole of the front housing through which the handle shaft penetrates is drilled at an eccentric position in the central position.

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