KR101582692B1

KR101582692B1 - Pumping ball type seat height holding device

Info

Publication number: KR101582692B1
Application number: KR1020090111464A
Authority: KR
Inventors: 김재호
Original assignee: 주식회사다스
Priority date: 2009-11-18
Filing date: 2009-11-18
Publication date: 2016-01-05
Also published as: KR20110054712A

Abstract

The pumping ball type seat according to the present invention has a height and a height of the gear teeth. The mounting knob 3, which transmits the rotational force from an external handle lever, is input at a position deviated from the center of the shaft. The force transmission path using the frictional force is formed coaxially with the shaft center to reduce the related parts of the clutch so as to simplify the constitution and to facilitate the workability of the parts. The rotation of the brake drum 1 and the brake wedge The gear shaft 12 engaged with the sector gear of the seat side link can be rotated to adjust the seat height by releasing the wedge action of the brake roller 14 located between the seat side link 11 and the seat side link.

Ball, pumping device, axial direction

Description

[0001] The present invention relates to a pumping ball type seat height holding device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a seat height fixing apparatus, and more particularly, to a pumping ball type seat height fixing apparatus in which an external force is transmitted axially to simplify a relative part structure.

Generally, a seat, which is a seat for a chair installed in front of and behind the inside of a vehicle, has various kinds of convenience devices for the comfort of a passenger.

For example, in addition to a sliding function that can be adjusted by pushing and pulling the seat back and forth depending on the body shape of a passenger, a reclining function is provided to adjust the inclination of the seat with respect to the seat backrest, ) Function.

In addition to this, a seat height fixing device for adjusting the height of the seat so as to adjust the height of the seat to the passenger is also provided.

The above-mentioned seat height and style value have various methods according to the operation method thereof. For example, there is a pumping device called a pumping ball type.

The pumping device is a method of adjusting the seat height by transmitting a force toward a link mounted on a seat by using an operation of UP or DOWN of a lever provided on the seat side.

This pumping device is largely composed of a clutch unit and a brake unit, which serves to transmit an external input to the link side of the seat, and the brake unit has a fixed state .

As described above, due to the nature of transmitting the external input, the clutch unit effectively transmits the external input to the link side to keep the operation smooth, so that a large number of parts are associated with each other for effective force transmission to have a structurally complicated configuration.

For example, this type of clutch unit has a roller type clutch unit having a force transmission path in the circumferential direction for releasing the braking force to the brake unit side.

When the roller type clutch unit is pushed in a circumferential direction by a roller arranged coaxially with rotation through a lever, the roller causes a wedge action with the inner wall of the clutch drum which receives the roller to rotate the clutch drum give.

The rotation of the clutch drum as described above is switched by the rotational force of the brake wedge.

The brake wedge rotates the spline-coupled gear shaft to bring the link side sector gear engaged with the gear provided in the gear shaft into a forced rotation state, and the height of the link is controlled by the rotation of the sector gear.

However, since the roller type clutch unit adopts a path for transmitting the force in the circumferential direction about the shaft center when releasing the brake unit, the complexity of the structure is further increased and the workability is difficult, which causes the cost increase.

In addition, this force transmission path structure has to be formed with a contact surface for force transmission as a circumferential surface, and it is necessary to provide a separate relative part for increasing the number of parts, which causes a further increase in cost increase.

Accordingly, the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method of transmitting a rotational force in a circumferential direction by releasing a braking action on a brake side by forming a force transmission path using a frictional force- The present invention provides a pumping ball type seat height fixing device that simplifies the configuration by reducing the clutch-related parts.

It is another object of the present invention to provide a pumping ball type seat height fixing device that can simplify the structure of the clutch-related parts by using a force transmission path having a shaft center and a coaxial shape, .

To achieve the above object, according to the present invention, there is provided a pumping ball type seat height fixing apparatus, comprising: a brake drum coupled to a rear cover to form an internal space;

A mounting knob for transmitting a rotational force applied from an external handle lever to an inside of the brake drum at a position off the axis of the brake drum;

A clutch unit which forms a friction force by rotation through the mounting knob and is rotated with a force transmission path formed coaxially with the axis center of the brake drum;

A brake unit for rotating the sector gear of the seat side link to adjust the seat height by releasing the wedge action with respect to the brake drum by rotation through the clutch unit side;

And a control unit.

The mounting knob is positioned on a pair of guide slots formed on both sides of the center position of the brake drum.

The brake drum and the rear cover each have a shaft hole drilled around the shaft, thereby positioning the clutch unit and the brake unit on the shaft center line.

The clutch unit includes a spring stopper fixed to the brake drum from the inside of the brake drum, a spring for returning to the initial state after operation, a spring for deforming the spring when rotated through the mounting knob, And a clutch retainer having a ball in contact with the clutch wedge plate for output to the unit side.

The spring is composed of a clutch spring elastically supported between the spring stopper and the clutch retainer, and a lever spring elastically supported by the spring stopper and the clutch wedge plate, and is positioned toward a region bisecting the axis center of the spring stopper.

The clutch wedge plate is provided with a pair of wedge wings protruding to positions opposed to each other at a rim, a fixing hole drilled to sandwich a mounting knob on both sides of a shaft hole at a central position, and a ball groove formed on one side.

Wherein the clutch retainer comprises a shaft hole boss protruding from both sides of a shaft hole and a pair of retainer wings protruding from the rim with an interval therebetween, and a ball is fixed concentrically with respect to the shaft hole boss, And the pair of retainer wings are formed at an angle smaller than a pair of wedge wings of the clutch wedge plate.

Wherein the brake unit includes a clutch drum having a shaft hole formed at a center thereof and at least one protruding protrusion formed on one side thereof and a circumferential groove formed concentrically with the shaft hole on one side on which the protrusion leg is not formed, A brake wedge formed with at least one protruded wedge boss and a gear having an output gear engaged with the link side sector gear, one end of the brake wedge penetrating through the brake wedge is coupled to the brake drum side, And at least one brake roller which is located on the brake wedge side and generates a braking force by a frictional force against the brake drum.

Wherein the brake wedge forms a roller locating surface for locating the brake roller on both sides of the wedge boss, the roller locating surfaces extending from the outer circumferential surface of the body of the brake wedge to a restraint section surface, And the wedge action with the brake roller is realized by reducing the interval between the brake wedges.

The brake roller comprises a pair of first and second roller shafts and an insert spring located between the first and second roller shafts and pushing the first roller shaft and the second roller shaft, respectively.

The brake roller releases the brake state by the wedge principle using the protruding leg of the clutch drum, and in the released state, the brake roller rotates the wedge boss of the brake wedge.

The brake roller compresses the insert spring located between the first and second roller shafts when the brake wedge is rotated toward the brake wedge, and the insert springs are located on both side surfaces of the wedge boss of the brake wedge that is not in contact with the first and second roller shafts Lt; / RTI >

The distance between the first and second roller housings is narrower than the width of the protruding legs of the clutch drum.

According to the present invention, since the clutch-side force transmission path for releasing the brake-side brake action is formed coaxially with the shaft center, there is an effect of simplifying the structure of the clutch- It is possible to simplify and simplify the processability, and it is possible to reduce the cost as a whole.

In addition, since the operating force of the handle lever is inputted at a position deviated from the center of the shaft, the present invention also has the effect of greatly improving the gear shaking phenomenon of the internal parts.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

1 is an exploded perspective view of a pumping ball type seat height fixing device.

A cylindrical braking drum 1 having an inner space formed by combining a rear cover 2 with a pumping ball type seat and having a high height and a mounting knob 3 fitted to the brake drum 1 and transmitting rotational force from an external handle lever , A clutch unit (A) that receives the rotational force of the handle lever through the mounting knob (3) and forms a force transmission path using a frictional force acting upon rotation as a coaxial axis with the shaft center to release the braking force, And a brake unit (B) which is rotated through the clutch unit (A) in the released state to forcibly rotate the link side sector gear to adjust the seat height.

The handle lever operation applied to the present embodiment is an UP / DOWN method and rotates counterclockwise at the time of the handle lever up (UP) and clockwise at the time of the handle lever down (DOWN).

The brake drum 1 and the rear cover 2 are provided with shaft holes 1a and 2a at the center of the shaft to position the clutch unit A and the brake unit B on the shaft center line.

Further, the brake drum 1 is formed with a guide slot 1c so as to move the mounting knob 3 within a rotation angle of the limited handle lever.

The guide slot 1c of the brake drum 1 to which the mounting knob 3 is coupled also has a shaft hole 1a opened at the center position, As shown in Fig.

As described above, the mounting knob 3 is positioned on both sides of the axis of the brake drum 1 and receives the operating force of the handle lever, so that a large swinging motion of the brake unit B side It can be improved or blocked.

Fig. 2 shows a configuration of the clutch unit A according to the present embodiment.

As shown in the figure, the clutch unit A includes a spring stopper 4 fitted into the brake drum 1 using a protruding insertion boss, a spring 5 for returning to an initial state after operation, a mounting knob And a clutch 6 that deforms the spring 5 when it is rotated through the brake unit B and outputs a rotational force transmitted in the axial direction to the brake unit B side.

The spring stopper 4 penetrates the shaft hole 1a of the brake drum 1 and the guide slot 1c by drilling the shaft hole 4a around the axis and forming the guide slot 4c on both sides of the shaft hole 4a. As shown in Fig.

The spring stopper 4 forms a pair of stop legs 4b and 4bb which are bent at 180 ° positions opposite to each other with respect to the shaft hole 4a.

The spring 5 is composed of a clutch spring 5a for generating an elastic force for initial return to the clutch side and a lever spring 5b for generating an elastic force for initial return from the handle lever side.

The clutch 6 according to the present embodiment uses a ball 9 arranged in a circular shape with respect to the shaft center, thereby forming a force transmission path using a frictional force acting on the rotation axis coaxially with the shaft center.

The clutch 6 includes a clutch wedge plate 7 in which a mounting knob 3 is fitted into a fixing hole 7c formed at both sides of a shaft hole 7a at a central position, a shaft hole 8a, A clutch retainer 8 fitted to the clutch wedge plate 7 by a boss 8aa and a ball 9 arranged in a circular shape with respect to the shaft center of the clutch retainer 8. [

The clutch wedge plate 7 further comprises a pair of wedge wings 7b and 7bb protruding at an angle of 180 ° which is a position opposite to each other at the rim of the wedge wings 7b and 7bb, 4).

The clutch retainer 8 has a pair of retainer wings 8b and 8bb protruding at an angle b smaller than 180 degrees from the rim and is formed of a ball 9 concentric with the shaft hole boss 8aa, .

Fig. 3 (A) shows an assembly diagram sequentially coupled to the clutch drum 10. Fig.

As shown in the figure, when the clutch wedge plate 7 is mounted on the clutch retainer 8 in a state where the mounting knob 3 is fixed, the clutch wedge plate 7 is supported by a ball groove 7d formed on one side, (9) and is spaced apart from the clutch retainer (8).

3 (B) shows the assembly state between the clutch wedge plate 7 and the clutch retainer 8 constituting the clutch 6 which is assembled sequentially.

The retainer wings 8b and 8bb of the clutch retainer 8 are positioned between the wedge wings 7b and 7bb of the clutch wedge plate 7 and the retainer wings 8b and 8bb of the clutch retainer 8 The wedge wings 7b and 7bb of the clutch wedge plate 7 are smaller than the diameter of the retainer wings 8b and 8bb of the clutch retainer 8, Lt; / RTI >

4 is a perspective view of the clutch wedge plate 7 assembled with each other and the spring stopper 4 and the spring 5 to the clutch retainer 8 Indicates a combined state.

As shown in the figure, the spring stopper 4 positions the clutch wedge plate 7 inward in diameter, bisects the shaft center to position the clutch spring 5a to one side of the spring stopper 4, The lever spring 5b is positioned.

The clutch spring 5a is elastically supported between the bent portion at a position where the stop legs 4b and 4bb of the spring stopper 4 are spaced apart from each other by 180 degrees and the one retainer wing 8bb of the clutch retainer 8, do.

The lever spring 5b is elastically supported via one of the stop legs 4b and 4bb of the spring stopper 4 and one of the wedge wings 7b and 7bb of the clutch wedge plate 7 .

Fig. 5 shows a locking state of the clutch 6 assembled sequentially.

As shown in the figure, the ball 9 is placed in the circumferential groove 10c concentrically folded about the shaft hole 10a on the clutch drum 10, so that the clutch retainer 8 is engaged with the clutch wedge 10a via the ball 9, Is located between the plate (7) and the clutch drum (10).

6 (A) shows a block diagram of the brake unit B side according to the present embodiment.

As shown in the figure, the brake unit B includes a clutch drum 10 having a shaft hole 10a and a protruding leg 10b protruding in one direction, and a wedge boss 11a protruding from the outer peripheral surface of the body A gear shaft 12 having a brake wedge 11 and an output gear 13 which is engaged with the brake wedge 11 and exits to a shaft hole 2a of the rear cover 2 and meshes with a link side sector gear, And a brake roller 14 positioned on the side of the brake wedge 11 and generating a brake force by a frictional force against the brake drum 1. [

A circumferential groove 10c is concentrically formed on the shaft hole 10a on one side of the clutch drum 10 on which the protruding leg 10b is not formed. 9).

The brake wedge 11 forms a spline hole 11b at the center of the shaft and the gear shaft 12 forms a spline 12c and is splined to each other. (12) may have an integral structure by forced indentation.

The brake wedge 11 forms a position groove 11c concentrically with respect to the axis center, and the position groove 11c serves as a position reference for automatic assembly.

The brake wedge 11 forms a roller locating face 11d for positioning the brake roller 14 on both sides of the wedge boss 11a and between the roller locating faces 11d, To the restraint surface 11e protruding from the restricting surface 11e.

The restraint section surface 11e restricts the brake wedge 11 with a strong braking force by reducing the distance between the brake drum 1 and the brake wedge 11 to realize the wedge action with the brake roller 14, 12 can be prevented from rotating.

6 (B) shows a gear shaft 12 which extends out of the rear cover 2. As shown in FIG. 6, the gear shaft 12 includes a coupling shaft 12a inserted into the shaft hole 1a of the brake drum 1, And an output gear 13 disposed on the link side sector gear and having an extension shaft 12b extending out of the rear cover 2 and an extension shaft 12b extending from the engagement shaft 12a, And a spline shaft 12c having a spline coupled to the spline hole 11b of the spline shaft 11.

The output gear 13 meshes with the link side sector gear to raise or lower the link side when the brake force is released, and acts to restrain the link side motion when the brake force is generated.

The brake roller 14 according to the present embodiment includes a pair of first and second roller shafts 14a and 14b and a first roller shaft 14a positioned between the first and second roller shafts 14a and 14b, And an insert spring 14c for pushing the second roller shaft 14b, respectively.

The insert spring 14c has a structure that pushes the first and second roller shafts 14a and 14b positioned on both sides of the wedge boss 11a of the brake wedge 11, .

7 shows the installation state of the brake roller 14. Fig.

The first and second roller shafts 14a and 14b which receive the force to be pushed out from the insert spring 14c when assembled to the roller position surface 11d on the side of the wedge boss 11a of the brake wedge 11, The rotation of the brake wedge 11 can be restrained by restricting the movement through the restraint section surface 11e protruding while continuing the roller position surface 11d.

The brake roller 14 has a pair of pairs of first and second roller shafts 14a and 14b and an insert spring 14c.

8 shows an assembled cross section of the pumping ball type seat height fixing device according to the present embodiment.

As shown in the figure, a pair of mounting knobs 3 are inserted into the guide slot 1c of the brake drum 1 and are positioned outside the brake drum 1, and the gear shaft 6 is engaged with the link- The output gear 13 is located outside the rear cover 2 and the clutch unit A is arranged toward the brake drum 1 and the brake unit B is arranged toward the rear cover 2 do.

When the clutch unit A is assembled, the spring stopper 4 is positioned in the inner space of the brake drum 1 with the pair of mounting knobs 3 passed through the pair of guide slots 4c, The spring 5a and the lever spring 5b are located at the outermost edges of the inner space of the brake drum 1 and the clutch retainer 8 having the clutch wedge plate 7 and the ball 9 are sequentially positioned.

The shaft holes 4a, 7a and 8a are formed in the spring stopper 4, the clutch wedge plate 7 and the clutch retainer 8 so that the gear shaft 6 ).

The clutch wedge plate 7 is coupled to a pair of mounting knobs 3 to receive the movement of the mounting knob 3 in response to an upward / downward movement of the handle lever.

The clutch retainer 8 is fixed to the clutch wedge plate 7 and the clutch drum 10 at both sides of the clutch retainer 8 by using the shaft hole boss 8aa protruded on both sides, .

When the brake unit B is assembled, the brake drum 10 is positioned at the outermost portion of the inner space of the brake drum 1, and the brake wedge 11 in which the brake roller 14 is positioned on the wedge boss 11a And is in close contact with the inner surface of the inner surface of the brake drum 1.

The clutch drum 10 is assembled by using the shaft hole boss 8aa protruding from the clutch retainer 8 and the circumferential groove 10c concentric with the shaft hole 10a is provided with the clutch retainer 8, Place the ball (9).

The position groove 11c formed concentrically with respect to the axial center of the brake wedge 11 positions the protruded portion of the clutch drum 10 due to the circumferential groove 10c, So that the wedge 11 is assembled.

The gear shaft 12 is engaged with the spline shaft 12c via a spline shaft 12c which forms a section between the coupling shaft 12a coupled to the brake drum 1 and the extension shaft 12b extending out of the rear cover 2. [ do.

Fig. 9 shows a partial operating state of the clutch unit A side when the seat height fixing device according to the present embodiment is operated by force via the handle lever.

As shown, when the handle knob 3 is moved in the guide slot 1c of the brake drum 1 by the UP or DOWN of the handle lever, the mounting knob 3 is fixed to the mounting knob 3 The clutch wedge plate 7 is also rotated together.

Up or down of the handle lever is only reverse in the rotational direction and all operations are the same, so the operation direction of the handle lever is not described in detail.

The movement of the clutch wedge plate 7 as described above causes the clutch spring 5a and the lever spring 5b provided in association with the spring stopper 4 and the clutch retainer 8 to deform, To release the brake unit (B).

The clutch spring 5a is elastically supported between a portion bent at a position where the stop legs 4b and 4bb of the spring stopper 4 are spaced apart from each other by 180 degrees and between one retainer wing 8bb of the clutch retainer 8 , And the resilient force is provided upon returning after compression deformation.

Further, the lever spring 5b is supported elastically through the spring stopper 4 and the clutch wedge plate 7, thereby providing an elastic force upon return after being compression-deformed.

The movement of the clutch retainer 8, which interlocks with the clutch wedge plate 7 as described above to form an axial force transmission path toward the brake unit B, is implemented using the ball 9. [

Fig. 5 shows a state in which the clutch 6 is not actuated. In this state, the movement of the clutch wedge plate 7 acts to move the ball 9. Fig.

Namely, the lever 9 is positioned with a strong friction force between the clutch wedge plate 7 and the clutch drum 10 in a state where the ball 9 is engaged with the clutch retainer 8, The movement of the clutch knob 3 and the spring stopper 4 toward the clutch wedge plate 7 strongly pushes the side of the ball 9 and the clutch drum 10, And is rotated in the same direction to move the brake roller 14 so that the clutch drum 10 can rotate the brake wedge 11 side.

10 shows the operating states of the clutch drum 10, the brake roller 14 and the brake wedge 11. As shown in Fig.

As shown in the figure, the protruding leg 10b moving by the rotation of the clutch drum 10 presses the second roller 14b side of the brake roller 14 located in the rotational direction side, and presses the second roller 14b 14b compressively deform the insert spring 14c fitted in the wedge boss 11a.

The second roller 14b is moved toward the roller position surface 11d from the side of the restricting section surface 11e to move the friction force between the brake drum 1 and the brake wedge 11 The state is largely weakened or released.

11, the rotation of the clutch drum 10 rotates the brake wedge 11 side in the same direction, and the rotation of the brake wedge 11 is transmitted to the gear wedge 11 fixed to the brake wedge 11, (12) in the same direction.

Since the output gear 13 fixed to the gear shaft 12 is rotated in the same direction by the rotation of the gear shaft 12 and the rotation of the output gear 13 is transmitted to the engaged sector gear, So that the height of the seat can be adjusted.

When the load applied to the handle lever is released after the seat height adjustment is completed, the elastic restoring force of the clutch spring 5a and the lever spring 5b causes the clutch unit A to return to the initial state, And is then switched back to the state.

The restoration of the initial state of the clutch unit A side is performed by rotating the clutch retainer 8 in the reverse direction at the time of operating the handle lever by the restoring force of the clutch spring 5a, The clutch wedge plate 7 is continuously operated and the clutch wedge plate 7 rotates the mounting knob 3 in the reverse direction at the time of operating the handle lever by the restoring force of the lever spring 5b, Is also switched back to the initial state.

The initial state restoration of the brake unit B side is performed by rotating the clutch drum 10 in the same direction by the action of the clutch spring 5a so that the clutch retainer 8, And at the same time, the wedge action of the brake roller 14 is realized again.

That is, when the load through the clutch drum 10 is released to the brake roller 14, the second roller 14b receiving the resilient restoring force of the compressed insert spring 14c is pressed against the roller position surface 11d of the brake wedge 11 ) To the confinement section surface 11e, and is switched to the initial state as shown in Fig.

Since the return of the brake roller 14 to its initial state implements a wedge action that is a braking force that creates a strong frictional force between the brake drum 1 and the brake wedge 11, 12 is interrupted at the brake wedge 11 restrained against the brake drum 1, so that the seat can be fixed in a state of adjusting the height.

As described above, the pumping ball type seat according to the present embodiment is heightened, and the mounting knob 3, which transmits the rotational force from the handle lever of the outside, is input at a position deviated from the center of the shaft.

Further, since the clutch 6, which receives the rotational force, forms the force transmission path using the frictional force acting on the axis coaxially with the axis, it is possible to simplify the constitution and easy machinability by reducing the related parts on the clutch side.

1 is an exploded perspective view of a pumping ball type seat height fixing apparatus according to the present invention.

Fig. 2 is an exploded perspective view of the clutch unit of Fig.

Figs. 3 (A) and 3 (B) are partial coupling diagrams of the clutch unit according to Fig. 2

Fig. 4 is a perspective view of an assembled perspective view of the clutch unit according to the present invention,

Fig. 5 is a view showing a locking state of the clutch unit according to the present invention

6 (A) and 6 (B) show the brake unit side configuration diagram of Fig. 1

Fig. 7 is an assembled cross-sectional view of the brake unit according to Fig. 6

8 is an assembled cross-sectional view of a pumping ball type seat height fixing apparatus according to the present invention

Fig. 9 is an operational state diagram of a pumping ball type seat height fixing apparatus according to the present invention

Fig. 10 is an operational sectional view of the brake unit according to the present invention

Fig. 11 is a view showing the rotation state diagram of Fig.

Description of the Related Art

1: Brake drums 1a, 2a, 4a, 7a, 8a, 10a:

1b, 2b: side flange 1c, 4c: guide slot

2: Rear cover 2c: Insertion boss

3: Mounting knob 4: Spring stopper

4b, 4bb: stop leg 5: spring

5a: clutch spring 5b: lever spring

6: Clutch

7: clutch wedge plate 7b, 7bb: wedge wing

7c: Fixing hole 7d: Ball groove

8: clutch retainer 8aa: shaft hole boss

8b, 8bb: retainer wing

9: ball 10: clutch drum

10b: protruding leg 10c: circumferential groove

11: Brake wedge 11a: Wedge boss

11b: spline hole 11c: positioning groove

11d: roller position surface 11e: confining section surface

12: gear shaft 12a: coupling shaft

12b: Extension shaft 12c: Spline

13: Output gear

14: Brake roller

14a and 14b: first and second roller shafts 14c: insert springs

Claims

A brake drum coupled to the rear cover to form an inner space;

And a brake unit for rotating the sector gear of the seat side link to adjust the seat height by releasing the wedge action on the brake drum by rotation through the clutch unit side,

The apparatus of claim 1, wherein the mounting knob is positioned on a pair of guide slots formed on both sides of the center of the brake drum.

The apparatus of claim 1, wherein the brake drum and the rear cover each have a shaft hole formed at an axial center thereof, thereby positioning the clutch unit and the brake unit on the shaft centerline.

delete

The apparatus of claim 1, wherein the spring comprises a clutch spring elastically supported between the spring stopper and the clutch retainer, and a lever spring elastically supported by the spring stopper and the clutch wedge plate.

The pumping ball type seat height fixing device according to claim 5, wherein the clutch spring and the lever spring are respectively positioned toward a region bisecting the axis center of the spring stopper.

The clutch wedge plate as set forth in claim 1, wherein the clutch wedge plate has a pair of wedge wings protruding to positions opposed to each other in a rim, a fixing hole drilled on both sides of a shaft hole at a central position to sandwich the mounting knob, Characterized by a pumping ball type seat height fixing device.

The clutch retainer according to claim 1, wherein the clutch retainer is provided with a shaft hole boss protruding from both sides of a shaft hole and a pair of retainer wings protruding at an interval from the rim, and the ball is fixed concentrically with respect to the shaft hole boss Pumping ball type seat height lock.

9. The clutch wedge as claimed in claim 8, wherein the clutch retainer has a diameter larger than the diameter of the clutch wedge plate, and a pair of retainer wings of the clutch retainer are formed at a smaller angle than a pair of wedge wings of the clutch wedge plate Ball type seat height fixing device.

The brake unit according to claim 1, wherein the brake unit comprises at least one protruding leg protruding at one side thereof with a shaft hole formed at a center thereof, and a clutch case having a circumferential groove formed concentrically with the shaft hole, And a brake wedge having at least one protruded wedge boss formed on the body rim and one of the brake wedges penetrating the brake wedge is coupled to the brake drum side and the opposite side is released to the axial hole of the rear cover, A gear shaft having an engaged output gear and at least one brake roller which is located on the brake wedge side and generates a brake force by a frictional force with respect to the brake drum.

11. The pumping ball type seat height fixing apparatus according to claim 10, wherein the brake wedge and the gear shaft are spline coupled.

The brake wedge as claimed in claim 10, wherein the brake wedge forms a roller locating surface for positioning the brake roller on both sides of the wedge boss, and the roller locating surfaces extend to a confining section surface protruding from the outer circumferential surface of the body of the brake wedge Pumping ball type seat height lock.

13. The apparatus of claim 12, wherein the confining section surface reduces a gap between the clutch drum and the brake wedge to implement a wedge action with the brake roller.

The brake roller according to claim 10, wherein the brake roller is constituted by a pair of first and second roller shafts, and an insert spring located between the first and second roller shafts and pushing the first roller shaft and the second roller shaft, respectively Pumping ball type seat height lock.

15. The pumping ball type brake according to claim 14, wherein the brake roller releases the brake state by the wedge principle using the protruding leg of the clutch drum, and the brake roller rotates the wedge boss of the brake wedge in the released state. Seat height lock.

16. The apparatus of claim 15, wherein the brake roller compresses an insert spring positioned between the first and second roller shafts during rotation of the brake wedge, wherein the insert spring urges the brake wedge Wherein the wedge boss is received in both side surface spaces of the wedge boss.

15. The apparatus of claim 14, wherein the distance between the first and second roller housings is narrower than the width of the protruding legs of the clutch drum.

15. The apparatus of claim 14, wherein the insert spring is configured to pivot the first and second roller shafts positioned on both sides of the wedge boss of the brake wedge.