KR101621548B1 - Dial type seat height holding device - Google Patents

Abstract

When the dial type sheet of the present invention is heightened and the dressing is rotated clockwise or counterclockwise toward the unlocking block 4 protruding out of the front housing 1 coupled with the rear cover 2, And the brake wedge 5 is driven via the gear shaft 6 at the link side in the case of releasing the external input. Is blocked by the braking force corresponding to the frictional force of the roller (10).

As a result, it has a high breaker strength and excellent price competitiveness compared to a pumping device, and has excellent operating convenience as compared with a passive type similar to the pumping device.

Further, by restricting the brake wedge 5 with the separate frictional member 20 together with the braking force through the wedge action of the brake wedge 5 and the roller 10, The back drive phenomenon can be improved even when an external force or an external shock is generated.

Dial, drum, deceleration

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 braking force by using a wedge 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, a height adjusting device for adjusting the height of the seat to adjust the height of the seat to the passenger is also provided.

For example, the pumping device is connected to the link means of the seat cushion in the seat cushion so as to be power-transmitted, and is operated by using a lever provided outside the power front seat cushion in accordance with the external operating force input.

The pumping device includes a clutch unit and a brake unit. The clutch unit serves to transmit an external input to the link means of the seat cushion. The brake unit transmits the operated link means It acts to fix.

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

In contrast to such a pumping device, the brake drum system as a dial type has only a brake unit that fixes the link means of the seat cushion, so that it is economical with a simple structure and a small manufacturing cost, and has merits suitable for application to low-cost vehicles.

Since the above-mentioned dial type is a structure that provides the brake force by using the frictional force between the brake drum and the torsion coil spring type brake spring, it is provided with a brake spring in the up / down direction, Outside is applied to 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 the frictional force between the brake spring and the drum, the strength of the brake force has a fundamental limit of weakness.

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

SUMMARY OF THE INVENTION 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 brake system capable of generating a braking force by forming a gap in a roller positioned between a wedge type counterpart coupled with a brake wedge, And it is an object of the present invention to provide a dial type seat height fixing device.

Further, the present invention further includes a friction member that generates another braking force between the spaces of the wedge-type counterpart that makes the gap between the brake drum and the roller, so that even when an external force or impact is generated from the outside, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a dial type seat height fixing device capable of improving smooth operation.

In addition, the present invention provides a braking force using a brake wedge, a roller and a wedge structure, and a braking force using a friction member separately, thereby achieving the same performance as a pumping device, And to provide a dial type seat height fixing device which can provide a high operating convenience in comparison with a passive type which is a similar type.

Further, according to the present invention, a braking force using a brake wedge, a roller, and a wedge structure as well as a braking force using a separate friction member are formed in a double manner, The present invention provides a dial type seat height fixing device capable of realizing an excellent operating force even if the ratio is small.

According to an aspect of the present invention, there is provided a dial type seat height fixing apparatus including a front housing having a shaft hole formed at a central position thereof to form a space therein, a rear cover penetrating a shaft hole at a central position thereof and coupled to the front housing, And operating means for generating a braking force for adjusting the seat height by forcibly rotating the sector gear of the seat side link with the rotational force inputted from the front housing side and switching the link to the fixed state by using the frictional force when the rotational force input is canceled .

The front housing engages with the fixing boss of the rear cover.

The operating means includes an unlocking block having a handle shaft that receives a rotational force from outside the front housing through a shaft hole pierced at the center position and a center position, and a link height adjusting mechanism for rotating the link side sector gear to raise or lower the link height And a pinion gear unit forcibly rotated through the unlocking block.

The unlocking block has at least one protruding leg in a direction opposite to the handle axis along the rim of the body having the handle axis at the center position for externally applying rotational force.

Wherein the pinion gear unit includes a brake wedge forcibly rotated by the rotational force of the unlocking block, a gear shaft having an output gear meshed with the link side sector gear outside the rear cover in a splined state at the shaft center of the brake wedge, And a plurality of rollers positioned on the brake wedge side to generate a braking force by frictional force.

Wherein the brake wedge protrudes from the outer peripheral surface of the body to form at least one wedge boss in which the roller is located, and the brake wedge is formed by projecting the rim of the outer periphery of the body, Thereby forming a frictional force preventing rotation.

The roller includes an insert spring having both side portions surrounding the width of the wedge boss, and an insert spring which is positioned on both sides of the insert spring and is pushed to the protruded body circumferential edge of the brake wedge by elastic force applied from both sides. A first roller shaft and a second roller shaft.

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

The 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 spring is disposed on both side surfaces of the wedge boss of the brake wedge that is not in contact with the first / Lt; / RTI >

The distance between the first and second roller housings is smaller than the width of the protruding leg of the unlocking block.

The brake wedge is further provided with a friction wrench for restraining the brake wedge by applying an elastic force. The friction wrench is inserted to have a frictional force with a seating groove formed on a side surface of the brake wedge while being fixed to the rear cover.

The frictional element has a contact projection protruding from the annular ring-like body surface at a predetermined interval, and a fixing pin protruding from the body surface between the contact protrusions.

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

The pinion gear having a diameter larger than that of the pinion gear and having a larger number of teeth than that of the pinion gear, the pinion gear having a larger diameter than the pinion gear and concentric with the axis of the unlocking block so as to engage with the pinion gear, As shown in Fig.

The shaft hole of the front housing through which the handle shaft passes is pierced at a position eccentric from the center position.

According to the present invention, the brake force using the brake wedge, the roller and the wedge structure as well as the braking force using the friction member are formed in a double manner, so that the braking force with high brake force strength, It is excellent in competitiveness and has an excellent operability in comparison with a passive type which is a similar method.

Further, since the present invention forms a double braking force, the back drive phenomenon can be improved even when an external force or an external shock is generated from the outside, and the operation can be smoothly implemented.

Further, since the present invention further includes a reduction gear structure at a brake release portion, an excellent operating force can be realized even if the link ratio on the link side is small.

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.

The height of the dial type seat of the present invention is increased and the seat height is changed by rotating the sector gear of the link by applying a clockwise or counterclockwise rotational force to the gear teeth. So that the seat height is adjusted by forming a strong braking force that keeps the fixed state of the link.

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

As shown in the figure, the front housing 1 has a front housing 1 which has a dial type seat and is formed at a central position by punching a shaft hole 1a and forming a space therein, a shaft hole 2a at a central position, A sector gear of a seat side link is forcibly rotated to adjust a seat height by a rotational force inputted from the front housing 1 side and a link is fixed by using a frictional force when a rotational force input is released And an operating means for generating a braking force.

The operating means has a structure that is arranged around the axis by using the shaft holes 1a and 2a respectively opened at the center positions of the front housing 1 and the rear cover 2. [

The front housing 1 and the rear cover 2 are coupled to each other via a fixing pin 2c and a side flange 1b is formed in each side of the front housing 1 And a fixing boss 2c is provided on a side flange 2b formed in the rear cover 2. [

The operating means according to the present embodiment includes an unlocking block 4 having a handle shaft 3 projecting out of the front housing 1 through a shaft hole 1a to receive a rotational force at a central position, A pinion gear unit forcibly rotated through the unlocking block 4 so as to adjust the seat height by rotating or lowering the link so as to form a frictional force against the pinion gear unit, And a frickener 20 for improving a back drive phenomenon.

The unlocking block 4 is provided with a plurality of protruding legs 4a in the direction opposite to the handle shaft 3 along the rim of the body having the handle shaft 3 at its central position, And is coupled while surrounding the gear unit portion.

The handle shaft 3 has a structure in which gears are formed in the axial direction, so that rotational force applied in a state where an external lever or rotary dial is engaged is received.

Six protruding legs 4b of the unlocking block 4 are formed at an interval of 60 degrees K. The width of the protruding legs 4b is larger than the interval between the pair of rollers 10 and chamfered the leading end thereof.

The pinion gear unit is composed of a brake wedge (5) which forms a braking force by a frictional force using a wedge structure and is forcibly rotated by the rotational force of the unlocking block (4), and a brake wedge A gear shaft 6 having an output gear 7 meshing with a link side sector gear outside the rear cover 2 in the state of the rear cover 2 and a plurality of rollers (not shown) positioned on the brake wedge 5 to generate a frictional force 10).

The wedge boss 5a projects from the outer peripheral surface of the body of the body having the spline hole 5b pierced by the shaft center position. The wedge boss 5a has a predetermined interval K and a width For example, six at intervals of 60 degrees.

The brake wedge 5 is formed with a seating groove 5c for fitting the frictional member 20 into the inner surface of the brake wedge 5 so as to be in close contact with the inner surface of the brake wedge 5. The brake wedge 5, (5c) is formed on the rear cover (2) side so as to be fitted and fixed on the rear cover (2) side.

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

A roller locating surface 5d for locating the roller 10 on the outer circumferential surface of the body of the brake wedge 5 is formed at both sides of the wedge boss 5a, So as to form a confining section surface 5e which increases the outer diameter of the body.

The restraint section surface 5e can reduce the gap between the outer circumferential surface of the body of the brake wedge 5 and the inner circumferential surface of the front housing 1 to realize the wedge action with the roller 10, .

The gear shaft 6 according to this embodiment has a spline shaft 6a having a spline formed on one side and an extension shaft 6b having an output gear 7 engaged with the link side sector gear ).

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 coupled to the shaft hole 2a of the rear cover 2 To engage the output gear 7 with the link side sector gear outside the rear cover 2 through the pipe.

The roller 10 according to the present embodiment includes a pair of first and second roller shafts 10a and 10b and a first roller shaft 10a positioned between the first and second roller shafts 10a and 10b, And an insert spring 10c for pushing the second roller shaft 10b, respectively.

The axial length A of the first and second roller shafts 10a and 10b may be longer than or equal to the width a of the brake wedge 5 and may be suitably changed as necessary.

The insert spring 10c has a structure that wraps the wedge boss 5a of the brake wedge 5 and pushes the first and second roller shafts 10a and 10b positioned on both sides of the wedge boss 5a. .

The first and second roller shafts 10a and 10b receiving the force to be pushed from the insert spring 10c are engaged with the roller position surface 3b of the wedge boss 5a of the brake wedge 5, The rotation of the brake wedge 5 can be restrained by restricting the movement through the restraint surface 5e protruding while continuing the surface 5d.

The frictional member 20 according to the present embodiment is provided with a contact protrusion 20a which is folded and protruded at a predetermined interval on an annular ring shaped body surface 20b and between the contact protrusions 20a on the body surface 20b And has a protruding fixing pin 20c.

2 shows the engaging state of the frictional member 20 in the assembled state.

As shown in the figure, the frictional member 20 is in contact with the inner surface of the seating groove 5c of the brake wedge 5 to form a frictional force. The fixing pin 20c is engaged with the rear cover 2, And is held in the fixed state.

The entire diameter of the frictional member 20 in the present embodiment is larger than the inner diameter of the seating groove 5c of the brake wedge 5 so that the diameter of the frictional member 20 during assembly is reduced, Respectively.

With this assembly method, the friction stirrer 20 can restrain the brake wedge 5 more strongly by using the elastic force, and it is possible to prevent an external force or shock generated from the outside or an abrupt release of the brake wedge 5 side While improving the back drive phenomenon at the engaged gear portion.

Thus, when the dial type seat according to the present embodiment is rotated clockwise or counterclockwise toward the unlocking block 4 protruding out of the front housing 1 coupled with the rear cover 2, The rotation of the gear shaft 6 generated with the brake wedge 5 by the rotational force through the locking block 4 acts to adjust the seat height by operating the link side sector gear.

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

The locking boss 2c of the rear cover 2 is fitted and coupled to the front housing 1 so that the handle shaft 3 of the unlocking block 4 can be inserted into the front housing 1 And the portion of the output gear 7 of the gear shaft 6 protrudes out of the rear cover 2 and is engaged with the sector gear of the link.

A brake wedge 5 in which the roller 10 is placed is coupled to the inside of the unlocking block 4 and a spline shaft 5a of the brake wedge 5 is connected to a gear shaft 5a via a spline shaft 6a. And the frictional member 20 is fitted into the fixing hole 2d of the rear cover 2 and is positioned in the seating groove 5c of the brake wedge 5. [

3 shows an assembled cross-sectional view of the roller portion of the dial type seat height fixing device according to the present embodiment.

As shown, the protruding legs 4a of the unlocking block 4 are located between the wedge bosses 5a of the brake wedge 5 and the insert spring 10c of the "M" shape is inserted into the wedge bosses 5a, The first roller shaft 10a and the second roller shaft 10b are positioned on both sides thereof.

The first roller shaft 10a and the second roller shaft 10b which are pushed by the insert spring 10c are positioned toward the restricting surface 5e after being displaced from the roller position surface 5d, A roller shaft 10a and a second roller shaft 10b form a frictional force between the brake wedge 5 and the front housing 1.

The protruding legs 4a of the unlocking block 4 are engaged with the first roller shaft 10a and the second roller shaft 10b by the wedge boss 5a in accordance with the rotational direction, And the brake wedge 5 is rotated.

The rotational force exerted on the handle shaft 3 from outside to adjust the seat height causes the unlocking block 4 to rotate Ma and the rotated unlocking block 4 presses the roller 10 with the protruding leg 4a Brake wedge 5 is rotated Mb 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 together.

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 the present embodiment.

The protruding leg 4b strongly urges the second roller shaft 10b side by the rotation Ma of the unlocking block 4 through the handle shaft 3, Is pushed while compressing the insert spring 10c.

When 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 transmitted to the brake lever 5a via the wedge boss 5a, Is switched to the rotation Mb of the wedge (5).

The rotation Mb of the brake wedge 5 is continuously transmitted to the spline-coupled gear shaft 6 to rotate together with Mc, and the rotation Mc of the gear shaft 6 is transmitted to the output gear 7 meshed with the sector gear of the link. The link side having the sector gear is raised or lowered in the rotational 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 the initial state, and the unlocking block 4 is returned to the original position to form a frictional force between the brake wedge 5 and the front housing 1 This frictional force acts as a braking force for restraining the brake wedge 5 and blocks the rotational force applied to the brake wedge 5 through the gear shaft 6 at the link side.

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

The second roller shaft 10b which receives the resilient restoring force of the inserted insert spring 10c pushes out the protruding leg 4b and the protruding leg 4b which is pushed out causes the unlocking The block 4 is rotated in the opposite direction and returned to the initial state.

When the insert spring 10c is restored to the initial state and the unlocking block 4 is returned to the initial state, the first roller shaft 10a and the second roller shaft 10b, which constitute the roller 10, And is applied to the brake wedge 5 by a strong braking force due to the wedge action between the roller 10 and the brake wedge 5 and the front housing 1 by moving to the side 5e.

The strong binding force of the brake wedge 5 acts to block the rotational force applied to the brake wedge 5 side via the gear shaft 6 at the link side so as to maintain the state of the height-adjusted seat.

On the other hand, the friction shoe 20 applied to the present embodiment is configured such that, as shown in Fig. 2, the seat 5c of the brake wedge 5 is inserted and the brake wedge 5 is restrained by a strong friction action with the inner surface thereof, (5) and the gear shaft (6).

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

At this time, the friction stirrer 20 catches the brake wedge 5 and the gear shaft 6 with frictional force, thereby reducing the back drive phenomenon on the engaged portion and smoothly implementing the operation.

Meanwhile, the present invention can variously modify the seat height fixing device, and Fig. 5 shows a modification to the rotational force input from the outside.

As shown, another embodiment of the present invention is designed to achieve the same operation even with a small external manipulating force. To this end, the handle shaft 3 and the unlocking block 4 side, to which external operating force is applied, The configuration including the brake wedge 5 engaged with the unlocking block 4 is not deformed.

That is, the steering shaft 3 and the unlocking block 4 are further provided with a reduction gear unit so that the external input is transmitted to the brake wedge 5 side.

The reduction gear unit includes a pinion gear 30 having a coaxial axis with the handle shaft 3 and a pinion gear 30 provided at an end of the pinion gear 30. The pinion gear 30 is rotatably supported on the inner side of the body rim concentrically with respect to the axial center of the unlocking block 4, And an internal gear (40) formed on the base.

The internal gear 40 may be deformed 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 teeth of the internal gear 40. The design factor is considered as the rotation angle of the internal gear 40 due to one rotation of the pinion gear 30 do.

Since the handle shaft 3 is eccentric with respect to the axial 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 engaged with the handle shaft 3 at the position eccentric to the center position.

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

As shown in the figure, the gear shaft 6 protruding toward the rear cover 2 coincides with the axial center of the rear cover 2. However, the handle shaft 3, which has protruded toward the front housing 1, And has a position eccentric to the center.

When the pinion gear 30 provided at the end of the handle shaft 3 rotated by the external rotational force is rotated Ma, the meshed internal gear 40 makes the rotation Mbb by the rotation of the pinion gear 30.

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

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 rotates the gearwheel 5 by the gear shaft 6 and the output gear 4, (7) is continuously rotated to operate the link side with the engaged sector gear to adjust the seat height.

As described above, the reduction gear unit applied to the other modified embodiment produces a power output even when a small external force is applied, so that it is possible to provide more convenient operability, and in particular, to provide operational convenience even in a structure with a small link ratio.

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

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

Fig. 3 is a cross-sectional view

4 is a rotationally sectional view of the dial type seat height fixing device according to the present invention

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

Figure 6 is an assembled cross-

    Description of the Related Art

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 face

5e:

6: Gear shaft 6a: Spline shaft

6b: Extension shaft 7: Output gear

10: Rollers

10a and 10b: first and second roller shafts 10c: insert springs

20: Frickener 20a: contact projection

20b: body surface 30: pinion gear

40: internal gear

Claims (16)

A rear cover coupled to the front housing through a shaft hole at a central position, a sector gear of the seat side link is forcibly rotated by a rotational force inputted from the front housing side, And operating means for generating a braking force for switching the link to a fixed state by using a frictional force when releasing the rotational force input; The operating means includes an unlocking block having a handle shaft that receives a rotational force from outside the front housing through a shaft hole pierced at the center position and a center position, and a link height adjusting mechanism for rotating the link side sector gear to raise or lower the link height A pinion gear unit that is forcibly rotated through the unlocking block; Wherein the pinion gear unit includes a brake wedge forcibly rotated by the rotational force of the unlocking block, a gear shaft having an output gear meshed with the link side sector gear outside the rear cover in a splined state at the shaft center of the brake wedge, And a plurality of rollers positioned on the side of the brake wedge to generate a braking force with frictional force; Wherein the brake wedge protrudes from the outer peripheral surface of the body to form at least one wedge boss in which the roller is located, and the brake wedge is formed by projecting the rim of the outer periphery of the body, So as to form a frictional force for preventing rotation of the dial type seat. The dial type seat height fixing apparatus according to claim 1, wherein the front housing is engaged with the fixing boss of the rear cover. delete 2. The dial type seat height fixing device according to claim 1, wherein the unlocking block comprises at least one protruding leg in a direction opposite to a handle axis along a rim of a body having a handle shaft at a central position, . delete delete The brake system according to claim 1, wherein the roller comprises: an insert spring having both side portions surrounding the width of the wedge boss; and an insert spring disposed on both sides of the insert spring, And a first roller shaft and a second roller shaft pushed up to a rim portion. 8. The dial type seat according to claim 7, characterized in that the roller releases the braked state by the wedge principle using the protruding leg of the unlocking block and the roller rotates the wedge boss of the brake wedge in the released state Fixing device. 9. The brake system of claim 8, wherein the roller compresses an insert spring located between the first and second roller shafts when the brake wedge is rotated, the insert spring comprising a wedge of the brake wedge Wherein the boss is received in both side surface spaces of the boss. 8. The apparatus of claim 7, wherein the distance between the first and second roller housings is narrower than the width of the protruding leg of the unlocking block. The dial type seat height fixing device according to claim 1, further comprising a friction stirrer for applying an elastic force to the brake wedge so as to restrain the brake wedge. The dial type seat height fixing device according to claim 11, wherein the frictional member is inserted to have a frictional force with a seating groove formed on a side surface of the brake wedge while being fixed to the rear cover side. [12] The dial type seat height fixing device according to claim 12, wherein the friction shiner has a contact projection protruding from the body surface of the annular ring shape at a predetermined interval, and a fixing pin protruding from the body surface between the contact protrusions. The dial type seat height adjusting device according to claim 1, further comprising a reduction gear unit between the handle shaft and the unlocking block for generating an output for rotating the unlocking block by applying a force for rotating the handle shaft, . The pinion gear according to claim 14, wherein the reduction gear unit comprises: a pinion gear having a shaft axis coaxial with the handle shaft and having a larger diameter and a larger number of teeth than the pinion gear, And an internal gear formed concentrically inside the body rim. 16. The dial type seat height fixing apparatus according to claim 15, wherein the shaft hole of the front housing through which the handle shaft extends is formed at a position eccentric from the center position.

Images