WO2015102460A1 - Wheelchair - Google Patents

Abstract

A wheelchair capable of going up the stairs is disclosed. The wheelchair having a seat on which a passenger sits comprises a base for supporting the seat; a pair of triangular wheels installed on both sides at the rear part of the base; a guide wheel installed at the front part of the base; a driving device for driving the triangular wheels; a power transmission shaft which is rotatably supported by the base and is driven by the driving device; and a driving gear installed at the power transmission shaft.

Description

bathchair

The present invention relates to a wheelchair, and more particularly to a wheelchair that can climb stairs.

Wheelchair users encounter various obstacles such as stairs, gravel fields, sand roads, mud roads, etc. During the operation of wheelchairs, stairs are the biggest obstacles to movement.

Being able to go up and down stairs is the same as going anywhere with a wheelchair, so the area that interests you most as a wheelchair maker is whether you can climb stairs.

As a wheelchair which can climb the stairs of the related art, it uses a transmission apparatus, the track | orbiter, etc. are used.

However, wheelchairs using electric devices have problems such as increased accessories and increased price by using motors and complex power transmission devices, and low efficiency due to increased weight of wheelchairs themselves.

Meanwhile, the wheelchair using the caterpillar consumes a lot of power not only in the climbing process for climbing the stairs but also in the driving process of moving on flat ground. In addition, there is a problem that the ride feeling is lowered due to vibration during climbing.

Patent documents; Republic of Korea Patent Publication No. 10-2011-0138430 (published Dec. 28, 2011)

Patent documents; Republic of Korea Patent Publication No. 10-2013-0086418 (published Aug. 2, 2013)

An object of the present invention is to provide a wheelchair that can move up and down stairs, in order to meet the above demands.

Another object of the present invention is to provide a wheelchair which can easily climb stairs without using a transmission device.

Still another object of the present invention is to provide a wheelchair that can easily perform flat driving and stair climbing without using a transmission device.

Another object of the present invention is to provide a wheelchair having a balancing device that can increase the ride comfort of the rider when climbing stairs.

A first embodiment of a wheelchair according to the present invention to achieve the above object

A base supporting the sheet;

A pair of triangular wheels installed at both rear sides of the base;

A guide wheel installed at the front of the base;

A driving device for driving the triangular wheel;

A power transmission shaft rotatably supported by the base and driven by the driving device; And

And a drive gear installed at the power transmission shaft.

Here, the drive device is a wheelchair, characterized in that it comprises a handle driven by the occupant, a drive plate coupled to the handle, and a ratchet gear is installed on the drive plate and coupled to the drive gear.

Characterized in that it comprises a.

Here, the triangular wheel is characterized in that the three small wheels are arranged in an equilateral triangle and each small wheel is rotated in synchronization with the drive device.

Here, the triangular wheel is

Triangular wheel frame;

A wheel axle gear disposed to form an equilateral triangle at a vertex of the triangular wheel frame;

A central shaft gear disposed at the center of an equilateral triangle formed by the wheel shaft gear;

A turning gear disposed between the wheel shaft gear and the center shaft gear; And

Preferably, the small wheel is integrally coupled to the wheel shaft gear.

Here, the triangular wheel is provided with a connection groove penetrating the center of the center shaft gear and a projection on the inner peripheral portion of the connection groove, and the insertion groove corresponding to the projection provided on the inner peripheral portion of the connection groove on the outer peripheral side of the power transmission shaft It is preferable to couple the power transmission shaft and the central shaft gear by engaging the projection and the insertion groove with each other.

In addition, the ratchet gear further comprises a direction assist rod for controlling the ratchet direction,

The turning assist rod is preferably connected to the ratchet gear through the inside of the handle.

Here, install a triangular wheel frame drive gear meshed with the drive gear,

A triangular wheel power transmission gear integrally installed with the triangular wheel frame;

A triangular wheel power transmission shaft provided at both ends with a driven gear connected to the triangular wheel power transmission gear and a drive gear meshed with the drive gear;

More,

It is preferable to control the engagement state between the triangular wheel power transmission gear and the driven gear and the drive gear and the driven gear by shifting the triangular wheel power transmission shaft.

Here, a power transmission gear is installed on the power transmission shaft,

The drive device is provided with a drive gear, it is preferable to control the driving of the small wheel constituting the triangular wheel by intermittent the engagement state of the power transmission gear and the drive gear.

Here, the central axis of the drive gear is extended to install a triangular wheel drive gear at its tip,

Install a triangular wheel power transmission gear integrally with the triangular wheel frame of the triangular wheel,

It is preferable to drive the power transmission shaft or drive the triangular wheel frame by shifting the central axis of the drive gear.

Here, the drive device is a handle operated by the occupant, a drive plate which is provided at the front end of the handle and the central axis of the drive gear is rotatably supported, a ratchet gear supported by the drive plate and meshed with the drive gear It is preferable to include.

Here, the handle is composed of a hollow pipe, it is preferable to further include an auxiliary rod inserted into the handle to adjust the ratchet direction of the ratchet gear.

Here, the wheelchair

A ratchet gear installed on the power transmission shaft; And

A motor providing a driving force to the power transmission shaft through the ratchet gear;

It is preferable to further include.

A second embodiment of a wheelchair to achieve the object of the present invention

In a wheelchair having a seat on which a passenger rides,

A base supporting the sheet;

A pair of triangular wheels installed at both rear sides of the base;

A guide wheel installed at the front of the base;

A driving device for driving the triangular wheel;

An equilibrium maintaining device for maintaining an equilibrium state of the sheet;

Here, the equilibrium maintaining device

A pair of stems rotatably supported between both front edges of the sheet and rear sides of the base;

A first secondary intermittent fixed perpendicularly to said base at a central lower portion of said sheet and having a length intermediate said length from said base to said sheet;

A third auxiliary section having a “U” shape, the leading ends of both sides of which are fixed perpendicularly to the rear edge of the sheet, the length being the middle of the length from the base to the sheet; And

It is preferable to include a second sub-interval rotatably coupled to the upper end of the first sub-interval and the lower side intermediate portion between the third sub-interval.

A third embodiment of a wheelchair to achieve the object of the present invention

In a wheelchair having a seat on which a passenger rides,

A base supporting the sheet;

A pair of triangular wheels installed at both rear sides of the base;

A guide wheel installed at the front of the base; And

And a driving device for driving the triangular wheel.

Here, the guide wheel is

A first caster and a second caster;

A biaxial wheel frame having the first caster and the second caster respectively installed at both ends thereof and having a central portion rotatably connected to the base;

A support plate that rotates according to the inclination angle of the biaxial wheel frame; And

A spring having one end fixed to the base and the other end contracted with rotation of the support plate;

Wheelchairs comprising a.

Here, the wheel size of the first caster is preferably smaller than the size of the wheel of the second caster.

Here, the base is an H-shaped frame, the guide wheel is preferably installed at each one of the front both ends of the H-shaped frame.

Here, the base is a T frame, the guide wheel is preferably installed at the front end of the T frame.

Wheelchair according to the present invention can move up and down the stairs by rotating the triangular wheel by moving the handle back and forth, it is effective to brake using the ratchet gear.

In addition, the wheelchair according to the present invention has an effect that can increase the sense of stability when the occupant climbs stairs or passes obstacles by providing a balance maintaining device.

In addition, the wheelchair according to the present invention has the effect of increasing the stability during driving and climbing by supporting the front end of the base by the front guide wheel.

1 to 2 is a perspective view showing the appearance of a wheelchair according to an embodiment of the present invention.

3 shows a basic configuration of a triangular wheel applied to a wheelchair according to the present invention.

Figure 4 is shown to explain the geometric relationship between the constituent components of the triangular wheel applied to the present invention.

FIG. 5 shows the gear structure of the triangular wheel shown in FIG.

6 shows the rotational movement of the triangular wheel.

7 shows the movement trajectory of the triangular wheel in the stairs.

8 shows a connection state of a triangular wheel frame and gears.

9 shows an appearance of a triangular wheel.

10 is a cross-sectional view showing the configuration of the triangular wheel and the parts related to the triangular wheel driving.

11 shows the structure of a drive device.

12 shows the configuration of the braking device.

13 shows the configuration of the balance keeping apparatus.

Fig. 14 shows the connection of the sheet, base and balance holder.

Figure 15 shows the direction of the forces acting on the wheelchair of the present invention and the direction of movement of each component of the balancing device.

Fig. 16 shows an example of equilibrium holding by the equilibrium holding device.

17 shows the configuration of the front guide wheel.

18 shows the operation of the front guide wheel when climbing the stairs.

Fig. 19 shows a case where the base is composed of an H-type frame.

20 shows an example in which a motor is mounted on a wheelchair according to the present invention.

1 to 2, the wheelchair 10 according to the present invention includes a seat 100, a base 200, a driving device 300, and a front guide wheel 400, in which the occupant can board. Guide wheels), the balancing device 500, triangular wheel (600).

The base 200 supports the sheet 100 and rotatably supports the front guide wheel 400 and the rear triangular wheel 600. The base 200 is basically a "T" shaped or H-shaped frame, the front guide wheel 400 is rotatably supported at the front, and the triangular wheels 600 (600a, 600b, 600b) at both sides are rotatably supported at the rear. do.

The driving device 300 (300a, 300b) generates a driving force for driving the triangular wheel 600, and includes two driving devices (300a, 300b) respectively provided for the left and right triangular wheels (600a, 600b). .

The triangular wheel 600 allows the wheelchair 10 to climb up and down the flat as well as the stairs by the driving force of the driving device 300.

Since the left and right triangular wheels 600a and 600b have the same configuration, only the configuration of the left triangular wheel will be described below for convenience of description, and the configuration of the right triangular wheel 600b will be replaced by this.

1 to 2 is a perspective view showing the appearance of a wheelchair according to an embodiment of the present invention.

1 to 2, the wheelchair 10 according to the present invention includes a seat 100, a base 200, a driving device 300, and a front guide wheel 400, in which the occupant can board. Guide wheels), the balancing device 500, triangular wheel (600).

The base 200 supports the sheet 100 and rotatably supports the front guide wheel 400 and the rear triangular wheel 600. The base 200 is basically a "T" shaped or H-shaped frame, the front guide wheel 400 is rotatably supported at the front, and the triangular wheels 600 (600a, 600b, 600b) at both sides are rotatably supported at the rear. do.

The driving device 300 (300a, 300b) generates a driving force for driving the triangular wheel 600, and includes two driving devices (300a, 300b) respectively provided for the left and right triangular wheels (600a, 600b). .

The triangular wheel 600 allows the wheelchair 10 to climb up and down the flat as well as the stairs by the driving force of the driving device 300.

Since the left and right triangular wheels 600a and 600b have the same configuration, only the configuration of the left triangular wheel will be described below for convenience of description, and the configuration of the right triangular wheel 600b will be replaced by this.

3 shows a basic configuration of a triangular wheel applied to a wheelchair according to the present invention.

Referring to FIG. 3, the triangular wheel 600 includes one central shaft gear 610, three wheel shaft gears 612; 612a through 612c, three directional shift gears 614; 614a through 614c, and three small wheels. (616; 616a-616c).

The central shaft gear 610 is rotated by the driving force generated by the driving device 300, and the wheel shaft gears 612a to 612c are integrally coupled with each of the small wheels 616a to 616c, and the central shaft gear 610 It is rotated by the generated driving force.

Figure 4 is shown to explain the geometric relationship between the constituent components of the triangular wheel applied to the present invention.

Referring to FIG. 4, the wheel shaft gears 612a to 612c are arranged in an equilateral triangle, and a central shaft gear 610 is disposed in the center of the equilateral triangle.

Small wheels 616a to 616c are located on the same plane, and their outer circumferential surfaces do not contact each other. It is preferable that the diameters of the small rings 616a to 616c become larger as long as their outer peripheral surfaces do not contact each other.

The length of one side of the equilateral triangle is determined by the height of the stairs. If the length is too small, you can't climb the stairs. Statistically, the height of the stairs is in the range of 14cm to 20cm and the width is more than 20cm. Considering these conditions, the length of one side should be less than 15cm ~ 28cm, of which 22cm is appropriate. In addition, the length of one side should be equal to or larger than the diameter of the wheel.

The central axis of the turning gear 614 is located on a straight line connecting the central axis gear 610 and the wheel shaft gear 612.

FIG. 5 shows the gear structure of the triangular wheel shown in FIG.

Referring to FIG. 5, the central shaft gears 610a to 610c are arranged in an equilateral triangle, and the central shaft of the direction change gear 614 is positioned on a straight line connecting the central shaft gear 610 and the wheel shaft gear 612. Is shown. Here, the gear ratio of the central shaft gear 610 and the wheel shaft gear 612 is preferably about 1: 3. When such a gear ratio is provided, not only the triangular wheel 600 can be easily driven by the steering wheel operation, but also the gear efficiency can be increased even when the power unit is used.

Referring to FIG. 5, a connection groove 622 is provided in the center of the central shaft gear 610 and a protrusion is formed on an inner circumferential side of the connection groove 622. The connection groove 622 is for connecting with the power transmission shaft 720. That is, the power transmission shaft 720 is coupled to the power transmission shaft 720 and the center shaft gear 610 by engaging with each other to form an insertion groove corresponding to the projection provided in the connection groove 622. However, the connection between the power transmission shaft and the central shaft gear 610 does not necessarily need to be due to the connection groove 622 of FIG. 5.

A triangular wheel frame 620 is provided such that the small wheels 616a-616c maintain an equilateral triangle arrangement. The triangular wheel frame 620 is such that the small wheels 616a to 616c are combined to form an equilateral triangle on the same plane, but it is not necessarily required to have an equilateral triangle shape in FIG. 5.

On the other hand, the side of the triangular wheel frame 620 is provided with a case connecting groove 626 for connection with the case (not shown).

6 shows the rotational movement of the triangular wheel.

Referring to FIG. 6, the driving device 300 and the central shaft gear 610 are connected to each other by the power transmission shaft 720. Wheelchair occupants can use the pushing force more effectively than the pulling force. Accordingly, when pushing the handle 310 of the drive device 300 forward, the wheelchair 10 is preferably moved in the advancing direction.

When the occupant pushes the handle 310 in the travel direction (left side in FIG. 6), the power transmission shaft 720 rotates in the travel direction. As the power transmission shaft 720 rotates in the advancing direction, the central shaft gear 610 also rotates in the advancing direction, and the turning gear 614 meshed thereto rotates in the opposite direction to the advancing direction. On the other hand, the wheel shaft gear 612 meshed with the turning gear 614 rotates in the advancing direction and the small wheel 616 rotates in the advancing direction.

7 shows the movement trajectory of the triangular wheel in the stairs.

When going down the stairs, if the first first wheel falls on the floor of the stairs, the second wheel is lowered on the floor of the second stairs by the rotation of the triangular wheel frame. By repeating this operation, the wheelchair 10 descends the stairs.

As shown in FIG. 7, since the movement line of the triangular wheel, that is, the center shaft gear 610 is close to a straight line coinciding with the inclination line of the stairs, the wheelchair occupant can stably descend the stairs. In addition, as will be described later, since the seat 100 maintains the horizontal plane by the balance maintaining apparatus 500, the wheelchair occupant can descend the stairs more stably.

Of course, the state illustrated in FIG. 7 corresponds to a state in which the height and length of the stairs and the diameters of the triangular wheel 600 are optimally combined. However, even if the height and length of the stairs are different, the wheelchair 10 according to the present invention can stably descend the stairs. This is because each of the small wheels 616 maintains free rotation while the triangular wheel frame rotates. That is, each small wheel 616 moves forward and backward on the floor of the stairs so that the wheelchair 10 can easily descend the stairs with the rotation of the triangular wheel frame.

On the other hand, since the operation of the triangular wheel when climbing the stairs is also the same will not be described separately.

Since the triangular wheel frame 620 has to rotate when moving up and down the stairs, the triangular wheel frame 620 rotates according to the rotation of the power transmission shaft 720, and this operation can be switched between the driving mode and the climbing mode. Configure.

8 shows a connection state of a triangular wheel frame and gears.

Referring to FIG. 8, the central shaft gear 610, the wheel shaft gear 612, and the turning gear 614 are supported by the triangular wheel frame 620. Specifically, the gears 610, 612, and 614 are coupled to the triangular wheel frame 620 through a ring bearing 624.

Accordingly, when the triangular wheel frame 620 is rotated, the three small wheels 616 are integrally rotated.

That is, the triangular wheel 600 has two states, in which each of the three small wheels 616 rotates and the triangular wheel frame 620 rotates.

The state in which the three small wheels 616 rotate, respectively, is used when driving on a flat surface and will be referred to as a driving mode hereinafter.

The state in which the triangular wheel frame 620 rotates is used when climbing stairs, that is, in climbing mode.

9 shows an appearance of a triangular wheel.

9, a triangular wheel frame 620 and a small wheel 616 constituting the triangular wheel 600 are illustrated.

The triangular wheel frame 620 is flat and generally constitutes an equilateral triangle, and the small wheel 616 is positioned at a vertex of the equilateral triangle. The small wheel 616 is integrally coupled with the wheel shaft gear 612 to rotate together when the wheel shaft gear 612 rotates. The central axis of the wheel shaft gear 612 is rotatably coupled to the triangular wheel frame 620 by a ring bearing 624. The wheel shaft gear 612 is driven by the central shaft gear 610 and the turning gear 616.

10 is a cross-sectional view showing the configuration of the triangular wheel and the parts related to the triangular wheel driving.

Referring to the right side of FIG. 10, the triangular wheel 600 includes a central shaft gear 610, a wheel shaft gear 612, a small wheel 616, a turning gear 614, and a triangular wheel frame 620. Able to know.

The central shaft gear 610 is coupled to the power transmission shaft 720 and rotates in synchronization with the rotation of the power transmission shaft 720.

The central shaft gear 610, the wheel shaft gear 612 and the turning gear 614 are arranged in a straight line, ie, in the same plane. The central shaft gear 610, the wheel shaft gear 612 and the diverter gear 614 have gears of the same dimensions but differ in gear ratio and diameter.

The rotational direction of the central shaft gear 610 and the wheel shaft gear 612 is the same by the action of the turning gear 614.

The central axis of the central shaft gear 610, the central axis of the wheel shaft gear 612, and the central axis of the turning gear 614 are rotatably supported by the triangular wheel frame 620.

The central axis of the wheel shaft gear 612 extends outside of the triangular wheel frame 620, and the small wheel 616 is coupled to the end thereof. The diameter of the small wheel 616 is larger than the diameter of the wheel shaft gear 612, but each small wheel 616a to 616c does not contact each other.

The power transmission shaft 720 is driven by the drive 802 and the drive power transmission gear 302. Braking is performed by the brake 900 and the brake 900 operates by flipping the handle 310 to the left and right.

The body frame 820 rotatably supports the power transmission shaft 720.

Meanwhile, referring to the left side of FIG. 10, a triangular wheel frame gear 902, a triangular wheel frame power transmission gear 904, a triangular wheel frame power drive shaft 906, and a driven gear 804 are illustrated.

The triangular wheel frame power transmission gear 904, the triangular wheel frame power drive shaft 906, and the driven gear 804 are integrally formed, thereby shifting the triangular wheel frame power drive shaft 906 from side to side to the power drive shaft 720. It is possible to control the transmission of the power of) to the triangular wheel frame 620.

The triangular wheel frame gear 902 is integrally coupled with the triangular wheel frame 620 so that the power transmission coaxial 720 is engaged with the triangular wheel frame power transmission gear 904 and the triangular wheel frame gear 902 engaged. When rotated, the triangular wheel frame 620 rotates.

The driven gear 302 is integrally coupled with the triangular wheel frame power drive shaft 906 and is shifted left and right by the operator's operation. That is, in the climbing mode, when the triangular wheel frame power drive shaft 906 is shifted from the original position to the right by the user's operation, the driving gear 302 and the driven gear 804 are engaged.

As a result, the triangular frame 620 rotates by the operation of the driving device 300.

Since the central shaft gear 610 of the tripod 600 is rotatably coupled to the power transmission shaft 720 by the ring bearing 624, the triangular wheel frame 620 rotates about the power transmission shaft 720. Possibly combined. In addition, since the rotation of the triangular wheel frame 620 is synchronized with the power transmission shaft 720, and the rotation direction of the triangular wheel frame 620 and the rotation direction of the power transmission shaft 720 coincide with each other. During rotation of 620, small wheel 616 moves in the same speed and direction. To this end, the gear ratio between the triangular wheel frame power transmission gear 904 and the triangular wheel frame gear 902 is preferably determined to correspond to the rotational ratio of the power transmission shaft 720 and the wheel shaft gear 612.

On the other hand, when the drive shaft 906 shifts to the right and returns to its original position by the occupant's operation in the driving mode, the engagement state between the drive gear 302 and the driven gear 804 is canceled, while driving the triangular wheel frame. The engagement state between the gear 904 and the triangular wheel frame power transmission gear 902 is also released.

Accordingly, the power transmission shaft 720 rotates by the operation of the drive device 800, and the small wheel 616 rotates by the action of the central shaft gear 610. At this time, the triangular wheel frame 620 does not rotate.

In FIG. 10, although the driving gear 302 and the driven gear 804 are illustrated as being directly connected to each other, a separate gear different from the driving gear 302 may be connected to the power transmission shaft 720. It may be installed and configured to connect the driven gear 804 to it.

11 shows the structure of a drive device.

Referring to FIG. 11, the driving gear 302 is combined with the driven gear 804 and forms part of the driving device 300. The driving device 300 includes a driving gear 302, a turning latch 304, a turning auxiliary bar 306, a turning key 308, and a handle 310. The drive gear 302 and the turning latch 304 constitute a so-called latched gear so that only rotation in the selected direction is possible.

Directional stops 304 (304a, 304b) is composed of two and correspond to the forward and reverse conversion, respectively.

That is, the forward switching latch 304a is used for driving forward, and when used, forward driving is possible, but reverse driving is suppressed. Reverse switching latch 304b is used for the reverse driving, using this, the reverse driving is possible, but the forward driving is suppressed.

The operation of the divert brace 304 is determined by the divert assist bars 306 (306a, 306b) and the divert key 308.

The turn assist rods 306 (306a, 306b) are arranged in an X-shape, the tilt angle of which is determined by the turn key 308. On the other hand, the end (end) of the turning auxiliary bar 306 is connected to the turning stops (304; 304a, 304b), respectively, and the turning stop bar (304) is the inclination angle of the turning auxiliary bar (306) As a result, the state of restraining or releasing the rotation of the power transmission central shaft gear 302 is maintained.

Referring to FIG. 11, when the position of the drive gear 302 is fixed, the second support point 304a-2 of the left turning latch 304a is close to the drive gear 302, and the right turning latch is The second support point 304b-2 of 304b is oppositely spaced apart. That is, it can be seen that the position of the support point is changed by the action of the turning key 308 and the turning auxiliary bar 306.

The turn brace 304 has two support points, the first support point 304-1 is fixed to the driving plate 310, and the second support points 304a-2 and 304b-2 are redirecting aid bars 306a. It is connected to the 306b, and is moved left and right according to the inclination angle of the redirection auxiliary bar (306a, 306b). The drive plate 312 is preferably installed to be relatively rotatable with respect to the drive gear 302.

In FIG. 11, when the inclination angle of the left turning auxiliary bar 306a is increased, that is, tilted downward to the right, the first supporting point 304b-1 of the right turning latch 304b is fixed to the second supporting point ( 304b-2) also moves to the lower right. Accordingly, the right turn stop 304b is separated from the drive gear 302, and as a result, the right turn stop 304b has no influence on the drive gear 302.

In this state, only the left turning latch 304a operates on the drive gear 302 to enable the drive gear 302 to rotate to the right, but not to the left.

On the contrary, in FIG. 11, when the inclination angle of the right turning auxiliary bar 306b becomes large, that is, tilted downward to the left, the first supporting point 304a-1 of the left turning latch 304a is fixed in the second state. Support point 304a-2 also moves to the lower left. Accordingly, the left turning stop 304a is separated from the drive gear 302, and as a result, the left turning stop 304a can have no influence on the drive gear 302.

In this state, only the right direction turn stop 304b operates on the drive gear 302 to allow the drive gear 302 to rotate to the left, but not to the right.

On the other hand, the left turning auxiliary bar 306a and the right turning auxiliary bar 306b are complementary to each other. That is, when one side is in an operating state, that is, a state in which the rotation direction of the drive gear 302 can be regulated / deregulated, the other side is in a released state, that is, a state in which there is no effect on the power transmission central shaft gear 302. do.

The operation state and release state of the left turning auxiliary bar 306a and the right turning auxiliary bar 306b are determined by the turning key 308.

The turning key 308 has an end bent in a "b" shape. When the head direction of the “a” shaped end is turned to the left, the left turning auxiliary bar 306a is released, and conversely to the right, the right turning auxiliary bar 306b is released.

The turning key 308 is formed integrally with the handle 310 and the head direction of the “a” shaped end of the turning key 308 is rotated by rotating the handle knob left and right.

In addition, the handle 310 is formed in a double pipe structure so that it can be extended or reduced up and down.

12 shows the configuration of the braking device.

The braking device 800 is provided to brake the driving force of the power transmission shaft 720. The braking device 800 includes a brake disc 1802, a brake lining 1804, a brake pressure arm 1806, and an auxiliary disc 1808. When the auxiliary disk 1808 moves left and right, the brake lining 1804 is brought into contact with or separated from the brake disk 1802 by the action of the X-shaped brake pressure arm 1806.

When the handle 310 is tilted to the left, the auxiliary disk 1808 moves to the left, and the brake lining 1804 contacts the brake disk 1802 by the action of the X-shaped brake pressure arm 1806 to perform braking. do.

On the contrary, when the handle 310 is returned to its original position, the auxiliary disc 1808 is returned to its original position, and the brake lining 1804 is separated from the brake disc 1802 by the action of the X-shaped brake pressure arm 1806 to release the braking state.

13 shows the configuration of the balance keeping apparatus.

The equilibrium maintaining apparatus 500 is to allow the occupant to feel a comfortable ride by keeping the angle of the seat 100 horizontal when the wheelchair 10 climbs the stairs.

Referring to FIG. 13, the equilibrium maintaining apparatus 500 includes a main balance 502, a first interpolation 504, a second interpolation 506, a third interpolation 508, and a fourth interpolation 510. ).

First, the fourth auxiliary inter-section 510 is provided at the lower front side of the sheet 100. The fourth inter-interval 510 contacts the base 200 to regulate the angle at which the sheet 100 is inclined forward. The third auxiliary interlock 508 is installed at the rear of the sheet 100. The third auxiliary section 508 has a “U” shape and the upper ends of the two sides are connected to the rear edge of the sheet 100. The first subinterval 504 is fixed perpendicular to the base 200 and its length is about half of the front leg. The second sub-interval 506 is movably connected back and forth to the upper end of the first inter-interval 504 and the bottom central portion of the third sub-interval 508.

The upper end of each of the main balance bars 502 (502a, 502b) is rotatably coupled to both front edges of the sheet 100 and the lower end is powered behind the base 200, that is, the lower part of the rear leg of the sheet 100. It is also rotatably coupled to the axis 720 portion.

In the equilibrium state, the sheet 100 also remains horizontal. Specifically, the front of the sheet 100 is supported by the main balance bar 902 while the rear of the sheet 100 is supported by the first to third subintervals 504 to 508, and the main balance bar 502. And the combinations of the first to third sub-intervals 504 to 508 form an “X” shape with each other, such that the sheet 100 maintains a horizontal state.

Fig. 14 shows the connection of the sheet, base and balance holder.

Referring to FIG. 14, it can be seen that the main balance rod 502 is fixedly connected to the front edge of the sheet 100 and the power transmission shaft 710. On the other hand, the first sub-interval 504 to the third sub-interval 508 are connected at the center and the rear of the sheet 100. The first interpolation 504 is fixed to the base 200, and the second interpolation 906 is fixedly connected to the upper end of the first interpolation 504 and the bottom central portion of the third interpolation 508. do.

Figure 15 shows the direction of the forces acting on the wheelchair of the present invention and the direction of movement of each component of the balancing device. In Fig. 15, the thick arrow shows the direction of the force acting on the sheet and the base, and the thin arrow shows the direction of movement between the sheet and the third subsidiary.

The weight of the occupant mainly acts on the wheelchair 10, and a reaction force in the traveling direction of the wheelchair 10 and an inertial force in the traveling direction of the seat 100 act.

On the other hand, the sheet 100 is in an equilibrium state by the movement direction of the main balance rod 902 and the movement of the second sub-interval 904.

Fig. 16 shows an example of equilibrium holding by the equilibrium holding device.

The upper left side of Fig. 16 shows a state of equilibrium in flat land. On a flat surface, the bent angle of the main balancer 502 and the movement of the second sub-interval 606 are balanced to maintain the sheet 100 in a horizontal state.

In the state of climbing the stairs as in the lower left side, the weight of the occupant is drawn to the rear of the sheet 100, thereby forcing the rear leg of the sheet 100 to descend, and the rear edge of the sheet 100. Rotates to the right bottom by rotating the front edge about its central axis. As a result, the second sub-interval 506 is pushed forward, but the front of the second sub-interval 506 is rotatably fixed to the tip of the first inter-interval 504 fixed to the base 200. As a result, the force for moving the second sub-interval 506 to the front pushes the main balance bar 502 forward, and thus the main balance bar 502 is inclined forward. The angle at which the main balance bar 502 is inclined forward and the force of pushing the second sub-bar 506 forward are balanced when the second sub-bar 506 is horizontal. As a result, the sheet 100 remains horizontal.

In the state of descending the stairs, such as at the upper right side and the lower right side, the weight of the occupant is pulled toward the front of the sheet 100, thereby forcing the front leg of the sheet 100 to descend downward, and the sheet 100. The rear edge of is rotated upward left by rotating the front edge about the central axis. As a result, the second sub-interval 506 is pushed to the rear, but the front side of the second sub-interval 506 is fixed to the tip of the first sub-interval 504 fixed to the base 200. The force for moving the secondary sub-intersection 506 to the rear pushes the main balance bar 502 to the rear, thereby causing the main balance bar 502 to tilt backwards. The angle at which the main balance 502 is inclined backward and the force of pushing the second sub-interval 506 to the rear are balanced when the second sub-interval 506 is horizontal. As a result, the sheet 100 remains horizontal.

Referring back to FIG. 1, in the wheelchair 10 according to the present invention, the base 200 extends toward the front of the sheet 100, and the front guide wheel 400 is rotatably supported at the front end thereof.

17 shows the configuration of the front guide wheel.

Referring to FIG. 17, the front guide wheel 400 includes two casters 404a and 404b, support plates 406, and springs 406 installed at both ends of the biaxial wheel frame 402, respectively.

The first caster 404a is main and the second caster 404b is auxiliary. The wheel size of the second caster 404b is larger than that of the first caster 404a. In addition, the tip of the second caster (404b) is located in front of the tip of the second caster (404b) in the state that the two-axis wheel frame (402) is upright.

The first and second casters 404a and 404b are rotatably supported with respect to the biaxial wheel frame 402 as being of the type attached to a conventional carrier.

In addition, a central portion of the biaxial wheel frame 402 is rotatably connected in a clockwise / counterclockwise direction with respect to the base 200.

The support plate 406 is formed integrally with the biaxial wheel frame 402 and is rotatably supported by the base 200. Accordingly, the support plate 406 rotates according to the rotation of the biaxial wheel frame 402. A spring 408 is installed next to the support plate 406. One end of the spring 408 is fixed and the other end abuts the support plate 408. Accordingly, when the support plate 408 rotates, the elastic force is changed at the upper and lower portions of the spring 406.

In an equilibrium state, that is, the biaxial wheel frame 402 is vertical, the front of the wheelchair 100 is supported by the first caster 404a.

18 shows the operation of the front guide wheel when climbing the stairs.

When the wheelchair 100 climbs the stairs, for example, when the first caster 404a is pushed backward because of the staircase, the second caster 404b is lowered because the two-axis wheel frame 402 is tilted forward. Come. As a result, the wheelchair 100 is supported by the second caster 404b, so that the wheelchair 100 is stably supported.

After climbing the stairs, the support plate 408 and the spring 406 return to the equilibrium state.

Fig. 19 shows a case where the base is composed of an H-type frame.

Referring to FIG. 19, when the base is configured as an H frame instead of a T frame, the front guide wheels 400 may be configured at both ends of the H frame.

20 shows an example in which a motor is mounted on a wheelchair according to the present invention.

As shown in FIG. 20, when the motor is mounted, driving of the power transmission shaft 720 may be easily performed. In the case of the apparatus shown in FIG. 20, since the motor 1200 is additionally mounted in addition to the configuration capable of basically driving the power transmission shaft 720 by the handle 310, the motor 1200 may have a large capacity. Will not.

Referring to FIG. 20, the rotational force of the motor 1200 is transmitted to the power drive shaft 720 through the ratchet gears 1202 and 1204.

When the number of rotations of the motor 1200 is slower than the speed of pushing the handle 310 of the driving device 300, the force pushing the handle 310 of the driving device 300 assists the insufficient force of the motor 1200. If the ratchet gears 1202. 1204 are not present, the motor 1200 must be rotated with the handle 310 when used. However, the use of ratchet gears 1202 and 1204 does not require the motor 1200 to rotate when using the handle 310.

Wheelchair according to the present invention can move up and down the stairs by rotating the triangular wheel by moving the handle back and forth, it is effective to brake using the ratchet gear.

In addition, the wheelchair according to the present invention can increase the sense of stability when the occupant climbs stairs or passes obstacles by providing a balance maintaining device.

In addition, the wheelchair according to the present invention increases the stability during driving and climbing by supporting the front end of the base by the front guide wheel.

Claims (12)

In a wheelchair having a seat on which a passenger rides, A base supporting the sheet; A pair of triangular wheels installed at both rear sides of the base; A guide wheel installed at the front of the base; A driving device for driving the triangular wheel; A power transmission shaft rotatably supported by the base and driven by the driving device; And And a drive gear installed at the power transmission shaft. Here, the drive device is a wheelchair, characterized in that it comprises a handle driven by the occupant, a drive plate coupled to the handle, and a ratchet gear is installed on the drive plate and coupled to the drive gear. The method of claim 1, The triangular wheel is wheelchair characterized in that three small wheels are arranged in an equilateral triangle and each small wheel rotates in synchronization with the driving device. The method of claim 2, wherein the triangular wheel Flat triangular wheel frames; A wheel shaft gear disposed in an equilateral triangle on the triangular wheel frame; A central shaft gear disposed at the center of an equilateral triangle formed by the wheel shaft gear; A turning gear disposed between the wheel shaft gear and the center shaft gear; And Wheel chair comprising a small wheel that is integrally coupled to the wheel shaft gear. The method of claim 3, The triangular wheel is provided with a connection groove penetrating the center of the central shaft gear and a projection is installed on the inner peripheral portion of the connection groove, and an insertion groove corresponding to the protrusion provided on the inner circumference of the connection groove is installed on the outer peripheral side of the power transmission shaft. And engaging the power transmission shaft and the central shaft gear by engaging the protrusion and the insertion groove with each other. The method of claim 1, Further comprising a turning assist rod for controlling the ratchet direction of the ratchet gear, The turning assist rod is wheelchair, characterized in that connected to the ratchet gear through the interior of the handle. The method of claim 1, Install a triangular wheel frame drive gear meshed with the drive gear, A triangular wheel power transmission gear integrally installed with the triangular wheel frame; A triangular wheel power transmission shaft provided at both ends with a driven gear connected to the triangular wheel power transmission gear and a drive gear meshed with the drive gear; More, And a driving state between the triangular wheel power transmission gear and the driven gear and the driving gear and the driven gear by shifting the triangular wheel power transmission shaft. The method of claim 1, A ratchet gear installed on the power transmission shaft; And A motor providing a driving force to the power transmission shaft through the ratchet gear; Wheelchairs comprising a further. In a wheelchair having a seat on which a passenger rides, A base supporting the sheet; A pair of triangular wheels installed at both rear sides of the base; A guide wheel installed at the front of the base; A driving device for driving the triangular wheel; An equilibrium maintaining device for maintaining an equilibrium state of the sheet; Here, the equilibrium maintaining device A pair of stems rotatably supported between both front edges of the sheet and rear sides of the base; A first secondary intermittent fixed perpendicularly to said base at a central lower portion of said sheet and having a length intermediate said length from said base to said sheet; A third auxiliary section having a “U” shape, the leading ends of both sides of which are fixed perpendicularly to the rear edge of the sheet, the length being the middle of the length from the base to the sheet; And And a second subsidiary intermittently rotatably coupled to an upper end of the first subsidiary intermittent and a lower side intermediate portion of the third subsidiary intermittent. In a wheelchair having a seat on which a passenger rides, A base supporting the sheet; A pair of triangular wheels installed at both rear sides of the base; A guide wheel installed at the front of the base; And And a driving device for driving the triangular wheel. Here, the guide wheel is A first caster and a second caster; A two-wheeled wheel frame having the first caster and the second caster respectively installed at both ends thereof, the central portion of which is rotatably connected to the tip of the base; A support plate that rotates according to the inclination angle of the biaxial wheel frame; And A spring having one end fixed to the base and the other end contracted with rotation of the support plate; Wheelchairs comprising a. The method of claim 9, Wheel size of the first caster is a wheelchair, characterized in that smaller than the size of the wheel of the second caster. The method of claim 9, The base is an H-shaped frame, The guide wheel is a wheelchair, characterized in that each one installed on each front end of the H-shaped frame. The method of claim 9, The base is a T-shaped frame, The guide wheel is a wheelchair, characterized in that installed on the front end of the T-shaped frame. .

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