KR200350264Y1 - Wheel bracket mechanism for an electric wheelchair equipped with auxiliary wheels - Google Patents

Abstract

The present invention relates to a wheel bracket mechanism for an electric wheelchair having an auxiliary wheel, the wheel bracket mechanism comprising a frame, a pair of drive wheel brackets, four bearing assemblies, a pair of caster brackets, a pair of vibration assemblies and a Includes a pair of rollover brackets. The frame has a pair of caster brackets at the front end and a pair of anti-overturn brackets at the rear end, and the pair of drive wheel brackets are fixed to the frame having the front end and stretched forward, and the caster brackets and anti-overturning Located between the brackets, the oscillating assembly is disposed between the caster bracket and the drive wheel bracket, and the four bearing assemblies with cushioning blocks are arranged in pairs located opposite each other between both sides of the front and rear ends of the frame.

Description

WHEEL BRACKET MECHANISM FOR AN ELECTRIC WHEELCHAIR EQUIPPED WITH AUXILIARY WHEELS}

The present invention relates to a wheel bracket mechanism for an electric wheelchair, and more particularly to a wheel bracket mechanism for an electric wheelchair with an auxiliary wheel.

Electric wheelchairs have become an indispensable means of transportation to help sick elderly or disabled people with indoor and outdoor activities such as traveling, boarding airplanes, and the like.

The wheel bracket mechanism of a conventional electric wheelchair (and a vehicle, etc.) has a front wheel bracket 11 and a rear wheel bracket 12 for the rectangular frame 10 to mount the front wheel and the rear wheel at the front and rear ends, respectively. Each having a drive wheel bracket 13 (the drive wheel bracket 13 mounts the drive wheel) is generally rectangular as shown in FIG. 1 in which it is disposed between the front and rear wheel brackets 11 and 12. Is formed. Further, the front wheel bracket 11 and the drive wheel bracket 13 each have a compression spring 14, which has a front wheel bracket 11 and a drive wheel bracket 13 with respect to each other on the bumps. It is provided to stretch, increasing the cushioning effect when driving on slopes or uneven roads. Such conventional wheelchairs have the main functions of wheelchairs, but there are some disadvantages to overcome when considering stability, safety and comfort.

First, with regard to stability, the conventional rectangular frame 10 only has the advantages of longitudinal stretching and compression of the compression spring 14 to maintain stability. Even if the elastic force of the compression spring forces the front wheel bracket 11 and the drive wheel bracket 13 to retract to a predetermined position, this will also cause vertical vibration of the rectangular frame 10. Such unstable electric wheelchairs cannot provide comfortable driving to occupants, particularly elderly patients who are elderly and disabled.

Secondly, with regard to safety, the conventional rectangular frame 10 is stretched with the aid of the compression spring 14. However, stretching and compression of the front wheel bracket 11 and the drive wheel bracket 13 are performed independently and separately because there is no integrated device disposed therebetween, and the rear wheel bracket 12 is also incompressible. Thus, the conventional rectangular frame 10 will be tilted and shaken in accordance with the movement of each wheel bracket, and the center of gravity of the wheelchair is actually moved back and forth. Such wheelchairs are prone to overturning and are entirely unsuitable for the elderly and the disabled.

The present invention is devised to alleviate and / or eliminate the aforementioned disadvantages of conventional electric wheelchairs.

According to one aspect of the present invention, an auxiliary wheel includes a frame, a pair of drive wheel brackets, four bearing assemblies, a pair of caster brackets, a pair of oscillating assemblies, and a pair of anti-tipping brackets. An electric wheelchair wheel bracket mechanism is provided. The frame has a pair of caster brackets at the front end and a pair of rollover brackets at the rear end, respectively, and a pair of drive wheel brackets are secured to the frame with the front end extending forward, and the caster bracket and rollover bracket Located between and between the caster bracket and the drive wheel brackets disposed in the oscillating assembly, the four bearing assemblies with cushioning blocks are arranged such that the pairs are located opposite each other on both sides of the front and rear ends of the frame.

The main object of the present invention is to provide a wheel bracket mechanism for an electric wheelchair that provides stable support of the frame by the bearing assembly. In addition, the oscillation assembly disposed between the caster wheel bracket and the drive wheel bracket can automatically adjust the caster wheel bracket and the drive wheel bracket when the slope is raised and / or lowered by three coordinates. Thus, the electric wheelchair of the present invention can provide safe and stable riding along different slopes.

Another object of the present invention is to provide a wheel bracket mechanism for an electric wheelchair having a plurality of bearing assemblies with cushioning blocks, the stretching and compression of the bearing assembly being softer and more stable than springs and no elastic fluctuations will occur. By this arrangement, the stability of the wheelchair of the present invention is better than the conventional case.

The invention will be more clearly understood from the following description taken in connection with the accompanying drawings, which show preferred embodiments according to the invention for illustrative purposes only.

1 is a schematic plan view of a conventional wheelchair.

Figure 2 is an exploded view of the wheel bracket mechanism of the electric wheelchair according to the present invention.

Figure 3 is a side view of the wheel bracket mechanism of the electric wheelchair according to the present invention.

Figure 4 is a schematic plan view showing the wheel bracket mechanism of the electric wheelchair according to the present invention up the slope.

Figure 5 is a schematic plan view showing the wheel bracket mechanism of the electric wheelchair down the slope according to the present invention.

<Explanation of symbols for main parts of drawing>

20: frame

30: drive wheel bracket

40: bearing assembly

50: caster bracket

60: oscillating assembly

2 and 3, there is shown a wheel bracket mechanism for an electric wheelchair with an auxiliary wheel according to the present invention, which is generally a frame 20, a pair of drive wheel brackets 30, four bearing assemblies. 40, a pair of caster brackets 50, a pair of oscillation assemblies 60, and a pair of rollover brackets 70.

The rectangular shaped frame 20 has two ear members 21 symmetrically on both sides and is located between the front and rear ends. Each ear member has an opening 211 defined therein.

The drive wheel bracket 30 has a crank shape at the rear end to which the motor 31 and the drive shaft 32 are respectively fixed. The drive shaft 32 drives the drive wheel 321. The central portion of the drive wheel bracket 30 has a hole 33 corresponding to the opening 211 of the ear member 21 of the frame 20, and the hole 33 and the ear member 21 by the shaft 34. Is inserted through the opening 211. Also, the front end of the drive wheel bracket 30 is at the front part which extends forward of the frame 20 and defines the opening 35.

The bearing assembly 40 consists of a tube 41 and a plurality of cushioning blocks 42, respectively. The tube 41 is arranged so that a pair of opposed to each other on both front and rear ends of the frame 20. The cushioning block 42 defines a space 43 which is arranged inside the corresponding tube 42 and is square in cross section.

The caster bracket 50 includes a caster 511 fixed to the strut 51 at the front end and a rod 511 having a square cross section vertically disposed at the rear end. The rod 52 has a threaded hole 521 defined at one end, and corresponding space in the bearing assembly 40 (the two bearing assemblies 40 described above are located at the front end of the frame 20). It is accommodated in 43 and is screwed to the hole 521 which was threaded by the covering member 522. In addition, the opening 53 is defined in the caster bracket 50 adjacent the strut 51 corresponding to the position of the opening 35 of the drive wheel bracket 30.

The oscillation assembly 60 consists of a pair of plates 61, a rolling shaft 62 and a roller 63. The plates 61 each have a strip opening 611, each plate 61 being driven through a top and bottom opening 611 by a pair of bolts 64 and a screw nut 65, respectively, to the drive wheel brackets. It is coupled to the opening 35 of the 30 and the opening 53 of the caster bracket 50. The roller 63 is mounted to the rolling shaft 62, which is then placed by the screw nut 65 in the center of the strip opening 611 of the plate 61.

The anti-overturn bracket 70 includes an anti-overturn wheel 711 fixed to the strut 71 at the front end and a rod 72 having a square cross section vertically disposed at the rear end. The rod 72 is defined at one end and threaded received in the corresponding space 43 of the bearing assembly 40 (the two bearing assemblies 40 described above are located at the rear end of the frame 20). A hole 721 is included and screwed to the hole 721 which is threaded by the covering member 722.

Figure 4 shows a wheelchair of the present invention running on the slope. The caster 511 of the caster wheel bracket 50 is located at a relatively high level of the slope and is subjected to vertical pressure. Thus, the square rod 52 pushes most of the cushioning block 42 into the corresponding bearing assembly 40 and the cushioning block 42 deforms and begins to store energy (as shown in FIG. 4). ) Rotate caster wheel bracket 50 slightly clockwise. The drive wheel bracket 30 is not pressurized, and the plate 61 pair of oscillation assemblies 60 begins to rotate counterclockwise. On the other hand, as the plate 61 rotates together with the roller 63 and the stripe opening 611, pressure is transmitted to the front end of the drive wheel bracket 30. The rear portion of the drive wheel 321 of the drive wheel bracket 30 receives a portion of the pressure from the caster 511 by the opening 211 of the ear member 21 and the shaft 34 of the drive wheel bracket 30. . The rise of the caster bracket 511 cooperates with the drive wheel 321 of the drive wheel bracket 30 so as not to vertically tilt the front end of the frame 20 but to raise the frame 20 reliably. Thus, when driving upward on the slope, the caster wheel bracket 50 and the drive wheel bracket 30 rotate slightly clockwise, and the frame 20 rises firmly slightly without being inclined as in the conventional frame.

The pressure of the caster 511 is transmitted to the drive wheel bracket 30 more precisely until the roller 63 moves to the other side where the rise of the caster bracket 50 increases (the up slope is steep). (The caster bracket 50 and the drive wheel bracket 30 operate as a whole.) Therefore, the wheelchair of the present invention can automatically adjust itself according to different upward slopes.

5 shows that the wheelchair of the present invention travels down a slope. The caster 511 of the caster wheel bracket 50 is located at a relatively lower level on the slope. Thus, the square rod 52 pushes most of the cushioning block 42 into the corresponding bearing assembly 40 (the cushioning block 42 deforms and begins to store energy) (as shown in FIG. 5). Causes some counterclockwise rotation of caster wheel bracket 50. The drive wheel bracket 30 is not pressurized, and the plate 61 pair of oscillation assemblies 60 begins to rotate clockwise. On the other hand, by the rotation of the plate 61 made with the roller 63 and the stripe opening 611, the pressure is transmitted to the front end of the drive wheel bracket 30. The rear portion of the drive wheel 321 of the drive wheel bracket 30 is pressure (counterclockwise) from the caster 511 by the opening 211 of the ear member 21 and the shaft 34 of the drive wheel bracket 30. Part of the power). This lowering of the caster bracket 511 does not incline the front end of the frame 20 downward, but cooperates with the drive wheel 321 of the drive wheel bracket 30 so that the frame 20 can be reliably lowered. Therefore, when driving downward on the slope, the caster wheel bracket 50 and the drive wheel bracket 30 rotate slightly counterclockwise, and the frame 20 is certainly slightly lowered without being inclined as in the conventional frame. do.

Until the caster bracket 50 and the drive wheel bracket 30 move to both sides of the roller 63 indicating that the lowering of the caster bracket 50 is large (the steep downward slope), the pressure of the caster 511 is reduced by the roller ( 63) to the drive wheel bracket 30 precisely (the caster bracket 50 and the drive wheel bracket 30 operate as a whole). Therefore, the wheelchair of the present invention can automatically adjust itself along different descending slopes.

The rollover prevention bracket 70 is provided in the bearing assembly 40 so that most of the cushioning block 42 in the bearing assembly 40 assists in raising and lowering the frame 20 to provide smoothness, stability and comfortable running. It can be seen that it plays a role. In addition, the transverse stretching and compression of the bearing assembly 40 is operated by storing the force of the cushioning block 42, and the storage force of the cushioning block 42 is only for recovering the deformation, but not more. Thus, smooth widthwise stretching and compression of the bearing assembly 40 can be generated.

Those skilled in the art should appreciate that other embodiments are possible within the scope of the present invention.

The present invention can provide an electric wheelchair wheel bracket mechanism that provides stable support of the frame by the bearing assembly.

Claims (4)

Wheels for electric wheelchairs with auxiliary wheels, including a frame, a pair of drive wheel brackets, four bearing assemblies, a pair of caster brackets, a pair of oscillating assemblies, and a pair of rollover brackets Bracket mechanism, The frame is rectangular, each having openings on both sides located between the front and rear ends symmetrically with each other, The drive wheel brackets each have a drive shaft fixed to the motor and the rear end, and are fixed to the frame through an opening and a front stretch front end formed in the front end of each drive wheel bracket, The bearing assembly is disposed on both sides of the front and rear ends of the frame, Each caster bracket has a caster fixed to the strut at the front end and a rod disposed at the rear end, the rods each being received in the bearing assembly, the opening being adjacent to the strut of the caster bracket corresponding to the position of the opening of the drive wheel bracket. Formed in wealth, The oscillating assembly consists of a pair of plates, rolling shafts and rollers, each plate having a stripe opening, each plate coupled to the opening of the drive wheel bracket and the opening of the caster bracket respectively through the top and bottom of the stripe opening. Wherein the roller is mounted to the rolling shaft so that the rolling shaft is movably disposed in the middle of the sprip opening of the plate, Each of the anti-overturn brackets includes an anti-overturn wheel at the front end and a rod at the rear end, the rod being received in a corresponding bearing assembly. 2. The bearing assembly of claim 1, wherein the bearing assembly is comprised of a tube and a plurality of cushioning blocks, respectively, wherein the tubes are disposed on both sides of the front and rear ends of the pair of frames, respectively located opposite one another, the cushioning block being a corresponding tube. Disposed on the inner side of the to form a symmetrical space, and all the rods of the caster bracket and the rollover prevention bracket have threaded holes which are formed at the end and function to be received in the corresponding symmetrical space of the bearing assembly, the covering member being screwed An electric wheelchair wheel bracket mechanism having an auxiliary wheel, which is fixed to a machined hole. 3. The electric wheel with an auxiliary wheel according to claim 2, wherein the cushioning block of the bearing assembly has a symmetrical rectangular space in cross section, and all the rods of the caster bracket and the rollover prevention bracket are symmetrical in cross section. Wheelchair Wheel Mechanism. 2. The wheel bracket mechanism for electric wheelchairs as claimed in claim 1, wherein the drive wheel bracket is crank type.