TWI804252B - Chair frame for wheelchair - Google Patents

Abstract

A chair frame of a wheelchair includes a base unit, a seat unit, a driving unit, and a buffer unit. The base unit includes a base frame and two pivot seats. The seating unit is pivotally connected to the base unit. The driving unit includes an operating rod arranged between the front side of the base unit and the seat unit, and the operating rod can be driven to generate a moment that drives the seat unit to pivot relative to the base unit. The buffer unit can generate a reverse torque for buffering the torque. With the arrangement of the buffer unit, the impulse force generated when the seat unit is driven to pivot can be buffered and shaking can be reduced, and the comfort of the seat can be improved, and by setting the driving unit on the front side of the base unit, the base unit can be retained Space for other components on the rear side.

Description

Chair frame for wheelchair

The invention relates to a transportation tool specially suitable for patients or disabled persons, especially a wheelchair.

A conventional chair frame of a wheelchair includes a base part, a seating part pivotally connected to the base part, and an air pressure rod. The air pressure rod is arranged between the rear side of the base part and the seat part, and can be driven to drive the seat part to pivot relative to the base part. Therefore, the user can operate the air pressure lever from the rear end of the wheelchair, and adjust the relative pivot angle between the seat part and the base part according to the requirement.

However, when the air pressure rod is used, the momentary momentum will vibrate the seating part and shake the seat frame as a whole, which will easily make the occupant feel frightened or uneasy. On the other hand, since the rear side of the base part is usually used to accommodate related accessories of the user, and the air pressure rod is arranged on the rear side of the base part, the installation space of these accessories will be compressed, hindering the accommodating The utilization of space, and is unfavorable for adjusting this air bar.

Therefore, the object of the present invention is to provide a wheelchair frame device which at least can overcome the disadvantages of the prior art.

Therefore, the chair frame of the wheelchair of the present invention includes a base unit, a seating unit, a driving unit, and a buffer unit.

The base unit includes a base frame and two pivot seats arranged on the base frame. The seating unit includes two pivotal rods respectively pivotally connected to the pivotal seats. The driving unit is arranged between the front side of the base unit and the seat unit, and includes an operating rod, which can be driven to generate a moment that drives the seat unit to pivot relative to the base unit. The buffer unit is arranged between the base unit and the seat unit, and includes at least one elastic element, and the at least one elastic element can generate a reverse moment opposite to the moment and used for buffering.

The effect of the present invention is: through the setting of the buffer unit, the impulse force generated when driving the seat unit to pivot can be buffered and the shaking can be reduced, so as to improve the comfort of riding and use; and, by setting the drive and rotation unit on the base unit On the front side, the space on the rear side of the base unit for accommodating other elements can be reserved, so as to increase the accommodating space of the chair frame of the wheelchair.

Referring to FIG. 1 and FIG. 2 , one embodiment of the chair frame of the wheelchair of the present invention includes a base unit 1 , a seat unit 2 , a driving unit 3 , and a buffer unit 4 .

The base unit 1 includes a base frame 11 and two pivot seats 12 . The underframe 11 has two front pole parts 111 extending forward and backward, two first rear bottom pole parts 112 respectively extending backward from the front pole parts 111, and two rear bottom pole parts 112 respectively extending backward from the front pole parts 111. The second rear bottom bar part 113 extends and is located on the lower side of the first rear bottom bar parts 112 . The underframe 11 also has a first cross bar portion 114 connected between the first rear bottom bar portions 112, a second cross bar portion 115 connected between the second rear bottom bar portions 113, and a The third cross bar part 116 is connected between the front bar parts 111 . A connecting portion 117 is provided between each first rear bottom rod portion 112 and the corresponding second rear bottom rod portion 113 below. The pivot seats 12 are respectively arranged on the left and right sides of the first crossbar portion 114 , and each pivot seat 12 is provided with a pivot hole penetrating left and right.

The riding unit 2 includes a seat frame set 21 , a seat back frame set 22 , and two pivot rods 23 . The seat frame set 21 has two frame bars 211 extending forward and backward, a cross bar 212 connected between the frame bars 211 , and a seat plate set 213 fixed on the upper side of the frame bars 211 . The seat back frame set 22 has a connecting portion 221 mounted on the frame rods 211 , and an extending portion 222 disposed above the connecting portion 221 . The pivot rods 23 are mounted on the insides of the frame rods 211 and respectively pivoted to the pivot holes of the pivot bases 12 .

The driving unit 3 is arranged between the front side of the base unit 1 and the seating unit 2, and includes an operating rod 31, a first engaging component 32 arranged on the crossbar 212, and a first joint assembly 32 arranged on the third crossbar. The second engaging component 33 of the portion 116. The first engaging component 32 has two first plates 321 fixed on the crossbar 212 and a first pin 322 disposed between the first plates 321 , the first pin 322 is used for the operating rod 31 The upper end of the pivot. The second connecting component 33 has two second plates 331 fixed on the third cross bar portion 116 and two second pins 332 respectively set on the second plates 331, the second pins 332 The lower end of the operating rod 31 is pivoted. The upper end and the lower end of the operating rod 31 can pivot relative to the first pin 322 and the second pins 332 respectively.

Preferably, the operating rod 31 is a pneumatic rod or a hydraulic rod, and when the operating rod 31 is driven, the first connecting component 32 can move relative to the second connecting component 33 .

The buffer unit 4 is disposed between the base unit 1 and the seating unit 2 , and includes two elastic elements 41 , and each elastic element 41 is installed between the corresponding pivot seat 12 and the corresponding pivot rod 23 .

Preferably, the installation positions of the elastic elements 41 are left-right symmetrical with respect to the center of the seating unit 2, and can more stably exert the cushioning effect for users whose body center of gravity is unbalanced, such as stroke patients and scoliosis patients .

Preferably, each elastic element 41 is a torsion spring.

In this embodiment, the number of the elastic elements 41 is two, but in other embodiments, the number of the torsion springs may also be one or more than three.

Taking the operating rod 31 as an air rod and each elastic member 41 as a torsion spring as an example for illustration, referring to Fig. 3 and Fig. 4, the operating rod 31 can be driven to make the air cylinder move up, and pass through the first joint assembly 32 pushes the cross bar 212 upwards to generate a moment that drives the seating unit 2 to pivot relative to the base unit 1 , and the user can adjust the relative pivoting angle between the seating unit 2 and the base unit 1 according to requirements. At the same time, each torsion spring disposed between the corresponding pivot seat 12 and the corresponding pivot rod 23 can generate a reverse torque acting in a direction opposite to the torque and used for buffering. Therefore, when the driving unit 3 is operated, the unstable impulse generated by it can be absorbed by the elastic elements 41 immediately, and the whole chair frame will not shake too much, allowing the user to have a more comfortable ride. Experience, for users whose body center of gravity is unbalanced, it can more effectively protect them from injury due to excessive vibration.

To sum up, the seat frame of the wheelchair of the present invention, through the setting of the buffer unit 4, can buffer the impulse generated when the driving unit 3 is operated to pivot the seat unit 2 and reduce shaking, thereby improving the comfort of riding and using. Moreover, by arranging the driving unit 3 on the front side of the base unit 1, the space at the rear side of the base unit 1 for accommodating other components can be reserved, so as to increase the accommodation space of the chair frame of the wheelchair, so it can indeed achieve purpose of the present invention.

But what is described above is only an embodiment of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

1: base unit 11: Chassis 111: front rod 112: The first rear bottom bar 113: Second rear bottom bar 114: The first crossbar 115: The second cross bar 116: The third crossbar 117: Connecting part 12: Pivot seat 2: Riding unit 21: Seat frame group 211: pole 212: cross bar 213: seat plate group 22: Chair back frame group 221: Connection Department 222: Extension 23: Pivot rod 3: Drive unit 31: Joystick 32: First articulation component 321: The first plate 322: The first pin 33:Second connecting component 331: Second plate 332: Second pin 4: buffer unit 41: elastic element

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein: Fig. 1 is the perspective view of an embodiment of the chair frame of wheelchair of the present invention; Fig. 2 is the incomplete perspective view that this embodiment does not comprise a board group; Figure 3 is a side sectional view of the embodiment; and FIG. 4 is a side sectional view of the embodiment, illustrating that a driving unit can be operated to drive a base unit to pivot.

1: base unit

11: Chassis

111: front rod

112: The first rear bottom bar

113: Second rear bottom bar

115: The second cross bar

116: The third crossbar

117: Connecting part

2: Riding unit

21: Seat frame group

211: pole

213: seat plate group

22: Chair back frame group

221: Connection Department

222: Extension

3: Drive unit

31: Joystick

33:Second connecting component

331: Second plate

332: Second pin

Claims (10)

A chair frame for a wheelchair, comprising: A base unit, including a base frame and two pivot seats arranged on the base frame; A riding unit, including two pivot rods respectively pivotally connected to the pivot seats; a driving unit, which is arranged between the front side of the base unit and the seating unit, and includes an operating rod, which can be driven to generate a moment that drives the seating unit to pivot relative to the base unit; and A buffer unit is arranged between the base unit and the seat unit, and includes at least one elastic element, and the at least one elastic element can generate a reverse moment opposite to the moment and used for buffering. The wheelchair frame according to claim 1, wherein each elastic element is a torsion spring. The chair frame of a wheelchair according to claim 1, wherein, the base frame has a first cross bar, the pivot joints are arranged on the left and right sides of the first cross bar, and the buffer unit includes two elastic Each elastic element is arranged between the corresponding pivot seat and the corresponding pivot rod. The wheelchair frame according to claim 1, wherein the operating lever is a pneumatic lever or a hydraulic lever. The wheelchair frame according to any one of claims 1 to 4, wherein the seat unit includes a seat frame group and a seat back frame group arranged on the seat frame group, the seat frame group There are two frame bars extending forward and backward, a cross bar connected between the frame bars, and the pivot rods respectively installed inside the frame bars and pivotally connected to the pivot seats. The wheelchair frame according to claim 5, wherein the seat frame set also has a seat plate set arranged on the frame bars. The wheelchair frame according to claim 6, wherein the driving unit further includes a first engaging component, the upper side of the operating rod is arranged on the cross bar through the first engaging component, and the operating rod can be driven to The seat frame set is driven to pivot with the pivot rods as fulcrums through the first connecting component. The chair frame of a wheelchair according to claim 7, wherein the bottom frame of the base unit has two front rods extending forward and backward, and two first rear bottom rods respectively extending backward from the front rods , two second rear bottom bar parts respectively extending backward from the front bar parts and located on the lower side of the first rear bottom bar parts, and the first cross bar connected between the first rear bottom bar parts part, a second cross bar part connected between the second rear bottom bar parts, and a third cross bar part connected between the front bar parts, the lower side of the operating rod passes through a second engaging assembly It is arranged on the third crossbar part. The wheelchair frame according to claim 8, wherein the first connecting component has two first plates fixed on the crossbar and a first pin disposed between the first plates, the The first pin is used for the pivoting of the upper end of the operating rod, and the second connecting component has two second plates fixed on the third cross bar and two second plates respectively arranged on the second plates. Bolt pins, the second pins are used for the pivoting of the lower end of the operating rod. The chair frame of the wheelchair according to claim 9, wherein, the bottom frame of the base unit also has two connecting parts extending up and down, and each connecting part is arranged on the corresponding first rear bottom bar part and the corresponding one Between the second rear bottom bar.

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