CN216135486U

CN216135486U - Anti-tipping electric chair

Info

Publication number: CN216135486U
Application number: CN202121963438.1U
Authority: CN
Inventors: 徐梅钧; 刘智雄; 赵奎
Original assignee: Changzhou Jiangxinduju Intelligent Household Co ltd
Current assignee: Changzhou Jiangxinduju Intelligent Household Co ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2022-03-29
Anticipated expiration: 2031-08-20

Abstract

The utility model discloses an anti-tipping electric chair, which comprises: a backrest, a footrest, an armrest, a seat, an extension mechanism, and a drive mechanism, wherein the length of the armrest is formed of three segments, a length L substantially flush with the seat, a length L1 extending forward from a forwardmost end of the seat, and a length L2 extending rearward from a rearwardmost segment of the seat, wherein a ratio of L1 to L is at least about 0.4, and a ratio of L2 to L is at least about 0.75. In this way, the anti-tipping electric chair lengthens the length of the armrests, reduces the distance between the backrest or the footrest of the chair and the supporting points of the armrest base, and reduces the stress arm when a user applies force to the unfolded backrest or footrest, so that the obtained moment is reduced, thereby effectively preventing the electric chair from tipping forwards or backwards.

Description

Anti-tipping electric chair

Technical Field

The utility model relates to an electric chair, in particular to an electric chair for preventing overturning.

Background

At present, with the popularization of electric furniture, more and more consumers choose electric chairs or electric sofa to replace traditional sofas, and even electric chairs for children are favored by consumers, because the electric chairs or electric sofas can realize the functions of reclining back, lifting the footrest and the like, so that people can be in more comfortable postures. However, the current power-driven chair has a problem in that, in the case where the power-driven chair itself is light in weight and the user itself is heavy, the power-driven chair may tip forward or backward when the user stands on the footrest or backrest unfolded in the unfolded state of the power-driven chair, thereby possibly causing injury to the personal safety of the user.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide an anti-tipping electric chair, which lengthens the length of armrests, reduces the distance between the backrest or footrest of the chair and the supporting points of the armrest base, and reduces the stress arm when a user applies force to the unfolded backrest or footrest, so that the obtained moment is reduced, thereby effectively preventing the electric chair from tipping forwards or backwards.

In order to solve the technical problems, the utility model adopts a technical scheme that: there is provided a rollover prevention power chair comprising: a backrest, a footrest, armrests, a seat, an extension mechanism and a driving mechanism,

wherein the length of the arm rest is made up of three segments, a length L approximately flush with the seat, a length L1 extending forward from the forwardmost end of the seat and a length L2 extending rearward from the rearwardmost segment of the seat, wherein the ratio of L1 to L is at least about 0.4 and the ratio of L2 to L is at least about 0.75.

In a preferred embodiment of the utility model, the extension mechanism is connected to the backrest, the seat and the footrest.

In a preferred embodiment of the utility model, the armrests are connected to the seat.

In a preferred embodiment of the utility model, the drive mechanism is connected to the extension mechanism and the seat.

In a preferred embodiment of the utility model, the drive mechanism is a push rod motor.

The utility model has the beneficial effects that: the anti-tipping electric chair of the utility model lengthens the length of the armrest, reduces the distance between the backrest or the footrest of the chair and the supporting point of the armrest base, and reduces the stress arm when a user applies force to the unfolded backrest or footrest, so that the obtained moment is reduced, thereby effectively preventing the electric chair from tipping forwards or backwards.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a side view of a prior art powered chair in a deployed state;

FIG. 2 is a front right perspective view of the powered chair of the present invention in a sitting position;

FIG. 3 is a rear left perspective view of the powered chair of the present invention in a seated position with one armrest hidden for clarity to illustrate the connections between the components of the powered chair;

FIG. 4 is a side view of the powered chair of the present invention in a deployed state;

the parts in the drawings are numbered as follows: 100. electric chair, 110, backrest, 120, footrest, 130, armrest, 200, electric chair, 210, backrest, 220, footrest, 230, armrest, 240, seat, 241, side plate, 242, hole, 250, extension mechanism, 260, and push rod motor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, it shows a prior art electric chair 100 in an unfolded state, comprising a backrest 110, a footrest 120, and armrests 130, wherein the armrests 130 are in a trapezoidal structure, the length of the armrest base is L, the distance from the foremost end of the footrest to a pivot a is LA, the distance from the rearmost end of the backrest to a pivot B is LB, and the self weight of the electric chair is G. In the prior art, the ratio of L to LA is about 1.29 and the ratio of L to LB is about 0.85, as ergonomically designed. If a force F is applied to the footrest or backrest in the unfolded state of the power chair, a minimum force F for tilting the sofa forward or backward can be obtained according to the following equation:

FA * LA = G * L/2 （1）

FB * LB = G * L/2 （2）

where FA and FB are the forces exerted on the footrest and backrest, respectively, and LA and LB are the arms thereof, so that FA =0.65G and FB =0.43G can be obtained. Assuming that the power chair weighs about 50kg, the sofa can be tipped as long as about 32kg of people stand on the footrest or 22kg of people stand on the backrest. For children's powered chairs, which are even smaller in weight, less weight is required, so that in this case the child can easily tip the sofa over, causing injury to himself.

Referring next to fig. 2-4, embodiments of the present invention will be described.

The present invention discloses an anti-tipping electric chair 200, comprising: a backrest 210, a footrest 220, left and right armrests 230, a seat 240, an extension mechanism 250, and a pusher motor 260.

The extension mechanism 250 is fixedly coupled to the footrest plate 220, the lower surface of the seat 240, and the backrest 210 at the front, middle, and rear portions thereof, respectively. The seat 240 has a downwardly extending side plate 241 at a side thereof, and a plurality of holes 242 are provided on the side plate 241 for fixedly coupling to the armrest 230 by means of fasteners such as screws. A push rod motor 260 is coupled to the underside of the seat 240 and the rear end of the extension mechanism 250.

Unlike the prior art trapezoidal armrest structure, the length of the armrest 230 of the present invention is comprised of three segments, a center length L that is approximately flush with the seat, a length L1 extending forward from the forward-most end of the seat and a length L2 extending rearward from the rearward-most segment of the seat, wherein the ratio of L1 to L is about 0.4 and the ratio of L2 to L is about 0.75. The front and rear surfaces of the armrest 230 are downwardly curved such that the overall armrest structure is generally in the shape of a quarter of an ellipse, however, the shape of the armrest is not so limited and may be a trapezoidal structure as shown in prior art fig. 1 or other suitable structure. When the powered chair is in the unfolded state under the action of the push-rod motor, as shown in fig. 4, the minimum force F to tip the sofa can be obtained according to the following disclosure:

FA’ * (LA-L1) = G * (L/2+L1) （3）

FB’ * (LB-L2) = G * (L/2+L2) （4）

where FA 'and FB' are the forces exerted on the footrest and backrest, respectively, (LA-L1) and (LB-L2) are the arms of the forces FA 'and FB', respectively, i.e., the distances of the forces FA 'and FB' from the fulcrums A 'and B'. From the above relationship of LA, LB, L1, and L2 to L, FA '= 2.37G, FB' =2.9G can be obtained. Assuming the power chair still weighs about 50kg, it takes about 118kg of a person standing on the footrest or about 145kg of a person standing on the backrest to tip the sofa. Compared with the prior art, the utility model reduces the force arm of the force applied to the backrest or the footrest, so that the moment of the force is larger than that of the electric chair only by much larger force, thereby effectively preventing the electric chair from tipping.

The anti-tipping electric chair has the advantages that:

the length of the armrests is lengthened, the distance between the backrest or the footrest of the chair and the supporting points of the armrest base is reduced, and when a user applies force to the unfolded backrest or footrest, the stress arms are reduced, so that the obtained moment is reduced, and the electric chair is effectively prevented from tipping forwards or backwards.

It should be understood that the present invention is applied to the power chair in the present embodiment, but is not limited to the power chair, and may be applied to other chairs or sofas.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A rollover-resistant motorized chair comprising: a backrest, a footrest, armrests, a seat, an extension mechanism and a driving mechanism,

2. The rollover prevention motorized chair as recited in claim 1, wherein the extension mechanism is connected to the backrest, the seat and the footrest.

3. The tip-over prevention motorized chair of claim 1 wherein the armrests are connected to the seat.

4. The rollover prevention motorized chair as recited in claim 1, wherein the drive mechanism is coupled to the extension mechanism and the seat.

5. The tip-over resistant motorized chair of claim 1, wherein the drive mechanism is a push rod motor.