Development of Four-Bar Linkage Mechanism on Chair System for Assisting Sit-to-Stand Movement

Jeong, Hieyong; Guo, An Chi; Wang, Tianyi; Jun, Myoungiae; Ohno, Yuko

doi:10.1109/icarm.2019.8833922

Cited by 1 publication

(2 citation statements)

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“…The actuator is settled on the fixed base frame with a range of movement of 0–100 mm. α i 1 , α 1 , α 3 , and α 4 are decided as the constant by equation (2) 31 ; thus, α o 1 and α o are determined by the length of l 3 as shown in Figure 2(b). Three links of l 4 , l 5 , and l 11 were moved according to the length of actuator, and the link of l 10 ...…”

Section: Design Of Chair-typed Assistive Apparatusmentioning

confidence: 99%

“…The actuator is settled on the fixed base frame with a range of movement of 0-100 mm. a i1 , a 1 , a 3 , and a 4 are decided as the constant by equation (2) 31 ; thus, a o1 and a o are determined by the length of l 3 as shown in Figure 2 Figure 5 shows the mechanical design to connect the driving part to the two input links: (a) design to transfer driving power source to the two input links of l 10 and l 11 ; (b) design of sickle-shaped link for five-link mechanism 1. To simultaneously drive both two input links of l 10 and l 11 through the single linear actuator, it is the key-point that the mechanical connection between the mechanical part of linear actuator and two input links was designed to be fixed.…”

Section: Mechanical Designmentioning

confidence: 99%

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Operation of assistive apparatus through recognition of human behavior: Development and experimental evaluation of chair-typed assistive apparatus of nine-link mechanism with 1 degree of freedom

Jun

Jeong

Ohno

2020

Advances in Mechanical Engineering

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Because of deterioration of strength, range of joint motion, and balance ability, most care-dependent older adults require assistance to move from a seated position to a standing position. Although many sit-to-stand assisting apparatuses consisting of a seat, power transmission mechanism, and sensors have been developed, most of movements depend several actuators as the power transmission mechanism. This study aims to develop the chair-typed apparatus of nine-link mechanism with 1 degree of freedom at first, then to prove the possibility that the apparatus can be operated through the recognition of human behavior by one sensor. Here, the nine-link mechanism is divided into two mechanisms: the five link for raising the height; the four link for rotating. The mechanical part enables two input links for two mechanisms to be driven by one linear actuator simultaneously. The measurement with the infrared sensor enables the assistive apparatus to be operated automatically while patterns from measured data help the apparatus recognize what the user want to do: one is the sit-to-stand movement; the other is the stand-to-sit movement. It is discussed that the operating method through the human behavior is helpful for most older adults who are not familiar with the operation of machine.

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