Accessible Requires Authentication Published by De Gruyter September 19, 2018

Development of a wheeled walker braking device using the four-bar mechanism

ChangMin Choi, Se-Han Lee, DongGeon Lee, SoungKyun Hong, SeungHyeon Pyo, SuHo Park, Kyeongbong Lee and GyuChang Lee


The elderly population in many countries has been rising rapidly, and falls are a serious event many elderly people experience. Assistive equipment is actively used to reduce falls among elderly people. Popular types of assistive equipment include canes, electric wheelchairs, and wheeled walkers. Wheeled walkers support the body of elderly people, making their gait comfortable as they age or recover from injuries. Wheeled walkers may be equipped with hand brakes; however, frail older people may experience difficulty using such hand brakes, as they require force to operate. Thus, in the present study, a braking method using a wire connected to a user’s belt or clothes was designed and implemented; if the tension of the wire connecting the safety device and the user exceeds a critical value, the wheeled walker brakes, which can prevent the rapid motion of walkers. Two feasibility tests of the wheeled walker with the braking device were conducted: one with 10 healthy adults in their 20s and the other with 10 elderly people over 65 years of age; the tests measured the braking time and speed control using a speed measuring device. The results of the first and second feasibility tests demonstrated that the average braking time of participants was 50.3 ms and 50.7 ms, respectively. All participants in the feasibility tests succeeded in the speed control test. Thus, based on the results, the braking device on the wheeled walker worked properly.

Corresponding author: Prof. GyuChang Lee, Department of Physical Therapy, Kyungnam University, 7 Kyungnamdaehak-ro, Masanhappo-gu, Gyeongsangnam-do, Changwon 51767, Republic of Korea, Phone: +82-55-249-2149

  1. Author Statement

  2. Research funding: Authors state no funding involved.

  3. Conflict of interest: Authors state no conflict of interest.

  4. Informed consent: Informed consent is not applicable.

  5. Ethical approval: The conducted research is not related to either human or animals use.


[1] Martins MM, Santos CP, Frizera-Neto A, Ceres R. Assistive mobility devices focusing on smart walkers: Classification and review. Rob Auton Syst 2012;60:548–62.10.1016/j.robot.2011.11.015 Search in Google Scholar

[2] Bradley SM, Hernandez CR. Geriatric assistive devices. Am Fam Physician 2011;84:405–11.21842786 Search in Google Scholar

[3] Martins MM, Santos CP, Frizera-Neto A, Ceres R. A review of the functionalities of smart walkers. Med Eng Phys 2015;37:917–28.2630745610.1016/j.medengphy.2015.07.006 Search in Google Scholar

[4] Viegas V, Dias Pereira JM, Postolache O, Girão PS. Monitoring walker assistive devices: a novel approach based on load cells and optical distance measurements. Sensors (Basel) 2018; 18:540.10.3390/s18020540 Search in Google Scholar

[5] Tanioka T, Kai Y, Matsuda T, Inoue Y, Sugawara K, Takasaka Y, et al. Real-time measurement of frozen gait in patient with parkinsonism using a sensor-controlled walker. J Med Invest 2004;51:108–16.10.2152/jmi.51.10815000264 Search in Google Scholar

[6] Carlos V, Eliete C, Teodiano BF, Anselmo FN, Ricardo C. A new controller for a smart walker based on human-robot formation. Sensors (Basel) 2016;16:1116.10.3390/s16071116 Search in Google Scholar

[7] Hirata Y, Hara A, Kosuge K. Motion control of passive intelligent walker using servo brakes. IEEE Trans. Robot 2007;23:981–90. Search in Google Scholar

Received: 2018-03-04
Accepted: 2018-08-06
Published Online: 2018-09-19
Published in Print: 2019-08-27

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