scholarly journals Design and Fabrication of Wheelchair into Foldable Bed

2021 ◽  
Vol 9 (8) ◽  
pp. 1779-1786
Author(s):  
Vinay D. R
Keyword(s):  
Ultrasonic Sensor ◽  
Screw Design ◽  
Lead Screw ◽  
Obstacle Avoiding ◽  
Sliding Mechanism ◽  
Personal Use ◽  
Mobility Aid ◽  
Screw Mechanism ◽  
At Home

Abstract: In this paper lead screw mechanism is used to convert a wheelchair into bed and vice versa. When lead screw mechanism is operated, the foot rest which is downward goes till the level of seat of wheelchair and simultaneously the back support goes down to the same level making, its stretcher and vice versa, when it is converted into wheelchair from stretcher. Below the seat, a defecation system has been provided which is detachable and is operated by sliding mechanism. It is designed and fabricated in such a way that it can be used in hospitals as well as for personal use at home. Below the seat, a defecation system has been provided which is detachable and is operated by sliding mechanism. Also, obstacle avoiding sensor i.e., ultrasonic sensor is used to know if any obstacle will come in front of wheelchair, siren bell will ring. Keywords: Fabrication, Hospital, Mobility Aid, Lead Screw, Design, Wiper Motor, Wheelchair, Battery

Correlates of Use and Expected Use of Smokeless Tobacco among Kindergarten Children

1985 ◽  
Vol 56 (1) ◽  
pp. 63-66 ◽  
Author(s):  
Michael Young ◽  
Doug Williamson
Keyword(s):  
Smokeless Tobacco ◽  
Kindergarten Children ◽  
Significant Relationships ◽  
Personal Use ◽  
At Home

Kindergarten children ( n = 112) were interviewed concerning recognition, use, and expected use of smokeless tobacco. Analysis of the data indicated significant relationships between personal use of smokeless tobacco and (1) knowing someone who used smokeless tobacco, (2) sex of the student, (3) expected use, and (4) having seen the product used at home. Significant relationships also existed between expected use and knowing someone who used the product, sex of the student, and having seen the product used at home.

Design of Lead Screw Actuators for Wearable Robotic Applications

2005 ◽  
Author(s):  
Kevin W. Hollander ◽  
Thomas G. Sugar
Keyword(s):  
High Weight ◽  
Weight Ratio ◽  
Design Procedure ◽  
Mechanical Efficiency ◽  
Human Muscle ◽  
Wearable Robot ◽  
Screw Design ◽  
Lead Screw ◽  
Standard Lead ◽  
Robotic Applications

A wearable robot is a controlled and actuated device that is in direct contact with its user. As such, the implied requirements of this device are that it must be portable, lightweight and most importantly safe. To achieve these goals an actuator with a good ‘power to weight’ ratio, good mechanical efficiency, good ‘strength to weight’ ratio and that is safe is desired. The design of the standard lead screw does not normally perform well in any of these categories. The typical lead screw has low pitch angles and large radii, thereby yielding low mechanical efficiencies and high weight. However, using the design procedure outlined in this text both efficiency and weight are improved, thus yielding a lead screw system with performances that rival human muscle. The result of an example problem reveals a feasible lead screw design that has a ‘power to weight’ ratio of 277W/kg, approaching that of the DC motor driving it, at 312W/kg, as well as a mechanical efficiency of 0.74, and a maximum ‘strength to weight’ ratio of 11.3kN/kg(1154kgf/kg).

scholarly journals An Active Lead Screw Mechanism. 1st Report, Principle and Basic Characteristics.

1993 ◽  
Vol 59 (558) ◽  
pp. 392-399 ◽  
Author(s):  
Kaiji Sato ◽  
Shigehiko Imada ◽  
Yoshihisa Murayama ◽  
Akira Shimokohbe
Keyword(s):  
Lead Screw ◽  
Screw Mechanism ◽  
Basic Characteristics

scholarly journals Design of Kinetic-Energy Harvesting Floors

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5419
Author(s):  
Thitima Jintanawan ◽  
Gridsada Phanomchoeng ◽  
Surapong Suwankawin ◽  
Phatsakorn Kreepoke ◽  
Pimsalisa Chetchatree ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Alternative Energy ◽  
Dynamic Models ◽  
Average Power ◽  
Average Energy ◽  
Heel Strike ◽  
Design Parameters ◽  
Design System ◽  
Lead Screw ◽  
Screw Mechanism

Alternative energy generated from people’s footsteps in a crowded area is sufficient to power smart electronic devices with low consumption. This paper aims to present the development of an energy harvesting floor—called Genpath—using a rotational electromagnetic (EM) technique to generate electricity from human footsteps. The dynamic models of the electro-mechanical systems were developed using MATLAB®/Simulink to predict the energy performances of Genpath and help fine-tune the design parameters. The system in Genpath comprises two main parts: the EM generator and the Power Management and Storage (PMS) circuit. For the EM generator, the conversion mechanism for linear translation to rotation was designed by using the rack-pinion and lead-screw mechanism. Based on the simulation analysis, the averaged energy of the lead-screw model is greater than that of the rack-pinion model. Thus, prototype-II of Genpath with 12-V-DC generator, lead-screw mechanism was recently built. It shows better performance when compared to the previous prototype-I of Genpath with 24-V-DC-generator, rack-pinion mechanism. Both prototypes have an allowable displacement of 15 mm. The Genpath prototype-II produces an average energy of up to 702 mJ (or average power of 520 mW) per footstep. The energy provided by Genpath prototype-II is increased by approximately 184% when compared to that of the prototype-I. The efficiency of the EM-generator system is ~26% based on the 2-W power generation from the heel strike of a human’s walk in one step. Then, the PMS circuit was developed to harvest energy into the batteries and to supply the other part to specific loads. The experiment showed that the designed PMS circuit has the overall efficiency of 74.72%. The benefit of the design system is for a lot of applications, such as a wireless sensor and Internet of Thing applications.

scholarly journals Dynamic Behavior of Lead Screw Mechanism with Backlash.

1995 ◽  
Vol 61 (584) ◽  
pp. 1423-1430 ◽  
Author(s):  
Kaiji Sato ◽  
Hiroaki Fujimoto ◽  
Hideharu Osada ◽  
Akira Shimokohbe
Keyword(s):  
Dynamic Behavior ◽  
Lead Screw ◽  
Screw Mechanism

scholarly journals Characteristics of the Variable Lead Screw Mechanism with 3.DEG. Conic Frustum Meshing Elements.

1997 ◽  
Vol 40 (3) ◽  
pp. 503-511
Author(s):  
Shen-Tarng CHIOU ◽  
Fei-Ya CHEN
Keyword(s):  
Lead Screw ◽  
Screw Mechanism
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