Development of a Continuously Statically Balanced Tablet Computer Stand
This paper presents the design and prototype of a tablet computer stand able to be statically balanced at any operation angle. First, we introduce the mechanism design of the stand, in which the cylindrical cam, damper and spring are used. Then, we verify
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Abstract This paper presents the design and prototype of a tablet computer stand able to be statically balanced at any operation angle. First, we introduce the mechanism design of the stand, in which the cylindrical cam, damper and spring are used. Then, we verify the static balancing condition of the proposed mechanism via its force equations. Last, we built a prototype, testing that the stand can support the tablet computer in any inclined angle and can automatically return back to original place when it is not in use. Keywords Gravity compensation balancing Monitor stand
Statically balanced mechanism
Static
1 Introduction Tablet computer stand is a mechanical device for supporting tablet computers or monitors steadily staying, i.e., being statically balanced, on table at specific angles. A continuously supported tablet computer stand is a mechanism able to support the tablet computer or monitor staying at any inclined angle within the specified range of motion, that is, the stand mechanism is statically balanced. Figure 1 shows a commercially available continuously supported tablet computer stand. Two issues are generally discussed when designing continuously supported tablet computer stands, that are, the functions of static balancing and automatic return. For static balancing, there are already various designs disclosed in patent H.-K. Tsai (&) Y.-S. Chen C.-H. Kuo Department of Mechanical Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Rd, Taipei 106, Taiwan e-mail: [email protected] Y.-S. Chen e-mail: [email protected] C.-H. Kuo e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2017 X. Zhang et al. (eds.), Mechanism and Machine Science, Lecture Notes in Electrical Engineering 408, DOI 10.1007/978-981-10-2875-5_50
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Fig. 1 Continuously supported tablet computer stand [1]
documents. For example, Xue [2] raised a mechanism that a spring in the stand can expand outward to hold and bring a gear to produce a blocking force at the demanded inclined angle. Chang and Yeh [3] proposed a bi-axis mechanism with blocking cams. One of the axis can rotate up to 360° and lock at some specific angle due to its profile design. Chen [4] presented a mechanism that the friction force produced by plastic sleeve is used to make the tablet staying at any angle. For automatically returning, there are two kinds of stands for this purpose. Lin [5] used a cam mechanism to generate the returning force for the stand. Huang et al. [6] made a compression spring working with the cam for stand returning motion. On the other hand, Ahn et al. [7] designed an outer shell shape for a cam, in which the outer shell will compress the inner spring to produce demanded force for automatically returning. In summary, the above three patents all apply cams to transform a rotational motion to a translational motion for actuating a tensile or compressive spring. Then, the spring will be compressed or stretched to provide returning forc
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