The effects of pinch width on pinch strengths of adult males using realistic pinch-handle coupling

Imrhan, Sheik N.; Rahman, Reza Abdu

doi:10.1016/0169-8141(94)00090-p

Cited by 38 publications

(19 citation statements)

References 13 publications

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“…The relative aperture of the grip may be expected to affect pinch strength (Heffernan and Freivalds, 2000;Imrhan and Rahman, 1995). In this study, in order to make the device stable and strong, the distance between the tongs was not adjustable.…”

Section: Discussionmentioning

confidence: 98%

Measuring pad–pad pinch strength in a non-human primate: Macaca fascicularis

Banks

Lavender

Buford

et al. 2007

Journal of Electromyography and Kinesiology

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Section: Discussionmentioning

confidence: 98%

Measuring pad–pad pinch strength in a non-human primate: Macaca fascicularis

Banks

Lavender

Buford

et al. 2007

Journal of Electromyography and Kinesiology

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“…The principal result of this work is that the optimal grip spans for generating maximum pinch grip force occur from 80% to 100% of a person's maximum lateral pinch grip span, as it has been defined here (70% of the distance from the interphalangeal joint of thumb to the distal interphalangeal joint There have been two other notable studies testing the effects of pinch grip span on force production. Dempsey and Ayoub (1996) found that the optimal grip span was 5 cm, whereas Imrhan and Rahman (1995) found that the optimal grip span was 1 cm. The data from the current study are more consistent with that of Dempsey and Ayoub ( Figure 5) and may be attributed to the similarities in the apparatus and testing procedures.…”

Section: Discussionmentioning

confidence: 99%

“…Lateral pinch grip force as a function of the lateral pinch grip distance for Dempsey and Ayoub (1996), Imrhan and Rahman (1995), and the current study. Note: Data for the current study are plotted relative to the average maximum lateral pinch grip span for the participant population and are placed on the same axes as data for previous studies for trend comparison purposes only; kgf = kilograms force.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Grip Span on Lateral Pinch Grip Strength

2002

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Repetitive, high-force pinch grip exertions are common in many occupational activities. The goal of the current study was to quantify the relationship between lateral pinch grip span (distance between thumb and index finger) and lateral pinch grip strength. An experiment was conducted in which 40 participants performed maximal lateral pinch grip exertions at 11 levels of grip span distances (0, 10%, ... 100% of maximum functional lateral pinch grip span distance). The results show a significant effect of lateral pinch grip span, with strength at the maximum functional lateral pinch grip span 40% higher than that found at the smallest lateral pinch grip span considered. Between these two endpoints, strength increased monotonically with increasing pinch grip span. The application of these results in pinch grip design criteria for both high-force and long-duration exertions is discussed. Potential applications of this research include the design of hand tools and controls for which significant force is applied by the user.

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“…The user will have only 60% of the pinch strength when the pinch width exceeds 110 mm (Imrhan and Rahman 1995). Therefore, when the width of the pinch is more than 110 mm for more than 1 s, a strain is identified and recorded along with the duration of the strain.…”

Section: Pinch Width Strainmentioning

confidence: 99%

Assembly planning and evaluation in an augmented reality environment

Wang

Ong

et al. 2013

International Journal of Production Research

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Assembly planning is very critical in the product design process. Previously, computer-assisted assembly planning is mostly conducted in either an automated or interactive manner. Automated approaches can only be applied to products with simple component configurations, whereas extensive user input in the tedious form of answering questions is required for interactive approaches. Both kinds of approaches do not address issues related to human factors and ergonomics, which cannot be ignored in assembly planning especially in manual assembly. Using augmented reality technologies, an intuitive and efficient approach is proposed for manual assembly planning and evaluation by combining the potential strengths of the two kinds of approach. An AR-assisted assembly planning and evaluation system has been developed to implement the proposed methodology with the use of a 3D bare-hand interaction (3DBHI) tool. After loading all the parts of an assembly into the proposed system, assembly modelling is first completed through assembly geometrical constraint recognition and assembly location refinement with the use of the proposed 3DBHI tool. By analysing the disassembly process, precedence constraints are captured and used to search for feasible assembly sequences from all possible sequences, which are generated using an existing method. Finally, practical or good sequences are selected from the feasible sequences by exploiting an assembly index based on objective evaluation. A case study is conducted to demonstrate the application of the methodology and system. IntroductionAs the competition of the manufacturing industry is increasing throughout the world, many companies tend to improve product quality, reduce product development cost and shorten time of design-to-assembly for new products. Assembly processes constitute a majority of the cost of a product (Boothroyd and Dewhurst 1989). In the assembly planning process, assembly sequences which are the backbone of assembly plans are generated and assembly operations which describe how different parts will be assembled together are formalised. Production efficiency will be improved and a large amount of cost will be reduced if a product is assembled according to a well-planned assembly sequence.Traditionally, assembly sequence planning has been conducted by either product designers or production engineers manually using either 2D drawings or physical prototypes of the product based on their intuition and experience. Nowadays, since products have become increasingly complex and the number of components has increased exponentially, manual assembly sequence planning has become impractical. In addition, physical prototyping is time-consuming and expensive for users to verify the ease of assembly. Moreover, additional cost will be incurred if there is any design change of certain components of the product. The rapid development of computer science and technology provides an alternative to solve this issue. In order to ease assembly sequence planning, research efforts have been made ...

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The effects of pinch width on pinch strengths of adult males using realistic pinch-handle coupling

Cited by 38 publications

References 13 publications

Measuring pad–pad pinch strength in a non-human primate: Macaca fascicularis

Measuring pad–pad pinch strength in a non-human primate: Macaca fascicularis

Effect of Grip Span on Lateral Pinch Grip Strength

Assembly planning and evaluation in an augmented reality environment

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