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Musculoskeletal hazards and risk control
Published in Phil Hughes, Ed Ferrett, Introduction to Health and Safety in Construction, 2015
Other items of lifting tackle, usually used with cranes, include chain slings and hooks, wire and fibre rope slings, eyebolts and shackles (Figure 10.18). Special care should be taken, when slings are used, to ensure that the load is properly secured and balanced. Lifting hooks should be checked for signs of wear and any distortion of the hook. Shackles and eyebolts must be correctly tightened. Slings should always be checked for any damage before they are used and only competent people should use them. Training and instruction in the use of lifting tackle is essential and should include regular inspections of the tackle, in addition to the mandatory thorough examinations. Finally, care should be taken when these items are being stored between use.
Material Handling Systems
Published in Susmita Bandyopadhyay, Production and Operations Analysis, 2019
Crane (Figure 14.9) is another type of material handling device for carrying extremely heavy loads. Crane can pick a heavy load, carries the load horizontally, and then drops the load at a desired point. The use of crane facilitates carrying extremely heavy load without damaging the load during transportation. Labor cost is also reduced significantly as a result. The chance of facing any obstacle on the path of carriage is also nil since the load is carried in air. Various types of hooks are required to fit the load with the crane for carriage. There are various types of hooks available, such as C-hook, gripping lifters, mechanical lifter, vacuum lifter, sheet lifter, pallet lifter, lifting beams, magnet lift, and slings.
Design Criteria for Drill Rigs
Published in C.P. Chugh, Ken Steele, V.M. Sharma, Design Criteria for Drill Rigs: Equipment and Drilling Techniques, 2020
C.P. Chugh, Ken Steele, V.M. Sharma
In this case, it is 312,500 lb divided by 10, resulting in 31,250 lb. The load in the wireline, expressed in pounds of tension, is constant in the line from drum to deadline anchor. Thus the usable maximum static hook-load for Fig. 3.1 is the number of lines pulling up on the block multiplied by the single-line pull. Eight times 31,250 lb/14,200 kg equals 250,000 lb/113,500 kg hook-load capacity.
Does neuromuscular fatigue generated by trail running modify foot-ground impact and soft tissue vibrations?
Published in European Journal of Sport Science, 2023
Robin Trama, Yoann Blache, Frédérique Hintzy, Jérémy Rossi, Guillaume Y. Millet, Christophe Hautier
Plantar flexor (PF) and knee extensor (KE) maximal voluntary contractions torques (MVC) were recorded on the right leg. For both muscle groups, participants were asked to fold their arms over their chest; subjects were strongly encouraged and were provided with real-time visual feedback of the generated torque displayed on a monitor. The force signal was recorded at a sampling frequency of 2000 Hz using a PowerLab System (16/30; ADInstruments, Bella Vista, Australia) and LabChart 8 software (ADInstruments). For PF, a custom-built isometric ergometer equipped with a pedal coupled to a strain gauge was used (CS1060 300 Nm; FGP Sensors, Les Clayes-sous-Bois, France). Subjects were seated upright on the ergometer with the foot securely strapped to the pedal with a custom-made hook and loop fastener, to limit heel lift. Hip, knee, and ankle angles were set at 90°. Subjects were asked to concentrate on contracting exclusively the calf muscles. For KE, the torque was measured thanks to an isometric knee dynamometer (ARS dynamometry, SP2, Ltd., Ljubljana, Slovenia). The leg was attached to the chair by a non-compliant strap just proximal to the malleoli. Subjects were seated in an upright position with both right knee and hips at 90° of flexion with chest and hips securely strapped.
Effectiveness of dermal cleaning interventions for reducing firefighters’ exposures to PAHs and genotoxins
Published in Journal of Occupational and Environmental Hygiene, 2023
Jennifer L. A. Keir, Tracy L. Kirkham, Rocio Aranda-Rodriguez, Paul A. White, Jules M. Blais
Personal air samples of at least one participant per fire were collected using the methodology employed previously (Keir et al. 2017). Briefly, GilAir Plus pumps (Levitt Safety, Ottawa, ON) ran at 2.5 L/min with a polyurethane foam cartridge (URG, Chapel Hill, NC) and a QM-A 25-mm quartz filter (Whatman, Maidstone, UK). The sampling pump was placed in the inside pocket of the PPE coat and connected to the sample collection cartridge using polypropylene tubing along the inside of the coat. The sample collection cartridge was affixed to the back of the collar of the Bunker gear coat with a hook-and-loop fastener. Sample collection started immediately before entering the structure and continued for the full duration of the fire; collection stopped upon exit of the structure. Pumps were calibrated before sampling using a Gilian Gilibrator-2 calibrator (Levitt Safety, Ottawa, ON) for quality control. Field and travel blanks were also collected and are further described in the supplementary information.
An energy-saving anti-inclined lifting permanent magnet
Published in Australian Journal of Mechanical Engineering, 2022
Ning Ding, Chao Liu, Shanfu Cui, Jingsong Duan, Shuna Jiang
The installation relationship of each part is as follows: the internal big gear and the left ratchet are fixed with the hollow shaft through the keys and the left rotating arm fits on the hollow shaft. The external big gear and right ratchet are fixed with the shaft through the keys and the right rotating arm fits on the shaft. The internal big gear engages with internal small gear. The external big gear, the external small gear and the reversing gear engage each other. The internal small gear and the external small gear are fixed with the magnetic poles half shaft through the keys. The pawls are installed in the right and left rotating arm and matched with the left and right ratchet. The hollow shaft is mounted on the shaft. The left small chain and right small chain are respectively linked with the left rotating arm and right rotating arm. The lifting chains, the left and right small chain are linked with the lifting hook.