Protocol hammer multi tool11/29/2023 ![]() This is particularly important where a considerable force must be applied with a sweaty hand. To ensure a good grip on a handle, sufficient friction must exist between the hand and the handle. Tools with larger or smaller spans will reduce one's maximum grip strength. Grips that are larger than 100 mm (4 in) will be difficult for some users. The recommended distance separating the handles is between 65-90 mm (2.5 to 3.5 in). Separation between handlesĬrushing, gripping or cutting tools such as pliers or tongs are equipped with two handles. Keep in mind that the use of gloves requires longer tool handles. Handles around 120 mm (5 in) are generally recommended. Tool handles should be not less than 100 mm (4 in) to reduce the negative effects of any compression exerted. It should extend across the entire breadth of the palm. LengthĪ handle that is too short can cause unnecessary compression in the middle of the palm. The larger diameter will allow for maximum torque, while the smaller diameter helps with dexterity and speed. For precision grips, a diameter of 12mm (0.45 in) is recommended, with a range of 8-16mm (0.3 to 0.6 in). In general, cylindrical handles at 40mm (1.5 in) offer a better power grip, with a range from 30-50mm (1.25 to 2 in). ![]() The crucial ergonomic principle in tool use and design - bend the tool, not the wrists - however correct and valuable does not always prevent discomfort and injuries when bent-handle tools are used indiscriminately, regardless of the layout of the work situation. In other words, select tools that allow you to keep the wrist straight or in a neutral position. Select tools that do NOT require wrist flexion, extension or deviation. Knowing the tasks and the layout of the workplace where they will be used is vital for selecting the right tools for any given job. Tools with "bent" or angled handles or tools with pistol-grips are beneficial where the force is exerted in a straight line in the same direction as the straightened forearm and wrist, especially when the force must be applied horizontally (see Figures 2, 3, 4). The belief that smaller tools should have smaller handles while larger tools have larger ones is debatable. With the exception of tools for precision work (e.g., watchmaking, microsurgery, carving), the handles and grips of hand tools should be designed for a power grip. The exception to this principle is a power hand tool, such as a grinder, that has to be heavy in order to reduce the force that the worker has to exert while using it. For example, drills that are "front-heavy" will require effort (especially in the wrist and forearm) to hold in a usable position and should be avoided. In other words, tools should feel "easy" to hold either in an upright position or in the position it will be used (i.e., pointing down). It is also important that the centre of gravity be aligned with the centre of the gripping hand. Tools above these recommendations should be supported with a counterbalance. ![]()
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