Head Angle For Cylinder Handle Tool example essay topic

Hand Tools and Devices Ergonomically oriented hand tool design: Maintain a straight wrist Maintain a straight wrist Bent Nose Pliers. Such tools permit grasping, cutting, or turning objects while the wrist remains in a relatively straight position. Hammer With Deviated Handle. The slightly bent handle maintains a straight wrist during the final impact position. Maintain a straight wrist Maintain a straight wrist Soldering Iron. The perpendicular bend of the head permits application of heat to a distal object while avoiding deviation of the wrist.

Saws, Power Wrench, Knife. A perpendicular handle (pistol grip) maintains a straight wrist during cutting, sawing, or rotary operations such as drilling or nut tightening. Maintain a straight wrist Provide an optimal grip span Cylindrical Handle. A tool for rotary action on a horizontal work piece maintain the wrist in a straight position. Excessive grip span does not allow optimal application of force and imposes undue stress upon the joints. Avoid tissue compression Protect against heat, cold, vibration extremes Excessively thin or short handles cause small surface areas which in turn cause excessive pressure on tissues, leading to loss of local circulation.

Circulation is also affected by other factors such as vibration and temperature extremes from the tool of from the immediate environment. Gloves and insulating materials are used as protective devices. Second handle Expanding spring An additional handle for powered tools, located near the front end, helps support a heavy tool, resistance to excessive torque, and safe placement of the tool on to the work piece. Expanding spring on handles opens handles without stressful operator effort.

Thumb stop Gloves A thumb stop improves stability, increases thrust force, and avoids slippage. Gloves may be unavoidably used in inclement circumstances. Compensations must be made, when gloves are used, for a diminished grip force, diminished manual dexterity, and increased bulkiness which requires large handle dimensions. General considerations Loss of grip The functional assignment of the hands. Hands, when used with a tool, may be classified into the holding hand and the assisting hand.

Dropped Tool. Power saw dropped on foot. Loss of grip Loss of grip Slipping Hazard. Hand slips on to unguarded surface. Curved Knife Guard. Loss of grip Loss of grip Knife.

Ring guard. Enclosure for one finger. Knife. Handle guard. Enclosure for all fingers.

Balanced power tool Second handle Handle located at center of gravity. A second handle near the front of a large tool allows added control. A second handle will also aid in resisting high torque forces. Crushing in between Accidental activation Handle Stops. Handle stops allowing at least 2.5 cm clearance prevent crushing fingers between handles. Trigger Guard.

A trigger guard prevents accidental activation of a power tool. Accidental activation Electric saws Guarded Foot Switch. Metal enclosure prevents inadvertent activation of the pedal switch. Exposed areas of blade covered by guard. The guard should be interlocked into the power source to prevent unauthorized removal of the guard Rounded edges Eye protection The edges of square or rectangular profiled handles should have at least a 5 mm radius to prevent excess pressure upon tissues. In chipping and striking operations, safety glasses should at least be used.

In some cases, goggles or a face shield may be even more appropriate Cutting Mushroomed chisel head Sharp cutting tools should be moved away from body parts. Striking splayed, mushroomed chisel heads produces flying chips. Total grasp Pulling wrench Chisels or points should be long enough to allow total grasp by all fingers. Foam rubber (A) may be impaled on to chisel or point to protect hand from hammer strikes. Pulling wrench towards torso avoids crushing injuries to fingers if wrench slips. Fair blow Hammer should hit object evenly and squarely to avoid chipping hazards.

Suggested dimensions and configurations Detail A 1. Handle length. 2. Handle diameter. Detail B 1. Pistol grip angle.

Detail C 1. Working head angle for cylinder handle tool. Detail D 1. Bent hammer handle angle. Detail E 1. Handle span.

2. Handle curvature. Detail F 1. Bent nose angle. Detail G 1. Trigger span.

Feature Specification Detail Handle Configuration Round or Oval AHandle Diameter for Power Grip 30-45 mm Diameter AHandle Diameter for Precision Grip 8-15 mm Diameter AHandle Length 100 mm minimum AHandle Length with Gloves 115 mm minimum Pistol Grip Handle Angle 80^0 B Cylinder Grip Handle Angle 90^0 Hammer Handle Off Set 10^0 Grip Span Pliers, Cutters 60-90 mm Grip Curvature Pliers, Cutters 12 mm Bent Nose Pliers Offset 30^0-40^0 FUn suspended Power Tool Weight 2.5 Kg -Un suspended Precision Tool Weight 2 Kg -Trigger Span (use 2 or more fingers) 90 mm maximum Handle Materials Non-conductive, non-porous, non slip, smooth, slightly compressible -Handle Fluting, Screwdriver Only if high torque needed -Secondary Handle Only if torque resistance needed or excessively heavy tool -.