Adjustable spanner

Abstract

The invention discloses an adjustable spanner, and belongs to the technical field of hardware tools. The adjustable spanner mainly comprises a spanner body, a sleeve hole and grooves distributed uniformly are formed in the spanner body, a movable fluted disc and a pawl which are matched mutually are arranged in the spanner body, an arc groove A matched with the grooves is formed in the movable fluted disc, sliding blocks are arranged in the grooves, penetrate through the arc groove A through a pin shaft and are movably connected with the movable fluted disc, and the included angle a between the tangent line of any point on the circumference of the movable fluted disc and the tangent line, passing the point, of the outer circumference of the arc groove A is 45-60 degrees; an arc groove B is concentrically formed in the movable fluted disc; the pawl is hinged to the spanner body through a pin shaft, and an elastic device is arranged between the pawl and the spanner body. The adjustable spanner is simple in structure, convenient to use, capable of tightening fasteners different in specification and size, large in locking force and not prone to slipping, protects a workpiece from injury and is mainly used for screwing a bolt or nut.

Description

technical field [0001] The invention belongs to the technical field of hardware tools, and in particular relates to an adjustable wrench. Background technique [0002] A wrench is a commonly used installation and removal tool. Hand tools for turning bolts, screws, nuts, and other open or socketed fasteners whose threads hold bolts or nuts tightly by the principle of leverage. The wrench is usually formed with an opening or a sleeve hole for clamping a bolt or a nut at one or both ends of the handle. When in use, an external force is applied to the handle along the thread rotation direction to twist the bolt or nut. At present, commonly used wrenches include open-end wrenches, ring wrenches, adjustable wrenches and universal wrenches. The open-end wrench and the ring wrench can only achieve the tightness of a single size of the fastener; the adjustable wrench is easy to slip due to the complicated process, and the application rate is low; the universal wrench damages the su...

AI Technical Summary

Problems solved by technology

The open-end wrench and ring wrench can only achieve the tightness of a single size of the fastener; the adjustable wrench is easy to slip due to the complicated process, and the application rate is low; the universal wrench damages the surface of the workpiece more seriously

[0003] Due to the various specifications and sizes of the fasteners, workers need to carry various types of wrenches. At present, there is no wrench that is suitable for various specifications or special sizes of fasteners without damaging the studs or nuts.

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