Wheel type straight line ruler

Abstract

The invention discloses a wheel-type drawing straight line ruler which belongs to the field of tools and appliances and has a simple structure and a drawing line standard. The invention is implementedin such a way that, It contains a scripting pen, ruler wheel, the left and right ends of the handle are connected with a rod, the frame bar comprises a longitudinal carriage bar groove and two connecting rod grooves, the left and right ends of the strut are respectively protruded into the frame bar groove on the left and right frame bars, two groups of parallelogram connecting rod assemblies areconnected to the frame bar through a connecting rod shaft in the middle, and at the same time, connecting rod shafts on both sides of the intermediate connecting rod shaft are arranged in the connecting rod groove through an extension part thereof; The ruler wheels are four, and each ruler wheel is connected with a pair of flat bar-shaped shaft rods including a shaft hole and a shaft slot throughan axial side thereof, and the shaft rods are connected with the connecting rod assembly through a shaft hole and a shaft slot on the shaft rods. This design is suitable for the situation where it isnecessary to draw a straight line on the wall of a cylindrical object.

Description

technical field [0001] The invention is related to tools, in particular to a wheel-type linear ruler for drawing on the walls around cylindrical objects and circular frustum (cone) objects. Background technique [0002] Paint, stickers and other surface coating and mounting operations are often required on the surrounding walls of round rod-shaped objects. Specifically, for example, round rod (column) objects that want to be placed on the side of the road (that is, the sides are straight instead of inclined) ) or truncated (cone) shaped objects (that is, the sides are sloped instead of vertical) to carry out the operation of pasting the zebra crossing to remind people to pay attention to safety. It is inconvenient and inaccurate to draw a standard vertical straight line on the surrounding walls of such objects only by using a common strip ruler. The drawn straight lines are more or less curved. For a cylindrical object, the so-called standard vertical straight line must be ...

AI Technical Summary

Problems solved by technology

[0002] Paint, stickers and other surface coating and mounting operations are often required on the surrounding walls of round rod-shaped objects. Specifically, for example, round rod (column) objects that want to be placed on the side of the road (that is, the sides are straight instead of inclined) ) or truncated (cone) shaped objects (that is, the sides are sloped instead of vertical) to carry out the operation of pasting the zebra crossing to remind people to pay attention to safety. It is inconvenient and inaccurate to draw a standard vertical straight line on the surrounding walls of such objects only by using a common strip ruler. The drawn straight lines are more or less curved. For a cylindrical object, the so-called standard vertical straight line must be parallel to the axis of the cylinder, that is, the vertical projection of this straight line must be a point; It means that the vertical projection of this straight line must be a line that coincides with the radial direction on the bottom of the frustum (cone), and the vertical projection of a line with errors must be an arc. If the drawn line is incorrect It compromises the accuracy and aesthetics of subsequent pasting operations. Therefore, a special linear ruler tool is required for the construction operation of drawing vertical straight lines on the surrounding walls of round rods.

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