Line drawing tool

Abstract

The utility model discloses a line drawing tool which comprises a hinge parallelogram frame, a pair of side frames of the hinge parallelogram frame are selected as sliding side frames, and the other pair of side frames of the hinge parallelogram frame are selected as connecting side frames. Providing a support plate, wherein the support plate is parallel to the sliding frame or the connecting frame; if the support plate is parallel to the sliding frame, the two ends of the support plate are hinged to the middle of the connecting frame, and at the moment, a pen holder is arranged on the support plate; if the support plate is parallel to the connecting frame, two ends of the support plate are hinged to the sliding frame, and a pen holder is arranged in the middle of the support plate. The line drawing tool is simple in structure and convenient to use.

Description

Technical Field

[0001] The utility model relates to a line drawing tool. Background Art

[0002] Markers are widely used in the mechanical field. As special tools, markers generally have specific applications, such as center line markers. The marker involved in the utility model is a marker specifically used for drawing center lines.

[0003] For example, Chinese patent document CN207888624U discloses a center line marking device for the side panel of a guitar barrel. The center line marking device is a typical center line marking device of this type, which has a clamping mechanism and a marking mechanism, as well as a frame to which these two mechanisms are attached, wherein the clamping mechanism includes a clamping table, a clamping bracket and a clamping cylinder, wherein the clamping bracket is roughly in an inverted L shape and has a horizontal rod and a vertical rod, so that the clamping cylinder can be installed on the horizontal rod, and the push rod of the clamping cylinder can press down the guitar barrel placed on the clamping table. The marking mechanism includes a marking bracket, a marking cylinder and a marking assembly, wherein the marking cylinder is fixedly mounted on the marking bracket, and the push rod of the marking cylinder is connected to the marking assembly. Furthermore, the marking assembly includes a servo motor, a moving tool holder and a marking tool, and the moving tool holder is slidably connected to the marking bracket, and the marking is achieved by driving the marking bracket by the servo motor. A positioning device is also required to assist in marking. The center line marker has multiple mechanisms, is complex as a whole, and requires electrical equipment assistance, which makes the operation complicated and is bound to affect the overall efficiency.

[0004] The inventor believes that line drawing is a common operation in the mechanical field, and the corresponding line drawing device should not be too complicated, and the operation is even more so. If multiple steps need to be executed in order to draw a line, it is not only inefficient but also prone to errors.

[0005] In view of this, for example, Chinese patent document CN218747696U discloses a relatively simple line drawing tool, and its application scenario is the outlet pipe bend for a pump. The line drawing tool includes a line drawing frame, a positioning plate, a transverse slat, a longitudinal slat and a straight ruler, wherein the transverse slat and the longitudinal slat intersect vertically and are both connected to the line drawing frame, and the positioning plate is connected below the intersection of the transverse slat and the longitudinal slat. A pair of side frames of the line drawing frame are correspondingly provided with a plurality of pairs of placement grooves, and the straight ruler can be placed in any pair of placement grooves and parallel to the transverse slat. The lower surface of the positioning plate is provided with a positioning structure that cooperates with the upper end face of the external casting of the outlet pipe, and the lower surface is provided with a positioning structure that cooperates with the upper end face of the external casting of the outlet pipe. It can be seen that the line drawing tool is not provided with any mechanism, and when in use, it is only necessary to manually place the straight ruler in the selected placement groove. Since the use of the marking tool depends on the fit between the positioning plate and the upper end surface of the corresponding casting, the fit is a relatively tight shaft-hole fit. In other words, its scope of application is relatively single. In addition, the tool also requires assistance such as a triangle ruler, and often a single person cannot complete the operation. Utility Model Content

[0006] The utility model aims to provide a line drawing tool with relatively good adaptability and relatively simple structure, which is a special tool for drawing the center line of a plate with parallel edges.

[0007] In an embodiment of the present utility model, a line drawing tool is provided, which is a special tool for drawing a center line of a plate with parallel edges. The line drawing tool comprises:

[0008] A hinged parallelogram frame, wherein a pair of frames of the hinged parallelogram frame are selected as sliding frames, and another pair of frames are selected as connecting frames;

[0009] A bracket plate is provided, which is parallel to the sliding frame or the connecting frame; if the bracket plate is parallel to the sliding frame, the two ends of the bracket plate are hinged to the middle of the connecting frame, and a pen holder is provided on the bracket plate; if the bracket plate is parallel to the connecting frame, the two ends of the bracket plate are hinged to the sliding frame, and a pen holder is provided in the middle of the bracket plate.

[0010] Optionally, at least the sliding frame is a slat structure, the opposite sides of the two sliding frames are sliding surfaces, and the sliding frame is located at the bottom of the line drawing tool.

[0011] Optionally, a sliding sheet is mounted on the sliding surface or a friction-reducing layer is formed on the sliding surface.

[0012] Optionally, the sliding sheet is a polytetrafluoroethylene sheet, and the friction-reducing layer is a polytetrafluoroethylene coating.

[0013] Optionally, an operating handle is provided on the outer side of the sliding frame.

[0014] Optionally, the hinged parallelogram frame, and the bracket plate form a layered structure;

[0015] Correspondingly, the sliding frame, the connecting frame, and the bracket plate are all plate conditions; the sliding frame is located at the bottom layer, the connecting frame is located at the middle layer, and the bracket plate is located at the top layer.

[0016] Optionally, the hinges of the hinge parallelogram frame are formed by bolts and nuts, and the corresponding bolts constitute hinge axes.

[0017] Optionally, the transverse connecting plate has a through hole at a position corresponding to the hinge, and the through hole is a countersunk hole;

[0018] The corresponding nut is received in the counterbore.

[0019] Optionally, the pen holder is a paintbrush mounting hole or a paintbrush clamping seat;

[0020] When the brush installation hole is used, the brush installation hole constitutes the center hole of the bracket plate, and the brush and the center hole are interference-connected or the outer diameter of the brush is smaller than the diameter of the center hole;

[0021] If the outer diameter of the paintbrush is smaller than the diameter of the center hole, an elastic sleeve is provided to fill the gap between the paintbrush and the center hole.

[0022] Optionally, the thickness of the sliding frame is not less than 10 mm and not more than 20 mm.

[0023] It should be known that tooling generally has the requirement of simplicity, and the line drawing tooling according to the embodiment of the utility model is essentially derived from the hinge parallelogram mechanism, which includes four frames and a bracket plate, and the overall structure is very compact, which meets the requirement of simplicity of the tooling. When in use, the operator can use one pair of frames as sliding frames, hold the sliding frames located on the left and right with the left and right hands, and make the surfaces opposite to the two sliding frames fit the parallel sides of the workpiece accordingly. It should be known that due to the use of the hinge parallelogram frame, the other pair of frames, that is, the rod length of the connecting frame (which meets the rod length of the hinge parallelogram mechanism) can adapt to various workpieces of different widths, and has better adaptability. And this adaptability only requires the operator to manually operate the two sliding frames to clamp on the workpiece to achieve, without the need for other special operations, and the operation is also very simple. Then a bracket plate is installed on the hinge parallelogram frame, and a pen holder is provided on the pen holder to draw the center line. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the top view structure of the line drawing tool in one embodiment.

[0025] Figure 2 for Figure 1 AA section view.

[0026] Figure 3 It is a schematic diagram of the left view of the structure of the line drawing tool in one embodiment.

[0027] Figure 4 It is a schematic diagram of the main cross-sectional structure of the connection frame in one embodiment.

[0028] In the figure: 1. rear transverse connecting plate, 2. left side slide plate, 3. middle marking plate, 4. marking hole, 5. main hinge assembly, 6. secondary hinge assembly, 7. front transverse connecting plate, 8. right side slide plate, 9. nut, 10. through hole. DETAILED DESCRIPTION

[0029] As mentioned above, since the tooling is generally concise, the line drawing tooling is briefly described in the embodiments of the utility model, and technicians in this field can still implement it without any creative work.

[0030] Here, the applicable object is first clarified, that is, the applicable workpiece, which is specifically a workpiece with parallel edges, and in more applications, a plate with a pair of parallel edges. The so-called center line refers to the center line parallel to the pair of parallel edges.

[0031] For the convenience of description, the basic reference system of the line drawing tool is defined by the operating angle. When drawing, the operator holds the line drawing tool in both hands and has a definite left and right. At this time, the side of the line drawing tool facing the operator is called the rear side, and the side opposite to the rear side is called the front side.

[0032] Figure 1 The illustrated marking tool only uses five plates, namely the rear transverse connecting plate 1, the front transverse connecting plate 7, the left and right slide plates 8, and the middle marking plate 3 shown in the figure, wherein the rear transverse connecting plate 1, the front transverse connecting plate 7, the left and right slide plates 8 are assembled into a hinged parallelogram frame through the main hinge components 5 at the four corners.

[0033] The property of the hinged parallelogram frame is that no matter how the angle between adjacent frames changes, a pair of opposite frames always remain parallel, which provides a better condition for using the hinged parallelogram frame to adapt to workpieces of different widths.

[0034] At the same time, since only five plate conditions are used as a whole, the overall structure is very compact, and based on the above-mentioned properties of the hinged parallelogram frame, the operation is also extremely convenient.

[0035] It should be noted that Figure 1 The illustrated structure is merely a preferred choice of structure and component type. From the perspective of their functional realization, the left and right frames, i.e., the left skateboard 2 and the right skateboard 8, only need to ensure that the relative surfaces are flat. As for the rear transverse connecting plate 1 and the front transverse connecting plate 7, rods can be used instead of plates.

[0036] For example, the middle drawing board 3 may also be replaced by a rod, as long as the pen holder can be reliably fixed.

[0037] From the above description, it can be known that the hinge parallelogram frame has two pairs of frames, one pair of frames is a sliding frame for providing a guide for sliding drawing lines, and the other pair of frames is mainly used to provide a connection so that the hinge parallelogram frame becomes a whole.

[0038] Figure 1 The illustrated middle line drawing board 3 is a special case, which is parallel to the two sliding frames, located in the middle of the space between the two sliding frames, and has a line drawing hole 4 in the middle. This is an inevitable structure for the middle line drawing board 3 to be parallel to the two sliding frames, so that it can be ensured that no matter how the distance between the two sliding frames changes, the middle line drawing board 3 is always in the middle of the space between the two sliding frames. For the convenience of distinction, this special case is called the first embodiment.

[0039] Another optional method is the case where the middle drawing board 3 is parallel to the connecting frame, in which case it is only necessary to ensure that, for example, the drawing hole 4 is located in the middle of the middle drawing board 3, and the middle drawing board 3 does not need to be located in the middle of the space between the two connecting frames. This other optional method is called the second embodiment.

[0040] Different from the first embodiment, the middle line drawing board 3 in the second embodiment is subjected to the force in the front-back direction during use, which may cause the middle line drawing board 3 to deform uncontrollably. In the first embodiment, the force bearing direction of the middle line drawing board 3 is the extension direction of the middle line drawing board 3, and the influence of the force in the line drawing direction is relatively small. Therefore, the first embodiment is a preferred embodiment.

[0041] Figure 1 The drawing hole 4 in the drawing can be understood as a special pen holder. The drawing hole 4 has a simple structure, and most pens are rotating bodies or regular polygons. The lines drawn on the workpiece are mostly temporary lines, and temporary lines are generally drawn with pencils. Pencils are generally cylindrical or regular hexagonal. Therefore, the drawing hole 4 can be connected with the drawing hole 4 by an interference fit, that is, the paintbrush is pushed into the drawing hole 4 by pressing. Since the lead of a pencil is generally located in the middle of the pencil, based on the interference fit, it has a better pen tip centering performance.

[0042] In some implementations, in order to accommodate different pencils (most pencils have a standard diameter), the drawing hole 4 can be opened slightly larger, and then adjusted using a rubber sleeve on the pencil, so that the drawing hole 4 can accommodate more types of pencils.

[0043] It should be known that in the mechanical field, such as compasses, they generally have a pen clip to facilitate replacement and clamping of pencils, for example. Therefore, in some embodiments, the pen holder is provided in the form of a pen clip.

[0044] As a special case, a pencil with a refill, such as a mechanical pencil, can be selected, which can be fixed in configuration without the need for frequent replacement of the pencil.

[0045] For the convenience of observation, the support plate such as the middle line drawing plate 3 needs to be located higher than the sliding frame.

[0046] Under this condition, three types of components can be arranged in an overlapping manner. The first component is the sliding frame, which is located at the bottom, followed by the connecting frame, which is located in the middle layer, and the bracket plate is located at the top layer. When in use, the outline of the workpiece will not exceed the connecting frame. The thickness of the connecting frame determines the observation space of the bracket plate, so the observation space can be adjusted by the thickness of the connecting plate frame.

[0047] In order to distinguish the slats and the rods, the support height of the connecting frame is a better descriptive parameter. The support height should not be less than 10mm, but should not be higher than 20mm. If it is too small, the observation space is too small. If it is too high, for example, the turning torque of a pencil when drawing lines will be relatively large.

[0048] As for the thickness of the sliding frame, it is generally between 10mm and 20mm.

[0049] It is more conducive to the implementation of layered arrangement if all the three types of components mentioned above are made of slats. For details, please refer to Figures 1 to 3 , the three figures can clearly show the lath characteristics of the three types of components, and the comparison Figure 2 and Figure 3 It can be seen that the three types of components have typical layered layout characteristics.

[0050] The three types of components in the form of slats are advantageous for the aforementioned layered arrangement, but it is pointed out in the foregoing that only the sliding frame may have slat features.

[0051] The inner surface of the sliding frame is the surface opposite to the two sliding frames. In order to facilitate workers' operation, the sliding frame should be a relatively smooth surface. The surface can be provided with a sliding sheet, such as a polytetrafluoroethylene sliding sheet, or a coating can be made, such as spraying polytetrafluoroethylene to form a polytetrafluoroethylene coating.

[0052] For easy operation, an operating handle is provided on the outer side of the sliding frame. As mentioned above, based on the relative relationship between the two sliding frames, the relative direction is inward, and vice versa, outward, so the outer side of the sliding frame here is determined.

[0053] Regarding the hinge of the hinge parallelogram frame, it can be made of a headed pin shaft and a cotter pin. This is common knowledge in the mechanical field and will not be elaborated here.

[0054] Another hinge that is relatively easy to disassemble and adjust can be formed by bolts and nuts 9, where the corresponding bolts constitute the hinge axis, that is, the bolts pass through the corresponding bolt holes and are locked using, for example, nuts 9.

[0055] exist Figure 4 The illustrated structure is a connecting frame, in which a bolt hole is schematically shown. The bolt hole has a countersunk hole, and a nut 9 can be accommodated in the countersunk hole to reduce interference. The rest of the bolt hole is a light hole 10.

Claims

1. A line drawing tool, which is a special tool for drawing the center line of a plate with parallel edges, characterized in that: The line drawing tool comprises: A hinged parallelogram frame, wherein a pair of frames of the hinged parallelogram frame are selected as sliding frames, and another pair of frames are selected as connecting frames; A bracket plate is provided, which is parallel to the sliding frame or the connecting frame; if the bracket plate is parallel to the sliding frame, the two ends of the bracket plate are hinged to the middle of the connecting frame, and a pen holder is provided on the bracket plate; if the bracket plate is parallel to the connecting frame, the two ends of the bracket plate are hinged to the sliding frame, and a pen holder is provided in the middle of the bracket plate.

2. The line drawing tool according to claim 1, characterized in that: At least the sliding frame is a slat structure, the opposite sides of the two sliding frames are sliding surfaces, and the sliding frame is located at the bottom of the line drawing tool.

3. The line drawing tool according to claim 2, characterized in that: A sliding sheet is mounted on the sliding surface or a friction-reducing layer is formed thereon.

4. The line drawing tool according to claim 3, characterized in that: The sliding sheet is a polytetrafluoroethylene sheet, and the friction-reducing layer is a polytetrafluoroethylene coating.

5. The line drawing tool according to claim 1, characterized in that: An operating handle is arranged on the outer side of the sliding frame.

6. The line drawing tool according to claim 1, characterized in that: The hinged parallelogram frame and the bracket plate constitute a layered structure; Correspondingly, the sliding frame, the connecting frame, and the bracket plate are all plate conditions; the sliding frame is located at the bottom layer, the connecting frame is located at the middle layer, and the bracket plate is located at the top layer.

7. The line drawing tool according to claim 1, characterized in that: The hinge of the hinge parallelogram frame is formed by bolts and nuts, and the corresponding bolts constitute the hinge axis.

8. The line drawing tool according to claim 7, characterized in that: The transverse connecting plate is provided with a through hole at a position corresponding to the hinge, and the through hole is a countersunk hole; The corresponding nut is received in the counterbore.

9. The line drawing tool according to claim 1, characterized in that: The pen holder is a paintbrush mounting hole or a paintbrush clamping seat; When the brush installation hole is used, the brush installation hole constitutes the center hole of the bracket plate, and the brush and the center hole are interference-connected or the outer diameter of the brush is smaller than the diameter of the center hole; If the outer diameter of the paintbrush is smaller than the diameter of the center hole, an elastic sleeve is provided to fill the gap between the paintbrush and the center hole.

10. The line drawing tool according to claim 1, characterized in that: The thickness of the sliding frame shall not be less than 10 mm and not more than 20 mm.

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