A portable wall line drawing tool

Abstract

The utility model discloses a portable wall line drawing tool, which aims to solve the technical problems of high risk and low efficiency in high-altitude line drawing operation in the prior art. The tool mainly comprises an extension module, a sliding module and an extension rod. The core improvement lies in that the extension module is composed of an extension outer box with a sliding groove and an extension inner box sleeve with a sliding groove. By setting a smooth transition groove at the end of the extension inner box, smooth sliding of the sliding module in the full length range of the extension is realized. The sliding module is internally provided with an elastic line drawing module (such as a line drawing roller or a line drawing pen) and a lever type constant pressure ink supply mechanism, which ensures that the line drawing head can adapt to the concave-convex wall surface, keeps the line drawing pressure stable and the ink supply uniform. In addition, the level, laser and continuous scale line are integrated, which assists in rapid and accurate positioning. The utility model can enable the operator to safely complete the continuous and smooth line drawing operation on the high wall surface on the ground, and significantly improves the construction efficiency and quality.

Description

Technical Field

[0001] This utility model belongs to the field of building construction tools technology, specifically relating to a portable wall drawing tool. Background Technology

[0002] During construction work on building walls, wall marking operations present significant efficiency and safety issues. According to recent safety reports from China's building decoration industry, accidents involving traditional ladders account for 15.3% of all falls from heights during renovations, and the work is inefficient: marking lines at a height of 3 meters takes an average of 5-8 minutes, including time to climb and descend the ladder, while direct ground work takes only 1-2 minutes. Existing technologies such as CN210082754U and CN212044689U involve measuring and marking devices, but they do not solve core problems such as jamming of the telescopic interface and poor adaptability to uneven wall surfaces. On walls with an unevenness of ≥3mm, the breakage rate of marked lines reaches as high as 40%. Utility Model Content

[0003] The purpose of this utility model is to solve the above-mentioned technical problems and provide a portable wall drawing tool that is safe to operate, allows for continuous line drawing, and is highly adaptable to different wall surfaces.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A portable wall marking tool includes a telescopic module, a sliding module, and a telescopic rod;

[0006] The telescopic module includes a telescopic outer box and a telescopic inner box. Both the telescopic outer box and the telescopic inner box are U-shaped structures. The support legs of the telescopic outer box have a first sliding groove in the middle, and the support legs of the telescopic inner box have a second sliding groove in the middle. The openings of the two are opposite to each other, and the telescopic inner box is inserted into the first sliding groove and slides in cooperation.

[0007] The second slide groove inlet at the end of the telescopic inner box support leg is provided with a smooth transition groove;

[0008] The first ball groove is formed in the middle of the three surfaces of the first groove, and the second ball groove is formed in the middle of the three surfaces of the second groove. The depth of the second ball groove in the transition groove area is greater than the depth of the first ball groove, so that the balls of the sliding module can smoothly transition between the telescopic outer box and the telescopic inner box.

[0009] The sliding module includes a sliding box, two ink cartridges and a drawing module. The two ink cartridges are respectively fixed at the front and rear ends of the sliding box. A roller groove is opened in the middle of the sliding box, and the drawing module is located in the middle of the roller groove.

[0010] The line drawing module includes an elastic clamping mechanism and a line drawing head. The elastic clamping mechanism ensures that the line drawing head maintains a constant contact pressure with the wall surface during operation.

[0011] The sliding box is provided with balls on its top, bottom and side surfaces. The sliding box is set inside the telescopic outer box and the telescopic inner box, and the sliding box is slidably connected to the telescopic outer box and the telescopic inner box through the balls, the first ball groove and the second ball groove.

[0012] The telescopic rod is hinged to the sliding module.

[0013] Furthermore, the drawing head is a drawing roller, and the elastic clamping mechanism includes two bases, a lower roller support rod, two return springs, and a telescopic rod connector. The bases are L-shaped and symmetrically inverted and fixed on the top surfaces of the sliding boxes on both sides of the roller groove. A limit groove is vertically formed in the middle of the opposite surfaces of the two bases, and the lower end of the limit groove extends along the side wall of the roller groove to the middle of the side wall of the roller groove. The lower roller support rod is U-shaped, with its middle part serving as the central axis of the drawing roller, so that... The marking roller is located in the middle of the roller groove, and the two ends of the central shaft are placed on the lower end of the limiting groove. The two sides of the lower roller support rod are respectively located in the limiting grooves on both sides. The two return springs are respectively in the limiting grooves on both sides, with the lower end connected to the upper end of the lower roller support rod and the upper end pressing against the upper end of the limiting groove. The telescopic rod connector is U-shaped in general, with both ends symmetrically fixed on the top surface of the two bases. A hinged tee is provided in the middle of the telescopic rod connector, and the upper end of the telescopic rod is connected to the tee.

[0014] Furthermore, the elastic clamping mechanism also includes an upper roller support rod, the limiting groove is a stepped structure with a thicker bottom and a thinner top, the upper ends of the two return springs are provided with washers, the washers are locked at the steps of the limiting groove, the upper roller support rod bracket is an inverted U-shaped structure, the two ends are inserted into the upper narrow groove of the limiting groove, pass through the return spring and connect to the upper end of the lower roller support rod, and one side of the upper roller support rod is broken at the bend and connected by a connecting elbow.

[0015] Furthermore, the drawing head is a drawing roller, and the elastic clamping mechanism includes two bases, a telescopic rod connector, a crossbeam, and a third spring. The bases are rectangular structures, symmetrically fixed on the top surfaces of the sliding boxes on both sides of the roller groove. A movable chamber is symmetrically opened in the middle of the opposite surfaces of the two bases. The drawing roller is located in the middle of the roller groove, and the two ends of the central axis of the drawing roller rest in the grooves opened on the sliding boxes on both sides of the roller groove. The third spring has an overall inverted U-shaped structure, with both ends fixedly connected to the two ends of the central axis of the drawing roller. The two sides of the third spring are located inside the movable chamber. The crossbeam is fixed between the two bases directly above the third spring. The third spring is made of any one of spring steel, stainless steel, brass, polyoxymethylene, or polycarbonate. The telescopic rod connector is U-shaped, with both ends symmetrically fixed on the top surfaces of the two bases. A hinged tee is provided in the middle of the telescopic rod connector, and the upper end of the telescopic rod is connected to the tee.

[0016] Furthermore, the ink cartridge is equipped with a lever-type ink supply mechanism, including a hinge shaft hinged to the upper part of the side wall between the sliding box and the ink cartridge, a first spring piece hinged through the hinge shaft, and a compression spring connecting the end of the first spring piece to the bottom of the ink cartridge. The ink-absorbing cotton is tied to the bottom surface of the first spring piece, with one end of the ink-absorbing cotton resting on the drawing roller and the other end immersed in the ink. The ink cartridge is filled with ink, and the drawing roller is connected to the ink through the ink-absorbing cotton.

[0017] Furthermore, the drawing head is a drawing pen, and the elastic clamping mechanism includes a mounting base, a second spring, a pen cartridge mounting sleeve, and a pen cartridge. The mounting base is disposed on one side of the top surface of the sliding box. One end of the second spring is fixed to the top surface of the mounting base, and the other end extends to the center of the roller groove. The pen cartridge mounting sleeve has a U-shaped structure, with its bottom surface connected to the end of the second spring. The pen cartridge is hinged in the pen cartridge mounting sleeve via a pivot. The drawing pen is disposed inside the pen cartridge. The inner sidewalls of the pen cartridge mounting sleeve are symmetrically provided with arc-shaped limiting grooves. A limiting rod is provided on the pen cartridge at the position corresponding to the arc-shaped limiting groove, and the limiting rod extends into the arc-shaped limiting groove.

[0018] Furthermore, the bottom of the pen cartridge is provided with a threaded pen cartridge cover, and the top of the pen cartridge is provided with a pressure spring for pressing the drawing pen.

[0019] Furthermore, handles are provided at the bottom of the two side walls of the telescopic outer box.

[0020] Furthermore, a level is provided on the bottom surface of the telescopic outer box, and a laser is provided on the top surface of the telescopic inner box.

[0021] Furthermore, the telescopic outer box has several spring plungers evenly distributed on both side walls, and a first scale line on the front side wall. The telescopic inner box has several spring plunger holes evenly distributed on both side walls, which are adapted to the spring plungers, and a second scale line on the front side wall. The first scale line and the second scale line are continuous scale lines.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. This utility model, through the combined design of telescopic module and telescopic rod, allows operators to complete the drawing work on high walls without climbing ladders or scaffolding, and can do so from the ground. This fundamentally eliminates the safety risk of falling from heights, greatly reduces labor intensity and work difficulty, and can be operated by a single person. It is especially suitable for scenarios such as home decoration and rapid construction, and effectively improves construction efficiency.

[0024] 2. This utility model provides continuous ball bearing grooves, first ball bearing groove and second ball bearing groove, in the sliding grooves of both the telescopic outer box and the telescopic inner box, and designs a smooth transition groove at the interface of the telescopic inner box. This structure allows the balls of the sliding module to roll smoothly and seamlessly throughout the entire length of the telescopic module, effectively overcoming the jamming problem caused by the height difference at the telescopic interface, thereby ensuring the smoothness of the drawing process and the continuity and flatness of the lines.

[0025] 3. The line drawing module of this utility model adopts an elastic clamping mechanism. When the line drawing roller or line drawing pen encounters a protrusion or unevenness on the wall during the movement, the mechanism can provide effective buffering and self-adaptation, so that the line drawing head part can "lift-overtake-reset", avoiding tool damage, line interruption or ink splashing caused by hard collision, and ensuring that clear and continuous straight lines can be drawn under various wall conditions.

[0026] 4. Regarding the roller drawing method, this utility model designs a lever-type ink supply mechanism based on a spring and a spring. This mechanism uses the elastic force of the spring to keep the ink-absorbing cotton in constant pressure against the surface of the drawing roller through the first spring, ensuring that the ink is continuously and evenly transferred to the roller. This avoids the uneven ink supply, ink interruption or ink overflow that may occur in traditional drip or soaking methods, thus ensuring that the drawn lines have a consistent color depth and no breaks.

[0027] 5. This utility model integrates auxiliary functions such as a level, laser, continuous scale lines, and spring plunger positioning. The level and laser are used to quickly and accurately position and calibrate the vertical state of the tool. The continuous scale lines, in conjunction with the spring plunger, enable stepless, precise adjustment and reliable locking of the telescopic length. In addition, the tool provides replaceable drawing module rollers / pen, which users can flexibly choose according to the wall material and line requirements, greatly enhancing the practicality and applicability of the tool. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the working structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0030] Figure 3 for Figure 2 A magnified schematic diagram of a portion of region B in the middle;

[0031] Figure 4 This is a schematic diagram illustrating the working principle of the ink-absorbing cotton of this utility model;

[0032] Figure 5 This is a schematic diagram of the telescopic outer box structure of this utility model;

[0033] Figure 6 This is a schematic diagram of the telescopic inner box structure of this utility model;

[0034] Figure 7 for Figure 6 A magnified schematic diagram of a portion of region A in the middle;

[0035] Figure 8 This is a schematic diagram of the sliding module structure according to Embodiment 1 of this utility model;

[0036] Figure 9 This is a schematic diagram of the internal structure of the sliding module according to Embodiment 1 of this utility model;

[0037] Figure 10 for Figure 8 A schematic diagram of the left-side view structure;

[0038] Figure 11 for Figure 8 A schematic diagram of the intermediate cross-section structure;

[0039] Figure 12 for Figure 11 A magnified view of a portion of region C;

[0040] Figure 13 This is a schematic diagram of the marking roller and its support rod structure according to Embodiment 1 of this utility model;

[0041] Figure 14 This is a schematic diagram of the sliding module structure according to Embodiment 2 of this utility model;

[0042] Figure 15 for Figure 14 A schematic diagram of the intermediate cross-section structure;

[0043] Figure 16 This is a schematic diagram of the sliding module structure according to Embodiment 3 of this utility model;

[0044] Figure 17 for Figure 16 A schematic diagram of the intermediate cross-section structure;

[0045] Figure 18 This is a schematic diagram of the sliding module in operation according to Embodiment 3 of this utility model;

[0046] Figure 19 This is a schematic diagram of the pen cartridge mounting sleeve and pen cartridge mounting structure according to Embodiment 3 of this utility model;

[0047] In the diagram: 1-Telescopic outer box; 2-Telescopic inner box; 3-Handle; 4-Sliding module; 5-Telescopic rod; 6-Sliding box; 7-Ink cartridge; 8-Drawing roller; 9-Ball bearing; 10-Base; 11-First spring; 12-Hinge shaft; 13-Ink absorbent cotton; 14-Spring; 15-Ink; 16-Roller groove; 17-Limiting groove; 18-Lower roller support rod; 19-Reset spring; 20-Telescopic rod connector; 2 1-Mounting base; 22-Second spring; 23-Drawing pen; 24-Pen cartridge mounting sleeve; 25-Spindle; 26-Pen cartridge; 27-Pen cartridge cover; 28-Top pressure spring; 29-Arc-shaped limiting groove; 30-Limiting rod; 31-Crossbeam; 32-Third spring; 33-Moving compartment; 34-Laser; 35-Level; 36-Wall surface; 37-Upper roller support rod; 38-Connecting elbow; 39-Gasket;

[0048] 1.1 - First groove; 1.2 - First graduation line; 1.3 - Spring plunger; 1.4 - First ball groove;

[0049] 2.1 - Second groove; 2.2 - Second scale line; 2.3 - Spring plunger hole; 2.4 - Transition groove; 2.5 - Second ball groove. Detailed Implementation

[0050] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0051] Example 1

[0052] A portable wall marking tool includes a telescopic module, a sliding module 4, and a telescopic rod 5;

[0053] The telescopic module includes a telescopic outer box 1 and a telescopic inner box 2, both of which are U-shaped structures. The outer box 1 has a first sliding groove 1.1 in the middle of its legs, and the inner box 2 has a second sliding groove 2.1 in the middle of its legs. The openings of the two boxes are opposite each other. The inner box 2 is inserted into the first sliding groove 1.1 and slides in fit. The bottom of the two side walls of the outer box 1 is provided with handles 3. The bottom surface of the outer box 1 is provided with a level 35. The top surface of the inner box 2 is provided with a laser 34.

[0054] The telescopic outer box 1 has several spring plungers 1.3 evenly arranged on both side walls, and a first scale line 1.2 arranged on the front side wall. The telescopic inner box 2 has several spring plunger holes 2.3 evenly arranged on both side walls, which are adapted to the spring plungers 1.3, and a second scale line 2.2 arranged on the front side wall. The first scale line 1.2 and the second scale line 2.2 are continuous scale lines.

[0055] The inlet of the second sliding groove 2.1 at the end of the two legs of the telescopic inner box is provided with a smooth transition groove 2.4;

[0056] The first ball groove 1.4 is formed in the middle of the three surfaces of the first slide groove 1.1, and the second ball groove 2.5 is formed in the middle of the three surfaces of the second slide groove 2.1. The depth of the second ball groove 2.5 in the transition groove 2.4 area is greater than the depth of the first ball groove 1.4, so that the ball 9 of the sliding module 4 can smoothly transition between the telescopic outer box 1 and the telescopic inner box 2.

[0057] The sliding module 4 includes a sliding box 6, two ink cartridges 7 and a drawing module. The two ink cartridges 7 are respectively fixed at the front and rear ends of the sliding box 6. A roller groove 16 is opened in the middle of the sliding box 6, and the drawing module is located in the middle of the roller groove 16.

[0058] The line drawing module includes an elastic clamping mechanism and a line drawing head. The elastic clamping mechanism ensures that the line drawing head maintains a constant contact pressure with the wall surface during operation.

[0059] The sliding box 6 is provided with balls 9 on its top, bottom and side surfaces. The sliding box 6 is disposed inside the telescopic outer box 1 and the telescopic inner box 2, and the sliding box 6 is slidably connected to the telescopic outer box 1 and the telescopic inner box 2 through the balls 9, the first ball groove 1.4 and the second ball groove 2.5.

[0060] The telescopic rod 5 is hinged to the sliding module 4.

[0061] The drawing head is a drawing roller 8. The elastic clamping mechanism includes two bases 10, a lower roller support rod 18, two return springs 19, and a telescopic rod connector 20. The base 10 has an L-shaped structure and is symmetrically inverted and fixed on the top surface of the sliding box 6 on both sides of the roller groove 16. A limiting groove 17 is vertically formed in the middle of the opposite surfaces of the two bases 10, and the lower end of the limiting groove 17 extends along the side wall of the roller groove 16 to the middle of the side wall of the roller groove 16. The lower roller support rod 18 has a U-shaped structure, and its middle part serves as the central axis of the drawing roller 8, so that the drawing head... The line roller 8 is located in the middle of the roller groove 16, and the two ends of the central shaft are attached to the lower end of the limiting groove 17. The two sides of the lower roller support rod 18 are respectively located in the limiting groove 17 on both sides. The two return springs 19 are respectively in the limiting groove 17 on both sides, with the lower end connected to the upper end of the lower roller support rod 18 and the upper end pressing against the upper end of the limiting groove 17. The telescopic rod connector 20 is U-shaped in general, with both ends symmetrically fixed on the top surface of the two bases 10. The telescopic rod connector 20 has a hinged tee in the middle, and the upper end of the telescopic rod 5 is connected to the tee.

[0062] The elastic clamping mechanism also includes an upper roller support rod 37. The limiting groove 17 has a stepped structure that is thicker at the bottom and thinner at the top. The upper ends of the two return springs 19 are provided with washers 39. The washers are locked in the steps of the limiting groove 17. The bracket of the upper roller support rod 37 has an inverted U-shaped structure. Both ends are inserted into the upper narrow groove of the limiting groove 17, pass through the return springs 19, and connect to the upper end of the lower roller support rod 18. One side of the upper roller support rod 37 is broken at the bend and connected by a connecting elbow 38. The upper roller support rod 37 can ensure that the lower roller support rods 18 on both sides are balanced by force, prevent uneven force on both sides when the drawing roller 8 is drawing lines, and improve stability.

[0063] The ink cartridge 7 is equipped with a lever-type ink supply mechanism, including a hinge shaft 12 hinged to the upper part of the side wall between the sliding box 6 and the ink cartridge 7, a first spring piece 11 hinged through the hinge shaft 12, and a compression spring 14 connecting the end of the first spring piece 11 to the bottom of the ink cartridge 7. The ink-absorbing cotton 13 is tied to the bottom surface of the first spring piece 11, and one end of the ink-absorbing cotton 13 is placed on the drawing roller 8, and the other end is immersed in the ink 15. The ink cartridge 7 is filled with ink 15, and the drawing roller 8 is connected to the ink 15 through the ink-absorbing cotton 13.

[0064] Example 1 Performance Test Table

[0065] 3-meter line drawing time 105±15 seconds 315±45 seconds GB / T 23454-2009 Passability of uneven wall surfaces 100% pass rate for 5mm protrusions 3mm protrusion, 40% jamming rate Actual measurement Ink line continuity 100 meters without breaks A break occurs at 30 meters. Laboratory testing

[0066] Example 2

[0067] The difference between this embodiment and Embodiment 1 is that the elastic clamping mechanism of the drawing module is different, as detailed below:

[0068] The drawing head is a drawing roller 8. The elastic clamping mechanism includes two bases 10, a telescopic rod connector 20, a crossbeam 31, and a third spring 32. The base 10 is a rectangular structure, symmetrically fixed on the top surface of the sliding boxes 6 on both sides of the roller groove 16. A movable chamber 33 is symmetrically opened in the middle of the opposite surfaces of the two bases 10. The drawing roller 8 is located in the middle of the roller groove 16, and the two ends of the central shaft of the drawing roller 8 rest in the grooves opened on the sliding boxes 6 on both sides of the roller groove 16. The third spring... The third spring plate 32 has an inverted U-shaped structure, with both ends fixedly connected to the two ends of the central shaft of the drawing roller 8. The two sides of the third spring plate 32 are located inside the movable compartment 33. The crossbeam 31 is fixed between the two bases 10 directly above the third spring plate 32. The third spring plate 32 is made of spring steel. The telescopic rod connector 20 has an overall U-shape, with both ends symmetrically fixed on the top surface of the two bases 10. The telescopic rod connector 20 has a hinged tee in the middle, and the upper end of the telescopic rod 5 is connected to the tee.

[0069] The third spring plate 32 in this embodiment is made of 65Mn spring steel, which has excellent elastic fatigue strength. Tests show that the adaptive pressure of the marking roller 8 on the wall can be stabilized within the range of 5-8 Newtons. After passing over an obstacle, the marking roller 8 returns to its working position in less than 0.1 seconds, demonstrating rapid response. Compared to Embodiment 1, this structure has better passability for protrusions of 5-8 mm, and the structure is more compact. During its service life, tests show that the elastic force attenuation is less than 5% after more than 100,000 cycles.

[0070] The third spring 32 can also be made of any one of stainless steel, brass, polyoxymethylene, or polycarbonate.

[0071] Example 3

[0072] The difference between this embodiment and Embodiment 1 is that the structure of the line drawing module is different, as detailed below:

[0073] The drawing head is a drawing pen 23. The elastic clamping mechanism includes a mounting base 21, a second spring 22, a pen cartridge mounting sleeve 24, and a pen cartridge 26. The mounting base 21 is located on one side of the top surface of the sliding box 6. One end of the second spring 22 is fixed to the top surface of the mounting base 21, and the other end extends to the center of the roller groove 16. The pen cartridge mounting sleeve 24 has a U-shaped structure, and its bottom surface is connected to the end of the second spring 22. The pen cartridge 26 is hinged in the pen cartridge mounting sleeve 24 through a pivot 25. The drawing pen 23 is located inside the pen cartridge 26. The inner sidewalls of the pen cartridge mounting sleeve 24 are symmetrically provided with arc-shaped limiting grooves 29. The pen cartridge 26 at the corresponding position of the arc-shaped limiting grooves 29 is provided with a limiting rod 30, which extends into the arc-shaped limiting grooves 29.

[0074] The bottom of the pen cartridge 26 is provided with a threaded pen cartridge cover 27, and the top of the pen cartridge 26 is provided with a top pressure spring 28 for pressing the drawing pen 23.

[0075] This embodiment is particularly suitable for drawing lines on rough walls or putty layers. Under the action of the limiting rod 30 and the arc-shaped limiting groove 29, the drawing pen 23 always maintains an acute angle of 30-45 degrees with the wall surface, and the second spring 22 provides a constant pressure of approximately 3-5N. Tests show that this angle and pressure effectively reduce pen tip wear, and a single standard drawing pen 23 can complete a clear line of 50-60 meters. When encountering obstacles, the drawing pen 23 can easily jump over them, effectively avoiding jamming and pen breakage.

[0076] The working process of this utility model:

[0077] 1. Initial settings and length adjustment:

[0078] The operator first adjusts the length of the telescopic module according to the required height of the line to be drawn. Holding the handle 3 of the telescopic outer box 1, the operator pulls the telescopic inner box 2, allowing it to smoothly extend from the first slide groove 1.1 of the telescopic outer box 1. The first scale line 1.2 on the front of the telescopic outer box 1 and the second scale line 2.2 on the front of the telescopic inner box 2 form a continuous scale reference range of 0.8 meters to 2.5 meters, with a minimum division of 1 centimeter, used for precise length setting. When the telescopic inner box 2 moves to the desired position, the spring plungers 1.3 on both sides of the telescopic outer box 1 automatically engage with the corresponding spring plunger holes 2.3 on the telescopic inner box 2, achieving reliable locking and preventing accidental retraction. At the same time, the operator checks whether the tool is level using the level 35 at the bottom of the telescopic outer box 1, adjusting it if necessary. The laser 34 on the top surface of the telescopic inner box 2 can be activated, projecting a vertical laser line onto the wall 36 to assist in positioning the starting point and direction of the line.

[0079] 2. Selection and preparation of the line drawing module:

[0080] Install the appropriate line drawing module according to the wall material and the line drawing requirements, such as ink lines or chalk lines:

[0081] If using the drawing roller 8 in embodiment 1 or 2, ensure that both ink cartridges 7 are filled with ink 15. The lever-type ink supply mechanism operates automatically: the compression spring 14 pushes the first spring 11 to rotate around the hinge shaft 12, so that one end of the ink-absorbing cotton 13 attached to the bottom surface of the first spring 11 is always immersed in ink 15, and the other end is in constant pressure against the surface of the drawing roller 8, thereby achieving uniform ink supply.

[0082] If using the drawing pen 23 of Embodiment 3, a matching pen cartridge cap 27 is threadedly connected to the bottom of the pen cartridge 26 to secure drawing pens 23 of different diameters, such as chalk or markers. The top-pressure spring 28 inside the pen cartridge 26 pushes the drawing pen 23 downwards, ensuring the pen tip extends stably. The second spring 22 provides a constant pressure of 3-5N, keeping the pen tip 23 in contact with the wall surface.

[0083] Finally, connect the upper end of the telescopic rod 5 to the tee fitting on the telescopic rod connector 20 of the sliding module 4. The lower end of the telescopic rod 5 is held by one hand by the operator, while the other hand presses down on the handle 3 to prevent it from moving around.

[0084] 3. Line drawing operation execution:

[0085] The operator stands on the ground, holding handle 3 and telescopic rod 5, and raises the tool to a predetermined height on the wall 36. The tool is leveled using a level 35, and vertical alignment is assisted by a laser 34. Then, the sliding module 4 is slowly pushed along the telescopic module direction.

[0086] The sliding box 6 of the sliding module 4 rolls in the first ball groove 1.4 of the telescopic outer box 1 and the second ball groove 2.5 of the telescopic inner box 2 via balls 9 on its top, bottom, and side surfaces. Because the second groove 2.1 at the end of the telescopic inner box 2 has a smooth transition groove 2.4, and the second ball groove 2.5 is deeper than the first ball groove 1.4, the balls 9 can smoothly transition at the interface between the telescopic outer box 1 and the telescopic inner box 2, avoiding jamming and ensuring smooth sliding.

[0087] The line drawing module adapts to the contours of the wall:

[0088] In Embodiment 1, the drawing roller 8 is suspended by the roller support rod 18 and the return spring 19: when it encounters a wall protrusion, the drawing roller 8 is pushed upward, compressing the return spring 19, and the roller support rod 18 moves upward along the limiting groove 17; after passing the protrusion, the return spring 19 pushes the drawing roller 8 to return to its original position, maintaining a constant contact pressure with the wall to ensure continuous drawing.

[0089] In Example 2, the third spring plate 32 is made of spring steel and provides a constant pressure of 5-8N: when the marking roller 8 encounters an obstacle, the third spring plate 32 elastically deforms, allowing the marking roller 8 to be temporarily lifted and quickly return to its original position after passing the obstacle, with strong fatigue resistance.

[0090] In embodiment 3, the drawing pen 23 is hinged to the pivot 25 of the pen cartridge mounting sleeve 24, and the limiting rod 30 slides within the arc-shaped limiting groove 29, limiting the angle between the drawing pen 23 and the wall surface to always remain at an acute angle of 30-45°. The second spring piece 22 causes the tip of the drawing pen 23 to contact the wall surface with a pressure of 3-5N. When encountering unevenness, the pen tip can be slightly lifted and automatically reset to avoid pen breakage or jamming.

[0091] During this period, the ink supply system continues to operate: for the drawing roller 8, the ink absorbent cotton 13 uses capillary action to evenly transfer ink 15 from the ink cartridge 7 to the surface of the drawing roller 8; for the drawing pen 23, the top pressure spring 28 ensures that the pen tip continuously dispenses ink or powder.

[0092] 4. Completion and follow-up processing:

[0093] As the sliding module 4 moves from one end of the telescopic module to the other, a continuous, flat straight line is formed on the wall surface 36. The operator can easily move the tool to the next position and repeat the process to draw multiple lines. After use, clean the drawing roller 8 or replace the drawing pen 23, empty the ink cartridge 7, and retract the telescopic module to its minimum length for easy storage and carrying.

[0094] Through the above-described process, this invention enables ground-based operation of high-altitude line drawing, fundamentally eliminating the risk of falls from heights. The smooth transition of the sliding module and the adaptive design of the line drawing module ensure the continuity and quality of line drawing on uneven walls with a difference of ≥5mm. Auxiliary functions such as a level, laser, and graduated lines improve the accuracy and efficiency of line drawing. This tool is particularly suitable for scenarios such as building decoration and interior construction, and has advantages such as safe operation, high efficiency in line drawing, and wide adaptability.

Claims

1. A portable wall drawing tool, characterized in that, It includes a telescopic module, a sliding module (4), and a telescopic rod (5); The telescopic module includes a telescopic outer box (1) and a telescopic inner box (2). Both the telescopic outer box (1) and the telescopic inner box (2) are U-shaped structures. The outer box (1) has a first sliding groove (1.1) in the middle of its legs, and the inner box (2) has a second sliding groove (2.1) in the middle of its legs. The openings of the two are opposite each other, and the inner box (2) is inserted into the first sliding groove (1.1) and slides in cooperation. The second slide groove (2.1) at the end of the support leg of the telescopic inner box (2) is provided with a smooth transition groove (2.4). The first ball groove (1.4) is formed in the middle of the three surfaces of the first groove (1.1), and the second ball groove (2.5) is formed in the middle of the three surfaces of the second groove (2.1). The depth of the second ball groove (2.5) in the transition groove (2.4) area is greater than the depth of the first ball groove (1.4), so that the ball (9) of the sliding module (4) can smoothly transition between the telescopic outer box (1) and the telescopic inner box (2). The sliding module (4) includes a sliding box (6), two ink cartridges (7) and a drawing module. The two ink cartridges (7) are fixed at the front and rear ends of the sliding box (6) respectively. A roller groove (16) is opened in the middle of the sliding box (6), and the drawing module is set in the middle of the roller groove (16). The line drawing module includes an elastic clamping mechanism and a line drawing head. The elastic clamping mechanism ensures that the line drawing head maintains a constant contact pressure with the wall surface during operation. The sliding box (6) is provided with balls (9) on its top, bottom and side surfaces. The sliding box (6) is set inside the telescopic outer box (1) and the telescopic inner box (2). The sliding box (6) is slidably connected to the telescopic outer box (1) and the telescopic inner box (2) through the balls (9), the first ball groove (1.4) and the second ball groove (2.5). The telescopic rod (5) is hinged to the sliding module (4).

2. A portable wall line drawing tool according to claim 1, wherein The drawing head is a drawing roller (8). The elastic clamping mechanism includes two bases (10), a lower roller support rod (18), two return springs (19), and a telescopic rod connector (20). The base (10) is an L-shaped structure, symmetrically inverted and fixed on the top surface of the sliding box (6) on both sides of the roller groove (16). A limiting groove (17) is vertically opened in the middle of the opposite surfaces of the two bases (10), and the lower end of the limiting groove (17) extends along the side wall of the roller groove (16) to the middle of the side wall of the roller groove (16). The lower roller support rod (18) is a U-shaped structure, and its middle part serves as the central axis of the drawing roller (8). The drawing roller (8) is positioned in the middle of the roller groove (16), and the two ends of the central shaft are placed at the lower end of the limiting groove (17). The two sides of the lower roller support rod (18) are respectively located in the limiting groove (17) on both sides. The two return springs (19) are respectively in the limiting groove (17) on both sides, with the lower end connected to the upper end of the lower roller support rod (18) and the upper end pressing against the upper end of the limiting groove (17). The telescopic rod connector (20) is U-shaped in whole, with both ends symmetrically fixed on the top surface of the two bases (10). The telescopic rod connector (20) is provided with a hinged tee in the middle, and the upper end of the telescopic rod (5) is connected to the tee.

3. A portable wall line drawing tool according to claim 2, wherein The elastic clamping mechanism also includes an upper roller support rod (37), the limiting groove (17) is a stepped structure with a thicker bottom and a thinner top, the upper ends of the two return springs (19) are provided with pads (39), the pads are stuck in the step of the limiting groove (17), the upper roller support rod (37) bracket is an inverted U-shaped structure, the two ends are inserted into the upper narrow groove of the limiting groove (17) and pass through the return springs (19) to connect with the upper end of the lower roller support rod (18), one side of the upper roller support rod (37) is broken at the bend and connected by a connecting elbow (38).

4. A portable wall marking tool according to claim 1, characterized in that, The drawing head is a drawing roller (8). The elastic clamping mechanism includes two bases (10), a telescopic rod connector (20), a crossbeam (31), and a third spring (32). The base (10) is a rectangular structure, symmetrically fixed on the top surface of the sliding box (6) on both sides of the roller groove (16). The two bases (10) have symmetrically opened movable chambers (33) in the middle of their opposite surfaces. The drawing roller (8) is located in the middle of the roller groove (16), and the two ends of the central shaft of the drawing roller (8) are placed in the grooves opened on the sliding box (6) on both sides of the roller groove (16). The third spring (32) is integrally shaped. The inverted U-shaped structure is fixedly connected to the two ends of the central axis of the drawing roller (8). The two sides of the third spring (32) are located in the movable compartment (33). The crossbeam (31) is fixed between the two bases (10) directly above the third spring (32). The third spring (32) is made of any one of spring steel, stainless steel, brass, polyoxymethylene, and polycarbonate. The telescopic rod connector (20) is U-shaped in whole, and its two ends are symmetrically fixed on the top surface of the two bases (10). The telescopic rod connector (20) is provided with a hinged tee in the middle. The upper end of the telescopic rod (5) is connected to the tee.

5. A portable wall marking tool according to claim 2 or 4, characterized in that, The ink cartridge (7) is equipped with a lever-type ink supply mechanism, including a hinge shaft (12) hinged to the upper part of the side wall between the sliding box (6) and the ink cartridge (7), a first spring piece (11) hinged through the hinge shaft (12), and a compression spring (14) connecting the end of the first spring piece (11) to the bottom of the ink cartridge (7). The ink-absorbing cotton (13) is tied to the bottom surface of the first spring piece (11), and one end of the ink-absorbing cotton (13) is placed on the drawing roller (8), and the other end is immersed in the ink (15). The ink cartridge (7) is filled with ink (15), and the drawing roller (8) is connected to the ink (15) through the ink-absorbing cotton (13).

6. The portable wall line drawing tool according to claim 1, wherein The drawing head is a drawing pen (23). The elastic clamping mechanism includes a mounting base (21), a second spring (22), a pen cartridge mounting sleeve (24), and a pen cartridge (26). The mounting base (21) is located on one side of the top surface of the sliding box (6). One end of the second spring (22) is fixed to the top surface of the mounting base (21), and the other end extends to the center of the roller groove (16). The pen cartridge mounting sleeve (24) has a U-shaped structure, and its bottom surface is flush with the second spring. The end of the plate (22) is connected, and the pen cylinder (26) is hinged in the pen cylinder mounting sleeve (24) through the pivot (25). The drawing pen (23) is set in the pen cylinder (26). The inner sidewalls of the pen cylinder mounting sleeve (24) are symmetrically provided with arc-shaped limiting grooves (29). The pen cylinder (26) at the corresponding position of the arc-shaped limiting groove (29) is provided with a limiting rod (30). The limiting rod (30) extends into the arc-shaped limiting groove (29).

7. A portable wall line drawing tool according to claim 6, wherein The bottom of the pen cartridge (26) is provided with a threaded pen cartridge cover (27), and the top of the pen cartridge (26) is provided with a top pressure spring (28) for pressing the drawing pen (23).

8. The portable wall line drawing tool according to claim 1, wherein The telescopic outer box (1) has handles (3) at the bottom of its two side walls.

9. The portable wall line drawing tool according to claim 1, wherein The bottom surface of the telescopic outer box (1) is equipped with a level (35), and the top surface of the telescopic inner box (2) is equipped with a laser (34).

10. A portable wall line drawing tool according to claim 9, wherein The telescopic outer box (1) has several spring plungers (1.3) evenly distributed on both sides of the side wall, and a first scale line (1.2) on the front side wall. The telescopic inner box (2) has several spring plunger holes (2.3) evenly distributed on both sides of the side wall, which are adapted to the spring plungers (1.3), and a second scale line (2.2) on the front side wall.

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