Adjustable compass for drawing circle on sheet metal

Abstract

The utility model discloses an adjustable compass for drawing circle on metal plate, including base structure, when drawing circle on metal plate, base structure is fixed with metal plate material to determine the circle center position of drawing circle, rotary support arm structure, rotary support arm structure with base structure rotation cooperation, line drawing device, line drawing device with rotary support arm structure sliding cooperation to change the radius of drawing circle, and the device can be fixed firmly, draw line stably, and can accurately and quickly adjust the radius.

Description

Technical Field

[0001] This utility model relates to an adjustable drawing compass for drawing circles on a metal plate. Background Technology

[0002] In the field of sheet metal processing, such as sheet metal work, shipbuilding, and steel structure manufacturing, it is often necessary to accurately draw circular or arc outlines on large steel plates, iron plates, and other metal sheets as a reference for subsequent cutting, welding, and other processes. Currently, for drawing lines of large radius circles, traditional drawing compasses or self-made tools are commonly used.

[0003] Traditional drawing compasses typically consist of a fixed center pin and an adjustable arm with a drawing tool. However, these tools have significant drawbacks when applied to large, smooth metal sheets: First, the fixed center pin is prone to slippage, causing the center to shift during the drawing process and compromising accuracy; second, the pressure of the drawing tool is difficult to control—too little pressure results in unclear lines, while too much pressure can cause the tool to deviate from its trajectory due to vibration, or even scratch the surface of the sheet; furthermore, the radius adjustment mechanism of traditional drawing compasses is relatively crude, lacking precise scale indications, making it difficult to quickly and accurately set the required radius, and the adjustment and locking process is also cumbersome.

[0004] Therefore, there is a need in the prior art for a metal plate drawing tool that can be firmly fixed, draw lines stably, and has a radius that can be adjusted accurately and quickly. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an adjustable drawing compass for drawing circles with a metal plate that can be firmly fixed, draw lines stably, and have a radius that can be adjusted accurately and quickly.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] An adjustable scribing tool for drawing circles on a metal plate includes:

[0008] The base structure is fixed to the metal plate when drawing a circle to determine the position of the center of the circle.

[0009] A slewing support arm structure, wherein the slewing support arm structure is rotatably engaged with the base structure.

[0010] A line-drawing device, which slides in conjunction with the rotary support structure to change the radius of the circle being drawn.

[0011] Preferably, the base structure includes a base, a central shaft, and a connecting component. The central shaft is fixedly installed at the top center of the base. The base is hollow inside. The connecting component is fixedly installed in the hollow part of the base. The lower end of the connecting component is used to connect a metal plate. The slewing arm structure rotates coaxially along the central shaft.

[0012] Preferably, the connecting component is an electromagnet, the shaft is a hollow shaft that communicates with the base, and the wire harness connecting the electromagnet passes through the shaft.

[0013] Preferably, the slewing arm structure includes a slewing sleeve and a support arm rod. The slewing sleeve is coaxially sleeved outside the shaft rod, and a bearing is fitted between the slewing sleeve and the shaft rod. The support arm rod is fixed to the outside of the slewing sleeve and located on the diameter line of the slewing sleeve. The support arm rod has a sliding groove along the diameter direction of the slewing sleeve, and the sliding groove passes through the support arm rod in a direction away from the slewing sleeve. A closing plate is fixed to the end of the support arm rod away from the slewing sleeve. The marking device slides along the sliding groove.

[0014] Preferably, the drawing device includes a slider and a drawing component. A mounting hole is provided at the top center of the slider, through which the drawing component is mounted. The slider fits into the groove. Grooves are provided on the front and rear sides of the slider, and the support arm fits into the grooves, allowing the slider to slide laterally only along the support arm. A first groove communicating with the groove is provided on the front side of the support arm, and a threaded hole corresponding to the first groove is provided on the front side of the slider. A locking screw is screwed into the threaded hole, and after the locking screw is screwed in, its end acts on the outer end face of the support arm, thus fixing the position of the slider. A pointer is fixed to the front end of the slider, and a scale corresponding to the pointer is provided at the front end of the support arm, with the starting point of the scale being the axis of the rotating sleeve.

[0015] Preferably, the marking component includes a slide rod, a bottom cover, a spring, a marking cone, and an adjusting nut. A threaded rod is coaxially arranged at the top of the slide rod, the diameter of which is smaller than the diameter of the slide rod. A limiting plate is provided at the top of the marking cone, the diameter of which is larger than the upper diameter of the marking cone. The diameter of the marking cone gradually decreases downwards. The marking cone passes through the axis of the bottom cover, and the limiting plate is confined inside the bottom cover. The bottom cover and the slide rod are detachably connected, and the limiting plate is clamped after the bottom cover and the slide rod are connected. The slide rod is fitted with a transition hole, allowing it to slide and rotate coaxially along the mounting hole. The threaded rod passes upwards through the mounting hole and engages with the adjusting nut. The spring is sleeved on the slide rod, acting between the slide rod and the bottom cover. Under the action of the spring, the bottom tip of the marking cone acts on the metal plate to be marked.

[0016] Preferably, a pull handle is fixedly installed on the outside of the adjusting nut.

[0017] Preferably, a rubber washer is glued to the lower end of the adjusting nut, and the lower end face of the rubber washer is used to contact the slider.

[0018] Preferably, a gasket is provided on the top of the limiting plate, and the gasket is squeezed after the slide rod and the bottom cover are engaged.

[0019] The beneficial effects of this utility model are:

[0020] Advantage 1: Reliable fixation and precise centering: By using an electromagnet as a connecting component, the base can be instantly and firmly attached to the surface of the metal plate, providing strong holding force and effectively avoiding accidental deviation of the center during the drawing process, thus ensuring the accuracy of the drawing from the source.

[0021] Second advantage: precise and convenient radius adjustment. By sliding the slider in conjunction with the scaled support arm and setting the pointer and scale, the operator can directly and accurately set the required radius value, realizing quantitative adjustment, avoiding estimation errors, and greatly improving work efficiency and line drawing accuracy.

[0022] Thirdly, the line drawing is clear and stable: the line drawing device uses a spring to provide controllable and continuous downward pressure, so that the line drawing cone can press against the metal plate surface to make clear scratches. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is the front view of the device;

[0025] Figure 2 This is a bottom view of the device;

[0026] Figure 3 This is a structural diagram of the line drawing device;

[0027] Figure 4 This is a sectional view at point AA;

[0028] Figure 5 This is a schematic diagram showing the fit between the support arm and the slider. Detailed Implementation

[0029] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0030] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0031] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] See Figure 1 An adjustable scribing tool for drawing circles on a metal plate, as shown, includes:

[0035] When drawing a circle on a metal plate, the base structure 1 is fixed to the metal plate to determine the position of the center of the circle.

[0036] The slewing arm structure 2 is rotatably coupled to the base structure 1.

[0037] The line drawing device 3 is slidably engaged with the rotary support arm structure 2 to change the radius of the circle being drawn.

[0038] See Figure 1 and Figure 2As shown, the base structure 1 includes a base 11, a central shaft 12, and a connecting component 13. The central shaft 12 is fixedly installed at the top center of the base 11. The base 11 is hollow inside. The connecting component 13 is fixedly installed in the hollow part of the base 11. The lower end of the connecting component 13 is used to connect a metal plate. The slewing arm structure 2 rotates coaxially along the central shaft 12.

[0039] The connecting component 13 is an electromagnet, and the shaft 12 is a hollow shaft that is connected to the base 11. The wire harness connecting the electromagnet passes through the shaft 12.

[0040] In the above technical solution, the wire harness passes upward from the axis of the shaft rod 12. When drawing lines on the metal plate using the drawing device 3, the wire harness can be raised to avoid interference between the slewing arm structure 2 and the wire harness during rotation.

[0041] In the above technical solution, by turning on the switch paired with the electromagnet, the electromagnet is energized and magnetically attracted to the metal plate.

[0042] This device is mainly used for metal plates such as steel plates and iron plates that can be magnetically attracted.

[0043] See Figure 1 and Figure 2 As shown, the slewing arm structure 2 includes a slewing sleeve 21 and an arm rod 22. The slewing sleeve 21 is coaxially sleeved on the outside of the shaft rod 12. A bearing (not shown) is fitted between the slewing sleeve 21 and the shaft rod 12. Two bearings are arranged vertically to increase the stability of the slewing sleeve 21 during rotation. The arm rod 22 is welded and fixed to the outside of the slewing sleeve 21 and is located on the diameter line of the slewing sleeve 21. The arm rod 22 has a groove 23 along the diameter direction of the slewing sleeve 21. The groove 23 passes through the arm rod 22 in a direction away from the slewing sleeve 21. A closing plate 24 is fixed to the end of the arm rod 22 away from the slewing sleeve 21. The marking device 3 slides along the groove 23.

[0044] In the above technical solution, the drawing device 3 rotates around the axis rod 12 via the rotation of the support arm 22 to draw lines on the metal plate.

[0045] See Figures 1 to 5As shown, the line drawing device 3 includes a slider 31 and a line drawing component 32. A mounting hole 33 is provided at the top center of the slider 31, through which the line drawing component 32 is mounted. The slider 31 fits into the sliding groove 23. Grooves 34 are provided on the front and rear sides of the slider 31, and the support arm 22 fits into the grooves 34, allowing the slider 31 to slide laterally only along the support arm 22. A connecting groove is provided on the front side of the support arm 22. The first sliding groove 210 of the groove 23 is provided. The front side of the slider 31 is provided with a threaded hole 35 corresponding to the first sliding groove 210. A locking screw 36 is screwed into the threaded hole 35. After the locking screw 36 is screwed in, its end acts on the outer end face of the support arm to fix the position of the slider 31. A pointer 37 is fixed at the front end of the slider 31. The front end of the support arm is provided with a scale 211 that matches the pointer. The starting point of the scale 211 is the axis of the rotating sleeve 21.

[0046] In the above technical solution, the radius of the line is changed by sliding the slider 31, and the size of the line is determined by the cooperation of the pointer scale 211.

[0047] See Figures 1 to 5 As shown, the marking component 32 includes a slide rod 320, a bottom cover 321, a spring 322, a marking cone 323, and an adjusting nut 324. A threaded rod 325 is coaxially arranged at the top of the slide rod 320. The diameter of the threaded rod 325 is smaller than the diameter of the slide rod 320. A limiting plate 326 is provided at the top of the marking cone 323. The diameter of the limiting plate 326 is larger than the upper diameter of the marking cone 323. The diameter of the marking cone 323 gradually decreases downwards. The axis of the marking cone 323 corresponds to the tip of the pointer. The marking cone 323 passes through the axis of the bottom cover 321, and the limiting plate 326 is confined within the bottom cover 321. The bottom cover 321 is detachably connected to the slide rod 320 by a threaded connection. After the bottom cover 321 and the slide rod 320 are connected, the limiting plate 326 is clamped. The slide rod 320 is fitted with the mounting hole 33, and the slide rod 320 can slide and rotate coaxially along the mounting hole 33. The threaded rod 325 passes upward through the mounting hole 33 and engages with the adjusting nut 324. The spring 322 is sleeved on the slide rod 320 and acts between the slider 31 and the bottom cover 321. Under the action of the spring 322, the bottom tip of the drawing cone 323 acts on the metal plate to be drawn.

[0048] In the above technical solution, the spring force provides a downward pressure to the marking cone 323, and the tip of the marking cone 323 is used to mark the surface of the metal plate with scratches.

[0049] See Figure 3As shown, a handle 327 is fixedly installed on the outside of the adjusting nut 324.

[0050] When the position of the line needs to be changed by pulling the handle 327, the tip of the line-drawing cone 323 is separated from the metal plate by pulling the handle 327 upwards, then the slider 31 is slid laterally to the desired position, and then the handle 327 is released to complete the adjustment.

[0051] See Figure 3 As shown, a rubber washer 328 is glued to the lower end of the adjusting nut 324, and the lower end face of the rubber washer 328 is used to contact the slider 31.

[0052] See Figure 4 As shown, a gasket 329 is provided on the top of the limiting plate 326, and the slide rod 320 and the bottom cover 321 cooperate to squeeze the gasket 329.

[0053] The gasket 329 can be elastically deformed. When the gasket 329 is elastically compressed, the limiting plate 326 will not loosen, thereby increasing the stability of the drawing cone 323 when drawing lines.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0056] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adjustable compass for drawing circles with a metal plate, characterized in that: include: The base structure is fixed to the metal plate when drawing a circle to determine the position of the center of the circle. A slewing support arm structure, wherein the slewing support arm structure is rotatably engaged with the base structure. A line drawing device, which is slidably engaged with the rotary support arm structure to change the radius of the circle being drawn; The base structure includes a base, a central shaft, and a connecting component. The central shaft is fixedly installed at the top center of the base. The base is hollow inside. The connecting component is fixedly installed in the hollow part of the base. The lower end of the connecting component is used to connect a metal plate. The slewing arm structure rotates coaxially along the central shaft. The slewing arm structure includes a slewing sleeve and a support arm rod. The slewing sleeve is coaxially sleeved on the outside of the shaft rod, and a bearing is fitted between the slewing sleeve and the shaft rod. The support arm rod is fixed to the outside of the slewing sleeve and located on the diameter line of the slewing sleeve. The support arm rod has a sliding groove along the diameter direction of the slewing sleeve, and the sliding groove passes through the support arm rod in a direction away from the slewing sleeve. A closing plate is fixed to the end of the support arm rod away from the slewing sleeve. The marking device slides along the sliding groove. The line-drawing device includes a slider and a line-drawing component. A mounting hole is provided at the top center of the slider, through which the line-drawing component is mounted. The slider fits into a groove. Grooves are provided on the front and rear sides of the slider, and a support arm fits into the grooves, allowing the slider to slide laterally only along the support arm. A first groove communicating with the groove is provided on the front side of the support arm, and a threaded hole corresponding to the first groove is provided on the front side of the slider. A locking screw is screwed into the threaded hole, and after the locking screw is screwed in, its end acts on the outer end face of the support arm, fixing the position of the slider. A pointer is fixed to the front end of the slider, and a scale corresponding to the pointer is provided at the front end of the support arm, with the starting point of the scale being the axis of the rotating sleeve. The marking component includes a slide rod, a bottom cover, a spring, a marking cone, and an adjusting nut. A threaded rod is coaxially mounted on the top of the slide rod, with a diameter smaller than that of the slide rod. A limiting plate is mounted on the top of the marking cone, with a diameter larger than the upper diameter of the marking cone. The diameter of the marking cone gradually decreases downwards. The marking cone passes through the axis of the bottom cover, and the limiting plate is confined within the bottom cover. The bottom cover and the slide rod are detachably connected, and the limiting plate is clamped after the bottom cover and the slide rod are connected. The slide rod is fitted with a transition hole, allowing it to slide and rotate coaxially along the mounting hole. The threaded rod passes upwards through the mounting hole and engages with the adjusting nut. The spring is sleeved on the slide rod and acts between the slide rod and the bottom cover. Under the action of the spring, the tip of the marking cone acts on the metal plate to be marked.

2. The adjustable compass for drawing circles with a metal plate according to claim 1, characterized in that: The connecting component is an electromagnet, and the shaft is a hollow shaft that is connected to the base. The wire harness connecting the electromagnet passes through the shaft.

3. The adjustable compass for drawing circles with a metal plate according to claim 1, characterized in that: A handle is fixedly installed on the outside of the adjusting nut.

4. The adjustable compass for drawing circles with a metal plate according to claim 3, characterized in that: A rubber washer is glued to the lower end of the adjusting nut, and the lower end face of the rubber washer is used to contact the slider.

5. The adjustable compass for drawing circles with a metal plate according to claim 1, characterized in that: A gasket is provided on the top of the limiting plate, and the sliding rod and the bottom cover are engaged to compress the gasket.

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