A wheeled range finder

Abstract

The application relates to the technical field of range measuring instruments, and particularly discloses a wheeled range measuring instrument which comprises a supporting rod, one end of the supporting rod is provided with a limiting cylinder, a limiting frame is arranged in the limiting cylinder, the limiting frame is in sliding fit with the limiting cylinder, one end of the limiting cylinder away from the supporting rod is provided with a connecting rod, the connecting rod is rotationally connected with two rollers at two ends, and the limiting cylinder is provided with a limiting piece for limiting the rotation of the rollers. The application has the effect of improving the length measurement accuracy of the wheeled range measuring instrument.

Description

Technical Field

[0001] This application relates to the field of distance measuring instrument technology, and in particular to a wheel-type distance measuring instrument. Background Technology

[0002] Currently, there are many measuring tools available on the market for measuring and evaluating long distances between two points on the ground, in order to carry out professional surveying operations, road engineering, pipeline laying, wire and cable engineering and other construction operations.

[0003] In related technologies, common tools for measuring distance include measuring tapes, laser rangefinders, and wheel rangefinders. Measuring tapes are widely used due to their ease of operation and can meet the needs of short-distance measurements, but their measurement range is limited and prone to errors. Laser rangefinders have high accuracy, but their cost is also relatively high, and they are generally difficult for organizations to equip. Furthermore, the length range of laser rangefinders is limited, making it difficult to measure excessively long distances. Wheel rangefinders consist of a handle and a wheel that rolls on the ground. The number of revolutions the wheel makes on the ground multiplied by the circumference of the wheel equals the distance traveled. Wheel rangefinders have an unlimited measurement length range and are relatively inexpensive. However, if there are stones on the ground or the rangefinder needs to be lifted midway, the wheel may spin freely in the air due to inertia, which can affect the accuracy of the measurement length and lead to inaccurate measurements. Summary of the Invention

[0004] In order to improve the accuracy of length measurement by a wheel-type distance measuring instrument, this application provides a wheel-type distance measuring instrument that has the effect of improving the accuracy of length measurement by a wheel-type distance measuring instrument.

[0005] The wheel-type rangefinder provided in this application adopts the following technical solution: A wheel-type rangefinder includes a support rod, one end of which is provided with a limiting cylinder, a limiting frame is provided inside the limiting cylinder, the limiting frame is slidably engaged with the limiting cylinder, a connecting rod is provided at the end of the limiting cylinder away from the support rod, the two ends of the connecting rod are rotatably connected to rollers, and a limiting component is provided on the limiting cylinder to restrict the rotation of the rollers.

[0006] By adopting the above technical solution, the rollers on both sides of the connecting rod have a gap, which helps to avoid stones and other objects on the road surface, thus maintaining straight-line movement. During measurement, the operator holds the support rod and places the roller against the ground to be measured. Under the force of the operator, the support rod drives the limiting cylinder downward, causing the limiting component to disengage from the inner wall of the roller. When the measurement endpoint is reached or when it is necessary to pause, the operator lifts the support rod to lift the roller off the ground. The roller and the limiting frame move downward under their own weight, causing the inner wall of the roller to abut against the limiting component, thereby stopping the roller from rotating. This effectively improves the accuracy of the distance measuring instrument in measuring length.

[0007] Optionally, the limiting component is configured as a limiting rod, and multiple limiting rods are provided. The multiple limiting rods are located on both sides of the limiting cylinder and are perpendicular to the limiting frame. The limiting rods abut against the inner wall of the roller.

[0008] By adopting the above technical solution, the limiting rod abuts against the inner wall of the roller, which facilitates the application of radial braking force to the roller and forces it to stop rotating.

[0009] Optionally, an elastic element is provided at one end of the limiting rod away from the connecting rod. The elastic element is installed inside the limiting cylinder, and the other end of the elastic element abuts against the side of the limiting cylinder near the support rod.

[0010] By adopting the above technical solution, when the limiting cylinder moves towards the connecting rod, the elastic element can buffer the impact between the bottom of the limiting cylinder and the end of the limiting frame, thereby reducing mechanical wear and extending the service life of the limiting frame.

[0011] Optionally, the limiting frame is provided with a boss at one end near the connecting rod. When the limiting cylinder moves toward the connecting rod, the end of the limiting cylinder abuts against the boss.

[0012] By adopting the above technical solution, the boss limits the travel distance of the limiting cylinder, preventing the limiting cylinder from driving the limiting rod to continue to descend, which would cause the limiting rod to interfere with the internal structure of the roller, thus improving the stability of the moving limiting cylinder.

[0013] Optionally, a wheel track sensor is provided on the roller, and a display screen is provided on the support rod. The wheel track sensor is electrically connected to the display screen, and the wheel track sensor transmits the wheel track data to the display screen for display.

[0014] By adopting the above technical solution, the wheel track sensor transmits the collected data to the display screen in real time, making it convenient for operators to collect and measure length data in real time, and making the operation convenient.

[0015] Optionally, a support foot is rotatably provided on the limiting cylinder, and the support foot is installed between two rollers.

[0016] By adopting the above technical solution, the support feet do not interfere with the rotation of the rollers when they are retracted during measurement; when the measurement is paused, the support feet support the ground, reducing the risk of the rollers rotating unexpectedly due to the equipment tipping over, thus improving the stability of the roller measurement.

[0017] Optionally, the support leg includes a first connecting rod, a second connecting rod, a hinge portion, and a foot rod. One end of the first connecting rod is connected to the hinge portion, the other end of the first connecting rod is connected to one end of the foot rod, the other end of the foot rod is connected to one end of the second connecting rod, the other end of the second connecting rod is connected to the hinge portion, and the hinge portion is rotatably connected to the limiting cylinder.

[0018] By adopting the above technical solution, when the support leg is working, the first link, the second link, and the foot rod are supported by the hinge, so that the foot rod is in contact with the ground, thereby maintaining the vertical state of the support rod; when the support leg is not working, the first link and the second link are rotated synchronously to be parallel to the support rod by the hinge, reducing the friction between the foot rod and the ground and affecting the rotation state of the roller, thereby improving the stability of the roller measurement.

[0019] Optionally, the support rod includes a first telescopic rod and a second telescopic rod, the first telescopic rod being slidably connected inside the second telescopic rod, and the outer surface of the second telescopic rod being provided with a tensioning element, the tensioning element passing through the outer surface of the first telescopic rod and being threadedly connected to the first telescopic rod.

[0020] By adopting the above technical solution, the length of the support rod can be flexibly adjusted according to the height of the operator through the sliding adjustment of the first telescopic rod and the second telescopic rod, so that the roller always maintains the best contact angle with the ground.

[0021] Optionally, a handle is provided at the end of the first telescopic rod away from the second telescopic rod, and the display screen is installed at the end of the first telescopic rod near the handle.

[0022] By adopting the above technical solution, the handle is easy for operators to hold and for reading data on the display screen.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The gap between the rollers on both sides of the connecting rod helps to avoid stones and other debris on the road surface, thus maintaining a straight line of motion. During measurement, the operator holds the support rod and places the roller against the ground. Under manual force, the support rod drives the limiting cylinder downward, causing the limiting component to disengage from the inner wall of the roller. When the measurement endpoint is reached or a pause is needed, the operator lifts the support rod to lift the roller off the ground. The roller and the limiting frame move downward under their own weight, causing the inner wall of the roller to abut against the limiting component, thus stopping the roller from rotating. This effectively improves the accuracy of the distance measuring instrument in measuring length. 2. The wheel track sensor transmits the collected data to the display screen in real time, making it convenient for operators to collect and measure length data in real time, and the operation is convenient; 3. When the support leg is in operation, the first link, the second link, and the foot rod are supported by the hinge, so that the foot rod is in contact with the ground, thereby maintaining the vertical state of the support rod; when the support leg is not in operation, the first link and the second link are rotated synchronously to be parallel to the support rod by the hinge, reducing the friction between the foot rod and the ground and affecting the rotation state of the roller, thus improving the stability of the roller measurement. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the wheel-type rangefinder of this application; Figure 2 This is a cross-sectional view of the wheel-type rangefinder of this application.

[0025] Reference numerals in the attached drawings: 1. Support rod; 11. First telescopic rod; 12. Second telescopic rod; 2. Limiting cylinder; 3. Limiting frame; 4. Connecting rod; 5. Limiting component; 51. Limiting rod; 6. Elastic component; 7. Boss; 8. Wheelbase sensor; 9. Display screen; 10. Support foot; 101. First connecting rod; 102. Second connecting rod; 103. Hinge; 104. Foot; 13. Tensioning component; 14. Handle; 15. Clamp; 16. Roller. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0027] This application discloses a wheeled rangefinder, with reference to... Figure 1 The system includes a support rod 1, with a limiting cylinder 2 welded to one end of the support rod 1. The end of the limiting cylinder 2 away from the support rod 1 is open. A limiting frame 3 is slidably installed inside the limiting cylinder 2. A connecting rod 4 is welded to the end of the limiting frame 3 away from the limiting cylinder 2. The limiting frame 3 and the connecting rod 4 are perpendicularly arranged. Rollers 16 are rotatably connected to both ends of the connecting rod 4. A limiting component 5 is also installed on the limiting cylinder 2 to limit the rotation of the rollers 16. There is a gap between the two rollers 16 to avoid obstacles such as stones on the road surface, so that the rollers 16 move in a straight line. When the rangefinder needs to be lifted after the rollers 16 have finished measuring, the limiting component 5 locks the rollers 16, which can reduce the rollers 16 from spinning freely and thus improve the accuracy of the rangefinder's measurement length.

[0028] Reference Figure 1 In this embodiment of the application, the limiting member 5 is set as a limiting rod 51. There are two limiting rods 51, which are fixed on both sides of the limiting cylinder 2 respectively. The two limiting rods 51 abut against the inner wall of the roller 16 respectively. The outer surface of the limiting rod 51 is provided with anti-slip texture. The friction force generated by the compression between the limiting rod 51 and the inner wall of the roller 16 prevents the roller 16 from rotating, thereby locking the roller 16.

[0029] Reference Figure 1 and Figure 2 An elastic element 6 is installed inside the limiting cylinder 2. In this embodiment, the elastic element 6 is a compression spring. One end of the elastic element 6 is fixed to the end of the limiting frame 3 away from the connecting rod 4, and the other end abuts against the inner wall of the limiting cylinder 2. When the roller 16 stops rotating at a certain point on the measuring surface, the elastic element 6 helps to push the limiting cylinder 2 to drive the limiting rod 51 to reset upward and abut against the roller 16, thereby preventing the roller 16 from rotating. In addition, the elastic element 6 can buffer the impact force when the limiting frame 3 abuts against the limiting cylinder 2, reduce the wear of the limiting frame 3 caused by rigid collision, and help extend the service life of the limiting frame 3.

[0030] Reference Figure 1 The end of the limiting frame 3 away from the limiting cylinder 2 is integrally formed with a boss 7. The diameter of the boss 7 is larger than the inner diameter of the limiting cylinder 2. The end of the boss 7 away from the limiting cylinder 2 is fixed to the connecting rod 4. When the limiting cylinder 2 moves toward the connecting rod 4, the end of the limiting cylinder 2 near the connecting rod 4 abuts against the boss 7, which can restrict the limiting cylinder 2 from continuing to move and helps to reduce the collision between the limiting rod 51 and the internal structure of the roller 16.

[0031] Reference Figure 1 A support foot 10 is hinged to the limiting cylinder 2 and installed between two rollers 16. The support foot 10 includes a first connecting rod 101, a second connecting rod 4, a hinge part 103, and a foot rod 104. The first connecting rod 101, the second connecting rod 4, the hinge part 103, and the foot rod 104 are formed by bending a metal rod. One end of the first connecting rod 101 is connected to the hinge part 103, and the other end of the first connecting rod 101 is connected to one end of the foot rod 104. The other end of the foot rod 104... One end is connected to the second connecting rod 102, and the other end of the second connecting rod 102 is connected to the hinge part 103. The hinge part 103 is hinged to the outer wall of the limiting cylinder 2. When the roller 16 stops rotating, the first connecting rod 101, the second connecting rod 102 and the foot rod 104 are supported by rotating the hinge part 103. The support foot 10 and the two rollers 16 form a three-point support, so that the entire rangefinder stands upright, which helps to reduce the tilting of the roller 16 and improve the accuracy of the measurement data.

[0032] Reference Figure 1 A clamp 15 is fixedly installed on the support rod 1. The clamp 15 is made of elastic material. When the support foot 10 rotates to fit with the support rod 1, the clamp 15 clamps the foot rod 104, thereby fixing the support foot 10 after it is folded up.

[0033] Reference Figure 1 The support rod 1 includes a first telescopic rod 11 and a second telescopic rod 12. The first telescopic rod 11 is slidably connected inside the second telescopic rod 12, and the end of the second telescopic rod 12 away from the first telescopic rod 11 is fixed to the limiting cylinder 2. A tensioning element 13 is fixedly installed on the outer wall of the second telescopic rod 12. In this embodiment, the tensioning element 13 is a bolt. The tensioning element 13 passes through the first telescopic rod 11 and is threadedly fixed to the first telescopic rod 11. After adjusting the extension length of the first telescopic rod 11, the tensioning element 13 is tightened to fix the tensioning element 13 to the first telescopic rod 11, thereby realizing the length adjustment of the first telescopic rod 11, which is convenient for operators of different heights to use.

[0034] Reference Figure 1A handle 14 is fixedly installed at the end of the first telescopic rod 11 away from the second telescopic rod 12. A display screen 9 is fixedly installed at the upper end of the first telescopic rod 11 near the handle 14. The upper surface of the display screen 9 is provided with control buttons. A wheel track sensor 8 is fixedly installed on the side wall of the roller 16. The wheel track sensor 8 is electrically connected to the display screen 9. The wheel track sensor 8 can transmit the rotation data of the roller 16 to the display screen 9. At the same time, the control buttons on the display screen 9 can also control the start and stop of the wheel track sensor 8.

[0035] The implementation principle of a wheel-type rangefinder disclosed in this application is as follows: By setting rollers 16 at both ends of the connecting rod 4, it is easy to avoid obstacles such as stones on the road surface, reducing the deviation of the rangefinder. When the rangefinder encounters a large obstacle or needs to pause measurement, by lifting the rangefinder, the rollers 16 move downward under their own weight. The limiting rods 51 on both sides of the limiting cylinder 2 abut against the inner walls of the two rollers 16, which can lock the rollers 16 and prevent them from spinning freely. When the rangefinder is rolling to measure, the operator holds the handle 14 and presses down the support rod 1. There is a gap between the rollers 16 and the limiting rods 51, which allows the rollers 16 to rotate. The wheel distance sensor 8 on the side wall of the rollers 16 records the number of rotations of the rollers 16 in real time, and the data is then transmitted to the display screen 9 for the operator to observe the data intuitively. By having the two rollers 16 avoid stones on the road surface and by lifting the rollers 16 when they stop working, the rollers 16 can be prevented from spinning freely, effectively improving the accuracy of the rangefinder's measurement length.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wheel-type rangefinder, characterized in that: The device includes a support rod (1), one end of which is provided with a limiting cylinder (2), and a limiting frame (3) is provided inside the limiting cylinder (2). The limiting frame (3) is slidably engaged with the limiting cylinder (2). A connecting rod (4) is provided at the end of the limiting cylinder (2) away from the support rod (1). Rollers (16) are rotatably connected to both ends of the connecting rod (4). A limiting member (5) is provided on the limiting cylinder (2) to limit the rotation of the rollers (16).

2. The wheel-type rangefinder according to claim 1, characterized in that, The limiting member (5) is set as a limiting rod (51), and there are multiple limiting rods (51). The multiple limiting rods (51) are located on both sides of the limiting cylinder (2) and are perpendicular to the limiting frame (3). The limiting rods (51) abut against the inner wall of the roller (16).

3. The wheel-type rangefinder according to claim 1, characterized in that, The limiting frame (3) is provided with an elastic element (6) at one end away from the connecting rod (4). The elastic element (6) is installed inside the limiting cylinder (2). The other end of the elastic element (6) abuts against the side of the limiting cylinder (2) near the support rod (1).

4. The wheel-type rangefinder according to claim 1, characterized in that, The limiting frame (3) has a boss (7) at one end near the connecting rod (4). When the limiting cylinder (2) moves toward the connecting rod (4), the end of the limiting cylinder (2) abuts against the boss (7).

5. The wheel-type rangefinder according to claim 4, characterized in that, A wheel track sensor (8) is provided on the roller (16), and a display screen (9) is provided on the support rod (1). The wheel track sensor (8) is electrically connected to the display screen (9), and the wheel track sensor (8) transmits the wheel track data to the display screen (9) for display.

6. The wheel-type rangefinder according to claim 1, characterized in that, The limiting cylinder (2) is rotatably provided with a support foot (10), which is installed between two rollers (16).

7. The wheel-type rangefinder according to claim 6, characterized in that, The support foot (10) includes a first connecting rod (101), a second connecting rod (102), a hinge (103), and a foot rod (104). One end of the first connecting rod (101) is connected to the hinge (103), and the other end of the first connecting rod (101) is connected to one end of the foot rod (104). The other end of the foot rod (104) is connected to one end of the second connecting rod (102), and the other end of the second connecting rod (102) is connected to the hinge (103). The hinge (103) is rotatably connected to the limiting cylinder (2).

8. The wheel-type rangefinder according to claim 5, characterized in that, The support rod (1) includes a first telescopic rod (11) and a second telescopic rod (12). The first telescopic rod (11) is slidably connected inside the second telescopic rod (12). The outer surface of the second telescopic rod (12) is provided with a tensioning member (13). The tensioning member (13) passes through the outer surface of the first telescopic rod (11) and is threadedly connected to the first telescopic rod (11).

9. The wheel-type rangefinder according to claim 8, characterized in that, A handle (14) is provided at the end of the first telescopic rod (11) away from the second telescopic rod (12), and the display screen (9) is installed at the end of the first telescopic rod (11) near the handle (14).

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