A length measuring device

Abstract

This application provides a length measuring device, relating to the technical field of measurement, for measuring the total length of a rod and a line. The device includes a measuring groove, within which both the rod and the line are disposed, with the front end of the line fixed. It also includes a sliding sleeve, comprising balls and ball bearings, with the balls rotatably mounted on the ball bearings. Multiple sets of balls and ball bearings are provided, with the ball bearings evenly distributed along the circumferential direction of the sliding sleeve, and the balls sequentially distributed around the periphery of the sliding sleeve. The sliding sleeve is fitted onto the rod and moves in conjunction with it. The rotatable arrangement of the balls around the periphery of the sliding sleeve converts the sliding friction between the rod and the measuring groove into rolling friction, reducing the frictional force between the rod and the measuring groove, and allowing for smoother movement of the rod within the measuring groove. The ball bearings can control the rotation direction of the balls, ensuring that the rod moves along the axial direction of the measuring groove and preventing rotation along the circumferential direction, thereby preventing the line from becoming tangled and shortened, and ensuring the accuracy of measuring the total length of the rod and line.

Description

Technical Field

[0001] This application relates to the field of measurement technology, and in particular to a length measuring device. Background Technology

[0002] In many cases, it is necessary to measure the total length of the rod and line. For example, in platform fishing, there are strict limitations on the total length of the rod and line.

[0003] When measuring the total length of a rod and line, the main factors to consider include: how to ensure that the axial center of the rod and line is on the same straight line; how to ensure that the line is elastic and can be straightened without being overstretched, which could lead to incorrect measurement results; how to protect the surface of the rod from wear; and how to prevent the line from twisting or knotting due to axial rotation of the rod. Summary of the Invention

[0004] To address the shortcomings of the aforementioned background technology, a length measuring device is proposed.

[0005] This application provides a length measuring device for measuring the total length of a rod and a line. The device includes a measuring groove in which both the rod and the line are disposed, with the front end of the line fixed. It also includes a sliding sleeve, which includes balls and ball bearings. The balls are rotatably mounted on the ball bearings. Multiple sets of balls and ball bearings are provided, with the ball bearings evenly distributed along the circumferential direction of the sliding sleeve, and the balls sequentially distributed around the periphery of the sliding sleeve. The sliding sleeve is mounted on the rod and is linked to the rod.

[0006] Preferably, the periphery of the sliding sleeve also includes mounting grooves, which have outward-facing openings; the number of mounting grooves is the same as the number of balls, and the balls are arranged sequentially in the mounting grooves with their outer sides extending out of the openings.

[0007] Preferably, the balls are ellipsoidal in shape.

[0008] Preferably, the sliding sleeve further includes a first housing and a second housing, which are fastened together; the ball and the ball shaft are disposed between the first housing and the second housing.

[0009] Preferably, a positioning mechanism is provided between the first housing and the second housing. The positioning mechanism includes a positioning inner sleeve and a positioning outer sleeve. The positioning outer sleeve is fitted over the positioning inner sleeve and they fit together. The positioning inner sleeve is fixedly located at the center of the first housing, and the positioning outer sleeve is fixedly located at the center of the second housing.

[0010] Preferably, multiple sliding sleeves are provided and distributed along the axial direction of the rod.

[0011] Preferably, the outermost sliding sleeve is close to the rear end of the rod.

[0012] Preferably, the sliding sleeve is annular and the measuring groove is V-shaped.

[0013] Preferably, a scale is provided on the inner wall of the measuring groove, and the scale has length graduations along the axial direction of the measuring groove.

[0014] Preferably, the ball bearing shaft is made of metal and the balls are made of plastic.

[0015] The beneficial effects of this application are: Both the rod and the line are inside the measuring groove. The front end of the line is fixed. The rear end of the rod is pulled outward along the measuring groove. The axial centers of the rod and the line coincide. The line has elasticity and flexibility. Under the pull of the line, the rod will move inward appropriately. The sliding sleeve is fitted onto the rod and moves in conjunction with it. The ball bearings are rotatably located around the periphery of the sliding sleeve, converting the sliding friction between the rod and the measuring groove into rolling friction. This reduces the friction between the rod and the measuring groove, allowing the rod to move more smoothly within the measuring groove and ensuring more accurate results for measuring the rod and the total length of the line. At the same time, it prevents the surface of the rod from being worn due to direct contact with the measuring groove, thus protecting the surface of the rod. The ball bearings are rotatably mounted on the ball bearing shaft, which controls the rotation direction of the ball bearings. This ensures that the rod moves along the axial direction of the measuring groove, preventing the rod from rotating in the circumferential direction. This prevents the line from becoming tangled and shortened, further ensuring the accuracy of the total length of the measuring rod and line. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a length measuring device; Figure 2 This is a schematic diagram of the sliding sleeve; Figure 3 This is a schematic diagram of a partial structure of the sliding sleeve; Figure 4 This is a schematic diagram of the first shell. Figure 5 This is a schematic diagram of the second shell. Figure 6 This is a schematic diagram of the second housing from another angle.

[0018] Explanation of symbols in the diagram: 1 is a rod; 2 is a line; 3 is the measuring groove, and 31 is the scale. 4 is the sliding sleeve, 41 is the ball, 42 is the ball shaft, 43 is the mounting groove, 44 is the slot, 45 is the first housing, 46 is the second housing, 47 is the positioning mechanism, 471 is the positioning inner sleeve, and 472 is the positioning outer sleeve. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] Example like Figures 1 to 6 As shown, a length measuring device is used to measure the total length of a rod 1 and a line 2. It includes a measuring groove 3, in which both the rod 1 and the line 2 are disposed, and the front end of the line 2 is fixed. It also includes a sliding sleeve 4, which includes balls 41 and ball shafts 42. The balls 41 are rotatably mounted on the ball shafts 42. Multiple sets of balls 41 and ball shafts 42 are provided. The ball shafts 42 are evenly distributed along the circumferential direction of the sliding sleeve 4, and the balls 41 are sequentially distributed around the periphery of the sliding sleeve 4. The sliding sleeve 4 is mounted on the rod 1 and is linked to the rod 1.

[0021] Both rod 1 and line 2 are inside the measuring groove 3. The front end of line 2 is fixed. The rear end of rod 1 is pulled outward along the measuring groove 3. The axial centers of rod 1 and line 2 coincide. Line 2 has elasticity and flexibility. Under the pull of line 2, the rod will move inward appropriately. The sliding sleeve 4 is fitted onto the rod 1 and linked with the rod 1. The ball bearing 41 is rotatably disposed around the periphery of the sliding sleeve 4, which converts the sliding friction between the rod 1 and the measuring groove 3 into rolling friction, reducing the friction between the rod 1 and the measuring groove 3. The rod 1 moves more smoothly in the measuring groove 3, ensuring that the result of measuring the total length of the rod 1 and the line 2 is more accurate. At the same time, it avoids the surface of the rod 1 from being worn due to direct contact with the measuring groove 3, thus protecting the surface of the rod 1. The ball bearing 41 is rotatably mounted on the ball bearing shaft 42. The ball bearing shaft 42 can control the rotation direction of the ball bearing 41, ensuring that the rod 1 moves along the axial direction of the measuring groove 3, avoiding the rod 1 from rotating in the circumferential direction, thereby preventing the line 2 from becoming tangled and shortened, and further ensuring the accuracy of the total length of the measuring rod 1 and the line 2.

[0022] In this embodiment, the length measuring device is used to measure the total length of the fishing rod and line. The measuring groove 3 can be placed horizontally. A fishhook is tied to the front end of the line 1, and the fishhook is hooked onto one end of the measuring groove 3, which can fix the front end of the line 2. Depending on the actual needs, the measuring groove 3 can also be slightly tilted downward along the axial direction from the line 1 to the rod 2. The tilt angle is adjusted according to the elasticity and flexibility of the line 1 to ensure that the line 1 is properly taut. In actual use, the tilt angle of the measuring groove 3 should not exceed 5 degrees.

[0023] The periphery of the sliding sleeve 4 also includes mounting grooves 43, which have outward-facing openings 44. The number of mounting grooves 43 is the same as the number of balls 41, and the balls 41 are arranged sequentially in the mounting grooves 43 with their outer sides extending out of the openings 44.

[0024] The shape of the mounting groove 43 is adapted to the shape of the ball 41, allowing the outer side of the ball 41 to partially extend out of the periphery of the slide sleeve 4. This ensures that the ball 41 can roll smoothly while protecting the ball 41 and increasing the durability of the slide sleeve 4.

[0025] The ball bearing 41 is ellipsoidal and can fit well with the inner wall of the measuring groove 3, which can reduce the friction between the sliding sleeve 4 and the measuring groove 3 and ensure that the rod 1 can move more smoothly.

[0026] The sliding sleeve 4 also includes a first housing 45 and a second housing 46, which are fastened together and adopt a split structure, which facilitates product processing; the ball bearing 41 and the ball bearing shaft 42 are located between the first housing 45 and the second housing 46, which makes installation and operation convenient.

[0027] A positioning mechanism 47 is provided between the first housing 45 and the second housing 46. The positioning mechanism 47 is used to ensure that the relative position between the first housing 45 and the second housing 46 is accurate.

[0028] The positioning mechanism 47 includes an inner positioning sleeve 471 and an outer positioning sleeve 472. The outer positioning sleeve 472 is fitted over the inner positioning sleeve 471 and they fit together. The inner positioning sleeve 471 is fixedly located at the center of the first housing 45, and the outer positioning sleeve 472 is fixedly located at the center of the second housing 46. The inner diameter of the inner positioning sleeve 471 is adapted to the outer diameter of the rod 1. When the sliding sleeve 4 is fitted onto the rod 1, the outer side of the rod 1 abuts against the inner side of the inner positioning sleeve 471.

[0029] Multiple sliding sleeves 4 are provided and distributed along the axial direction of the rod 1, which can better support the rod 1 and prevent the rod 1 from tilting. In this embodiment, the rod 1 is a fishing rod, and the diameter of the rod 1 gradually decreases from back to front. The outer diameter of the sliding sleeve 4 can also be selected according to the change of the outer diameter of the rod 1, so as to better control the direction of the rod 1 and ensure that the axial centers of the rod 1 and the line 2 coincide. In this embodiment, two sliding sleeves 4 are installed on the rod 1. The number of sliding sleeves 4 is determined according to the length and shape of the rod 1.

[0030] The outermost sliding sleeve 4 is close to the rear end of rod 1, which can better control the direction of rod 1.

[0031] The sliding sleeve 4 is circular, and the measuring groove 3 is V-shaped, which can effectively limit the direction of the rod 1.

[0032] The inner wall of the measuring groove 3 is provided with a scale 31, which has a length scale along the axial direction of the measuring groove 3. The difference between the length scale of the rear end of the rod 2 and the length scale of the front end of the line 1 can be used to directly calculate the total length of the rod 2 and the line 1. Generally, the front end of the line 1 is fixed at the 0 mark to facilitate counting.

[0033] In this embodiment, the ball bearing shaft 42 is made of metal and the ball bearing 41 is made of plastic, resulting in low manufacturing cost and good performance.

[0034] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A length measuring device for measuring the total length of a rod and a line, comprising a measuring slot in which the rod and the line are arranged, the front end of the line being fixed, characterized in that, It also includes a sliding sleeve, which includes balls and ball shafts. The balls are rotatably mounted on the ball shafts. Multiple sets of balls and ball shafts are provided. The ball shafts are evenly distributed along the circumferential direction of the sliding sleeve, and the balls are sequentially distributed around the periphery of the sliding sleeve. The sliding sleeve is mounted on the rod and is linked to the rod.

2. The length measuring device of claim 1, wherein, The periphery of the sliding sleeve also includes mounting grooves, which have outward-facing openings; the number of mounting grooves is the same as the number of balls, and the balls are sequentially arranged in the mounting grooves with their outer sides extending out of the openings.

3. The length measuring device of claim 2, wherein, The ball bearings are ellipsoidal in shape.

4. The length measuring device according to any one of claims 1 to 3, characterized in that, The sliding sleeve also includes a first housing and a second housing, which are fastened together; the ball and the ball shaft are disposed between the first housing and the second housing.

5. The length measuring device of claim 4, wherein, A positioning mechanism is provided between the first housing and the second housing. The positioning mechanism includes a positioning inner sleeve and a positioning outer sleeve. The positioning outer sleeve is fitted over the positioning inner sleeve and fits together with it. The positioning inner sleeve is fixedly located at the center of the first housing, and the positioning outer sleeve is fixedly located at the center of the second housing.

6. The length measuring device according to any one of claims 1 to 3, characterized in that The sliding sleeves are provided in multiple portions and distributed along the axial direction of the rod.

7. The length measuring device of claim 6, wherein, The outermost sliding sleeve is close to the rear end of the rod.

8. The length measuring device according to any one of claims 1 to 3, characterized in that The sliding sleeve is annular, and the measuring groove is V-shaped.

9. The length measuring device according to any one of claims 1 to 3, characterized in that The inner wall of the measuring groove is provided with a scale, which has length markings along the axial direction of the measuring groove.

10. The length measuring device according to any one of claims 1 to 3, characterized in that The ball bearing shaft is made of metal, and the balls are made of plastic.

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