Distance measuring wheel convenient for interpretation

Abstract

The invention relates to a distance measuring wheel convenient for interpretation, which comprises a main body, a wheel body, a distance measuring assembly, an upper transmission group, a lower transmission group and a middle shaft assembly, the main body comprises a handle part and a wheel fork part, the wheel body is arranged on the wheel fork part, the distance measuring assembly is arranged on the handle part, the upper transmission group is connected with the distance measuring assembly and is provided with an upper connecting gear, and the lower transmission group is connected with the wheel body and is provided with a lower connecting gear. The middle shaft assembly comprises a middle shaft, an elastic piece, an upper joint piece and a lower joint piece, the middle shaft is connected with the upper joint piece and the lower joint piece to rotate synchronously, and the upper joint piece and the lower joint piece are meshed with the upper connecting gear and the lower connecting gear respectively. The elastic force of the elastic piece can push the upper joint piece and the lower joint piece to the upper connecting gear and the lower connecting gear respectively, so that the transmission stability is ensured, and a lower measurement error is maintained.

Description

Technical Field

[0001] The present invention relates to a distance measuring wheel, in particular to a distance measuring wheel which is easy to read. Background Art

[0002] A distance measuring wheel is a type of measuring equipment widely used on construction sites and roads. It generally consists of a wheel body and a distance measuring assembly. The distance measuring assembly is connected to the wheel body and can measure the distance the wheel body has rolled. For example, the distance measuring assembly can include a counter to record the number of rotations of the wheel body during rolling. The user can calculate the distance the wheel body has rolled by combining the recorded number of rotations with the diameter of the wheel body.

[0003] The distance measuring assembly of existing distance measuring wheels is typically located adjacent to the wheel body. This reduces the number of transmission mechanisms between the wheel body and the distance measuring assembly, resulting in a more stable transmission and lower measurement errors. However, since the distance measuring assembly is located adjacent to the bottom of the wheel body, operators need to squat to get closer to the distance measuring assembly when interpreting the displayed value, which is inconvenient. Summary of the Invention

[0004] In order to solve the problem of inconvenience in interpreting the value displayed by the distance measuring component in the existing distance measuring wheel, the purpose of the present invention is to provide a distance measuring wheel that is easy to interpret and can still maintain a low measurement error.

[0005] The present invention solves the technical problem and proposes a distance measuring wheel that is easy to read, which includes:

[0006] A main body comprising a handle portion and a fork portion positioned opposite to each other, and a middle tube assembly connecting the handle portion and the fork portion;

[0007] a wheel body rotatably mounted on the wheel fork;

[0008] a distance measuring component disposed on the handle; and

[0009] an upper transmission assembly disposed in the handle portion, connected to the distance measuring assembly, and comprising an upper connecting gear;

[0010] a lower transmission assembly disposed in the wheel fork, connected to the wheel body, and comprising a lower connecting gear;

[0011] A central shaft assembly is disposed in the central tube assembly and includes a central shaft, an upper engaging member, a lower engaging member, and an elastic member. The central shaft is connected to the upper engaging member and the lower engaging member and can rotate synchronously. The upper engaging member is engaged with the upper gear, and the lower engaging member is engaged with the lower gear. The elastic force of the elastic member can push the upper engaging member and the lower engaging member toward the upper gear and the lower gear, respectively.

[0012] The distance measuring wheel that is easy to read, wherein the upper engaging member includes a gear portion and a latch portion, the gear portion meshes with the upper gear, the latch portion is coaxially connected to the gear portion, and the latch portion is inserted into the central shaft and latched with the central shaft.

[0013] The distance measuring wheel that is easy to read, wherein the lower connecting member includes a gear portion and a latch portion, the gear portion is engaged with the lower connecting gear, the latch portion is coaxially connected to the gear portion, and the latch portion is inserted into the central shaft and latched with the inner wall of the central shaft.

[0014] The distance measuring wheel that is easy to read, wherein the middle tube group includes an upper tube body and a lower tube body, the upper tube body and the lower tube body can swing relative to each other to fold or unfold, and the middle axis includes two shaft tubes, the two shaft tubes are respectively arranged in the upper tube body and the lower tube body, and the two shaft tubes can be detachably combined to rotate synchronously.

[0015] The distance measuring wheel that is easy to read, wherein the central axis includes two shaft tube connectors, each of the shaft tube connectors includes a bite end and an insertion end, the insertion ends of the two shaft tube connectors are respectively inserted into the two shaft tubes and locked with the two shaft tubes, and the bite ends of the two shaft tube connectors bite.

[0016] In the distance measuring wheel that is easy to read, the elastic member is arranged between the central shaft and the upper joint member, and the elastic member can press against the central shaft, so that the central shaft pushes against the lower joint member.

[0017] The distance measuring wheel that is easy to read, wherein the upper transmission group includes multiple transmission gears, the multiple transmission gears are meshed in sequence, the upper connecting gear is meshed with one of the transmission gears, and a rotating shaft of the distance measuring component is combined with another transmission gear to rotate synchronously.

[0018] The distance measuring wheel that is easy to read, wherein the lower transmission group includes a wheel shaft member and a transmission shaft, the wheel shaft member is arranged at the axis center of the wheel body along the axial direction of the wheel body and can rotate synchronously with the wheel body, the transmission shaft is arranged along an axial direction of the central axis, the top and bottom ends of the transmission shaft are respectively engaged with the lower gear and the wheel shaft member, the axis center of the lower gear is arranged along the axial direction of the wheel body, and the axial direction of the central axis is perpendicular to the axial direction of the wheel body.

[0019] The technical means of the present invention can achieve the following benefits:

[0020] The easy-to-read distance measuring wheel of the present invention comprises the upper transmission group, the lower transmission group, and the central shaft assembly, and can transmit the rotation of the wheel body from the wheel fork portion to the handle portion, so that the distance measuring assembly can be arranged on the handle portion. Compared with the existing distance measuring wheels in which the distance measuring assembly is arranged adjacent to the wheel body, the distance measuring wheel of the present invention is easier to read, and the user can view the data displayed by the distance measuring assembly without squatting.

[0021] The elastic force of the elastic member can push the upper engaging member and the lower engaging member toward the upper connecting gear and the lower connecting gear, respectively, to avoid a gap between the meshing upper engaging member and the upper connecting gear (the lower engaging member and the lower connecting gear). Even if the transmission mechanism is elongated due to the distance measuring component being arranged on the handle, it can still transmit the power more accurately and maintain a low measurement error. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional appearance diagram of a preferred embodiment of the present invention.

[0023] Figure 2 It is a side sectional view of a preferred embodiment of the present invention.

[0024] Figure 3 It is a side cross-sectional view of the upper transmission group and the distance measuring component of the preferred embodiment of the present invention.

[0025] Figure 4 This is an exploded view of the handle portion of a preferred embodiment of the present invention.

[0026] Figure 5 This is an exploded view of the upper transmission group and the distance measuring component of a preferred embodiment of the present invention.

[0027] Figure 6 It is a side sectional view of the lower transmission group of a preferred embodiment of the present invention.

[0028] Figure 7 This is an exploded view of the components of the lower transmission group of a preferred embodiment of the present invention.

[0029] Figure 8 It is a partial side cross-sectional view of the central shaft assembly of a preferred embodiment of the present invention.

[0030] Figure 9 1 is an exploded view of the center shaft assembly according to a preferred embodiment of the present invention.

[0031] Figure 10 FIG1 is a partial side cross-sectional view of the central axis assembly of a preferred embodiment of the present invention when folded. DETAILED DESCRIPTION

[0032] In order to understand the technical features and practical effects of the present invention in detail and to realize the invention according to the new content, a preferred embodiment shown in the drawings is further described in detail as follows:

[0033] like Figure 1 and Figure 2As shown, a distance measuring wheel for easy reading according to a preferred embodiment of the present invention includes a main body 10, a wheel body 20, a distance measuring assembly 30, an upper transmission group 40, a lower transmission group 50 and a central shaft assembly 60. The wheel body 20 is disposed at the bottom of the main body 10, the distance measuring assembly 30 is disposed at the top of the main body 10, and the upper transmission group 40, the lower transmission group 50 and the central shaft assembly 60 are disposed within the main body 10 to transmit data between the wheel body 20 and the distance measuring assembly 30.

[0034] like Figure 1 and Figure 2 As shown, the main body 10 includes a handle portion 11, a wheel fork portion 12 and a middle tube group 13. The handle portion 11 and the wheel fork portion 12 are respectively located at the top and bottom of the main body 10 and are opposite to each other. The middle tube group 13 is connected between the handle portion 11 and the wheel fork portion 12. Figure 2 As shown, the wheel body 20 is disposed on the fork portion 12, and the distance measuring component 30 is disposed on the handle portion 11. Figure 3 and Figure 4 As shown, specifically, the handle portion 11 includes a shell 111 and an upper cover 112. The shell 111 is hollow to accommodate the distance measuring component 30 and the corresponding transmission mechanism. The outer periphery of the shell 111 is connected to a handle body 113 for the user to hold, and the upper cover 112 covers an opening on the shell 111 that is connected to the interior.

[0035] like Figure 1 and Figure 2 As shown, the wheel body 20 is rotatably mounted on the fork portion 12. During use, the distance measuring wheel contacts the ground with the wheel body 20. The user grips the handle body 113 of the handle portion 11 and applies force to push the distance measuring wheel, causing the wheel body 20 to rotate and move its outer periphery along the ground. The upper transmission group 40, the lower transmission group 50, and the central shaft assembly 60 are disposed between the wheel body 20 and the distance measuring assembly 30, and can transmit power between the wheel body 20 and the distance measuring assembly 30, allowing the user to obtain the distance the outer periphery of the wheel body 20 moves along the ground through the distance measuring assembly 30. The structures of the upper transmission group 40, the lower transmission group 50, and the central shaft assembly 60 are described below.

[0036] like Figure 2 、 Figure 3 and Figure 6As shown, the upper transmission group 40 is arranged in the handle portion 11 and is connected to the distance measuring assembly 30. The lower transmission group 50 is arranged in the fork portion 12 and is connected to the wheel body 20. The middle shaft assembly 60 is arranged in the middle tube group 13 and is located between the upper transmission group 40 and the lower transmission group 50. The middle shaft assembly 60 can rotate in the middle tube group 13 and transmit power between the upper transmission group 40 and the lower transmission group 50. The middle shaft assembly 60 includes a middle shaft 61, an upper coupling 41 and a lower coupling 51. The middle shaft 61 is connected to the upper coupling 41 and the lower coupling 51 and can rotate synchronously, and is connected to the upper transmission group 40 and the lower transmission group 50 through the upper coupling 41 and the lower coupling 51.

[0037] like Figures 3 to 5 As shown, the upper transmission group 40 includes an upper connecting gear 42, and the upper connecting member 41 is engaged with the upper connecting gear 42, whereby, when the upper connecting member 41 and the central shaft 61 rotate synchronously, the upper connecting gear 42 can be driven to rotate, thereby transmitting the rotation of the central shaft 61 to the upper transmission group 40; specifically, the upper connecting member 41 is arranged along the axial direction A1 of the central shaft 61, and the axis of the upper connecting gear 42 is arranged along a setting direction D, and the axial direction A1 is perpendicular to the setting direction D. The upper connecting member 41 includes a gear portion 411 and a latch portion 412, and the upper connecting member 41 is engaged with the upper connecting gear 42 through the gear portion 411. The latch portion 412 is coaxially connected to the gear portion 411 and has elasticity. The latch portion 412 is inserted into the central shaft 61 and, due to its elasticity, abuts against the inner wall of the central shaft 61, thereby latching with the central shaft 61.

[0038] like Figures 3 to 5 As shown, in a preferred embodiment of the present invention, the upper transmission group 40 is provided with a plurality of transmission gears 43 between the upper connecting gear 42 and the distance measuring component 30. The plurality of transmission gears 43 are meshed with each other in sequence, wherein one of the transmission gears 43 is meshed with the upper connecting gear 42, and another transmission gear 43 is combined with a connecting shaft 31 protruding from the outside of the distance measuring component 30 and can rotate synchronously, so that the rotation of the upper connecting gear 42 can be transmitted to the connecting shaft 31 of the distance measuring component 30.

[0039] In other embodiments, the upper transmission group 40 may also include a single transmission gear 43, which is directly meshed with the upper connecting gear 42 and combined with the connecting shaft 31, or the upper connecting gear 42 may be directly combined with the connecting shaft 31, both of which can achieve the transmission effect. The multiple transmission gears 43 in the preferred embodiment of the present invention enable the sizes of the transmission gear 43 and the upper connecting gear 42 to be designed to be smaller, which can be compactly configured and save space, and the volume of the handle portion 11 can also be designed to be smaller.

[0040] like Figure 6 and Figure 7 As shown, the lower transmission assembly 50 includes a lower connecting gear 52, which is engaged with the lower connecting gear 52 and the lower connecting member 51 of the middle shaft assembly 60. Thereby, the lower connecting member 51 can be driven by the lower connecting gear 52 to rotate, and the middle shaft 61 rotates synchronously with the lower connecting member 51, and the rotation of the lower connecting gear 52 is transmitted to the middle shaft 61. Specifically, the structure of the lower connecting member 51 is similar to that of the upper connecting member 41, and it includes a gear portion 511 and a latch portion 512. The lower connecting member 51 is rotated along the lower connecting gear 52. The central shaft 61 is arranged in the axial direction A1, and the axis of the lower gear 52 is arranged along the axial direction A2 of the wheel body 20, and the axial direction A1 of the central shaft 61 is perpendicular to the axial direction A2 of the wheel body 20. The lower coupling member 51 is engaged with the lower gear 52 through the gear portion 511. The latch portion 512 is coaxially connected to the gear portion 511 and has elasticity. The latch portion 512 is inserted into the central shaft 61 and, due to its elasticity, abuts against the inner wall of the central shaft 61, thereby latching with the central shaft 61.

[0041] like Figure 6 and Figure 7 As shown, in a preferred embodiment of the present invention, the lower transmission group 50 further includes a wheel shaft member 53 and a transmission shaft 54. The wheel shaft member 53 is arranged at the axis of the wheel body 20 along the axial direction A2 of the wheel body 20 and rotates synchronously with the wheel body 20. The lower connecting gear 52 is also arranged along the axial direction A2 of the wheel body 20 and is parallel to the wheel shaft member 53. The transmission shaft 54 ​​is arranged along the axial direction A1 of the central axis 61. The bottom end of the transmission shaft 54 ​​is engaged with the wheel shaft member 53, and the top end of the transmission shaft 54 ​​is engaged with the lower connecting gear 52. When the wheel body 20 rotates, the wheel shaft member 53 rotates synchronously and drives the transmission shaft 54 ​​and the lower connecting gear 52 to rotate in sequence, and finally transmits the rotation to the central axis 61 through the lower connecting member 51.

[0042] like Figure 7 As shown, specifically, the transmission shaft 54 ​​includes a transmission shaft tube 541 and two couplings 542. The structure of the two couplings 542 and the transmission shaft tube 541 is similar to the structure of the upper coupling 41, the lower coupling 51 and the middle shaft 61. The two couplings 542 can respectively engage with the lower gear 52 and the wheel shaft 53, and are inserted into the transmission shaft tube 541 and locked with the transmission shaft tube 541, so that the rotation of the wheel shaft 53 can be transmitted to the lower gear 52; in other embodiments, the lower transmission group 50 can also use multiple gears to transmit between the lower gear 52 and the wheel shaft 53, and is not limited to the preferred embodiment of the present invention.

[0043] During use, the distance measuring wheel is pushed, causing the wheel body 20 to rotate and move along the ground with its outer periphery. Through the sequential transmission of the lower transmission assembly 50, the middle shaft assembly 60, and the upper transmission assembly 40, the rotation of the wheel body 20 is transmitted from the fork portion 12 from bottom to top to the distance measuring assembly 30 located on the handle portion 11, allowing the distance measuring assembly 30 to obtain data on the movement of the wheel body 20. In this way, the user can directly observe the distance measuring assembly 30 located on the handle portion 11 and obtain data on the movement of the wheel body 20 along the ground.

[0044] Specifically, the distance measuring assembly 30 may include a control unit, which stores a conversion formula for the transmission between the upper transmission group 40, the lower transmission group 50, and the middle shaft assembly 60 (for example, the diameter ratio of the wheel shaft 53 to the wheel body 20, the gear ratio of the gear portion 511 to the lower connecting gear 52, the gear ratio of the upper connecting member 41 to the gear portion 411, etc.), so that the control unit can calculate the distance the wheel body 20 moves along the ground by rotating the connecting shaft 31 and display it on a screen of the distance measuring assembly 30. Alternatively, the dimensions of the gears and other structures in the upper transmission assembly 40, the lower transmission assembly 50, and the middle shaft assembly 60 can be specifically designed so that the number of revolutions of the connecting shaft 31 and the wheel body 20 are consistent, and the distance measuring assembly 30 can include a revolution counter, which is used to obtain the number of revolutions of the connecting shaft 31 (i.e., the number of revolutions of the wheel body 20), and then combined with the diameter of the wheel body 20 to calculate the distance the wheel body 20 moves along the ground. The form of the distance measuring assembly 30 is not specifically limited in the preferred embodiment of the present invention.

[0045] like Figure 3 and Figure 6 As shown, the middle shaft assembly 60 further includes an elastic member 62. The elastic force of the elastic member 62 can push the upper engaging member 41 and the lower engaging member 51 toward the upper connecting gear 42 and the lower connecting gear 52 respectively. In a preferred embodiment of the present invention, the elastic member 62 is a compression spring, which is disposed between the middle shaft 61 and the upper engaging member 41, and the two ends of the elastic member 62 respectively abut against the top end of the middle shaft 61 and the gear portion 411 of the upper engaging member 41. Figure 3 As shown, the gear portion 411 can be pushed upward toward the upper gear 42 by the elastic member 62, so that the gear portion 411 and the upper gear 42 are stably engaged. Figure 3 and Figure 6 As shown, the central shaft 61 can be pushed downward by the elastic member 62 , thereby pressing against the gear portion 511 and elastically pushing the gear portion 511 toward the lower gear 52 , so that the gear portion 511 and the lower gear 52 are stably engaged.

[0046] In a preferred embodiment of the present invention, the elastic member 62 is in the form of a compression spring to provide elastic force. In other embodiments, the elastic member 62 can also be a disc spring, a spring sheet, or a structure made of elastic materials such as rubber. As long as the elastic member 62 can provide elastic force to push the upper coupling member 41 and the lower coupling member 51 toward the upper gear 42 and the lower gear 52 respectively, so that the upper coupling member 41 and the lower coupling member 51 can stably engage with the upper gear 42 and the lower gear 52 respectively, the specific form of the elastic member 62 is not limited to the preferred embodiment of the present invention.

[0047] In addition, in a preferred embodiment of the present invention, the elastic member 62 is arranged between the central shaft 61 and the upper coupling member 41, and its two ends respectively press against the top end of the central shaft 61 and the gear portion 411 of the upper coupling member 41. In other embodiments, the elastic member 62 can also be arranged between the central shaft 61 and the lower coupling member 51 to directly push against the lower coupling member 51 and drive the central shaft 61 to push against the upper coupling member 41. Alternatively, the elastic member 62 can also be arranged in the middle section of the central shaft 61. As long as the elastic force of the elastic member 62 can push the upper coupling member 41 toward the upper gear 42 and push the lower coupling member 51 toward the lower gear 52, the effect of improving transmission accuracy and maintaining a low measurement error can be achieved. The setting position of the elastic member 62 is not limited to the preferred embodiment of the present invention.

[0048] The present invention provides a distance measuring wheel that is easy to read, including an upper transmission assembly 40, a lower transmission assembly 50, and a central shaft assembly 60. The wheel fork 12 transmits the rotation of the wheel body 20 to the handle 11, allowing the distance measuring assembly 30 to be positioned on the handle 11. Compared to conventional distance measuring wheels in which the distance measuring assembly is positioned adjacent to the wheel body, the present invention allows a user to view the data displayed by the distance measuring assembly 30 without having to squat. Furthermore, the elastic force of the elastic member 62 pushes the upper and lower engaging members 41 and 51 toward the upper and lower gears 42 and 52, respectively, thereby preventing a gap from forming between the meshed upper and lower engaging members 41 and 42 (the lower and lower engaging members 51 and 52). Even if the transmission mechanism is elongated due to the positioning of the distance measuring assembly 30 on the handle 11, accurate transmission is still achieved. This provides a distance measuring wheel that is easy to read and maintains low measurement errors.

[0049] like Figure 8 and Figure 10 As shown, further, in a preferred embodiment of the present invention, the middle tube group 13 includes an upper tube body 131 and a lower tube body 132, and the upper tube body 131 and the lower tube body 132 are connected by a pivot assembly 14, so that the upper tube body 131 and the lower tube body 132 can swing relative to each other and fold or unfold, as shown in FIG. Figures 8 to 10As shown, the central shaft 61 includes two shaft tubes 611A and 611B. The two shaft tubes 611A and 611B are respectively disposed in the upper tube 131 and the lower tube 132. The two shaft tubes 611A and 611B can be separated and coupled to each other for synchronous rotation. When the upper tube 131 and the lower tube 132 are deployed, the two shaft tubes 611A and 611B are coupled and rotate synchronously, allowing the central shaft 61 to operate normally. When the upper tube 131 and the lower tube 132 are folded, the two shaft tubes 611A and 611B separate and swing with the upper tube 131 and the lower tube 132, respectively. In this way, the distance measuring wheel can be folded to reduce the space occupied by the wheel for storage.

[0050] like Figures 8 to 10 As shown, specifically, the central axis 61 also includes two shaft tube connectors 612, each of the shaft tube connectors 612 includes a bite end 613 and an insertion end 614, the bite end 613 is provided with a plurality of bite teeth arranged around, the insertion end 614 is connected to the bite end 613, the insertion ends 614 of the two shaft tube connectors 612 are respectively inserted into the two shaft tubes 611A and 611B and engaged with the two shaft tubes 611A and 611B, and the bite ends 613 of the two shaft tube connectors 612 are engaged with each other. When the upper tube body 131 and the lower tube body 132 are folded, the bite ends 613 of the two shaft tube connectors 612 can directly detach from each other as the upper tube body 131 and the lower tube body 132 swing relative to each other.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any person with ordinary knowledge in the technical field can make equivalent embodiments by making partial changes or modifications to the technical content disclosed in the present invention without departing from the scope of the technical solution of the present invention, and the equivalent embodiments still fall within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A distance measuring wheel that is easy to read, characterized in that: Include: A main body comprising a handle portion and a fork portion positioned opposite to each other, and a middle tube assembly connecting the handle portion and the fork portion; a wheel body rotatably mounted on the wheel fork; a distance measuring component disposed on the handle; and an upper transmission assembly disposed in the handle portion, connected to the distance measuring assembly, and comprising an upper connecting gear; a lower transmission assembly disposed in the wheel fork, connected to the wheel body, and comprising a lower connecting gear; A central shaft assembly is disposed in the central tube assembly and includes a central shaft, an upper engaging member, a lower engaging member, and an elastic member. The central shaft is connected to the upper engaging member and the lower engaging member and can rotate synchronously. The upper engaging member is engaged with the upper gear, and the lower engaging member is engaged with the lower gear. The elastic force of the elastic member can push the upper engaging member and the lower engaging member toward the upper gear and the lower gear, respectively.

2. The distance measuring wheel for easy reading according to claim 1, characterized in that: The upper connecting member includes a gear portion and a latch portion. The gear portion is meshed with the upper connecting gear. The latch portion is coaxially connected to the gear portion. The latch portion is inserted into the central shaft and latched with the central shaft.

3. The distance measuring wheel for easy reading according to claim 1, characterized in that: The lower connecting member includes a gear portion and a latch portion, the gear portion is meshed with the lower connecting gear, the latch portion is coaxially connected to the gear portion, and the latch portion is inserted into the central shaft and latched with the inner wall of the central shaft.

4. The distance measuring wheel for easy reading according to any one of claims 1 to 3, characterized in that: The middle tube group includes an upper tube body and a lower tube body, and the upper tube body and the lower tube body can swing relative to each other to fold or unfold. The middle axis includes two axial tubes, and the two axial tubes are respectively arranged in the upper tube body and the lower tube body. The two axial tubes can be detachably combined and can rotate synchronously.

5. The distance measuring wheel for easy reading according to claim 4, characterized in that: The central axis includes two shaft tube connectors, each of which includes a bite end and an insertion end. The insertion ends of the two shaft tube connectors are respectively inserted into the two shaft tubes and locked with the two shaft tubes, and the bite ends of the two shaft tube connectors bite.

6. The distance measuring wheel for easy reading according to any one of claims 1 to 3, characterized in that: The elastic member is arranged between the central axis and the upper connecting member. The elastic member can press against the central axis, so that the central axis pushes against the lower connecting member.

7. The distance measuring wheel for easy reading according to any one of claims 1 to 3, characterized in that: The upper transmission group includes a plurality of transmission gears, which are meshed with each other in sequence. The upper connecting gear is meshed with one of the transmission gears. A rotating shaft of the distance measuring component is combined with another transmission gear to rotate synchronously.

8. The distance measuring wheel for facilitating reading according to any one of claims 1 to 3, characterized in that: The lower transmission group includes a wheel shaft and a transmission shaft. The wheel shaft is arranged at the axis center of the wheel body along the axial direction of the wheel body and can rotate synchronously with the wheel body. The transmission shaft is arranged along an axial direction of the middle shaft. The top and bottom ends of the transmission shaft are respectively engaged with the lower gear and the wheel shaft. The axis center of the lower gear is arranged along the axial direction of the wheel body, and the axial direction of the middle shaft is perpendicular to the axial direction of the wheel body.

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