A measuring wheel

Abstract

The utility model provides a distance measuring wheel, including a connecting rod, a roller is arranged at the lower end of the connecting rod, a brake arm is hinged on the connecting rod through a torsion spring, the brake arm is two and respectively arranged on both sides of the roller, so that when the brake arm abuts against or moves away from the roller, the roller can be locked or unlocked, a slider is slidably arranged on the connecting rod, and a blocking piece is arranged on the slider, and the blocking piece is distributed on both sides of the roller, so that the blocking piece can rise or fall with the slider, abut against or move away from the ground. By arranging the brake arm and the blocking piece, the distance measuring wheel can increase the measurement accuracy by preventing the roller from rolling, and can also support the ground through the blocking piece to prevent the entire device from moving relative to the target location, thereby further increasing the measurement accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of garden planning, in particular to a distance measuring wheel. Background Art

[0002] The distance measuring wheel is also called a mechanical distance measuring vehicle and is widely used in professional surveying and mapping operations. As a college teacher, the inventor found that in actual operation, the existing distance measuring wheel does not have a brake design when teaching students. Therefore, when students move the distance measuring wheel to the target position and intend to stop the movement, the distance measuring wheel often continues to roll or slide, etc. Unexpected movement problems occur, resulting in large deviations in the measurement results or the need to re-measure, which is time-consuming and laborious. Therefore, a distance measuring wheel is proposed to solve the above problems. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a distance measuring wheel which has the advantage of being easy to use.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a distance measuring wheel, comprising a connecting rod, a roller is arranged at the lower end of the connecting rod, a brake arm is hinged on the connecting rod through a torsion spring, the brake arms are two and are respectively arranged on both sides of the roller, so that when the brake arms abut against or move away from the roller, the roller can be locked or unlocked, a slider is slidably provided on the connecting rod, and a blocking member is provided on the slider, and the blocking members are distributed on both sides of the roller, so that the blocking member can rise or fall with the slider, abut against or move away from the ground.

[0005] Furthermore, a handle is provided at the upper end of the connecting rod, a button is provided at the lower end of the handle, a pull rope 2 is connected between the button and the blocking member, and a pull rope 1 is connected between the button and the brake arm.

[0006] Furthermore, a through hole is provided on the blocking member, and the pull rope passes through the through hole and is connected to the brake arm.

[0007] Furthermore, the lower end of the connecting rod is provided with an extension portion extending to the left and right sides, and a spring is connected between the lower end surface of the slider and the extension portion, so that after the button is retracted into the handle, the spring is in a stretched state under the pulling of the second pull rope.

[0008] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0009] 1. The distance measuring wheel is provided with a brake arm and a blocking member, so that the device can not only increase the measurement accuracy by preventing the roller from rolling, but also support the ground through the blocking member to prevent the whole device from moving relative to the target location, thereby further increasing the measurement accuracy.

[0010] 2. The distance measuring wheel is provided with a pull rope to connect two parts for blocking movement, so that when the button is pressed or released, the two parts can be driven at the same time, so that the device has a simple structure, low cost and is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the appearance of the utility model;

[0012] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0013] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0014] Figure 4 It is a partial structural schematic diagram of the utility model.

[0015] In the figure: 1. connecting rod; 11. handle; 12. roller; 13. button; 2. brake arm; 21. pull rope 1; 3. slider; 31. block; 32. pull rope 2; 33. spring. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0017] See also Figure 1-4 A distance measuring wheel in the present application includes a connecting rod 1, a roller 12 is arranged at the lower end of the connecting rod 1, a brake arm 2 is hinged on the connecting rod 1 through a torsion spring, and there are two brake arms 2, which are respectively arranged on both sides of the roller 12, so that when the brake arm 2 abuts against or moves away from the roller 12, the roller 12 can be locked or unlocked, a slider 3 is slidably provided on the connecting rod 1, and a blocking member 31 is provided on the slider 3. The blocking member 31 is distributed on both sides of the roller 12, so that the blocking member 31 can rise or fall with the slider 3, abut against or move away from the ground.

[0018] The device is provided with a brake arm 2 and a blocking member 31, so that under the action of a torsion spring and gravity, the two components can respectively abut against the roller 12 and the ground to play a blocking role, so that the device can prevent the roller 12 from rolling, thereby avoiding the problem of the distance measuring wheel continuing to roll when the measurement is to be stopped, thereby increasing the measurement accuracy, and can also support the ground through the blocking member 31, thereby avoiding the problem of relative sliding between the locked roller 12 and the ground when the measurement is to be stopped, thereby further increasing the measurement accuracy.

[0019] Furthermore, a handle 11 is provided at the upper end of the connecting rod 1 , a button 13 is provided at the lower end of the handle 11 , a pull rope 2 32 is connected between the button 13 and the blocking member 31 , and a pull rope 1 21 is connected between the button 13 and the brake arm 2 .

[0020] The design of the driving blocking member 31 and the brake arm 2 can adopt a variety of embodiments. The present application provides a preferred embodiment, in which the brake arm 2 is hinged to the extension of the connecting rod 1 by a torsion spring, and the blocking member 31 is slidably set on the connecting rod 1, so that the two components for blocking can spontaneously lock the pulley and the device as a whole without the action of external force, and the button 13 can be stored in the handle 11 by pressing, and the spring 33 is reset by the action of the elastic member in the handle 11 when there is no external force pressing, and the pull rope 21 is fixed to the brake arm 2 in an eight-shaped shape, so that the brake arm 2 is gradually rotated to a horizontal state when pulled by the pull rope 21, thereby separating the part abutting against the roller 12 from the roller 12, and when the button 13 is pressed, the blocking member 31 is directly pulled up by the pull rope 2 32, and no longer touches the ground, thereby realizing locking and unlocking. The above embodiment has a simple structure and is quick to operate, and two components for blocking can be operated simultaneously by operating one driving component, which is convenient to operate.

[0021] Furthermore, a through hole is formed on the blocking member 31 , and the pull rope 21 passes through the through hole and is connected to the brake arm 2 .

[0022] In order to comply with the user's usage habits, the handle 11 and the block 31 are usually designed to be placed in the same vertical plane. Since the device drives the block 31 and the brake arm 2 by driving the pull rope, the pull rope connected to the brake arm 2 needs to pass through the block 31. Without special design, the pull rope will overlap with the block 31, which will cause a lot of wear during repeated driving, resulting in a shortened service life of the components. Therefore, the device sets a through hole to allow the pull rope 21 to pass through without contacting the block 31, thereby ensuring the service life of the component.

[0023] Furthermore, the lower end of the connecting rod 1 is provided with an extension portion extending to the left and right sides, and a spring 33 is connected between the lower end surface of the slider 3 and the extension portion, so that after the button 13 is received in the handle 11, the spring 33 is in a stretched state under the pulling of the pull rope 32.

[0024] The device pulls the blocking member 31 downward by setting a shorter spring 33, so that when the pull rope is not acted upon by external force, the traction force plus the gravity causes the blocking member 31 to always support the ground, thereby increasing the blocking effect and preventing the device from accidentally moving relative to the ground. Different blocking members 31 can be used when measuring different ground materials. For example, when measuring a soft soil road surface, a pin can be used to touch the ground, while a suction cup can be used to touch the ground on a smooth road surface, and a friction block can be used to touch the ground on a cement road surface.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distance measuring wheel, comprising a connecting rod (1), wherein a roller (12) is arranged at the lower end of the connecting rod (1), characterized in that: A brake arm (2) is hingedly connected to the connecting rod (1) via a torsion spring. The brake arms (2) are two and are respectively arranged on both sides of the roller (12), so that when the brake arms (2) abut against or move away from the roller (12), the roller (12) can be locked or unlocked. A slider (3) is slidably provided on the connecting rod (1), and a blocking member (31) is provided on the slider (3). The blocking members (31) are distributed on both sides of the roller (12), so that the blocking member (31) can rise or fall with the slider (3) and abut against or move away from the ground.

2. A distance measuring wheel according to claim 1, characterized in that: The upper end of the connecting rod (1) is provided with a handle (11), the lower end of the handle (11) is provided with a button (13), a pull rope 2 (32) is connected between the button (13) and the blocking member (31), and a pull rope 1 (21) is connected between the button (13) and the brake arm (2).

3. A distance measuring wheel according to claim 2, characterized in that: The blocking member (31) is provided with a through hole, and the pull rope 1 (21) passes through the through hole and is connected to the brake arm (2).

4. A distance measuring wheel according to claim 2 or 3, characterized in that: The lower end of the connecting rod (1) is provided with an extension portion extending to the left and right sides, and a spring (33) is connected between the lower end surface of the slider (3) and the extension portion, so that after the button (13) is received in the handle (11), the spring (33) is in a stretched state under the pulling of the second pull rope (32).

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