Foldable wheel type range finder

Abstract

A foldable wheel type range finder comprises an idler wheel, a supporting rod and a handle, a counter is installed on the side face of the idler wheel, the supporting rod is divided into two foldable sections or three foldable sections, the upper supporting rod and the lower supporting rod which are adjacent are connected through a folding mechanism, and the folding mechanism comprises an upper connecting base fixedly arranged at the lower end of the upper supporting rod and a lower connecting base fixedly arranged at the upper end of the lower supporting rod. A left arc-shaped upper connecting lug and a right arc-shaped upper connecting lug are formed on the front side of the lower end of the upper connecting base, a left lower connecting lug and a right lower connecting lug which are in butt joint with the upper connecting lugs are formed on the front side of the upper end of the lower connecting base, and the upper connecting base and the lower connecting base are connected in a 180-degree rotating mode through a shaft pin penetrating through the upper connecting lugs and the lower connecting lugs. And a safety lock catch locked with the lower connecting seat is mounted on the rear side of the upper connecting seat. The folding mechanism is reasonable in structure, compared with the prior art, the folding mechanism is more convenient and faster to operate, and due to the fact that the safety lock catch is additionally arranged, connection is more stable and reliable, and the folding mechanism is smaller in size and convenient to carry and store after being folded.

Description

Technical Field

[0001] The utility model belongs to the technical field of distance measuring instruments and relates to a wheeled distance measuring instrument, in particular to a foldable wheeled distance measuring instrument. Background Art

[0002] Wheeled distance meters are a type of distance meter designed primarily for outdoor distance measurement and are suitable for use on a variety of surfaces, including grasslands, hillsides, and rugged construction sites. Due to their long measurement range and clear, accurate digital display, wheeled distance meters are widely used for measuring and assessing construction projects such as road construction, pipeline laying, and professional surveying and mapping, as well as for measuring the distance and location of traffic accidents, surveying golf courses, and managing farmland. Their time-saving and convenient advantages are increasingly being discovered and utilized. However, traditional wheeled distance meters are not foldable, occupying a large volume and making them inconvenient to carry and store. To address this, foldable wheeled distance meters have emerged.

[0003] Upon investigation, the existing Chinese patent number CN201120036854.7, "A Foldable Wheeled Distance Meter," includes a handle, a bracket, a travel wheel, and a counter. The handle is located on the upper portion of the bracket, while the travel wheel and counter are located on the lower portion of the bracket. The patent is characterized in that the bracket includes a ferrule, a connecting piece, an upper folding rod, and a lower folding rod. The lower end of the upper folding rod and the upper end of the lower folding rod are both hinged to the connecting piece. The inner diameter of the ferrule matches that of the upper and lower folding rods so that it can be fitted over the upper or lower folding rod, and the ferrule can move up and down to fit over the connecting piece. This wheeled distance meter is foldable, but it is secured by enclosing the connecting piece with the ferrule. The connection is not stable and reliable, and the operation is relatively cumbersome. Although the folded volume is small, it is still not ideal. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a foldable wheeled distance meter with reasonable structure, convenient and quick operation, and stable and reliable connection in response to the above technical status quo.

[0005] The foldable wheeled rangefinder of the present invention solves the above-mentioned technical problems. The technical solution adopted by the utility model is: a foldable wheeled rangefinder, comprising a wheel frame, a roller, a support rod and a handle, the roller being mounted on the wheel frame, a counter cooperating with the roller in the wheel frame, and a support rod and a handle thereof being provided on the wheel frame, characterized in that: the support rod is divided into two or three foldable sections, and the adjacent upper and lower support rods are connected by a folding mechanism. The folding mechanism comprises an upper connecting seat fixedly arranged at the lower end of the upper support rod and a lower connecting seat at the upper end of the lower support rod, the lower end front side of the upper connecting seat is formed with two arc-shaped upper connecting ears on the left and right, and the upper end front side of the lower connecting seat is formed with two lower connecting ears docked with the upper connecting ears, the upper connecting seat and the lower connecting seat are rotatably connected by an axle pin passing through the upper connecting ear and the lower connecting ear, and a safety lock buckle locked with the lower connecting seat is installed on the rear side of the upper connecting seat.

[0006] As an improvement, a semicircular protrusion is formed on the inner side of the right upper connecting ear of the upper connecting seat, and a semicircular right joint is provided on the right side of the lower end of the upper connecting seat to be positioned and docked with the semicircular protrusion. A semicircular protrusion is formed on the inner side of the left lower connecting ear of the lower connecting seat, and a semicircular left joint is provided on the left side of the upper end of the lower connecting seat to be positioned and docked with the semicircular protrusion.

[0007] Furthermore, the left joint is a semicircular structure with an opening facing downward, and an L-shaped connecting piece is formed at the rear end of the left joint, which is fixed to the upper end of the lower connecting seat by screws; the right joint is a semicircular structure with an opening facing upward, and an L-shaped connecting block is formed at the rear end of the right joint, which is fixed to the lower end of the upper connecting seat by screws; a positioning hole is provided on the lower end surface of the semicircular protrusion of the upper connecting seat, and a corresponding positioning column is embossed on the inner wall of the semicircular structure of the right joint, and the semicircular protrusion and the right joint are positioned to form a circular structure through the positioning hole and the positioning column; a positioning concave hole is provided on the upper end surface of the semicircular protrusion of the lower connecting seat, and a corresponding positioning convex column is embossed on the inner wall of the semicircular structure of the left joint, and the semicircular protrusion and the left joint are positioned to form a circular structure through the cooperation of the positioning concave hole and the positioning convex column.

[0008] Furthermore, the upper connecting seat and the lower connecting seat are respectively longitudinally formed with through holes for the lower support rod and the upper support rod to pass through. The upper connecting seat and the lower connecting seat are respectively sleeved on the lower end of the upper support rod and the upper end of the lower support rod and fixed by screws. A limiting notch is opened on the front side of the upper end of the lower support rod to facilitate the rotation of the upper connecting ear and the lower connecting ear.

[0009] Furthermore, the rear end of the upper connecting seat is longitudinally penetrated by a recessed installation groove for installing the safety lock buckle. The safety lock buckle includes a fixing plate and a lock buckle. The fixing plate is fixed to the upper position in the installation groove by screws. The middle part of the inner wall of the lock buckle is hinged to the lower end of the fixing plate by a fixing pin. A boss is provided at the rear end of the upper end of the lower connecting seat. The rear end surface of the boss is recessed with a card slot that cooperates with the lock buckle. A spring is supported between the upper end of the lock buckle and the fixing plate, so that the lock buckle has a tendency to always be locked with the card slot.

[0010] Furthermore, the rear part of the upper end surface of the lower connecting seat is provided with a concave cavity for the boss to be placed in, and the concave cavity is connected to the mounting groove. After the upper connecting seat and the lower connecting seat are aligned, the slot on the rear end surface of the boss just falls in the mounting groove near the bottom position, and the lock buckle is a strip corresponding to the mounting groove. The upper part of the lock buckle is a hand-pressing part inclined outward, and the inner lower end of the lock buckle is bent inward to form a lock buckle part. Lugs with axial holes are provided on the left and right sides of the middle part of the lock buckle, and fixing pins are provided on the left and right sides of the lower end of the fixing plate to cooperate with the axial holes of the lugs. Arc grooves for the lugs to be placed and rotated are recessed on the left and right sides of the middle part of the mounting groove, and a spring column is convexly provided on the middle of the front end surface of the fixing plate. The spring sleeve is provided on the spring column and supports the upper part of the lock buckle.

[0011] Furthermore, a foldable support frame is installed on one side of the wheel frame, and a handle is installed on the top of the support rod.

[0012] Furthermore, the support rod is divided into three sections: upper, middle and lower. The length of the middle section support rod is greater than that of the upper section support rod and greater than that of the lower section support rod. The folding mechanism is divided into two groups. The rotation direction of the folding mechanism of the lower group is to rotate back and forth close to the roller, and the rotation direction of the folding mechanism of the upper group is to rotate toward the side away from the roller.

[0013] Furthermore, the side of the wheel frame is provided with a fixed shaft, and the roller is detachably mounted on the fixed shaft and is fixed by a knob.

[0014] Finally, the main body of the handle is fixed by fitting left and right shells, a display screen and buttons are installed on the top, a USB charging port is provided at the tail, and a control circuit board and a rechargeable battery are installed in the middle cavity.

[0015] Compared with the prior art, the advantages of the present invention are: the folding mechanism includes upper and lower connecting bases, which are rotatably connected by an axle pin, and the upper and lower connecting bases are respectively provided with joints to form a circular structure, making the structure more stable and firm, and rotating more smoothly; the addition of a safety lock makes the connection reliable, preventing the support rod from collapsing due to collisions during use; it is easy to operate, and can be easily folded after pressing the safety lock to unlock it, and it can be folded in three sections, resulting in a smaller volume after folding. The present invention has a reasonable structure, and the folding mechanism is more convenient and quicker to operate than the prior art. Moreover, due to the addition of the safety lock, the connection is also more stable and reliable, and the volume after folding is smaller, making it easy to carry and store. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 Partial exploded view of

[0018] Figure 3 A partial exploded view from another angle of an embodiment of the present invention;

[0019] Figure 4 This is an exploded view of the folding mechanism of an embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the structure of an embodiment of the utility model in a folded state;

[0021] Figure 6 This is a structural schematic diagram of another angle of the embodiment of the utility model in the folded state.

[0022] Figure 7 It is a partial cross-sectional and exploded schematic diagram of the structure of an embodiment of the present utility model. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 7 As shown, a foldable wheeled rangefinder includes a wheel frame 9, a roller 1, a support rod 2 and a handle 3. The roller 1 is mounted on the wheel frame 9. The wheel frame 9 has a counter 7 that cooperates with the roller 1. The wheel frame 9 is provided with a support rod 2 and its handle 3. A support frame 6 is installed on the other side of the wheel frame 9. The support rod 2 is divided into two or three foldable sections. The adjacent upper and lower support rods are connected by a folding mechanism 4. The support rod 2 of this embodiment is divided into three sections 21, 22 and 23, and the folding mechanism 4 is two groups. The folding mechanism 4 between the upper support rod 21 and the middle support rod 22 is specifically described below.

[0025] The folding mechanism 4 includes an upper connecting seat 41 fixedly arranged at the lower end of the upper support rod 21 and a lower connecting seat 42 at the upper end of the middle support rod 22. The front side of the lower end of the upper connecting seat 41 is formed with two arc-shaped upper connecting ears 411 on the left and right, and the front side of the upper end of the lower connecting seat 42 is formed with two lower connecting ears 421 on the left and right that are connected to the upper connecting ears 411. The upper connecting seat 41 and the lower connecting seat 42 are connected by rotating the upper connecting seat 41 and the lower connecting seat 42 180 degrees through the axle pin 8. A safety lock 5 that is locked with the lower connecting seat 42 is installed on the rear side of the upper connecting seat 41.

[0026] A semicircular protrusion is formed on the inner side of the right upper connecting ear 411 of the upper connecting seat 41, and a semicircular right joint 43 is provided on the right side of the lower end of the upper connecting seat 41 to be positioned and docked with the semicircular protrusion. A semicircular protrusion is formed on the inner side of the left lower connecting ear 421 of the lower connecting seat 42, and a semicircular left joint 44 is provided on the left side of the upper end of the lower connecting seat 42 to be positioned and docked with the semicircular protrusion. The left joint 44 is a semicircular structure with an opening facing downward, and an L-shaped connecting piece 442 is formed at the rear end of the left joint 44, which is fixed to the upper end of the lower connecting seat 42 by screws. The right joint 43 is a semicircular structure with an opening facing upward, and an L-shaped connecting block 432 is formed at the rear end of the right joint 43, which is fixed to the lower end of the upper connecting seat 41 by screws; the lower end surface of the semicircular protrusion of the upper connecting seat 41 is provided with a positioning hole, and the inner wall of the semicircular structure of the right joint 43 is convexly provided with a corresponding positioning column 431, and the semicircular protrusion and the right joint 43 are positioned to form a circular structure through the positioning hole and the positioning column 431; the upper end surface of the semicircular protrusion of the lower connecting seat 42 is provided with a positioning concave hole, and the inner wall of the semicircular structure of the left joint 44 is convexly provided with a corresponding positioning boss 441, and the semicircular protrusion and the left joint 44 are positioned to form a circular structure through the positioning concave hole and the positioning boss 441.

[0027] The upper connecting seat 41 and the lower connecting seat 42 are respectively longitudinally formed with through holes for the upper support rod 21 and the middle support rod 22 to pass through. The upper connecting seat 41 and the lower connecting seat 42 are respectively sleeved on the lower end of the upper support rod 21 and the upper end of the middle support rod 22 and fixed by screws. A limiting notch 24 is opened on the front side of the upper end of the middle support rod 22 to facilitate the rotation of the upper connecting ear 43 and the lower connecting ear 44.

[0028] The rear end of the upper connecting seat 41 is longitudinally penetrated by a mounting groove 412 for installing the safety lock buckle 5. The safety lock buckle 5 includes a fixing plate 51 and a lock buckle 52. The fixing plate 51 is fixed to the upper position in the mounting groove 412 by screws. The middle part of the inner wall of the lock buckle 52 is hinged to the lower end of the fixing plate 51 by a fixing pin. The upper rear end of the lower connecting seat 42 is provided with a boss 422. The rear end surface of the boss 422 is recessed with a card slot 423 that cooperates with the lock buckle 52. A spring is supported between the upper end of the lock buckle 52 and the fixing plate, so that the lock buckle 52 has a tendency to always be locked with the card slot 423.

[0029] The rear part of the upper end surface of the lower connecting seat 42 is provided with a concave cavity for the boss 422 to be placed in, and the concave cavity is connected to the mounting groove 412. After the upper connecting seat 42 is aligned with the lower connecting seat 41, the slot 423 on the rear end surface of the boss 422 just falls in the mounting groove 412 near the bottom position, and the lock buckle 52 is a strip corresponding to the mounting groove 412. The upper part of the lock buckle 52 is a hand-pressing part inclined outward, and the inner lower end of the lock buckle 52 is bent inward to form a lock buckle part. Lugs 53 with axial holes are provided on the left and right sides of the middle part of the lock buckle 52, and fixing pins are provided on the left and right sides of the lower end of the fixing plate 51 to cooperate with the axial holes of the lugs 53. Arc grooves 413 for the lugs to be placed and rotated are recessed on the left and right sides of the middle part of the mounting groove 412. A spring column is convexly provided in the middle of the front end surface of the fixing plate 51, and the spring is sleeved on the spring column and supported against the upper part of the lock buckle 52.

[0030] A foldable support frame 6 is mounted on one side of the wheel frame 9. A fixed shaft 91 is attached to the side of the wheel frame 9. The roller 1 is removably mounted on the fixed shaft 91 and secured in place with a knob 10, making it easy to remove and replace the roller 1. A handle 3 is mounted on top of the support rod 2. The handle 3's main body is secured by a pair of left and right shells. A display screen 31 and buttons 32 are mounted on the top, a USB charging port 33 is located at the rear, and a central cavity houses the control circuit board and its rechargeable battery 34. The support frame 6 allows the rangefinder to be conveniently parked on a base surface when in use.

[0031] The working principle of the rangefinder is the same as that of the prior art and will not be further explained here.

[0032] In this embodiment, the length of the middle support rod 22 is greater than the upper support rod 21 and greater than the lower support rod 23, and the rotation direction of the lower group of folding mechanisms 4 is to rotate back and forth close to the roller 1, and the rotation direction of the upper group of folding mechanisms is to rotate toward the side away from the roller 1. In this way, the volume after folding is smaller, which is convenient for carrying and storage.

[0033] When folding is required, the support rod 2 can be folded by simply pressing the safety lock 5, which is very convenient to operate.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A foldable wheeled rangefinder comprising a wheel frame, a roller, a support rod, and a handle, wherein the roller is mounted on the wheel frame, a counter is provided in the wheel frame for cooperating with the roller, and the support rod and the handle are provided on the wheel frame, characterized in that: The support rod is divided into two or three foldable sections, and the adjacent upper and lower support rods are connected by a folding mechanism. The folding mechanism includes an upper connecting seat fixedly arranged at the lower end of the upper support rod and a lower connecting seat at the upper end of the lower support rod. The front side of the lower end of the upper connecting seat is formed with two arc-shaped upper connecting ears on the left and right, and the front side of the upper end of the lower connecting seat is formed with two lower connecting ears on the left and right that are docked with the upper connecting ears. The upper connecting seat and the lower connecting seat are rotated 180 degrees to be connected by an axle pin passing through the upper connecting ears and the lower connecting ears, and a safety lock buckle that is locked with the lower connecting seat is installed on the rear side of the upper connecting seat.

2. The wheeled distance meter according to claim 1, characterized in that: A semicircular protrusion is formed on the inner side of the right upper connecting ear of the upper connecting seat, and a semicircular right joint is provided on the right side of the lower end of the upper connecting seat to be positioned and docked with the semicircular protrusion. A semicircular protrusion is formed on the inner side of the left lower connecting ear of the lower connecting seat, and a semicircular left joint is provided on the left side of the upper end of the lower connecting seat to be positioned and docked with the semicircular protrusion.

3. The wheeled distance meter according to claim 2, characterized in that: The left joint is a semicircular structure with an opening facing downward, and an L-shaped connecting piece is formed at the rear end of the left joint, which is fixed to the upper end of the lower connecting seat by screws. The right joint is a semicircular structure with an opening facing upward, and an L-shaped connecting block is formed at the rear end of the right joint, which is fixed to the lower end of the upper connecting seat by screws; a positioning hole is provided on the lower end surface of the semicircular protrusion of the upper connecting seat, and a corresponding positioning column is convexly provided on the inner wall of the semicircular structure of the right joint, and the semicircular protrusion and the right joint are positioned to form a circular structure through the positioning hole and the positioning column; a positioning concave hole is provided on the upper end surface of the semicircular protrusion of the lower connecting seat, and a corresponding positioning convex column is convexly provided on the inner wall of the semicircular structure of the left joint, and the semicircular protrusion and the left joint are positioned to form a circular structure through the cooperation of the positioning concave hole and the positioning convex column.

4. The wheel distance meter according to claim 3, characterized in that: The upper connecting seat and the lower connecting seat are respectively longitudinally formed with through holes for the lower support rod and the upper support rod to pass through. The upper connecting seat and the lower connecting seat are respectively sleeved on the lower end of the upper support rod and the upper end of the lower support rod and fixed by screws. A limiting notch is opened on the front side of the upper end of the lower support rod to facilitate the rotation of the upper connecting ear and the lower connecting ear.

5. The wheeled distance meter according to claim 4, characterized in that: The rear end of the upper connecting seat is longitudinally penetrated by a recessed installation groove for the safety lock buckle. The safety lock buckle includes a fixing plate and a lock buckle. The fixing plate is fixed to the upper position in the installation groove by screws. The middle part of the inner wall of the lock buckle is hinged to the lower end of the fixing plate by a fixing pin. A boss is provided at the rear end of the upper end of the lower connecting seat. The rear end surface of the boss is recessed with a card slot that cooperates with the lock buckle. A spring is supported between the upper end of the lock buckle and the fixing plate, so that the lock buckle has a tendency to always be locked with the card slot.

6. The wheel type distance meter according to claim 5, characterized in that: The rear part of the upper end surface of the lower connecting seat is provided with a concave cavity for the boss to be placed in, and the concave cavity is connected to the mounting groove. After the upper connecting seat and the lower connecting seat are aligned, the slot on the rear end surface of the boss just falls in the mounting groove near the bottom position. The lock buckle is a strip corresponding to the mounting groove. The upper part of the lock buckle is a hand-pressing part inclined outward, and the inner lower end of the lock buckle is bent inward to form a lock buckle part. Lugs with axial holes are provided on the left and right sides of the middle part of the lock buckle, and fixing pins that cooperate with the axial holes of the lugs are provided on the left and right sides of the lower end of the fixing plate. Arc grooves for the lugs to be placed and rotated are recessed on the left and right sides of the middle part of the mounting groove. A spring column is convexly provided in the middle of the front end surface of the fixing plate, and the spring sleeve is arranged on the spring column and supports the upper part of the lock buckle.

7. The wheel distance meter according to any one of claims 1 to 6, characterized in that: A foldable support frame is installed on one side of the wheel frame, and a handle is installed on the top of the support rod.

8. The wheel distance meter according to any one of claims 1 to 6, characterized in that: The support rod is divided into three sections: upper, middle and lower. The length of the middle section support rod is greater than that of the upper section support rod and greater than that of the lower section support rod. The folding mechanism is divided into two groups. The rotation direction of the folding mechanism of the lower group is to rotate back and forth close to the roller, and the rotation direction of the folding mechanism of the upper group is to rotate toward the side away from the roller.

9. The wheel distance meter according to any one of claims 1 to 6, characterized in that: The side surface of the wheel frame is provided with a fixed shaft, and the roller is detachably mounted on the fixed shaft and is fixed by a knob.

10. The wheel distance meter according to any one of claims 1 to 6, characterized in that: The main body of the handle is fixed by fitting left and right shells, a display screen and buttons are installed on the top, a USB charging interface is provided at the tail, and a control circuit board and a rechargeable battery are installed in the middle cavity.

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