Friction deceleration type measuring tape

Abstract

The embodiment of the utility model provides a friction deceleration type measuring tape, and relates to the technical field of measuring tools. The friction speed reduction type measuring tape comprises a shell, a hub assembly and a speed reduction mechanism. A rotating shaft is arranged in the shell. The hub assembly is located within the housing. The hub assembly is arranged on the rotating shaft in a sleeving mode and can rotate around the rotating shaft. The hub assembly is used for installing a ruler belt. The speed reducing mechanism comprises a friction ring and a sliding block assembly. The friction ring is fixedly arranged in the shell. The sliding block assembly is in sliding connection with the hub assembly, and the sliding block assembly can be close to or away from the friction ring. According to the friction deceleration type measuring tape, the tape recovery speed can be reduced in the tape recovery process, the tape is prevented from cutting hands, and the safety performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to measuring tool technical field, specifically, relate to a friction deceleration formula measuring tape. BACKGROUND

[0002] Measuring tape is the daily life commonly used work measuring tool. When using measuring tape, the tape in the measuring tape is pulled out and fixed, and then measurement is carried out. When recovering the tape, the external tape is recovered and wound into the measuring tape shell by the coil spring in the measuring tape.

[0003] The inventor found that the existing steel measuring tape is easy to cut the hand when recovering the tape, and the tape is easy to bend and recover, which can hit the personnel and has safety hazards. UTILITY MODEL CONTENTS

[0004] The utility model discloses a friction deceleration formula measuring tape, which can reduce the tape recovery speed during recovery, avoid cutting the hand when recovering the measuring tape, and improve the safety performance.

[0005] The embodiment of the utility model can be realized as follows:

[0006] The utility model provides a friction deceleration formula measuring tape, which comprises:

[0007] A housing is provided with a rotating shaft inside the housing;

[0008] A hub assembly is located inside the housing, the hub assembly is sleeved on the rotating shaft and can rotate around the rotating shaft;

[0009] A speed reduction mechanism comprises a friction ring and a sliding block assembly, the friction ring is fixedly arranged in the housing, the sliding block assembly is slidably connected with the hub assembly, and the sliding block assembly can move close to or away from the friction ring.

[0010] In an optional embodiment, the sliding block assembly comprises a sliding block, the hub assembly is provided with a sliding groove, the sliding block is slidably matched with the sliding groove, a reset member is arranged between the sliding block and the hub assembly, and the reset member is used for moving the sliding block away from the friction ring.

[0011] In an optional embodiment, a guide hole is formed in the sliding block, and a guide column matched with the guide hole is arranged in the sliding groove.

[0012] In an optional embodiment, the reset member is a spring, the spring is sleeved on the guide column and located in the guide hole, one end of the spring abuts against the bottom surface of the guide hole, and the other end of the spring abuts against the guide column.

[0013] In an optional embodiment, the sliding block assembly further comprises a friction block, which is fixedly connected to the sliding block at one end close to the friction ring, and is provided with a curved surface corresponding to the inner wall of the friction ring at one side close to the friction ring.

[0014] In an optional embodiment, the friction block is detachably connected to the sliding block, and a counterbore is formed in the friction block.

[0015] In an optional embodiment, the thickness of the friction ring in a direction perpendicular to the center line of the friction ring gradually increases and then decreases in a direction along the center line.

[0016] In an optional embodiment, one side of the friction ring is provided with a fixed baffle, and the other side of the friction ring is fixedly connected to the inner wall of the shell.

[0017] In an optional embodiment, one side of the friction ring close to the inner wall of the shell is provided with a positioning groove, and the inner wall of the shell is provided with a positioning column matched with the positioning groove.

[0018] In an optional embodiment, the hub assembly comprises a hub and a shaft sleeve, the shaft sleeve is sleeved on the rotating shaft, and the hub is fixedly connected to the shaft sleeve.

[0019] The friction deceleration type tape measure provided by the embodiment of the utility model has the beneficial effects that:

[0020] The friction deceleration type tape measure comprises a shell, a hub assembly and a deceleration mechanism. A rotating shaft is arranged in the shell. The hub assembly is located in the shell. The hub assembly is sleeved on the rotating shaft and can rotate around the rotating shaft. The hub assembly is used for mounting a tape. The deceleration mechanism comprises a friction ring and a sliding block assembly. The friction ring is fixedly arranged in the shell. The sliding block assembly is slidably connected to the hub assembly, and the sliding block assembly can move close to or away from the friction ring. The friction deceleration type tape measure is provided with the sliding block assembly which slides on the hub assembly. When the tape measure retracts the tape, the hub assembly rotates, and the sliding block assembly moves towards the friction ring under the centrifugal force. When the sliding block assembly abuts against the friction ring, the hub assembly reduces the rotating speed under the friction force, thereby reducing the tape retracting speed. The friction deceleration type tape measure can reduce the tape retracting speed in the process of retracting the tape, avoids the tape cutting the hand, and improves the safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative labor.

[0022] Figure 1 An exploded structural schematic view of the friction deceleration type tape measure provided in the present embodiment is shown in FIG. 1.

[0023] Figure 2 An exploded structural schematic view of the slider assembly provided in the present embodiment is shown in FIG. 4.

[0024] Figure 3 A cross-sectional structural schematic view of the friction deceleration type tape measure provided in the present embodiment is shown in FIG. 5.

[0025] Figure 4 An enlarged view of the middle A portion. Figure 3

[0026] Reference signs: 100-friction deceleration type tape measure; 10-housing; 11-upper cover; 12-base; 13-rotating shaft; 14-locking mechanism; 20-hub assembly; 21-hub; 211-slotted guide; 212-guiding post; 22-axle sleeve; 30-deceleration mechanism; 31-friction ring; 311-positioning slot; 312-fixing baffle; 32-slider assembly; 321-slider; 3211-guiding hole; 322-returning member; 323-friction block; 3231-counterbore. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0029] It should be noted that: similar reference signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] ​In the description of the utility model, it needs to be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] In addition, if the terms "first", "second" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0033] Please refer to Figures 1-4 The utility model provides a friction deceleration type tape measure 100, it includes casing 10, wheel hub assembly 20 and deceleration mechanism 30.

[0034] The shaft 13 is arranged in the casing 10.The casing 10 is used to accommodate the wheel hub assembly 20 and the deceleration mechanism 30.In this embodiment, the casing 10 includes a base 12 and an upper cover 11.The shaft 13 is fixedly arranged on the base 12.

[0035] The wheel hub assembly 20 is located in the casing 10.The wheel hub assembly 20 is sleeved on the shaft 13 and can rotate around the shaft 13.It can be understood that the wheel hub assembly 20 is used to install the tape.The tape is wound on the wheel hub assembly 20.Further, the wheel hub assembly 20 is also provided with a winding spring (not shown in the figure) for driving the tape to be retracted.The casing 10 is also provided with a locking mechanism 14 for fixing the tape.

[0036] When measurement is needed, the tape is pulled out, and the locking mechanism 14 on the casing 10 is used to fix the tape, so that measurement can be carried out.When the tape measure is retracted, the locking mechanism 14 is loosened, and the wheel hub assembly 20 rotates under the action of the winding spring, thereby pulling the tape to be retracted into the casing 10.

[0037] In order to reduce the retraction speed of the tape, the friction deceleration type tape measure 100 of the embodiment further includes a deceleration mechanism 30.The deceleration mechanism 30 includes a friction ring 31 and a sliding block assembly 32.The friction ring 31 is fixedly arranged in the casing 10.The sliding block assembly 32 is in sliding connection with the wheel hub assembly 20, and the sliding block assembly 32 can approach or move away from the friction ring 31.

[0038] Specifically, the friction ring 31 is fixed on one side of the hub assembly 20. The friction ring 31 is in a circular ring shape. The slider assembly 32 is arranged on the side of the hub assembly 20 close to the friction ring 31 and is located in the friction ring 31. The center line of the friction ring 31 coincides with the axis of the rotating shaft 13.

[0039] It can be understood that when the ruler tape is recovered, the hub assembly 20 rotates, and the slider assembly 32 moves outward relative to the hub assembly 20 under the centrifugal force, that is, moves close to the friction ring 31. When the slider assembly 32 abuts against the friction ring 31, friction occurs, and the hub assembly 20 reduces the rotating speed under the action of the friction force, thereby reducing the ruler tape recovery speed and avoiding that the ruler tape moving at high speed cuts the human hand.

[0040] Further, the slider assembly 32 comprises a slider 321. The hub assembly 20 is provided with a sliding groove 211. The slider 321 is in sliding fit with the sliding groove 211. A reset member 322 is arranged between the slider 321 and the hub assembly 20. The reset member 322 is used to move the slider 321 away from the friction ring 31. It can be understood that when the rotating speed of the hub assembly 20 is low or the ruler tape recovery is completed, the reset member 322 is used to move the slider 321 away from the friction ring 31. When the rotating speed of the hub assembly 20 is high, the acting force of the reset member 322 on the slider 321 is not enough to overcome the centrifugal force of the slider 321, and the slider 321 gradually moves close to the friction ring 31.

[0041] Optionally, in the embodiment, the sliding groove 211 is in a direction perpendicular to the rotating shaft 13. In other embodiments, the sliding groove 211 can be arranged at an angle with the direction perpendicular to the rotating shaft 13. As long as the slider assembly 32 can move close to or away from the friction ring 31 and abut against the friction ring 31, the utility model does not make any limitation.

[0042] Further, in order to avoid that the slider 321 is taken out of the sliding groove 211, a guide hole 3211 is formed on the slider 321. A guide column 212 is arranged in the sliding groove 211 and matches the guide hole 3211. Specifically, the extension direction of the guide column 212 and the guide hole 3211 is consistent with the extension direction of the sliding groove 211. In the embodiment, the extension direction of the guide column 212 and the guide hole 3211 is perpendicular to the direction of the rotating shaft 13, so as to ensure that the slider 321 will not be taken out of the sliding groove 211 and prevent that the slider 321 is dislocated with the friction ring 31.

[0043] Specifically, in the embodiment, the reset member 322 is a spring. The spring is sleeved on the guide column 212 and is located in the guide hole 3211. One end of the spring abuts against the bottom surface of the guide hole 3211, and the other end of the spring abuts against the guide column 212.

[0044] In other embodiments, the reset member 322 can be arranged at other positions, for example, outside the guide hole 3211, as long as the reset member 322 is arranged between the sliding block 321 and the hub assembly 20.

[0045] Further, the sliding block assembly 32 further comprises a friction block 323. The friction block 323 is fixedly connected to one end of the sliding block 321 close to the friction ring 31. The friction block 323 is provided with a curved surface corresponding to the inner wall of the friction ring 31 on one side close to the friction ring 31. It can be understood that when the hub assembly 20 rotates, the curved surface of the friction block 323 can completely abut against the inner wall of the friction ring 31, thereby increasing the contact area and the friction force.

[0046] Still further, the friction block 323 is detachably connected to the sliding block 321. It can be understood that the friction block 323 and the friction ring 31 are prone to wear, and the detachable connection of the friction block 323 and the sliding block 321 facilitates the disassembly and replacement of the friction block 323. Specifically, in the present embodiment, the friction block 323 and the sliding block 321 are connected by screws. A counterbore 3231 is formed on the friction block 323, and the screw head of the screw is located in the counterbore 3231. It can be understood that when the friction block 323 is worn, the screw head of the screw is prevented from contacting the friction ring 31.

[0047] In the present embodiment, the thickness of the friction ring 31 in the direction perpendicular to the center line of the friction ring 31 gradually increases and then decreases in the direction along the center line. Specifically, the inner wall of the friction ring 31 gradually approaches the friction block 323 in the direction along the center line and gradually moves away from the friction block 323. It can be understood that the friction ring 31 has a structure of thick in the middle and thin at both ends, which prevents the friction block 323 from shaking up and down during friction, resulting in uneven friction depth and further causing misaligned friction, which causes the hub assembly 20 to shake up and down.

[0048] In order to fix the friction ring 31, one side of the friction ring 31 is provided with a fixed baffle 312. The other side of the friction ring 31 is fixedly connected to the inner wall of the shell 10. It can be understood that the friction ring 31 is fixed relative to the shell 10. The fixed baffle 312 is used to limit the movement of the friction ring 31 along the center line direction.

[0049] Further, the friction ring 31 is provided with a positioning groove 311 on one side close to the inner wall of the shell 10. The inner wall is provided with a positioning column matched with the positioning groove 311. Specifically, in the present embodiment, the number of the positioning groove 311 and the positioning column is multiple. The positioning grooves 311 are arranged at intervals along the circumference of the friction ring 31. The positions of the positioning columns are correspondingly arranged with the positioning grooves 311. It can be understood that the positioning groove 311 and the positioning column are used to prevent the rotation of the friction ring 31 around the center line, avoiding the reduction of the friction force between the friction ring 31 and the friction block 323.

[0050] Optionally, in other embodiments, the positioning column can be arranged on the friction ring 31 and arranged towards the shell 10. The positioning groove 311 can be arranged on the shell 10. It is only required that the friction ring 31 cannot rotate.

[0051] In order to facilitate the installation and disassembly of the hub assembly 20 and the sliding block assembly 32, the hub assembly 20 comprises a hub 21 and a shaft sleeve 22. The shaft sleeve 22 is sleeved on the rotating shaft 13. The hub 21 is fixedly connected with the shaft sleeve 22 through screws. In the embodiment, the sliding groove 211 is arranged on the hub 21. When the shaft sleeve 22 is fixedly connected with the hub 21, the shaft sleeve 22 blocks the sliding interval of the sliding groove 211, so as to prevent the sliding block 321 from sliding out. When it is required to disassemble the sliding block 321, the shaft sleeve 22 and the hub 21 need to be separated first, and then the sliding block 321 can be separated from the guide column 212.

[0052] The friction deceleration type tape measure 100 provided by the embodiment has the following beneficial effects:

[0053] The friction deceleration type tape measure 100 comprises a shell 10, a hub assembly 20 and a deceleration mechanism 30. The shell 10 is internally provided with a rotating shaft 13. The hub assembly 20 is located in the shell 10. The hub assembly 20 is sleeved on the rotating shaft 13 and can rotate around the rotating shaft 13. The hub assembly 20 is used for mounting a tape. The deceleration mechanism 30 comprises a friction ring 31 and a sliding block assembly 32. The friction ring 31 is fixedly arranged in the shell 10. The sliding block assembly 32 is slidably connected with the hub assembly 20, and the sliding block assembly 32 can move close to or away from the friction ring 31. The friction deceleration type tape measure 100 is characterized in that the sliding block assembly 32 is slidably arranged on the hub assembly 20. When the tape measure is recovering the tape, the hub assembly 20 rotates, and the sliding block assembly 32 moves towards the friction ring 31 under the centrifugal force. When the sliding block assembly 32 abuts against the friction ring 31, the hub assembly 20 is reduced in rotating speed under the friction force, so as to reduce the tape recovery speed. The friction deceleration type tape measure 100 can reduce the tape recovery speed in the process of recovering the tape, avoid the tape from cutting the hand and improve the safety performance.

[0054] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A friction-reduction type measuring tape, characterized in that, include: A housing, wherein a rotating shaft is disposed within the housing; A hub assembly, located within the housing, is sleeved on the pivot and is rotatable around the pivot; A deceleration mechanism includes a friction ring and a slider assembly. The friction ring is fixedly disposed within the housing, and the slider assembly is slidably connected to the hub assembly, and the slider assembly can move closer to or further away from the friction ring. The slider assembly includes a slider, the hub assembly is provided with a groove, the slider slides in cooperation with the groove, and a reset member is provided between the slider and the hub assembly, the reset member being used to move the slider away from the friction ring.

2. The friction-reduction tape measure according to claim 1, characterized in that, The slider has a guide hole, and the groove has a guide post that cooperates with the guide hole.

3. The friction-reduction type measuring tape according to claim 2, characterized in that, The reset component is a spring, which is sleeved on the guide post and located inside the guide hole. One end of the spring abuts against the bottom surface of the guide hole, and the other end of the spring abuts against the guide post.

4. The friction-reducing tape measure according to claim 1, characterized in that, The slider assembly also includes a friction block, which is fixedly connected to one end of the slider near the friction ring. The side of the friction block near the friction ring has a curved surface corresponding to the inner wall of the friction ring.

5. The friction-reduction type measuring tape according to claim 4, characterized in that, The friction block is detachably connected to the slider, and the friction block has a countersunk hole.

6. The friction-reducing tape measure according to claim 1, characterized in that, The thickness of the friction ring gradually increases and then decreases along the direction perpendicular to the center line of the friction ring.

7. The friction-reducing tape measure according to claim 1, characterized in that, A fixed baffle is provided on one side of the friction ring, and the other side of the friction ring is fixedly connected to the inner wall of the housing.

8. The friction-reducing tape measure according to claim 7, characterized in that, The friction ring has a positioning groove on the side near the inner wall of the housing, and the inner wall of the housing has a positioning post that mates with the positioning groove.

9. The friction-reducing tape measure according to claim 1, characterized in that, The hub assembly includes a hub and a bushing, the bushing is sleeved on the rotating shaft, and the hub is fixedly connected to the bushing.

Images