Measuring tape

Abstract

The utility model discloses a measuring tape, which comprises a shell, a rotating shaft, a rotating core, a speed reduction block and a friction piece. When the ruler of the measuring tape retracts, the rotating core rotates, the speed reduction block moves towards the direction close to the friction piece, the speed reduction block makes contact with the friction piece and generates friction, the rotating speed of the rotating core is reduced, and therefore the situation that fingers, palms or other body parts are cut can be effectively avoided, and use safety is improved.

Description

Technical Field

[0001] The utility model relates to a measuring tape. Background Art

[0002] Existing measuring tapes often have the function of automatically retracting the ruler. However, during the ruler retraction process, due to the action of the winding spring, the ruler's rewinding speed will become faster and faster. On the one hand, the quickly retracted ruler may easily cut fingers, palms or other body parts, which may easily lead to danger and lack of safety. On the other hand, due to the high speed and large impact force, the hook on the ruler head may be damaged, thus affecting the service life of the measuring tape.

[0003] It can be seen that whether it is possible to provide an improved tape measure based on the shortcomings of the existing tape measures has become a technical problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a tape measure in order to overcome the defects in the prior art.

[0005] The utility model solves the above technical problems through the following technical solutions: a tape measure, characterized in that it comprises: a housing; a rotating shaft, which is arranged in the housing; a rotating core, which is used for winding the ruler, and the rotating core is rotatably sleeved on the rotating shaft, and a slideway is provided on the side wall of the rotating core which is perpendicular to the rotating shaft;

[0006] A deceleration block is slidably disposed in the slideway; a friction member is installed on a side of the housing close to the slideway, and the friction member is located on the outside of the slideway to block the opening of the slideway; wherein, when the ruler of the tape measure is retracted, the rotating core rotates, and the deceleration block moves in the slideway toward the friction member, and the deceleration block contacts the friction member and generates friction, so that the rotation speed of the rotating core decreases.

[0007] Preferably, the friction member is an annular structure.

[0008] Preferably, a contact surface matching with the friction member is provided at one end of the speed reduction block close to the friction member, and the outer contour of the contact surface matches the shape of the inner contour of the friction member.

[0009] Preferably, the ratio of the total length of the contact surface of the speed reduction block to the inner circumference of the friction member is 0.1-0.5.

[0010] Preferably, the speed reduction block is a flat plate-shaped structure.

[0011] Preferably, the total weight of the speed reduction block is greater than 1g.

[0012] Preferably, it further comprises: a blocking portion, which is arranged on one end of the side wall of the slideway close to the shell.

[0013] Preferably, the rotating core includes a first side plate, a second side plate and a connecting part; the diameter of the first side plate is the same as the diameter of the second side plate, the diameters of the first side plate and the second side plate are larger than the diameter of the connecting part, and the ruler of the tape measure is wrapped around the connecting part and is located between the first side plate and the second side plate.

[0014] Preferably, the slideway is provided on the first side panel; and / or the slideway is provided on the second side panel.

[0015] Preferably, the slideway extends along the radial direction of the rotating core.

[0016] Preferably, the shell includes: On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain various preferred embodiments of the utility model.

[0017] The positive progress effect of the utility model is that the tape measure of the utility model includes a housing, a rotating shaft, a rotating core, a speed reduction block and a friction member. When the ruler of the tape measure of the utility model is retracted, the rotating core rotates, and the speed reduction block moves toward the direction close to the friction member. The speed reduction block contacts the friction member and generates friction, so that the rotation speed of the rotating core decreases, thereby effectively avoiding the situation of cutting fingers, palms or other body parts, improving the safety of use and avoiding the impact damage of the hook on the housing, which affects the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a disassembled state of a tape measure according to a preferred embodiment of the utility model.

[0019] Figure 2 This is a structural diagram of the tape measure of the preferred embodiment of the utility model with the housing and the rotating shaft hidden.

[0020] Figure 3 This is an assembly structure diagram of the rotating core, the speed reduction block and the blocking part of the preferred embodiment of the utility model.

[0021] Figure 4 This is a structural diagram of the rotating core of a preferred embodiment of the utility model.

[0022] Figure 5 This is a structural diagram of the housing and rotating shaft of a preferred embodiment of the utility model.

[0023] Figure 6 This is a structural diagram of a speed reduction block according to a preferred embodiment of the utility model.

[0024] Figure 7This is a schematic diagram of the disassembled state of the rotating core, the speed reduction block and the friction member of the preferred embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] It should be noted that in the claims and description of this patent, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] like Figure 1-Figure 7 As shown, this embodiment discloses a tape measure, which includes a housing 1, a rotating shaft 2, a rotating core 3, a speed reduction block 4 and a friction member 5.

[0028] In this embodiment, the housing 1 includes a base 11 and a cover 12 which are assembled together in a detachable manner. The base 11 is provided with a mounting groove 111, and the rotating shaft 2 and the rotating core 3 are mounted in the mounting groove 111. The cover 12 covers the opening of the mounting groove 111 and is detachably connected to the base 11. In this embodiment, the split housing 1 is adopted, which can facilitate the installation of the rotating shaft 2 and the rotating core 3, and is also convenient for opening the housing 1 to check the internal condition of the tape measure and to repair and replace damaged parts after the tape measure fails.

[0029] The rotating shaft 2 is disposed in the base 11 of the housing 1 , and the extending direction of the rotating shaft 2 is a first direction.

[0030] The rotating core 3 is the part of the ruler that is wound around and stored with the measuring tape, and is in the shape of a disk as a whole. The rotating core 3 is rotatably mounted on the rotating shaft 2, and a slideway 34 is provided on the side wall of the rotating core 3 perpendicular to the rotating shaft 2 (the side wall extending in a direction perpendicular to the first direction). In this embodiment, the number of the slideways 34 is two, and they are symmetrically distributed along the center of the rotating shaft 2. In other alternative embodiments, the number of the slideways 34 may also be three, four, etc., and may be evenly distributed along the axial direction, but is not limited thereto.

[0031] Furthermore, in this embodiment, the slideway 34 extends in the radial direction of the rotating core 3, so that when the rotating core 3 rotates, the speed reduction block 4 is subjected to a centrifugal force that is always directed away from the axis, which can enable the speed reduction block 4 to perform centrifugal motion in the slideway 34, thereby improving the movement efficiency of the speed reduction block 4.

[0032] Further, in this embodiment, the rotating core 3 includes a first side plate 31, a second side plate 32 and a connecting portion 33. The diameter of the first side plate 31 is the same as the diameter of the second side plate 32, and the diameter of the first side plate 31 and the second side plate 32 is larger than the diameter of the connecting portion 33. The ruler of the tape measure is wound around the connecting portion 33 and is located between the first side plate 31 and the second side plate 32. In this embodiment, the above-mentioned structural form can prevent the ruler from being scattered and facilitate the storage of the ruler.

[0033] In this embodiment, a slideway 34 is provided on the first side plate 31, and a deceleration block 4 is provided in the slideway 34. Of course, a slideway 34 can also be provided on the second side plate 32, and a deceleration block 4 can also be provided in the slideway 34. When this solution is adopted, the deceleration effect can be improved.

[0034] The speed reduction block 4 is slidably disposed in the slideway 34. The friction member 5 is fixedly disposed on the housing 1, specifically disposed on a side close to the slideway 34. In this embodiment, the friction member 5 is disposed on the cover 12. Of course, when the slideway is disposed on the other side of the rotating core 3, the friction member 5 is disposed on the base 11. The friction member 5 is on the outside of the slideway 34 and blocks the opening of the slideway 34 to limit the speed reduction block 4 from sliding out of the slideway 34. In this embodiment, the speed reduction block is a flat plate-like structure, which can make the speed reduction block 4 slide more stably in the slideway 34 and avoid getting stuck in the slideway to affect the use.

[0035] More specifically, the total weight of the deceleration block 4 is greater than or equal to 1g, so as to avoid the deceleration block being too light, resulting in a small friction force with the friction member 5 and a poor deceleration effect. The preferred total weight of the deceleration block 4 is 3g. In this embodiment, the number of deceleration blocks 4 is 2, and the weight of each deceleration block 4 is 1.5g. In other embodiments, if the number of deceleration blocks 4 is 3, the weight of each deceleration block 4 is 1g.

[0036] The specific material of the speed reduction block 4 is metal, preferably steel. Such a configuration can increase the service life of the speed reduction block and avoid wear and tear due to long-term use.

[0037] Further, in this embodiment, the friction member 5 is an annular structure, which is fixed on the housing and can block the outlets of all slideways 34. In this embodiment, the annular integrated friction member 5 is used, which can facilitate the installation of the friction member 5. Of course, in other alternative embodiments, the friction member 5 can also be split, and each friction member 5 blocks the outlet of the corresponding slideway 34 separately.

[0038] In this embodiment, the end of the speed reduction block 4 close to the friction member 5 is provided with a contact surface that matches the friction member 5, and the shape of the outer contour of the contact surface matches the shape of the inner contour of the friction member 5, and the specific curvature of the contact surface is consistent with the curvature of the friction member 5. The end of the speed reduction block 4 close to the friction member 5 is provided with a chamfer, so as to avoid the phenomenon that the core 3 cannot rotate after the speed reduction block 4 and the friction member 5 are stuck to each other, and the ruler cannot be retracted. In addition, the ratio of the total length of the contact surface of the speed reduction block 4 of this embodiment to the inner circumference of the friction member 5 is 0.1-0.5, the preferred ratio is 0.2-0.4, and the best is 0.25. The total length of the contact surface here refers to the sum of the arc lengths of the contact surfaces of multiple speed reduction blocks 4. In this embodiment, by increasing the contact surface between the speed reduction block and the friction member, that is, the speed reduction block and the friction member are in surface contact, the deceleration effect can be improved.

[0039] The tape measure of this embodiment also includes a blocking portion 6 arranged on the side wall of the slide 34 near one end of the shell 1. The blocking portion 6 blocks the speed reduction block 4 in the slide 34, restricting the speed reduction block 4 to move only in the direction close to or away from the friction member 5 but not in other directions, thereby preventing the speed reduction block 4 from escaping from the slide 34 and increasing the stability of the speed reduction block 4 in the slide 34.

[0040] Furthermore, in this embodiment, the measuring tape also includes a braking structure 7 and a hook 8 .

[0041] The braking structure 7 is installed on the shell 1, and the braking structure 7 locks / unlocks the rotating core 3 to the shell 1. When the braking structure 7 locks the rotating core 3 to the shell 1, the rotating core 3 cannot rotate, and the retraction of the ruler can be stopped at this time, otherwise it cannot be stopped, so that it is convenient to control whether the ruler is retracted or not.

[0042] The hook 8 is mounted on the housing 1 so that the measuring tape can be hung on the body for carrying or hung at other desired locations.

[0043] In this embodiment, when the ruler of the tape measure is retracted, the rotating core 3 rotates, and the speed reduction block 4 moves toward the direction close to the friction member 5. The speed reduction block 4 contacts the friction member 5 and generates friction, so that the rotation speed of the rotating core 3 decreases, thereby effectively avoiding cutting of fingers, palms or other body parts, thereby improving the safety of use.

Claims

1. A tape measure, characterized in that: include: case; A rotating shaft is disposed in the housing; A rotating core, the rotating core is used for winding the ruler, the rotating core is rotatably mounted on the rotating shaft, and a slideway is provided on the side wall of the rotating core perpendicular to the rotating shaft; a speed reduction block is slidably arranged in the slideway; a friction member is installed on a side of the shell close to the slideway, and the friction member is located on the outside of the slideway to block the opening of the slideway; wherein, when the ruler of the tape measure is retracted, the rotating core rotates, and the speed reduction block moves in the slideway toward the friction member, and the speed reduction block contacts the friction member and generates friction, so that the rotation speed of the rotating core decreases.

2. The measuring tape according to claim 1, wherein: The friction member is an annular structure.

3. The tape measure according to claim 2, wherein: A contact surface matching with the friction member is arranged at one end of the speed reduction block close to the friction member, and the outer contour of the contact surface matches the shape of the inner contour of the friction member.

4. The tape measure according to claim 3, wherein: The ratio of the total length of the contact surface of the speed reduction block to the inner circumference of the friction member is 0.1-0.

5.

5. The tape measure according to claim 1, wherein: The speed reduction block is a flat plate-shaped structure.

6. The measuring tape according to claim 1, wherein: The total weight of the speed reduction block is greater than 1 g.

7. The tape measure according to claim 1, wherein: Also includes: The blocking portion is arranged on an end of the side wall of the slideway close to the shell.

8. The measuring tape according to claim 1, wherein: The rotating core comprises a first side plate, a second side plate and a connecting portion; The diameter of the first side plate is the same as the diameter of the second side plate, and the diameters of the first side plate and the second side plate are larger than the diameter of the connecting portion, and the ruler of the tape measure is wound around the connecting portion and is located between the first side plate and the second side plate.

9. The measuring tape according to claim 8, wherein: The slideway is provided on the first side panel; and / or the slideway is provided on the second side panel.

10. The measuring tape according to claim 1, wherein: The slideway extends along the radial direction of the rotating core.

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