Self-retracting measuring tape

Abstract

The utility model discloses a self-retracting measuring tape. The self-retracting measuring tape comprises a main shell, a tape core disc and a tape band, the main shell is composed of a first shell and a second shell which are mutually fixed, a rotating shaft is arranged in the main shell, and a strip-shaped through hole is formed in the rotating shaft. The ruler core disc is arranged in the main shell and rotates through the rotating shaft, a coil spring groove is formed in the ruler core disc, one end of a coil spring is fixed to the strip-shaped through hole, and the other end is connected with the ruler core disc. And one end of the tape is fixed with the tape core disc, and the other end of the tape penetrates out of the tape through hole of the main shell and is fixed with a tape hook. The rotating shaft is provided with a shaft part and positioning caps at the two ends, each positioning cap comprises a disc and a protruding part and is matched with a limiting groove in the shell, a first gear ring is arranged in the first shell, and a second gear ring is arranged on the cover component. According to the measuring tape, the tape core disc can be installed through the simple auxiliary insert, the overall structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring tools, and more specifically, to a self-retracting measuring tape. Background Art

[0002] Existing self-retracting tape measures generally face the problem of cumbersome and complicated coil spring installation process in design and application. Specifically, the coil spring assembly of traditional self-retracting tape measures usually needs to be assembled in multiple steps. These steps not only require the operator to have certain professional skills, but also often require the use of complex special tools to complete. In addition, due to the high elasticity and sensitivity of the coil spring itself, the slightest carelessness during the installation process may cause the spring to deform or be damaged, thereby affecting the automatic retraction effect and measurement accuracy of the tape measure. What is more troublesome is that the installation position of the coil spring is often located deep inside the tape measure, which not only increases the difficulty of maintenance and replacement, but also makes it difficult for users to handle it on their own if the coil spring fails or ages during daily use. It needs to be sent back to a professional repair point for repair, which greatly increases the cost and time cost of use. In addition, in order to simplify the installation process, some self-retracting tape measures on the market have tried to adopt a quick-release design, but these designs often sacrifice the structural stability and durability of the product, resulting in the tape measure becoming loose or failing after long-term and frequent use.

[0003] Based on the above reasons, it is necessary to improve the existing technology. Utility Model Content

[0004] 1. Technical Problems to be Solved

[0005] The present invention aims to overcome the above-mentioned defects in the prior art and proposes a self-retracting measuring tape to solve the problems raised in the above-mentioned background technology.

[0006] 2. Technical Solution

[0007] In order to solve the above technical problems, the utility model provides a self-retracting measuring tape, comprising:

[0008] A main housing, the main housing comprising a first housing and a second housing fixed to each other, a rotating shaft fixed in the main housing, and a strip-shaped through hole provided on the rotating shaft;

[0009] The ruler core disk is disposed in the main housing and is rotatably supported by the rotating shaft. The ruler core disk includes a coil spring groove for accommodating a coil spring. A coil spring is disposed in the coil spring groove. One end of the coil spring is fixed to the strip through-hole, and the other end is fixed to the ruler core disk.

[0010] The tape is wound around the core disk, with one end fixed to the core disk and the other end passing through the tape through-hole of the main housing, and a hook is fixed to the end of the tape passing through the tape through-hole;

[0011] The rotating shaft includes a shaft portion and positioning caps fixed at both ends of the shaft portion, the positioning cap includes a disc and a raised portion with a tooth portion protruding from the middle of the disc, and a limiting groove with a shape matching the raised portion is provided at a position opposite to the first shell and the second shell and the raised portion, a first tooth ring matching the raised portion is provided in the limiting groove of the first shell, and a second tooth ring is provided on the cover component.

[0012] Wherein, the ruler core disk includes a detachable cover provided on the ruler core disk, and the cover covers the open end of the coil spring slot.

[0013] The cover includes a plurality of buckle grooves evenly distributed at circumferential intervals, and buckle claws are provided at corresponding positions on the open ends of the coil spring grooves. The buckle claws cooperate with the buckle grooves to fix the cover.

[0014] Among them, positioning protrusions are distributed between the buckle grooves, and a positioning groove that cooperates with the positioning protrusions is provided at a corresponding position of the open end of the coil spring groove.

[0015] The ruler core disk includes two limiting walls that form a space for the ruler tape to be wound around, and holes are hollowed out on the limiting walls.

[0016] 3. Beneficial Effects

[0017] Compared with the prior art, the utility model has the following beneficial effects: the tape measure of the utility model only needs a simple auxiliary insert to complete the installation of the tape measure core disk, and the overall structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0019] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0020] Figure 3 This is a schematic diagram of the exploded core disk.

[0021] Figure 4 It is a cross-sectional schematic diagram of the ruler core disk.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the first shell.

[0023] Figure 6 Schematic diagram of the three-dimensional structure of the second shell. DETAILED DESCRIPTION

[0024] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] See also Figure 1-4 The utility model provides a self-retracting measuring tape, which is characterized by comprising:

[0026] A main housing 1, comprising a first housing 11 and a second housing 12 fixed to each other, a rotating shaft 2 fixed in the main housing 1, and a strip-shaped through hole 20 provided on the rotating shaft 2;

[0027] The ruler core disk 3 is disposed within the main housing 1 and is rotatably supported by the rotating shaft 2. The ruler core disk 3 includes a coil spring slot 30 for accommodating a coil spring. A coil spring is disposed within the coil spring slot 30. One end of the coil spring is fixed to the strip-shaped through-hole 20, and the other end is fixed to the ruler core disk 3.

[0028] The tape 4 is wound on the tape core disk 3, and one end of the tape is fixed to the tape core disk 3, and the other end passes through the tape through-hole of the main shell 1, and a ruler hook 5 is fixed to the end of the tape passing through the tape through-hole.

[0029] Among them, the rotating shaft 2 includes a shaft portion 21 and a positioning cap 22 fixed at both ends of the shaft portion 21, the positioning cap 22 includes a disc and a raised portion with a tooth portion protruding from the middle of the disc, and a limiting groove 100 with a shape matching the raised portion is arranged at a position opposite to the first shell 11 and the second shell 12 and the raised portion. A first tooth ring 101 matching the raised portion is arranged in the limiting groove of the first shell 11, and a second tooth ring 102 is arranged on the cover component.

[0030] In the above structure, after the coil spring is installed in the ruler core disk 3, the coil spring is tightened by rotating the shaft 2. At this time, the coil spring is tightened between the protrusion of the positioning cap 22 and the second gear ring 102 (i.e., the attached Figure 4 Insert a simple auxiliary insert into the gap position at A in the middle to lock the coil spring and the ruler core disk; at this time, insert the end of the shaft of the ruler core disk with the coil spring installed into the first delay 101 of the first housing 11 (that is, the attached Figure 4 After the coil spring is locked (at position B in the middle), the auxiliary insert can be removed. The coil spring is still in a locked state, and the entire ruler core disk 3 has been installed, avoiding the use of special tools. The whole process ensures that the coil spring is locked, greatly improving safety, and the structure is simple and easy to install.

[0031] The ruler core disk 3 includes a removable cover 31 that covers the open end of the coil spring slot 30, facilitating the insertion of the coil spring into the slot. Specifically, the cover 31 includes multiple locking slots 32 evenly spaced around its circumference. Locking claws 33 are provided at corresponding positions on the open end of the coil spring slot 30. The locking claws 33 cooperate with the locking slots 32 to secure the cover 31.

[0032] Among them, positioning protrusions 34 are distributed between the buckle grooves 32, and a positioning groove 35 that cooperates with the positioning protrusion 34 is provided at a corresponding position of the open end of the coil spring groove 30, so that the cover can be positioned when installed.

[0033] The ruler core disk 3 includes two limiting walls 36 forming a space for winding the ruler tape, and a hole 37 is hollowed out on the limiting walls 36 .

[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 self-retracting measuring tape, characterized in that: include: A main housing (1), the main housing (1) comprising a first housing (11) and a second housing (12) fixed to each other, a rotating shaft (2) fixed in the main housing (1), and a strip-shaped through hole (20) provided on the rotating shaft (2); A ruler core disk (3), the ruler core disk (3) is arranged in the main housing (1) and is rotatably supported by the rotating shaft (2), the ruler core disk (3) includes a coil spring groove (30) for accommodating a coil spring, a coil spring is arranged in the coil spring groove (30), one end of the coil spring is fixed to the strip through hole (20), and the other end is fixed to the ruler core disk (3); A ruler tape (4) is wound on the ruler core disk (3), with one end of the ruler tape being fixed to the ruler core disk (3) and the other end passing through a ruler tape through-hole of the main housing (1); a ruler hook (5) is fixed to the end of the ruler tape passing through the ruler tape through-hole.

2. The self-retracting measuring tape according to claim 1, characterized in that: The ruler core disk (3) comprises a detachable cover (31) provided on the ruler core disk, and the cover (31) covers the open end of the coil spring slot (30).

3. The self-retracting measuring tape according to claim 2, wherein: The cover (31) includes a plurality of buckle grooves (32) uniformly distributed at circumferential intervals. A buckle claw (33) is provided at a corresponding position on the open end of the coil spring groove (30). The buckle claw (33) cooperates with the buckle groove (32) to fix the cover (31).

4. The self-retracting measuring tape according to claim 3, wherein: Positioning protrusions (34) are distributed between the buckle grooves (32), and a positioning groove (35) cooperating with the positioning protrusion (34) is provided at a corresponding position of the open end of the coil spring groove (30).

5. The self-retracting measuring tape according to claim 1, wherein: The ruler core disk (3) comprises two limiting walls (36) forming a space for winding the ruler tape, and a hole (37) is hollowed out on the limiting walls (36).

6. The self-retracting measuring tape according to claim 1, characterized in that: The rotating shaft (2) comprises a shaft portion (21) and positioning caps (22) fixed at both ends of the shaft portion (21); the positioning cap (22) comprises a disc and a raised portion with a tooth portion protruding from the middle of the disc; a limiting groove (100) having a shape matching the raised portion is provided at a position facing the first shell (11) and the second shell (12) and the raised portion; a first tooth ring (101) matching the raised portion is provided in the limiting groove of the first shell (11); and a second tooth ring (102) is provided on the cover component.

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