Automatic compensation structure for self-locking steel tape measure

Abstract

An automatic compensation structure for a self-locking steel tape measure, characterized in that: the structure includes a slider (2) arranged at the exit position of the self-locking steel tape measure housing (1), and a slide groove (3) located at the exit position of the self-locking steel tape measure housing (1) and slidingly engaged with the slider (2); the slider (2) includes a first surface (2.1) in contact with the tape and a second surface (2.2) in contact with the slide groove (3); when the tape (a) of the self-locking steel tape measure is drawn out or retracted, the first surface (2.1) drives the slider (2) to move forward and backward relative to the slide groove (3). The present application has the advantages of increasing the automatic compensation function, reducing friction damage to the friction parts, and effectively extending the service life of the self-locking steel tape measure.

Description

Technical Field

[0001] The present application relates to the technical field of measuring tools, and in particular to an automatic compensation structure for a self-locking steel tape measure. Background Art

[0002] The steel tape measure is a commonly used measuring tool for surveying and mapping. Since the steel tape is very thin and has an elastic tension structure, after being pulled to a certain length, in order to maintain a fixed length and prevent the tape from injuring the operator (avoiding bouncing and injuring the hand), the existing technology uses a steel tape measure with a self-locking function. This self-locking function is achieved by setting a friction part to frictionally press the tape. This single friction part locks the tape movement to achieve a self-locking effect. During the process of pulling out and retracting the tape, the friction part will always be in contact with the tape, and the wear frequency is high and the wear is relatively serious. When the wear exceeds the pre-load height and cannot generate sufficiently large friction resistance with the tape, the self-locking ability of the steel tape measure will fail. Once the self-locking ability fails, it will not only affect the measurement and positioning of the tape, but may also cause the tape to shrink rapidly and cause certain injuries to the operator. Summary of the Invention

[0003] In response to the above-mentioned deficiencies in the prior art, the present application provides an automatic compensation structure for a self-locking steel tape measure that can add an automatic compensation function, cause less friction damage to friction parts, and effectively extend the service life.

[0004] In order to solve the above technical problems, the technical solution adopted in this application is: an automatic compensation structure for a self-locking steel tape measure, which structure includes a slider arranged at the outlet of the self-locking steel tape measure shell, and a slide groove located at the outlet of the self-locking steel tape measure shell and slidingly engaged with the slider; the slider includes a first surface in contact with the tape and a second surface in contact with the slide groove. During the process of pulling out or retracting the tape of the self-locking steel tape measure, the first surface drives the slider to move back and forth relative to the slide groove.

[0005] Preferably, the slider is gradually tilted downward along the chute from the end closest to the self-locking steel tape measure housing to the end away from the self-locking steel tape measure housing. This structure enables the slider to move not only along the outlet direction but also along the outlet in the vertical direction as the tape moves outward or inward from the outlet, thereby achieving air avoidance or friction compensation.

[0006] When the user retracts the tape, the tape will drive the slider to slide toward the inside of the opening, and the slider will gradually increase in the direction of the inclination, thereby increasing the pre-load height between the friction member and the tape, thereby providing compensation for the friction force. During the entire use process, the slider can automatically change the pre-load height of the friction part and the tape, which can not only reduce the friction between the tape and the friction part, but also greatly increase the service life of the steel tape measure. In addition, the compensation of the slider can also reduce the damage to the friction part, thereby effectively ensuring the self-locking effect.

[0007] Preferably, the first surface is an arc-shaped surface, and the curvature of the arc-shaped surface is adapted to the curvature of the lower surface of the tape; the above structure can ensure sufficient contact between the slider and the tape, thereby providing a guarantee for the stable forward and backward movement of the slider.

[0008] Furthermore, blocks are provided on both sides of the first surface, and the blocks are used to limit the distance that the slider slides back and forth relative to the slide groove and prevent the slider from being separated from the slide groove, and the length of the block along the sliding direction of the slider is less than the length of the first surface extension; adopting this structure, it can not only ensure that the slider moves back and forth under the drive of the tape, but also limit the moving position and prevent the slider from being separated from the slide groove.

[0009] Preferably, the second surface is provided with an inwardly concave slide rail groove, and the corresponding slide groove is provided with a slide rail. The slide rail groove is slidably fitted on the slide rail and can move back and forth along the slide rail. The above structure is simple, easy to match, and slides steadily and smoothly.

[0010] Preferably, there are two slide rail grooves, which are arranged near both sides of the slider, and the depth of the slide rail groove gradually increases from the end close to the self-locking steel tape measure housing to the end away from the self-locking steel tape measure housing; with the above structure, the two slide rail grooves can drive the slider to move back and forth more smoothly. In addition, by setting the slide rail groove into an inclined structure, space is provided for avoiding air between the friction part and the tape.

[0011] Preferably, the slide groove includes a slide groove surface that cooperates with the second surface, and two slide rails that slide into the two slide rail grooves are provided on the slide groove surface, and the slide groove surface is gradually inclined downward from the end close to the self-locking steel tape measure housing to the end away from the self-locking steel tape measure housing; the above structure is adopted to provide support for the sliding of the slider, and at the same time, it can also effectively provide a guarantee for the avoidance of air between the friction part and the tape, thereby avoiding excessive friction of the friction part.

[0012] Preferably, the self-locking steel tape measure housing includes a first shell and a second shell, and the first shell and the second shell are mutually locked to form a complete self-locking steel tape measure housing, and the slider is an integrated slider fitted on the slide groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of the self-locking steel tape measure housing (slider not installed).

[0014] Figure 2 Schematic diagram of the first shell structure of the self-locking steel tape measure housing (the slider is visible).

[0015] Figure 3 Schematic diagram of the second shell structure of the self-locking steel tape measure housing (the slider is visible).

[0016] Figure 4 Schematic diagram of the first shell structure of the self-locking steel tape measure shell (slider not installed).

[0017] Figure 5 Schematic diagram of the second shell structure of the self-locking steel tape measure shell (slider not installed).

[0018] Figure 6 Schematic diagram of the slider structure of the present application (the first surface is visible).

[0019] Figure 7 Schematic diagram of the slider structure of the present application (the second surface is visible).

[0020] Figure 8 Schematic diagram of the self-locking steel tape measure housing structure with the slider in the exit position.

[0021] Figure 9 Schematic diagram of the self-locking steel tape measure housing structure with the slider sliding out of the exit position.

[0022] Figure 10 Schematic diagram of the structure of a self-locking steel tape measure equipped with a spring clip, a measuring tape and a friction piece.

[0023] As shown in the attached figure: a. tape, b. spring piece, c. friction part, 1. self-locking steel tape measure housing, 1.1. first housing, 1.2. second housing, 2. slider, 2.1. first surface, 2.2. second surface, 2.3 stopper, 2.4. slide rail groove, 3. slide groove, 3.1. slide rail, 3.2. slide groove surface. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only preferred embodiments, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this invention.

[0025] It should also be noted that when a component is referred to as being "fixed to" (and other similar terms implied by "fixed to") another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" (and other similar terms implied by "connected to") another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "disposed on" (and other similar terms implied by "disposed on") another component, it may be directly disposed on the other component or there may be another intermediate component at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" used herein includes any and all combinations of one or more of the relevant listed items.

[0026] As attached Figure 1-9As shown, the technical solution adopted in the present application is: an automatic compensation structure for a self-locking steel tape measure, which includes a slider 2 arranged at the exit position of the self-locking steel tape measure housing 1 (that is, the exit position on the self-locking steel tape measure housing for the tape inside the tape measure, that is, the measuring steel ruler, to enter and exit), and a slide groove 3 located at the exit position of the self-locking steel tape measure housing 1 for slidingly fitting with the slider 2; the slider 2 includes a first surface 2.1 in contact with the tape and a second surface 2.2 in contact with the slide groove 3 (the first surface and the second surface are arranged oppositely, one is located at the upper part and the other is located at the lower part), and during the process of pulling out or retracting the tape a of the self-locking steel tape measure (that is, the tape of the tape measure or the measuring ruler inside the tape measure), the first surface 2.1 drives the slider 2 relative to the slide groove 3 moves forward and backward (the forward and backward here refers to the forward and backward direction of the tape in and out of the exit position) to adjust the pre-stress height of the friction member c and the tape a; the slider 2 gradually tilts downward along the slide groove 3 from the end close to the self-locking steel tape housing to the end away from the self-locking steel tape housing (that is, in the process of the slider sliding from the exit position to the outside along the slide groove, not only the front and rear positions change, but also the upper and lower height positions are displaced downward, thereby reducing the pre-stress height between the friction member and the tape, so that the friction member and the tape are separated or not tightly combined, reducing the friction between the two; similarly, the process of being brought back to the exit in the opposite direction will increase the pre-stress height between the friction member and the tape, compensate for the friction force, and reduce the wear and damage to the friction member).

[0027] The above-mentioned slide groove of this embodiment is a structure that can slide with the slider formed by the self-locking steel tape measure shell at the outlet position of the tape; the slider of this application is required to be able to automatically change the pre-compression height of the friction part (the structure used for self-locking) and the tape during the process of moving forward or backward along the outlet of the tape (that is, to adjust the distance or the clamping force between the tape and the friction part, compensate for the friction force when self-locking, and make the tape lock more firmly, avoid excessive friction between the tape and the friction part when loose, and minimize the friction between the tape and the friction part), thereby greatly increasing the service life of the steel tape measure.

[0028] As attached Figure 6 As shown, the first surface 2.1 described in the present application is an arc-shaped surface, and the curvature of the arc-shaped surface is adapted to the curvature of the lower surface of the tape (that is, the cross-section of the tape is an arc-shaped surface. In order to ensure a more stable fit between the tape and the slider, the first surface is also provided with an arc-shaped structure adapted to or matched with the arc of the outer contour of the tape); the above structure can ensure sufficient contact between the slider and the tape, providing a guarantee for driving the slider to move back and forth stably.

[0029] As attached Figure 6-7As shown, the first surface 2.1 described in the present application is provided with stoppers 2.3 on both sides, and the stoppers 2.3 are used to limit the distance that the slider 2 slides back and forth relative to the slide groove 3 and prevent the slider 2 from being separated from the slide groove 3, and the length of the stoppers 2.3 along the sliding direction of the slider 2 is less than the length of the first surface 2.1. Specifically, from the attached Figure 6-7 It can be seen that the stopper 2.3 is set on the left and right sides of the slider, and the starting end of the stopper is consistent with the starting end of one end of the slider, and the extension end of the other end is shorter than the extension end of the slider, and the height of the stopper 2.3 is higher than the height of the slider (the slider and the stopper can be integrally formed to form an integral structure); as shown in the attached Figure 4-5 As shown, corresponding front and rear protrusions for abutting the front and rear ends of the block are provided at the corresponding positions of the shell of the tape measure, that is, on both sides of the slide 3. One of the two protrusions is provided on the inner wall at the outlet position of the shell for abutting against the front end of the block, and the other is provided at the rear end for abutting against the rear end of the block. The distance between the two protrusions is the displacement range that the slider can move forward and backward. With this structure, it can be ensured that the slider moves forward and backward under the drive of the tape, and the moving position can be limited, and the slider can be prevented from being separated from the slide.

[0030] As attached Figure 1 、 4 -5 and 7, the second surface 2.2 described in the present application is provided with an inwardly concave slide groove 2.4, and the corresponding slide groove 3 is provided with a slide rail 3.1. The slide rail groove 2.4 is slidably fitted on the slide rail 3.1 and can move back and forth along the slide rail 3.1 (that is, it slides back and forth along the in and out direction of the tape); the above structure is simple, easy to match, and slides steadily and smoothly.

[0031] As attached Figure 7 As shown, the slide rail grooves 2.4 described in the present application are provided with two, which are respectively arranged near the two sides of the slider 2 (i.e., on both sides in the width direction of the slider, i.e., on both sides in the direction perpendicular to the running direction of the tape), and the depth of the slide rail groove 2.4 gradually increases from the end close to the self-locking steel tape measure shell to the end away from the self-locking steel tape measure shell (i.e., the depth of the slide rail groove is not uniform, but gradually deepens along the discharge direction of the tape); with the above structure, the two slide rail grooves can drive the slider to move back and forth more smoothly. In addition, by setting the slide rail groove to an inclined structure, space is provided for avoiding air between the friction part and the tape.

[0032] As attached Figure 1 、 4-5, the slide groove 3 includes a slide groove surface 3.2 that cooperates with the second surface 2.2, and two slide rails 3.1 that are slidably fitted with the two slide rail grooves 2.4 are provided on the slide groove surface 3.2, and the slide groove surface 3.1 is gradually inclined downward from the end close to the self-locking steel tape measure shell 1 to the end away from the self-locking steel tape measure shell 1; that is, the slide groove surface is also provided with an inclined surface that is inclined downward from the direction of tape withdrawal, and cooperates with the slide rail groove that is inclinedly set with the slider; the above structure is adopted to provide support for the sliding of the slider, and at the same time, it can also effectively provide a guarantee for the friction part and the tape to avoid airflow, thereby avoiding excessive friction of the friction part and causing loss.

[0033] As attached Figure 2-5 As shown, the self-locking steel tape measure housing 1 described in the present application includes a first shell 1.1 and a second shell 1.2. The first shell 1.1 and the second shell 1.2 are mutually locked to form a complete self-locking steel tape measure housing, and the slider 2 is an integrated slider (i.e., integrally formed) that is fitted on the slide groove 3; specifically, the first shell and the second shell are first separated, and then the slider is fitted on the slide groove, and then the two shells are closed and tightened. The slider can slide back and forth in the complete slide groove formed after the first shell and the second shell are buckled together, and the pre-load height between the friction part and the tape can be freely and flexibly adjusted under the drive of the tape, thereby reducing the wear of the friction part by the tape, thereby achieving the purpose of prolonging the service life.

[0034] The working principle and action process of this product: When the user pulls out the tape a, the lower surface of the tape and the first surface of the slider are connected due to the spring piece b (as shown in the attached figure). Figure 10 As shown, the spring piece b here is the spring piece structure of the conventional existing self-locking tape measure, the purpose of which is to adjust the friction between the friction member c and the tape or the pressure between the friction member and the tape to achieve the effect of self-locking and loosening the tape. Specifically, in this embodiment, it can be a V-shaped spring piece structure with elastic deformation function, which is horizontally arranged in the shell above the outlet of the tape measure and has an acting force and abutment with the friction member. The pressing force on the friction member is adjusted by opening and closing the open end of the V-shape, which will not be repeated here. The elastic force of each other squeezes the tape measure, and the slider starts from the initial position where it does not protrude from the outlet (such as Figure 8 As shown), slide outwards a certain distance from the exit (as shown Figure 9As shown in the figure, because the slideway surface of the slide is an inclined surface and the slideway groove of the slider is also an inclined groove, the forward stroke causes the slider to move downward for a certain distance, thus creating a certain vertical clearance between the slider and the friction member. At this time, there is also clearance between the tape and the friction member (no contact or incomplete contact), which reduces the friction between the two. When the user retracts the tape, the tape drives the slider to slide backward, and the slider is lifted upward, increasing the preload height between the friction member and the tape, providing compensation for the friction force. Throughout the use process, the slider can automatically change the preload height between the friction member and the tape, achieving compensation for the friction member's force, reducing the wear of the friction member itself, and thus greatly extending the service life of the steel tape measure.

[0035] The setting of the above-mentioned slider in the present application does not require a complex structure, nor does it require too much improvement or adjustment to the structure of the original self-locking steel tape measure. Instead, it is sufficient to set a slide groove at the exit position of the self-locking steel tape measure shell and slide with the slider. The structure is simple and easy to operate. The slider does not need to have a complex connection relationship or positional relationship with the structure of the original self-locking steel tape measure. Driven by the tape, it can move back and forth with the slide groove, so that the slider can automatically change the pre-load height of the friction part and the tape. The setting of this simple slider structure can greatly increase the service life of the steel tape measure. In addition, even if a certain degree of wear occurs in the slider structure set in the present application, the loss can be compensated by adjusting the forward and backward displacement of the slider. Therefore, the slider can still achieve the effect of automatically changing the pre-load height of the friction part and the tape, and can still provide compensation for the friction force of the friction part and reduce the loss of the friction part, so that the self-locking ability of the friction part to the tape remains stable.

Claims

1. An automatic compensation structure for a self-locking steel tape measure, characterized by: The structure comprises a slider (2) arranged at the exit position of the self-locking steel tape measure housing (1), and a slide groove (3) located at the exit position of the self-locking steel tape measure housing (1) and slidingly fitted with the slider (2); the slider (2) comprises a first surface (2.1) in contact with the tape and a second surface (2.2) in contact with the slide groove (3); during the process of extracting or retracting the tape (a) of the self-locking steel tape measure, the first surface (2.1) drives the slider (2) to move forward and backward relative to the slide groove (3); the slider (2) gradually tilts downward along the slide groove (3) from the end close to the self-locking steel tape measure housing (1) to the end away from the self-locking steel tape measure housing (1).

2. The automatic compensation structure for a self-locking steel tape measure according to claim 1, characterized in that: The first surface (2.1) is an arc-shaped surface, and the curvature of the arc-shaped surface is adapted to the curvature of the lower surface of the tape.

3. The automatic compensation structure for a self-locking steel tape measure according to claim 1, characterized in that: Stoppers (2.3) are provided on both sides of the first surface (2.1), and the stoppers (2.3) are used to limit the distance that the slider (2) slides forward and backward relative to the slide groove (3) and to prevent the slider (2) from being separated from the slide groove (3), and the length of the stoppers (2.3) along the sliding direction of the slider (2) is less than the extended length of the first surface (2.1).

4. The automatic compensation structure for a self-locking steel tape measure according to claim 1, characterized in that: The second surface (2.2) is provided with an inwardly concave slide rail groove (2.4), and the corresponding slide rail (3) is provided with a slide rail (3.1). The slide rail groove (2.4) is slidably fitted on the slide rail (3.1) and can move forward and backward along the slide rail (3.1).

5. The automatic compensation structure for a self-locking steel tape measure according to claim 4, characterized in that: The slide rail grooves (2.4) are provided in two pieces and are respectively provided near both sides of the slider (2), and the depth of the slide rail grooves (2.4) gradually increases from the end close to the self-locking steel tape measure housing (1) to the end away from the self-locking steel tape measure housing (1).

6. The automatic compensation structure for a self-locking steel tape measure according to claim 1, characterized in that: The slide groove (3) includes a slide groove surface (3.2) that cooperates with the second surface (2.2), and two slide rails (3.1) that are slidably fitted with the two slide rail grooves (2.4) are provided on the slide groove surface (3.2), and the slide groove surface (3.2) is gradually inclined downward from the end close to the self-locking steel tape measure housing (1) to the end away from the self-locking steel tape measure housing (1).

7. The automatic compensation structure for a self-locking steel tape measure according to claim 1, characterized in that: The self-locking steel tape measure housing (1) comprises a first housing (1.1) and a second housing (1.2), wherein the first housing (1.1) and the second housing (1.2) are mutually locked to form a complete self-locking steel tape measure housing (1), and the slider (2) is an integrated slider fitted on a slide groove (3).

Images