Tape measure with hand guard

Abstract

This invention discloses a measuring tape that prevents the tape from cutting the hand. As a measuring tool, existing anti-cut measuring tapes are complex in structure and operation, and expensive. This invention includes a housing, a reel, a tape, a hook assembly, an elastic element, and a protective sleeve. The hook assembly is connected to the outer end of the tape via rivets to form a hook-tape rivet assembly. The protective sleeve includes a locking device, an anti-detachment protrusion, and a sleeve body. The protective sleeve is installed inside the housing's outlet hole and is movably connected to it. The protective sleeve is locked to the hook-tape rivet assembly. When the anti-detachment protrusion slides to the housing's outlet hole, the protective sleeve stops at the outlet hole, creating a safe distance between the hand and the tape, effectively preventing hand cuts.

Description

Technical Field

[0001] This invention relates to the field of measuring tools, and in particular to a measuring tape that prevents the tape from cutting the fingers when using it. Background Technology

[0002] Measuring tapes are widely used measuring tools in daily life. Their tapes are typically made of a flexible metal or non-metal material. When not in use, the tape is wound inside the casing to keep it neat and easy to carry. When measuring, the user attaches one end of the tape to the object being measured and pulls the tape out of the casing to measure its length.

[0003] However, existing measuring tapes pose safety hazards when extending or retracting the tape. Specifically, when the tape is rapidly retracted into or extended from the housing, due to its elasticity and the hardness of the metallic or non-metallic materials, the edge of the tape may glide across the operator's hand at a relatively high speed, or the hook component may snap against the operator's hand during rapid movement, posing a risk of cuts or splintering injuries. This safety hazard not only causes psychological stress for the operator but may also result in direct injury.

[0004] Although some patented solutions for cut-resistant measuring tapes exist, such as patent CN209181654U, most remain theoretical due to complex structures and operations, high costs, complex assembly processes, and other reasons. Few practical products have been launched and widely adopted, making them unsuitable for large-scale market deployment and production. Therefore, developing a cut-resistant measuring tape that is highly safe, environmentally friendly, economical, and easy to use is crucial for solving these problems. Summary of the Invention

[0005] The purpose of this invention is to provide a novel tape measure that prevents the tape from cutting hands. It aims to overcome the shortcomings of the prior art and provide a highly safe and easy-to-operate solution for preventing cuts with a tape measure, effectively improving the safety of tape measure use, while also making it convenient for users, increasing measurement efficiency, and reducing costs.

[0006] To achieve the above objectives, the measuring tape of the present invention for preventing hand cuts includes:

[0007] The housing has a housing outlet hole;

[0008] A reel, which is rotatably mounted within the housing;

[0009] A measuring tape is wound around the reel and is configured to switch between a retracted state and a usage state. In the retracted state, the measuring tape is wound into the housing, and in the usage state, the measuring tape extends out of the housing through an outlet hole in the housing.

[0010] A hook assembly, wherein the hook assembly is connected to the outer end of the ruler belt by a rivet to form a hook belt rivet assembly;

[0011] A protective sleeve, which is movably mounted at the outlet hole of the housing and constrained to the housing, includes a locking device;

[0012] During the process of retracting the measuring tape into the housing to change it from a used state to a stored state, the hook-and-tape rivet assembly engages with the locking device to form a locking connector, connecting the protective sleeve to the hook-and-tape rivet assembly. The protective sleeve is drawn into the housing by the locking connector. During the process of extending the measuring tape out of the housing to change it from a stored state to a used state, the protective sleeve is drawn out of the housing outlet hole by the locking connector and is restrained and retained at the housing outlet hole to provide protection. The engagement between the hook-and-tape rivet assembly and the locking device disengages, allowing the measuring tape to extend freely.

[0013] In some embodiments, the hook and rivet assembly is provided with a first engaging structure, which is one of the following: a convex part of protective sleeve I, a convex part of protective sleeve II, a convex part of protective sleeve III, a concave part of protective sleeve I, a hole hook of protective sleeve, a side hook of protective sleeve, or a convex part of protective sleeve IV, a convex part of protective sleeve V, and a concave part of protective sleeve II.

[0014] The locking device is provided with a second locking structure, which is one of the following: rivet upper protrusion, rivet lower protrusion, ruler hook I recess, ruler hook II protrusion, ruler hook hole, ruler hook edge, ruler belt head edge, ruler hook recess, and ruler hook III protrusion.

[0015] The hook-and-rivet assembly engages with the engaging device by a first engaging structure and a second engaging structure, and the first engaging structure and the second engaging structure engage in any of the following ways:

[0016] The protrusion of the protective sleeve I engages with the protrusion on the rivet;

[0017] The protruding part of the protective sleeve II engages with the lower protruding part of the rivet;

[0018] The protrusion of the protective sleeve III engages with the concave part of the ruler hook I;

[0019] The concave part of the protective sleeve I engages with the convex part of the ruler hook II;

[0020] The protective sleeve hook engages with the ruler hook hole;

[0021] The protective sleeve hook and the ruler hook are engaged and connected.

[0022] The protrusion of the protective sleeve IV engages with the edge of the hook tape head;

[0023] The protective sleeve V protrusion engages with the ruler hook recess.

[0024] The concave part of the protective sleeve II engages with the convex part of the ruler hook III.

[0025] In some embodiments, the protective sleeve is configured in at least one of the following sizes:

[0026] (1) The diameter of the outlet hole of the shell is 0.1mm-8mm larger than the outer diameter of the protective sleeve;

[0027] (2) The inner diameter of the protective sleeve is 0.1mm-8mm larger than the diameter of the arc surface of the tape;

[0028] (3) The thickness of the protective sleeve is 0.2mm-3mm.

[0029] In some embodiments, the side of the protective sleeve corresponding to the scale markings is made transparent or at least partially open.

[0030] In some embodiments, the protective sleeve is provided with an anti-detachment protrusion, and the housing is provided with a housing anti-detachment part. The anti-detachment protrusion is configured to move along the positioning mechanism toward the housing outlet hole. When the anti-detachment protrusion contacts the housing anti-detachment part, the protective sleeve can rotate at least 5 degrees around the anti-detachment protrusion as a pivot. The rotation of the protective sleeve prevents the tape from winding up and positions the tape at the desired length.

[0031] In some embodiments, the protective sleeve is blocked by at least one of the following blocking methods:

[0032] In the first blocking method, the protective sleeve is provided with an anti-detachment protrusion, and a shell blocking mechanism is provided inside the shell. The shell blocking mechanism cooperates with the anti-detachment protrusion. When the protective sleeve is completely retracted into the shell, the shell blocking mechanism will effectively block the anti-detachment protrusion.

[0033] Method 2: The protective sleeve is equipped with a protective sleeve blocking mechanism, which cooperates with the shell outlet hole. When the protective sleeve enters the deepest part of the shell, the shell outlet hole will block the protective sleeve blocking mechanism.

[0034] In some embodiments, the housing is provided with a positioning mechanism, and the protective sleeve is provided with an anti-detachment protrusion that slides within a range guided and defined by the positioning mechanism.

[0035] In some embodiments, an anti-retraction structure is provided between the housing and the protective sleeve, and the anti-retraction structure is at least one of the following anti-retraction structures:

[0036] In the first anti-retraction structure, the positioning mechanism includes a housing anti-retraction mechanism that cooperates with the anti-detachment protrusion. When the protective sleeve moves outward to the housing outlet hole, the anti-detachment protrusion enters the housing anti-retraction mechanism. When the tape rewinds inward, the resistance force generated by the anti-detachment protrusion entering the housing anti-retraction mechanism is greater than the frictional force generated between the tape rewinding and the protective sleeve, thus stopping the protective sleeve at the housing outlet hole. Furthermore, the resistance force generated by the anti-detachment protrusion entering the housing anti-retraction mechanism is less than the impact force generated between the hook and rivet assembly and the protective sleeve during tape rewinding. After the protective sleeve and the hook and rivet assembly are reconnected, the sleeve smoothly retracts into the housing.

[0037] The second anti-retraction structure includes an outlet hole protrusion in the housing and an anti-retraction protrusion in the protective sleeve. The outlet hole protrusion and the anti-retraction protrusion of the protective sleeve cooperate with each other. When the protective sleeve moves outward to the housing outlet hole, the anti-retraction protrusion of the protective sleeve slides past the outlet hole protrusion. When the tape is wound up, the blocking force of the outlet hole protrusion on the anti-retraction protrusion of the protective sleeve is greater than the frictional force generated between the tape and the protective sleeve during tape winding, thus stopping the protective sleeve at the housing outlet hole and providing protection. The blocking force generated by the anti-detachment protrusion entering the housing anti-retraction mechanism is less than the impact force generated between the hook and rivet assembly and the protective sleeve during tape winding. After the protective sleeve and the hook and rivet assembly are reconnected, the protective sleeve smoothly retracts into the housing.

[0038] In some embodiments, the protective sleeve has a notch, and the opening of the notch faces upward.

[0039] In some embodiments, the protective sleeve is provided with a ruler hook groove, which allows the protruding part of the rivet to enter the protective sleeve without obstruction.

[0040] In some embodiments, the measuring tape also includes an elastic element that can be configured to apply elastic force to the reel for winding or coiling the tape by the reel.

[0041] Other features and advantages of the present invention will be described in detail in the specific embodiments, and some of these features and advantages will be obvious and apparent to those skilled in the art from the description, or will be recognized by practicing the embodiments as described in the written description, claims, and drawings of the present invention. It should be understood that the above summary description and the following detailed description are illustrative.

[0042] This invention includes accompanying drawings to provide a further understanding; the drawings are included in and form part of this specification. The drawings, together with the description, serve to illustrate the principles and operation of various embodiments. Attached Figure Description

[0043] Figure 1This is a schematic diagram of the tape measure of the present invention in the extended state to prevent the tape from cutting the hand.

[0044] Figure 2 This is a schematic diagram of the tape measure of the present invention in the wound state to prevent the tape from cutting the hand.

[0045] Figure 3 This is a cross-sectional schematic diagram of the engagement connection between the protrusion of the protective sleeve I and the protrusion on the rivet of the present invention;

[0046] Figure 4 This is a cross-sectional schematic diagram of the engagement connection between the protrusion of the protective sleeve II and the lower protrusion of the rivet according to another exemplary embodiment of the present invention;

[0047] Figure 5 This is a cross-sectional schematic diagram of the engagement connection between the protrusion of the protective sleeve III and the protrusion of the ruler hook I according to another exemplary embodiment of the present invention;

[0048] Figure 6 This is a cross-sectional schematic diagram of the engagement connection between the recess of the protective sleeve I and the protrusion of the ruler hook II according to another exemplary embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the engagement connection between the protective sleeve hole hook and the ruler hook hole according to another exemplary embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the protective sleeve hook and the ruler hook engaging connection according to another exemplary embodiment of the present invention;

[0051] Figure 9 This is a cross-sectional schematic diagram of the protective sleeve IV protrusion and the hook ruler head edge engaging connection according to another exemplary embodiment of the present invention;

[0052] Figure 10 This is a cross-sectional schematic diagram of the engagement connection between the protrusion of the protective sleeve V and the recess of the ruler hook according to another exemplary embodiment of the present invention.

[0053] Figure 11 This is a schematic diagram of the engagement connection between the recess of the protective sleeve II and the protrusion of the ruler hook III according to another exemplary embodiment of the present invention;

[0054] Figure 12 This is a schematic diagram of the outlet orifice diameter of the housing of the present invention;

[0055] Figure 13 This is a schematic diagram of the inner diameter of the protective sleeve of the present invention;

[0056] Figure 14 This is a schematic diagram of the protective sleeve wall thickness of the present invention;

[0057] Figure 15This is a schematic diagram of the rotation angle of the protective sleeve of the present invention;

[0058] Figure 16 A cross-sectional schematic diagram of a blocking method between the housing and the protective sleeve of the present invention;

[0059] Figure 17 This is a cross-sectional schematic diagram of another blocking method between the housing and the protective sleeve according to another exemplary embodiment of the present invention;

[0060] Figure 18 This is a schematic diagram of the housing positioning mechanism of the present invention;

[0061] Figure 19 This is a schematic diagram of a method for preventing the shell and protective sleeve from collapsing according to the present invention;

[0062] Figure 20 This is a schematic diagram of another anti-retraction method of the housing and protective sleeve according to another exemplary embodiment of the present invention;

[0063] Figure 21 This is a schematic cross-sectional view of the notch in the protective sleeve of the present invention;

[0064] Figure 22 This is a cross-sectional schematic diagram of the ruler hook groove of the protective sleeve of the present invention;

[0065] Figure 23 This is a cross-sectional schematic diagram of the hook and strap rivet assembly of the present invention;

[0066] Figure 24 This is a cross-sectional schematic diagram of the protective sleeve of the present invention;

[0067] Figure 25 This is a schematic diagram of the protective sleeve of the present invention;

[0068] Figure 26 This is a schematic diagram illustrating how the protective sleeve prevents itself from detaching from the housing when the anti-detachment part of the housing comes into contact with the anti-detachment protrusion. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0070] The terms “comprising” and “having”, and any variations thereof, used in the specification and claims of this invention are intended to cover a non-exclusive inclusion, such as a method or product that includes a series of technical features, not necessarily limited to those technical features explicitly listed, but may also include other technical features that may be included in the method or product but not explicitly listed.

[0071] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings.

[0072] Reference Figures 1 to 2 This illustration shows a measuring tape with a sliding protective sleeve to prevent the tape from cutting hands, according to an exemplary embodiment. Its structure includes: a housing 1, a reel 2, a tape 3, a hook assembly 4, an elastic element 5, and a protective sleeve 6.

[0073] The housing 1 has a housing outlet hole 11, a housing anti-detachment part 12, a shaft 13, and a positioning mechanism 14. The reel 2 is rotatably mounted inside the housing 1 around the shaft 13. The measuring tape 3 is wound around the reel 2. The hook assembly 4 is connected to the outer end of the measuring tape 3 by rivets to form a hook and tape riveting assembly 41. Figure 23 The structure of various parts of the hook and strap riveting assembly 41 is shown. The elastic element 5 is a planar spiral spring, which is at least partially positioned within the inner reel cavity, and the elastic element 5 is at least partially surrounded by the tape 3 in the radial direction. The elastic element 5 is connected between the reel 2 and the shaft 13 such that: when the tape 3 is unwound from the reel to extend from the housing 1, the elastic element 5 stores energy, and the elastic element 5, having released energy, drives the tape 3 to rewind onto the reel.

[0074] The protective sleeve 6 includes: a locking device 61, an anti-detachment protrusion 62, and a sleeve body 63. The protective sleeve 6 is installed inside the housing outlet hole 11 and is movably connected to the housing outlet hole 11. Figure 24 The structure of each part of the protective sleeve 6 is shown. Preferably, the outer diameter of the protective sleeve 6 is smaller than the diameter 111 of the outlet hole 11 of the shell, preferably by 1 mm. The inner diameter 699 of the protective sleeve 6 is larger than the arc surface diameter 300 of the scale 3, preferably by 1 mm. Figure 25 The inner and outer diameters of the protective sleeve 6 are shown.

[0075] In the initial state (stored state), the measuring tape 3 is fully wound onto the reel 2, and the protective sleeve 6 is installed inside the housing outlet hole 11. When measurement is needed, the user pulls the hook assembly 4, causing the measuring tape 3 to extend out of the housing 1. During the extension of the measuring tape 3 out of the housing 1, the elastic element 5 stores energy; simultaneously, the hook assembly 41 and the engaging connection of the protective sleeve 6 separate from the housing 1. When the anti-detachment protrusion 62 contacts the anti-detachment part 12 of the housing, the engaging connection separates, and the protective sleeve 6 remains at the housing outlet hole 11, preventing the extended measuring tape 3 from cutting the user's fingers. Figure 26The diagram shows the state when the anti-detachment protrusion 62 contacts the housing anti-detachment part 12, the protective sleeve 6 is positioned at the housing outlet hole 11, and the tape 3 is extended (usage state). Accordingly, the tape 3 is configured to switch between a retracted state and a usage state. In the retracted state, the tape is wound into the housing, and in the usage state, the tape 3 extends out of the housing 1 through the housing outlet hole 11.

[0076] After the measurement is completed, the user releases the hook assembly 4, the elastic element 5 releases energy, and drives the tape 3 to rewind onto the reel 2.

[0077] Although the illustrated structure shows an embodiment where the tape is pulled outwards and the elastic element 5 stores energy to retract the tape into the housing, in other embodiments, the tape can be retracted into the housing by manually rotating the reel, with the elastic element configured to store energy to push the tape outwards when retracting it into the housing. Manually rotating the reel can be achieved by having a crank protruding from the housing on the reel. Furthermore, in another embodiment, the elastic element can be omitted; in this case, the tape is pulled outwards and retracted into the housing by manually rotating the reel.

[0078] The anti-retraction mechanism 141 of the housing positioning mechanism cooperates with the anti-detachment protrusion 62 of the protective sleeve 6 to prevent retraction, or the outlet hole protrusion 112 of the housing outlet hole 11 cooperates with the anti-retraction protrusion 68 of the protective sleeve to prevent retraction. This effectively prevents the protective sleeve from slipping back into the housing prematurely when the tape has only partially retracted, thus protecting the user's fingers. During the winding process, the hook-and-tape rivet assembly 41 contacts and engages with the locking device 61 of the protective sleeve 6 as the tape moves, connecting the protective sleeve 6 to the hook-and-tape rivet assembly 41. Subsequently, the entire engaging connection smoothly retracts into the housing 1 for convenient use next time. This design allows the protective sleeve 6 to be fully retracted into the housing 1 when not in use, resulting in a simple and aesthetically pleasing appearance and easy portability. When in use, the protective sleeve 6 can be fully extended out of the housing 1, increasing operational smoothness and enhancing the user experience.

[0079] Reference Figures 3 to 11 This illustrates the engaging connection between the protective sleeve 6 and the hook-and-loop rivet assembly 41 according to an exemplary embodiment. The hook-and-loop rivet assembly 41 has a first engaging structure, and the engaging device 61 has a second engaging structure. The engaging of the hook-and-loop rivet assembly 41 and the engaging device 61 is achieved by the engagement of the first engaging structure and the second engaging structure, and the first engaging structure and the second engaging structure engage in any of the following ways:

[0080] The protective sleeve I protrusion 611 engages with the rivet upper protrusion 411; the protective sleeve II protrusion 612 engages with the rivet lower protrusion 412; the protective sleeve III protrusion 613 engages with the ruler hook I recess 413; the protective sleeve I recess 614 engages with the ruler hook II protrusion 414; the protective sleeve hole hook 615 engages with the ruler hook hole 415; the protective sleeve edge hook 616 engages with the ruler hook edge 416; the protective sleeve IV protrusion 617 engages with the hook ruler tape head edge 417; the protective sleeve V protrusion 618 engages with the ruler hook recess 418; and the protective sleeve II recess 619 engages with the ruler hook III protrusion 419.

[0081] Reference Figure 3 The diagram shows the engagement of the protective sleeve I protrusion 611 with the rivet protrusion 411. When the hook assembly 4 is pulled outward, the protective sleeve I protrusion 611 of the protective sleeve 6 engages with the rivet protrusion 411 of the hook assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0082] Reference Figure 4 The diagram shows the engagement of the protective sleeve II protrusion 612 with the rivet lower protrusion 412. When the hook assembly 4 is pulled outward, the protective sleeve II protrusion 612 of the protective sleeve 6 engages with the rivet lower protrusion 412 of the hook rivet assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0083] Reference Figure 5 The diagram shows the engagement of the protective sleeve III protrusion 613 with the hook I recess 413. Its characteristic is that when the measuring tape is first used, and the hook assembly 4 is pulled outwards, the protective sleeve III protrusion 613 of the measuring tape protective sleeve 6 engages with the hook I recess 413 of the hook assembly 41. The hook assembly 4 then pulls the measuring tape protective sleeve 6 away from the interior of the housing 1, exposing the measuring tape protective sleeve 6 and thus protecting the fingers.

[0084] Reference Figure 6 The diagram shows the engagement of the recess 614 of the protective sleeve I with the protrusion 414 of the hook II. When the hand pulls the hook assembly 4 outward, the recess 614 of the protective sleeve I of the protective sleeve 6 engages with the protrusion 414 of the hook rivet assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0085] Reference Figure 7 The diagram shows the engagement of the protective sleeve hole hook 615 with the ruler hook hole 415. When the hand pulls the hook assembly 4 outward, the protective sleeve hole hook 615 of the protective sleeve 6 engages with the ruler hook hole 415 of the hook rivet assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0086] Reference Figure 8 The diagram shows the engagement of the protective sleeve edge hook 616 with the ruler hook edge 416. When the hand pulls the hook assembly 4 outward, the protective sleeve edge hook 616 of the protective sleeve 6 engages with the ruler hook edge 416 of the hook rivet assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0087] Reference Figure 9 The diagram shows the engagement of the protective sleeve IV protrusion 617 with the hook tape head edge 417. When the hand pulls the hook assembly 4 outward, the protective sleeve IV protrusion 617 of the protective sleeve 6 engages with the hook tape head edge 417 of the hook tape riveting assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0088] Reference Figure 10 The diagram shows the engagement of the protective sleeve V protrusion 618 with the ruler hook recess 418. When the hand pulls the hook assembly 4 outward, the protective sleeve V protrusion 618 of the protective sleeve 6 engages with the ruler hook recess 418 of the hook rivet assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0089] Reference Figure 11 The diagram shows the engagement of the recess 619 of the protective sleeve II with the protrusion 419 of the hook III. When the hand pulls the hook assembly 4 outward, the recess 619 of the protective sleeve II of the protective sleeve 6 engages with the protrusion 419 of the hook assembly 41, and the hook assembly 4 pulls the protective sleeve 6 away from the inside of the housing 1, exposing the protective sleeve 6 and protecting the fingers.

[0090] Reference Figure 12 The diagram shows that the diameter of the housing outlet hole 11 of the housing 1 is 0.1mm-8mm larger than the outer diameter 600 of the protective sleeve 6. This reduces the obstruction when the protective sleeve 6 enters and exits the housing outlet hole 11, increases the smoothness, and also reduces the friction between the protective sleeve 6 and the housing outlet hole 11, effectively improving the product's service life.

[0091] Reference Figure 13 This is a schematic diagram of the inner diameter 699 of the protective sleeve 6. The inner diameter 699 of the protective sleeve 6 is 0.1mm-8mm larger than the arc diameter 300 of the tape 3. This reduces the obstruction of the tape 3 in the protective sleeve 6, increasing its smoothness of passage, and also reduces the friction between the tape 3 and the protective sleeve 6, effectively improving the product's service life.

[0092] Reference Figure 14The diagram shows the wall thickness of the protective sleeve 6. The wall thickness D of the protective sleeve 6 ranges from 0.2mm to 3mm. Furthermore, the protective sleeve B side 69 corresponding to the scale markings on the scale 3 is transparent or at least partially open. This allows for clear, unobstructed observation and use of the digital scale function on the scale 3, and also enhances the product's aesthetics.

[0093] Reference Figure 15 This is a schematic diagram showing the rotation angle 'a' of the protective sleeve 6. The anti-detachment protrusion 62 of the protective sleeve moves along the positioning mechanism 14 towards the housing outlet hole 11. When the anti-detachment protrusion 62 contacts the housing anti-detachment part 12, the protective sleeve 6 can rotate around the anti-detachment protrusion 62 as a pivot. The rotation angle is greater than or equal to 5 degrees. Rotating the protective sleeve 6 towards the axis 13 by 5 degrees or more causes the measuring tape to bend and deform, and / or both sides of the measuring tape to contact the inner wall of the protective sleeve 6, generating static friction to prevent the measuring tape 3 from winding up and to stop the measuring tape 3 at the desired length position. When the measuring tape 3 leaves the protective sleeve 6, the angle of free rotation (or swing) of the protective sleeve 6 increases the smoothness of the stretching of the measuring tape 3. When the measuring tape 3 retracts but has not yet touched the protective sleeve 6, the angle of free rotation of the protective sleeve 6 helps the protective sleeve 6 to stop at the housing outlet hole 11, preventing the protective sleeve 6 from retracting into the housing 1 before the measuring tape 3, effectively increasing the safety factor.

[0094] Reference Figures 16-17 The diagram illustrates the blocking mechanism between the housing 1 and the protective sleeve 6. The fit between the housing 1 and the protective sleeve 6 is provided with a blocking mechanism, which is at least one of the following two options: Blocking mechanism one involves a housing blocking mechanism 142 inside the housing 1. Blocking mechanism two involves a protective sleeve blocking mechanism 67 on the protective sleeve 6.

[0095] Reference Figure 16 The diagram shows a housing blocking mechanism 142 inside the housing 1. This mechanism cooperates with the anti-detachment protrusion 62 on the protective sleeve 6. When the protective sleeve 6 is fully retracted into the housing 1, the housing blocking mechanism 142 will effectively hold the anti-detachment protrusion 62 in place, thereby preventing the protective sleeve 6 from accidentally falling into the housing 1 and ensuring smooth operation of the protective sleeve 6 for the next use.

[0096] Reference Figure 17 The diagram shows that the protective sleeve 6 is equipped with a protective sleeve blocking mechanism 67. In conjunction with the housing outlet hole 11 provided in the housing 1, when the protective sleeve 6 enters the deepest part of the housing 1, the housing outlet hole 11 will block the protective sleeve blocking mechanism 67 of the protective sleeve 6, preventing the protective sleeve 6 from falling into the housing 1 and affecting the next use.

[0097] Reference Figure 18The diagram shows an enlarged schematic of the positioning mechanism 14. The housing 1 is provided with the positioning mechanism 14, and the anti-detachment protrusion 62 slides within the range guided and limited by the positioning mechanism 14, which increases the smoothness and regularity of the protective sleeve 6 entering and exiting the housing 1, and also enhances the user experience.

[0098] Reference Figures 19-20 The diagram shows a schematic of the anti-retraction structure between the housing 1 and the protective sleeve 6. The anti-retraction structure between the housing 1 and the protective sleeve 6 is provided with at least one of the following two schemes: Anti-retraction structure one: the positioning mechanism 14 of the housing 1 is provided with a housing anti-retraction mechanism 141, which cooperates with the anti-detachment protrusion 62 provided on the protective sleeve 6; Anti-retraction structure two: the housing outlet hole 11 of the housing 1 is provided with an outlet hole protrusion 112, which cooperates with the protective sleeve anti-retraction protrusion 68 provided on the protective sleeve 6.

[0099] Reference Figure 19 The diagram shows that the positioning mechanism 14 of the housing 1 is equipped with a housing anti-retraction mechanism 141, which cooperates with the anti-detachment protrusion 62 of the protective sleeve 6. When the protective sleeve 6 moves outward to the housing outlet hole 11, the anti-detachment protrusion 62 enters the housing anti-retraction mechanism 141. When the tape 3 is wound up, the blocking force generated by the anti-detachment protrusion 62 entering the housing anti-retraction mechanism 141 is greater than the frictional force generated between the tape 3 and the protective sleeve 6 during winding up, stopping the protective sleeve 6 at the housing outlet hole 11, thus providing protection. Furthermore, the blocking force generated by the anti-detachment protrusion 62 entering the housing anti-retraction mechanism 141 is less than the impact force generated between the hook and rivet assembly 41 and the protective sleeve 6 during the winding up of the tape 3. After the protective sleeve 6 and the hook and rivet assembly 41 are reconnected, it smoothly retracts into the housing 1, making it convenient to carry and use next time.

[0100] Reference Figure 20 The diagram shows that the housing 1 has an outlet hole 11 with an outlet hole protrusion 112, which engages with the protective sleeve anti-retraction protrusion 68 on the protective sleeve 6. When the protective sleeve 6 moves outward from the housing 1 to the housing outlet hole 11, the protective sleeve anti-retraction protrusion 68 slides past the outlet hole protrusion 112. When the tape 3 is wound up, the blocking force exerted by the outlet hole protrusion 112 on the protective sleeve anti-retraction protrusion 68 is greater than the frictional force generated between the tape 3 and the protective sleeve 6 during winding up, thus stopping the protective sleeve 6 at the housing outlet hole 11 and providing protection. Furthermore, the blocking force generated by the anti-detachment protrusion 62 entering the housing anti-retraction mechanism 141 is less than the impact force generated between the hook and rivet assembly 41 and the protective sleeve 6 during the winding up of the tape 3. After the protective sleeve 6 and the hook and rivet assembly 41 are reconnected, it smoothly retracts into the housing 1, making it convenient to carry and use next time.

[0101] Reference Figure 21The diagram shows that the protective sleeve 6 has a notch 65, with the opening of the notch 65 facing upwards. This increases the bending angle of the tape 3 when it is wound onto the reel, thereby effectively increasing the length of the protective sleeve 6 and providing the user with a safer distance to prevent cuts. Furthermore, the notch 65 also helps the tape 3 to pass smoothly through the protective sleeve 6, improving user convenience and enhancing the overall experience.

[0102] Reference Figure 22 The protective sleeve 6 is provided with a ruler hook groove 66, which facilitates the unobstructed entry of the rivet protrusion 412 into the protective sleeve 6 and the smooth exit of the rivet protrusion 412 from the protective sleeve 6. This effectively reduces friction between the ruler strip 3 and the protective sleeve 6 during the use of the measuring tape, and increases the service life of the protective sleeve 6.

[0103] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this specification. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0104] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tape measure that prevents tape cutting, characterized in that It comprises: a housing (1) provided with a housing outlet hole (11); a reel (2) rotatably installed in the housing (1); a tape (3) wound around the reel (2), the tape (3) being configured to change between a storage state and a use state, in the storage state, the tape is wound into the housing, in the use state, the tape (3) is stretched out of the housing (1) through the housing outlet hole (11); a hook assembly (4) connected with the outer end of the tape (3) by a rivet to form a hook tape rivet assembly (41); a protective sleeve (6) movably mounted at the housing outlet hole (11) and constrained to the housing, comprising a clamping device (61); In the process of winding the tape (3) into the housing to change the tape (3) from the use state to the storage state, the hook tape rivet assembly (41) is clamped with the clamping device (61) to form a clamping connection body, which connects the protective sleeve (6) and the hook tape rivet assembly (41) together, and the protective sleeve (6) is brought into the housing (1) by the clamping connection body; in the process of stretching the tape (3) out of the housing to change the tape (3) from the storage state to the use state, the protective sleeve (6) is taken out of the housing outlet hole (11) by the clamping connection body and is constrained to stay at the housing outlet hole (11) to play a protection role, and the clamping of the hook tape rivet assembly (41) and the clamping device (61) is disconnected to allow the tape to freely stretch out; The protective sleeve (6) is provided with an anti-disengagement protrusion (62), the housing (1) is provided with a positioning mechanism (14), the housing is provided with a housing anti-disengagement portion (12), the anti-disengagement protrusion (62) is configured to move along the positioning mechanism (14) to the housing outlet hole (11), when the anti-disengagement protrusion (62) contacts the housing anti-disengagement portion (12), the protective sleeve (6) can rotate at least 5 degrees around the anti-disengagement protrusion (62), causing the tape to bend and deform or / and the two sides of the tape to contact the inner wall of the protective sleeve to generate static friction, the rotation of the protective sleeve (6) prevents the winding of the tape (3) and positions the tape (3) at the required length position.

2. The tape measure of claim 1, wherein: The hook tape rivet assembly (41) is provided with a first clamping structure, and the first clamping structure is one of a protective sleeve I protrusion (611), a protective sleeve II protrusion (612), a protective sleeve III protrusion (613), a protective sleeve I recess (614), a protective sleeve hole hook (615), a protective sleeve edge hook (616), a protective sleeve IV protrusion (617), a protective sleeve V protrusion (618), and a protective sleeve II recess (619); The clamping device (61) is provided with a second clamping structure, and the second clamping structure is one of a rivet upper protrusion (411), a rivet lower protrusion (412), a tape hook I recess (413), a tape hook II protrusion (414), a tape hook hole (415), a tape hook edge (416), a hook tape head edge (417), a tape hook recess (418), and a tape hook III protrusion (419); The hook tape rivet assembly (41) is engaged with the clamping device (61) by the first clamping structure and the second clamping structure, and the first clamping structure and the second clamping structure are engaged in any of the following ways: The protective sleeve I convex part (611) is connected in a clamping manner with the rivet upper convex part (411); The protective sleeve II convex part (612) is connected in a clamping manner with the rivet lower convex part (412); The protective sleeve III convex part (613) is connected in a clamping manner with the ruler hook I concave part (413); The protective sleeve I concave part (614) is connected in a clamping manner with the ruler hook II convex part (414); The protective sleeve hole hook (615) is connected in a clamping manner with the ruler hook hole (415); The protective sleeve edge hook (616) is connected in a clamping manner with the ruler hook edge (416); The protective sleeve IV convex part (617) is connected in a clamping manner with the hook ruler tape head edge (417); The protective sleeve V convex part (618) is connected in a clamping manner with the ruler hook concave part (418); The protective sleeve II concave part (619) is connected in a clamping manner with the ruler hook III convex part (419).

3. The tape measure of claim 1, wherein: The protective sleeve (6) is configured to have at least one of the following specifications: (1) The caliber (111) of the shell outlet hole (11) is larger than the outer caliber (600) of the protective sleeve (6) by 0.1mm-8mm; (2) The inner caliber (699) of the protective sleeve (6) is larger than the arc surface caliber (300) of the ruler tape (3) by 0.1mm-8mm; (3) The wall thickness of the protective sleeve (6) is 0.2mm-3mm.

4. The tape measure of claim 1, wherein: One side of the protective sleeve (6) corresponding to the ruler tape scale is transparent or at least partially open.

5. The tape measure of claim 1, wherein: The protective sleeve (6) is blocked in at least one of the following ways: Blocking mode one, the shell (1) is provided with a shell blocking mechanism (142), the shell blocking mechanism (142) cooperates with the anti-withdrawal convex part (62), when the protective sleeve (6) is completely withdrawn into the shell (1), the shell blocking mechanism (142) will effectively push against the anti-withdrawal convex part (62); Blocking mode two, the protective sleeve (6) is provided with a protective sleeve blocking mechanism (67), the protective sleeve blocking mechanism (67) cooperates with the shell outlet hole (11), when the protective sleeve (6) enters the deepest part of the shell (1), the shell outlet hole (11) will push against the protective sleeve blocking mechanism (67) of the protective sleeve (6).

6. The tape measure of claim 1, wherein: The anti-withdrawal convex part (62) slides within the range guided and limited by the positioning mechanism (14).

7. The tape measure of claim 6, wherein: The shell (1) and the protective sleeve (6) are provided with a retreat prevention structure, and the retreat prevention structure is at least one of the following retreat prevention structures: The first anti-retraction structure, the positioning mechanism (14) is provided with a housing anti-retraction mechanism (141), the housing anti-retraction mechanism (141) is matched with the anti-retraction convex part (62), when the protective sleeve (6) moves to the housing outlet hole (11) outside the housing (1), the anti-retraction convex part (62) enters the housing anti-retraction mechanism (141), when the ruler tape (3) is retracted into the housing, the blocking force generated by the anti-retraction convex part (62) entering the housing anti-retraction mechanism (141) is greater than the friction force generated between the protective sleeve (6) and the ruler tape (3) during retraction, so that the protective sleeve (6) is stopped at the housing outlet hole (11); and the blocking force generated by the anti-retraction convex part (62) entering the housing anti-retraction mechanism (141) is less than the impact force generated between the protective sleeve (6) and the hook belt rivet assembly (41) during retraction, so that the protective sleeve (6) and the hook belt rivet assembly (41) are reconnected together and then smoothly retract into the housing (1); The second anti-retraction structure, the housing outlet hole (11) is provided with an outlet hole convex part (112), the protective sleeve (6) is provided with a protective sleeve anti-retraction convex part (68), the outlet hole convex part (112) is matched with the protective sleeve anti-retraction convex part (68), when the protective sleeve (6) moves to the housing outlet hole (11) outside the housing (1), the protective sleeve anti-retraction convex part (68) slides through the outlet hole convex part (112), when the ruler tape (3) is retracted, the blocking force of the outlet hole convex part (112) on the protective sleeve anti-retraction convex part (68) is greater than the friction force generated between the protective sleeve (6) and the ruler tape (3) during retraction, so that the protective sleeve (6) is stopped at the housing outlet hole (11) and plays a protective role; the blocking force generated by the anti-retraction convex part (62) entering the housing anti-retraction mechanism (141) is less than the impact force generated between the protective sleeve (6) and the hook belt rivet assembly (41) during retraction, so that the protective sleeve (6) and the hook belt rivet assembly (41) are reconnected together and then smoothly retract into the housing (1).

8. The tape measure of claim 1, wherein: The protective sleeve (6) is provided with a notch (65), and the notch (65) is opened upward.

9. The tape measure of claim 1, wherein: The protective sleeve (6) is provided with a ruler hook groove (66), so that the rivet lower convex part (412) can enter the protective sleeve (6) without obstruction.

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