CN216694687U - Measuring tape - Google Patents

Abstract

The application discloses a tape measure, which comprises a scale, a scale shell, a driving assembly, a pressing assembly and a back pressure assembly; the scale is coiled and contracted in the scale shell; a ruler outlet is formed in the ruler shell, and one end of the ruler penetrates through the ruler outlet and extends out of the ruler shell; the driving assembly and the compressing assembly are both arranged in the ruler shell, the driving assembly is fixedly connected with the inner wall of the ruler shell, the compressing assembly abuts against the ruler surface of the ruler, and the driving assembly abuts against one side, away from the ruler surface of the ruler, of the compressing assembly; one side of the back pressure component protrudes out of the ruler shell, the other side of the back pressure component is abutted against one side, facing the ruler surface of the ruler, of the pressing component, and when the back pressure component is pressed, the ruler is suitable for freely sliding relative to the ruler shell; when the back pressure component is released, the scale is static relative to the scale shell. This application has the effect of braking the scale fast when the scale retracts.

Description

Measuring tape

Technical Field

The present application relates to the field of rulers, and more particularly, it relates to a tape measure.

Background

The measuring tape is a common measuring tool, is convenient to carry, is suitable for measuring straight lines or curves, and is widely used in various industries. Common tape measures include leather tape measures, cloth tape measures, steel tape measures, and the like; the steel measuring tape is convenient to pull out and retract the steel ruler, and the application range is wide.

The prior steel tape comprises a scale and a tape shell, wherein the scale is wound layer by layer concentrically, the tape shell is covered outside the scale, a tape outlet is formed in the tape shell, and the scale can penetrate out of the tape shell from the tape outlet; a coil spring is arranged in the tape measure, the coil spring is stretched when the scale is pulled out of the scale shell, and the coil spring drives the scale to retract into the scale shell when the scale is loosened; the ruler shell is provided with a braking mechanism, one end of the braking mechanism is positioned outside the ruler shell, and the other end of the braking mechanism is positioned at the ruler outlet; the poking brake mechanism is arranged at one end of the outer side of the ruler shell, the other end of the brake mechanism is tightly abutted against the ruler, and the pulling-out and retracting speed of the ruler is slowed down by increasing the friction force between the ruler and the ruler shell.

However, when the tape measure is used, if the retraction speed of the scale is found to be too high, the braking mechanism needs to be pulled to slow down the retraction speed of the scale, and the scale still keeps the high retraction speed in the process, so that a user is easily cut.

SUMMERY OF THE UTILITY MODEL

The present application provides a tape measure for braking the scale quickly when the scale is retracted, thereby reducing the instances in which the scale cuts the user.

A tape measure comprises a scale, a scale shell, a driving assembly, a pressing assembly and a back pressure assembly; the scale is coiled and contracted in the scale shell; a ruler outlet is formed in the ruler shell, and one end of the ruler penetrates through the ruler outlet and extends out of the ruler shell;

the driving assembly and the compressing assembly are both arranged in the ruler shell, the driving assembly is fixedly connected with the inner wall of the ruler shell, and the driving assembly abuts against one side, away from the ruler surface of the ruler, of the compressing assembly to drive the compressing assembly to move towards the direction close to the ruler surface of the ruler; one side of the back pressure component protrudes out of the ruler shell, and the other side of the back pressure component is abutted against one side, facing the ruler surface of the ruler, of the pressing component; when the back pressure component is pressed down, the back pressure component drives the pressing component to be separated from the scale, and the scale is suitable for freely sliding out or retracting into the scale shell; when the back pressure assembly is loosened, the driving assembly drives the pressing assembly to press the scale, and the scale is static relative to the scale shell.

By adopting the technical scheme, a user can draw the scale out of the scale shell from the scale outlet, the drive assembly and the compressing assembly are arranged in the scale shell, the drive assembly is fixedly connected with the inner wall of the scale shell, and the drive assembly is connected with the compressing assembly, so that the drive assembly drives the compressing assembly to abut against the scale surface of the scale; one side of the back pressure component protrudes out of the ruler shell, and the other side of the back pressure component is abutted to the pressing component; when the pressing back pressure component is positioned on one side outside the ruler shell, the pressing component is separated from the ruler, and the ruler can retract into the measuring tape under the driving of the coil spring; when the back pressure assembly is loosened, the pressing assembly is abutted to the scale surface of the scale under the driving of the driving assembly, and the scale is retarded to retract through the friction force between the pressing assembly and the scale.

Therefore, when the ruler is used, a user presses the back pressure component, and the ruler freely slides out or retracts into the ruler shell; when the user finds that the speed of the scale retracting into the scale shell is too high, the user only needs to stop pressing the back pressure component, the scale stops retracting into the scale shell under the blocking of the pressing component, and the pressing component rapidly brakes the scale, so that the scale is not easy to cut the user.

Preferably, the pressing component comprises a butting block and a supporting plate, the butting block butts against the ruler surface of the ruler, the supporting plate is connected with one side, away from the ruler surface of the ruler, of the butting block, and one side, away from the butting block, of the supporting plate butts against the driving component.

Through adopting above-mentioned technical scheme, the backup pad offsets with drive assembly to drive assembly's drive power transmits to the butt piece through the backup pad, makes the butt piece support the chi face of tight scale from this.

Preferably, a friction strip is arranged on one side, facing the scale, of the abutting block, and the abutting block abuts against the scale through the friction strip.

Through adopting above-mentioned technical scheme, the friction strip increases the coefficient of kinetic friction between the chi face of butt joint piece and scale to make the frictional force increase between butt joint piece and the scale.

Preferably, the friction strip orientation joint groove has been seted up to one side of butt piece, the butt piece orientation one side of friction strip is provided with the joint piece, works as the friction strip with when the butt piece links to each other, joint piece card is gone into in the joint groove.

By adopting the technical scheme, the connection between the butt joint block and the friction strip is facilitated by the matching of the joint block and the joint groove when the tape measure is produced.

Preferably, the driving assembly comprises a pressure spring and a limiting column, one end of the limiting column is fixedly connected to the inner wall of the ruler shell, and the end face of the other end of the limiting column faces the supporting plate; the pressure spring cover is established outside the spacing post, just the one end of pressure spring with the chi shell inner wall offsets, the other end of pressure spring with the backup pad is kept away from one side of the chi face of scale offsets.

By adopting the technical scheme, the pressure spring is abutted between the inner wall of the ruler shell and the supporting plate, so that the pressure spring presses the supporting plate, and the abutting block is driven to abut against the ruler surface of the ruler; the limiting column is connected to the inner wall of the ruler shell, and the pressure spring sleeve is arranged outside the limiting column, so that the limiting column limits the pressure spring, and the pressure spring keeps axial deformation to provide elastic force for driving the abutting block.

Preferably, the back pressure assembly comprises a pressing block and a top post connected with the pressing block, a pressing hole is formed in the ruler shell, the pressing block is limited in the pressing hole, and one end, far away from the pressing block, of the top post abuts against one side, facing the abutting block, of the supporting plate; the support plate is provided with a yielding hole, and the limiting column faces towards one end of the support plate and penetrates through the yielding hole.

By adopting the technical scheme, the pressing block is limited and then pressed in the hole, so that the pressing block is not easy to be separated from the pressing hole; one side of the pressing block protrudes out of the ruler shell, so that a user can press the pressing block conveniently; one end of the top column is connected to the pressing block, the other end of the top column abuts against the supporting plate, when a user presses the pressing block, the pressing block drives the top column to move the supporting plate towards the direction of the ruler surface far away from the ruler, so that the abutting block is separated from the ruler, and the ruler can slide out or retract into the ruler shell quickly; when a user loosens the pressing block, the pressing spring drives the abutting block to abut against the scale surface of the scale, so that the scale is retarded to retract or slide out.

Preferably, one side of the supporting plate is provided with a hinge, and the supporting plate is hinged with the inner wall of the ruler shell through the hinge; the top post is located the butt piece is kept away from one side of hinge, the hole of stepping down is waist shape hole, spacing post is suitable for to follow the hole of stepping down is relative the backup pad slides.

By adopting the technical scheme, the supporting plate is hinged with the inner wall of the ruler shell through the hinge, so that the supporting plate can rotate relative to the hinge; the ejection column is positioned on one side of the abutting block, which is far away from the hinge, namely one side of the ejection column, which is close to the support plate and far away from the hinge, so that the moment of the force of the ejection column pushing the support plate to the hinge is larger, the ejection column is more labor-saving when moving towards the direction close to the support plate, and the support plate is more easily pushed to rotate along the hinge; the abdicating hole is a waist-shaped hole, the limiting column penetrates through the abdicating hole, and the limiting column can slide along the opening direction of the waist-shaped abdicating hole, so that the supporting plate is not easy to be blocked by the limiting column and cannot rotate along the hinge.

Preferably, one side of the pressing block, which is close to the top column, is provided with a slip-off prevention strip, and the slip-off prevention strips are distributed on the circumferential surface of the pressing block.

Through adopting above-mentioned technical scheme, be provided with the strip of taking off on pressing the global of one side that the briquetting is close to the fore-set, the strip of taking off will be spacing in the pressing hole according to the briquetting for it is difficult to deviate from in the pressing hole according to the briquetting.

Preferably, a positioning groove is formed in the ruler surface of the ruler, and when the ruler is contracted in the ruler shell, the abutting block is inserted into the positioning groove.

Through adopting above-mentioned technical scheme, when the scale shrink in the chi shell, thereby the butt piece inserts the locking scale in the constant head tank for thereby the scale is difficult to be pulled out because of the accident and damages.

Preferably, the abutting block is provided with an arc surface matched with the ruler surface of the ruler, and the arc surface is positioned on one side, facing the ruler surface of the ruler, of the abutting block.

Through adopting above-mentioned technical scheme, the butt piece has the cambered surface with scale chi face looks adaptation towards one side of scale chi face, and area of contact is bigger when so can make butt piece and scale butt, and local pressure is littleer for the scale is difficult to damage with butt piece extruded in-process.

In summary, the present application has the following beneficial effects:

1. the driving assembly drives the pressing assembly to tightly abut against the scale, so that the sliding speed of the scale is limited; the scale can be quickly drawn out or retracted when the back pressure group price is pressed, and the scale can be immediately abutted by the pressing component to stop sliding when the pressing component is loosened, so that the scale can be quickly braked when the retraction speed of the scale is too high, and the probability that a user is cut by the scale in the retraction process is further reduced;

2. the friction strip is arranged on one side, facing the scale, of the abutting block, friction between the abutting block and the scale is increased, and therefore the retarding effect of the pressing assembly on the scale is enhanced;

3. the utility model provides a backup pad is articulated with the chi shell inner wall, and the fore-set butt is located one side that the hinge was kept away from to the butt piece in one side of backup pad orientation butt piece and fore-set, and is more laborsaving when pressing down the jack-up backup pad of pressing the piece drive fore-set like this.

Drawings

FIG. 1 is a schematic view of the internal structure of a tape measure according to an embodiment of the present application.

Fig. 2 is an exploded view of an embodiment of the present application.

FIG. 3 is a schematic view of a hold-down assembly and a scale according to an embodiment of the present application.

Fig. 4 is a cross-sectional view of an embodiment of the present application.

Fig. 5 is an enlarged view at a in fig. 4 of the embodiment of the present application.

Fig. 6 is an exploded view of the second embodiment of the present application.

Description of reference numerals:

1. a ruler shell; 11. a tape measure chamber; 12. a ruler outlet; 13. a ruler frame; 131. perforating; 14. a baffle plate; 15. pressing the hole; 2, measuring a scale; 21. positioning a groove; 3. a drive assembly; 31. a limiting post; 32. a pressure spring; 4, pressing the assembly; 41. a butting block; 411. a cambered surface; 412. a clamping block; 42. a support plate; 421. a hole of abdication; 43. a rubbing strip; 431. a clamping groove; 44. a hinge; 5. a back pressure assembly; 51. pressing the block; 511. a slip-preventing strip; 52. and (4) a top pillar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-6 and the embodiments.

In the drawings of the embodiment of the application, a coordinate axis Z is arranged, wherein the forward direction of the Z axis represents the upward direction, and the reverse direction of the Z axis represents the downward direction.

The embodiment of the application discloses a measuring tape, referring to fig. 1 and 2, comprising a scale 2 and a tape casing 1, wherein a measuring tape chamber 11 is arranged in the tape casing 1, the scale 2 is concentrically wound and contracted in the measuring tape chamber 11 in a circle, and a coil spring connected with the scale 2 is arranged in the measuring tape chamber 11 and used for driving the scale 2 to retract into the tape casing 1 (not shown in the figure). The ruler shell 1 is provided with a ruler outlet 12, and the ruler 2 extends out of the ruler shell 1 from the ruler outlet 12 straightly after extending out of the tape measure chamber 11, so that a user can pull out the ruler 2 for measurement; the scale surface of the scale 2 is in an arc shape with two ends slightly curled, so that the scale 2 can resist certain shearing stress after being pulled out, the scale 2 can straightly extend out for a distance, and a user can conveniently measure.

A tape measure of the present application further comprises a drive assembly 3, a hold-down assembly 4 and a return assembly 5; the driving component 3 and the pressing component 4 are arranged in the ruler shell 1, the driving component 3 is fixedly connected with the inner wall of the ruler shell 1, the pressing component 4 is positioned at the ruler outlet 12, and the pressing component 4 and the ruler 2 are propped against the upper ruler surface extending out of the measuring tape chamber 11. Meanwhile, the driving piece abuts against one side, away from the scale 2, of the pressing component 4 to drive the pressing component 4 to abut against the scale 2, so that the friction force between the pressing component 4 and the scale 2 is increased to retard the sliding of the scale 2. One side of the back pressure component 5 protrudes out of the ruler shell 1, the other side of the back pressure component 5 is abutted against one side, facing the ruler 2, of the pressing component 4, when the back pressure component 5 is pressed, the pressing component 4 is separated from the ruler 2, and a user can rapidly draw out or retract the ruler 2; when loosening back pressure subassembly 5, compress tightly subassembly 4 and support tight scale 2, scale 2 stops sliding under the frictional force effect to at scale 2 purpose of fast braking scale 2 when too fast, reduce scale 2 and cut user's probability.

Wherein, ruler shell 1 bonds with compressing tightly subassembly 4 department and has a ruler holder 13, and ruler holder 13 is located ruler 2 below and is used for supporting ruler 2 so that compressing tightly subassembly 4 supports ruler 2.

Referring to fig. 2 and 3, the hold-down assembly 4 includes an abutment block 41 and a support plate 42; the butt joint block 41 abuts against the ruler surface of the ruler 2, the supporting plate 42 is connected to the butt joint block 41 and abuts against the side, away from the ruler 2, of the butt joint block 41, and the supporting plate 42 abuts against the driving component 3, so that the driving component 3 drives the butt joint block 41 to abut against the ruler 2 through the supporting plate 42, and the sliding of the ruler 2 is retarded. Here, the abutting block 41 and the supporting plate 42 are fixedly connected, and may be specifically bonded, welded or integrally formed, depending on the materials of the abutting block 41 and the supporting plate 42. The abutment block 41 is integrally injection molded with the support plate 42 in this embodiment.

Wherein, the butt piece 41 has an cambered surface 411 with the chi face adaptation of scale 2, and cambered surface 411 is located butt piece 41 towards one side of scale 2, and when butt piece 41 and scale 2 butt like this, the two area of contact is great to make the local pressure intensity of scale 2 reduce, make scale 2 be difficult for supporting the in-process with butt piece 41 and damage. Wherein, the butt piece 41 is equipped with the friction strip 43 towards one side of scale 2, and the butt piece 41 offsets with scale 2 through the friction strip 43, and the friction strip 43 can increase the frictional force between butt piece 41 and the scale 2 like this in order to strengthen the retardation effect of butt piece 41 to scale 2, can cushion the pressure between scale 2 and the butt piece 41 again for scale 2 is not fragile. The rubbing strip 43 is made of flexible wear-resistant material, such as rubber, silica gel, PVC soft rubber, and the like, and is specifically made of rubber in the embodiment.

The side of the friction strip 43 facing the abutting block 41 is provided with a clamping groove 431, the side of the abutting block 41 facing the friction strip 43 is integrally provided with a clamping block 412, and when the abutting block 41 is connected with the friction strip 43, the clamping block 412 is clamped in the clamping groove 431. Therefore, the clamping block 412 and the friction strip 43 are firmly connected, and the installation is convenient.

Wherein, the constant head tank 21 has been seted up towards the one end of butt piece 41 to scale 2, when scale 2 withdraws in the chi shell 1, butt piece 41 inserts in the constant head tank 21 to scale 2 is difficult when not using from the play chi mouth 12 roll-off and damages.

Referring to fig. 4 and 5, the driving assembly 3 includes a limiting column 31 and a pressure spring 32 sleeved outside the limiting column 31, a baffle 14 perpendicular to the drawing direction of the scale 2 and located above the scale 2 is arranged in the scale housing 1, the upper end of the limiting column 31 is fixedly connected to the lower side of the baffle 14, and the other end of the limiting column 31 faces the support plate 42; the upper end of the pressure spring 32 abuts against the baffle plate 14, and the lower end of the pressure spring 32 abuts against the side of the support plate 42 away from the abutting block 41. The pressure spring 32 is always kept in a compressed state, so that the pressure spring 32 presses the supporting plate 42 tightly, and the abutting block 41 is driven to abut against the scale 2; meanwhile, the pressure spring 32 is limited by the limiting column 31, and the pressure spring 32 keeps axial deformation and is not suitable for radial deformation, so that the pressure spring 32 stably compresses the supporting plate 42.

Between baffle 14 and the chi shell 1, all can be connected through modes such as bonding, hot melt connection, integrative moulding plastics between spacing post 31 and the baffle 14, baffle 14 bonds at the chi shell 1 inner wall in this embodiment, spacing post 31 and baffle 14 integrative injection moulding.

In this embodiment, the number of the limiting columns 31 and the number of the pressure springs 32 are two, and the limiting columns and the pressure springs are distributed on the upper side of the supporting plate 42 and are respectively located on two opposite sides of the abutting block 41, so that the elastic force of the pressure springs 32 on the supporting plate 42 is more uniform; here, the number of the limiting columns 31 and the number of the pressure springs 32 may be other values, and the installation positions may be different, and it is preferable that the pressure springs 32 apply force to the support plate 42 uniformly.

With reference to fig. 6, the back pressure assembly 5 includes a pressing block 51 and a top pillar 52 connected to the upper side of the pressing block 51, the ruler housing 1 has a pressing hole 15 below the ruler 2 facing the pressing assembly 4, the pressing block 51 is installed in the pressing hole 15, and the top pillar 52 is located on one side of the pressing block 51 facing the pressing assembly 4. The ruler frame 13 is provided with a through hole 131 for one end of the top column 52 far away from the pressing block 51 to pass through, and the top column 52 passes through the through hole 131 and abuts against the lower side of the supporting plate 42; simultaneously, the support plate 42 is provided with a yielding hole 421 corresponding to the limiting column 31, the limiting column 31 is arranged in the yielding hole 421 in a penetrating manner, so that when the user presses the pressing block 51, the top column 52 moves upwards and pushes the support plate 42 to move upwards to extrude the pressure spring 32, one end of the limiting column 31 is arranged in the yielding hole 421 in a penetrating manner, the support plate 42 can slide upwards relative to the limiting column 31 and drive the abutting block 41 to leave the scale 2, and the scale 2 can slide out or retract into the scale shell 1 quickly.

A hinge 44 is adhered to one side of the supporting plate 42 close to the inner wall of the ruler shell 1, and the supporting plate 42 is hinged with the inner wall of the ruler shell 1 through the hinge 44. The top pillar 52 abuts against the lower side of the support plate 42 and the top pillar 52 is located on the side of the abutting block 41 away from the hinge 44, so that when the top pillar 52 jacks up the support plate 42, the moment of the acting force of the top pillar 52 on the support plate 42 to the point of the hinge 44 is large, and the top pillar 52 is favorable for lifting up the support plate 42. It should be noted that, the abdicating hole 421 is a waist-shaped hole or a long rectangular hole, so that when the pressing block 51 is pressed, the top pillar 52 is lifted upwards to push the supporting plate 42 to rotate along the hinge 44, the limiting pillar 31 penetrates through the abdicating hole 421 and can slide relative to the supporting plate 42 along the abdicating hole 421, and therefore the limiting pillar 31 does not block the supporting plate 42 easily so that the supporting plate 42 cannot rotate along the hinge 44.

In addition, the side of the pressing block 51 facing the top column 52 is integrally formed with a slip-off preventing strip 511, the slip-off preventing strip 511 is arranged on the peripheral surface of the pressing block 51, and when the pressing block 51 is released, the slip-off preventing strip 511 is suitable for abutting against the inner wall of the ruler shell 1 and limiting the pressing block 51, so that the pressing block 51 is not easy to completely slip out of the pressing hole 15.

In summary, by pressing or releasing the back pressure assembly 5, the tape measure of the embodiment of the present application has the following states:

in the locking state, namely, the user completely releases the pressing block 51, the abutting block 41 abuts against the scale 2, and when the user does not pull or push the scale 2, the scale 2 is static relative to the scale shell 1;

an unlocked state, namely, the user presses the pressing block 51 into the pressing hole 15 completely, the supporting plate 42 is jacked up by the jacking column 52, the abutting block 41 leaves the scale 2 completely, and the scale 2 can slide out or retract into the scale shell 1 quickly;

a half-locked state, i.e. the user presses the pressing block 51 between the locked state and the unlocked state, in which the scale 2 can be slowly retracted into the scale case 1 with the abutment block 41 blocked.

When using a tape measure according to an embodiment of the present application, a user can press the pressing block 51 with different force as needed, thereby adjusting the speed of withdrawing or retracting the scale 2.

The implementation principle of the embodiment of the application is as follows:

when the tape measure of the embodiment of the application is assembled, the pressing block 51 is installed into the pressing hole 15 from the inside of the tape shell 1, the tape frame 13 is adhered in the tape shell 1, and the top post 52 penetrates through the through hole 131; the scale 2 is positioned above the scale frame 13 and one end of the scale 2 extends out of the scale outlet 12; the supporting plate 42 is hinged with the inner wall of the ruler shell 1 through a hinge 44, and the abutting block 41 abuts against the ruler surface of the ruler 2; the pressure spring 32 is sleeved outside the limiting column 31, one end, far away from the baffle plate 14, of the limiting column 31 penetrates into the abdicating hole 421 to position the limiting column 31 and the supporting plate 42, the baffle plate 14 is pressed to compress the pressure spring 32, and then the baffle plate 14 is bonded on the inner wall of the ruler shell 1.

When the tape measure is used, a user can slowly pull out the scale 2 when releasing the pressing block 51, and can pull out or retract the scale 2 from the scale shell 1 at different speeds when pressing the pressing block 51 with different forces; a user safely presses the pressing block 51 to enable the tape measure to be in an unlocking state, and the scale 2 can freely retract into the scale shell 1 under the driving of the coil spring; when the retraction speed of the scale 2 is too high, the user releases the pressing block 51, the tape measure is in a locking state, and the scale 2 is braked by the pressing component 4 and is not easy to continuously slide; the user can also press the pressing block 51 to make the tape measure in a half-locked state, and adjust the retraction or extension speed of the scale 2 by adjusting the pressing force.

The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. A tape measure, characterized by: comprises a scale (2), a scale shell (1), a driving component (3), a pressing component (4) and a back pressure component (5); the scale (2) is wound and contracted in the scale shell (1); a ruler outlet (12) is formed in the ruler shell (1), and one end of the ruler (2) penetrates through the ruler outlet (12) and extends out of the ruler shell (1);

the driving assembly (3) and the pressing assembly (4) are both arranged in the ruler shell (1), the driving assembly (3) is fixedly connected with the inner wall of the ruler shell (1), and the driving assembly (3) abuts against one side, away from the ruler surface of the ruler (2), of the pressing assembly (4) so as to drive the pressing assembly (4) to move towards the direction close to the ruler surface of the ruler (2); one side of the back pressure component (5) protrudes out of the ruler shell (1), and the other side of the back pressure component (5) is abutted against one side, facing the ruler surface of the ruler (2), of the pressing component (4); when the back pressure component (5) is pressed, the back pressure component (5) drives the pressing component (4) to be separated from the scale (2), and the scale (2) is suitable for freely sliding out or retracting into the scale shell (1); when the back pressure component (5) is released, the driving component (3) drives the pressing component (4) to press the scale (2), and the scale (2) is static relative to the scale shell (1).

2. A tape measure according to claim 1, wherein: compress tightly subassembly (4) including butt piece (41) and backup pad (42), butt piece (41) with the chi face of scale (2) offsets, backup pad (42) with butt piece (41) is kept away from one side of the chi face of scale (2) links to each other, backup pad (42) are kept away from one side of butt piece (41) with drive assembly (3) offset.

3. A tape measure according to claim 2, wherein: one side, facing the scale (2), of the abutting block (41) is provided with a friction strip (43), and the abutting block (41) abuts against the scale (2) through the friction strip (43).

4. A tape measure according to claim 3, wherein: friction strip (43) orientation joint groove (431) have been seted up to one side of butt joint piece (41), butt joint piece (41) orientation one side of friction strip (43) is provided with joint piece (412), works as friction strip (43) with when butt joint piece (41) link to each other, joint piece (412) card is gone into in joint groove (431).

5. A tape measure according to claim 2, wherein: the driving assembly (3) comprises a pressure spring (32) and a limiting column (31), one end of the limiting column (31) is fixedly connected to the inner wall of the ruler shell (1), and the end face of the other end of the limiting column (31) faces the supporting plate (42); the pressure spring (32) is sleeved outside the limiting column (31), one end of the pressure spring (32) is abutted to the inner wall of the ruler shell (1), and the other end of the pressure spring (32) is abutted to one side, away from the ruler surface of the ruler (2), of the supporting plate (42).

6. A tape measure according to claim 5, wherein: the back pressure assembly (5) comprises a pressing block (51) and a top column (52) connected with the pressing block (51), a pressing hole (15) is formed in the ruler shell (1), the pressing block (51) is limited in the pressing hole (15), and one end, far away from the pressing block (51), of the top column (52) is abutted to one side, facing the abutting block (41), of the supporting plate (42); offer hole of stepping down (421) on backup pad (42), spacing post (31) orientation the one end of backup pad (42) is worn to establish in hole of stepping down (421).

7. A tape measure according to claim 6, wherein: a hinge (44) is arranged on one side of the supporting plate (42), and the supporting plate (42) is hinged with the inner wall of the ruler shell (1) through the hinge (44); the top pillar (52) is positioned on one side of the abutting block (41) far away from the hinge (44); the hole of stepping down (421) is waist shape hole, spacing post (31) are suitable for to follow hole of stepping down (421) is relative backup pad (42) slides.

8. A tape measure according to claim 6, wherein: one side of the pressing block (51) close to the top column (52) is provided with a slip-off prevention strip (511), and the slip-off prevention strips (511) are distributed on the circumferential surface of the pressing block (51).

9. A tape measure according to claim 2, wherein: the ruler surface of the ruler (2) is provided with a positioning groove (21), and when the ruler (2) shrinks in the ruler shell (1), the abutting block (41) is inserted into the positioning groove (21).

10. A tape measure according to claim 2, wherein: the abutting block (41) is provided with an arc surface (411) matched with the ruler surface of the ruler (2), and the arc surface (411) is located on one side, facing the ruler surface of the ruler (2), of the abutting block (41).

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