JP7305168B2 - tape measure silenced - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic take-up tape measure configured to automatically stop the pulled out measuring tape by means of a ratchet mechanism, and more specifically, a silent tape measure capable of reducing noise generated when the measuring tape is pulled out. Regarding.

Conventionally, an automatic take-up tape measure equipped with a measuring tape made of resin has a small measuring tape with a width of about 8 mm and a length of 2 m or less so that it can be put in a pocket of clothes without being bulky. Many tape measures can be put in a case, and many tape measures are designed to be easy to use, such as automatically stopping the measuring tape when it is pulled out.

Since the measuring tape is very flexible, an automatic stopping structure is constructed using a ratchet mechanism composed of a tooth body and a pawl body that can firmly stop the pulled out measuring tape. It is Since the ratchet mechanism is an established automatic stop mechanism, it can be installed in a case inexpensively and without being bulky.

FIG. 6 and FIG. 7 show an embodiment of a tape measure having an automatic stop structure by means of a ratchet mechanism provided with the resin measuring tape described above. The tape measure 50 comprises a rotary drum 58 (supported by a shaft 60) provided with teeth 52 of a ratchet mechanism, around which a measuring tape 54 is wound, and a take-up spring 56 inside, and an inclined surface 62 and a vertical surface. and an operation button 70 as a brake release operation body biased by a coil spring 68 which is provided with a pawl member 66 of a ratchet mechanism formed with 64 and is operated when the pulled out measuring tape 54 is wound. ing.

Then, as the measuring tape 54 is pulled out in the direction of arrow J, the rotating drum 58 rotates in the direction of arrow K, as shown in FIG. As the rotation progresses, the ratchet mechanism causes the teeth 52 of the rotating drum 58 to come into contact with the slopes 62 of the pawl 66 of the operation button 70 to disengage the pawl 66, as shown in FIGS. The pawl body 66 of the operation button 70 is pushed down during passage. Then, when the teeth 52 of the rotating drum 58 pass the pawl body 66 of the operation button 70, the pawl body 66 returns (the operation button 70 returns) as shown in FIG. 7(c).

As a result, the operation button 70 is moved from the normal position shown in FIG. (position where the operation button 70 is pulled in the direction of arrow L against the urging force of the coil spring 68 by the ratchet mechanism) shown in FIG. FIG. 7(c) shows a state where the toothed body 52 of the rotary drum 58 has passed the pawl body 66 of the operation button 70 and the operation button 70 has returned (the operation button 70 is pushed by the urging force of the coil spring 68 to the position indicated by the arrow M). direction).

When the operation button 70 is stopped at the normal position, the movement of the operation button 70 is stopped by the flange 74 formed at the base of the operation button 70 coming into contact with the inner wall surface 76 of the case 72 . Therefore, when the operating button 70 returns to the normal position (returning to the initial position: shifting from FIG. 7(b) to FIG. 7(c)), the biasing force of the coil spring 68 pushes the flange 74 of the operating button 70. It moves toward the inner wall surface 76 of the case 72 at high speed, and the upper surface of the collar 74 strongly collides with the inner wall surface 76 and stops. Due to this collision, while the measuring tape 54 is pulled out in the direction of the arrow J, a very loud and harsh collision sound (noise) resounds.

Utility Model Registration No. 2508122

SUMMARY OF THE INVENTION It is an object of the present invention to provide a silent tape measure capable of reducing harsh impact sounds (noises) that resound when a measuring tape is pulled out.

In one embodiment of the present invention, a ratchet mechanism consisting of one or more teeth and one or more pawl bodies, the teeth being installed, the measuring tape being wound therearound, and A tape measure comprising a rotating drum in which a measuring tape take-up spring is installed, and a measuring tape braking release operation body provided with a pawl body for releasing the stopped state of the pulled-out measuring tape. , the measuring tape braking release operating body is configured to be operable from the outside of the case of the tape measure, and the pawl provided on the measuring tape braking releasing operating body is moved by the first elastic means to allow the toothed body provided on the rotating drum to pass through. A tape measure configured to enter into a passing track from the outside of the track and to stop in the passing track by interfering with a stopper member, wherein between the measuring tape braking release operation body and the stopper member, To provide a silent tape measure provided with a second elastic means.

In one embodiment, the second elastic means exerts a force greater than the biasing force of the first elastic means when the pawl member of the measuring tape braking release operation body is stopped within the passage trajectory of the tooth member of the rotary drum. It has a weak urging force.

In one embodiment, the stopper member is a case of a tape measure, and a second elastic member is provided between the inner wall of the case of the tape measure and the portion located inside the case of the tape measure of the measuring tape braking release operation body. means are provided.

In one embodiment, the measuring tape braking release operating body is mounted on the shaft on which the rotating drum is supported so as to be able to reciprocate in the axial direction.

In one embodiment, the one or more teeth extend radially inwardly of the rotating drum from the inner wall of the rotating drum .

In one embodiment, a part of the measuring tape braking release operating body faces outward from the inside of the tape measure case as an operating button , while the measuring tape braking releasing operating body is located inside the tape measure case. ) A collar portion is formed at another portion, and the pawl body extends outwardly from the collar portion .

In one embodiment, the first elastic means and the second elastic means are spring members and the spring constant of the second elastic means is smaller than the spring constant of the first elastic means.

In one embodiment, the second elastic means are arranged directly or indirectly on the measuring tape deactivation actuator or stop member.

In another embodiment of the invention, a measuring tape, a rotating drum in which a measuring tape take-up spring is installed, the measuring tape being wound around the rotating drum; A measurement tape release operation body biased by an elastic body so as to be guided by and reciprocated in the axial direction of the shaft on which the rotating drum is supported, the measurement tape release operation body being one of the measurement tape release operations. one or a plurality of measuring tape braking release operation bodies, each of which faces outward from the inside of the tape measure case as an operation button, while a collar part is formed along the circumferential direction of the portion remaining inside the tape measure case; and a ratchet mechanism comprised of one or more teeth and one or more pawl bodies, the one or more teeth extending radially inwardly of the rotating drum from an inner wall of the rotating drum. On the other hand, one or more pawl members extend radially outwardly of the rotary drum from the collar portion, and the elastic energy accumulated in the elastic body causes the pawl members to move along the passage trajectory of the tooth members of the rotary drum. A tape measure having a measuring tape release operation body or an inner wall surface positioned at a predetermined position such that the measurement tape release operation body can interfere with an inner wall surface of a tape measure case when moved from the outside into the passage track. In the tape measure, a spring member is provided between the flange and the inner wall surface, and the spring constant of the spring member is smaller than the spring constant of the elastic body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the inside of a silent tape measure according to the present invention; FIG. 4 is an enlarged perspective view of an operation button; A perspective view of a tape measure. FIG. 10 is a perspective side view showing the movement of the operation button when the measuring tape is pulled out; The figure which shows one Example of the spring installed in an operation button. The perspective view which shows the inside of the conventional tape measure. FIG. 10 is a perspective side view showing the movement of the operation button when the measuring tape of the conventional tape measure is pulled out;

A silent tape measure according to the present invention will be described with reference to FIGS. 1 to 5. FIG.

As shown in FIGS. 1 to 3, the tape measure 1 has a ratchet mechanism composed of a tooth body 2 and a pawl body 4. The tooth body 2 has a measuring tape 6 wound around it and the measuring tape 6 is attached to the tooth body 2. A rotary drum 10 (supported by a shaft 14 erected on a case 12) in which a winding spring 8 is installed is provided. The pawl body 4 is provided with an operation button 16 which is a braking release operation body configured to be operated from the outside for releasing the stopped state of the pulled-out measuring tape 6 . Further, the operation button 16 has a detent structure (not shown).

The operation button 16 is fitted on a shaft 14 on which the rotary drum 10 is supported so as to be axially movable, and the operation button 16 is biased by a coil spring 22 as a first elastic means. A case 12 serving as a stopper member for preventing the operation button 16 from jumping out (moving) from the case while the pawl member 4 of the operation button 16 enters the passage track of the tooth member 2 of the rotary drum 10 from outside the passage track. is configured to stop within the passing trajectory by The passage trajectory of the toothed body 2 of the rotating drum 10 is a path along which the toothed body 2 rotating together with the rotating drum 10 passes. Since the tooth 2 rotates together with the rotating drum 10, the path of the tooth 2 always passes through the same position (track).

A spring 24 as a second elastic means is provided between the flange portion 18 of the operation button 16 and the inner wall 20 of the case 12. The spring 24 causes the pawl body 4 of the operation button 16 to rotate. When the drum 10 is stopped in the path along which the teeth 2 of the drum 10 pass, the urging force is weaker than the urging force of the coil spring 22 as the first elastic means.

The spring 24 is fitted in the button portion 26 of the operation button 16 so as to be able to expand and contract in the axial direction of the button portion 26 , and is positioned on the upper surface of the collar portion 18 . The axial direction of the button portion 26 and the axial direction of the shaft 14 on which the rotary drum 10 is supported are the same.

When the spring 24 is installed, it may be fitted on the button portion 26 of the operation button 16 so as to be stretchable and placed on the upper surface of the collar portion 18 as described above. That is, by fixing the lid portion of the case 12 in which the opening 28 (see FIG. 3) through which the button portion 26 protrudes is formed and the main body of the case 12 in which the shaft 14 supporting the rotating drum 10 is provided, the spring 24 dropout is prevented. Also, when the operation button 16 is in the normal position, there may be a play between the upper end of the spring 24 and the cover (inner wall) of the case 12 to the extent that expansion and contraction are not affected. In order to stabilize the installation state of the spring 24, the upper surface of the collar portion 18 or the inner wall 20 of the case 12 facing the spring 24 is provided with projections (about the same thickness as the spring 24) and recesses (slightly smaller than the diameter of the spring 24). wide).

Further, the spring 24 is fixedly provided on the flange portion 18 of the operation button 16 or the inner wall 20 of the case 12 in the vertical direction on the top surface of the operation button 16 by fixing means such as an adhesive or a screw. The spring 24 may be integrally formed at the time of molding the case 12 or the case 12 at the same time.

The movement of the operating button 16 will be described with reference to FIGS. 4(a) to 4(d), which show the movement of the operating button over time while the measuring tape is being pulled out.

As shown in FIG. 1, as the measuring tape 6 is pulled out in the direction of arrow A, the rotary drum 10 rotates in the direction of arrow B. As shown in FIG. As the rotation of the rotary drum 10 progresses, the tooth member 2 of the rotary drum 10 approaches the slope 30 of the pawl member 4 of the operation button 16 as shown in FIG. As shown, the tooth body 2 abuts on the slope 30 of the pawl body 4 to push down the pawl body 4 (the operation button 16 is also lowered in the direction of arrow C), and further, as shown in FIG. The pawl body 4 is also pushed down while the body 2 is passing through the pawl body 4 (the operating button 16 is also lowered in the direction of arrow D). When the teeth 2 of the rotary drum 10 pass the pawl 4 of the operation button 16, the pawl 4 returns (the operation button 16 also returns in the direction of arrow E), as shown in FIG. 4(d). .

As described above, the operation button 16 can be positioned at the normal position shown in FIG. c) (the position where the operation button 16 is pulled in the direction of arrow D against the urging force of the coil spring 22 by the ratchet mechanism), and the position shown in FIG. move. FIG. 4(d) shows a state where the tooth member 2 of the rotary drum 10 has passed the pawl member 4 of the operation button 16 and the operation button 16 has returned (the operation button 16 is pushed by the urging force of the coil spring 22 to the position indicated by the arrow E). direction).

Next, the action of the spring 24 arranged on the flange portion 18 of the operation button 16 will be described.

As shown in FIG. 4(d), when the toothed body 2 of the rotary drum 10 passes through the pawl body 4 of the operation button 16, the operation button 16 having the pawl body 4 is also returned in the direction of arrow E to return to the normal state. However, before stopping, the spring 24 located on the upper surface of the collar portion 18 moving in the return direction together with the operation button 16 is prevented from moving by the inner wall 20 of the case 12, causing the spring 24 to contract. The operation button 16 is stopped at the normal position while reducing the return speed of the operation button 16. - 特許庁

Further, when the operation button 16 is returned to the state position by the biasing force of the coil spring 22 and stopped, the biasing force is generated so that the operation button 16 is not pushed back by the biasing force of the compressed spring 24. In this state, the biasing force of the spring 24 is made to be inferior to the biasing force of the coil spring 22. - 特許庁

As a result, the impact sound (noise) generated when the operation button 16 is stopped can be greatly reduced, and the tape measure can be used without causing noise to reverberate around.

The tape measure described in Patent Document 1 reduces the noise by confining the impact sound in one room, so the mold for molding the parts is complicated, and the number of parts increases, so the manufacturing cost is high. Although it has the disadvantage of being expensive, the tape measure of the present invention can generally reduce noise by adding the spring 24, so that the quality can be improved without increasing the unit price of the product.

5(a) to 5(d) show an embodiment of the spring 24 installed on the flange portion 18 of the operation button 16. FIG. It should be noted that the material of the spring 24 may also be appropriately selected and used, such as steel or resin.

FIG. 5(a) shows a coil spring 24' which has the same form as the spring 24 described above and is formed by spirally winding a linear material. FIG. 5(a) (plan view) shows the coil spring 24' installed on the flange portion 18 of the operation button 16, and when the coil spring 24a is in a contracted state, both ends are They are formed so that they do not overlap. FIG. 5(a) (an end view along FF) shows an end face of the coil spring 24' taken along the FF line in FIG. 5(a) (a plan view). FIG. 5(a) (side view) is a side view of the coil spring 24'.

FIG. 5(b) shows a conical coil spring 32 in which a linear material is conically wound. FIG. 5(b) (plan view) shows the conical coil spring 32 installed on the flange portion 18 of the operation button 16, and when the conical coil spring 32 is contracted, the The parts are made so that they do not overlap. FIG. 5(b) (an end view of GG) shows an end face of the conical coil spring 32 cut out along the GG line in FIG. 5(b) (a plan view). FIG. 5(b) (side view) shows the conical coil spring 32 from the side.

FIG. 5(c) shows a plate spring 34 made of a thin plate material. FIG. 5(c) (plan view) shows the leaf spring 34 installed on the brim portion 18 of the operation button 16. When the leaf spring 34 is in a contracted state, it is stably contracted. , spring portions 36 are provided at two locations facing each other. FIG. 5(c) (HH end view) shows an end face of the leaf spring 34 cut along the HH line in FIG. 5(c) (plan view). FIG. 5(c) (side view) shows the leaf spring 34 from the side.

FIG. 5(d) shows a disc spring 38 in which a disc with a hole in the center is formed into a conical shape (dish shape). A (plan view) of FIG. 5D shows a state where the disc spring 38 is installed on the flange portion 18 of the operation button 16 . FIG. 5(d) (end view of II) shows an end face of the disc spring 38 cut along the II line in FIG. 5(d) (plan view). FIG. 5D (perspective view) is a perspective view of the disc spring 38 .

In addition to the springs shown in FIGS. 5(a) to 5(d), a spring washer made of a thin plate material, or a bamboo spring made by winding a thin plate material having a rectangular cross section into a conical shape may be used. good (not shown). The coil spring 24' shown in FIG. 5A and the conical coil spring 32 shown in FIG.

The teeth 2 provided on the rotating drum 10 extend from an inner wall 40 of the rotating drum 10 in a direction substantially perpendicular to the winding surface of the measuring tape 6 toward the center of the rotating drum.

Moreover, the pawl body 4 provided in the operation button 16 extends from the flange portion 18 of the operation button 16 in an outward direction substantially orthogonal to the projecting direction of the operation button 16 . A part of the button portion 26 of the operation button 16 faces outward from the inside of the case 12 . When the operation button 16 is pushed into the case 12 when winding the measuring tape 6, the upper surface of the operation button 16 and the outer surface of the case 12 are preferably flush with each other.

Further, the spring constant of the spring 24 as the second elastic means is smaller than the spring constant of the coil spring 22 as the first elastic means.

As the measuring tape 6 is pulled out from the rotating drum 10 , the winding spring 8 (spring spring) installed in the rotating drum 10 is wound up, and the measuring tape 6 is wound around the rotating drum 10 . Elastic energy is stored in the take-up spring 8 during take-up.

Further, the operation button 16 is biased by a coil spring 22 (first elastic means), and only while it is pressed against the biasing force, the measuring tape 6 is pulled out and accumulated in the take-up spring 8. The elastic energy is released, and the pulled out measuring tape 6 is wound up.

When the measuring tape 6 is pulled out to a desired length and the measuring tape 6 is released, the elastic energy stored in the spiral spring 24 is used to move the rotating drum 10 in the direction in which the measuring tape 6 is wound. Although it tries to move (rotates in the direction opposite to the direction in which the measuring tape 6 is pulled out), the tooth member 2 of the rotary drum 10 contacts the vertical surface 42 of the pawl member 4 of the operation button 16, and the measuring tape 6 is pulled out. The rotating drum 10 which is about to move in the winding direction is stopped.

DESCRIPTION OF SYMBOLS 1... Tape measure 2... Tooth body 4... Stopper 6... Measuring tape 8... Winding spring 10... Rotary drum 12... Case 14... Shaft 16... Operation button 18... Collar part 20... Inner wall 22... Coil spring 24... Spring 24 ' Coil spring 26 Button portion 28 Opening 30 Slope 32 Conical coil spring 34 Plate spring 36 Spring portion 38 Disk spring 40 Inner wall 42 Vertical surface 50 Tape measure 52 Tooth body 54 Measuring tape 56 Winding spring 58 Rotating drum 60 Shaft 62 Slope 64 Vertical surface 66 Pawl body 68 Coil spring 70 Operation button 72 Case 74 Flange 76 Inner wall surface

Claims (9)

a ratchet mechanism composed of one or more tooth bodies and one or more pawl bodies;
a rotating drum on which the tooth body is installed, a measuring tape is wound around the drum, and a winding spring for the measuring tape is installed;
a measurement tape braking release operation body having the pawl body installed therein for releasing the stopped state of the pulled-out measurement tape;
A tape measure comprising
The measurement tape braking release operation body is configured to be operable from the outside of the case of the tape measure, and the pawl provided on the measurement tape braking release operation body by a first elastic means is provided on the rotating drum. A tape measure configured to enter into the passing track from the outside of the passing track of the tooth body and to stop in the passing track by interfering with a stopper member,
A silent tape measure, wherein a second elastic means is provided between the measuring tape brake releasing operation body and the stopper member. The second elastic means has an urging force weaker than the urging force of the first elastic means when the pawl member of the measuring tape braking release operation body is stopped in the passage orbit of the toothed member of the rotary drum. 2. The tape measure of claim 1, wherein the tape measure is . The stopper member is a case of the tape measure, and a second elastic means is provided between an inner wall of the case of the tape measure and a portion positioned inside the case of the tape measure of the measuring tape brake releasing operation body. 2. The tape measure of claim 1, further comprising a . 2. The silent tape measure according to claim 1, wherein said measurement tape braking release operating body is mounted on a shaft on which said rotating drum is supported so as to be able to reciprocate in said axial direction. 2. The tape measure of claim 1, wherein said one or more teeth extend radially inwardly of said rotating drum from an inner wall of said rotating drum. A portion of the measuring tape braking release operation body faces outward from the inside of the tape measure case as an operation button, while a flange portion is formed on another portion positioned inside the tape measure case. 2. A tape measure as claimed in claim 1, wherein said pawl extends outwardly from said flange. 2. The apparatus according to claim 1, wherein the first elastic means and the second elastic means are spring members, and the spring constant of the second elastic means is smaller than the spring constant of the first elastic means. A silent tape measure. 2. The silent tape measure according to claim 1, wherein the second elastic means is provided on the measuring tape brake releasing operation body or the stopper member. a measuring tape;
a rotating drum in which the winding spring for the measuring tape is housed, the measuring tape being wound around the rotating drum;
A measuring tape braking release operation body biased by an elastic body so as to be guided by a shaft on which the rotating drum is supported and reciprocated in the axial direction, the measurement tape braking release operation body a measurement tape braking release operation body, a part of which faces outward from the inside of the tape measure case as an operation button, and a flange part formed along the circumferential direction of the part remaining inside the tape measure case;
a ratchet mechanism composed of one or more tooth bodies and one or more pawl bodies;
A tape measure comprising
While the one or more teeth extend radially inwardly of the rotating drum from an inner wall of the rotating drum,
The one or more pawl bodies extend radially outward of the rotating drum from the collar,
When the elastic energy stored in the elastic body moves the pawl from the outside of the tooth body passageway of the rotary drum to the inside of the passageway, the measurement tape braking release operation body is moved to the inner wall surface of the tape measure case. In the tape measure, the measuring tape braking release operation body or the inner wall surface is arranged at a predetermined position so as to interfere with the
A spring member is provided between the collar portion and the inner wall surface,
A silent tape measure, wherein the spring constant of the spring member is smaller than the spring constant of the elastic body.

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