JP4578082B2 - Tape measure - Google Patents

Description

The present invention relates to a tape measure capable of winding and storing a tape in a case.

Nowadays, many of the tape measures are widely used as an automatic winding type that automatically winds a measuring tape, and the tape is wound around a shaft standing up in a case and the tape is wound around the tape. It is a tape measure which pivotally supports the rotating drum with which the urging | biasing means which urges | biases in a winding direction was equipped internally.
In other words, a shaft provided upright in the case is fitted with a through hole of the rotating drum, and an end of a coil spring serving as a biasing means provided in the rotating drum is engaged with a slit formed on the shaft to rotate. The drum is pivotally supported.

In many cases, the shaft is installed in a standing state in a non-removable state in one of the two half cases constituting the case. The installation is performed by an onsert or an insert, and the half case provided with the shaft is stored for an appropriate time.
The shaft protrudes considerably from the half case, and the shaft is also formed with a slit for engaging the coil spring. Furthermore, the shaft is made of an aluminum material that is easy to mold, so it can be stored and transported. In addition, the shaft may be damaged by handling during assembly. That is, the shaft protrudes until the rotating drum is set.

If the shaft breaks, repair the shaft that can be repaired as appropriate so that the shaft can be used. However, if the shaft cannot be repaired, the shaft is fixed to the half case so that it cannot be removed. Therefore, it is unavoidable to discard the normal half case.
This disposal causes economic loss, and if the number of disposal increases, parts may be missing. Also, when repairing the shaft, if it takes time to repair the shaft, the production efficiency is reduced.

And when the above-mentioned thing occurs when manufacturing the tape measure provided with the friction reducing means for reducing the sliding friction between the shaft and the rotating drum manufactured by the applicant, depending on the form of the installed friction reducing means, The entire friction reducing means is discarded.
Therefore, this problem is caused by the fact that each work proceeds after the shaft is installed in the half case. However, considering the work efficiency and workability throughout the assembly work, the shaft is installed in the half case. Is better. For this reason, at present, it is said that loss is inevitable.

However, it is certain that high-performance tape measure such as a tape measure provided with friction reducing means will be developed more and more in the future. At this time, it is extremely disadvantageous in manufacturing that loss generation is unavoidable. It will be.
Accordingly, the present invention has been made in view of the above-described problems, and it is possible to easily and easily install the shaft for supporting the rotating drum in the case at the best time in the assembly flow. The object is to provide a tape measure that can be made.

  The gist of the present invention is a tape measure that pivotally supports a rotating drum that is internally provided with a biasing means for winding the tape around the shaft and biasing the tape in the winding direction on a shaft standing in the case. The tape measure is characterized in that an opening is provided in a predetermined wall of the case, and a lid on which a shaft for supporting the rotating drum is erected is attached to the opening.

The tape measure of the present invention will be described in detail. The case is a member that accommodates a measuring tape and is also the main body of the tape measure. The case may be appropriately formed using a resin material, a metal material, or the like. For example, two half cases may be combined to form one case.
The wall of the case in which the opening is provided is a wall of the case (case side wall) in which a shaft for supporting the rotating drum is erected, and the wall includes an appropriate range including at least the installation position of the shaft. An opening is provided. The size and shape of the opening are not particularly limited.

A lid is a member attached to the above-mentioned opening. The size and shape of the opening and the lid may be determined as appropriate in consideration of the shaft to be erected. The material of the lid is not particularly limited. For example, it may be formed of the same material as the case, or may be formed of a different material. Further, it may be transparent or translucent so that the inside of the case can be seen through the lid.
Moreover, the attachment form to the opening of the lid is not particularly limited as long as the lid is easily attached or fixed so that the lid does not easily fall off or loosen. The specific attachment includes fitting (fitting), screwing, fixing using another member, and the like. It is desirable to prevent dust from entering.

  And the installation form, the installation method, etc. in the cover body of a shaft are not specifically limited, What is necessary is just to install suitably. For example, it may be installed (fixed) in an upright state inside the lid body by an onsert or an insert, or may be installed (fixed) by a screw or an adhesive. That is, the shaft is erected by embedding the base portion of the shaft in the inner wall when the lid is molded. The shaft is erected by press-fitting the base portion of the shaft into the recess formed in the inner wall of the lid or the hollow portion of the protruding member. The shaft is press-fitted from the outside of the lid body into the opening provided in the lid body, and the shaft is erected on the inner wall of the lid body. The shaft is erected on the inner wall of the lid body by tightening the male screw threaded from the base end of the shaft inwardly and threaded from the outside of the lid body. The shaft base is erected by inserting and bonding the base portion of the shaft into the recess formed in the inner wall of the lid or the hollow portion of the protruding member.

In the installation of the shaft, only the shaft may be erected, and in this case, the rotating drum is fitted to the shaft body. In some cases, a protrusion having an appropriate height is provided around the shaft or close to the shaft or appropriately separated. In this case, the rotating drum is fitted into the shaft body or the protrusion. It fits into a strip.
Therefore, the shaft in the present specification includes an appropriate forming portion such as a ridge formed around or near the shaft together with the shaft main body. That is, a member formed in the case and fitted with the rotating drum is also interpreted as a part of the shaft.

As a form of the shaft to be installed, a slit is provided from the tip of the shaft toward the base, and an end of a coil spring for winding up the tape built in the rotary drum is engaged with the slit.
In addition, a female screw is threaded inward from the tip of the shaft, and by tightening the male screw inserted from the outside of the case, the tip of the shaft is attached to the side wall in the case or the engaging portion provided on the side wall. Some can be fixed.

Then, a second opening is provided in the wall of the case facing the tip of the shaft erected on the lid, and the tip of the shaft (including the vicinity of the tip is included) in the second lid that can be fitted into the second opening. ) May be supported as appropriate.
The form of the support is not particularly limited. For example, a recess (engagement portion) that can be engaged with the tip of the shaft or a peripheral surface near the tip is formed in the lid, and the tip of the shaft is inserted into the recess. You may do it. The recess is preferably substantially the same diameter as the diameter of the shaft insertion site. Alternatively, if a female screw is threaded inward from the tip of the shaft, the inner screw of the second lid is tightened by a male screw inserted from the outside of the case into the concave portion provided in the second lid. It may be fixed.

  In addition, the size and shape of the second opening and the second lid may be appropriately determined in consideration of the supporting shaft and the like. The material of the second lid is not particularly limited, and for example, it may be formed of the same material as the case, or may be formed of a different material. Further, it may be transparent or semi-transparent so that the inside of the case can be seen through the second lid. Also, the form of attachment of the second lid to the second opening is not particularly limited, but it must be attached (fixed) so that the second lid does not easily fall off or sag. The specific mounting form is fitting (fitting), screwing, or the like, and it is desirable that dust or the like does not enter.

  The rotating drum is supported on the above-mentioned shaft as appropriate. The rotating drum has a measuring tape on which a memory is printed, wound around a winding drum, and a coiled winding spring for winding the tape is provided inside, and the end of the spring Is engaged with a slit formed in the shaft. The spring is not particularly limited, and a spring having an appropriate torque may be used. However, when an appropriate friction reducing means described later is provided, a coil spring having a torque about 5 to 50% smaller than the torque of the conventional coil spring is used. It may be used.

In addition, the tape enters and exits from the tape entrance / exit provided below the front wall of the case, and when the tape winding is finished, the locking piece at the tip of the tape is engaged with the tape entrance / exit so that the tape Is prevented from being pulled into the case.
Since the locking piece collides with the tape inlet / outlet at a considerable speed, an impact buffering member that relaxes (including the absorbing action) the collision energy of the locking piece is usually provided at the tape inlet / outlet. .

Furthermore, an appropriate friction reducing means made of metal or resin may be provided between the aforementioned shaft and the rotating drum. The friction reducing means functions to reduce frictional resistance during rotation (including intervening) provided between the shaft and the rotating drum.
And what constitutes (forms) the friction reducing means is interpreted as friction reducing means regardless of a member (including shape) that acts directly as friction reduction or a member (including shape) that works indirectly. Is. Moreover, the form may also consist of a single item, or may be a combination of a plurality of members. Specific examples of the friction reducing means include a flat plate, a bush member having a raised opening edge, and a bearing member.

The above-described bush member is also suitable as the friction reducing means, but a particularly preferred form is a bearing member, and the bearing member is provided between the shaft and the rotating drum. That is, a bearing member is interposed between the shaft and the rotating drum.
The bearing member suitable for this part has a large number of spheres interposed between the outer ring and the inner ring so that the outer ring and the inner ring can rotate freely and rotational friction resistance. It is preferable that the rotation is made extremely small.
Of course, it is not limited to the bearing member of this structure, What is necessary is just to use the bearing member which consists of a suitable structure.

As a specific example of the above-described bearing member interposed, a through hole provided in the center of the ring body inside the bearing member is inserted and fixed to the shaft, and a rotating drum is inserted into the outer periphery of the ring body outside the bearing member. Or by inserting and fixing the outer periphery of the outer ring of the bearing member into the hole formed in the center of the rotating drum, and inserting the through hole in the center of the inner ring of the bearing member into the shaft. Good.
Of course, it is not limited to this, What is necessary is just to interpose with a suitable form or method.

If another suitable form is shown as a friction reduction means, a metal member will be raised and the metal member will be provided between a shaft and a rotating drum. That is, a metal member is interposed between the shaft and the rotating drum.
The metal member suitable for this part may be a general cylindrical member, or may be formed with an eaves or the like protruding outward at one end thereof. You may form in. The metal member as the friction reducing means includes a washer / sheet / bush.
Further, the metal member may have a two-layer structure, and each of the metal members may be slid in the same direction or in the opposite direction. That is, the metal member is slidably fitted into the hole of the metal member.

As a specific example in the interposition of a metal member, a general cylindrical thing inserts and fixes the through-hole which a metal member has in a shaft, and inserts a rotation drum in the perimeter of the metal member, and also rotates. The outer periphery of the metal member may be inserted and fixed in a through hole formed in the center of the drum, and the through hole of the metal member may be fitted on the shaft.
Moreover, what formed the eaves which protrude outward in the end of a metal member is good to position the eaves on the outer side of the side wall of a rotating drum.

The metal member has a two-layer structure, and each of the metal members can slide in the same direction or in the opposite direction. The outer metal member is slidably fitted on the outer side of the inner metal member. Therefore, the through hole of the inner layer metal member may be inserted into the shaft and fixed, and the outer periphery of the outer layer metal member may be inserted into the through hole formed at the center of the rotary drum and fixed.
Of course, the interposition form of the above-mentioned metal member is not limited to this, and may be intervened by a suitable form or method. Also, the type of metal member is not particularly limited, and a general dry or oil-impregnated material may be selected and used.

If other suitable forms are shown as the friction reducing means, the protrusions or ridges are raised, and the protrusions or ridges are formed on the shaft and / or the rotating drum. That is, a protrusion or a protrusion is interposed between the shaft and the rotating drum.
There are cases where protrusions or ridges are formed on the shaft, and cases where the rotation drum is formed in a hole formed in the center of the rotation drum. In the case of resin, the formation is performed at the time of molding the shaft and the rotation drum. It is formed in one piece, or it is formed on another holding member by a predetermined method (integrated molding, adhesion, etc.), and the holding member is fixedly or fitted to the shaft or rotating drum. Also good. In the case of metal, it may be fixed by insert or on-sert molding.

The protrusions or ridges may be provided on one of the shaft and the rotating drum, but may be provided on both the shaft and the rotating drum.
As a specific form when it is provided on one of the shaft and the rotating drum, when it is provided on the shaft, the top of the protrusion or the ridge should be able to substantially contact the peripheral wall of the hole that fits the shaft of the rotating drum. Good. Moreover, when it provides in the hole formed in the center of the rotating drum, ie, a rotating drum, it is good to make it possible for the top part of a protrusion or a protrusion to substantially contact the surrounding wall of a shaft.

And as a concrete form when it is provided on both the shaft and the rotating drum, the top of the protrusion or protrusion provided on the shaft can be brought into substantially contact with the peripheral wall of the hole that fits the shaft of the rotating drum, and the rotation It is preferable that the tops of protrusions or ridges provided on the peripheral wall of the hole that fits in the shaft of the drum can substantially contact the peripheral wall of the shaft.
Further, the shaft and the projection provided on the rotating drum or the tops of the protrusions may be in contact with each other.
Of course, forms such as the interposition of the protrusions or protrusions and the contact of the top are not limited thereto. Further, a guide means such as a groove or a protrusion may be formed at a portion where the protrusion or protrusion substantially contacts.

The shape of the protrusions or ridges described above is not particularly limited, and specifically, a shape that can reduce the sliding resistance when the top portion is in contact is preferable.
For example, in the case of a protrusion, the shape of the top is preferably substantially spherical or hemispherical, and in the case of a ridge, the shape of the top is preferably substantially U-shaped in cross section. The length of the protrusion is not particularly limited, and it may be provided on the entire circumference of the hole that fits the shaft or the shaft of the rotary drum, but it is preferably formed at three locations so that it can be supported at three points. Also, the number of protrusions is preferably three so that the protrusions can be supported at three points. Of course, the shape of the protrusions or protrusions and the number of the protrusions or protrusions are not limited thereto.

In another preferred form as the friction reducing means, the sphere is raised, and the sphere is loosely fitted in a recess formed in the shaft and / or the rotating drum. That is, a sphere is interposed between the shaft and the rotating drum. The recess may have any shape as long as the sphere can be loosely fitted, may have substantially the same shape as the sphere, may have a cubic shape, or may have a groove shape. The spherical body is loosely fitted from the front surface, but may be loosely fitted from the back surface side, and in that case, a holding member is provided so as not to fall off the back surface side.
There are cases where a hollow for loosely fitting a sphere is formed on the shaft and a hole formed in the center of the rotating drum, that is, the center of the rotating drum. Alternatively, it may be formed integrally with another holding member, and the holding member may be fixedly attached to the shaft or the rotating drum. In the case of metal, it may be fixed by insert or on-sert molding.

The hollow for loosely fitting the sphere may be provided on one of the shaft and the rotating drum, but of course, it may be provided on both the shaft and the rotating drum.
As a specific form when it is provided on one of the shaft and the rotating drum, when it is provided on the shaft, the sphere can be loosely fitted in the recess, and the sphere can almost contact the peripheral wall of the hole that fits the shaft of the rotating drum. It is good to make it. Moreover, when it provides in the hole formed in the center of the rotating drum, ie, a rotating drum, it is good to make a spherical body substantially contact the surrounding wall of an axis | shaft.

And as a specific form when it is provided on both the shaft and the rotating drum, the sphere is loosely fitted in a recess provided on the shaft, and the sphere is substantially in contact with the peripheral wall of the hole that fits on the shaft of the rotating drum. Further, it is preferable that the sphere is loosely fitted in a recess provided in the peripheral wall of the hole fitted to the shaft of the rotating drum and that the sphere can substantially contact the peripheral wall of the shaft.
Moreover, you may contact | abut in the state which the vertex of the spherical body provided in the axis | shaft and the rotating drum almost contacts. Here, when the sphere is fixedly provided, it is interpreted as the above-described protrusion.
Of course, the form of the interposition of the sphere and the contact of the apex is not limited to this. Moreover, you may form guide means, such as a groove | channel and a protrusion, in the site | part which a spherical body substantially contacts.

The shape and depth of the recess for loosely fitting the sphere are not particularly limited. However, when the shaft and the rotating drum are set, the sphere must not be detached from the recess. The number of intervening spheres is not particularly limited, but it is preferably formed at three locations so that they can be supported at three points.
Also, in fitting the sphere into the recess, the sphere is fitted into the recess before setting the shaft and the rotating drum, or the sphere is inserted into the recess after setting the shaft and the rotating drum. You may make it. In the latter case, since the sphere is fitted in a press-fitted state, the material used for forming the shaft and / or the rotating drum is preferably a material having appropriate elasticity.

Then, when two or more friction reducing means are provided, each of them or an appropriate one may be formed of different materials. As a specific example, when the above-mentioned protrusions, protrusions, or spheres are provided on each of the shaft and the rotating drum, the materials used for the shaft and the rotating drum are different materials, for example, a resin material that has a different friction coefficient. (Nylon / ABS), each of which may be made of a different material such as a resin material or a metal material.
Further, when two or more friction reducing means are provided, an appropriate shape, for example, an intervening member such as a cylindrical body, may be provided between each of them or between appropriate ones.

Further, although the friction reducing means, that is, the bearing member / metal member / projection or protrusion / sphere, is effective only by being provided on one side of the shaft or rotating drum, it is more effective that both sides of the shaft or rotating drum are effective. It is good to provide so that it may be located in. In addition, the above-described interposition refers to a form located with play, and includes a form (attachment) located fixedly.
The present invention is also characterized in that the coil spring as the biasing means has a low torque. The magnitude of the tape winding torque by the coil spring is determined by the material, width, thickness, length, etc. of the tape, but the torque of the coil spring according to the present invention is about 5 to 50% smaller than the torque of the conventional coil spring.

Moreover, you may provide the appropriate friction reduction means which consists of a metal or resin between the inner wall of a cover body and / or the inner wall of the said case, and a rotating drum. In the meantime, not only between the inner wall of the lid and the inner wall of the case but also directly between the inner wall of the lid or the inner wall of the case or through a separate member installed. . Therefore, an appropriate friction reducing means may be provided on the forming portion formed on the inner wall of the lid or the inner wall of the case or on another member installed.
Then, the rotation of the rotating drum will be described. Since the rotating drum is loosely fitted to the shaft and rotates, the rotating drum cannot rotate with a fixed trajectory. The rotation in contact with (including). However, the contact does not always rotate while contacting the inner wall of the case, but rotates while contacting when the rotation posture is broken.

For this reason, appropriate friction reducing means made of metal or resin is provided at an appropriate portion between the inner wall of the lid and / or the inner wall of the case and the rotating drum. The friction reducing means functions to reduce frictional resistance due to contact (including interposition) provided between the inner wall of the lid and / or the inner wall of the case and the rotating drum.
And what constitutes (forms) the friction reducing means is interpreted as friction reducing means regardless of a member (including shape) that acts directly as friction reduction or a member (including shape) that works indirectly. Is. Moreover, the form may also consist of a single item, or may be a combination of a plurality of members.

When a particularly preferable form is shown as the friction reducing means, an appropriate bearing member is raised, and the bearing member is provided between the rotating drum and the inner wall of the lid and / or the inner wall of the case. That is, the bearing member is interposed between the rotating drum and the inner wall of the lid and / or the inner wall of the case.
The bearing member suitable for this part is a cylindrical shape in which a large number of rods supported rotatably (including shaft support) are arranged in a ring on the same plane and facing the center. Although what is called a bearing etc. is good, of course, it is not limited to the bearing member of this structure, What is necessary is just to use the bearing member which has a suitable structure.

As a specific example of the above-described bearing member, the bearing member may be fixed to an appropriate portion of the outer wall of the rotating drum, and the rotating member of the bearing member may be substantially in contact with the inner wall of the lid and / or the inner wall of the case. Good. Further, the bearing member may be fixed to an appropriate portion of the inner wall of the lid and / or the inner wall of the case, and the rotating member of the bearing member may be substantially in contact with the outer wall of the rotating drum.
Of course, the present invention is not limited to this, and may be interposed in a suitable form or method, but it is preferable that the rotation trajectory of the rotary drum can be made constant. For example, a guide means such as a groove or a protrusion may be formed at a site where the rotating body of the bearing is substantially in contact.

When another suitable form is shown as the friction reducing means, the protrusions or ridges are raised, and the protrusions or ridges are formed on the side wall of the rotating drum and / or the inner wall of the lid and / or the inner wall of the case. That is, a protrusion or a protrusion is interposed between the outer wall of the rotating drum and the inner wall of the lid and / or the inner wall of the case.
There are cases where protrusions or ridges are formed on the outer wall of the rotating drum and cases where it is formed on the inner wall of the lid and / or the inner wall of the case. It is formed in one piece when it is molded, or it is formed on another holding member by a predetermined method (integrated molding, adhesion, etc.), and the holding member is placed on the outer wall of the rotating drum, the inner wall of the case, or the inner wall of the lid You may make it attach to fixedly or fittingly. In the case of metal, it may be fixed by insert or on-sert molding.

The protrusions or ridges may be provided on one of the outer wall of the rotating drum or the inner wall of the lid and / or the inner wall of the case. Of course, the outer wall of the rotating drum and the inner wall of the lid and / or the case It may be provided on both of the inner walls.
As a specific form when it is provided on one of the outer wall of the rotating drum and / or the inner wall of the lid and / or the inner wall of the case, when it is provided on the outer wall of the rotating drum, the top of the protrusion or protrusion is the inner wall of the lid. And / or approximately contact the inner wall of the case. Further, when provided on the inner wall of the lid and / or the inner wall of the case, it is preferable that the tops of the protrusions or ridges can substantially contact the outer wall of the rotating drum.

And as a concrete form in the case of being provided on both the outer wall of the rotating drum and the inner wall of the lid and / or the inner wall of the case, the top of the protrusion or protrusion provided on the outer wall of the rotating drum is the inner wall of the lid and It is preferable that the inner wall of the case is substantially in contact with the inner wall of the lid and / or the top of the protrusion or the protrusion provided on the inner wall of the case is substantially in contact with the outer wall of the rotating drum.
Moreover, you may contact | abut in the state which the top part of the protrusion or protrusion provided in the rotating drum outer wall, the inner wall of a cover body, and / or the inner wall of a case contacts.
Of course, forms such as the interposition of the protrusions or protrusions and the contact of the top are not limited thereto. Further, a guide means such as a groove or a protrusion may be formed at a portion where the protrusion or protrusion substantially contacts so that the rotation trajectory of the rotating drum can be made constant.

The shape of the protrusions or ridges described above is not particularly limited, and specifically, a shape that can reduce the sliding resistance when the top portion is in contact is preferable.
For example, in the case of a protrusion, the shape of the top is preferably substantially spherical or hemispherical, and in the case of a ridge, the shape of the top is preferably substantially U-shaped in cross section. The length of the protrusion is not particularly limited, and it may be provided in an annular shape at an appropriate portion of the outer wall of the rotating drum or the inner wall of the lid and / or the inner wall of the case, but preferably 3 so that it can be supported at three points. It is good to form in the place. Also, the number of protrusions is preferably three so that the protrusions can be supported at three points. Of course, the shape of the protrusions or protrusions and the number of the protrusions or protrusions are not limited thereto.

In another preferred form as the friction reducing means, the sphere is raised, and the sphere is loosely fitted in a recess formed in the inner wall of the rotating drum and / or the lid and / or the inner wall of the case. That is, a sphere is interposed between the rotating drum and the inner wall of the case. The recess may have any shape as long as the sphere can be loosely fitted, may have substantially the same shape as the sphere, may have a cubic shape, or may have a groove shape. The spherical body is loosely fitted from the front surface, but may be loosely fitted from the back surface side, and in that case, a holding member is provided so as not to fall off the back surface side.
There are cases where a hollow for loosely fitting a sphere is formed on the outer wall of the rotating drum and a case where it is formed on the inner wall of the lid and / or the inner wall of the case. It is formed in one piece at the time, or formed integrally with another holding member, and the holding member is fixedly attached to the outer wall of the rotating drum or the inner wall of the lid and / or the inner wall of the case. Also good. In the case of metal, it may be fixed by insert or on-sert molding.

The hollow for loosely fitting the sphere may be provided on the outer wall of the rotating drum or the inner wall of the lid and / or the inner wall of the case. Of course, the outer wall of the rotating drum and the inner wall of the lid and / or the case It may be provided on both of the inner walls.
As a specific form when it is provided on one of the outer wall of the rotating drum and the inner wall of the lid and / or the inner wall of the case, when it is provided on the outer wall of the rotating drum, the sphere is loosely fitted in the recess and the sphere is It is preferable that the inner wall of the case can be almost touched. Moreover, when it is provided on the inner wall of the lid and / or the inner wall of the case, it is preferable that the sphere can substantially contact the outer wall of the rotating drum.

And as a specific form when it is provided on both the outer wall of the rotating drum and the inner wall of the lid and / or the inner wall of the case, the sphere is loosely fitted in the recess provided on the outer wall of the rotating drum and the sphere is the lid. The inner wall of the casing and / or the inner wall of the case can be substantially in contact with each other, and the sphere can be loosely fitted in a recess provided in the inner wall of the lid and / or the inner wall of the case, and the sphere can be substantially in contact with the outer wall of the rotating drum. It is good to do.
Moreover, you may contact | abut in the state which the vertex of the spherical body provided in the rotating drum outer wall, the inner wall of a cover body, and / or the inner wall of a case substantially contacts. Here, when the sphere is fixedly provided, it is interpreted as the above-described protrusion.
Of course, the form of the interposition of the sphere and the contact of the apex is not limited to this. Further, a guide means such as a groove or a protrusion may be formed at a portion where the sphere is substantially in contact with the rotating drum so that the rotation trajectory of the rotating drum can be made constant.

The shape and depth of the recess for loosely fitting the sphere are not particularly limited, but the rotating drum is fitted to the shaft, and the position of the outer wall of the rotating drum and the inner wall of the lid and / or the inner wall of the case is When it is decided, the sphere must not be removed from the dent. The number of intervening spheres is not particularly limited, but it is preferably formed at three locations so that they can be supported at three points. Of course, the shape of the protrusions or protrusions and the number of the protrusions or protrusions are not limited thereto.
Also, when the sphere is fitted into the recess, the position of the outer wall of the rotating drum and the inner wall of the lid and / or the inner wall of the case is determined after the sphere is fitted into the recess, or the outer wall of the rotating drum The spherical body may be fitted into the recess after determining the position of the inner wall of the lid and / or the inner wall of the case. In the latter case, since the sphere is fitted in a press-fitted state, it is preferable to use a material having appropriate elasticity as the material used for forming the rotating drum.

Then, when two or more friction reducing means are provided, each of them or an appropriate one may be formed of different materials. As a specific example, when the above-described protrusions, protrusions, or spheres are provided on the outer wall of the rotating drum and the inner wall of the lid and / or the inner wall of the case, respectively, the outer wall of the rotating drum and the inner wall and / or the case of the lid Different materials are used for the inner wall of the material, such as resin materials (nylon / ABS) with different friction coefficients, resin materials, metal materials, etc. May be.
In addition, when two or more friction reducing means are provided, an appropriate shape, for example, an interposition member such as an annular body may be provided between each of them or between appropriate ones.

Further, the friction reducing means, that is, the bearing member / protrusion or the protrusion / sphere, is formed on the outer side wall of the rotating drum and / or the inner wall of the lid and / or one side of the inner wall of the case (the respective half cases are combined. Even if it is provided so that it is located on one side of the case based on the case, it is better to provide it on both sides of the case.
Further, an appropriate friction reducing means made of metal or resin may be provided between the inner wall of the second lid body and / or the inner wall of the case and the rotating drum. This is the same as the description of the embodiment in which friction reducing means is provided between the inner wall of the body and / or the inner wall of the case and the rotating drum.

Therefore, in the tape measure of the present invention, the shaft is installed (standing) in the case by attaching the lid to the opening of the case, so that the shaft can be installed in the case in any process of assembly work.
In addition, when the lid is transparent or translucent, the arrangement (attachment) state of each mechanism portion in the case can be confirmed visually.

  Since the tape measure of this invention is comprised as mentioned above, the installation of the axis | shaft in a case (stand-up) can be performed in any process of an assembly operation. That is, the shaft can be erected at the time when the process of setting the rotating drum is entered. Therefore, the shaft does not protrude until the rotating drum is set as in the conventional case. Therefore, the shaft is not damaged, and when the shaft is replaced for any reason, the lid Since the shaft is also replaced simply by replacing the shaft, there is little economic loss, and the shaft can be replaced without much effort.

And since the inside of a case can be visually observed if the lid is transparent or translucent, the set state on the shaft of the rotating drum can be confirmed visually together with the operation. As a result, defects caused by attachment that has conventionally occurred after the tape measure has been used can be extracted in-house, so that the rate of occurrence of defects outside the company can be reduced. In particular, the apparatus provided with the friction reducing means has a very high effect because it must be set more accurately on the shaft of the rotating drum. In addition, more accurate work can be performed when setting the rotating drum.

The tape measure of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the tape measure according to the present invention. 1 is a tape measure, 2 is a case, 3 is an opening formed on the side wall of the case 2, and 4 is an opening 3 5 is a shaft erected in the lid 4, 51 is a slit in which the end of the coil winding coil spring is engaged, 9 is a tape inlet / outlet, and 10 is a tape stop. It is a braking lever.
FIG. 2 is a partial cross-sectional front view of the case. The case 2 includes half cases 21 and 22. The lid 4 is fitted into the opening 3 formed in the half case 22, and the shaft 5 is installed in the case 2. The tip of the shaft 5 is fitted and supported by a bearing 6 formed on the inner wall of the half case 21.
FIG. 3 is a partially enlarged view showing an example of the state of engagement of the lid, and in this figure, the protrusion 41 formed on the lid 4 is fitted into the recess 221 formed on the opening 3 surface of the half case 22. To do.

FIG. 4 is a perspective view of a tape measure, which is a view of the opposite side of the case 2 of FIG. DESCRIPTION OF SYMBOLS 1 is a tape measure, 2 is a case, 7 is the 2nd opening formed in the side wall of case 2, 8 is the 2nd cover body fitted to the 2nd opening 7, 81 is an axis | shaft standing upright on the cover body 4 Reference numeral 5 denotes a bearing fitted to the tip of the reference numeral 5, 9 denotes a tape inlet / outlet, and 10 denotes a brake lever for stopping the tape from being drawn.
FIG. 5 is a partial cross-sectional front view of the case of FIG. 4, and the second lid 8 is fitted in the second opening 7 formed in the half case 21, and the second lid 8 The formed bearing 81 is fitted to the tip of the shaft 5 standing on the lid 4. And although an example of the engagement state of the 2nd opening 7 and the 2nd cover body 8 is not shown, you may make it the form shown in FIG.

6, 7, and 8 are side views showing a shaft having friction reducing means. FIG. 6 shows a bush 11 provided at the base of the shaft 5 as friction reducing means, and FIG. 7 shows a bearing member as friction reducing means. 12 is provided at the base of the shaft 5, and FIG. 8 is provided with a protrusion 13 at the base of the shaft 5 as a friction reducing means.
Further, the right diagrams shown in FIGS. 6/7/8 show the fitting states of the respective friction reducing means (bush 11 / bearing member 12 / projection 13) and the rotary drum 16. FIG.

FIG. 9 is a diagram showing a set state of the shaft having the friction reducing means and the rotating drum,
(A) In the figure, the lid 4 provided with the bearing member 12 at the base of the shaft 5 is fitted into the opening 3 of the half case 22, and the tip of the shaft 5 is fitted to the bearing 6 formed on the inner wall of the half case 21. It is. One of the rotating drums 16 is fitted to the bearing member 12 and the other is fitted to the bearing 6.
(B) In the figure, the lid 4 provided with the bearing member 12 at the base of the shaft 5 is fitted into the opening 3 of the half case 22, and the second lid 8 having a bearing 81 formed on the inner wall is the half case. 21 is fitted into the second opening 7 of the shaft 21, and the tip of the shaft 5 is fitted into a bearing 81 formed in the second lid 8. One of the rotating drums 16 is fitted to the bearing member 12 and the other is fitted to the bearing 81.

FIG. 10 is a side view showing a form having a friction reducing means on the shaft and the inner wall of the lid,
In this figure, a bearing member 12 is provided at the base of the shaft 5 as friction reducing means, and a projection 15 is provided on the inner wall of the lid 4 as friction reducing means. Although not shown, the protrusion 15 may be formed on the opposite case (half case 21). In addition, the second lid 8 that fits into the second opening 7 of the opposite case (half-case 21) may be formed on the inner wall of the second lid 8.
The right figure shows a state in which the bearing member 12 and the protrusion 15 are engaged with the rotary drum 6. The rotary drum 16 is fitted into the bearing member 12, and the side wall of the rotary drum 16 is in contact with the protrusion 15.

  FIG. 11 is a side view showing a configuration having friction reducing means on the shaft and the inner wall of the case. In this figure, a metal 14 is provided at the base of the shaft 5 as friction reducing means, and a projection 15 is provided as friction reducing means. It is provided on the inner wall of the half case 22. Although not shown, the protrusion 15 may be formed on the opposite case (half case 21).

FIG. 12 is a view showing a configuration having friction reducing means on both sides of the shaft. 21/22 is a half case, 4 is a lid body fitted into the opening 3, and 5 is standing in the lid body 4. A shaft 51 is a slit to which an end of a coil winding coil spring is engaged, 16 is a rotating drum, and both side walls of the rotating drum 16 are fitted to bearing members 12 at both ends of the shaft 5.
Reference numeral 17 denotes a coil spring for winding the measuring tape 18, and reference numeral 171 denotes an end of the coil spring 17, which is engaged with the slit 51 of the shaft 5. Reference numeral 18 denotes a measuring tape.
(A) The figure shows a bearing member 12 as friction reducing means provided at the tip of the shaft 5 together with the base portion of the shaft 5 standing on the lid 4. The bearing member 12 at the tip of the shaft 5 is fixed to the inner wall of the case 21. Of course, it may be fixedly fitted to the shaft 5.
(B) The figure shows that the bearing member 12 as friction reducing means is provided on the inner wall (bearing 81) of the second lid 8 together with the base portion of the shaft 5 standing on the lid 4.

FIG. 13 is a diagram illustrating an installation example of friction reducing means between the shaft and the rotating drum.
(A) The figure uses a bush 11 whose opening edge rises as friction reducing means, between the base of the shaft 5 and the rotating drum 16, and between the side wall of the rotating drum 16 and the inner wall of the lid 4. Intervene in.
(B) The figure uses a bearing member 12 as friction reducing means, and is interposed between the base of the shaft 5 and the rotating drum 16.
(C) The figure uses a metal member 14 as friction reducing means, and is interposed between the base of the shaft 5 and the rotating drum 16.
(D) In the figure, one metal member is used as the friction reducing means. This metal member is a ring-shaped 141 having a substantially circular cross section, and is located between the base of the shaft 5 and the rotating drum 16. Intervene.
(E) In the figure, one metal member is used as a friction reducing means, but this metal member is composed of two outer ring A and inner ring B which are slidable. The two-layer type 142 is interposed between the base of the shaft 5 and the rotary drum 16.

(F) In the figure, the protrusion 13 is used as the friction reducing means, and the protrusion 13 is formed on the rotating drum 16. The protrusion 13 is interposed between the base portion of the shaft 5 and the rotary drum 16.
(G) In the figure, a protrusion 13 is used as a friction reducing means, and the protrusion 13 is formed at the base of the shaft 5. The protrusion 13 is interposed between the base portion of the shaft 5 and the rotary drum 16.
(H) In the figure, the protrusion 13 is used as the friction reducing means, the protrusion 13 is formed on the holding member C, and the holding member C is provided on the rotating drum 16. The protrusion 13 has a shaft 5
Between the base and the rotating drum 16.
(I) In the figure, the protrusion 13 is used as a friction reducing means, the protrusion 13 is formed on the holding member C, and the holding member C is provided at the base of the shaft 5. The protrusion 13 is indirectly interposed between the base of the shaft 5 and the rotating drum 16.

(J) In the figure, a sphere 19 is used as the friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the rotary drum 16. The sphere 19 is interposed between the base of the shaft 5 and the rotating drum 16.
(K) In the figure, a sphere 19 is used as the friction reducing means, and the sphere 19 is loosely fitted in the recess 20 at the base of the shaft 5. The sphere 19 is interposed between the base of the shaft 5 and the rotating drum 16.
(L) In the figure, a sphere 19 is used as the friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the rotary drum 16 and the recess 20 of the base of the shaft 5. The sphere 19 is interposed between the base of the shaft 5 and the rotating drum 16.
(M) A sphere 19 is used as friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the holding member C, and the holding member C is provided on the rotating drum 16. The sphere 19 is indirectly interposed between the base of the shaft 5 and the rotating drum 16.
(N) A sphere 19 is used as friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the holding member C, and the holding member C is provided at the base of the shaft 5. The sphere 19 is indirectly interposed between the base of the shaft 5 and the rotating drum 16.

(O) In the figure, a protrusion 13 is used as a friction reducing means, and the protrusion 13 is formed on the rotating drum 16 and the base of the shaft 5. The protrusion 13 is interposed between the base portion of the shaft 5 and the rotary drum 16.
(P) In the figure, two spheres 19 are used as friction reducing means, one sphere 19 is loosely fitted in the dent 20 of the rotary drum 16, and the other sphere 19 is loosely fitted in the dent 20 at the base of the shaft 5. An interposition member D is interposed between the spheres 19. The sphere 19 is indirectly interposed between the base of the shaft 5 and the rotating drum 16.
In the drawing (q), bearing members 12 of friction reducing means are provided at both ends of the shaft 5. The installation form is the same as in FIG.
(R) The figure shows that the bushes 11 of the friction reducing means are provided at both ends of the shaft 5. The installation form is the same as in FIG.
(S) The figure has shown what provided the processus | protrusion 13 in the rotating drum 16 like three-point support.
(T) The figure shows the ball 19 loosely fitted to the rotary drum 16 in a three-point support form.

FIG. 14 is a diagram showing an installation example of friction reducing means between the inner wall of the lid and the rotating drum.
(A) The figure uses the bearing member 12 as a friction reducing means, and is interposed between the inner wall of the lid 4 and the rotating drum 16.
(B) The figure is the figure which looked at (a) figure from the top, and is seeing through the rotary drum 16 seeing through. The bearing member 12 is provided with a cylindrical bearing 121 radially, and is installed around the base portion of the shaft 5.

(C) In the figure, a protrusion 13 is used as a friction reducing means, and the protrusion 13 is formed on a rotating drum 16. The protrusion 13 is interposed between the inner wall of the lid 4 and the rotating drum 16.
(D) The figure uses the protrusion 13 as friction reducing means, and the protrusion 13 is formed on the inner wall of the lid 4. The protrusion 13 is interposed between the inner wall of the lid 4 and the rotating drum 16.
(E) In the figure, a protrusion 13 is used as a friction reducing means, and the protrusion 13 is formed on a rotary drum 16, and the protrusion 13 is engaged with a recess 20 on the inner wall of the lid 4. The protrusion 13 is interposed between the inner wall of the lid 4 and the rotating drum 16.
(F) In the figure, the protrusion 13 is used as the friction reducing means, the protrusion 13 is formed on the holding member C, and the holding member C is provided on the rotating drum 16. The protrusion 13 is indirectly interposed between the inner wall of the lid 4 and the rotating drum 16.
(G) In the figure, the protrusion 13 is used as the friction reducing means, the protrusion 13 is formed on the holding member C, and the holding member C is provided on the inner wall of the lid 4. The protrusion 13 is indirectly interposed between the inner wall of the lid 4 and the rotating drum 16.

(H) In the figure, a sphere 19 is used as the friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the rotary drum 16. The sphere 19 is interposed between the inner wall of the lid 4 and the rotating drum 16.
(I) In the figure, a sphere 19 is used as a friction reducing means, and the sphere 19 is loosely fitted in a recess 20 on the inner wall of the lid 4. The sphere 19 is interposed between the inner wall of the lid 4 and the rotating drum 16.
(J) In the figure, a sphere 19 is used as friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the rotary drum 16 and the recess 20 of the inner wall of the lid body 4. The sphere 19 is interposed between the inner wall of the lid 4 and the rotating drum 16.
(K) In the figure, a sphere 19 is used as the friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the holding member C, and the holding member C is provided on the rotary drum 16. The sphere 19 is indirectly interposed between the inner wall of the lid 4 and the rotary drum 16.
(L) In the figure, a sphere 19 is used as the friction reducing means, and the sphere 19 is loosely fitted in the recess 20 of the holding member C, and the holding member C is provided on the inner wall of the lid 4. The sphere 19 is indirectly interposed between the inner wall of the lid 4 and the rotary drum 16.

(M) In the figure, a protrusion 13 is used as a friction reducing means, and the protrusion 13 is formed on the rotary drum 16 and the inner wall of the lid 4. The protrusion 13 is interposed between the inner wall of the lid 4 and the rotating drum 16.
(N) In the figure, two spheres 19 are used as friction reducing means, one sphere 19 is loosely fitted in the recess 20 on the inner wall of the lid 4, and the other sphere 19 is loosely fitted in the recess 20 of the interposition member D. The interposition member D is interposed between the rotary drum 16 and the inner wall of the lid 4. The sphere 19 is indirectly interposed between the inner wall of the lid 4 and the rotary drum 16.
(O) In the figure, bearing members 12 of friction reducing means are provided on both sides of the rotary drum 16. The installation form is the same as in FIG.
(P) The figure uses two bearing members 12 of friction reducing means, and is interposed between the inner wall of the lid 4 and the rotating drum 16.
(Q) The figure has shown what provided the processus | protrusion 13 in the inner wall of the cover body 4 in the shape of 3 point | piece support.
(R) The figure has shown the thing which loosely fits the ball | bowl 19 on the inner wall of the cover body 4 in the shape of 3 point support.

FIG. 15 is a diagram showing an installation example of friction reducing means between the shaft and the rotating drum and the inner wall of the lid and the rotating drum.
(A) The figure uses a bearing member 12 as friction reducing means, and the bearing member 12 is interposed between the base of the shaft 5 and the rotary drum 16, and between the inner wall of the lid 4 and the rotary drum 16. .
(B) In the figure, the metal member 14 and the bearing member 12 are used as friction reducing means. The metal member 14 rotates between the base of the shaft 5 and the rotary drum 16, and the bearing member 12 rotates with the inner wall of the lid 4. It is interposed between the drum 16.

(C) In the figure, two protrusions 13 are used as friction reducing means, one protrusion 13 is formed on the rotating drum 16, and the other protrusion 13 is formed on the inner wall of the lid 4. The protrusion 13 is interposed between the base of the shaft 5 and the rotary drum 16 and between the inner wall of the lid 4 and the rotary drum 16.
(D) In the figure, two spheres 19 are used as friction reducing means, one sphere 19 is loosely fitted in the dent 20 of the rotary drum 16, and the other sphere 19 is loosely fitted in the dent 20 on the inner wall of the lid 4. ing. The sphere 19 is interposed between the base of the shaft 5 and the rotary drum 16 and between the inner wall of the lid 4 and the rotary drum 16.
(E) In the figure, the protrusion 13 and the sphere 19 are used as friction reducing means, the protrusion 13 is formed on the rotating drum 16, and the sphere 19 is loosely fitted in the recess 20 on the inner wall of the lid 4. The protrusion 13 is interposed between the base of the shaft 5 and the rotating drum 16, and the ball 19 is interposed between the inner wall of the lid 4 and the rotating drum 16.

(F) The figure uses two projections 13 as friction reducing means, one projection 13 is formed on the holding member C, the holding member C is provided at the base of the shaft 5, and the other projection 13 is provided on the holding member C. The holding member C is formed on the inner wall of the lid 4. The protrusions 13 are indirectly interposed between the base of the shaft 5 and the rotating drum 16 and between the inner wall of the lid 4 and the rotating drum 16.
(G) In the figure, two spheres 19 are used as friction reducing means, one sphere 19 is loosely fitted in the recess 20 of the holding member C, the holding member C is provided on the rotating drum 16, and the other sphere 19 is held. The holding member C is loosely fitted in the recess 20 of the member C, and is provided on the inner wall of the lid 4. The sphere 19 is indirectly interposed between the base of the shaft 5 and the rotary drum 16 and between the inner wall of the lid 4 and the rotary drum 16.

  (H) In the figure, the bush 11 and the protrusion 13 whose opening edge rises are used as friction reducing means. The bush 11 is interposed between the base of the shaft 5 and the rotating drum 16, and the protrusion 13 is formed on the holding member C, and the holding member C is provided on the inner wall of the lid 4. The bush 11 is interposed between the base of the shaft 5 and the rotary drum 16 and between the inner wall of the lid 4 and the rotary drum 16, and the protrusion 13 is indirectly between the inner wall of the lid 4 and the rotary drum 16. Intervene.

  (I) The figure shows a sphere 19 as friction reducing means, two for reducing friction between the base of the shaft 5 and the rotating drum 16, and a friction reducing between the inner wall of the lid 4 and the rotating drum 16. Two are used for the purpose. For reducing friction between the base of the shaft 5 and the rotary drum 16, one ball 19 is loosely fitted in the recess 20 of the rotary drum 16, and the other ball 19 is loosely fitted in the recess 20 of the base of the shaft 5. The interposition member D is interposed between the spheres 19. The sphere 19 is indirectly interposed between the base of the shaft 5 and the rotating drum 16. In order to reduce friction between the inner wall of the lid 4 and the rotary drum 16, one sphere 19 is loosely fitted in the dent 20 on the inner wall of the lid 4, and the other sphere 19 is dent 20 in the interposition member D. The interposition member D is interposed between the inner wall of the lid body 4 and the rotary drum 16. The ball 19 is indirectly interposed between the inner wall of the lid 4 and the rotary drum 16.

(J) shows that the bearing members 12 of the friction reducing means are provided on both ends of the shaft 5 and on both sides of the rotary drum 16. The installation form is the same as in FIG.
(K) The figure shows the projection 13 provided on the rotary drum 16 in a three-point support manner and the projection 13 provided on the inner wall of the lid 4 in a three-point support manner.
Shows what it is.
(L) The figure shows that the ball 19 is provided on the rotary drum 16 in a three-point support form, and the protrusion 131 is provided on the inner wall of the lid 4 in a three-point support form.

The perspective view of the tape measure which concerns on this invention Partial cross-sectional front view of the case Partially enlarged view showing an example of the engagement state of the lid Perspective view of tape measure 4 is a partially sectional front view of the case of FIG. Side view showing shaft with friction reducing means Side view showing shaft with friction reducing means Side view showing shaft with friction reducing means The figure which shows the set state of the axis | shaft which has a friction reduction means, and a rotating drum The side view which shows the form which has a friction reduction means in the shaft and the lid body wall Side view showing a form having friction reducing means on the shaft and the inner wall of the case The figure which shows the form which has a friction reduction means on both sides of a shaft The figure which shows the example of installation of the friction reduction means between a shaft and a rotating drum The figure which shows the example of installation of the friction reduction means between the inner wall of a cover body, and a rotating drum The figure which shows the example of installation of the friction reduction means between a shaft, a rotating drum, and the inner wall of a cover body, and a rotating drum

Explanation of symbols

1- tape measure, 2-case, 21 / 22-half case, 221- recess, 3-opening, 4-lid body, 41-projection, 5-axis, 51-slit, 6-bearing, 7-second Opening, 8-second cover, 81-bearing, 9-tape doorway, 10-braking lever, 11-bushing, 12-bearing member, 121-bearing, 13-projection, 131-projection, 14-metal member , 141-ring type, 142-layer type, 15-protrusion, 16-rotating drum, 17-coil spring, 171-end, 18-tape, 19-ball, 20-recess, A-outer ring, B-inner ring , C-holding member, D-intervening member

Claims (9)

In the case, in measuring tape urging means for urging in a direction winding the winding and the tape around the tape for supporting the rotary drum is decorated, the opening is provided in a predetermined side wall of the case, also the opening A tape measure comprising a lid for closing, wherein the lid is provided with a shaft for supporting the rotary drum in advance before being attached to the opening. A second opening is provided in a side wall of the case facing the tip of the shaft, and a bearing that supports the tip of the shaft is provided in a second lid that can be fitted into the second opening. The tape measure of claim 1   2. A tape measure according to claim 1, wherein an appropriate friction reducing means is provided between the shaft and the rotating drum. 2. A tape measure according to claim 1, wherein an appropriate friction reducing means is provided between the inner wall of the lid and the rotary drum. The tape measure according to claim 1, wherein an appropriate friction reducing means is provided between the inner wall of the lid and the inner wall of the case and the rotary drum. The tape measure according to claim 2, wherein an appropriate friction reducing means is provided between the inner wall of the second lid and the rotary drum. The tape measure according to claim 2, wherein an appropriate friction reducing means is provided between the inner wall of the second lid and the inner wall of the case and the rotating drum. 2. The tape measure according to claim 1, wherein the lid body can be seen through the case. 3. The tape measure according to claim 2, wherein the second lid body can be seen through the case.

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