JP7269426B2 - display cover - Google Patents

Description

The present invention relates to a display cover attachable to a measuring instrument. The measuring instrument is of a type pointing to the scale provided with a scale plate on which the scale is displayed, a pointer that rotates on the scale plate around a rotation axis to point to the scale, and a front cover that covers these. It is typically a pointer display type dial gauge.

A pointer display type dial gauge is a measuring instrument that uses a pointer and a scale to indicate the error of the external dimensions of the object to be measured against a reference value. Two limit hands are provided for clarity. These two limit hands are configured, for example, to be movable along the entire circumference of an outer frame ring provided around a transparent cover that covers the hands and scale plate. Therefore, for example, when the operator's hand or the like touches the limit hand while using the dial gauge, the position of the limit hand may be erroneously displaced. Moreover, since only one predetermined width can be specified with two limit hands, it is difficult to indicate, for example, a plurality of allowable ranges.

Therefore, for example, a "limit range display sticker for dial gauge scale" disclosed in Patent Document 1 below has been devised. This display sticker is a ring-shaped sheet with a notch attached to the transparent cover of the dial gauge. As a result, it is possible to clearly indicate, for example, a plurality of allowable ranges for the scale of the scale plate. Even if you touch it, it will not peel off or move easily. Therefore, in place of the limit needle, it is possible to flexibly specify the allowable limit value of the dimensional error. It is also possible to indicate a plurality of allowable ranges and the like.

Japanese Utility Model Laid-Open No. 57-114902

However, the display sticker of Patent Document 1 is attached to the transparent cover of the dial gauge by the adhesive layer on the back side, so if the adhesive strength of the adhesive layer is weak, it may be peeled off during operation. There is Also, if the adhesive strength is too strong, the display sticker will be difficult to peel off, which may pose a problem in the operation of replacing the display sticker when, for example, the object to be measured by the dial gauge is changed. In addition, if the work space in which the dial gauge is used contains a misty lubricant or the like, the adhesive strength of the indicator sticker may be weakened and the indicator sticker may be easily peeled off.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display cover capable of indicating the allowable range of dimensional error and the like at a plurality of locations.

In order to achieve the above object, the technical means of claim 1 described in the scope of claims are adopted. According to this measure, the display cover of claim 1 comprises an annular portion. The annular portion has an annular shape whose inner diameter is slightly larger than that of the front cover of the measuring instrument and which can be attached to the outer periphery of the front cover. A display surface is provided on the end surface on the one end side in the axial direction located on the side of the transparent portion when attached to the front cover. A plurality of linear concave portions or linear convex portions are arranged on the display surface, and the linear concave portions or linear convex portions are arranged at the same interval as the scale of the scale plate of the measuring instrument to which the annular portion is mounted. are arranged in the circumferential direction of the torus. As a result, it is possible to display, for example, judgment information, such as the quality of the scale indicated by the needle of the measuring instrument, in a plurality of locations using colors, characters, or the like. In addition, since the display surface has linear recesses and linear projections at positions corresponding to the scales of the measuring instrument, these obstruct the flow of liquid such as liquid ink for coloring. Therefore, for example, when coloring judgment information such as quality of the scale indicated by the needle of the measuring instrument with a marker pen, felt pen, etc., the ink for coloring is sandwiched between the linear concave portions and linear convex portions. Easier to stay in range.

Also, the technical means of claim 2 described in the scope of claims is adopted. According to this means, a plurality of engaging claws that can be engaged with the front cover are provided on the other axial end side of the annular portion located axially opposite to the one axial end side of the annular portion. . The plurality of engaging claws, for example, may be engaged with the front cover in the radial direction, or may be engaged with the front cover in the radial direction. As a result, when the annular portion is attached to the front cover of the measuring instrument, these hooking claws can be engaged with the stepped portions at the corners of the outer periphery of the front cover, thereby facilitating attachment of the display cover. becomes possible. In addition, the display cover mounted around the front cover in this way can be disengaged from the front cover by, for example, applying a force to the engaging claws in a direction in which the engaging claws are not engaged by a worker or the like. , the display cover can be easily removed from the front cover.

Also, the technical means of claim 3 described in the scope of claims is adopted. According to this means, the blind portion that covers part of the scale of the scale plate is provided in the inner diameter direction (inner diameter side) of the annular portion. As a result, for example, a scale portion that exceeds the expected range of the scale indicated by the pointer of the measuring instrument (a scale portion outside the expected range) can be covered with the blindfold portion.

Also, the technical means of claim 4 described in the scope of claims is adopted. According to this means, the display surface portion is located on the other axial end side of the annular portion located on the opposite side of the annular portion in the axial direction with respect to the one axial end side of the annular portion. It also has a display surface extending in the axial direction and capable of displaying information such as characters, symbols or graphics. This makes it possible to display information such as characters, symbols, or graphics on the display surface as information about the display cover, information about the measuring instrument to which the display cover is attached, and the like.

In the first aspect of the invention, it is possible to display, for example, judgment information such as the quality of the scale indicated by the needle of the measuring instrument in a plurality of locations on the display surface of the annular portion, using colors, characters, and the like. Therefore, the allowable range of dimensional error and the like can be specified at a plurality of locations. In addition, since it is possible to suppress the ink from oozing out during coloring, it is possible to clearly and accurately apply different colors according to the scale of the scale plate of the measuring instrument.

According to the invention of claim 2, when the annular portion is attached to the front cover of the measuring instrument, these hooking claws can be engaged with the stepped portions at the corners of the outer periphery of the front cover, so that the display cover can be easily removed. can be attached to the In addition, the display cover mounted around the front cover in this way can be disengaged from the front cover by, for example, applying a force to the engaging claws in a direction in which the engaging claws are not engaged by a worker or the like. , the display cover can be easily removed from the front cover.

According to the invention of claim 3, for example, it is possible to cover the scale portion that exceeds the expected range of the scale indicated by the needle of the measuring instrument (the scale portion outside the expected range) with the blindfold portion. Therefore, since the operator does not have to visually care about the scale portion outside the expected range, the operator can pay attention to the pointer pointing to the scale within the expected range and the scale, thereby improving work efficiency. can be improved. In addition, information such as characters, symbols, or graphics can be displayed on the front side of such a blindfold (the surface that can be visually recognized by the operator when attached to the measuring instrument).

In the fourth aspect of the present invention, it is possible to display information such as characters, symbols, or graphics on the display surface as information about the display cover, information about the measuring instrument to which the display cover is attached, and the like. Therefore, the operator can confirm information about the display cover and the measuring instrument to which it is attached by viewing such information.

FIG. 5 is an explanatory diagram showing an example of a state in which the dial gauge cover according to the reference example of the present invention is attached to the dial gauge; FIG. 1(A) is a view of the dial gauge viewed from the front direction, and FIG. 1(B) is a view including a partial cross section viewed from the direction of arrow 1B shown in FIG. 1(A). It is a figure which shows the structural example of the dial gauge cover of this reference example. Fig. 2(A) is a front view, Fig. 2(B) is a rear view, Fig. 2(C) is a right or left side view, Fig. 2(D) is the direction of the 2D line arrow shown in Fig. 2(B) 1 is a cross-sectional view seen from . FIG. 3 is an explanatory diagram showing a usage example of the dial gauge cover shown in FIG. 2; FIG. 3(A) is a diagram showing the state before the judgment information is displayed, and FIG. 3(B) is a diagram showing the state after the judgment information is displayed. FIG. 8 is a diagram showing another configuration example (another reference example) of the dial gauge cover of this reference example; 4(A) is a front view, FIG. 4(B) is a rear view, FIG. 4(C) is a plan view, FIG. 4(D) is a bottom view, FIG. 4(E) is a right or left side view, FIG. 4(F) is a cross-sectional view seen from the direction of arrow 4F shown in FIG. 4(B), and FIG. 4(G) is an enlarged cross-sectional view of the display surface portion. FIG. 5 is an explanatory diagram showing a usage example of the dial gauge cover shown in FIG. 4; FIG. 5(A) is a diagram including a partial cross section showing a state in which the dial gauge cover is attached to the dial gauge, and FIG. 5(B) is a diagram showing the state after judgment information and model number information are displayed. FIG. 4 is a diagram showing a configuration example of a dial gauge cover according to one embodiment of the present invention; Fig. 6(A) is a front view, Fig. 6(B) is a rear view, Fig. 6(C) is a right or left side view, Fig. 6(D) is the direction of arrow 6D shown in Fig. 6(B). 1 is a cross-sectional view seen from . 7 is an explanatory diagram showing an example of a state in which the dial gauge cover shown in FIG. 6 is attached to the dial gauge; FIG. 7(A) is a view of the dial gauge viewed from the front direction, and FIG. 7(B) is a view including a partial cross section viewed from the direction of arrow 7B shown in FIG. 7(A). FIG. 10 is a diagram showing another configuration example (modified example 1) of the dial gauge cover of the present embodiment; 8(A) is a front view, FIG. 8(B) is a rear view, FIG. 8(C) is a right or left side view, and FIG. 8(D) is the direction of the arrow 8D shown in FIG. 8(B). 1 is a cross-sectional view seen from . FIG. 9 is an explanatory diagram showing an example of a state in which the dial gauge cover shown in FIG. 8 is attached to the dial gauge; 9(A) is a view of the dial gauge viewed from the front direction, and FIG. 9(B) is a view including a partial cross section viewed from the direction of arrow 9B shown in FIG. 9(A). FIG. 10 is a diagram showing another configuration example (modified example 2) of the dial gauge cover of the embodiment; 10(A) is a front view, FIG. 10(B) is a rear view, FIG. 10(C) is a right or left side view, and FIG. 10(D) is the direction of arrow 10D shown in FIG. 10(B). 1 is a cross-sectional view seen from .

[Reference example]
Before describing the display cover of the present invention, an example in which the dial gauge cover of the reference example is attached to a dial gauge as a measuring instrument and used will be described with reference to the drawings. First, a configuration example of the dial gauge 10 will be briefly described with reference to FIG. FIGS. 1A and 1B show a front view of the dial gauge 10 (FIG. 1(A)) and FIG. A view (FIG. 1(B)) including a partial cross section viewed from the direction of arrow 1B shown in A) is illustrated.

As shown in FIGS. 1(A) and 1(B), the dial gauge 10 mainly includes a body case 11, a stem 12, a spindle 13, a probe 14, a display section 15, an outer frame ring 16, and an outer frame clamp. 17, a cap 18, etc., and the spindle 13 protrudes freely in and out of the body case 11 through the stem 12 fixed to the body case 11. A spindle that can accurately measure the movement (protrusion amount) as a linear distance. It is a dial gauge of the formula. Typically, it is used, for example, in the inspection process of machine parts, etc., when measuring the dimensional error of an object to be measured with respect to a master that serves as a reference for external dimensions.

The spindle 13 is provided with a probe 14 that can come into contact with the object to be measured at its tip, and has a rack and pinion mechanism (not shown) that converts the linear motion of the spindle 13 into rotary motion at its rear end. An expansion transmission mechanism is provided to expand the movement of the rack gear. The pinion gear is connected to the pointer 15d of the display section 15 via an expansion transmission mechanism. These mechanisms are housed inside the body case 11 . A cap 18 is attached to the body case 11 to prevent the rear end of the spindle 13 from being exposed to the outside when it protrudes from the body case 11 .

The display unit 15 includes a scale plate 15a having an annular shape and a scale 15b displayed in the circumferential direction, a pointer 15d rotating on the scale plate 15a around a rotation shaft 15c and pointing to the scale 15b, and a scale. A transparent cover 15e having a disk shape with a larger diameter and thickness than the plate 15a and covering at least the scale 15b and the pointer 15d so as to be visible from the outside is provided. The rotary shaft 15c is connected to the pinion gear via the aforementioned expansion transmission mechanism or the like, and is configured to rotate the pointer 15d in accordance with the amount of movement of the spindle 13. As shown in FIG. Reference numeral 15f indicates the outer peripheral edge of the transparent cover 15e.

An outer frame ring 16 in which a plurality of spline-shaped grooves (hereinafter referred to as “spline grooves”) are formed along the entire circumference is provided on the outer periphery of the display section 15 . The outer frame ring 16 is rotatable in the circumferential direction together with the scale plate 15a and the transparent cover 15e of the display unit 15, and the zero position of the scale plate 15a (the position of the scale 15b) is adjusted at an arbitrary rotation position of the pointer 15d. It is configured so that 0 (zero) point alignment can be performed. In the dial gauge 10, the scale plate 15a, the transparent cover 15e and the outer frame ring 16 are mechanically integrally formed, and are detachable from the body case 11 by operating the outer frame clamp 17. As shown in FIG. The zero alignment is performed by an operator turning the outer frame ring 16 so that 0 (zero) on the scale 15b is aligned with the position pointed by the pointer 15d during the measurement of the master.

The dial gauge 10 configured in this manner is used by being held by a stand 50, for example. The stand 50 is, for example, a measurement aid that is placed or attached on a work table to support and fix the dial gauge 10, and the stem 12 of the dial gauge 10 is clamped by a clamp 52 that opens and closes by operating a clamp knob 53. It is sandwiched and supported by the bracket 51 . It should be noted that FIG. 1 does not show a support shaft or a base for holding the bracket 51 of the stand 50 .

Next, the construction of the dial gauge cover 20 of the reference example will be described with reference to FIGS. 1 and 2. FIG. 2(A) is a front view of the dial gauge cover 20, FIG. 2(B) is a rear view of the same, FIG. 2(C) is a right or left side view of the same, and FIG. 2(D) is a diagram. 2(B) are cross-sectional views of the dial gauge cover 20 viewed from the direction of the 2D line arrow. It should be noted that from these figures, the external shape of the dial gauge cover 20 can be understood as the design of the article "display cover" related to the design. The side view of the dial gauge cover 20 shown in FIG. A plan view and a bottom view also appear in the same manner as the side view of FIG. 2(C).

The dial gauge cover 20 is composed of an annular portion 21 and a display surface portion 22 . These are, for example, integrally molded from a synthetic resin such as polypropylene, ABS resin, or polycarbonate. In addition, it may be molded from a special paper material that is excellent in water resistance and durability. In the reference example, at least the display surface portion 22 is made of a synthetic resin or paper material that becomes white after molding, for example, in order to allow coloring of any color (green, yellow, red, etc.) with an oil-based marker pen or the like. be. As will be described later, when a seal of an arbitrary color is attached instead of coloring with a permanent marker pen or the like, the color of the synthetic resin or paper material after molding may be other than white.

The annular portion 21 is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the outer frame ring 16 of the dial gauge 10 and having a short axial length. The axial length of the annular portion 21 is large enough to be attached to the outer frame ring 16 of the dial gauge 10, that is, it is longer than the axial length of the outer frame ring 16 and exists around the display portion 15 in the attached state. The length is set so as not to contact the outer frame clamp 17 or the cap 18 .

The peripheral wall (cylinder wall) of the annular portion 21 is set so that the plate thickness decreases from one end portion 21a of the annular portion 21 toward the other end portion 21b. The diameter is set to increase from the portion 21a toward the other end portion 21b (Dc→Dd (>Dc)). In the reference example, the peripheral wall of the annular portion 21 has a thickness of, for example, 1 mm at the thickest portion. The thickness of the peripheral wall is such that when the dial gauge 10 to which the dial gauge cover 20 is attached is held by the stand 50 or when the dial gauge cover 20 is attached to the dial gauge 10 held by the stand 50, the stem 12 is thick. 21 d of the annular portion 21 does not come into contact with the clamp 52 that holds the . That is, as shown in FIG. 1 , the peripheral wall of the annular portion 21 is set to have a plate thickness that allows it to fit into the gap SP between the outer peripheral surface 21 d of the annular portion 21 and the clamp 52 .

On the inner peripheral surface 21c of the annular portion 21, a plurality of protrusions 25 extend linearly in the axial direction (from one end portion 21a to the other end portion 21b of the annular portion 21 or in the opposite direction) at substantially equal intervals in the circumferential direction. formed in places. In the reference example, since the dial gauge cover 20 is attached to the outer frame ring 16 of the dial gauge 10, the width, height, and number of the protrusions 25 are determined based on the spline grooves formed in the outer frame ring 16. set. That is, the width of the projections 25 is slightly narrower than the width of the spline grooves of the outer frame ring 16, and the height is set slightly shallower (lower) than the depth of the spline grooves. , is set to the number of the same spline grooves divided by an integer.

For example, if the number of spline grooves of the outer frame ring 16 is 100, it may be set to 10, which is 1/10, or 5, which is 1/20. As a result, the spline grooves of the outer frame ring 16 and the projections 25 of the annular portion 21 can be meshed well with each other, so that the annular portion 21 is prevented from slipping in the circumferential direction with respect to the outer frame ring 16. The outer frame ring 16 and the annular portion 21 can be easily rotated integrally. In other words, by rotating the annular portion 21, the zero alignment operation can be performed.

In the reference example, as described above, the peripheral wall of the annular portion 21 is set so that the plate thickness becomes thinner from the one end portion 21a toward the other end portion 21b. Therefore, even if the height of the projection 25 is constant regardless of its longitudinal position, it functions like a wedge in which the height of the projection 25 increases from the other end 21b toward the one end 21a. That is, when the dial gauge cover 20 is attached to the outer frame ring 16, the fitting degree increases as the outer frame ring 16 fits into the one end portion 21a from the other end portion 21b of the annular portion 21 (the amount of fitting increases). The outer frame ring 16 is configured to be tightly fitted to the inner peripheral surface 21c via the protrusions 25 that function like wedges. As in the dial gauge cover 30 of another reference example which will be described later, even if the thickness of the peripheral wall of the annular portion 21 is constant and the convex portion 25 is formed in a wedge shape like the convex portion 35, the external Such fitting between the frame ring 16 and the annular portion 21 is obtained.

The peripheral wall of the annular portion 21 becomes thinner from the one end portion 21a to the other end portion 21b, so that the outside of the dial gauge 10 has the same degree of inclination or substantially the same degree of inclination as the convex portion 25 is inclined. When the frame ring 16 is reduced in diameter in the axial direction away from the scale plate 15a and approached the transparent cover 15e (expanded in the direction away from the transparent cover 15e and approached the scale plate 15a), the outer frame ring 16 can be fitted with a predetermined fitting degree at the deepest part of the penetration depth or in the vicinity thereof without fitting at the beginning or in the process of entering the annular part 21 .

Further, the thickness of the peripheral wall of the annular portion 21 and the height of the convex portion 25 may be constant. As described above, instead of setting the thickness of the peripheral wall of the annular portion 21 to decrease from the one end portion 21a toward the other end portion 21b, the thickness of the peripheral wall of the annular portion 21 is increased in the axial direction and It may be configured to be the same or substantially the same in the circumferential direction, and the height of the projection 25 may be the same or substantially the same regardless of its longitudinal position. As a result, for example, when the outer frame ring 16 of the dial gauge 10 has a constant outer diameter without contracting or expanding, the fitting amount by which the outer frame ring 16 is fitted into the annular portion 21 is calculated. It becomes possible to obtain a constant degree of fitting regardless of the

A display surface portion 22 extending like an eave in the inner diameter direction and the circumferential direction is formed at one end portion 21 a of the annular portion 21 . When the dial gauge cover 20 is attached to the outer frame ring 16 of the dial gauge 10, the display surface portion 22 covers the outer peripheral edge 15f of the transparent cover 15e of the display portion 15, and the tip portion 22a of the display surface portion 22 serves as the display portion. 15 scale 15b and the vicinity thereof. In the reference example, the display surface portion 22 inclines from one end portion 21a (base end portion 22b) of the annular portion 21 toward the tip portion 22a in the axial cross section so as to approach the surface of the transparent cover 15e of the dial gauge 10. ing. As a result, the distal end portion 22a approaches the scale 15b, so that it becomes easier to see the correspondence between the judgment information displayed on the display surface portion 22 and the scale 15b, and the display area of the display surface portion 22 increases. Therefore, more information can be displayed.

In the display surface portion 22, the closer the display position of the scale 15b of the dial gauge 10 is to the center of the scale plate 15a or the rotation shaft 15c, the wider the width that can be secured as the display surface portion 22. The width that can be secured as the display surface portion 22 becomes narrower as the distance from the drive shaft 15c increases. Therefore, in order to increase the displayable area of the display surface portion 22, it is necessary to expand the display surface portion 22 radially outward, which will be described later. In the reference example, the thickness of the base end portion 22b of the display surface portion 22 is set to 2 to 3 mm, and the thickness of the tip portion 22a is set to 0.5 mm. The inner diameter of the circular frame (the display surface portion 22 surrounding the scale 15b) surrounded by the tip portion 22a is Da, and the outer diameter of the annular portion 21, that is, the dial gauge cover 20 is Db.

The dial gauge cover 20 configured in this manner is used by coloring the display surface portion 22, which is not colored at all, with a permanent marker pen or the like as shown in FIG. 3(A). In the example of the dial gauge cover 20 shown in FIG. 3(B), the dimensional error judgment information 23a for a predetermined range centered on 0 (zero) of the scale 15b of the dial gauge 10 is "clearly indicate that the product is acceptable." It is colored 'green'. In addition, a predetermined range on both sides of this determination information 23a is colored with "yellow indicating that it is a semi-accepted product" as dimensional error determination information 23b, and the remaining range is colored with dimensional error determination information 23c. It is colored "red to clearly indicate that it is a rejected product". The ranges of the determination information 23a and 23b are examples of the permissible range of dimensional error, and the determination information 23c is an example of the non-permissible range of dimensional error.

The determination information 23a to 23c as described above is an example of information displayed on the display surface section 22, and the display color and display content are arbitrary. Further, instead of coloring with such a permanent marker pen or the like, for example, an arc-shaped belt-shaped sticker printed with color information and character information constituting the determination information 23a to 23c is attached to the display surface portion 22. good too. Further, when the dial gauge cover 20 is made of paper, the color information constituting the determination information 23a to 23c may be colored with a water-based marker pen, and other information may be written with a ballpoint pen or the like. Further, color information, character information, and the like may be displayed after the surface of the display surface portion 22 is covered with a coating agent to which ink for coloring or notation is compatible.

By fitting the outer frame ring 16 to the inner circumference of the circular ring portion 21, the dial gauge cover 20 colored in this manner can be externally connected via the convex portion 25 that functions like a wedge on the inner peripheral surface 21c. The frame ring 16 fits into the inner peripheral surface 21c. Thereby, the operator can attach the dial gauge cover 20 to the dial gauge 10 with one touch. As shown in FIGS. 1(A) and 3(B), the dial gauge cover 20 attached to the dial gauge 10 is such that the tip 22a of the display surface portion 22 reaches near the scale 15b around the scale plate 15a. Therefore, the allowable range of dimensional error can be specified in multiple places.

When the dial gauge cover 20 mounted in this manner is removed from the dial gauge 10, for example, an operator puts the index fingers of both hands on the annular portion 21 and removes the transparent cover 15e of the dial gauge 10 with the thumbs. By applying a force so as to pull the annular portion 21 forward while pressing , it becomes possible to release the engagement between the outer frame ring 16 and the annular portion 21, so that the dial gauge cover 20 can be removed from the outer frame ring 16. Can be easily removed.

[Another reference example]
Next, a configuration example (another reference example) of the dial gauge cover 30 capable of increasing the area that can be displayed by the display surface portion 22 will be described with reference to FIGS. 4 and 5. FIG. 4(A) is a front view of the dial gauge cover 30, FIG. 4(B) is a rear view thereof, FIG. 4(C) is a plan view of the same, FIG. 4(D) is a bottom view of the same, and FIG. (E) is a right or left side view of the same, FIG. 4(F) is a sectional view of the dial gauge cover 30 seen from the direction of the arrow 4F shown in FIG. 4(B), and FIG. An enlarged view of a cross-sectional portion of the display surface portion is shown. It should be noted that from these figures, the external shape of the dial gauge cover 30 can be understood as the design of the article "display cover" related to the design. The side view of the dial gauge cover 30 shown in FIG. 4(E) appears the same on the left and right.

As shown in FIG. 4, a dial gauge cover 30 of another reference example differs from the above-described dial gauge cover 20 mainly in that it has an extension portion 31 extending radially outward from the display surface portion 22 . Therefore, in FIGS. 4 and 5, the same reference numerals are given to substantially the same components as those of the dial gauge cover 20, and description thereof will be omitted. The dial gauge cover 30 is composed of an annular portion 21 , a display surface portion 22 and an extension portion 31 . Like the dial gauge cover 20, these are integrally formed of synthetic resin or paper.

The extension part 31 is set so that its outer diameter protrudes more than the outer frame ring 16 of the dial gauge 10 . In another reference example, instead of a shape in which only the base end portion 22b of the display surface portion 22 is expanded into a plate shape, the outer peripheral surface 21d of the annular portion 21 is made large in diameter (thickened) to form the expanded portion 31. forming. Note that the extended portion 31 may be formed by extending the one end portion 21a of the annular portion 21 into a plate shape, as indicated by a two-dot chain line L shown in FIG. 4(F).

When the dial gauge cover 30 is attached to the dial gauge 10 , the extended portion 31 projecting radially outward may contact the stand 50 holding the dial gauge 10 . That is, when the dial gauge cover 30 has the extended portion 31 formed in the direction of the stand 50 when mounted, the outer peripheral surface 31a of the dial gauge cover 30 is likely to come into contact with the clamp 52 of the stand 50 . Therefore, contact between the extended portion 31 and the clamp 52 is avoided by providing a cutout portion 32 excluding the extended portion 31 in a predetermined range facing the stand 50 when mounted (see FIG. 5A). The predetermined range can be defined, for example, as a fan-shaped central angle θ (eg, 60 degrees) that faces directly downward when the dial gauge cover 30 is mounted in a circular frame surrounded by the tip portion 22a.

As shown in FIGS. 4(F) and 4(G), the peripheral wall of the annular portion 21 of the dial gauge cover 30 has a constant thickness. In the dial gauge cover 20 described above, the peripheral wall of the annular portion 21 is set so that the plate thickness decreases from the one end portion 21a to the other end portion 21b, so the diameter increases from the one end portion 21a to the other end portion 21b. Although the inner peripheral surface 21c is slanted so as to allow the inner peripheral surface 21c to be inclined (see FIG. 2(D)), the inner peripheral surface 21c' of the dial gauge cover 30 has a constant inner diameter Dd, and the inner peripheral surface 21c' is also slanted. do not have. On the other hand, the convex portion 35 formed on the inner peripheral surface 21c' is shaped like a wedge.

The protrusion 35 has a width, length, The positions and number of the formed portions are set in the same manner as the convex portions 25 . The convex portion 35 is formed so that one end portion 35a (on the one end portion 21a side) is the highest and the other end portion 35b (on the other end portion 21b side) is the lowest. The maximum height of the convex portion 35 is the same size as the height of the convex portion 25 .

By configuring the convex portion 35 in this way, when the dial gauge cover 30 is attached to the outer frame ring 16, the outer frame ring 16 is wedged enough to fit from the other end portion 21b to the one end portion 21a of the annular portion 21. The outer frame ring 16 can be tightly fitted to the inner peripheral surface 21c' via the convex portion 35 that functions as a ring. As in the dial gauge cover 20 described above, the peripheral wall of the annular portion 21 is configured so that the plate thickness decreases from the one end portion 21a of the annular portion 21 toward the other end portion 21b. Also, the fitting of the outer frame ring 16 and the annular portion 21 can be obtained even if the convex portion 35 is configured so that its height is constant regardless of its position in the longitudinal direction.

The outer frame of the dial gauge 10 has the same degree of inclination or approximately the same degree of inclination as the degree of inclination of the top of the projection 35 due to the height of the projection 35 increasing from the other end 21b toward the one end 21a. When the diameter of the ring 16 is reduced in the direction away from the scale plate 15a (the diameter is expanded in the direction to approach the scale plate 15a), the outer frame ring 16 is fitted into the annular portion 21 at the beginning or in the middle. It is possible to fit with a predetermined degree of fit at the deepest part of the penetration depth or in the vicinity thereof.

Further, the height of the convex portion 35 may be configured to be constant. As described above, instead of forming a wedge shape in which the height of the convex portion 35 increases from the other end portion 21b of the annular portion 21 toward the one end portion 21a, the height of the convex portion 35 is set at its longitudinal position. may be configured to be the same or nearly the same regardless. As a result, for example, when the outer frame ring 16 of the dial gauge 10 has a constant outer diameter without contracting or expanding, the fitting amount by which the outer frame ring 16 is fitted into the annular portion 21 is calculated. It becomes possible to obtain a constant degree of fitting regardless of the

By constructing the dial gauge cover 30 of another reference example in this way, it is possible to display character information and the like on the extended portion 31 in addition to the display surface portion 22. It is possible to display more judgment information such as pass/fail for the scale 15b indicated by the pointer 15d in more colors and characters. Also, for example, as shown in FIG. 31, or a two-dimensional bar code that encodes product information, etc., can be displayed on the extension part 31. FIG.

As described above, in the dial gauge covers 20 and 30 of the reference example and another reference example, the annular portion 21 has an annular shape with an inner diameter Dd slightly larger than that of the outer frame ring 16 of the dial gauge 10. The inner peripheral surfaces 21 c and 21 c ′ have projections 25 and 35 extending linearly in the axial direction at a plurality of positions in the circumferential direction. The display surface portion 22 has a tip portion 22a extending like an eave from one end portion 21a of the annular portion 21 in the inner diameter direction and the circumferential direction, and covers the outer peripheral edge 15f of the transparent cover 15e when mounted on the outer frame ring 16. It reaches the scale 15b or its vicinity. As a result, the tip portion 22a of the display surface portion 22 reaches near the scale 15b around the scale plate 15a, so that the pointer 15d of the dial gauge 10, for example, points to the display surface portion 22 including such tip portion 22a. It is possible to display the judgment information 23a to 23c, such as the quality of the scale 15b, at a plurality of locations using colors, characters, or the like.

Further, when the annular portion 21 is attached to the outer frame ring 16 of the dial gauge 10, the convex portions interposed between the outer periphery of the outer frame ring 16 and the inner peripheral surfaces 21c, 21c' of the annular portion 21 Since 25 and 35 are fitted between them, the annular portion 21 can be fitted to the outer frame ring 16, and the dial gauge cover 20 can be easily attached. In addition, the dial gauge cover 20, which is mounted by fitting the annular portion 21 around the outer frame ring 16 in this way, can be used by a worker, for example, by placing the index fingers of both hands on the annular portion 21 other than the thumbs. The engagement between the outer frame ring 16 and the annular portion 21 can be released by applying a force to pull the annular portion 21 forward while pressing the transparent cover 15e with the thumb. The gauge cover 20 can be easily removed. Therefore, it is possible to clearly indicate the allowable range of dimensional error and the like at a plurality of places, and to facilitate the attachment/detachment work.

Further, since the annular portion 21 has the convex portions 25, 35 which are present linearly in the axial direction at a plurality of locations in the circumferential direction of the inner peripheral surfaces 21c, 21c', the annular portion 21 can be rotated in the circumferential direction. When the dial gauge 10 is rotated, the outer frame ring 16 of the dial gauge 10 can also be rotated accordingly. As a result, the scale plate 15a can be rotated in the circumferential direction together with the outer frame ring 16. Therefore, for example, by rotating the annular portion 21, the pointer 15d of the dial gauge 10 can be moved to an arbitrary rotation position. A zero alignment operation can be performed. In the reference example and other reference examples, the outer circumference of the outer frame ring 16 of the dial gauge 10 has spline grooves on the entire circumference, so that the width, depth and circumferential position (formation pitch) of the spline grooves are suitable. By determining the shape of the projections 25 and 35 and the circumferential position of the annular portion 21, the spline grooves of the outer frame ring 16 and the projections 25 and 35 of the annular portion 21 can mesh well with each other. becomes possible. As a result, the annular portion 21 is prevented from slipping in the circumferential direction with respect to the outer frame ring 16, so that both can be easily rotated together.

Further, in the reference example described above and another reference example, the convex portions 25 and 35 are formed on the inner peripheral surface 21c and 21c' of the annular portion 21 so as to exist linearly in the axial direction at a plurality of locations in the circumferential direction. Although formed on the surfaces 21c and 21c', for example, convex portions may be formed on the inner peripheral surfaces 21c and 21c' so as to exist in the axial direction of the annular portion 21 in the form of broken lines or dotted lines. For example, the projections 25 and 35 may be divided in a plurality of locations in the longitudinal direction, or circular point-like projections in plan view may be arranged in a line in the axial direction of the annular portion 21 like braille blocks. You may arrange|position and comprise.

[Embodiment]
In the dial gauge cover 20 of the reference example described above and the dial gauge cover 30 of another reference example, the display surface portion 22 thereof is colored with a permanent marker pen or the like, or has an arcuate band shape on which color information or character information is printed. It had a flat surface so that it could be used with a sticker attached (see FIGS. 1 to 5). For example, in the examples shown in FIGS. 3(B) and 5(B), in a predetermined range around 0 (zero) on the scale 15b of the dial gauge 10, there is a green color indicating that the product is acceptable. information 23a), a predetermined range on both sides of this judgment information 23a indicates "yellow indicating that the product is semi-acceptable" (judgment information 23b), and the remaining area indicates "red indicating that the product is unacceptable"' (determination information 23c) are colored.

For such coloring, for example, oil-based marker pens, felt-tip pens, etc., which are relatively simple and easy to handle and are inexpensive, are often used at work sites. These pens tend to have a thicker tip than the interval (1 to 2 mm) between the scales 15b of the dial gauge 10 because of the need to quickly color a wide area.

For this reason, when the display surface portion 22 is colored using a marker pen or the like with a thick pen tip, the positional accuracy of the boundary portions colored with different colors tends to deteriorate. That is, with a marker pen or the like with a thick pen tip, as shown in FIGS. It is difficult to accurately color the boundary between the information 23b) and red (determination information 23c) according to the scale of the scale of the measuring instrument.

Marker pens, felt pens, and the like typically use liquid ink for coloring. Ink may flow past and color areas adjacent to the area. Such overflow of ink at the time of coloring can obscure the boundary between different colors, making it difficult to clearly separate the boundary between colors.

Therefore, in one embodiment of the display cover of the present invention, in addition to being able to clearly indicate the allowable range of dimensional error, etc. The cover 40 will be explained.

The configuration of the dial gauge cover 40 according to this embodiment is illustrated in FIGS. 6 and 7. FIG. 6(A) is a front view of the dial gauge cover 40, FIG. 6(B) is a rear view thereof, FIG. 6(C) is a right or left side view of the same, and FIG. 6(D) is a diagram. A cross-sectional view of the dial gauge cover 40 seen from the direction of the arrow 6D shown in 6(B) is shown. 7A and 7B are diagrams showing an example of a state in which the dial gauge cover 40 is attached to the dial gauge 10, as viewed from the front of the dial gauge 10 (FIG. 7A). A view (FIG. 7(B)) including a partial cross section viewed from the direction of arrow 7B is shown. In FIG. 7B, an enlarged view within the dashed-dotted line circle is illustrated within the solid line circle.

Although a plan view and a bottom view of the dial gauge cover 40 are not shown, the annular portion 41 of the dial gauge cover 40 in these figures is the one shown in FIG. 90 degrees counterclockwise in the case and clockwise in the case of the bottom view. Further, the engaging claw 45 of the dial gauge cover 40 rotates 90 degrees counterclockwise (in the case of a plan view) or clockwise (in the bottom view) around the engaging claw 55 of the dial gauge cover 50 shown in FIG. 8(C) described later. ) appears similar to the rotated shape. Therefore, the plan view and the bottom view of dial gauge cover 40 can be grasped as a combined shape.

6(A) to 6(D) and 8(C), the external shape of the dial gauge cover 40 can be grasped as the overall design of the article "display cover" related to the design. 6(A) to 6(D), the external shape of the dial gauge cover 40 excluding the engaging claw 45 including the claw portion 45a can be grasped as a partial design of the article "display cover" related to the design. can. In the shape of the overall design and the partial design, the side views of the dial gauge cover 40 appear the same on the left and right, and the plan view and bottom view also appear the same.

As shown in FIGS. 6 and 7, the dial gauge cover 40 of the present embodiment is composed of an annular portion 41 and an engaging claw 45, and similar to the dial gauge cover 20 of the reference example described above, is made of, for example, polypropylene. , ABS resin, polycarbonate, or other synthetic resin. For example, a synthetic resin that becomes white after being molded is used in order to allow arbitrary colors (green, yellow, red, etc.) to be colored with an oil-based marker pen or the like.

The annular portion 41 is formed in a cylindrical shape with a short axial length, the inner diameter Dd of the inner peripheral surface 41c of which is set to be slightly larger than the outer diameter of the outer frame ring 16 of the dial gauge 10 ( See FIG. 6(D)). The axial length of the annular portion 41 is of a size that can be attached to the outer frame ring 16 of the dial gauge 10, that is, substantially equal to or shorter than the axial length of the outer frame ring 16, and is circular in the attached state. One end portion 41a of the ring portion 41 is set to have a length that is substantially the same as the surface (end face) position of the transparent cover 15e of the display portion 15 (see FIG. 7). As a result, the end surface (display surface) of the one end portion 41a of the annular portion 41 and the end surface of the transparent cover 15e are substantially flush with each other when mounted. 30, even if the dial gauge 10 with the dial gauge cover 40 mounted thereon is viewed from the slightly left side (right side, upper side or lower side) obliquely from the front, the line of sight is less likely to be blocked by the annular portion 41. - 特許庁Therefore, it is possible to prevent a portion of the scale 15b from becoming invisible.

The peripheral wall (cylinder wall) of the annular portion 41 is set to have a constant thickness in the axial direction of the annular portion 41, and the thickness is set to 1.5 mm, for example. As with the dial gauge cover 20 of the reference example described above, the thickness of the peripheral wall is such that the dial gauge 10 with the dial gauge cover 40 attached thereto can be held by the stand 50, or the dial gauge 10 held by the stand 50 can be dialed. This value is set so that the outer peripheral surface 41d of the annular portion 41 does not come into contact with the clamp 52 that clamps the stem 12 when the gauge cover 40 is attached, and is set to a value that allows the clearance SP (stand 50, clamp 52 and gap SP (see FIG. 1).

One end portion 41a, which is one end in the axial direction (thickness direction) of the annular portion 41 and functions as a display surface, has an inner diameter Da set smaller than the inner diameter Dd of the previously described cylindrical shape. That is, as shown in FIG. 6(D), the dial gauge cover 40 has one end portion 41a formed so as to have an L-shaped cross section in the axial direction. 16 is configured to be able to cover the peripheral portion on the front side (see FIG. 7(B)). The surface of the one end portion 41a is colored with a permanent marker pen or the like in the same manner as the display surface portion 22 of the reference example described above, and the determination information (for example, in FIG. 7, the portion colored in dark gray or light gray) etc.).

Although the one end portion 41a functions as a display surface in this way, it does not extend like a canopy in the inner diameter direction of the annular portion 41, unlike the display surface portion 22 of the reference example described above. Therefore, compared to the ring portion 21 of the reference example, the axial length of the ring portion 41 is smaller, that is, the thickness of the ring portion 41 is configured to be thinner. As a result, compared to the dial gauge covers 20 and 30 of the above reference example and another reference example, the dial gauge 10 with the dial gauge cover 40 mounted thereon can be viewed from a slightly left (right, upper or lower) oblique direction from the front. Even when looking at the scale plate 15a, the line of sight is less likely to be blocked by the annular portion 41.例文帳に追加Therefore, it is possible to prevent a portion of the scale 15b from becoming invisible.

In addition, at the one end 41a, it spreads so as to radially diffuse from the center of the annular portion 41 toward the entire circumference of the annular portion 41 (or from the entire circumference of the annular portion 41 toward the center of the annular portion 41). A plurality of linear grooves 42 positioned on a plurality of lines are formed. The filament groove 42 is a linearly continuous recess (striate recess). In this embodiment, the number of scales 15b is adjusted so that all the scales 15b displayed on the scale plate 15a of the dial gauge 10 and the plurality of linear grooves 42 formed in the one end portion 41a are positioned. Each position of a plurality of linear grooves 42 is set on 100 matching lines.

That is, a plurality of linear grooves 42 are arranged in the circumferential direction of the annular portion 41 at the same intervals as the scales 15b so as to be positioned on the lines extending outward from the scale lines 15b of 0 to 99, and at one end portion 41a. formed. In this embodiment, such a plurality of linear grooves 42 are provided so as to extend to the outer peripheral surface 41 d of the annular portion 41 . That is, a plurality of linear grooves 43 are formed on the entire circumference of the outer peripheral surface 41 d and also at positions corresponding to the scales 15 b of the dial gauge 10 . Instead of the linear grooves 42 and 43, for example, linear ridges or linear streaks may be provided on the one end portion 41a or the outer peripheral surface 41d as linearly continuous convex portions (linear convex portions). Moreover, the linear groove 43 may not be formed.

On the other hand, at the other end 41b, which is the other end in the axial direction (thickness direction) of the annular portion 41, two thin-plate-shaped engaging claws 45 protruding in the axial direction of the annular portion 41 extend 180 degrees in the circumferential direction. They are formed so as to be positioned at intervals of degrees and face each other. That is, the annular portion 41 has a pair of hooking claws 45 on its diameter line. These engaging claws 45 are provided with claw portions 45 a so as to face each other toward the inner diameter side of the annular portion 41 . These claws 45a are set at positions and heights that allow them to be hooked on the corners of the outer frame ring 16 when attached, for example. Therefore, when attached to the outer frame ring 16, the annular portion 41 is configured so as not to move or rattle in its axial direction (thickness direction of the outer frame ring 16).

In the present embodiment, these claw portions 45a are formed, for example, in the form of inclined surfaces whose height gradually increases with increasing distance from the other end portion 41b. , is smaller than the inner diameter Dd of the inner peripheral surface 41c (see FIG. 6(D)). Therefore, when attaching the dial gauge cover 40 to the dial gauge 10, the operator uses his/her hand or a tool to expand the engaging claws 45 in the outer diameter direction so that the claw portions 45a are engaged with the outer frame ring 16. However, when removing the dial gauge cover 40, the dial gauge cover 40 is pulled to the opposite side so that the outer frame ring 16 climbs the inclined surfaces of the claw portions 45a so that the two engaging claws 45 are separated. Widen the facing distance. As a result, the operator can easily remove the dial gauge cover 40 from the dial gauge 10 without using any tools.

In contrast to the claw portion 45a of the engaging claw 45, the claw portion may have an inclined surface whose height gradually increases as it approaches the other end portion 41b. In this case, when the dial gauge cover 40 is attached to the dial gauge 10, the outer frame ring 16 climbs the inclined surfaces of the claws to widen the distance between the two engaging claws 45. The dial gauge cover 40 can be easily attached to the dial gauge 10 without using any tools. , it is necessary to release the engagement between the outer frame ring 16 and the claw.

By constructing the dial gauge cover 40 in this way, linear grooves 42 and 43 are formed in the one end portion 41a of the annular portion 41 at positions corresponding to the scales 15b of the dial gauge 10. As shown in FIG. Therefore, for example, when the judgment information such as the quality of the scale 15b indicated by the pointer 15d of the dial gauge 10 is visually indicated by coloring it with a permanent marker pen or a felt pen corresponding to the information in green, yellow, red, etc. (For example, in FIG. 7, the portions colored in dark gray or light gray, etc.), even if the coloring ink of these pens flows out of the nib, the flow of such ink is The ink stays in the range between the linear grooves 42 and 43 that are blocked by the adjacent grooves 42 and 43 . Therefore, it is possible to suppress the ink from running out during coloring.

In addition, instead of the linear grooves 42 and 43 provided in the one end portion 41a and the outer peripheral surface 41d, when linear ridges and linear streaks are formed in the one end portion 41a and the outer peripheral surface 41d, an oil-based marker pen, a felt pen, or the like may be used. In addition to impeding the flow of ink coming out of the pen tip, it is also possible to impede the movement of the pen tip. Therefore, for example, even if the operator accidentally moves the pen tip to an unexpected range, such pen movement can be stopped. Therefore, even in such a case, it is possible to prevent ink from running out during coloring.

[Modified example of this embodiment]
Next, a configuration example (modification example 1) of the dial gauge cover 50 provided with a blind plate 54 on the inner diameter side of the annular portion 51 for covering a part of the scale 15b of the scale plate 15a of the dial gauge 10 will be described with reference to FIGS. 9 for explanation. 8(A) is a front view of the dial gauge cover 50, FIG. 8(B) is a rear view thereof, FIG. 8(C) is a right or left side view of the same, and FIG. 8(D) is a diagram. A cross-sectional view of the dial gauge cover 50 seen from the direction of the arrow 8D shown in 8(B) is shown. 9A and 9B are diagrams showing an example of a state in which the dial gauge cover 50 is attached to the dial gauge 10, which are viewed from the front of the dial gauge 10 (FIG. 9A). A view (FIG. 9(B)) including a partial cross section viewed from the direction of arrow 9B is shown.

As shown in FIGS. 8 and 9, the dial gauge cover 50 of Modified Example 1 has a blindfold plate 54 inside the annular portion 51, and the range where the blindfold plate 54 is formed has a line on the annular portion 51. As shown in FIGS. The main differences from the above-described dial gauge cover 40 are that the grooves 52 and 53 are not formed and that the positions of the pair of engaging claws 55 are different. Therefore, except for these points, the annular portion 51, the linear grooves 52 and 53, and the engaging claw 55 have the same shapes as the annular portion 41, the linear grooves 42 and 43, and the engaging claw 45 of the dial gauge cover 40. and materials, so the description of these is omitted. Although not shown, the inner diameter Da of the ring portion 51, the inner diameter Dd of the inner peripheral surface 51c, and the facing distance De between the claw portions 55a of the engaging claw 55 are similar to the inner diameters Da and Dd of the dial gauge cover 40 and the facing distance De. is set in the same way.

The annular portion 51 has a sector-shaped blind plate 54 on its inner diameter side. The blind plate 54 has a plate thickness of about 1 mm, for example, and is formed continuously with the one end portion 51 a , that is, formed integrally with the annular portion 51 in this modified example 1 . The shape (sectoral shape) of the blind plate 54 is determined based on the range of the scale 15b to be hidden on the scale plate 15a of the dial gauge 10 to which the dial gauge cover 50 is attached. The object hidden by the blind plate 54 is, for example, an unnecessary portion of the scale that exceeds the assumed range of the scale 15b indicated by the pointer 15d of the dial gauge 10 and the numbers attached thereto.

For example, in this modified example 1, out of the scale 15b from 0 to 100, if the range from 30 to 70 is an unnecessary scale, the blind plate 54 is set to an angle θa that can hide the scales in the range of "30 to 70" and the numbers "30", "40", "50", "60" and "70" attached to the scales. It is formed in a fan shape.

The fan shape of the blind plate 54 is notched in an arc near the center. In this Modified Example 1, a circle having a slightly smaller diameter Df than a circle 15g indicating a scale 15b displayed on a scale plate 15a of a dial gauge 10 and a display area for the numeral is cut out in an arc shape. Such a fan shape is formed. Further, in this modified example 1, the linear grooves 52 and 53 are not formed in the one end portion 51a and the outer peripheral surface 51d in the range where such a blind plate 54 is formed. Grooves 52 and 53 may be formed.

In addition, in the dial gauge cover 50, the formation position of the pair of engaging claws 55 provided on the other end portion 51b of the annular portion 51 is 90 in the circumferential direction of the annular portion 51 with respect to the engaging claws 45 of the dial gauge cover 40. degree is moved. As described above, when the dial gauge cover 50 is attached to the dial gauge 10, it is necessary to deform the engaging claws 55 so as to widen them in the outer diameter direction. Since the mechanical strength of the ring portion 51 increases in the range of the ring portion 51, it becomes difficult to deform the engaging claw 55 in the outer diameter direction. Therefore, in the dial gauge cover 50 of Modified Example 1, the engaging claw 55 is formed at a position avoiding the formation range of the blind plate 54 .

By configuring the dial gauge cover 50 in this way, the blind plate 54 formed on the annular portion 51 can cover the portion of the scale exceeding the expected range of the scale 15b indicated by the pointer 15d of the dial gauge 10. become. As a result, the operator does not have to visually care about the part of the scale outside the expected range. Therefore, the operator can pay attention to the indicator 15d pointing to the scale 15b within the assumed range and the scale 15b, thereby improving work efficiency.

In addition, on the surface 54a of the blind plate 54 (the surface that can be visually recognized by the operator when attached to the dial gauge 10), information such as characters, symbols, or graphics, for example, is displayed using the dial gauge cover 50. Information on the object to be measured (e.g., model number and symbol) for which pass/fail judgment is performed, information on the dial gauge cover 50 itself (e.g., cover control number), and information on the dial gauge 10 to which it is mounted (e.g., gauge model number) , management number), etc., can be displayed. In addition, alphanumeric characters representing these numbers, symbols, etc., and two-dimensional bar codes, etc., in which numbers, etc. are coded may be displayed. In addition, since the back surface 54b of the blind plate 54 is hidden behind the display unit 15 when the dial gauge cover 50 is attached to the dial gauge 10, by displaying information that can be visually checked only before attachment, the dial gauge can be displayed. It becomes possible to secure display space for information to be checked when the cover 50 is used.

Next, the dial gauge cover 60 is provided with a display surface portion 64 which is separated from the other end portion 61b and extends in the axial direction and which can display information such as characters, symbols, or graphics, at the other end portion 61b of the annular portion 61. An example (modified example 2) will be described with reference to FIG. 10(A) is a front view of the dial gauge cover 60, FIG. 10(B) is a rear view thereof, FIG. 10(C) is a right or left side view of the same, and FIG. 10(D) is a diagram. A cross-sectional view of the dial gauge cover 60 seen from the direction of the arrow 10D shown in 10(B) is shown.

As shown in FIG. 10, the dial gauge cover 60 of Modified Example 2 is mainly different from the above-described dial gauge cover 40 in that a display surface portion 64 is provided at the other end portion 61b of the annular portion 61. As shown in FIG. Therefore, except for these points, the annular portion 61, the linear grooves 62 and 63, and the engaging claw 65 have the same shapes as the annular portion 41, the linear grooves 42 and 43, and the engaging claw 45 of the dial gauge cover 40. and materials, so the description of these is omitted. Although not shown, the inner diameter Da of the ring portion 61, the inner diameter Dd of the inner peripheral surface 61c, and the facing distance De between the claw portions 65a of the engaging claw 65 are similar to the inner diameters Da and Dd of the dial gauge cover 40 and the facing distance De. is set in the same way.

The annular portion 61 has an arcuate unevenness with a central angle θb as a part of the annular portion 61 and apart from the other end portion 61b at the other end portion 61b located on the opposite side of the one end portion 61a in the axial direction. A display surface portion 64 having a curved surface plate shape and extending in the axial direction is provided. The display surface portion 64 has a plate thickness of, for example, about 1 mm. In Modification Example 2, the display surface portion 64 is formed continuously with the other end portion 61b, that is, formed integrally with the annular portion 61 to have a curved plate shape. It is The display surface portion 64 has a convex surface 64a and a concave rear surface 64b, and these surfaces 64a and 64b function as display surfaces capable of displaying information such as characters, symbols, or graphics.

For example, in Modified Example 2, the dial gauge cover 60 is used to determine the quality of the object to be measured (e.g., model number and symbol), information of the dial gauge cover 60 itself (e.g., cover management number), Information of the dial gauge 10 to which it is attached (for example, gauge model number and control number) is displayed. These displays are, for example, alphanumeric characters representing these numbers and symbols, and two-dimensional barcodes in which numbers and the like are coded.

In addition, the central angle θb of the arc of the curved plate shape forming the display surface portion 64 is, for example, a size that can secure a necessary area as the display surface and a range that does not interfere with the formation position of the engaging claw 65 (for example, 170 degree or less). Further, the axial length W of the curved plate shape forming the display surface portion 64 is set, for example, within a range that does not contact the dial gauge 10 to which the dial gauge cover 60 is attached or the stand 50 that holds the dial gauge 10. .

In addition, when the dial gauge cover 60 is attached to the dial gauge 10, the back surface 64b of the display surface portion 64 is hidden by the outer frame ring 16, the body case 11, and the like. In other words, information that needs to be visually confirmed must be displayed on the surface 64a even after the attachment. Information that is sufficient to be visually confirmed only before mounting is displayed on the rear surface 64b, so that a display space for information to be confirmed when the dial gauge cover 60 is used can be secured.

Further, since such a display surface portion 64 is provided at the other end portion 61b of the annular portion 61, the position where the pair of engaging claws 65 similarly provided at the other end portion 61b is formed is a position where the display surface portion 64 is not formed. Limited to Further, unlike the dial gauge cover 50 of Modified Example 1 described above, linear grooves 62 and 63 are formed in the one end portion 61a and the outer peripheral surface 61d of the annular portion 61 in the range where the display surface portion 64 is formed. .

By configuring the dial gauge cover 60 in this way, the display surface portion 64 formed on the ring portion 61 displays information about the dial gauge cover 60, information about the dial gauge 10 to which the dial gauge cover 60 is attached, and the like. , it becomes possible to display information such as characters, symbols or graphics on the display surface. Therefore, the operator can confirm the information about the dial gauge cover 60 and the dial gauge 10 to which it is attached by viewing such information.

As described above, in the dial gauge covers 40, 50, and 60 of the present embodiment, the annular portions 41, 51, and 61 have an inner diameter Dd slightly larger than that of the outer frame ring 16 of the dial gauge 10. It has an annular shape that can be attached to the outer circumference of the frame ring 16 . One end portions 41 a , 51 a , 61 a as display surfaces are provided on one end side in the axial direction of the annular portions 41 , 51 , 61 located on the side of the transparent cover 15 e attached to the outer frame ring 16 . A plurality of linear grooves 42, 52, 62 or linear ridges or linear streaks are formed (arranged) in the one end portions 41a, 51a, 61a. The annular portions 41, 51, 61 are arranged in the circumferential direction at the same interval as the scale 15b of the dial gauge 10 to which the portions 41, 51, 61 are mounted. The plurality of filamentous grooves 42 and the like may be formed not only on the entire periphery of the display surface of the annular portion 41 and the like but only on a part of the periphery.

As a result, since the linear grooves 42 and the like are present at the positions corresponding to the scales 15b of the dial gauge 10 on the one ends 41a, 51a and 61a, they impede the flow of liquid such as liquid ink for coloring. Therefore, for example, when the judgment information such as the quality of the scale 15b indicated by the pointer 15d of the dial gauge 10 is colored with a marker pen, a felt pen, etc., the coloring ink is caught in the linear groove 42 or the like. Easier to stay in range. Therefore, it is possible to prevent the ink from oozing out at the time of coloring.

Further, the outer frame ring 16 of the dial gauge 10 is attached to the other end portions 41b, 51b, 61b of the annular portions 41, 51, 61 located on the opposite side to the one axial end side of the annular portions 41, 51, 61. A plurality of engaging claws 45, 55, 65 that can be engaged with are provided. As a result, when the annular portions 41, 51, 61 are attached to the outer frame ring 16, the engaging claws 45, 55, 65 can be engaged with the stepped portions at the corners of the outer periphery of the outer frame ring 16. This makes it possible to easily mount the dial gauge covers 40, 50, 60. In addition, the dial gauge covers 40, 50, 60 mounted around the outer frame ring 16 in this way, for example, are designed so that the operator can apply force to the engaging claws 45, 55, 65 in a direction in which they are not engaged by hand or the like. , the engagement between the outer frame ring 16 and the engaging claws 45, 55, 65 can be released, and the dial gauge covers 40, 50, 60 can be easily removed from the outer frame ring 16.

In the above-described embodiment, the linear grooves 42, 52, 62 or linear ridges or Although linear streaks are formed (arranged), the display surface portion 22 of the annular portion 21 constituting the dial gauge cover 20 of the reference example and the extended portion 31 of the annular portion 21 constituting the dial gauge cover 30 of another reference example. In addition, a plurality of filament grooves 42 or filament ridges or filamentary streaks may be formed (arranged) as a plurality of filament recesses or filament projections. As with the above-described dial gauge covers 40, 50, and 60, the plurality of linear grooves 42 and the like obstruct the flow of liquid such as liquid ink for coloring. In the case where the judgment information such as quality of 15b is colored with a marker pen, a felt pen, or the like, the coloring ink tends to remain in the range sandwiched between the linear grooves 42 and the like. Therefore, it is possible to prevent the ink from oozing out at the time of coloring.

In the above-described embodiment, the other end portions 41b, 51b, 61b of the annular portions 41, 51, 61 constituting the dial gauge covers 40, 50, 60 are provided with the engaging claws 45, 55, 65. Instead of these engaging claws 45 and the like, for example, a plurality of convex portions 35 (the height increases from the other end portion 21b toward the one end portion 21a) such as that of the annular portion 21 of the dial gauge cover 30 of another reference example. Wedge-shaped protrusions that become larger may be provided in the circumferential direction of the inner peripheral surfaces 41c, 51c, and 61c of the annular portions 41, 51, and 61, respectively. Further, like the annular portion 21 constituting the dial gauge cover 20 of the reference example, the peripheral walls of the annular portions 41, 51, 61 extend from the one end portions 41a, 51a, 61a toward the other end portions 41b, 51b, 61b. The inner peripheral surfaces 41c, 51c, 51c, and 41c of the annular portions 41, 51, 61 are formed so as to have a small plate thickness, and a plurality of protrusions 25 (protrusions whose height is constant regardless of the position in the longitudinal direction) are formed. It may be configured to be provided in the circumferential direction of 61c. These protrusions are protrusions that are linearly present in the axial direction at a plurality of locations in the circumferential direction of the inner peripheral surface of the annular portion.

Thus, like the dial gauge covers 20 and 30 of the above reference example and another reference example, the annular portions 41 , 51 and 61 are attached to the outer frame ring 16 of the dial gauge 10 . Since the protrusions interposed between the outer circumference of the ring 16 and the inner peripheral surfaces 41c, 51c, 61c of the annular portions 41, 51, 61 are fitted between them, the annular portion 41 is fitted to the outer frame ring 16. The dial gauge covers 40, 50, 60 can be easily attached. Further, the dial gauge covers 40, 50, and 60 mounted by fitting the annular portions 41, 51, and 61 around the outer frame ring 16 in this manner can be used, for example, by the operator's forefingers other than the thumbs of both hands. etc. are applied to the annular portions 41, 51, 61, and while pressing the transparent cover 15e with the thumb, a force is applied to pull the annular portions 41, 51, 61 toward the front, thereby separating the outer frame ring 16 and the annular portion 41. , 51 and 61 can be released, the dial gauge covers 40 , 50 and 60 can be easily removed from the outer frame ring 16 . Therefore, it is possible to clearly indicate the allowable range of dimensional error and the like at a plurality of places, and to facilitate the attachment/detachment work.

In addition, in the above-described reference example, another reference example, and the present embodiment, the spindle type dial gauge 10 was exemplified as a measuring instrument to which the dial gauge covers 20, 30, 40, 50, and 60 are attached. A measuring instrument of the type pointing to the scale provided with a scale plate on which the scale is displayed, a pointer that rotates on the scale plate around a rotation axis to point to the scale, and a front cover that covers these. For example, the dial gauge cover 20, 30, 40, 50, 60 can be attached to a lever-type dial gauge, and the same technical action and effects as described above can be obtained. . Moreover, it can be applied by being attached to a measuring instrument other than a dial gauge.

In addition, in the above-described reference example, another reference example, and the present embodiment, the inner peripheral surfaces 21c, 21c′, 41c, 51c, and 61c of the annular portions 21, 41, 51, and 61 are provided at a plurality of locations in the circumferential direction in the axial direction. The convex portions 25 and 35 are formed on the inner peripheral surfaces 21c, 21c', 41c, 51c, and 61c so as to exist linearly in the direction of the ring portions 21, 41, 51, and 61, for example, in the axial direction of the annular portions 21, 41, 51, and 61. The convex portions may be formed on the inner peripheral surfaces 21c, 21c', 41c, 51c, 61c so as to exist in the form of dotted lines. For example, the projections 25 and 35 may be formed in a shape divided at a plurality of points in the longitudinal direction, or the point-like projections that are circular in plan view may be formed into the circular ring portions 21, 41, 51, and 61 like braille blocks. may be arranged in a row in the axial direction of .

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications or changes of the above-described specific examples. In addition, the technical elements described in this specification or in the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims as filed. Furthermore, the techniques exemplified in this specification or drawings achieve a plurality of purposes at the same time, and achieving one of them has technical utility in itself. Note that the descriptions in parentheses in the [Description of Reference Symbols] column can clearly indicate the correspondence between the terms used in the above-described embodiments and the terms described in the scope of claims and the like.

10 ... dial gauge (measuring instrument)
DESCRIPTION OF SYMBOLS 15... Display part 15a... Scale plate 15b... Scale 15c... Rotating shaft 15d... Pointer 15e... Transparent cover (transparent part, front cover)
15f... Peripheral edge (peripheral edge of transparent cover)
16... Outer frame ring (front cover)
17... Outer frame clamp 40, 50, 60... Dial gauge cover (display cover)
41, 51, 61... Annular portion 41a, 51a, 61a... One end (one end in axial direction, display surface)
41b, 51b, 61b... the other end (the other end in the axial direction)
42, 43, 52, 53, 62, 63... Line grooves (line recesses)
45, 55, 65... Engagement claw 54... Blindfold plate (blindfold part)
64... Display surface portion 64a... Surface (display surface)
64b... Back side (display surface)

Claims (4)

a scale plate on which a scale is displayed; a pointer that rotates on the scale plate around a rotation axis to point to the scale; and a front cover that has a transparent portion that allows visual observation of the pointer and the pointer from the outside, covers the scale plate and the pointer, and is rotatable in the circumferential direction together with the scale plate. display cover,
It has an annular shape which has an inner diameter slightly larger than that of the front cover of the measuring instrument and which can be attached to the outer periphery of the front cover, and which is positioned in the axial direction on the side of the transparent portion when attached to the front cover. It has an annular portion having a display surface on the end face on the one end side,
A display cover, wherein a plurality of linear concave portions or linear convex portions are arranged in the circumferential direction of the annular portion at the same intervals as the scales of the scale plate on the display surface. A plurality of engaging claws that can be engaged with the front cover are provided on the other axial end side of the annular portion located on the opposite side of the annular portion in the axial direction with respect to the one axial end side. The display cover according to claim 1. 3. A blind portion is provided in the inner diameter direction of the annular portion to cover part of the scale of the scale plate when the annular portion is attached to the front cover. display cover described in . A character or a symbol extending in the axial direction away from the other axial end side of the annular portion located on the axially opposite side of the annular portion with respect to the axial direction one end side and extending in the axial direction. 3. The display cover according to claim 1, further comprising a display surface capable of displaying graphic information.

Images