Level

Abstract

The present invention provides a spirit level that allows bundled bubble tube holding members to be smoothly inserted into the housing during assembly, even when the housing is formed smaller than the standard dimensions. [Solution] A spirit level capable of measuring multiple different gradients, comprising a plurality of bubble tube holding members 2, each holding a bubble tube 1 in a predetermined inclined state, and a housing 3 that houses the plurality of bubble tube holding members 2 in a bundle, wherein when the bubble tube holding members 2 are bundled, the bubble tube holding members 2 are configured to move toward and away from adjacent bubble tube holding members 2.

Description

Technical Field

[0001] The present invention relates to a spirit level capable of measuring a plurality of different gradients.

Background Art

[0002] Regarding this type of spirit level, the applicant has hitherto proposed spirit levels (hereinafter referred to as "conventional examples") disclosed in Patent Documents 1 and 2.

[0003] These conventional examples are formed by bundling a plurality of bubble tube holding members that hold bubble tubes at different predetermined inclination angles, and accommodating the bundled bubble tube holding members in a housing provided with a measurement reference surface. By rotating the housing about an axis to select a bubble tube at an appropriate inclination angle (gradient), and bringing the measurement reference surface corresponding to this bubble tube into contact with the surface to be measured, the inclination degree (gradient) of the surface to be measured can be measured.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the conventional example, the housing is an aluminum extrusion molded product, and the housing of this aluminum extrusion molded product is formed into a predetermined shape by stretching the soft state immediately after aluminum extrusion molding, so large dimensional tolerances are allowed (about ±0.2 mm to 0.3 mm).

[0006] Therefore, if the bubble level is formed on the negative side (smaller than the reference dimension), it becomes difficult to insert the bundled, high-precision bubble level holders (the bubble level holders in which the bubble level is placed) into the housing during assembly. If forced in, the bubble level holders will rub against the housing and wear down, which changes the inclination of the bubble level relative to the measurement reference surface of the housing, resulting in inaccurate measurements and rendering the level worthless.

[0007] This invention has been made in view of the current situation, and aims to provide a spirit level in which bundled bubble tube holding members can be smoothly inserted into the housing even when the housing is formed smaller than the standard dimensions, thereby not compromising the commercial value. [Means for solving the problem]

[0008] The gist of the present invention will be explained with reference to the attached drawings.

[0009] A spirit level capable of measuring multiple different gradients, comprising a plurality of bubble tube holding members 2, each holding a bubble tube 1 in a predetermined inclination state, and a housing 3 that houses the plurality of bubble tube holding members 2 in a bundle, wherein when the bubble tube holding members 2 are bundled, the bubble tube holding members 2 are configured to move toward and away from adjacent bubble tube holding members 2. Furthermore, the bubble tube holding member 2 is a case body 2' that houses the bubble tube 1, and the bubble tube 1 is configured to be held in the case body 2' in a predetermined inclined state by contacting a contact portion 4 provided on the case body 2', and on both sides of the case body 2' there are comb-shaped portions 5 in which a plurality of protrusions 6 and recesses 7 are arranged alternately, and the protrusions 6 and recesses 7 of the comb-shaped portion 5 of the adjacent case body 2' are connected to the protrusions 6 of the comb-shaped portion 5 provided on the adjacent case body 2'. Furthermore, by cross-engaging with the recess 7, the case bodies 2' form a bundle that cannot slide in the length direction of the case bodies, and the degree of depth of the cross-engagement of the comb-shaped portions 5 between the case bodies 2' can be varied to adjust the amount of movement of the case bodies 2' toward and away from adjacent case bodies 2'. In addition, a biasing member 8 is provided that biases the bundled case bodies 2' toward a direction that reduces the depth of the cross-engagement of the comb-shaped portions 5 between the case bodies 2'. This relates to a spirit level characterized by the following features.

[0010] Furthermore, claims 1 The spirit level described is characterized in that the contact portions 4 are provided at both longitudinal ends of the case body 2', and the horizontal positions of these two contact portions 4 are different, so that the bubble tube 1 is in an inclined state.

[0011] Furthermore, claims 1The spirit level described is characterized in that each of the comb-shaped parts 5 is configured such that the width dimensions of the protrusions 6 and recesses 7, or the arrangement of the protrusions 6 and recesses 7, are different, and that they intersect and engage with the comb-shaped parts 5 of adjacent case bodies 2' only when they are arranged in a predetermined orientation and position.

[0012] Furthermore, claims 2 The spirit level described is characterized in that each of the comb-shaped parts 5 is configured such that the width dimensions of the protrusions 6 and recesses 7, or the arrangement of the protrusions 6 and recesses 7, are different, and that they intersect and engage with the comb-shaped parts 5 of adjacent case bodies 2' only when they are arranged in a predetermined orientation and position.

[0013] Furthermore, claims Choose one of items 1-4 The spirit level described is characterized in that the biasing member 8 is disposed within a space 9 formed in the gap between the bundled case bodies 2'.

[0014] Furthermore, claims 1~4 The present invention relates to a spirit level as described in any one of the paragraphs, characterized in that the case body 2' is provided with an identifier 10 that identifies the case body 2' in which the bubble tube 1 is held in a predetermined inclined state.

[0015] Furthermore, claims 5 The present invention relates to a spirit level characterized in that the case body 2' is provided with an identifier 10 that identifies the case body 2' in which the bubble tube 1 is held in a predetermined inclined state.

[0016] Furthermore, claims 1~4 The present invention relates to a spirit level as described in any one of the paragraphs, characterized in that three case bodies 2', each holding the bubble tube 1 in a different inclined state, are housed in the housing body 3 in a bundle that can move toward and away from adjacent case bodies 2'.

[0017] Also, in the spirit level according to 5 the claim, it relates to a spirit level characterized in that three of the case bodies 2' holding the bubble tube 1 in different inclined states are accommodated in the housing body 3 in a bundled form that can move closer to and away from an adjacent case body 2'.

[0018] Also, in the spirit level according to 6 the claim, it relates to a spirit level characterized in that three of the case bodies 2' holding the bubble tube 1 in different inclined states are accommodated in the housing body 3 in a bundled form that can move closer to and away from an adjacent case body 2'.

[0019] Also, A spirit level according to claim 7, characterized in that three case bodies 2', each holding the bubble tube 1 in a different inclined state, are housed in the housing 3 in a bundle that can move toward and away from adjacent case bodies 2'. it relates to the one according to

Advantages of the Invention

[0020] Since the present invention is configured as described above, even when the housing body is formed smaller than the reference dimension, the bundled bubble tube holding members can be smoothly inserted into the housing body, resulting in a spirit level whose commercial value is not impaired.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view showing this embodiment. [[ID=3i]] [Figure 2] It is an exploded perspective view showing this embodiment. [Figure 3] It is an explanatory cross-sectional view showing the case body of this embodiment. [Figure 4] It is a cross-sectional view taken along the line A-A of FIG. 3. [Figure 5] It is an explanatory view showing the reduced and enlarged states of the bundled case bodies of this embodiment. [Figure 6] It is an explanatory view showing the comb-like portions of each case body of this embodiment. [Figure 7] It is an explanatory view showing the assembling method of this embodiment. [Figure 8] It is an explanatory view showing the assembling method of this embodiment. [Figure 9]This is an explanatory diagram showing how the bundled case bodies in a reduced state are arranged in the housing in this embodiment. [Figure 10] This is an explanatory diagram showing the state in which the bundled case bodies arranged in the housing in this embodiment are enlarged by a biasing member. [Figure 11] This is a reference side view showing another example of this embodiment. [Modes for carrying out the invention]

[0022] A preferred embodiment of the present invention will be briefly described with reference to the drawings, illustrating the operation of the present invention.

[0023] In this invention, when a plurality of bubble tube holding members 2, each holding a bubble tube 1, are bundled together, the bubble tube holding members 2 are configured to move toward and away from adjacent bubble tube holding members 2. Therefore, even if the housing 3 is formed smaller than the standard dimensions and it is difficult to place the bundled bubble tube holding members 2 into the housing 3, the bubble tube holding members 2 can be brought closer together and their outer diameter reduced, allowing the bubble tube holding members 2 to smoothly enter the housing 3 without contacting the housing 3.

[0024] Therefore, when the bundled bubble tube holding members 2 are placed into the housing 3, it is possible to prevent the bubble tube holding members 2 from rubbing against the housing 3 and becoming worn down, thereby preventing inaccuracies in measurement precision.

[0025] In this invention, the outer diameter of the bundled bubble tube holding member 2 refers to the diameter of the circumscribed circle of the bundled bubble tube holding member 2. [Examples]

[0026] Specific embodiments of the present invention will be described with reference to the drawings.

[0027] This embodiment is a level (slope level) that has a plurality of bubble tube holding members 2, each holding a bubble tube 1 in a different predetermined inclination state, and a housing 3 that houses these plurality of bubble tube holding members 2 in a bundle, and is capable of measuring multiple different gradients.

[0028] Specifically, in this embodiment, when the bubble tube holding members 2 are bundled together, the bubble tube holding members 2 are configured to move toward and away from adjacent bubble tube holding members 2, and the outer diameter of the bundled bubble tube holding members 2, specifically the diameter of the circumscribed circle of the bundled bubble tube holding members 2, is configured to expand and contract.

[0029] In this embodiment, as shown in Figures 1 and 2, three bubble tubes 1 are each held in different inclination states by three bubble tube holder members 2, and the spirit level is configured to measure three different gradients. However, the spirit level of this embodiment is not limited to the above configuration. For example, it may be configured as a spirit level that measures six different gradients by holding six bubble tubes in two different inclination states by three bubble tube holder members 2, as disclosed in Patent Documents 1 and 2, or as a spirit level that measures five different gradients by holding five bubble tubes 1 in different inclination states by five bubble tube holder members 2, as shown in Figure 11.

[0030] The components of this embodiment will be described in detail below.

[0031] Each bubble tube 1 is a known bubble tube in which a liquid and bubbles are sealed in a cylindrical container.

[0032] Furthermore, as shown in Figures 2 and 3, the bubble tube holding member 2 is a case body 2' capable of housing the bubble tube 1, and is provided with an opening 11 for visually inspecting the bubble tube 1 in its housed state, a contact portion 4 for maintaining the bubble tube 1 in a predetermined inclined state, a joint portion 5 for combining the case bodies 2' in a bundle so that they can move toward and away from each other, and a positioning portion 12 for positioning the case body 2' in the longitudinal direction (insertion direction) of the housing 3 when the bundled case bodies 2' are housed in the housing 3.

[0033] Specifically, the contact portions 4 are provided at both ends in the longitudinal direction of the case body 2', and the two contact portions 4 are positioned at different horizontal positions relative to each other.

[0034] More specifically, as shown in Figure 3, the contact portion 4 consists of the bottom surface of the concave portion in the case body 2' in which the bubble tube 1 is housed. In this embodiment, the thickness of the bottom surface (contact portion 4) is made different at both ends in the longitudinal direction, resulting in a bottom surface (contact portion 4) with different horizontal positions. When the bubble tube 1 is housed in the concave portion, as shown in Figure 4, the end of the bubble tube 1 comes into contact with this bottom surface (contact portion 4), resulting in a predetermined inclined state (in this embodiment, there are three types: horizontal, 1 / 50 gradient, and 1 / 100 gradient).

[0035] Furthermore, the joint portion 5 is configured as a comb-like portion 5 in which multiple protrusions 6 and recesses 7 are arranged alternately, and is provided on both sides of the case body 2' (both edges along the longitudinal direction).

[0036] In other words, in this embodiment, the protrusions 6 and recesses 7 of the comb-shaped portion 5 interlock with the protrusions 6 and recesses 7 of the comb-shaped portion 5 provided on adjacent case bodies 2', thereby assembling the case bodies 2' into a bundle that cannot slide. Furthermore, the degree of interlocking of the comb-shaped portions 5 between the case bodies 2' allows for variation in the amount of contact and separation (the distance between the case bodies 2') relative to adjacent case bodies 2', thereby causing the outer diameter of the bundled case bodies 2' to expand and contract.

[0037] Specifically, as shown in Figure 5, when the degree of intersecting engagement of the comb-shaped portions 5 between the case bodies 2' becomes uniformly (including approximately uniform) deeper, the diameter of the circumscribed circle of the bundled case bodies 2' becomes smaller, resulting in a reduced state (the state on the left in the figure). Conversely, when the degree of intersecting engagement of the comb-shaped portions 5 between the case bodies 2' becomes uniformly (including approximately uniform) shallower, the diameter of the circumscribed circle of the bundled case bodies 2' becomes larger, resulting in an expanded state (the state on the right in the figure).

[0038] Furthermore, this embodiment includes a biasing member 8 that biases the degree of intersecting engagement of the comb-shaped portions 5 of the bundled case bodies 2' in a direction that becomes shallower, and this biasing member 8 is configured to maintain the expanded state of the bundled case bodies 2'.

[0039] Specifically, the biasing member 8 is disposed within the space 9 formed in the gap between the bundled case bodies 2', and contacts the intersecting engagement portion of the comb-shaped portion 5, biasing it in a direction that reduces the depth of the intersecting engagement between the comb-shaped portions 5, thereby preventing the bundled case bodies 2' from shrinking in diameter.

[0040] Furthermore, each comb-shaped portion 5 has a different width dimension between its convex portion 6 and concave portion 7, or a different arrangement of the convex portion 6 and concave portion 7. It is configured to intersect and engage with the comb-shaped portion 5 only when it is positioned in a predetermined orientation and location. In other words, if the orientation of the case body 2' is reversed or the position is incorrect, the comb-shaped portions 5 of adjacent case bodies 2' cannot engage with each other. This allows the user to notice that the orientation or arrangement is incorrect and to combine the case bodies 2' in a bundle in the correct combination.

[0041] Specifically, in this embodiment, the three case bodies 2' are designated as case body 2'a, case body 2'b, and case body 2'c, respectively. Furthermore, if the comb-shaped portion 5 on one side of each case body 2' is designated as comb-shaped portion 5a and the comb-shaped portion 5 on the other side is designated as comb-shaped portion 5b, then as shown in Figure 6, the comb-shaped portions 5a and 5b of case body 2'a, the comb-shaped portions 5a and 5b of case body 2'b, and the comb-shaped portions 5a and 5b of case body 2'c are all different in configuration. Moreover, the comb-shaped portion 5a of case body 2'a engages only with the comb-shaped portion 5b of case body 2'c, the comb-shaped portion 5b of case body 2'a engages only with the comb-shaped portion 5a of case body 2'b, and the comb-shaped portion 5b of case body 2'b engages only with the comb-shaped portion 5a of case body 2'c.

[0042] Furthermore, as described above, when arranging and combining case bodies 2' in a predetermined orientation and position, a means is required to determine the orientation of the case bodies 2'. In this embodiment, as shown in the figure, the orientation of the case bodies 2' can be determined by making the positioning parts 12 provided at both ends in the longitudinal direction of the case body 2' different in shape.

[0043] In this embodiment, as described above, the orientation is determined by varying the shape of the positioning part 12. However, instead of changing the shape, it may be configured to use different colors. Alternatively, a separate determination means (direction determination part) may be added to the positioning part 12.

[0044] Furthermore, the case body 2' of this embodiment is provided with an identifier 10 to identify that it is a case body 2' in which the bubble tube 1 is held in a predetermined inclined state.

[0045] Specifically, in this embodiment, an identifier 10 is provided on the case body 2' that holds the bubble tube 1 horizontally. By visually identifying this identifier 10, the horizontal position can be determined. When inserting the bundled case bodies 2' into the housing 3, the case body 2' with the identifier 10 is positioned in a predetermined location in the housing 3, thereby allowing each bubble tube 1 to be positioned according to the gradient displayed on the housing 3.

[0046] In this embodiment, as shown in Figures 2 and 6, one side of the positioning portion 12 is colored, and this colored positioning portion 12 is used as the identifier 10. However, the configuration of the identifier 10 is not limited to this.

[0047] Furthermore, the storage body 3 is made of metal and is formed in a triangular tubular shape that closely matches the shape of the bundled case bodies 2'.

[0048] Specifically, the housing 3 in this embodiment is an aluminum extruded product, and as shown in the figure, a V-groove measuring reference surface 13 is provided on each of the three sides.

[0049] Furthermore, as shown in Figure 2, the housing 3 has a window 14 formed at its top, located above the measurement reference surface 13 when the measurement reference surface 13 is facing downwards, allowing the bubble tube 1 to be viewed. In addition, a gradient indicator 15 is provided near this window 14 to show the gradient of the bubble tube 1 as it is visible through the window 14.

[0050] Furthermore, a magnet 17 is provided inside the closing member 16 that closes the front and rear openings of the housing 3. When the surface to be measured is a magnetic material, the housing 3 (measurement reference surface 13) is attracted (magnetically attached) to the surface to be measured by this magnet 17.

[0051] Furthermore, one of the closing members 16 of the housing 3 is provided with a bubble tube 18 for measuring verticality.

[0052] In other words, this embodiment is configured to measure two types of gradients: horizontal and vertical (1 / 50 gradient and 1 / 100 gradient).

[0053] The method for manufacturing (assembly method) of the spirit level according to this embodiment, which is configured as described above, will now be explained.

[0054] First, as shown in Figure 7(a), the bubble tube 1 is incorporated into each case body 2'.

[0055] Next, as shown in Figure 7(b), the orientation of each case body 2' is aligned based on the positioning unit 12, which also serves as a direction discriminator for the case body 2' into which the bubble tube 1 is incorporated (held), and the shape of the comb-shaped portion 5 is checked to align the positions (combined positions) of the case bodies 2'.

[0056] Next, as shown in Figure 7(c), the comb-shaped portions 5 of the case bodies 2', which are aligned in a predetermined orientation and position, are interlocked and combined into a bundle.

[0057] In this process, the bundled case bodies 2' are combined in such a way that the degree of interlocking engagement between the comb-shaped portions 5 of the case bodies 2' increases, thereby reducing the size of the bundled case bodies 2'.

[0058] Next, as shown in Figure 8(d), first, a closing member 16 is provided at the opening of the extruded aluminum housing 3 on the opposite side from the insertion side, and then the bundled, reduced-size case body 2' is inserted into the housing 3. At this time, the axial orientation of the case body 2' is aligned based on the identifier 10, and it is inserted until the rear positioning part 12 abuts against the closing member 16, thereby positioning the case body 2' in the predetermined location. In this embodiment, since the identifier 10 is provided on the case body 2' that holds the bubble tube 1 horizontally, the case body 2' with the identifier 10 is inserted so that it is housed in the position where the gradient indicator part 15 that indicates horizontality is provided.

[0059] As described above, since the case bodies 2' are bundled together in a reduced state, it is easy to insert the case bodies 2' into the storage body 3, and as shown in Figure 9, they are stored with a gap between the case bodies 2' and the storage body 3.

[0060] Next, as shown in Figure 8(e), the biasing member 8 is inserted and positioned within the space 9 formed by the bundled case bodies 2'.

[0061] As shown in Figure 10, the insertion and placement of this biasing member 8 causes the biasing member 8 to contact the intersecting engagement portions of each comb-shaped portion 5, biasing them in a direction that reduces the depth of the intersecting engagement between the comb-shaped portions 5. This causes the case body 2', which is assembled in a bundle in a reduced state, to become an enlarged state where the depth of the intersecting engagement between the comb-shaped portions 5 is reduced.

[0062] As the bundled case bodies 2' expand, as shown in Figure 10, the case bodies 2' are biased to come into contact with the inner surface of the housing 3, and are properly positioned. The bubble tubes 1 held in the case bodies 2' are each in a predetermined inclination state, thus ensuring measurement accuracy.

[0063] Next, as shown in Figure 8(f), the assembly is completed by providing the closing member 16 to the insertion-side opening of the housing 3.

[0064] The effects and advantages of this embodiment, configured as described above, will be explained below.

[0065] In this embodiment, the protrusions 6 and recesses 7 of the comb-shaped portion 5 provided on the case body 2' interlock and engage with the protrusions 6 and recesses 7 of the comb-shaped portion 5 provided on adjacent case body 2', thereby combining the case bodies 2' into a bundle that cannot slide. Furthermore, the amount of contact and separation movement of the case bodies 2' relative to adjacent case bodies 2' (the distance between the case bodies 2') is varied depending on the depth of the interlocking of the comb-shaped portions 5 between the case bodies 2', and as a result, the outer diameter of the bundled case bodies 2' expands and contracts. Therefore, even if the housing 3 obtained by aluminum extrusion molding is formed smaller than the standard dimensions, making it difficult to insert the bundled case bodies 2' into the housing 3, the depth of the interlocking of the comb-shaped portions 5 can be increased, and the case bodies 2' can be combined into a bundle in a reduced state with a smaller outer diameter, allowing the case bodies 2' to be smoothly inserted and arranged into the housing 3 without contacting the housing 3.

[0066] Therefore, when the bundled case body 2' is placed inside the housing 3, it is possible to prevent the case body 2' from rubbing against and being worn down by the housing 3, thereby preventing inaccuracies in measurement precision.

[0067] Furthermore, by providing several types of biasing members 8 of different sizes, and configuring the system so that the enlarged state of the bundled case body 2' can be made to different sizes depending on the size of the biasing members 8, for example, even if the housing body 3 is formed to be larger than the standard dimensions, the housing body 3 can be biased to contact the housing body 3 and stored in a positioned state.

[0068] In this embodiment, the expansion and contraction of the bundled case bodies 2' is not limited to a uniform change in the depth of the cross-engagement between the comb-shaped portions 5 of each case body 2', but also includes changes in the depth of the cross-engagement between the comb-shaped portions 5 of one case body 2' and the comb-shaped portions 5 of other case bodies 2'.

[0069] Furthermore, in this embodiment, the comb-shaped portion 5 provided on each case body 2' differs in the width dimensions of the convex portion 6 and the concave portion 7, or in the arrangement of the convex portion 6 and the concave portion 7. It is configured so that the comb-shaped portion 5 of an adjacent case body 2' intersects and engages only when it is arranged in a predetermined orientation and position. Therefore, if the orientation of the case body 2' is reversed or the position (arrangement) is incorrect, the comb-shaped portions 5 of adjacent case bodies 2' cannot engage with each other. This allows the user to notice that the orientation or arrangement is incorrect and to combine the case bodies 2' in a bundle in the correct combination.

[0070] Thus, in this embodiment, even if the housing 3 is formed smaller than the standard dimensions, the case body 2' can be smoothly inserted into the housing 3 by changing the outer diameter of the bundled case body 2'. Moreover, after insertion, the bundled case body 2' is expanded by the biasing member 8, resulting in a proper housing state where the case body 2' contacts the inner surface of the housing 3, thus ensuring the measurement accuracy of the bubble tube 1.

[0071] Furthermore, this embodiment includes multiple types of biasing members 8 of different sizes, and by configuring the system so that the enlarged state of the bundled case body 2' can be made to different sizes depending on the size of the biasing members 8, even if the housing 3 is formed to be larger than the standard dimensions, the case body 2' can be properly housed in contact with the inner surface of the housing 3, thereby ensuring the measurement accuracy of the bubble tube 1.

[0072] Furthermore, this embodiment eliminates the possibility of incorrect combinations of case bodies 2', making assembly easier and resolving concerns associated with conventional assembly work, resulting in a highly practical spirit level that does not compromise product value.

[0073] It should be noted that the present invention is not limited to this embodiment, and the specific configuration of each constituent element can be designed as appropriate. [Explanation of Symbols]

[0074] 1. Bubble tube 2. Bubble tube holding member 2' Case 3 containment units 4 Contact part 5. Combo-shaped part 6. Convex part 7 recesses 8. Biasing member 9 Space section 10 Identifiers

Claims

1. A spirit level capable of measuring multiple different gradients, comprising a plurality of bubble tube holding members, each holding a bubble tube in a predetermined inclination state, and a housing that houses the plurality of bubble tube holding members in a bundle, characterized in that, when the bubble tube holding members are bundled together, the bubble tube holding members are configured to move toward and away from adjacent bubble tube holding members.

2. A spirit level according to claim 1, wherein the bubble tube holding member is a case body for housing the bubble tube, and the bubble tube is configured to contact a contact portion provided on the case body and be held in a predetermined inclined state by the case body.

3. A spirit level according to claim 2, characterized in that the contact portions are provided at both longitudinal ends of the case body, and the horizontal positions of these two contact portions are different, so that the bubble tube is in an inclined state.

4. A spirit level according to claim 2, wherein both sides of the case body are provided with comb-shaped portions having a plurality of convex portions and concave portions arranged alternately, and the convex portions and concave portions of the comb-shaped portions interlock and engage with the convex portions and concave portions of the adjacent case body so that the case bodies are bundled together and cannot slide, and the amount of movement of the case bodies toward and away from adjacent case bodies can be varied by the degree of depth of the interlocking of the comb-shaped portions of the case bodies.

5. A spirit level according to claim 3, wherein both sides of the case body are provided with comb-shaped portions having a plurality of convex portions and concave portions arranged alternately, and the convex portions and concave portions of the comb-shaped portions interlock and engage with the convex portions and concave portions of the comb-shaped portions provided on adjacent case bodies, thereby forming a bundle that cannot slide, and the amount of movement of the case bodies toward and away from adjacent case bodies can be varied by the degree of interlocking of the comb-shaped portions of the case bodies.

6. A spirit level according to claim 4, characterized in that each of the comb-shaped parts is configured such that the width dimensions of the protrusions and recesses, or the arrangement of the protrusions and recesses, are different, and is configured to intersect and engage with the comb-shaped parts of adjacent cases only when they are arranged in a predetermined orientation and position.

7. A spirit level according to claim 5, characterized in that each of the comb-shaped parts is configured such that the width dimensions of the protrusions and recesses, or the arrangement of the protrusions and recesses, are different, and is configured to intersect and engage with the comb-shaped parts of adjacent cases only when they are arranged in a predetermined orientation and position.

8. A spirit level according to any one of claims 2 to 7, characterized in that a biasing member is provided that biases in a direction that reduces the degree of intersecting engagement of the comb-shaped portions of the bundled case bodies.

9. A spirit level according to claim 8, characterized in that the biasing member is disposed in a space formed in the gap between the bundled case bodies.

10. A spirit level according to any one of claims 2 to 7, characterized in that the case body is provided with an identifier that identifies the case body in which the bubble tube is held in a predetermined inclined state.

11. A spirit level according to claim 8, characterized in that the case body is provided with an identifier that identifies the case body in which the bubble tube is held in a predetermined inclined state.

12. A spirit level according to claim 9, characterized in that the case body is provided with an identifier that identifies the case body in which the bubble tube is held in a predetermined inclined state.

13. A spirit level according to any one of claims 2 to 7, characterized in that three case bodies, each holding the bubble tube in a different inclined state, are housed in the housing in a bundle that can move toward and away from adjacent case bodies.

14. A spirit level according to claim 8, characterized in that three case bodies, each holding the bubble tube in a different inclined state, are housed in the housing in a bundle that can move toward and away from adjacent case bodies.

15. A spirit level according to claim 9, characterized in that three case bodies, each holding the bubble tube in a different inclined state, are housed in the housing in a bundle that can move toward and away from adjacent case bodies.

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