JP2014095632A - Level - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an epoch-making level in which an end part of the magnet exposed from a magnet exposing hole is always arranged at a desired position.SOLUTION: A punching part 6 for bubble tube deployment for mounting a bubble tube 3 for measurement is formed by press work for punching out a measurement reference surface 1 of a level substrate 2 as a positioning surface, and this punching part 6 for bubble tube deployment is used as a magnet mounting position reference part 7 serving as a reference of the magnetic mounting position, and a member 9 engaged with this magnet mounting position reference part 7 is provided with an engagement part 8 for mounting a magnet, and a magnet part 5 is engaged with the engaging part 8 for mounting the magnet. A height of the magnet mounting position reference part 7 for the measurement reference surface 1 is set in such a manner that the end part of the magnet part 5 exposed from the magnet exposing hole 4 is a desired position for an abutting surface 1.

Description

  The present invention relates to a level with a magnet.

  In a spirit level that measures the level and verticality of an object to be measured based on the position of the bubbles in a measurement bubble tube, a magnet exposure hole that has been provided in the spirit level and a measurement reference surface of the spirit level has been provided. There is a level with a magnet that can be measured by exposing a magnet to the object to be measured and attracting it to the object to be measured by the attraction force (magnetic force) of the exposed magnet.

  The conventional level with a magnet is provided with a magnet exposure hole for exposing the magnet to the measurement reference surface, and the magnet is set to have a protruding amount similar to the thickness of the contact portion (for example, the bottom plate portion) provided with the measurement reference surface. It is formed in a shape provided with a convex portion, and the convex portion of this magnet is inserted into the magnet exposure hole from the inner surface side which is the back side of the measurement reference surface, and this magnet is pressed against the inner surface side and fixed in a pressure contact state, In general, the magnet is arranged in a level so that the end of the magnet projection is substantially flush with the measurement reference plane.

Japanese Patent Laid-Open No. 11-183169 JP-A-11-183170

  However, the thickness of the contact portion having the measurement reference surface varies within the range of variations in processing accuracy, and may be thicker or thinner than the designed thickness.

  When the plate thickness of the abutting portion becomes thicker than the design value, the gap between the magnet end and the object to be measured when the measurement reference surface is in contact with the object to be measured is opened, and the magnet is By moving away, the attractive force is weakened, and the desired attractive force may not be exhibited.

  Further, when the plate thickness of the contact portion becomes thinner than the design value, the end of the magnet convex portion inserted into the magnet exposure hole protrudes from the measurement reference surface, and the measurement reference surface is brought into contact with the object to be measured during measurement. In this case, the convex portion of the magnet comes into contact with the object to be measured, and the measurement reference surface does not contact the object to be measured, so that the measurement accuracy (reliability of the level of the level) is lowered, There is a possibility that the perpendicularity cannot be measured.

  This embodiment has been made in view of the above situation, and even if the plate thickness of the abutting portion having the measurement reference surface of the spirit level base fluctuates, the end portion of the magnet exposed from the magnet exposure hole is measured. It is an object of the present invention to provide an epoch-making level in which the end of a magnet is always disposed at a desired position without moving away from or protruding from a reference plane.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A metal level base 2 having a measurement reference surface 1 to be brought into contact with an object to be measured at the time of measurement, a measurement bubble tube 3 provided on the level reference base 2, and a magnet exposure hole 4 provided on the measurement reference surface 1 The measurement reference surface 1 is attracted and fixed to the object to be measured by the magnet portion 5 exposed from the magnet exposure hole 4 so as to be exposed to the bubbles in the measurement bubble tube 3. In the level which measures the level and verticality of the object to be measured based on the position of the measurement object, the measurement bubble tube 3 is attached by pressing the measurement reference surface 1 of the level base body 2 as a positioning surface. A bubble tube placement punching portion 6 is formed, and this bubble tube placement punching portion 6 is used as a magnet attachment position reference portion 7 serving as a reference for a magnet attachment position, or the leveling base 2 is subjected to the press working. By magnet A magnet mounting position reference portion 7 serving as a reference for the attachment position is formed separately from the punching portion 6 for disposing the bubble tube, and this magnet mounting position reference portion 7 is used as a magnet mounting locking portion 8 for this magnet mounting. A magnet mounting locking portion 8 is provided on a member 9 that locks the magnet portion 5 to the locking portion 8 or fits to the magnet mounting position reference portion 7. As a configuration for locking the magnet portion 5, the height of the magnet attachment position reference portion 7 with respect to the measurement reference surface 1 is set such that the end portion of the magnet portion 5 exposed from the magnet exposure hole 4 is relative to the contact surface 1. Thus, the present invention relates to a spirit level characterized by being set to a desired position.

  The bubble tube placement punching portion 6 itself is used as a magnet attachment position reference portion 7 that serves as a reference for the magnet attachment position, and has a fitting portion 10 that fits into the magnet attachment position reference portion 7. By fitting the portion 10 to the magnet attachment position reference portion 7, the attachment position is positioned and the member 9 to be attached to the level base 2 is provided with the magnet attachment locking portion 8, and this magnet attachment member 2. The spirit level according to claim 1, wherein the magnet portion is locked to the stop portion.

  3. The level according to claim 2, wherein the fitting portion and the magnet mounting locking portion are formed integrally with the member by molding resin molding. is there.

  Further, the magnet portion 5 is formed by adhering the metal plate 5B to the permanent magnet 5A, and the metal plate 5B is provided with an engaging portion 11 that engages with the magnet mounting locking portion 8. By engaging the portion 11 with the magnet attachment locking portion 8, the lower end portion of the metal plate 5 </ b> B is positioned at a desired position with respect to the measurement reference plane 1 and exposed from the magnet exposure hole 4. The level according to any one of claims 1 to 3, wherein the level is configured.

  Since the present invention is configured as described above, when the spirit level base is formed, the thickness of the abutting portion that forms the measurement reference surface of the level spirit base varies with respect to the design standard value so as to be thicker or thinner. Even if formed, the end of the magnet portion provided on the level base is always disposed at a desired position. Therefore, the end of the magnet portion provided on the level base and exposed from the magnet exposure hole of the measurement reference surface The measurement reference surface becomes the object to be measured when the part moves away from the measurement reference surface and the attracting force decreases, or the end of the magnet part protrudes from the measurement reference surface and the end of the magnet part contacts the object to be measured. This results in a high-quality level that does not cause problems such as contact failure and reduced measurement accuracy.

1 is an explanatory perspective view illustrating Example 1. FIG. 1 is an exploded perspective view showing Example 1. FIG. 1 is an explanatory plan sectional view showing Example 1. FIG. FIG. 3 is an explanatory plan view showing a state where one cover member of Example 1 is removed. FIG. 3 is an explanatory side sectional view showing a main part of the first embodiment. FIG. 6 is an explanatory exploded perspective view showing a main part of a second embodiment. FIG. 6 is an explanatory plan sectional view showing a main part of Example 2. FIG. 10 is an explanatory exploded perspective view showing a main part of a third embodiment. FIG. 6 is an explanatory plan sectional view showing the main part of Example 3.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  In the present invention, when forming the bubble tube placement punching portion 6 for placing the measurement bubble tube 3 on the level base body 2 by pressing, the measurement reference surface 1 of the level base body 2 is pressed. Since the pressing process is performed as the positioning surface, the bubble tube disposition punching portion 6 formed on the level base 2 by the pressing process is always formed at a certain distance from the measurement reference surface 1. Become.

  That is, pressing is a processing means with extremely high processing accuracy, and a portion punched by the pressing is always formed at a fixed position with respect to the positioning reference surface.

  Therefore, as in the present invention, this level is determined by positioning the level base 2 with the measurement reference surface 1 finished to be a flat and horizontal surface as the reference surface at the time of measurement as the positioning reference surface at the time of pressing. The height direction position of the device base 2 is always set at a fixed position with respect to the punching portion of the press machine, whereby the bubble tube disposition punching portion 6 formed on the level base 2 is Even when the thickness of the contact portion 12 provided with the measurement reference surface 1 of the level base 2 is made thicker or thinner than the design reference value, it is affected by the variation in the thickness of the contact portion 12. Instead, it is always formed at a desired position at a certain distance from the measurement reference plane 1.

  The bubble tube placement punching portion 6 formed at a desired position always spaced from the measurement reference surface 1 without any change in the distance from the measurement reference surface 1 is disposed at the position where the magnet portion 5 is disposed. Therefore, the magnet portion 5 can always be arranged at a fixed position with respect to the measurement reference plane 1.

  Specifically, for example, the bubble tube placement punching portion 6 that is always formed at a certain distance from the measurement reference plane 1 without being affected by the variation in the thickness of the contact portion 12 is provided at the magnet mounting position. A magnet attachment position reference portion 7 serving as a reference for the magnet attachment position separately from the bubble tube placement punching portion 6 by the press working for punching the measurement reference surface 1 as a positioning surface. A member 9 (for example, a cover member attached to the level base 2) provided with a magnet attachment locking portion 8 for locking the magnet portion 5 to the magnet attachment position reference portion 7 is formed. By stopping, the magnet mounting locking portion 8 provided on the member 9 is always disposed at a position spaced apart from the measurement reference plane 1. The magnet part 5 to be locked to the part 8 is a measurement standard. Always be to be disposed at a position spaced a certain distance with respect to 1.

  Further, for example, a magnet attachment position reference portion 7 that serves as a reference for the magnet attachment position is formed separately from the bubble tube placement punching portion 6 by a punching process in which the measurement reference surface 1 is used as a positioning surface. Even when the reference portion 7 is a magnet mounting locking portion 8 and the magnet portion 5 is locked to the magnet mounting locking portion 8, it is locked to the magnet mounting locking portion 8 as described above. The magnet unit 5 is always arranged at a position spaced apart from the measurement reference plane 1 by a certain distance.

  Accordingly, when the level base body 2 is formed, even if the plate thickness of the contact portion 12 forming the measurement reference surface 1 of the level base body 2 varies with respect to the design reference value, it is formed thicker or thinner. The end of the magnet unit 5 provided on the level base 2 is always at a desired position at a certain distance from the measurement reference plane 1, for example, the end of the magnet unit 5 is flush with the measurement reference plane 1. The end portion of the magnet portion 5 provided on the level base body 2 and exposed from the magnet exposure hole 4 of the measurement reference surface 1 is caused by the variation in the plate thickness of the contact portion as in the prior art. The distance from the measurement reference surface 1 decreases the attractive force, or the measurement reference surface 1 does not contact the object to be measured by protruding from the measurement reference surface 1 and the end of the magnet part 5 contacting the object to be measured. There is no problem that the measurement accuracy is reduced, and the suction of the magnet unit 5 is prevented. Force the revolutionary spirit level with excellent practicability which can be maximized to.

  Further, when the bubble tube disposition punching portion 6 is formed on the level base body 2, the formation of the bubble tube disposition punching portion 6 by press work is often performed in the conventional level. Since it is not a special work, it is an epoch-making level that can be realized very easily.

  A specific embodiment 1 of the present invention will be described with reference to FIGS.

  In this example, a metal level base 2 having a measurement reference surface 1 to be brought into contact with the object to be measured at the time of measurement, a measurement bubble tube 3 provided on the level base 2, and a measurement reference surface 1 are provided. And a magnet portion 5 provided so as to be exposed from the magnet exposure hole 4, and the measurement reference surface 1 is attracted and fixed to the object to be measured by the magnet portion 5 exposed from the magnet exposure hole 4. In a level that measures the level and verticality of an object to be measured based on the position, when the level base 2 is formed, the plate thickness of the contact portion 12 that forms the measurement reference plane 1 of the level 2 However, the end of the magnet portion 5 provided on the level base 2 is always disposed at a desired position even if the end portion of the magnet portion 5 is changed to the design reference value. The attraction force decreases when moving away from the measurement reference plane 1, or the end of the magnet unit 5 is The configuration is such that the measurement reference surface does not come into contact with the object to be measured and the measurement accuracy is lowered by projecting from the surface 1 so that the end of the magnet part 5 contacts the object to be measured. Is.

  Specifically, a punching section 6 for mounting the bubble tube for attaching the measuring bubble tube 3 is formed by press punching using the measurement reference surface 1 of the level base 2 as a positioning surface. The punching portion 6 itself is used as a magnet attachment position reference portion 7 that serves as a reference for the magnet attachment position, and a magnet attachment engagement portion 8 is provided on the member 9 fitted to the magnet attachment position reference portion 7, As a configuration in which the magnet portion 5 is locked to the stop portion 8, the height of the magnet attachment position reference portion 7 with respect to the measurement reference surface 1 is the end of the magnet portion 5 exposed from the magnet exposure hole 4 with respect to the contact surface 1. Thus, the configuration is set so that the desired position is obtained.

  More specifically, the level base 2 is formed of a metal material (for example, aluminum) in a horizontal rectangular shape having a cross-section I shape, and the horizontal plate portions on the upper surface side and the bottom surface side are measured at the time of measurement. The measurement bubble 1 is formed on the vertical plate portion 13 arranged in a suspended state between the contact portions 12 on the upper surface side and the bottom surface side. 3 is provided with a bubble tube disposing punching portion 6 for disposing 3 and a magnet disposing punching portion 14 for disposing the magnet portion 5.

  Each contact portion 12 is provided with a concave groove 15 (V groove) having a V-shaped cross section along the longitudinal direction of the contact portion 12, and the measurement reference surface 1 has a convex curved outer peripheral surface. A part of the outer peripheral surface of the object to be measured is fitted into the concave groove 15 when it is brought into contact with the outer peripheral surface of the object to be measured (for example, a pipe member). The two groove edges are brought into contact with the object to be measured so that the measurement can be performed stably.

  Further, in this embodiment, one side of the measurement reference surface 1 of the contact portion 12 provided on each of the upper surface side and the bottom surface side of the level base 2 (in this embodiment, the bottom surface side is the attraction force of the magnet unit 5). The suction surface is fixed to the object to be measured by suction, and the other side (the upper surface side in this embodiment) is a non-attraction surface that does not reach the attracting force of the magnet unit 5. A magnet exposure hole 4 for exposing the magnet portion 5 is formed on the measurement reference surface 1 of the contact portion 12, and the measurement reference on the bottom side is determined by the attractive force (magnetic force) of the magnet portion 5 exposed from the magnet exposure hole 4. The surface 1 is configured to be attracted to the object to be measured, and the magnet exposure hole 4 includes two through holes formed in an elongated shape, and the measurement reference plane is formed at the center in the longitudinal direction of the measurement reference plane 1. 1 is arranged in a state of being opposed to each other along the groove edge portion of the concave groove 15 provided in FIG.

  The bubble tube disposing punching portion 6 and the magnet disposing punching portion 14 formed on the vertical plate portion 13 are punching holes formed by punching, and specifically, the magnet exposure hole 4 is provided. The measurement reference surface 1 (measurement reference surface 1 that becomes an attracting surface by the magnet portion 5) of the abutting portion 12 on the bottom surface side is formed by pressing so as to be punched as a positioning surface.

  The bubble tube placement punching portion 6 is formed by press working with the measurement reference surface 1 of the abutting portion 12 on the bottom surface side provided with the magnet exposure hole 4 as a positioning surface. The part 6 is always formed at a position spaced apart from the measurement reference plane 1 by a certain distance.

  That is, the bubble tube placement punching portion 6 of the present embodiment is configured such that the position in the height direction with respect to the measurement reference plane 1 does not change and is always formed at the same height position.

  More specifically, the punching portion 6 for disposing the bubble tube of the present embodiment will be described in a substantially rectangular shape in which convex portions that can be engaged with the end portions of the measuring bubble tube 3 are formed at both ends in the longitudinal direction. In this embodiment, the horizontal bubble tube placement punching portion 6 for arranging the horizontality measurement bubble tube 3 and the vertical bubble tube placement punching portion 6 for arranging the verticality measurement bubble tube 3 are provided. Three bubble tube placement punching portions 6 are formed together with the 45 ° bubble tube placement punching portion 6 in which the 45 ° measurement bubble tube 3 is disposed.

  In this embodiment, the bubble tube placement punching portion 6 is used as a magnet attachment position reference portion 7 as a reference for the magnet attachment position, and a pair of cover members 9 described later is positioned by the magnet attachment position reference portion 7. It is configured to be attached to the level base 2.

  The pair of cover members 9 to be attached to the level base 2 are arranged so that only the measurement reference planes 1 on the top side and the bottom side of the level base 2 are exposed, and the level base 2 is sandwiched from both the left and right sides. It is configured to be attached to.

  Specifically, the pair of cover members 9 are formed in a rectangular shape in plan view, and the measurement bubble tubes 3 disposed in the bubble tube disposition punching portion 6 of the level base 2 are visually recognized from the outside. A plurality of bubble tube exposure openings 16 are provided to make it possible. Specifically, the horizontal bubble tube exposure openings 16 formed in a horizontal rectangular shape for the horizontality measurement bubble tube 3 are perpendicular to each other. A vertical bubble tube opening 16 formed in a vertical rectangular shape for the angle measuring bubble tube 3 and a 45 degree bubble tube exposing opening 16 formed in an inclined square shape for the 45 degree measuring bubble tube 3. Two bubble tube exposure openings 16 are provided.

  Further, each cover member 9 has a magnet for engaging the magnet portion 5 with the fitting portion 10 fitted to the punching portion 6 for installing the bubble tube, which becomes the magnet attachment position reference portion 7 of the level base 2 on the inner surface. The mounting locking portion 8 is provided.

  Specifically, three fitting portions 10 are provided and fitted with the bubble tube placement punching portions 6 serving as the respective magnet mounting position reference portions 7 provided at the three positions of the vertical plate portion 13 of the spirit level base 2. More specifically, it is formed so as to be substantially the same shape as the bubble tube placement punching portion 6 and can be fitted into the bubble tube placement punching portion 6. It is configured to project inward along the opening edge of the tube exposure opening 16 and to form a peripheral wall.

  Further, in this embodiment, the measurement bubble tube 3 is attached to the fitting portion 10, and specifically, the measurement tube is attached to the fitting portion 10 formed in a peripheral wall shape. A recess 17 is formed, and the measurement bubble tube 3 is fitted and locked to the bubble tube mounting recess 17.

  The magnet mounting locking portion 8 that locks the magnet portion 5 is formed in a protruding shape and protruded from the inner side surface of the cover member 9. The engaging part 11 provided in the magnet part 5 is engaged with the stop part 8 so that the magnet part 5 is positioned and locked.

  Specifically, the magnet unit 5 has a configuration in which metal plates 5B (specifically, yokes used for increasing the attractive force) are provided on both sides of the permanent magnet 5A, and a protruding magnet is attached to the metal plate 5B. By providing a fitting hole 11 as an engaging portion 11 that can be fitted with the locking portion 8 and fitting the fitting hole 11 with the protruding magnet mounting locking portion 8, The lower end is a desired position with respect to the measurement reference plane 1 (for example, the position where the lower end of the metal plate 5B as the yoke constituting the magnet unit 5 is flush with the measurement reference plane 1, for example, the lower end is measured. It is configured to be positioned at a position where a predetermined amount has been immersed from the reference surface 1, specifically, a position where the suction force is so deep as to exert a desired suction force or more. The end of the used metal plate 5B is flush with the measurement reference plane 1 as the end of the magnet unit 5. In is configured to be exposed from the magnet insertion holes 4 provided in the measurement reference surface 1.

  More specifically, the metal plate 5B of the present embodiment is chamfered according to the inclination of the concave groove 15 so that the end portion does not protrude into the concave groove 15 formed on the measurement reference surface 1, and is used as the magnet portion 5. The end of the metal plate 5B is configured to be flush with the measurement reference surface 1 and the groove 15.

  As described above, in this embodiment, the bubble tube placement punching portion 6 is formed by using the measurement reference surface 1 serving as an attracting surface by the magnet portion 5 as a positioning surface at the time of press working, and this bubble tube placement punching portion 6. Is used as a reference for the magnet attachment position, so that the position of the magnet attachment position reference part 7 in the height direction with respect to the measurement reference surface 1 (distance from the measurement reference surface 1) is always constant. By fitting the fitting portion 10 of the cover member 9 to the magnet mounting position reference portion 7 whose position in the height direction relative to the measurement reference surface 1 (distance from the measurement reference surface 1) is always constant, the cover member 9 The mounting position in the height direction is always mounted at a fixed position with respect to the measurement reference plane 1, and the position of the cover member 9 in the height direction with respect to the measurement reference plane 1 is always fixed. Therefore, the magnet attached to this cover member 9 The position of the locking portion 8 in the height direction with respect to the measurement reference plane 1 is always constant, and the magnet portion 5 is attached to the magnet mounting locking portion 8 whose position in the height direction is constant with respect to the measurement reference plane 1. By engaging, the arrangement position in the height direction of the magnet portion 5 (specifically, the end portion of the magnet portion 5) is always constant with respect to the measurement reference plane 1, and the level base Even when the thickness of the abutting portion 12 that forms the measurement reference surface 1 of the spirit level base body 2 is varied with respect to the design reference value when the level 2 is formed, The end of the magnet unit 5 is always arranged flush with the measurement reference plane 1 without being affected by fluctuations.

  A second embodiment of the present invention will be described with reference to FIGS.

  In the first embodiment, the bubble tube placement punched portion 6 is formed by press working using the measurement reference surface 1 as a positioning surface, and the bubble tube placement punched portion 6 is used as a magnet attachment position reference. However, in this embodiment, the magnet mounting position reference portion which is a reference for the magnet mounting position different from the punching portion 6 for disposing the bubble tube by press working with the measurement reference surface 1 as the positioning surface. 7 and the member 9 provided with the magnet mounting locking portion 8 is locked to the magnet mounting position reference portion 7 so that the magnet portion 5 locked to the magnet mounting locking portion 8 is brought to a desired position. The member 9 that is configured to be positioned and locked and that is provided with the magnet mounting locking portion 8 is not the cover member 9 but another magnet portion locking member 9, and the magnet portion 5 is connected to the level base 2 side. It is a case where it is set as the structure provided in.

  Specifically, the level base body 2 is provided with a bubble tube in which the measurement bubble tube 3 is disposed on the vertical plate portion 13 by a punching process in which the measurement reference surface 1 serving as an attracting surface is punched by the magnet unit 5. A magnet attachment position reference portion 7 serving as a reference for the magnet attachment position is formed in a portion different from the punching portion 6 for use and the punching portion 6 for disposing the bubble tube, and the magnet portion 5 is attached to the magnet attachment position reference portion 7. The magnet portion locking member 9 to be locked is positioned and locked.

  More specifically, the magnet attachment position reference portion 7 is formed in a fitting hole into which a later-described magnet portion locking member 9 can be fitted, and in this embodiment, the magnet placement punching portion 14 is formed. The configuration is provided on both the left and right sides.

  The magnet unit 5 has the same configuration as that of the first embodiment, and is provided with metal plates 5B (specifically, yokes used for increasing the attractive force) on both sides of the permanent magnet 5A. In this configuration, a fitting hole 11 as an engaging portion 11 is provided.

  Further, the magnet portion locking member 9 is formed in a horizontal rectangular shape (band shape), and is provided with a fitting convex portion 9A fitted to the magnet attachment position reference portion 7 formed as a fitting hole in the left and right ends. The magnet mounting locking portion 8 that locks the magnet portion 5 is provided between the fitting convex portions 9A, and the magnet mounting locking portion 8 is fitted to the metal plate 5B of the magnet portion 5. The protrusion is configured to be fitted into the joint hole 11.

  In this way, in this embodiment, the magnet attachment position reference portion 7 is formed by using the measurement reference surface 1 serving as an attracting surface by the magnet portion 5 as a positioning surface at the time of press working. The position in the height direction relative to the surface 1 (distance from the measurement reference surface 1) is always constant, and the position in the height direction relative to the measurement reference surface 1 (distance from the measurement reference surface 1) is always constant. By positioning and locking the magnet portion locking member 9 to the reference portion 7, the mounting position of the magnet portion locking member 9 is always locked at a fixed position with respect to the measurement reference plane 1. Since the position of the magnet portion locking member 9 in the height direction with respect to the measurement reference plane 1 is always constant, the magnet mounting locking portion 8 provided on the magnet portion locking member 9 is also measured. The position in the height direction with respect to the reference plane 1 is always constant. The height direction of the magnet portion 5 (specifically, the end portion of the magnet portion 5) is obtained by locking the magnet portion 5 to the magnet mounting locking portion 8 whose height in the height direction is constant with respect to the surface 1. When the level base 2 is formed, the contact position for forming the measurement reference plane 1 of the level base 2 is formed. Even if the plate thickness of the portion 12 fluctuates with respect to the design reference value and is formed thicker or thinner, the end of the magnet portion 5 is always flush with the measurement reference plane 1 without being affected by the fluctuation of the plate thickness. It is configured to be arranged in a state.

  The rest of the configuration is the same as in the first embodiment.

  A specific third embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, the magnet attachment position reference portion 7 serving as a reference for the magnet attachment position is formed by punching the bubble tube placement punching portion 6 in the first embodiment by punching using the measurement reference surface 1 of the level base body 2 as a positioning surface. The magnet mounting position reference portion 7 is used as the magnet mounting locking portion 8 and the magnet portion 5 is locked to the magnet mounting locking portion 8.

  Specifically, the level base body 2 is provided with a bubble tube in which the measurement bubble tube 3 is disposed on the vertical plate portion 13 by a punching process in which the measurement reference surface 1 serving as an attracting surface is punched by the magnet unit 5. A magnet attachment position reference portion 7 serving as a reference for the magnet attachment position is formed in a portion different from the punching portion 6 for use and the punching portion 6 for disposing the bubble tube, and this magnet attachment position reference portion 7 is used as a magnet attachment member. The stop portion 8 is configured.

  More specifically, the magnet mounting locking portion 8 which is also the magnet mounting position reference portion 7 has a configuration formed in a fitting hole into which a locking portion 5C of the magnet portion 5 described later can be fitted. In the example, it is configured to be provided on both the left and right sides of the magnet placement punching portion 14.

  The magnet unit 5 is provided with metal plates 5B (specifically, yokes used for increasing the attractive force) on both sides of the permanent magnet 5A, and magnet mounting locking portions on the left and right sides of the metal plate 5B. As a configuration in which a protruding locking portion 5C that can be fitted and locked to 8 is provided, the locking portion 5C provided on the magnet portion 5 (metal plate 5B) is a magnet mounting position reference portion 7. It is configured to be fitted and locked to the stop portion 8.

  As described above, in this embodiment, the magnet attachment position reference portion 7 is formed by using the measurement reference surface 1 serving as an attracting surface by the magnet portion 5 as a positioning surface during press working, and this magnet attachment position reference portion 7 is used for magnet attachment. Since the locking portion 8 is used, the height of the magnet mounting locking portion 8 relative to the measurement reference plane 1 (the distance from the measurement reference plane 1) is always constant. By engaging and locking the locking portion 5C provided on the magnet portion 5 to the magnet mounting locking portion 8 whose position in the vertical direction (distance from the measurement reference plane 1) is always constant, the magnet portion 5 (specifically When the level base body 2 is formed in such a manner that the arrangement position in the height direction of the end portion of the magnet portion 5 is always constant with respect to the measurement reference plane 1, the level base body 2 is formed. The thickness of the abutment 12 that forms the measurement reference surface 1 fluctuates with respect to the design reference value to make it thicker or thinner. It is made to constitute so that the ends always magnet portion 5 without being influenced by fluctuations in the plate thickness is disposed in the measurement reference surface 1 and the flush condition.

  The rest of the configuration is the same as in the first embodiment.

  In addition, this invention is not restricted to Examples 1-3, The concrete structure of each component can be designed suitably.

1 Measurement Reference Surface 2 Level Level Base 3 Measurement Bubble Tube 4 Magnet Exposed Hole 5 Magnet Portion 5A Permanent Magnet 5B Metal Plate 6 Bubble Tube Displacement Portion 7 Magnet Mounting Position Reference Portion 8 Magnet Mounting Locking Portion 9 Member
10 Mating part
11 Engagement part

The present invention has been made in view of the above-described situation, and even if the plate thickness of the abutting portion having the measurement reference surface of the spirit level base fluctuates, the end of the magnet exposed from the magnet exposure hole is the measurement reference. It is an object of the present invention to provide an epoch-making spirit level in which the end portion of a magnet is always disposed at a desired position without moving away from or protruding from the surface.

Specifically, a punching section 6 for mounting the bubble tube for attaching the measuring bubble tube 3 is formed by press punching using the measurement reference surface 1 of the level base 2 as a positioning surface. The punching portion 6 itself is used as a magnet attachment position reference portion 7 that serves as a reference for the magnet attachment position, and a magnet attachment engagement portion 8 is provided on the member 9 fitted to the magnet attachment position reference portion 7, As a configuration for locking the magnet portion 5 to the stop portion 8, the height of the magnet attachment position reference portion 7 with respect to the measurement reference surface 1 is the end of the magnet portion 5 exposed from the magnet exposure hole 4 with respect to the measurement reference surface 1. Thus, the configuration is set so that the desired position is obtained.

Claims (4)

  Provided so as to be exposed from a metal level base having a measurement reference surface to be brought into contact with an object to be measured at the time of measurement, a measurement bubble tube provided on the level reference base, and a magnet exposure hole provided in the measurement reference surface The measurement reference plane is attracted and fixed to the object to be measured by the magnet part exposed from the magnet exposure hole, and the object to be measured is horizontally aligned based on the position of the bubbles in the measurement bubble tube. In a level for measuring the degree or verticality, a punching portion for mounting the bubble tube for attaching the bubble tube for measurement is formed by pressing the measurement reference surface of the spirit level substrate as a positioning surface. The punched portion for disposing the bubble tube is used as a magnet attachment position reference portion that becomes a reference for the magnet attachment position, or a magnet attachment position that becomes a reference for the magnet attachment position by the press working on the level base. A quasi part is formed separately from the punching part for disposing the bubble tube, and the magnet mounting position reference part is used as a magnet mounting locking part, and the magnet part is locked to the magnet mounting locking part, or The measurement reference plane of the magnet mounting position reference part is configured such that a magnet mounting locking part is provided on a member fitted to the magnet mounting position reference part, and the magnet part is locked to the magnet mounting locking part. The level is set such that the end of the magnet portion exposed from the magnet exposure hole is at a desired position with respect to the contact surface.   The bubble tube placement punched portion itself is used as a magnet attachment position reference portion serving as a reference for the magnet attachment position, and has a fitting portion that fits into the magnet attachment position reference portion. A configuration in which the magnet mounting locking portion is provided on the member to be mounted on the level base body by positioning the mounting position by fitting with the reference portion, and the magnet portion is locked to the magnet mounting locking portion. The level according to claim 1, wherein:   The level according to claim 2, wherein the fitting portion and the magnet mounting locking portion are formed integrally with the member by molding resin molding.   The magnet portion is formed by adhering a metal plate to a permanent magnet, and an engaging portion is provided on the metal plate to engage with the magnet mounting locking portion. The lower end part of the said metal plate is positioned in a desired position with respect to the said measurement reference plane, and it comprised so that it might expose from the said magnet exposure hole by engaging with a part. The level according to any one of the above items.

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