Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
  • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
  • G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
  • G01C9/24—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble
  • G01C9/26—Details

Definitions

• the diameter of the housing bore is sufficiently larger than the outer diameter of the sleeve body, so that such a radial adjustment is possible.
• the adjustment means consist, for example, of at least three adjustment screws, which enclose a sleeve end between them at the same angular distance from one another. By turning the adjusting screws provided with a fine thread there is a radial adjustment of the end of the sleeve body in the direction of the respectively actuated, radially directed adjusting screw, and the sleeve body pivots about its opposite end, so that the angle relative to the reference surface of the housing changes so far leaves until the dragonfly axis is exactly parallel or vertical is directed to this reference surface or measuring surface.
• a similar adjustment possibility can also be provided at the opposite end of the sleeve body if no centering bearing is provided there.
• the adjustment by means of adjusting screws which engage at least three circumferential points on the sleeve body has the disadvantage that the magnitude of the force generated by the adjusting screw is uncontrolled.
• the sleeve deforms and the relationship between elastic and plastic deformation, partly also on the sleeve surface, changes after some time, in particular also due to vibrations, so that the accuracy of the spirit level does not remain constant.
• the present invention has for its object to find a spirit level that can be easily adjusted with high accuracy and has an almost constant accuracy. Furthermore, it should be easy to manufacture and allow an embodiment by means of which adjustability is also provided about the longitudinal axis of a tubular dragonfly.
• FIG. 3 shows a section corresponding to the representation in FIG. 2 of a modified embodiment of the basic arrangement according to FIG. 1,
• FIG. 4 shows a further exemplary embodiment of the mounting of the end of a tubular spirit level, which lies opposite the dragonfly end provided with adjusting means
• FIG. 6 shows a further embodiment of a dragonfly end on which the adjusting means engage
• FIG. 8 shows a dragonfly end with a closure piece designed for contact with the adjusting means
• Fig. ' 9 shows a part of a spirit level with an attached end piece for the engagement of the adjusting means.
• the spirit level 2 according to FIG. 1 has a tubular dragonfly 4 made of glass with a bottom 6 formed in one piece.
• the end 8 of the dragonfly opposite the bottom is closed after filling with, for example, alcohol, such as the closing tip 10 shows.
• This air bubble tends to move to the highest point of a curvature with a large radius cut into the inner wall of the dragonfly. This curvature is so slight that it is not visible in the illustration in FIG. 1.
• this representation does not correspond to a true-to-scale representation of the size of the individual parts, in particular the diameter of the dragonfly is usually much smaller in the illustrated size of the spirit level.
• the dragonfly 10 is enclosed and fixed in a sleeve body 20.
• the dragonfly can be fixed in the sleeve body 20 by casting around the dragonfly ends by means of a rigid mass, not shown, which penetrates into the space between the outer dragonfly wall and the inner wall of the sleeve body up to a sealing ring 22 and then solidifies.
• the sleeve body 20 is in turn held in a receiving bore 24 in the housing 26 of the spirit level 2 and can be aligned with high accuracy relative to the reference surface 30 of the spirit level by an adjusting device 28.
• an elongated opening 32 and 34 is provided at the top both in the sleeve body 20 and in the housing 26.
• One end of the sleeve body 20 lies with its peripheral edge 36 against the spherical end 38 of the housing receiving bore 24 and is thus pivotably supported and centered.
• a conical or curved inner edge 40 in the longitudinal direction of the dragonfly, against which the conical end 42 bears at least one adjusting screw 44 (FIG. 2) or 46, 48 (FIG. 3) and the curved end 50 of a spring rod 51 or 53 .
• the contact point of the spring bar is located exactly opposite the adjusting screw 44 or the adjusting screws 46, 48, so that the radially directed spring force of the spring bar counteracts the adjusting force of the adjusting screw 44 directed radially to the sleeve body 20.
• the set screws 44, 46, 48. are each screwed with a fine thread into a threaded hole of a cylindrical closure body 52, which is inserted in an enlarged part 54 of the housing bore and by a pressure screw 58 engaging in a circumferential notch 56 in it Location is secured.
• the spring bar 51 or 53 is also held in the body 52 and can have different cross-sectional shapes, for example round, rectangular, etc.
• a recess 60 is preferably provided in the inner edge 40 of the sleeve body 20, in which the end 50 of the spring rod bears. In this way it is achieved that a rotation of the end body 52 about its axis is transmitted to the sleeve body 20 and an adjustment of the angular position of the dragonfly about its longitudinal axis is possible.
• the various rotational positions of the end body 52 can be fixed by the pressure screw 58.
• these are provided with a head 62 which is received through a countersunk bore 64 in the closure body 52.
• Scale-like markings can be provided at the edge of the counterbore, and a marking on the screw head enables a specific adjustment use of the adjustment screw to be set precisely.
• the screw end 42 can also be convex or concave in the longitudinal direction, and the same applies to the conical or longitudinally curved inner edge 40 of the sleeve body 20.
• the shape is chosen so that, despite the adjustment, the Adjusting screws in their axial direction the contact point between the screw end 42 and the inner edge 40 of the sleeve body is in the same radial plane as the contact point between the end 50 of the spring bar and the inner edge 40, so that no bending forces act on the sleeve body.
• OMPI ⁇ body mounting pieces 66, 68, 70, 72 and 74 are attached. These embodiments are possible since the glass body of the dragonfly can transmit the adjustment forces occurring at one end to the other end or to the opposite mounting piece.
• a dragonfly body corresponding to the illustration in FIG. 1 is used, which is closed at both ends by the glass wall.
• the dragonfly ends, only one of which is shown in FIG. 9, are held rigidly in a socket part 76 by gluing them in or fastening them with a casting compound.
• the outer end of the mounting piece 74 is provided with a conical réelle ⁇ edge 40 'corresponding to the inner edge 40 of the execution • approximately example of FIG. 1.
• the mounting piece 66, 68, 70, 7 * 2 is used. at the same time as a closure body for one end of a glass tube 78, 80, 82, 84, which together with its two closure bodies forms a spirit level.
• the closure bodies either engage in the glass tube, as in the examples according to FIGS. 4, 5 and 8, or enclose it with a frame edge 86, as in the example according to FIG. 6.
• a reliable seal is provided between the contact surfaces sealing adhesive material 88 is provided.
• 3 provided for contact with the end 42 'of an adjusting screw 44' of the mounting piece 68 according to FIG. 3 is convexly curved and also provided with a recess 92 for the engagement of a spring bar (not shown).
• FIG. 4 and 5 show further exemplary embodiments of the pivotable and centering mounting of one end of the libcllen, wherein a spherical body 94 or 96 interacts with a conical surface 98 or 100.
• the spherical body 94 is provided at the end of a cylindrical bearing body 102 which is secured by a pressure screw 104 at the end of the housing bore 106.
• the partial section according to FIG. 7 shows a further embodiment of the spirit level, in which both a sleeve body 20 and mounting pieces at the ends of a glass tube are avoided by the inner edge 106 for the contact of the end 108 with at least one adjusting screw and a conical end edge 110 are integrally formed at the other end of the level on a glass tube 112 which forms the level.
• the dragonfly liquid is enclosed between two sealing bodies 114, 116 which are inserted into the ends of the glass tube 112 and are tightly connected to its inner wall.
• the end 108 of the adjusting screw is provided with a circumferential surface which is convexly curved in the direction of the screw longitudinal axis, while the inner edge 106 is conical.
• the other end 110 of the glass tube 112 lies against a spherical surface 118 in the bottom of the receiving bore 120 of the housing.
• the dragonfly is made of a transparent material such as glass, plastic and the like due to its production. exists and, as a rule, has a different coefficient of thermal expansion than the housing 26, changes in the adjusted adjustment position would result in the case of temperature fluctuations.
• the closure body 52 is present as a separate part, its material and thus its coefficient of thermal expansion can be selected such that the different thermal expansion between the spirit level and the housing is compensated for.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Toys (AREA)
• Details Of Measuring And Other Instruments (AREA)
• Bolts, Nuts, And Washers (AREA)
• Mutual Connection Of Rods And Tubes (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)
• Medical Preparation Storing Or Oral Administration Devices (AREA)
• Level Indicators Using A Float (AREA)
• Closures For Containers (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4228612

Family Applications (1)

Country Status (10)

Cited By (1)

Families Citing this family (2)

Citations (7)

Family Cites Families (2)

• 1978
  • 1978-03-01 CH CH221878A patent/CH623413A5/de not_active IP Right Cessation
  • 1978-04-21 FR FR7811894A patent/FR2418921B1/fr not_active Expired
• 1979
  • 1979-03-01 DE DE792934878A patent/DE2934878A1/de active Granted
  • 1979-03-01 BR BR7907067A patent/BR7907067A/pt not_active IP Right Cessation
  • 1979-03-01 GB GB7936901A patent/GB2036313B/en not_active Expired
  • 1979-03-01 WO PCT/CH1979/000035 patent/WO1979000672A1/de unknown
  • 1979-03-01 JP JP54500495A patent/JPS6252805B2/ja not_active Expired
  • 1979-03-29 IN IN311/CAL/79A patent/IN150230B/en unknown
  • 1979-10-24 SE SE7908799A patent/SE416160B/sv not_active IP Right Cessation
  • 1979-10-30 SU SU792834359A patent/SU1075996A3/ru active

Patent Citations (7)

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