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EP-4495545-B1 - ATTACHMENT MECHANISM FOR BUBBLE-TYPE LEVEL IN BALANCE

EP4495545B1EP 4495545 B1EP4495545 B1EP 4495545B1EP-4495545-B1

Inventors

  • ISHIMORI, TOMOYUKI

Dates

Publication Date
20260506
Application Date
20220318

Claims (3)

  1. An attaching mechanism for a bubble level in a balance(1), configured as an attaching mechanism for attaching a bubble level to a balance in a manner that enables horizontal adjustment, comprising: a bubble level having a bubble chamber (18) containing a bubble sealed together with liquid; a fixation base (31) having a convex support portion (33) and provided on a balance; a ring-shaped elastic body supported on the convex support portion; and a rotating member that is displaceable in an axial direction according to a rotation direction and a rotation amount for adjusting a tilt of the bubble level, wherein the bubble level is supported on the fixation base to be tiltable in all directions via the elastic body and attached at a plurality of points such that the tilt of the bubble level is adjustable by the rotating member.
  2. The attaching mechanism for a bubble level in a balance according to Claim 1, wherein a convex surface of the convex support portion is formed to be spherical, and the elastic body is a disc spring (41) and the disc spring is joined at an inner circumferential side of one surface to the spherical surface of the convex support portion, and joined at an outer circumferential side of the other surface to a bottom surface of the bubble level.
  3. The attaching mechanism for a bubble level in a balance according to Claim 1 or 2, wherein the bubble level has a flange portion (16) and the rotating member is a plurality of screws provided at even intervals in a circumferential direction on the flange portion.

Description

Technical Field The present invention relates to an attaching mechanism for attaching a bubble level (hereinafter, simply referred to as "level") to a balance. Background Art A balance as a weighing apparatus detects the product of a mass and a gravity as a force when a gravitational acceleration direction is constant, and detects a mass based on a mass of a reference weight, on the premise that the same gravity as a gravity applied to the reference weight is applied to a to-be-weighed object. Therefore, for performing accurate weighing, it is necessary, when a balance is installed, to make a horizontal adjustment to match the gravitational vector. This horizontal adjustment is performed by, for example, adjusting a height of an appropriate leg piece out of a plurality of leg pieces provided on a case accommodating a mass sensor of the balance by moving up/down the leg piece by rotation of a rotating body linked to the leg piece in a predetermined direction. The operation of rotating the rotating body in the predetermined direction is performed while a deviation from the horizontality indicated by the level provided on the case of the balance is checked. Therefore, the balance cannot be installed horizontally unless the level is attached onto the case horizontally. Conventionally, it is common to fix a level horizontally to a case of a balance directly or indirectly via some kind of member by using an adhesive agent or plaster. And once the level is fixed, the horizontal state cannot be readjusted. Therefore, there has been an inconvenience that readjustment of the horizontal state cannot be responded to when it becomes necessary. As a solution to this inconvenience, an attaching structure for a level in a crane vehicle has been proposed in which a base plate is supported on a convex support member of an attaching member so as to be swingable in all directions, a level is fixed onto the base plate, and the level is fixed together with the base plate to the attaching member by three attaching bolts arranged at even intervals such that a tilt angle of the level is adjustable (Patent Literature 1). In addition, a mechanism for attaching a bubble tube serving as a level to a housing that is fixed to a box-shaped main body and has an open upper surface has been proposed in which two nuts are fixed to a bottom portion of the housing, coil springs are respectively arranged corresponding to these nuts, and a bubble tube with screw holes is pressed onto these coil springs, screws are inserted from the screw holes and their tip ends are screwed into the nuts, and by rotating these screws, the horizontal state of the bubble tube is adjusted (Patent Literature 2). Document EP 3792590 B1 discloses a rotation device for an air bubble level of a measuring device. Citation List Patent Literatures Patent Literature 1: Japanese Published Unexamined Utility Model Application No. S61-178415Patent Literature 2: Japanese Registered Utility Model No. 3049294 Summary of Invention Technical Problem A horizontal adjusting mechanism in Patent Literature 1 has a drawback in which when an impact and vibration are applied to a level due to vibration of a crane vehicle after adjustment, the impact and vibration particularly in the vertical direction directly propagate to the level, and accordingly, a portion of the level is more greatly displaced in the vertical direction than the other portion and the horizontal state of the level changes. This Patent Literature 1 discloses an attaching structure for a level in a crane vehicle, and so when it is applied to a balance that is required to be highly precise, it is difficult to obtain a desired operation effect. Next, the horizontal adjusting mechanism in Patent Literature 2 has a drawback in which although an impact and vibration in the vertical direction applied to the level after adjustment can be absorbed by two coil springs, it is difficult to prepare two coil springs having exactly the same resilience, and therefore, there is a difference in resilience between the coil springs from the beginning, and in addition, the coil springs are made further different in resilience depending on a screw tightening amount at the time of adjustment, and accordingly absorptions of the coil springs with respect to the impact and vibration in the vertical direction vary, and a portion of the level is more greatly displaced in the vertical direction than the other portion, and the horizontal state of the level greatly changes. The present invention was made in order to eliminate the above-described drawbacks, and an object thereof is to provide an attaching mechanism for a level to a balance which enables horizontal readjustment of the level after the level is attached to a balance and once subjected to a horizontal adjustment, and even when an impact and vibration is applied to the balance and/or level after the horizontal adjustment, can absorb the impact and vibration particularly in the vertical dire