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US-12624985-B2 - Balance including double windshield

US12624985B2US 12624985 B2US12624985 B2US 12624985B2US-12624985-B2

Abstract

The balance includes the double windshield including an inner windshield that covers a weighing pan, and an outer windshield that covers the inner windshield, the respective windshields include sliding doors openable and closable on a lateral surface, a pair of engagement members configured to link sliding doors positioned on the same lateral surface side of the respective windshields so as to move in the same direction are provided, a protrusion is provided on one engagement member, and a recess is provided in the other engagement member, the protrusion is configured to enter into and exit from the recess, when the protrusion enters into the recess, the pair of engagement members is brought into an engaged state, and in such an engaged state, the sliding doors are linked together to be capable of opening and closing simultaneously.

Inventors

  • Hisanori Oda

Assignees

  • A&D COMPANY, LIMITED

Dates

Publication Date
20260512
Application Date
20210628

Claims (4)

  1. 1 . A balance including a double windshield, comprising: a double windshield including an inner windshield that covers a weighing pan, and an outer windshield that covers the inner windshield, wherein the inner windshield and the outer windshield each include a sliding door openable and closable on a lateral surface, and a linkage mechanism configured to link sliding doors positioned on the same lateral surface side so as to move in the same direction is provided on the sliding door of the inner windshield and the sliding door of the outer windshield.
  2. 2 . The balance including the double windshield according to claim 1 , wherein the linkage mechanism consists of a pair of engagement members which are engaged with each other to be disengageable from each other, includes a protrusion provided on one of the engagement members, and a recess provided in the other one of the engagement members, and is configured such that the recess and the protrusion are relatively displaced so that the protrusion enters into and exits from the recess.
  3. 3 . The balance including the double windshield according to claim 2 , wherein the engagement member on which the protrusion is provided includes a housing, and the protrusion is provided to be capable of protruding from and retracting into the housing and to be capable of being positioned in two positions of a most protruding position and a most retracting position.
  4. 4 . The balance including the double windshield according to claim 2 , wherein the engagement member in which the recess is provided includes the recess at a tip end, and an engagement lever, which is capable of rising and lying, and on which a return spring is provided at a rear end, and is configured such that, in a state in which the engagement lever is in a lying state, the protrusion enters into the recess, whereas in a state in which the engagement lever is in a rising state against a resilient force of the return string, the protrusion exits from the recess.

Description

TECHNICAL FIELD The present invention relates to a balance, and particularly a balance including a double windshield that is suitable for a high-resolution balance. BACKGROUND ART A windshield is conventionally provided for a balance in order to prevent wind pressure from adversely affecting weighing. The flow of air around a weighing pan, for example, the air from an air conditioner, the breath of a person in weighing, the flow of air generated when a person walks, and the like act as wind pressure on a load-applied part with the weighing pan as the center. In the windshield, an opening is provided for placing a sample to be weighed on the weighing pan, and a sliding door for opening and closing the opening is usually provided. However, also when the sliding door is opened and closed, a flow of air is generated. Although this flow of air attenuates while moving inside the windshield after the sliding door is closed, the flow of air adversely affects weighing when it hits the weighing pan in this moving process, thereby degrading repeatability, in particular. As a measure to prevent this flow of air from reaching the weighing pan, a balance including a double windshield has been conventionally known in which inside a windshield, another windshield that covers the weighing pan is additionally provided. However, in the double windshield, sliding doors are provided respectively for an inner windshield and an outer windshield. Hence, in weighing, opening and closing operations of a sliding door must be performed twice for the inner windshield and the outer windshield, and there is a drawback that the operability is poor. In particular, the sliding door of the inner windshield is very poor in operability, because it is necessary to open and close the sliding door by reaching out by hand from the outside of the outer windshield. In order to eliminate such poor operability, there is a balance configured to open and close at least a part of the periphery excluding a ceiling portion of the inner windshield by vertically sliding by driving of a motor, and a detection means is also provided for detecting opening and closing of sliding doors sliding in lateral directions that are provided on a pair of lateral surfaces of the outer windshield, so as to open and close the inner windshield in an interlocking manner with opening and closing of the sliding door of the outer windshield, based on a detection result of the detection means (Patent Literature 1). CITATION LIST Patent Literature Patent Literature 1: Japanese Published Unexamined Utility Model Application No. H04-113029 SUMMARY OF INVENTION Technical Problem In the balance of Patent Literature 1, upon detection of opening and closing of the sliding door of the outer windshield that is manually opened and closed, the inner windshield is opened and closed by the motor. Hence, a rack and pinion gear for transmitting a driving force of the motor to an opening and closing portion of the inner windshield is provided on a side wall portion of the inner windshield. Accordingly, the balance of Patent Literature 1 has drawbacks that a driving force transmission mechanism including the rack and pinion gear must be provided within the double windshield, the configuration becomes complicated, and the windshield also increases in size. In addition, the balance of Patent Literature 1 has a drawback that when the motor is driven, dust may be generated from a mechanical contact part within the double windshield in the driving force transmission mechanism in accordance with activation of the driving force transmission mechanism. In addition, in the balance of the Patent Literature 1, after detecting that the opening and closing operations of the sliding door of the outer windshield have been completed, the opening and closing operations of the opening and closing portion of the inner windshield are performed by the motor. Therefore, in weighing, it is not necessary to manually open or close the inner windshield, but the opening and closing operations of the inner windshield and the outer windshield must be performed separately, that is, the opening and closing operations must be performed twice. Here, the amount of outside air that flows into the inner windshield through the outer windshield increases in accordance with the length of a period of time for which the opening and closing portions of the respective windshields are open, and an increase in the inflow amount of the outside air leads to adverse effects on the repeatability that is one of indexes of weighing accuracy. In the balance of Patent Literature 1, the opening and closing operations are performed twice, and thus the opening and closing periods by the respective opening and closing portions of the double windshield are the same as those of a double windshield to be opened and closed without interlocking between the respective opening and closing portions. For this reason, in the balance of Patent Literature 1, the re