# US 10,871,392 B2 · Protective cover for weighing instrument with suspended sliding door > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,392 B2 - Document ID: US10871392B2 - Status: Granted - Kind: B2 - Application number: 16/302,161 - Filed: 2016-07-26 - Published: 2019-05-30 - Granted: 2020-12-22 - Earliest claimed: 2016-07-26 - Assignees: A&D Company, Limited - Applicants: A&D Company, Limited - Inventors: Masahiro Kanno; Shunsuke Kasamatsu - Web page: https://patentgrep.com/patent/US10871392B2 ## CPC - G01G 21/286: {with windshields} - E05D 15/0621: {Details, e.g. suspension or supporting guides (E05D15/0604, E05D15/08 - E05D15/14 take precedence)} - G01G 21/28: Frames, Housings - G01G 21/30: Means for preventing contamination by dust - A47K 3/34: Slidable screens (A47K3/36 takes precedence) - E05Y 2999/00: Subject-matter not otherwise provided for in this subclass - E06B 3/922: {with several wings opening horizontally towards the same side of the opening and each closing a separate part of the opening (E06B3/921 and E06B3/928 take precedence)} - G01G: WEIGHING (sorting by weighing B07C5/16) - E05D: HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS (pivotal connections in general F16C11/00) - A47K: SANITARY EQUIPMENT; ACCESSORIES THEREFOR, e.g. TOILET ACCESSORIES - E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) ## Abstract Provided is a protective cover for a weighing instrument in which movement of a sliding door does not degrade over time. A protective cover (2) for a weighing instrument includes sliding doors (2L, 2R) defining a weighing chamber (5), an upper frame (11) formed at an upper edge of the sliding door, a lower frame (12) formed at a lower edge of the sliding door, an upper guide rail (17) disposed on the upper frame, and a lower guide rail (18) disposed under the lower frame, where the upper guide rail suspends the upper frame, and between the upper guide rail and the upper frame, balls (215) are disposed at a plurality of positions in a moving direction of the sliding door. ## Claims ### Claim 1 A protective cover for a weighing instrument comprising: a sliding door defining a weighing chamber; an upper frame formed at an upper edge of the sliding door; a lower frame formed at a lower edge of the sliding door; an upper guide rail disposed on the upper frame; and a lower guide rail disposed under the lower frame, wherein between the upper guide rail and the upper frame, balls are disposed at a plurality of positions in a moving direction of the sliding door, wherein on an upper surface of the upper frame, at each of the plurality of positions, a roller portion is formed for holding the balls that includes: a pair of holding portions that each holds the balls in a rollable manner both on a weighing chamber side and a non-weighing chamber side, a columnar support that separates the holding portions, through-holes formed in a lower surface of the holding portions to expose the balls downward, and presser portions that cover and press down the balls, and wherein the upper guide rail has a pair of horizontal surfaces each of which suspends one of the holding portions, and the upper guide rail suspends the upper frame via the roller portion, and the balls come into line contact with the horizontal surfaces of the upper guide rail and the presser portions in up-down direction and roll on the horizontal surfaces being positioned by the through-holes and the columnar support in a direction orthogonal to the moving direction. ### Claim 2 (depends on 1) The protective cover for a weighing instrument according to claim 1, wherein a lower end portion of the lower frame does not come into contact with a bottom surface of the lower guide rail. ### Claim 3 A protective cover for a weighing instrument comprising: a sliding door defining a weighing chamber; an upper frame formed at an upper edge of the sliding door; a lower frame formed at a lower edge of the sliding door; an upper guide rail disposed on the upper frame; and a lower guide rail disposed under the lower frame, wherein the upper guide rail suspends the upper frame, and between the upper guide rail and the upper frame, balls are disposed at a plurality of positions in a moving direction of the sliding door, wherein a through-hole is formed in a bottom surface of the lower guide rail. ### Claim 4 (depends on 3) The protective cover for a weighing instrument according to claim 3, wherein a wall portion of the lower guide rail positioned on the non-weighing chamber side not being a side of the weighing chamber is formed to become longer downward than a wall portion positioned on the weighing chamber side. ### Claim 5 (depends on 1) The protective cover for a weighing instrument according to claim 1, wherein the sliding door is formed by turnably connecting three plates juxtaposed to each other in a moving direction of the sliding door. ### Claim 6 (depends on 2) The protective cover for a weighing instrument according to claim 2, wherein the sliding door is formed by turnably connecting three plates juxtaposed to each other in a moving direction of the sliding door. ### Claim 7 (depends on 3) The protective cover for a weighing instrument according to claim 3, wherein the sliding door is formed by turnably connecting three plates juxtaposed to each other in a moving direction of the sliding door. ### Claim 8 (depends on 4) The protective cover for a weighing instrument according to claim 4, wherein the sliding door is formed by turnably connecting three plates juxtaposed to each other in a moving direction of the sliding door. ### Claim 9 A protective cover for a weighing instrument comprising: a sliding door defining a weighing chamber; an upper frame formed at an upper edge of the sliding door; a lower frame formed at a lower edge of the sliding door; an upper guide rail disposed on the upper frame; and a lower guide rail disposed under the lower frame, wherein between the upper guide rail and the upper frame, balls are disposed at a plurality of positions in a moving direction of the sliding door, wherein on an upper surface of the upper frame, at each of the plurality of positions, a roller portion is formed for holding the balls that includes: a pair of holding portions that each holds the balls in a rollable manner both on a weighing chamber side and a non-weighing chamber side, a columnar support that separates the holding portions, and wherein through-holes formed in a lower surface of the holding portions expose the balls downward and allow the balls to contact horizontal surfaces of the upper guide rail.