# US 2026/0266649 A1 · Waterproof structure of combination weighing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0266649 A1 - Document ID: US20260266649A1 - Status: Published application - Kind: A1 - Application number: 19/473,112 - Filed: 2023-04-20 - Published: 2026-09-10 - Earliest claimed: 2023-04-20 - Assignees: Yamato Scale Company, Limited - Applicants: Yamato Scale Co., Ltd. - Inventors: Ryo SUEMICHI; Takayuki NAGAI - Web page: https://patentgrep.com/patent/US20260266649A1 ## CPC - G01G 19/393: using two or more weighing units - G01G 21/28: Frames, Housings - G01G: WEIGHING (sorting by weighing B07C5/16) ## Abstract The combination weighing apparatus disclosed herein includes a center base substrate, unit cases, and cover cases. The unit cases each have a flange on an outer circumferential part of an opening formed therein. This flange is allowed to abut the outer circumferential surface of the center base substrate. The cover cases each have a flange on an outer circumferential part of an opening formed therein. This flange is adapted to cover the flange of the unit case with a void being present therebetween. A packing member is interposed between the flanges of the unit case and of the cover case. The center base substrate has, on its outer circumferential surface, blocking protrusions each protruding into between the packing member and the flange of the cover case in the void. ## Claims ### Claim 1 A waterproof structure for a combination weighing apparatus, the combination weighing apparatus, comprising: a center base substrate having a plurality of openings; a plurality of hoppers; and a plurality of driver units each having a cabinet, the plurality of hoppers each being attachable to a respective one of the plurality of driver units, the cabinets of the plurality of driver units being mountable to the plurality of openings of the center base substrate in a manner that the plurality of openings are closable with the cabinets, the plurality of driver units being allowed to open and close the gates of the plurality of hoppers, the cabinets of the plurality of driver units each comprising a unit case, and a cover case, the unit cases each including a metallic material and having an opening formed correspondingly to a respective one of the openings of the center base substrate, the cover cases each including a metallic material and having an opening, the cover cases serving to cover the unit cases, the cover cases each comprising a flange that covers the flange of the unit case, with a void being present therebetween, from an outer circumferential side of the flange, the flanges of the cover cases being annularly disposed circumferentially along the openings, packing members each being interposed between the flange of the unit case and the flange of the cover case, the center base substrate comprising blocking protrusions on an outer circumferential surface thereof, the blocking protrusions each protruding into between the packing member and the flange of the cover case in the void. ### Claim 2 (depends on 1) The waterproof structure for the combination weighing apparatus according to claim 1, wherein the blocking protrusions are annularly formed circumferentially along the openings on the outer circumferential surface of the center base substrate. ### Claim 3 (depends on 1) The waterproof structure for the combination weighing apparatus according to claim 1, wherein the packing members are each in the form of a case having an opening, and the packing members are each held between the unit case and the cover case. ### Claim 4 (depends on 3) The waterproof structure for the combination weighing apparatus according to claim 3, wherein the packing members each cover an outer circumferential surface of the unit case fitted into the packing member through the opening thereof, and the cover cases each cover an outer circumferential surface of the packing member fitted into the cover case through the opening thereof. ### Claim 5 (depends on 4) The waterproof structure for the combination weighing apparatus according to claim 4, wherein the packing members each have a turn-up flange on an outer circumferential portion of the opening thereof, and the turn-up flanges are each allowed to externally fit to the flange of the unit case. ### Claim 6 (depends on 3) The waterproof structure for the combination weighing apparatus according to claim 3, wherein one of an engaging portion or a coupling portion is provided in an upper part of the opening of the unit case and in an upper part of the opening of the center base substrate, the engaging portion being a portion at which an inclined surface of the unit case and an inclined surface of the center base substrate are engageable with each other, the coupling portion being a portion at which the unit case and the center base substrate are allowed to couple to each other with a fastening member, the other one of the engaging portion or the coupling portion is provided in a lower part of the opening of the unit case and in a lower portion of the opening of the center base substrate, and the inclined surface of the unit case and the inclined surface of the center base substrate are securely engageable with each other using the fastening member at the coupling portion.