{"id":6841,"date":"2026-10-26T10:53:05","date_gmt":"2026-10-26T02:53:05","guid":{"rendered":"https:\/\/blshardware.com\/?post_type=product&#038;p=6841"},"modified":"2026-10-26T10:56:40","modified_gmt":"2026-10-26T02:56:40","slug":"spring-lift-up-sofa-bed-hinges","status":"publish","type":"product","link":"https:\/\/blshardware.com\/ru\/product\/spring-lift-up-sofa-bed-hinges\/","title":{"rendered":"Heavy-Duty Triangular Spring Lift Up Sofa Bed Hinges|BLS hardware"},"content":{"rendered":"<p>The <strong>spring lift up sofa bed hinges<\/strong> engineered by BLS Hardware serve as the structural backbone for space-saving upholstered furniture, transforming standard sectional seats into accessible under-cushion storage compartments and pull-out sleepers. Manufactured at our dedicated stamping facility\u2014Zhaoqing Gaoyao Jinli Zhengkai Hardware Factory\u2014this heavy-duty triangular mechanism coordinates seamlessly with modern <a href=\"https:\/\/blshardware.com\/product-category\/sofa-bed-hardware\/\">sofa bed hardware<\/a>, precision <a href=\"https:\/\/blshardware.com\/product-category\/sofa-hinges\/\">sofa hinges<\/a>, and structural <a href=\"https:\/\/blshardware.com\/product-category\/sectional-sofa-connector-plates\/\">sectional sofa connector plates<\/a>. When paired with high-clearance <a href=\"https:\/\/blshardware.com\/product-category\/metal-legs\/\">metal legs<\/a>, it provides furniture brands and OEM factories worldwide with a complete, certified mechanical foundation verified through rigorous testing outlined in our <a href=\"https:\/\/blshardware.com\/sofa-hardware-durability-testing-guide\/\">sofa hardware durability testing guide<\/a>.<\/p>\n<h3>1. Application Scope &amp; Mechanical Boundaries of Spring Lift Up Sofa Bed Hinges<\/h3>\n<p>When installing these triangular <strong>spring lift up sofa bed hinges<\/strong> into multifunctional furniture, precise counterbalance calculations ensure smooth, finger-light daily operation across top-lifting seat frames, folding ottoman lids, and modular daybed platforms:<\/p>\n<ul>\n<li><strong>Optimal Platform Weight Range:<\/strong> Best paired with wooden or metal sub-frames weighing between 18 kg and 38 kg per pair (balanced spring tension eliminates wrist strain during manual lifting).<\/li>\n<li><strong>Maximum Opening Arc:<\/strong> Engineered fixed opening angle of 80\u00b0 (\u00b12\u00b0) ensuring unobstructed access to under-bed storage cavities.<\/li>\n<li><strong>Structural Linkage:<\/strong> Riveted 4-bar linkage geometry prevents lateral racking and distributes mechanical torque evenly across the perimeter frame rails.<\/li>\n<\/ul>\n<div style=\"background-color: #fff3cd; border-left: 4px solid #ffeeba; padding: 12px 16px; margin: 20px 0; border-radius: 4px;\"><strong>CRITICAL ENGINEERING WARNING:<\/strong> Do not install these <strong>spring lift up sofa bed hinges<\/strong> on horizontal pull-out drawer boxes or sliding trundle frames without vertical clearance. Exceeding a mattress\/lid weight of 45 kg without auxiliary gas struts will cause premature spring overextension and permanent plastic deformation. Ensure at least 45 mm side-wall clearance inside the sofa cavity.<\/div>\n<h3>2. Technical Specification &amp; Structural Benchmarking<\/h3>\n<p>Compare the industrial-grade kinematic parameters of BLS Hardware&#8217;s <strong>spring lift up sofa bed hinges<\/strong> against generic commercial stamped brackets:<\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin-bottom: 25px;\">\n<thead>\n<tr style=\"background-color: #f8f9fa; border-bottom: 2px solid #dee2e6;\">\n<th style=\"padding: 12px; text-align: left; border: 1px solid #dee2e6;\">Engineering Criterion<\/th>\n<th style=\"padding: 12px; text-align: left; border: 1px solid #dee2e6;\">BLS Hardware (Zhengkai Factory)<\/th>\n<th style=\"padding: 12px; text-align: left; border: 1px solid #dee2e6;\">Standard Market Benchmark<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Primary Raw Material<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Cold-Rolled Carbon Steel Q235 (2.5 mm arms \/ 2.0 mm base)<\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Commercial Hot-Rolled Scrap Steel (&lt;1.8 mm)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Spring Engineering<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Oil-tempered 65Mn manganese steel helical springs (dual-side)<\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Low-grade carbon wire (prone to permanent tension drop)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Pivot Riveting Method<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Automated orbital hydraulic riveting with anti-friction POM washers<\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Manual punch hammer riveting (loose wobble after transit)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Corrosion Protection<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Electrostatic powder coating \/ cathodic electrophoresis (72h salt spray)<\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Thin flash dip paint (rusts within 24h salt spray exposure)<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Cycle Fatigue Life<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Exceeds 25,000 continuous full-stroke open\/close cycles<\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Fails under 8,000 cycles due to hinge arm buckling<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>3. Certified Factory Physical Parameters of Spring Lift Up Sofa Bed Hinges<\/h3>\n<table style=\"width: 100%; border-collapse: collapse; margin-bottom: 25px;\">\n<tbody>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 10px; border: 1px solid #dee2e6; width: 35%;\"><strong>Manufacturing Entity<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Zhaoqing Gaoyao Jinli Zhengkai Hardware Factory<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Export Window &amp; Brand<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">BLS Hardware (blshardware.com)<\/td>\n<\/tr>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Steel Thickness<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Mounting bracket: 2.0 mm | Articulating scissor arms: 2.5 mm<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Standard Lifting Angle<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">80 Degrees Nominal<\/td>\n<\/tr>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Surface Treatment<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">Matte Black Electrophoresis \/ Industrial Black Powder Coating \/ Bright Zinc Plating<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\"><strong>Packaging Configuration<\/strong><\/td>\n<td style=\"padding: 10px; border: 1px solid #dee2e6;\">1 Pair per PE protective bag; 25 Pairs per reinforced 5-ply export carton; Palletized for FCL\/LCL<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>4. Common Procurement Misconceptions in Hinge Sourcing<\/h3>\n<p>Through two decades of stamping and assembly at Jinli Industrial Zone, our engineering desk frequently corrects these two critical buyer assumptions:<\/p>\n<ol>\n<li><strong>Misconception: Stiffer springs always provide better sofa bed performance.<\/strong><br \/>\n<em>Engineering Reality:<\/em> Oversized spring wire diameter makes it almost impossible for end-users to push down and lock the seat cushion back into horizontal sofa configuration. The engineering art lies in precise counterbalance torque matched to the cushion weight, ensuring neutral hand-pressure operation.<\/li>\n<li><strong>Misconception: All black finishes provide equal moisture resistance in ocean freight.<\/strong><br \/>\n<em>Engineering Reality:<\/em> Conventional flash dip paint leaves microscopic bare metal pinholes at the spring coils and rivet crevices, causing rust spots inside shipping containers. BLS Hardware uses comprehensive cathodic electrophoresis and electrostatic curing to guarantee complete coverage across all moving pivot surfaces.<\/li>\n<\/ol>\n<div style=\"background-color: #e8f4fd; border: 1px solid #b6d4fe; padding: 16px; border-radius: 6px; margin: 25px 0;\">\n<h4 style=\"margin-top: 0; color: #084298;\">B2B Engineering Decision Takeaway<\/h4>\n<p style=\"margin-bottom: 0;\">Specify BLS Hardware&#8217;s <strong>spring lift up sofa bed hinges<\/strong> when your production line demands a zero-rework, drop-in storage lifting bracket backed by authentic Q235 steel certification and traceable Jinli factory manufacturing guarantees.<\/p>\n<\/div>\n<h3>Frequently Asked Procurement Questions (FAQ)<\/h3>\n<div style=\"margin-bottom: 15px;\">\n<p><strong>Q1: What is the minimum order quantity (MOQ) and production lead time for OEM branding?<\/strong><br \/>\nA: Standard stock items in black electrophoretic finish have an MOQ of 500 pairs (ready to dispatch in 5-7 business days). Custom arm lengths, custom hole pitches, or branded stamping have an MOQ of 2,000 pairs with an average 20-25 day production lead time from our Jinli factory.<\/p>\n<\/div>\n<div style=\"margin-bottom: 15px;\">\n<p><strong>Q2: Can we adjust the tension of these spring lift up sofa bed hinges for lighter cushions?<\/strong><br \/>\nA: Yes. We offer multiple coil wire gauges (ranging from 2.8 mm to 3.5 mm spring steel wire) and customizable spring hook mounting points on the main triangle bracket to match your cushion and frame density precisely.<\/p>\n<\/div>\n<div style=\"margin-bottom: 15px;\">\n<p><strong>Q3: How do you protect the hinges from rust and maritime corrosion during ocean shipping?<\/strong><br \/>\nA: Every pair undergoes industrial cleaning, automated electrophoresis or oven-cured powder coating, and is wrapped in heavy-duty poly moisture barrier bags containing silica gel desiccant packs before being packed into rigid 5-ply corrugated export cartons.<\/p>\n<\/div>\n<div style=\"background-color: #212529; color: #f8f9fa; padding: 22px; border-radius: 6px; margin-top: 30px;\">\n<h4 style=\"color: #ffc107; margin-top: 0;\">Factory Direct RFQ &amp; Technical Consultation<\/h4>\n<p>Connect directly with our Zhaoqing Jinli engineering and export team for CAD drawings (.step \/ .dwg), custom sample kits, and volume wholesale pricing for <strong>spring lift up sofa bed hinges<\/strong>:<\/p>\n<ul style=\"list-style-type: none; padding-left: 0; line-height: 1.8;\">\n<li>\ud83c\udfe2 <strong>Legal Manufacturing Facility:<\/strong> Zhaoqing Gaoyao Jinli Zhengkai Hardware Factory<\/li>\n<li>\ud83c\udf10 <strong>International Engineering Window:<\/strong> BLS Hardware (blshardware.com)<\/li>\n<li>\ud83d\udccd <strong>Production Base:<\/strong> Jinli Hardware Industrial Zone, Gaoyao District, Zhaoqing City, Guangdong Province, China<\/li>\n<li>\ud83d\udce7 <strong>Official Procurement Mailbox:<\/strong> <a style=\"color: #ffc107;\" href=\"mailto:ZK-ZhengKai@outlook.com\">ZK-ZhengKai@outlook.com<\/a><\/li>\n<li>\ud83d\udcf1 <strong>Direct WhatsApp Engineering Desk:<\/strong> <a style=\"color: #ffc107;\" href=\"https:\/\/wa.me\/8613827521875\" target=\"_blank\" rel=\"noopener\">+86 138 2752 1875<\/a><\/li>\n<\/ul>\n<\/div>\n<p><!-- FAQPage Structured Data (Mirrored 100% to avoid Google Rich Result Mismatch) --><br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the minimum order quantity (MOQ) and production lead time for OEM branding?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard stock items in black electrophoretic finish have an MOQ of 500 pairs (ready to dispatch in 5-7 business days). Custom arm lengths, custom hole pitches, or branded stamping have an MOQ of 2,000 pairs with an average 20-25 day production lead time from our Jinli factory.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can we adjust the tension of these spring lift up sofa bed hinges for lighter cushions?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 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Designed for smooth 80-degree assisted lifting in storage ottomans, trundle couch beds, and lift-up platform frames. Direct source factory supply from Zhaoqing Gaoyao Jinli Zhengkai Hardware Factory. <strong>100% sample fee fully deductible against first mass production container order.<\/strong><\/p>","protected":false},"featured_media":6842,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"jetpack_publicize_message":"{title}\r\n\r\n{excerpt}\r\n\r\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false},"product_brand":[],"product_cat":[20],"product_tag":[],"class_list":["post-6841","product","type-product","status-publish","has-post-thumbnail","product_cat-sofa-bed-hardware","desktop-align-left","tablet-align-left","mobile-align-left","first","instock","shipping-taxable","purchasable","product-type-simple"],"jetpack_publicize_connections":[],"jetpack-related-posts":[{"id":1816,"url":"https:\/\/blshardware.com\/ru\/product\/triangle-spring-hinge-for-sofa-storage\/","url_meta":{"origin":6841,"position":0},"title":"BLS Heavy-Duty Triangle Spring Hinge for Sofa Storage &#038; Bench Lids|BLS hardware","author":"BLS Hardware","date":"8 \u0438\u044e\u043b\u044f, 2026","format":false,"excerpt":"The\u00a0BLS-TS80\u00a0by\u00a0BLS Hardware\u00a0is a heavy-duty triangle spring hinge and spring-assisted lift mechanism designed for sofa storage compartments, Ottoman benches, storage cabinet lids, and drop-down doors. Precision-stamped from high-strength iron with a durable black powder-coated finish, this triangular scissor hinge features a high-tension steel coil spring that provides counterbalanced lifting support, keeping\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"BLS Hardware triangle spring hinge for sofa storage by BLS Hardware","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1783531432.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1783531432.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1783531432.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/img_alibaba1783531432.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":4675,"url":"https:\/\/blshardware.com\/ru\/product\/bls-heavy-duty-folding-sofa-bed-hinge-mechanism\/","url_meta":{"origin":6841,"position":1},"title":"Heavy-Duty Folding Sofa Bed Hinge Mechanism | BLS Hardware","author":"BLS Hardware","date":"27 \u0438\u044e\u043b\u044f, 2026","format":false,"excerpt":"Industrial-grade spring-assisted folding sofa bed hinge mechanism engineered for convertible futons, folding daybeds, and click-clack sleeper couches. Spring-Counterbalanced Folding: Dual high-tension manganese alloy extension springs balance backrest weight, enabling effortless 90\u00b0 to 180\u00b0 transition. Heavy-Gauge Flat Bar Steel: Stamped from 3.0mm \/ 3.5mm high-tensile Q235 cold-rolled steel linkages to resist\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"BLS HardwareFolding Sofa Bed Hinge Mechanism","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-folding-sofa-bed-hinge-heavy-duty-linkage-arms-pair.jpg?fit=750%2C750&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-folding-sofa-bed-hinge-heavy-duty-linkage-arms-pair.jpg?fit=750%2C750&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-folding-sofa-bed-hinge-heavy-duty-linkage-arms-pair.jpg?fit=750%2C750&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/bls-folding-sofa-bed-hinge-heavy-duty-linkage-arms-pair.jpg?fit=750%2C750&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":4452,"url":"https:\/\/blshardware.com\/ru\/product\/heavy-duty-sofa-bed-storage-lift-up-hinges\/","url_meta":{"origin":6841,"position":2},"title":"Wholesale Heavy-Duty Sofa Bed Storage Lift-Up Hinges (3mm\/4mm Thick) | BLS Hardware","author":"BLS Hardware","date":"24 \u0438\u044e\u043b\u044f, 2026","format":false,"excerpt":"Engineered by BLS Hardware (Guangdong Factory Direct), our BLS-2025 Heavy-Duty Sofa Bed Storage Lift-Up Hinges feature ultra-thick 3.0 mm \/ 4.0 mm cold-rolled carbon steel construction. Designed for high-frequency ottoman storage boxes, lift-up chaises, and multifunctional sofa beds with zero lateral sway. Model & Gauge: BLS-2025 | 3.0mm Linkage Arms\u2026","rel":"","context":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","block_context":{"text":"\u041f\u043e\u0445\u043e\u0436\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c","link":""},"img":{"alt_text":"Heavy-Duty Sofa Bed Storage Lift-Up Hinges (3mm\/4mm) | BLS Hardware","src":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/heavy-duty-sofa-bed-storage-lift-up-hinges-master-view.jpg?fit=800%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/heavy-duty-sofa-bed-storage-lift-up-hinges-master-view.jpg?fit=800%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/heavy-duty-sofa-bed-storage-lift-up-hinges-master-view.jpg?fit=800%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/heavy-duty-sofa-bed-storage-lift-up-hinges-master-view.jpg?fit=800%2C800&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":4477,"url":"https:\/\/blshardware.com\/ru\/product\/spring-sofa-storage-lift-hinge\/","url_meta":{"origin":6841,"position":3},"title":"Heavy-Duty 2.5mm Spring-Assisted Sofa Storage Lift-Up Hinges | BLS Hardware","author":"BLS Hardware","date":"24 \u0438\u044e\u043b\u044f, 2026","format":false,"excerpt":"Industrial-grade 2.5mm spring-assisted sofa storage lift hinge engineered for parallel elevation in modular sectional seats, storage chaises, and lift-top coffee tables. Substantial Solid Build: Stamped from 2.5mm Q235 cold-rolled structural steel (solid net weight: 1.686 kg per pair). 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