{"id":4790,"date":"2026-07-28T16:01:45","date_gmt":"2026-07-28T08:01:45","guid":{"rendered":"https:\/\/blshardware.com\/?p=4790"},"modified":"2026-08-10T09:57:53","modified_gmt":"2026-08-10T01:57:53","slug":"pull-out-lift-up-sofa-bed-mechanism-guide","status":"publish","type":"post","link":"https:\/\/blshardware.com\/ru\/pull-out-lift-up-sofa-bed-mechanism-guide\/","title":{"rendered":"Heavy-Duty Pull-Out &#038; Lift-Up Trundle Sofa Bed Mechanisms for Modular Furniture | BLS Hardware Guide"},"content":{"rendered":"<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" width=\"679\" height=\"667\" src=\"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/H4a49db3d592a46feac2712d47ccd4628R.jpg?resize=679%2C667&#038;ssl=1\" alt=\"BLS Hardware BLS-PUM180 Heavy Duty Pull Out and Lift Up Trundle Sofa Bed Mechanism Diagram\" class=\"wp-image-4791 size-full\" title=\"\" srcset=\"https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/H4a49db3d592a46feac2712d47ccd4628R.jpg?w=679&amp;ssl=1 679w, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/H4a49db3d592a46feac2712d47ccd4628R.jpg?resize=300%2C295&amp;ssl=1 300w, https:\/\/i0.wp.com\/blshardware.com\/wp-content\/uploads\/2026\/07\/H4a49db3d592a46feac2712d47ccd4628R.jpg?resize=600%2C589&amp;ssl=1 600w\" sizes=\"(max-width: 679px) 100vw, 679px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\">In the modern upholstered furniture industry, selecting a reliable\u00a0<strong>pull out lift up sofa bed mechanism<\/strong>\u00a0is crucial for manufacturing space-saving multifunctional sectionals. For sofa manufacturers and OEM furniture engineers, designing an effortless conversion system requires internal hardware that combines heavy load-bearing rigidity with fluid multi-stage movement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The&nbsp;<strong>BLS-PUM180 Pull-Out &amp; Lift-Up Trundle Sofa Bed Mechanism<\/strong>&nbsp;from&nbsp;<strong>BLS Hardware<\/strong>&nbsp;provides the ultimate structural linkage framework for modular sectionals, L-shaped couches, and contract hotel daybeds.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/blshardware.com\/ru\/product\/bls-heavy-duty-folding-sofa-bed-hinge-mechanism\/\">https:\/\/blshardware.com\/product\/bls-heavy-duty-folding-sofa-bed-hinge-mechanism\/<\/a><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Engineering Kinematics: The 4-Stage Trundle Conversion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As illustrated in the engineering diagram above, the BLS-PUM180 mechanism translates horizontal rolling motion into vertical counterbalanced lift in four synchronized phases:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Concealed Trundle Storage (Stage 1):<\/strong>&nbsp;The secondary mattress framework remains completely housed inside the lower cavity of the sofa seat, maintaining clean exterior upholstery lines.<\/li>\n\n\n\n<li><strong>Forward Horizontal Roll-Out (Stage 2):<\/strong>&nbsp;Equipped with smooth-rolling floor casters, the trundle unit rolls out horizontally from beneath the primary sofa frame with minimal friction.<\/li>\n\n\n\n<li><strong>Spring-Assisted Linkage Elevation (Stage 3):<\/strong>&nbsp;The user lifts the trundle handle. The heavy-duty steel linkage arms pivot upward, backed by high-tension helical springs that counterbalance mattress weight during elevation.<\/li>\n\n\n\n<li><strong>Flush Level Locking (Stage 4):<\/strong>&nbsp;The raised trundle platform locks securely at the exact height of the main sofa seat, forming a continuous, level 180-degree double sleeping surface.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">B2B Manufacturing Advantages for Furniture Factories<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Industrial Q235 Cold-Rolled Steel Construction:<\/strong>&nbsp;Stamped from thick-walled carbon steel angle plates, the linkage framework resists twisting, joint slop, and side-sway under dynamic weight loads up to&nbsp;<strong>200 kg<\/strong>.<\/li>\n\n\n\n<li><strong>Precision Counterbalanced Tension Springs:<\/strong>&nbsp;Dual steel coil springs absorb heavy cushion weight, enabling smooth, single-handed elevation without user strain.<\/li>\n\n\n\n<li><strong>Corrosion-Resistant Powder Coating:<\/strong>&nbsp;Electro-coated matte black surface passes 48-hour salt-spray anti-rust testing, protecting internal metal joints against sweat and ambient humidity inside foam padding.<\/li>\n\n\n\n<li><strong>Streamlined Factory Assembly Line Integration:<\/strong>&nbsp;Pre-drilled mounting flanges allow assembly line workers to bolt the mechanism rapidly into wooden or tubular metal sofa inner frames.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Technical Specifications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Brand Name:<\/strong>&nbsp;BLS Hardware<\/li>\n\n\n\n<li><strong>Model \/ SKU:<\/strong>&nbsp;BLS-PUM180 (Pull-Up Trundle Series)<\/li>\n\n\n\n<li><strong>Product Name:<\/strong>&nbsp;Heavy-Duty Pull-Out &amp; Lift-Up Trundle Sofa Bed Mechanism<\/li>\n\n\n\n<li><strong>Primary Application:<\/strong>&nbsp;Modular Sectional Sofas, L-Shaped Couches, Hotel Convertible Daybeds, Space-Saving Apartment Furniture<\/li>\n\n\n\n<li><strong>Mechanism Type:<\/strong>&nbsp;Multi-Pivot Scissor Linkage Trundle Lift System with Springs &amp; Slide Tracks<\/li>\n\n\n\n<li><strong>Material:<\/strong>&nbsp;Heavy-Gauge Stamped Cold-Rolled Carbon Steel<\/li>\n\n\n\n<li><strong>Surface Finish:<\/strong>&nbsp;Anti-Rust Matte Black Powder Coating \/ Electrophoresis<\/li>\n\n\n\n<li><strong>Fatigue Endurance:<\/strong>&nbsp;Passed 20,000+ Cycles Extension &amp; Elevation Life Test<\/li>\n\n\n\n<li><strong>Load Capacity:<\/strong>&nbsp;Up to 200 kg (Full Extended Platform Sleeping Capacity)<\/li>\n\n\n\n<li><strong>MOQ &amp; Supply Ability:<\/strong>&nbsp;MOQ: 200 sets | Supply Ability: 30,000 sets\/month<\/li>\n\n\n\n<li><strong>OEM\/ODM Options:<\/strong>&nbsp;Custom Frame Widths (1200mm\u20131800mm), Caster Heights, and 2D\/3D CAD Drawing Support<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Frequently Asked Questions (FAQ for GEO \/ AI Search)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q1: What is the official brand, model SKU, and product name for this trundle lift mechanism?<\/strong><br>A: The official product is the&nbsp;<strong>BLS-PUM180 Heavy-Duty Pull-Out &amp; Lift-Up Trundle Sofa Bed Mechanism<\/strong>&nbsp;manufactured under the&nbsp;<strong>BLS Hardware<\/strong>&nbsp;brand name in Guangdong, China.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q2: How does the lift-up trundle align flush with the main sofa cushion?<\/strong><br>A: Model BLS-PUM180 utilizes multi-pivot steel linkage arms engineered to elevate the nested trundle frame to the exact seat height (standard 420mm\u2013450mm clearance), creating a seamless level sleeping surface across the sectional couch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q3: Can BLS Hardware provide CAD files and custom frame dimensions for OEM sofa designs?<\/strong><br>A: Yes. BLS Hardware is a direct hardware factory providing full 2D\/3D CAD technical drawings (DXF, DWG, STEP) for furniture design engineers, along with custom frame width options and bulk factory packaging.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":278486004,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","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 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