{"id":17098,"date":"2020-06-15T10:45:00","date_gmt":"2020-06-15T09:45:00","guid":{"rendered":"https:\/\/www.engineernewsnetwork.com\/blog\/?p=17098"},"modified":"2020-06-11T10:49:57","modified_gmt":"2020-06-11T09:49:57","slug":"constant-force-constant-load","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/constant-force-constant-load\/","title":{"rendered":"Constant force, constant load"},"content":{"rendered":"\n

Ex-stock constant force springs from Lee Spring<\/a><\/strong> offer a flat force curve over most of its extension range. It is this major \u2018table-top mountain\u2019 shape of force curve which ensures their value for certain applications. These include counterbalances, door closers, cable retractors, hose retrievers, tool head returns, cabinet & furniture components, gym equipment, hair dryers, toys, electric motors, appliances, space vehicles, and other long-motion functions.<\/p>\n\n\n\n

Motor springs are used for cable retraction, power generation etc.  <\/p>\n\n\n\n

Power springs are used for retracting applications such as seat belt webbing, tape measures and dog leads, seat recliner, window regulator mechanisms etc.<\/p>\n\n\n\n

Where higher loads are encountered then multiple mounting can be used to increase force. <\/p>\n\n\n\n

Constant force springs mounted back-to-back make the sum of their forces available at one point. This method also provides stable extension over long deflections.\u00a0<\/p>\n\n\n\n

Tandem mounting makes the sum of two spring forces available at a single point while pulley mounting doubles the force of a single constant force spring. Laminar mounting, inter-winding of two or more springs as an assembly, offers the sum of their forces in a minimum of space.<\/p>\n\n\n\n

Lee Spring offer constant force springs in four Life Cycle ranges where each spring is a roll of high yield Type 301 Stainless Steel strip exerting a nearly constant restraining force to resist uncoiling. <\/p>\n\n\n\n

When the strip is extended, the inherent stress resists the loading force at a nearly constant rate.<\/p>\n\n\n\n

Considerable flexibility is possible with constant force springs because the load capacity can be varied by using different mounting configurations such as cavity mounts, multiple spring mounts, etc. <\/p>\n\n\n\n

Constant force springs are available in a wide variety of sizes and end configurations to suit the design situation.<\/p>\n\n\n\n

Many variations of constant force spring are possible over and above the simple increase in size, thickness, diameter etc. For example, doubling up by back-to-back mounting which not only doubles the available force but also<\/p>\n\n\n\n

increases stability; tandem mounting which doubles force and laminar mounting which doubles the force in a limited space.<\/p>\n\n\n\n

Typically, stainless steel Type 301 is selected, but high-carbon steel, Inconel and other materials are also suitable for constant force springs.<\/p>\n\n\n\n

Fatigue life of these springs range from 2,500 cycles to over a million cycles depending upon the load and size of the spring. <\/p>\n\n\n\n

Working deflections of 50 times the drum diameter can be achieved and these springs are often considered much easier to handle than a conventional wire spring.<\/p>\n","protected":false},"excerpt":{"rendered":"

Ex-stock constant force springs from Lee Spring offer a flat force curve over most of its extension range. It is this major \u2018table-top mountain\u2019 shape of force curve which ensures their value for certain applications. These include counterbalances, door closers, cable retractors, hose retrievers, tool head returns, cabinet & furniture components, gym equipment, hair dryers, …<\/p>\n","protected":false},"author":1,"featured_media":17099,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[4341,821],"class_list":["post-17098","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-design","tag-constant-force-springs","tag-lee-spring"],"yoast_head":"\nConstant force, constant load - Engineer News Network<\/title>\n<meta name=\"description\" content=\"Lee Spring offer constant force springs in four Life Cycle ranges where each spring is a roll of high yield Type 301 Stainless Steel strip\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engineernewsnetwork.com\/blog\/constant-force-constant-load\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Constant force, constant load - 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