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A History of Producing Quality Seat Springs
For over 75 years, the name No-Sag® has been synonymous with seating springs. From the very beginning, leadership in engineering, innovation, quality, service, and reaction to customers’ needs has been the by-word.
As part of the Leggett & Platt® team, this tradition continues. Four large and modern manufacturing facilities serve our customers coast to coast, and are reinforced by a sales and engineering group with years of experience and expertise.
Our pledge to excellence is our commitment to the industry.
No-Sag® springs are engineered and precision-formed to assure a lifetime of trouble-free performance. Special-formula high-carbon, high-tensile wire is structured for shipment in continuous coils, cut lengths, or bent shapes. When uncoiled, stretched, and anchored, the arc of sinuous spring wire provides wire-span progressive resilience and positive comfort. Called “the springs with unfailing memory,” No-Sag® sinuous springs outsell and outperform all competitors.
No-Sag® introduced this improved springing concept in 1934. Today, No-Sag® is being widely copied by manufacturers who have attempted to duplicate the very exacting and ever-uniform qualities of No-Sag® springs. No-Sag® field engineers are constantly available to assist manufacturers of furniture and seating to improve comfort, achieve better appearance, and cut costs. This commitment to impeccable field service and superior products have assured No-Sag® a leadership place among producers of furniture and bedding; automotive and truck seating; plane and train requirements; theater seating; and other applications requiring balanced, uniform performance and freedom from maintenance problems.
With No-Sag® springs, suggested installation and approximate lengths, arcs, and gauges are shown by the tables included in this manual. Clips, helicals, links, and other accessories are also explained here.
Original No-Sag® Loop SpringsThe basic sinuous spring for upholstery operations has been manufactured by No-Sag® since its introduction to the U.S. in 1934.Gauges: 8 to 12 (.5 ga. increments)
XL Loop SpringsThe same width as Original Loop Springs but the distance between bars is greater. XL Loop is firmer and more economical than Original Loop. It is recommended where the full action of Original Loop is not needed.Gauges: 7.5 to 12 (.5 ga. increments)
Supr-Loop SpringsThe spring for minimum cost, moderate action, and maximum coverage. Supr-Loop is ideal for backs and under coil spring units including “tight seat” applications.Gauges: 7.5 to 12 (.5 ga. increments)
No-Sag® springs are offered in three different variations to suit the requirements of different styles, applications, and economies.
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Selecting the Right Springs
No-Sag® springs (in either cut lengths or continuous coils) are available in .5 gauge increments from 8 to 12 gauge wire. Select exactly the right springing for your seat and back construction variations.
Shown below are the steps in the normal spring-measuring procedure. With usual construction, it may save you time and money to call in one of our field experts.
To Measure the FrameNo-Sag® springs are normally installed front-to-rear on seats and top-to-bottom on backs. Side-to-side springing, however, can be used with excellent results.
To determine gauge, length, number of springs, and spacing, measure the inside rail openings and refer to our chart on springing steps.
Crown Spring specifications from charts will provide a crown of 1.25” to 2”, depending on gauge and length of spring. Amount of crown above rails will permit approximately same amount of deflection below rails when under load and properly cross-tied. Total deflection will be about double amount of crown.
Low Crown For lower crown and less total deflection, deduct .25” to .75” from spring length, depending on overall length.
To Measure Cut LengthsPlace one end of the unanchored No-Sag® spring on a yardstick against its curvature. Roll back until spring lies flat. The distance between the outside of each end is the correct length. Do not use tape rule to measure spring length around outside of spring in unanchored position. This measurement will be inaccurate.
Note: 1. Each .5” increase or decrease in spring length will increase or decrease crown approximately .25”.
2. The length of back springs can be longer than the inside dimensions between the rails, as back springs support less body weight and can be crowned up to 3.5” when properly cross-tied.
3. Any significant deviation from the above guidelines can create problems. For example, excessive crown may result in “pocketing.”
Caution: Care should be exercised when opening arc of spring for measuring. The tempered spring will snap back to original shape and could cause injury if not firmly held.
A
C
B
4”
2”
2”
D
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Caution: If higher-than-standard crown is to be used in seats, proper cross-tying and greater seat pitch are recommended to create proper support throughout the platform.
Lasting Frame Construction
The majority of well-built, glued, and doweled frames will require little or no changing to withstand the “live pull” of No-Sag®.
Following are construction details that will provide the best type of frame for No-Sag® spring installations.
1. Front and rear rails of seats should not be less than 1” thick and preferably of hardwood.
2. Front and rear rails should extend over the ends of the side rails whenever possible so that the “live pull” of the No-Sag® springs will not cause separation at these joints. With this construction, nails, screws, or dowels can be used as preferred (Fig. A).
3. Where the rails cannot be extended over the sides or where legs do not brace the rails, corner blocks are essential. These should be set no further than 1” from the top of rails (Fig. B).
4. If dowels are used in the back and front rails, they must be placed one near the top, and one near the bottom of each rail. These precautions will prevent turning of the rails under the “live pull” of No-Sag® (Fig. A).
5. The longer frames of loveseats should have one center brace or stretcher. Full-size sofas should have two equally spaced stretchers. These stretchers should either be on edge, sawed with at least a 3” concave dip (Fig. C), or be a flat, straight stretcher with corner blocks at front and rear, securely doweled and glued (Fig. B). These blocks should reach the tops of front and rear rails and have approximately a 6” base (Fig. D).
6. The deflection of No-Sag® springs equals or slightly exceeds the elevation or height of the No-Sag® crown. Space for the deflection must therefore be provided accordingly (Fig. E).
Fig. A
Fig. B
1”
Fig. C
Fig. D
Fig. E
4”
2”
2”
3”
3.5” 5”
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Lasting Frame Construction
Loop and Radii Specifications
Pitch of Frame Seating comfort is enhanced by giving frames extra pitch or tilt, i.e., dropping rear rail lower than front rail.
With this increased pitch, particularly on modern tight seats, a higher No-Sag® crown is recommended. This provides deeper spring action and more restful posture.
When the pitch of the seat is increased, the back should be angled proportionately.
Locating Back Rails Spring action is improved when frames are designed with pull-up strip (bottom rail of back) located from 1” to 3” ahead of the rear seat rail. The main weight will then be applied where No-Sag® arc has deepest deflection in both seat and back.
A. Standard Radii Standard radii should be used for most requirements.
Original No-Sag®: 3.75” +/- .5” XL: 4.75” +/- .5” Supr-Loop: 7.50” +/- .5”
B. Special Radii
Special radii can be used for installations requiring a crown lower than standard. In general, larger radii will give a lower crown; however, the wire gauge may have to be increased and the spring length shortened to give the same support characteristics of a standard radius spring.
C. Length Tolerances
+/- .125” on lengths up to 20”
+/- .250” on lengths over 20”
Note: Since distances between parallel bars vary, loop count cannot be used as a measurement of length.
B Special Radii
A Standard Radii3.75”, 4.75”, or 7.5 (+/-.5”)
175”+/- 3”
6” – 8”
105˚
2” – 4”
50”+/- 2”
35”+/- 2”
11”+/- 1”
C
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Guide to Proper Spring-Upfor Sofa and Chair Seats
Space springs on frame by first positioning the outside strands and then dividing the remaining area in equal parts as suggested by the charts below. Spacing is calculated from center to center of clips.
Use this chart for determining number of springs, spacing of clips, and size of paper-covered stabilizer wire for loose cushion seat.
Distance between arms along front seat rail
Number of strandsCenter-to-centerspacing of clips
Center spacing of two outside clips from inside
arm posts
Paper-covered wire cross-brace main span
Original Loop Springs
20” 5 4.125” 1.75” 18.5”
22” 5 4.625” 1.75” 20.5”
24” 5 5.125” 1.75” 22.5”
XL Loop Springs
20” 5 4.125” 1.75” 18.5”
22” 5 4.625” 1.75” 20.5”
24” 5 5.125” 1 75” 22.5”
Supr-Loop Springs
20” 4 5” 2.5” 18”
22” 5 4.375” 2.25” 20.5”
24” 5 4.875” 2.25” 22.5”
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Distance between arms along front
seat railNumber of strands
Center-to-center spacing of clips
Center spacing of two outside clips from inside arm posts
Dim. BPaper-covered wire
cross-brace main span
Original Loop Springs
48” 10 5.5” 1.75” 3” 46.5”
52” 11 5.25” 1.75” 3.25” 50.5”
72” 15 5.25” 1.75” 2.75” 70.5”
86” 18 5.125” 1.75” 2.8125” 84.5”
XL Loop Springs
48” 10 5.5” 1.75” 3” 46.5”
52” 11 5.25” 1.75” 3.25” 50.5”
72” 15 5.25” 1.75” 2.75” 70.5”
78” 17 4.875” 1.75” 3.125” 76.5”
86” 18 5.125” 1.75” 2.8125” 84.5”
Supr-Loop Springs
48” 10 5” 2.5” 4” 46”
52 11 5” 2.25” 3.75” 50.5”
72” 15 5” 2.25” 3.75” 70.5”
78” 16 5” 2.5” 4” 76”
86” 18 4.875” 2.75” 3.6875” 83.5”
Guide to Proper Spring-Upfor Sofa and Chair Seats
Note: Leggett & Platt® suggests using 12 gauge PCW in seat applications where paper-covered wire is specified.
Use this chart for determining number of springs, spacing of clips, and size of paper-covered stabilizer wire for loose cushion seat.
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P.O. Box 757 • 1 Leggett RoadCarthage, MO 64836Ph. (800) 888-4569 or (417) 358-8131Fax: (417) 358-6996 [International 1-(417)-358-6667]E-mail: [email protected] ([email protected])www.HomeFurnitureComponents.com
US Locations
California16040 Stephens St.City of Industry, CA 91745Ph. 626-330-4150Fax 626-855-1016
Indiana2225 Production Rd.Kendallville, IN 46755Ph. 260-347-2600Fax 260-347-4764
MississippiArk-Ell Springs101 Industrial Dr.Houlka, MS 38850Ph. 662-568-3393Fax 662-568-3325
North Carolina1430 Sherman Ct.High Point, NC 27260Ph. 336-889-2600Fax 336-887-9099
© 2011 Leggett & Platt, Incorporated • 10236_150_1-11
