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Class Information
Number: 5/233
Name: Beds > Bedsteads > Having bottom > Of fabrics and springs > Marginal spring tension
Description: Devices arranged to exert outward marginal pull upon the fabric and allow sag under weight. Frequently the fabric passes over rollers to attaching springs beneath.

Patents under this class:

Patent Number Title Of Patent Date Issued
4630816 Jogging apparatus Dec. 23, 1986
4452444 Rebound exerciser Jun. 5, 1984
4284271 Hexagonal jogging platform Aug. 18, 1981
4162063 Adjustable springs for trampolines and the like Jul. 24, 1979

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