US2217290A - Spring unit - Google Patents

Description

Oct. 8,- 1940- H. P. NORDMARK snuua mm Filed April 14, 1939 Patented oer. s, 1940 v 2,217,290

UNITED STATES. PATENT, OFFICE SPRING UNIT Henry P. Nordmark, Grand Rapids, Mich, assignor to American Seating Company, Grand Rapids, Mich, a corporation of New Jersey Application April 14, 1939, Serial No. 267,791

Claims. (or. 155-479) The present invention relates to spring units hooks I2 in the manner illustrated in Figure 1, and more particularly spring units for supportthe springs are secured to the frame even against ing chair seats or chair backs. pressure thereupon.

The primary objects of the instant invention It will thus be seen that the spring unit herein 5 are to provide improved means for securing a shown and described may be readily and con- 5 plurality of springs of the general character veniently assembled, is sturdy in construction shown in Kaden Patent No. 2,002,399 within a and may be economically manufactured. seat or back frame of a chair; to provide an im- While but one specific embodiment of the inproved form of seat or back frame for a chair vention has been herein shown and described, it

[0 having means for readily manually detachably will be understood that certaindetails of the securing a plurality of such springs therewith; construction shown may be altered or omitted and, to provide such a unit which is sturdy in without departing from the spirit of this invenconstruction and economical in manufacture. tion as the same is defined by the following An illustrative embodiment of the invention is claims. shown in the accompanying drawing, wherein: I claim: I 15 Figure 1 is a perspective View of a, frame to 1. A supporting frame comprising a rim havwhich springs of the general character shown I ing a pair of its opposite sides each provided in the above identified patent have been secured; with a like. plurality of spaced and outwardly Figure 2 is an enlarged sectional view on line projecting tongues forming oppositely disposed 2-2 of Figure 1; conpanion pairs of open spring retaining hooks, 20

Figure 3 is an enlarged sectional view on line and an outwardly bowed spring disposed between 3-3 of Figure 1; and each companion pair of hooks whose opposite Figure 4 is a side elevational view of a single ends are detachably secured thereby, said springs spring of the type shown in Figure 1, showing each having a permanent set on an arc of greater in full lines the approximate arc of curvature the curvature than the spring assumes after its as- 25 spring is caused to assume when secured to its sembly with the frame.

frame and showing in dotted lines the arc of 2. A supporting frame comprising a stamped curvature of its permanent set prior to its assheet metal rim having a pair of its opposite sembly with its frame. sides each provided with a like plurality of spaced Referring then to the drawing wherein like and outwardly projecting tongues struck there- 30 parts of the unit shown are designated by the from to form oppositely disposed companion pairs same numerals in the several views, the spring of open spring retaining hooks, and an outwardly supporting frame for a chair seat or back combowedspring disposed between each companion prises the rim generally designated 10, preferably pair of hooks whose opposite ends are detachformed of stamped sheet metal. ably secured thereby, said springs each having a 35 A pairof the opposite sides of the sheet metal permanent set on an arc of greater curvature rim I!) are each provided with an inwardly than the spring assumes after its assembly with flanged strengthening portion H which flanged the frame. portions are each reversely turned and equidis- 3. A frame for supporting a plurality of spaced tantly notched along the ot er two opposite sides parallelly disposed springs comprising a stamped 40 thereof to form oppositely disposed and equally sheet metal rim having a pair of its opposite sides spaced companion pairs of spring retaining each provided with an inwardly flanged strengthn ues 0 hooks l2. ening portion which flanged portions are each A plurality of spaced parallelly disposed, outreversely turned and equidistantly notched along wardly bowedsprings l3, here shown as of the the other two opposite sides thereof to form oD- tortuous or sinuous type, are disposed between positely disposed companionpairs of open spring companion pairs of hooks to which their opporetaining hooks, each companion pair of hooks site ends are secrued. Since these springs have being adapted to secure the opposite ends of an a permanent set onan arc of greater curvature outwardly bowed spring having a permanent set than the spring assumes after its assembly with on an arc of greater curvature than the spring 50 'the frame Ill, each spring when sprung from its assumes after its assembly with the frame. permanent set shown in dotted lines in Figure 4 4. A supporting frame comprising a stamped to the arc of curvature shown in full lines in the sheet metal rim having a pair of its opposite same view and thereafter secured between and sides each provided with an inwardly flanged by an oppositely disposed companion pair of strengthening portion which flanged portions 55 are, each reversely turned and equidistantly notched along the other two opposite sides thereof to form, oppositely disposed companion pairs of spring retaining hooks, and an outwardly bowed spring disposed between each companion pair of hooks whose opposite ends are secured thereby, said springs each having a permanent set on an arc of greater curvature than the spring assumes after itsassembly with the frame.

5. A supporting frame comprising a rim having a pair of its opposite sides each provided with a like plurality of spaced and outwardly projecting ton ues forming oppositely disposed companion pairs of open spring retaining hooks, and an outwardly. bowed sinuous spring disposed between each companion pair of hooks whose opposite ends are detachably secured thereby, said sinuous springs each having a permanent set on an arc of greater curvature than the spring assumes after'its assembly with the frame;

HENRY P. NORDMARK

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