US2602489A - Adjustable chair - Google Patents

Description

July s, 1952 C. HOLTEN 2,602,489

ADJUSTABLE CHAIR Filed April l, 1947 2 SHEETS-SHEET l "gin 10 fln SNVENTOR JOHN C. HQLTEN ATTORNEYS.

J. c. HOLTEN 2,602,489

ADJUSTABLE CHAIR July 8, 1952 Filed April l, 1947 2 SHEETS- SHEET 2 1 FIG,

NvaNToR JOHN C. HoLTf-:N

12v @www ATTORNEYS.

Patented July S, 1952 UNITED STATES PATENT forties# Anrusrngogsrg 1 Y t' Y Application April 1, 1947, sensi No. 738,633 A 6' claims. l (o1. 155.461)

My invention comprises a new and simplified seat and back supporting frame assembly for a chair having :an adjustable back Such chairs are well known, being generally vused by office workers, particularly stenographers; but existing constructions which afford an equal degree of adjustability are unduly complicated and expensive to manufacture, and since they are constructed from a large number of separate parts, corren spondingly are subject to derangement. My invent-ion aims to simplify and lighten the seat frame and back adjustment assembly, and to reduce the cost of manufacture of chairs of Athis general type. With constantly increasing Alabor costs it becomes more and more necessary to reduce the hours of labor required to manufacture and assemble such chairs and my invention represents a substantial advance in this art. A further advantage of such simplified constructionv is that with fewer parts there is less opportunity for any of said parts to work out of adjustment and consequently fewer repairs are necessary and maintenance costs are lowered.

A preferred form of my invention is shown in the attached drawings, in which: lFigure l is a perspective view plete chair embodying my novel assembly; f Y

Figure 2 is a cross-sectional view taken along the line 2-2 of Figure 3, looking in the direction of the arrows; and f v A Figure 3 is a bottom plan view showing the spiderl and backframe tension and inclination adjustments. y

Similar numerals refer to similar parts throughout the several views.

Referring to Figure trated as embodied in a stenographers chairhaving a cushion seat 5 and adjustable backrest carried by ears showing a comseat and back 1 which are pivotally and sldably mounted in slots 8 in the bracket 5 on the back frame l l. This is accomplished by means of bolts passing through said ears 1 and slots 8, and capped by adjustable nuts l0. It will thus be seen that by loosening the nuts lil, the backrest may be adjusted to any angle and height desired, and then secured in this position by simply tightening the nuts l0. The chair base l2 is supported on legs I3, preferably provided with casters, and has a central vertical bore in which is mounted a standard I4, the height of which standard may be adjusted by means of the hand bolt I5, the inner end of which bears against the surface of said standard lil. At the top of the standard an integral four-armed spider IE is provided in order ,10 cylinder.

l, the invention is illusto support the seat 5, and the Vends of the two rearwardly projecting arms of said spider are formed into generally U-shaped pivot receiving means I1 for supporting the back frame Il. `IThe IB is extended downwardly, forming a Y l iS within which the upper vend of the standard I4 is rotatablea steel ball I9 being interposed between the top of the the hollow cylinder l8`of thek seat frame by` means of a set-screw ZQthe pointof which engages in a groove 2l in the standard i4 as shown in FigureV 2. The back frame is made of tubing in two parts, the upper part Il being steel or aluminum, and the lower part 22 being steel, connected by steel plugs 23 which are drilled to receivethe pivot pins y 2d which secure the back' frame in the U-shaped extremities l1 of the rear arms of the spider. The go side limbs 25 of the lower part ofthe back frame pass loosely between the branches of the llshaped extremities l1 of the rear arms of the spider and are securely held for pivotal movement therein by the pivot pins 24 The bottom of the back frame passes transversely through a sleeve fitting 26 at its middle point, in which it fits snugly but with suicient clearance to permit itto turn slightly. This sleeve 26 is assembled on the frame tube 22 before the ends of the latter are'bent to engage with the Liv-shaped pivot arms of the spider;Y Y

an adjusting screw 21, on its outer end, 4 bore in a lug on the upper side of the ysleeve 25 vfor adjusting'the inclination of the back frame. The inner end of this screw 21 is rotatably secured to the end of a yoke 29 surrounding the hollow stem I8 of the seat frame. In the form of theV invention shown the screw 21 has its inner end journalled in alining holes in the yoke 2B, which is formed with a double Wall at one end by Welding an outer plate 30 against its end, as shown in Figure 3. The adjusting screw has a square head 3l engaging between the plate 30 and the end of the swivel 29 so that it may rotate freely, but is prevented from slipping out by the head 3 I t Near the lower edge of said cylinder i8 and in axial alinement with the adjusting screw 21, a horizontal threaded aperture is provided extending through the front wall `of the cylinder, the outer edge of said aperture being surrounded by a raised boss having a hat front surface, and this aperture fixedly supports a pin 32, threaded at each end. The pin 32 passes through a regis- 55 tering aperture 33 in the front end of the yoke having' a hand wheelZSr is threaded through a transversey 29 and is encircled by is retained by an adjusting spring.

From this it will be seen that by rotating the adjusting screw 21 by means of its handle 28 the sleeve member 26 t Y. in the back may by varying the pressure exerted on the helical Spring 34 by loosening,

the nut l35, which may readily 'be done by the occupant of the chair by turning the handle ,36. one way or the other.

By 4meanstofV this construction I eliminate the 0I tightening necessitated two Aseparate sub-asseinbliesf What I claim iS: 1. In a chair,

member'at the other end. v Y

4. A chair seat and back assembly as described in claim 3 wherein the seat frame is a unitary member provided with integral pivot supports 5. In a chair, a supporting standard, a seat frame mounted thereon, a backrest pivotally Connected to said seat frame, a horizontal member rotatablymounted on JoHN o. HOLTEN.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,734,179 Olson Nov. 5, 1929 2,208,561 Jnngbauer July 23, 1940 2,249,750 Dickson July 22, 1941 2,271,330 Dickson Jan. 27, 1942 2,298,886 Hunting O'ct. 13. 194.2

FOREIGN PATENTS Number Country Date 36711015. Italy

Images