US1694617A - Chair - Google Patents

Description

Dec. 11, 1928. 1,694,617

c. A. BROWN Filed Feb. 2, 1927 2 Sheets-Sheet 1 2 Sheets-Sheet 2 CHAIR n a ffin Dec 11, 1928'.

C. A. BROWN Filed Feb. 2, 1927 17727577707: C/uz rjes 1. B r0 w/v 7 Patented Dec. 11, 1928.

CHARLES BROWN, OF GARDNER, MASSAOHUfiET'lS, ASSIGEJQR TOE FIELD COMPANY, 013 BOSTON, MASSACHUSETTS, A CUBIOBATIQI? SETTS.

iteaerz CHAIR.

Application filed February 2, 1927.

The present invention relates to chairs of the adjustable type, wherein the seat unit of the chair has a screw threaded connection with the base or leg structure, to permitraising or lowering of the seat with reference to the supporting floor.

The invention resides in certain improvements in the construction and assemblage of the base or leg portion of such a chair, with particular reference to the retention therein of the internally threaded metal nut member which receives the screw that is attached to the seat,the general object being to mini- 'mize the weight of this base structure, with no sacrifice of its strength and rigidity, all as more fully set forth hereinafter with reference to the accompanying drawings, in which Fig. 1 is a. front elevation, showing an ad justable chair in which the improvements of the present invention are incorporated.

Fig. 2 is an enlarged sectional view of the base or leg structure.

Fig. 3 is an enlarged top plan view of the structure shown in Fig. 2.

Fig. i is an enlarged sectional View on line 41-, Fig. 2, showing details of the assemblage of the internally threaded metallic nut member with the legs of the base.

Fig. 5 is an enlarged cross sectional view on the line 55 of Fig. 2.

Fig. 6 is a similar view, the sect-ion being taken on the line 6-6 of Fig. 2.

Like reference characters refer to like p arts in the difierent figures.

As shown in the drawings, the base or leg structure of the chair is of a general type now in ordinary use, consisting essentially of four bent wood legs 1, 1, which are arranged equidistantly about acentral axis and which diverge at their lower ends to form supporting feet 2, 2; in the manner common to bent wood structures of this character, the legs 1, 1 are braced by means of a corresponding number of bent wood members 3, 3, the latter preferably being encircled by a bent wood ring 4, adapted to serve as a foot rail for the user of the chair.

In bent wood base structures of this type heretofore used, the internally threaded nietallic nut member to receive the screw 5, attached to and proj ectingdownwa rdly from the seat unit 6, has been held by the upper portions of the legs 1, 1,-said internally thread- Serial No. 185,484.

ed member usually takin the form of a heavy casting provided externally with ongitudinal undercut grooves into which the cories 20nding longitudinal tongues on the inner faces of the legs 1, 1 were forced. in coi suction such as just described, the internally threaded member must be extremely heavy; moreover, the forcing of the wooden leg tongues into the grooves of such a rough casting frequently results in breakage of the or of the casting in the assembling process; and the resulting structure is one that liable to warpage or loosening, due to expansion or contraction of the wood in the absence of similar changes in the metal.

According to the present invention, the usual heavy metallic casting employed for the internally threaded screw-receiving member is replaced with a light steel tube '1', the construction of which is best shown in Fig. l. Said tube 7, which dispenses entirely with the heretofore-used leg-receiving external grooves, can be made conveniently on a screw machine from a. piece of steel of square section, since its essential features are the usual internal thread 8, (which, being of steel, resists wear by the steel screw 5) and externally, a. pair of squared collars 9 and 10, each slight ly removed from the opposite ends of the tube; beyond these collars are the short cylindrical tube sections 11 and 12, respectively, and between these collars the tube is preferably reduced to cylindrical section for the sake of lightness.

From its extreme upper end, adapted to lie flush with the upper surface of square collar 9, each bent wood leg 1 presents an internal plane surface 13, which extends downwardly to a point flush with the under surface of square collar 10,the width of this plane surface 13 being coextensive with an edge of the square collars. The lower edge of each plane surface 13 is defined in each 1 by a. shoulder 14, the latter being formed by removing the stock of the leg below said surface, as by means of a longitudinal cut or recess 15 in each leg. The four sides or edges of the square collars 9 and 10 thus constitute abutments against which are opposed the four legs 1, 1,the assembly of the latter in a rigid structure around the tube 7 being accomplished in the following manner A four-armed metallic spider 16, 3, is centrally apertured so as to be received upon Hill the upper tube section 11, and each arm of this spider overlies the upper end of one of the legs 1, 1,-the material of said spider preferably being flanged downwardly the outer end and on the two sides of eacl arm, as shown at 17, to form a soclret that sn gly fits over the upper end of the correspo ding leg 1. A plate 18, Fig. 5, is centrally tured so as to be receive tube section 12, plate thus bear 1%, 1e; of the legs 1.

nider 16 and plate 18, for the ion of the leg portions elongated bolts 19, 19 are emploved, e preferably havi sl sqnarcd section 21,t apertire of spider 1o to prevent id from turning. hole in each leg ser i said bolt 19, Whose oiver end, projecting through a correspond'ng hole in the plate 18, is threaded to receive a retaining nut- 22. These nuts 22 are accessibl for tigl'itening, as by means of a socket \FBllCll, or th which is given sufiicient space in which 1. Work by the cuts or recesses 15, of legs 1, 1,-it being understood that for this purpose a leg brace 23, it used, may be temporarily removed. Each bent Wood leg 1 is firmly d upon the lower corners of thls and the four ae'ainst the four s To bind t L ouldcrs the DOLL

esser? sembly, in a manner which eliminates an possibility of relative longitudinal motion, or lateral or radial play, and it will also be seen that expansion or contraction of the Wood of the legs, which takes place across t is grain and hence at right angles to the bolt 19, can in no way affect the rigidity with which the parts are held together.

1 claim:

In a chair of the class described, a

member having an internally threaded bore, for the. reception of a threaded seat spindle.

id tubular member being formed near ea end with a polygonal. collar, and beyond eacn collar with a short tubular extension of circular cross section, chair legs radiating from he axis oi said tubular nien'iber, and each CHAR ns A. BROWN.

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