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Publication numberUS2668580 A
Publication typeGrant
Publication dateFeb 9, 1954
Filing dateMay 9, 1949
Priority dateMay 9, 1949
Publication numberUS 2668580 A, US 2668580A, US-A-2668580, US2668580 A, US2668580A
InventorsLuketa Frank J
Original AssigneeLuketa Frank J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 2668580 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

F. J. LUKETA Feb. 9, 1954 CHAIR 2 Shee 12S-Sheet l Filed May 9, 1949 Feb. 9, 1954 F. J. LUKETA 2,668,580

CHAIR Filed May 9. 1949 2 Sheets-Sheet iin FRANK J. LUKETAv INVENTOR.

REYNOLDS 5 BEACH AT ORNEYS Patented Feb. 9, 1954 UNITED STATES PATENT oFFlcE CHAIR Frank J'. Luketa, Seattle, Wash.

Application May 9, 1949, Serial No. 92,153

6 Claims. (Cl. 155-105) The present invention is one of a series dealing with lounge chairs, whereon copending applications are filed in the United States Patent Oice. In substantially al1 such cases a seat and a back are supported from a door-engaging frame, or xed support, for tilting, each independently of the other, Iabout a tilting axis which is located adjacent the rear edge of the seat, and which extends as an unbroken solid or hollow shaft from one side to the other.

The present invention concerns a chair of the same general nature, and particularly concerns a chair wherein simplicity of construction and compactness are promoted, without loss of essential ruggedness, rigidity, or flexibility of operation and adjustment, by the substitution of segmental shafts located adjacent the pivot axis and extending from one side to the other of the respective main body-supporting elements, in lieu of the unbroken solid or hollow shafts heretofore used. The arrangement is such as will still permit the independent tilting of the seat and the back.

` By thus achieving simplicity of construction,

not only is the cost of the chair lessened, but the ease of assembly or disassembly is greatly enhanced, and, moreover, by reason of the omission of parts likely to get out of order, the ruggedness of the chair as a whole is materially improved,

and the manufacture and assembly of its various parts is simplied.

It is a further specific object in such a chair, wherein the seat and the back are independently tiltable about a common axis, in effect to split that axisl between them, so that while still maintaining the ruggedness and rigidity of adequate torque-transmitting cross-connections between the two sides of each of the seat and back, and adequate iiexibility of independent movement for each thereof, there is a minimum of interior parts, and a maximum of mutual support, and which as a result makes possible the substantially direct connection to each of the seat and back of the motor means which accomplishes tilting thereof, thereby materially simplifying the construction and assembly of all parts of the chair.

With these objects in mind, and others as will appear as this specication progresses, the present invention comprises the novel chair, and the novel combination and arrangement of the parts thereof relative to one another, and the novel individual subcombinations, all as are shown in the accompanying drawings in a typical form, and as will be more fully explained and defined hereinafter.

Figure l is in general a plan view of such a chair, with various parts broken away and shown in section, with the seat and back disposed in substantially horizontal position, and with the foot rest projected.

Figure 2 is a side elevational View, with parts broken away to illustrate the simplicity of the tilting means for one of the main body-supporting elements.

Figure 3 is a horizontal axial sectional View, with parts substantially in the positions of Figure l, taken along the tilting axis of the seat and back,` and Figure 4 is a transverse sectional View through the axis, with certain parts omitted for clearer understanding of the parts illustrated.

Figure 5 is an isometric view of one of the complemental segmental shaft elements.

The seat I and the back 2 are supported for tilting about an axis in the vicinity of the rear edge of the seat, from a licor-engaging frame 3. A foot rest 4 may be supported for projection and retraction relative to the forward edge of the seat, and in the construction shown is semi-independent of the seat frame. In addition it is tiltable with respect to the seat I, and although not necessarily so arranged, herein its tilting axis coincides with the axis which is common to the seat and back. A head rest 5 is supported from the back 2, with respect to which it is projectable and retractable.

The frame 3 is made up of two hollow side arms cross-connected by elements 32 and 33, one of which, at least, may constitute a foot. In addition, a rod 30 extends between the hollow side arms, and is secured to each, as indicated at 3| (see Figure 3), whereby it becomes a simple matter for the rod 30 and the elements carried thereby to be dismounted from the supporting frame.

Secured for oscillation about the rod 30, which thereby becomes a pivot support,. is a composite shaft made up of two shaft segments, which are generally alike. One such segment is shown in Figure 5. This may 'be assumed to be the segmental shaft section which supports and rotates the back, and which will therefore be designated generally by the numeral 20, and a companion section I0 supports the seat. Referring particularly, then, to the section 20, this includes an outer end or terminal section 22, an enlarged cylindrical section 23, and a long segmental section 24. The shaft section I0 in similar fashion is formed with a cylindrical end section I2, and a long segmental section I4. Taken together, the segmental portions 24 and I4 do not occupy 360,

but allow relative rotational movement of perhaps 90. This is best seen by reference to Figure 4.

To the shaft section I0 are secured the arms Il, by means such as are indicated at IIa, which arms are secured in turn to the frame of the seat I. yEach such arm, in the portion which embraces the composite shaft, is formed with a cylindrical collar. Hence with respect to the arms II that are secured to the shaft I0, the segmental portionV 24 of the shaft 20 is merely journaled within the bore in the end of the arm II. In similar fashion arms 2I, which are secured to the back 2, are secured at 2Ia to the shaft 20,

vided. 1with amplebearingsat lziothen'ds,` and yet 3 afford thenecessary degree of cross rigidity between the two sides of the seat and of the back, respectively. shaft I0, 20 is bored to receive, and oscillates about the pivotI rod 30, yet each shaft I and 2D' is left with a free cylindrical end I2 or 22, for the direct connection of power means to effect their tilting.

To the latter end double arms I5 are secured to the end portion I2 of the shaft I0, and a jack screw I8, directly rotated by the motor I9 located within one frame arm 3, threads within a nut I1, which is tiltably supported at I'Ia in the outer end of the arms I5. The seat-tilting motor I9 is pivotally mounted at I9a in the floorengaging frame at a point offset from the pivot axisat 30 of the seat and back. In similar fashion arms 25 are secured to the cylindrical end 22 of the shaft 25. A nut 2l pivotally mounted at 21a receives the jack screw 28 driven from the motor 29, pivotally mounted at 29a Within the other frame arm 3. v

Controls for the motors (not shown) are located conveniently to the occupant, so that he may, by pressure upon a button, determine the sense of operation of any motor, and initiate and stop its operation at will. Thus he may tilt up- Wardly or downwardly either the seat I or the back 2, or both thereof, or actuate other controls, later alluded to.

The connection between the motor which effects such movement, and the seat or back which is so moved, is about as direct as can be obtained, and the mechanism is throughout extremely simple and yet effective. It occupies a minimum of space, its bulk and weight are small, and it is readily accessible for servicing.

Conveniently the foot rest is projectable and retractable with respect to the seat, and is supported in effect from the seat, although for retraction and projection it reacts from the frame.

The side marginal portions of the frame of the seat, see Figure 3, define a channel I6. This guide or channel I6 receives a first slide 4I, for projection and retraction, and the latter also is formed as a guide for a second slide 42. The foot Taken together, the composite 4 since these provision are not part ofuthisinvention.

I claim as my invention.

l. A chair comprising a floor-engaging frame,

aseat, a back, two segmental shaft elements dis- V, posed one alongside the other to constitute conjointly a single but interrupted cylindrical shaft, the two parts whereof are mutually relieved angularly tov oscillate relatively through a limited angle about their common axis, the frame constituting a journal support for said composite shaft, the seat and thefends of one such shaft element being rigidly interconnected, and the back and the ends of the other shaft elementbeing similarly rigidly interconnected, and means carried by the respective shaft elements for engagement by tilting means, whereby to tilt 7 for independent tilting about a common axis located adjacent the rear edge of the seat, a sup` port for the seat and the back comprising a cylindrical shaft for journal support in the frame,l located in the tilting axis, and formed as two segmental shaft elements disposed one alongside the other, and having overlapping confronting portions, said overlapping confronting portions being conjointly of an angular extent less than 360, whereby either may koscillate about the common axis independently of the other through a restricted angle, means at the ends of each for securement to the seat and to the back, respectively, and means carried by each shaft element for Atilting engagement by tilting means, independently of the other shaft element.

3. In a chair as in claim 2, four collars embracing both shaft elements, two adjacent each end, one such collar at each end, for securement to the seat, being secured to one such shaft element, and the other shaft element being jour? naled therein, and the other such collars, for

rest 4 is secured to the outer end of the second slide 42.

The mechanism for tilting the foot rest 4 includes a shaft 62, journaled in the seat frame,

and an arm 6l, journaled about the composite shaft I0, 20, but it is unnecessary to describe the securement to the back, being secured to the other shaft element, and the first shaft element being journaled therein. 4. In a chair as in claim 2, wherein the shaf elements are complementally axially bored to constitute a hollow shaft, a pivot` rod received in such bore for securement at its ends to the frame, to constitute a support about which each of the shaft elements, and hence the seat and back, may tilt. 5. A chair as in claim 2, characterized in that, each shaft element, at one terminus, is com# pletely cylindrical, and the respective means for tilting engagement are connected to such termiand for tilting, upon arms 5I, pivotally mounted y at S, and the pivot shaft 50 is movable inwardly and outwardly along the frame of the back v2, in guides 54a. A nut or nuts at opposite sides of the back, indicated at 52, are threaded upon jack screws 53, which are rotated at like speeds in 1 the shaft 50 is received and journaled. The arms f 5I are secured tothe shaft 50. Tilting is accomplished by means of an arm or arms 55, and other mechanism not necessary to describe,

nal ends.

6. A chair as in claim 5, wherein each means for tilting engagement comprises a radial arm on each cylindrical terminal end, and a nut tiltably carried by each such arm, for the reception of a complemental jack screw on the frame.


References cited in 'the sie of this patent UNITED sTATEs PATENTs Number Name Date 287,769 Miller Oct. 30, 1'883 369,558 Scarritt Sept. 6, 1887 1,182,125 Whitehead May 9, 1916 1,231,015 Grant June 26, 1917 2,133,471 Opperman Oct. 18, 1938 2,349,701 Buttinkofer May 23,1944

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US287769 *Oct 30, 1883F Twodavid w
US369558 *Jan 14, 1887Sep 6, 1887 Reclining-chair
US1182125 *Nov 25, 1914May 9, 1916William J WhiteheadChair.
US1231015 *Aug 4, 1916Jun 26, 1917Pyle National CoRock-shaft.
US2133471 *Jun 30, 1936Oct 18, 1938Dougias Aircraft Company IncAdjustable chair
US2349701 *Jun 26, 1941May 23, 1944Buttikofer John WHospital bed
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2944595 *May 21, 1957Jul 12, 1960Castro Convertible CorpPower operated reclining chair
US3623767 *Aug 22, 1969Nov 30, 1971Invalift IncInvalid lifting seat
US5163734 *Oct 7, 1988Nov 17, 1992William HakanssonDevice for adjusting objects around a vehicle driver
US5370443 *Mar 10, 1994Dec 6, 1994Ikeda Bussan Company, Ltd.Seat device
U.S. Classification297/330, 297/362.11
International ClassificationA47C1/031, A47C1/037
Cooperative ClassificationA47C1/037
European ClassificationA47C1/037