US374971A - Joseph w - Google Patents

Description

Pateted-Deo. 20, 1887.

(No Model.)

2 Sheets-Sheet 2 J. W. KENNA.

TIL-'FING CHAIR. Nor 3741971- Patented Dee. 20, 1887.

l4 @D Jv j( d I] f/ N4 PETERS. Hmamholmpmn washington. D; C.

UNITED STATES PATENT OFFICEo JOSEPH IV. KENNA, OF CHICAGO, ILLINOIS, ASSIGNOR TO JAMES IV. VAIL, TRUSTEE, OF PORT WASHINGTON, VVISOONSIN.

TILTING-CHAIR.

SPECIFICATION forming part of Letters Patent No. 374,971, dated December 20, 1867.

Application filed May 24, i886. Serial No. 203,087. (No model.)

To all whom, it may concern:

Be it known that I, JOSEPH IV. KENNA, a citizen of the United States, residing` at Chicago, county'of Cook, State of Illinois, have invented certain new and useful Improvements in TiltingOhairs, of which I do declare the following to be a full, clear, and exact descrip tion, reference being had to the accompanying drawings, forming part of this specitlcation.

1o My invention relates to tilting-chairs of that class wherein the chairseat is separate from the tripod-like base, being mounted upon the arms of the spider-frame pivotally joined to an upright standard or support. The lower I5 portion of the standard `constitutes a spindle, which is ordinarily screwthreaded, to engage with eountenthreads in the perforated basenut, said nut having the legs of the chair se cured thereto. The ehairseat, spiderframe,

2o and spindle turn together about the tripodbase, and are adjustable as to height, usually by the screw action of the spindle with the base-nut. A coil-spring secu red between the standard and the spider-frame controls the tilting movement of the chair-seat and frame about the standard-pivot, and by adjustment in tension enables the chair to be adapted to the comfort of the occupant.

Theinvention is designed to produce a cheap,

3o simple, and eiiieient chair of the kind mentioned; and to that end it consists in certain im provements in the structure and organization ofthe parts located between the chair seat and base, such parts, in combination, being known to the trade as the irons The nature of said improvements will fully appear from the following description, and be distinctly pointed out in the claims at the couelusion thereof.

4o Figure l is a view in side elevation; Fig. 2, a view in longitudinal vertical section, and Fig. 3 a view in longitudinal horizontal section. Fig. 4 is a view in front elevation of one form of my invention employing double springs. Figs. 5, G, 7, and S are views similar to Figs. l, 2, 3, and 4, respectively, showing the organization of the parts when a single spring is employed.

The base-nut A is of the usual construction,

5o being provided with the recesses or seats to receive the ends of the legs of the chair, which extend thence, as well understood, in tripodlike fashion to furnish the basesupports. The threaded spindle B screws into the nut A in Vthe usual manner, and carries at its upper end f is secured thereto.

Cast in one piece with the spider-frame and the ears d depending therefrom is an expanded head or plate, f, located between the ears and furnished with screw-likelngs g, which afford bearings or seats for the ends of the coil` springs l). The standard O extends upward in direction vsubstantially parallel to the expanded face f of the spider-frame, and eon- 7o tacts therewith, nearits upper end, when the chairseat is in horizontal position, to limitthe movement thereof about-the pivot c. Vhen the chair is tilted backward, the rib fr on the spider-frame glides into the seat s ou the standard C, and thus checks the movement of the chair about the pivot c at the same time that the frame and scat are held from sidewise play. The retention-rod G carries thereon a screw-likebearingplate, y', against which the 8O end of the coiled springs D may abut, said springs being thus securely seated between the bearings g g', located upon the spider-frame, and the retention rod, respectively. The spidereframe and the standard are perforated or 8 5 otherwise cnt away, to permit the free passage of the retention-rod G, which, atits end oppo-` site to the bearing-plate g', is screw-threaded to receive the handwheel H or like adjusting device. The pivot-plate h, slidingfreely upon 9o said rod and bearing against seats upon the standard C, serves to sustain said rod in position against the tension of the spring D and to permit the radial shift of the rod without disarrangement of the parts or undue strain during the tilting movement of the spiderframe about the pivot c.

The adjusting-wheel H turns freely at its end within a socket ofthe pivot-plate h, so that with such plate as a bearing the wheel H may 10o be rotated, and the rod G be in consequence drawn back or forth to vary the tension of the springs D. If desired, the position ol" the hand-wheel H upon the rod G may be reversed-that is, said Wheel may rest against the bearing-plate g', instead of against the pivot-plate h, as shown, in which event the rod G would be also reversed end for end, so as to receive the wheel in the new relation and retain the pivotplate h.

In order that the spindle B and its standard may not be jammed tight down against the base-nnt A, which sometimes wrenches the standard from t-he spindle, there is provided a lug, 7c, projecting from the standard, and as the downward rotation of the spindle proceeds engaging with the shoulder or terminal of a vanishing recess or seat (shown at l, dotted lines, Fig. 8) in the top plate, K, of the basenut. The stop k arrests the rotation of the spindle B before the standard can jam against the base-nut A, and in consequence saves such parts from strain and danger of breakage. Manifestly the like result would be attained by making a lug on the eapplate K of the basenut of suflicient height to Contact with some projecting portion of the standard.

By pivoting the spiderframe to the standard C at the point c, near to the base, a firm, strong joint is secured at the same time that the leverage of the chair-seat in tilting is greatest. In consequence the movement against the tension ofthe spring D is even and.

comfortable, the retention rod G shifting about, together with its radial pivot-plate 7L, so as to avoid undue strain at the same time that a substantially direct thrust upon the coilsprings D is maintained during the tilting movement. The spider-frame may be pivoted to the standard at some other point above the pivot c, although such position is deemed the most desirable in practice.

rl`he general combination, in a tilting-chair iron, with the standard thereof, the spider pivoted thereto, a coil-spring, and an adjusting-rod and hand-wheel, of a pivoted plate bearing against the standard and sustaining the adjusting-rod, is not claimed herein, the same being the subject of a separate application led by me September 22, 1884, Serial No. 143,638.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination,with the upright standard, of the spider-frame mounted thereon and tilting about the same, and provided with a dependent face-plate to rest against the standard, the retention-rod pivotally sustained at one end upon said standard, extending freely through said standard and faee-plate,and carrying at its opposite end an expanded bearing-plate,a compression-spring seated between and against said bearing and face plates, respectively, and a hand-wheel threaded to the retention-rod to vary the tension ot' said spring, substantially as described.

2. The combination, with the upright standard, of the spider-frame mounted thereon and tilting about the same, and provided with a dependent face-plate to rest against the standard,the retention-rod extending freely through said standard and face-plate, and carrying near one end a stayplate set pivotally against said standard, and at its opposite end an expanded bearing-plate, a compression-spring seated between and against said bearing and face plates, respectively, and a hand-wheel threaded to the retention-rod and resting against the stayplate thereof, substantially as described.

3. The combination, with the revolving chair-spindle, and with the base-socket to receive and support the same, of the stop or lng interposed between said spindle and socket to arrest the rotation ofthe spindle, substantially as described.

JOSEPH EV. KENNA.

Witnesses:

JAMEs H. Pinnen.

CARTER HENRY HARRIsoN, J r.

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