US430314A - John gilson - Google Patents

Description

(No Model.)

J. GILSON.

REVOLVING AND TILTING CHAIR.

Patented June 17, 1890.

niiiii UNITED STAT S" PATENT OFFICE.

JOHN GILSON, OF PORT VASHINGTON, WVISOONSIN.

REVOLVING AND TlLTlNG CHAIR.

SPECIFICATION forming part-of Letters Patent No. 430,314, dated June 17, 1890.

' Application filed November 27, 1889. Serial No. 331,775. (No model.)

To all whom it may concern:

Be it known that I, JOHN GILSON, of Port Washington, in the county of Ozaukee and State of Wisconsin, have invented new and useful Improvements in Revolving and Tilting Chairs; and I do hereby declare the following to be a full, clear, and exact description of said invention, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Figure 1 is an elevation of my improved device, shown in connection with so much of the seat and legs of a chair as is necessary to show its relation thereto. Fig. 2 shows a small part of the top of the spindle and supporting device in connection with the thereon-supported tilting device, some parts being in vertical section. Fig. 3 is a view of the same parts shown in Fig. 2, taken at right angles thereto, some parts being in vertical section.

Fig. 4 is an under side view of the legs and head on which my device is supported. Fig. 5 is a vertical central section of the device for raising and lowering the chair-seat, and on which it revolves, parts being in a modified form. Fig. 6 is a modified form of the tilting device.

An iron head-block A is provided with sockets in its lateral edges, in which are inserted the legs B B, whereon my device and the chair above it are supported. The head-blockA is of considerable vertical height, and is provided with a vertical central aperture, through which passes movably the spindle C, which has a bearing of considerable length, and though movable therein is fitted thereto with sufficient closeness to be retained and held against tilting and is guided in its rotary and endwise movements thereby. An arm D, preferably in the form of a yoke, as shown in Fig. 1, has its extremities in ways, preferably dovetailed grooves E E, therefor in the lateral edges of the head-block A, and is adapted to move and to be adjusted endwise therein. A pin F passes movably through the arm D, and is adapted to enter in one of a series of vertical sockets G G therefor in the headblook A at the bottom of one of the grooves E.

For conveniently withdrawing the pin F from a socket G, it is attached to a lever H,

pivoted on the arm D, and provided with a spring H, adapted to hold the pin up to its work. The arInD supports the chair thereon and is adapted to be raised or lowered in the head-block A, whereby the height of the chair can be adjusted, and the arm is secured in position on the head-block by the pin F, which passes through the arm and, enters a socket G, thereby locking the arm in position with relation to the head-block.

In the modified form shown in Fig. 5 the supporting-arm U has but one leg, the other being omitted, and instead of a pin F a setscrew'F is used to lock the arm in position to the head-block. A chair-iron I, of irregular cup shape, is secured rigidly to the top of the spindle O, the spindle being inserted in an aperture therefor in the bottom of the cup and riveted therein for that purpose. This cup I rests and is revoluble on the arm D, through which the spindle 0 passes in an aperture therefor and in which it is rotatable. A spider K, on which the chair-seat L is fixed, rests and tilts on the chair-iron I. For the purpose of forming this tilting connection between the chair-iron I and spider K, the side walls of the chair-iron are provided centrally with upwardly-extending projections M, which form a fulcrum on which corresponding parts of the spider K rest, and whereon the spider and chair-seat are tilted.

The chair-iron I is provided with notches N N immediately in front of the projections M M, into which extend projections N N, integral with the spider, whereby the spider is held in position against front or rear movement on the chair-iron. Bearing-surfaces O O are also provided on the top near the front and rear of the chair-iron I, and corresponding bearing-surfaces O O are formed on the spider K, which are adapted to engage the bearing-surfaces O 0, whereby the tilting movement of the chair is limited and controlled. Two lugsP P, integralwith the spider, extend downwardly therefrom into the chairiron I, near its side walls, and a rod R, passing through the lower ends of the lugs P P, projects beyond those lugs into apertures S S therefor in the side walls of theiron I. These apertures are so formed and located with reference to the lugs P P and rod R that as the spider and chair-seat tilt to the extent provided for by the connection between the spider and the chair-iron the ends of the rod R move in an are close to the upper walls of the apertures S, and when the chair-seat is in its level position, as shown in Fig. 1, the rod R bears against shoulders projecting downwardly from the upper walls of the apertures, adapted to receive the rod thereagainst, and when the chair is tilted backwardly to the extent permitted by the con struction of the spider and chair-iron the rod R engages shoulders projecting downwardly from the top' walls of the apertures S S, near their front ends, whereby the further rearward tipping of the chair-seat is prevented. This rod R, passing through the lugs P P and extending through the apertures S S slightly beyond the walls of the chair-iron I, serves not only to limitthe tilting movement of the spider and chair-seat, but also holds the chair-seat in position on the chair-iron I.

To hold the chair-seat yieldingly against tilting backward, a wire spring '1 is located just at the rear of the lower ends of the lugs P P, and its inner end rests against the iron I, while its outer end bears against a screwthreaded head U, turning on a stem V, the inner end of which stem V is secured to a yoke W centrally, the yoke being provided withsmall apertures near its two ends, through which the rod R passes movably. The yoke WV is of such length as to fit nicely between the lugs P P, so that the yoke cannot move endwise between the lugs, and the stem V is thereby held constantly in a central position between the lugs, and the force of the resistance of the spring T on the stem Vis exerted truly and centrally between the lugs P P at right angles to the rod R.

In Fig. 6 a modified form of chair-iron and spider is shown, in which the upwardly-extending projections M M extend forwardly horizontally at their extreme ends into lateral recesses therefor in the corresponding projections on the spider.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. In a revolving chair, a head-block supported fixedly on the legs of the chair, in combination with a chair-iron on which the spider afiixed to a chair-seat is fulcrumed, which chair-iron is provided with a rigid cylindrical spindle that passes through the headblock and has rotary and vertical movement therein with such considerable length of bearing in the head-block as to hold the chairiron against tilting, and an arm fitted to and adjustable vertically in ways in the headblock, which arm extends upwardly and is turned over above the head-block and carries the chair-iron by a bearing on the top surface, the spindle of the chair-iron passing through the arm and having normally rotary movement only therein, a series of sockets G G in the head-block A, arranged vertically in the bottom of a groove E, and a pin, as F, passing movably through the vertically-moving arm, whereby the chair-seat may be adj usted and supported vertically, substantially as described.

2. The combination, with the chair-iron I, provided with slots S S and a thereon-supported and tilting spider K, provided with lugs P P extending downwardly at a distance apart into the iron I, of a yoke W, located between thelugs P P and secured therein by a rod R passing through the lugs and through the ends of the yoke, on which rod the yoke is permitted to oscillate, a stem V, fixed at one end in the yoke centrally, and a compression-spring T, coiled around the stem V and bearing against the chair-iron at one end and against a head on the stem V at the other end, the ends of the rod B being free to move in the slots S S, substantially as described.

3. In a revolving chair, the combination, with a chair-iron I and upwardly and horizontally projecting parts M M thereof, of a spider K, fulcrumed on the projections'M M and having lateral recesses within which the horizontally-extending projections M M enter, substantially as described.

4. In a revolving chair, the combination, with a chair-iron I, of a spider K, fulcrumed on the top surface of the chair-iron, lugs P P, integral with and extending'downwardly from the spider, and rod B, passing through the lugs and extending into apertures S S therefor in the walls of the chair-iron, whereby the connection between the chair-iron and spider is made secure and the tilting movement of the spider is limited, substantially as described.

5. In a revolving and tilting chair, a chairiron I, having a head formed with opposite side walls, the tops of which walls have each a centrally upwardly-extending projection, a recess in the rear of the projection, and bearings, as O O, in front and at the rear of the projection, and the recess, in combination with a spider supporting the chair-seat, which spider is fulcrumed on the chair-iron head and is formed with a part having side walls registering with the side walls of the chairiron head, which walls have each a downwardly-extending projection adapted to enter the recess in the side wall of the chair-iron head, and bearin gs O 0', corresponding to the bearings O O, substantially as described.

In testimony whereof I aifix my signature in presence of two witnesses.

JOHN GILSON.

WVitnesses:

W. .I. DIEDERICH, H. L. Con.

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