Adjustable chair or table.

Application filed February 28, 1902. Serial No. 96,062. (No model.) normally projected to prevent the stem turning in the passage. The upper side of the sphere is provided with intersecting grooves 13, extending, preferably, at right angles to 55 each other, and at their intersection-point said grooves register with cavity or socket 14, similar cavities or sockets being formed at the opposite ends of the grooves and at intermediate points. The sphere is also pro- 60 vided with a circular groove 15, which intersects the outer ends of the cross-grooves and is provided with cavities or sockets 16 at suitable points, similar to cavities or sockets 14.

The socket, which engages said ball and con- 65 stitutes in conjunction therewith a ball-andsocket joint, consists of two similar halves 17, provided with lugs 18, connected together by bolts 19, and said socket is provided centrally with a passage 20, wherein a pin 21 is slid- 70 ingly mounted, said pin fitting at its lower end in one of the grooves of the ball and having a diametrically reduced prolongation 22 to engage a cavity or socket, and thus lock the ball-and-socket-joint members rigidly to- 75 gether.

designates a seat or body portion, the same being upholstered and formed at its under side with a chamber 24, into which the pin 21 projects through a hole in the bottom, 80 said pin being held depressed normally by a spring 25, secured to the bottom, as shown, or in any equivalent manner. The pin is elevated when desired, so as to withdraw the prolongation 22 from the engaged cavity or 85 socket, by means of a shaft 26, journaled in chamber 24 and provided at one end with a crank-arm 27, pivotally engaging the upperend of the pin, and at its opposite end with a lever 28, the latter projecting through the 90 bottom of the seat or body portion in order that the operator may conveniently grasp and manipulate it, and to prevent the pin being accidentally elevated sufficiently high to withdraw it from the ball-groove with which it 95 • is engaged at the time the socket-passage 20 is provided with an enlargement 29, engaged by a rigid collar or enlargement 30 of said pin.

indicates a foot-rest hinged to the front ieo i portion of the seat and adapted to be elevated I to the position shown by the dotted lines in

To all whom it may concern:

Beit known that I, PhilipC. Palmer, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of 5 Missouri, have invented certain new and useful Improvements in Adjustable Chairs or Tables, of which the following is a specification. .

My invention relates to adjustable chairs io or tables, and more particularly to that classification in which fall physicians’ operating chairs and tables and invalid, dentist, barber, and railway-car chairs, and, in fact, revolving and reclining chairs of all types; and my 15 object is to produce a device of this character giving universal adjustment to the seat or body portion and independent or simultaneous vertical adjustment to the back and footrest·.

With these general objects in view the invention consists in certain novel and peculiar features of construction and combinations of parts, as hereinafter described and claimed, and in order that the invention may 25 be fully understood reference is to be had to the accompanying drawings, in which—

Figure 1 is a central vertical section of a chair embodying my invention. Fig. 2 is a detail plan view of a sphere forming part of 30 my invention. Fig. 3 is a detail perspective view of said sphere and the socket which operates thereon.

designates the base, which may be of any suitable or preferred type, .and 2 a central 35 stand or pedestal thereon, provided centrally. with a vertical threaded passage 3 and a registering horizontal passage 4, the last-named passage being enlarged, as at 5. A headed locking-pin (i extends through said passage 40 4 and through screw-plug 7, closing the outer end of the passage enlargement δ, and mounted on said pin is a collar 8 and a spiral spring 9 within said enlargement, the spring bearing at its opposite ends against the collar and 45 plug, so as to hold the pin normally projected into passage 3.

designates a sphere, preferably metallic, and said sphere is provided with a vertical depending threaded stem 11, engaging thread50 ed passage 3, said stem being provided with a longitudinal groove 12, into which pin 6 is

730,690

Fig. 1, or it may be adjusted to any intermediate point between the positions shown by full and dotted lines in said figure.

indicates a back hinged to the rear end 5 of the seat and provided with a latch 33, adapted to engage any of the notches in a quadrant-shaped sector 34 on the back of the seat for the purpose of adjustably holding the back at any point between the positions io shown by the full and dotted lines in Fig. 1.

indicates arm-rests pivotally secured at their opposite ends to the back and standards 35, which latter are pivotally secured to the sides of the seat to permit the adjustment 15 of the back.

To turn the chair in any direction desired, lever 28 is manipulated to withdraw the pin prolongation 22 from the cavity or socket. The chair is then manipulated to slide the 2o pin in the proper direction through one of the grooves 13, in which it may again be secured by the engagement of the pin prolongation with one of the cavities or sockets registering with said groove, and the chair when the 25 pin registers with the circular groove maybe rotated, so as to cause the pin to slide in the said groove and engage one of the cavities or sockets therein.

It will thus be seen that the chair or the ?o body portion may be secured at any desired angle, and it is obvious that additional cavities or sockets and registering grooves will permit of a finer degree of adjustment. Without regard to the angle of the seat or 35 body portion with relation to the ball 10 they both may be revolved and at the same time raised or lowered by the operation of the threaded stem 11 in passage 3, the pin G of course being withdrawn from groove 12 of 40 the stem to enable the latter to turn.

From the above description it will be apparent that I have produced an adjustable chair or table of simple, strong, durable, and cheap construction which is easily operated 45 and embodies the features of advantage enumerated as desirable in the statement of invention, and while I have illustrated and described the preferred embodiment of the same'it is to be understood that it is suscepti50 ble of modification in various particulars without departing from the principle and scope or sacrificing any of the advantages of the appended claims.