US588525A - Frank bell - Google Patents

Description

(No Model.)

F. BELLQ oPERAToRS SEAT.

Patented Aug. 17,1897.

` tical section on line 3 3 of Fig. 2.

FRANK BELL, OF TUNBRIDGE VELLS, ENGLAND.

OPERATORS SEAT.

ESPECIFICATIGN forming part of Letters Patent No. 588,525, dated August 17, 1897.

Application nea June 12, 1897.

To all whom it may concern:

Be it known that I, FRANK BELL, a subject of the Queen of England, residing at Tunbridge Wells, in England, have invented certain new and useful Improvements in Operators Seats, of which the following is a speciiication. f

This invention relates to an adjustable seat for the use of dental surgeons and others.

In the annexed drawings, Figure lis an elevation of the seat. Fig. 2 is a horizontal section on the line 2 2 of Fig. l. Fig. 3 is aver- Fig. et is a view of one of the parts carrying the seatpivot. Fig. 5 is a view of said seat-pivot.

A is apillar having a base-plate A' and suitable webs A2 A2 A3, of which the former two -are more extended than t-he last.

A4 is a iiange on the pillar A about midway of its height, the upper face of this iiange having recesses in the form of ratchet or othervv teeth a. Above the 'flange A4 the diameter of the pillar A is reduced to form a spindle for a sleeve B, from one side of which there extends a curved or straight frame B", carrying at its outer end a vertical socket B2. Through lugs b on the sleevefB there passes a rod C, the lower end of which is adapted to engagethe recesses a, while the upper end is slotted to be engaged by the arm C of the lever C2, pivoted on the sleeve B. A spring C3 tends to press the rod C downward into engagement with the recesses a, but such rod may be lifted out of-engagement with the recesses by movement of the lever O2 by hand, thus leaving the socket B free to be revolved on the pillar A., .The sleeve B is retained on the pillar A by the washer D and flange of the screw D', screwed into the upper end of the tubular pillar A.

There passes through the socket B2 the vertical limb of an L-shaped rod E. B3 is a setscrew having its outer end formed as a lever for turning it by hand to bear on the rod E after the latter has been adjusted vertically and rotarily;

F F represent a pair of blocks, of which each carries in the center a passage F, Fig. 4, (one of which is screw-threaded,) and below the latter a transverse recess F2 and above SerialNo. 640,536. (No model.)

the passage F a vertical recess F3 with a groove F4. When such blocks FF are se- 4cured together by the screw G traversing the passages F', the recesses F2 form a socket for the horizontal arm of the rod E and the recesses F2 form a socket for holding the pivot AH of the seat J. The pivotI-I has a ring H to engage the groove F4 in the recesses F2. The blocks F thus, together with the screw G, form a clamp, which after adjustment of the same upon the rod E and of the pivot H in the clamp may be tightenedy by the screw Gto firmly embrace the rod E and the pivot H and hold both with the requisite friction.

Having now described my invention, I claiml. A seat-supporting frame comprising in combination a vertical stationary pillar, a socket rotarily movable thereon, a frame extended laterally from said socket, a vertical socket in the outer end of said frame, a rod having a horizontal arm and a vertical arm the former engaging in said last-mentioned socket, a seat, a vertical pivot thereunder,

and a clamp adapted to engage said pivot and also the horizontal arm of the rod aforesaid, the whole substantially as setforth.

2. A seat-supporting frame comprising in Vcombination a vertical pillar, a base-plate thereto, a flange on said pillar having recesses in its upper face, a sleeve rotarily mounted on the upper part of said pillar above said flange,

a pawl on said sleeve adapted to engage the recesses in said flange, a hand-lever for disengaging said pawl, a frame extending later- -allyfrom said sleeve, a vertical socket in the

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