US313636A - Surgical chair - Google Patents

Description

(No Model.) G WEBER o SURGICAL GHAIR. No. 31.3,6/36. Patented Mar. 10f 1885 WITNESSES {"J' lIBHVTENIOR www fmw@ 1 l B Y Ummm* ATTORNEYS.

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UNrrEn GEORGE VEBER, OF BROOKLYN, NEV YORK.

SURGICAL CHAIR.

SPECIFICATION forming part of Letters Patent No. 313,636, dated March 10, 1885.

` Application filed February 29, 1884. (No model.)

To all whom it may concern,.-

Be it known that I, GEORGE WEBER, of Brooklyn, Kings county, New York, have invented a new and Improved Surgical Chair, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved surgical chair, which can be readily adjusted in height and locked in position, and the leg and back rests of which chair can also be easily adjusted and locked in place.

llhe invention consists in the combination, with a chair seat and base, of crossed pivoted legs, a segmental rack held on the pivot of the legs, and of a pawl pivoted to the seat and resting on the rack.

The invention also consists in a clip hung by a pivot or wedge passing into a longitudinal slot in the seat side bar, which clip is'provided at its lower end with a catch adapted to engage with a rack on the bottom edge of the seat side bar. The lower end of the clip is pivoted to a bracebar pivoted to a leg-rest, back-rest, or armrest for holding` the said rest in place.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the iigures.

Figure l is a side view of my improved surgical chair. Fig. 2 is an enlarged side view of parts of the sanne, other parts being shown in section. Fig. 3 is. an enlarged detail side view of the locking device, the face-plate being removed. Fig. 4 is a cross-sectional view ofthe same on the line x a0, Fig. 3. Fig. 5 is a crosssectional View on the line y y, Fig. 2. Fig. 6 is a side view of a modification of the mechanism for raising the chair and locking it in place.

At each side of the chair the seat A is sup ported by two crossed legs, B, pivoted to each at their intersection by a pivot, a, or crossrod, the said legs being pivoted to the seatfra-me A and to the base-frame O. The inner ends of thelegs-that is, the upper end of one leg and the lower end of the other-are provided with pins b, which project into'the 1on- 5o gitudinal slots o in the end of frame A and base C.

On each end of the cross-rod a is secured a disk, D, on the inner surface ot' which aourved rack, E, is formed, on the edge of which a pin, F', rests, which is secured in the free end ot' a pawl-lever, F, pivoted to the front ofthe corresponding side of the seat-frame.

Abovepart oftheratchet-plateEasegmental track-piece, G, is arranged such a distance from the edge of the rack that the pin F can pass between the track-piece and the edge of the `track-plate. The track-piece is provided at one end with a tapering pivoted switchtongue, H, the free end of which rests on the edge of the raclrplate E. Alever, J, is pivoted on the cross-rod a, and a short distance from t-he pivot it is provided with a downwardly-projecting arm, J', pivoted to the upper end of a bar or rod, K, pivoted to the basefraine G. lf desired, the lever J can be se- 7o cured on the disk D, and the disk D pivoted at its rim to the bar or rod K, as shown in Fig. 6. The hinged back-rest L is provided at each end with au arm-rest formed of the bars M, pivoted to the back-rest side bars and to the upper ends of bars N, pivoted to the seat-fraine side bars. Each seat-frame I side bar is provided with a longitudinal slot,

O, under which a rack, o, is formed in the bottoni edge of the seat-fra1ne side bar. A

clip-plate, P, is provided with a wedge-piece,

p, at its upper end, which wedgeepiece en tends into the slot O. .and on the lower end of' the clip-plate a catch, Q, is formed, which is adapted to engage with the teeth of the rack o. A connecting piece or brace, R, has its upper end pivoted to the bar-N and its lower end to the lower end of the clip P. The legrest S ispivoted to the end of the seatfra1ne,

and is provided at its lower end with :a pivoted foot-rest. Each side bar of the leg-rest is con` nected by a pivoted bar, T, with a clip-plate,

P, arranged and constructed in the manner described.

rEhe chair is adjusted in the following manner: If the seat is to be raised, the outer end oi' the lever J is depressed, thereby moving the cross-rod a lupward and toward the front to the position shown in Fig. l. The tend- IOO ency of the legs B will be to collapse and cause the seat to loe depressed unless a locking meansis employed.

The pin F onthe end of the pawl-lever F slides over the Vedge of the l the clip and prevent it from assuming asufratchet-plate E as the seat is being raised, and necessarily catches on the several teeth of the same, and if the lever J is released the seat is locked in place.

To lock the seat in its highest position the pin F is caused to engage the right-hand notch, as shown in Figs. 1, 3, and 6. If the seat were now lowered, the rod a would-be moved farther downward and backward from the pin F, and it could be made to engage with any one of the several notches on ratchetplate E. Of course when the lever J is depressed in the act of raising the seat the rear parts of -legs B slide forward, thus bringing the rod a upward and toward the Afront, as above described. The seat can thus be locked at any desired elevation. If the seat is to be lowered, the lever J is depressed until the pin F arrives at the end of the ratchet-teeth,when the seat will be raised as high'as possible. The pin F raises the switch-tongue H and Apasses to the upper surface of the same, and,

if the lever J is released,slides over the trackplate G in the inverse direction of the arrow a', the leverJswinging upward and the crossrod a and the seat moving downward. Ifthe seat is raised as high as possible, the pin F slips from under the tongue H and raises it, and then slides back over the curved trackplate G, whereby the chair will be lowered. lf

. the chair is to be lowered when partly raised,

the pawl-lever F is raised to disengage the pin F from the teeth of the rack-pl ate E, thus permitting the seat to descend. Ifthe back-rest is moved forward, the locking device moves with it and locks the back-rest automatically as soon as it is released, so that for adjusting the back-rest in a more vertical position all that is necessaay is to move the back-rest for- ;ward; but if the back-rest is to be moved back.

the bar R must be moved in the direction of the arrow b', Fig. 2, to disengage the catch Q from the rack o. As soon as the bar R is released it swings back and locks the backrest in place. The back-rest can be held at any desired inclination. Theleg-rest S can be adjusted in asimilar manner. lf the chair is not in use, the leg-rest S can be folded over the sea-t and the back-rest over the leg-rest, as shown in dotted lines in Fig. l.V lf the legrestis folded inthemanner described, its locking device, which is the same as the locking device for the back-rest, is iirst moved in the direction of the arrow b', andis then moved in the inverse direction of the arrow b; but when moved in theyinverse direction of the arrow b the clip-piece P must be held in suc-l1 a direction that its catch cannot engage with the rack o. This is accomplished by means of a pin, tt, projecting from the face of the pivoted bar T in front ofthe lower end of clip-piece P, so that when the leg-rest and bar T are being brought to the positionshown by dotted lines in Fig. 2 the said pin will form a bearing for ciently vertical position to bring its catch into engagement with the teeth 0. In the return movement of the clip, leg-rest, and bar Tthe pin does not act at all.

Having thus described my in vention, I claim as new and desire to secure by Letters Patentl. In a chair, the combination, with a seat and a base, of crossed pivoted legs, a segmental rack held on the pivots of the legs a pawl pivoted on the seat, and a lever connected with the pivot or cross-rod of thelegs for raising the same,"and a fulcrumconnection between said lever and base, substantially as herein shown and described.

2. In a chair, the combination, with a seat and base, of crossed pivoted legs, a segmental rack held on the pivot of the legs, a curved track-bar held above the rack, a switch or tongue pivoted at the end of the track-bar, and

a pawl pivotedto the seat, a lever secured to pivot-rod ct, and a fulcrum-connection between said lever and the base, substaptially as herein shown and described.

3. In a chair, the combinatiomwith the base C and seat A, of the crossed pivoted legs B, the disk D on the pivot ofthe legs, the ratchet-disk E on the disk D, thelever J, having an arm, J', the connecting-rod K. pivoted to the arm J, and the base C,'substautially as herein shown and described.

4. ln achair, thecombination, with the seat Y side bar, A, having a longitudinal slot, O, and a rack, o, in the bottom edge, of the clip P, having the catch Q on the lower end ofthe same, and the wedge p in the upper end of the same projecting into the slot O, and ol'a bracebar pivoted to the lower end of the clip P, substantially as herein shown and described.

5. In a chair, the combination, with a seat side bar having a longitudinal slot,and below it a rack on the bottom edgegpf the bar, of a clip-plate provided at its uppei1 end with a projection extending into the slot in the seat side bar, and a catch on its lower end, which catch is adapted to engage with the rack, and of a brace-bar pivoted to the lower end of the clip and connected with a back-rest or equivalent moving part, substantially as herein shown and described.

6. ln a chair, the combination, with a seat side bar, A, having a longitudinal slot, O, and rack o, of the leg-rest S, pivoted to the side bars, clip P, )rovided ou its upper end with a'projection extending into the slot O, and a catch on its lower end engagingthe rack o, the brace-bar T, pivoted to the leg-rest and to the lower end of the clip, and a pin, t, on said brace-bar in front of the lowerpart ofthe clip, substantially as and for the purpose set forth.

GEORGE WEBER.

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