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Publication numberUSRE10906 E
Publication typeGrant
Publication dateMar 6, 1888
Publication numberUS RE10906 E, US RE10906E, US-E-RE10906, USRE10906 E, USRE10906E
InventorsFrank K Case
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Surgical chair
US RE10906 E
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

' P. E. GAS.'


Nq. 10,906. Reissued M3126,` 1888.

3 Sheets-Sheet 2.


No. 10,908. Reissued Mar. 8, 1888.

3 Sheets- Sheet 3.



No. 10,906. Reissued Mar. 6, 1888. v

G 1f l Y L a, f '1' 3 nl C f Ilo o Ol z3 0 wo l o" U I 7Y` a' TIl ,R Y C O| o C 2,73 '1 a I Ii Z n #rma adfa.

. reclining, or lying position, to raise and lower clearly in Figs. 2a`nd 4. Asshown in saidig- UNITED STATES PATENT OFFICE.

FRANK noAsn, or CANTON, oH'io. I


SPECIFICATION forming part of ReissuedLetters Patent No. 10,906. dated March 6, 1888. AOriginal No. 360,279, dated March 2U, H587. Application for missile llled October 18, 1887. Serial No. 252.762.

To all whom it amy concern.'

Be it known that l, FRANK E. CASE, a citizen of the United States, residing at Canton, in the county ol' Stark and State of Ohio, have invented certain new and useful Improvements in Surgical Chairs, of which the follow ing isaspecifeation, reference being had therein to the accompanying drawings.

My invention relates to surgical chairs; and it consists in various novel features of construction by which the chair is rendered eapable of adjustment in a variety of ways, as hereinafter fully pointed out.

In the accompanying drawings, Figure 1 is a perspective view ofv my improved chairinits normal adjustment; Fig. 2, a side view showing the back, the head-rest, and the foot-rest thrown into the same horizontal plane; Fig. 3, a vertical sectional view in which the back is shown in a horizontal position and the footrest dropped down to its normal position; Fig. 4, a perspective view showing the main supporting parts separated and raised one above another to illustrate their relative positions and the manncr/ ol' assembling them; Figs. 5 and 6, perspective views of certain details; Fig. 7, a view illustrating a slight modification.

As is well known, surgical chairs are rcquired to be adjusted to a great variety of positions, so as to bring the patient to a sitting,

the head or the l'eet simultaneously or independently, to tip or turn the patient to either side, and, generally, to secure any position necessary for convenient treatment or manipulation by the surgeon. These objects l attain in an elicient manner and with ease and expedition by the construction shown in the annexed drawings. l

In said drawings, Aindioates a base or frame, which is preferably made with four feet, well spread apart to give stability and freedom from liability to overturn. The l'eet are ad visably furnished with casters for convenience in moving the chair about.

As best shown in Figs. 1 and 2, the base or frame A is formed with two upright side arms or standards, a a, between and to which is hung a yoke, B, the l'orm of which is shown ures, the yoke or swinging frame B has two upright arms, b b, which when the yoke is in position fit close to the inner faces ol' the standards or upright arms a a of the base, to which they are attached by pivot bolts or pins c c, Figs. 1 and 2. 1

From the horizontal cross-bar d, which connects the arms b b of the yoke, a central tubular neck, e, rises to about the height ol' said arms, as shown in Fig. 4, and beneath said bar, and in line with the neck e, a depending extension, f, is formed, the lower end ol'which is divided into three parts or branches,A y, li, and separated one from another a short distance. The outer branches, g and fi, are notched or beveled to form teeth j, those of one branch facing in a direction opposite to those of the other branch, as shown in Fig. 4. These teeth are designed to engage with two bars or racks, k k, having similarlyreversed teeth, which racks are formed upon a locking-frame, C, pivoted in base A and having a limited vertical movement therein. The locking-frame C is normally held up in engagement with the teeth jj by meausoi' springs l, placed beneath projecting ears m and resting upon cross bars or braces a of the base-frame A.

The rack-bars lc k are separated to correspond with thebranehes g i of the depending extcnsionfof the swinging frame B, and the middle branch, It, of said extension passes between said bars, which thus serve to retain the parts in proper relation and to guide the depending extension f in its movement over the rack.

So long as the locking-l`rame is held up by the springs l the teeth k lc are held in engagement and the swinging yoke B is held against movement; but by pressing down upon either ol' the ears m m of thc locking-frame C, which may be done from either side of the chair, the parts are disengaged and the yoke l is made free to be swung in either direction.

To prevent the yoke l5 and the body ol the chair which is carried thereby from falling` over of its own weight when the yoke is thus unlocked, I attach to the front and rear sides' ol' the middle branch, h., ofthe depcndingextensionfsprings o, the outer ends of which are carried and attached to opposite sides ol' lhe baselrame A. 'lhes'e springs couuterbalance each other when the yoke l5 is in a vertical position, and consequently tend to maintain it in such position and to bring it back thereto whenever it is swung to one or the other side.

Of course the springs o can only act when the teethj and racks k are out of engagement.

The tubular neck lcof yoke B is threaded in' ternally to receive a correspondi ngly-threaded stem, D, which carries at its upper en d the rotary frame E, which supports the body of the chair. The screw permits the height of the chair to be varied as desired, as in other chairs of like construction.

It is desirable, and, in fact, is necessary, in surgical chairs to provide means for lo'eking the parts so that the body shall for the time be incapable of rotation, and for this purpose I provide the clamp F. (Illustrated in Figs. 2,

3, and 6.) This clamp consists of three parts,

p, q, and r. (Shown separated in Fig. 6 and in operative position in Figs. 2-and 3.) The parts 2o p and q are levers provided with perforated ears r', by which they are connected with similarly-perforated lugs s, formed uponand depending from the rotary frame E on opposite sides of thescrew-stern D. The partq is made with a loop or band, t, which encircles the screw-stenrand the neck e, and the partp is provided above its pivot with a threaded hole, u, to receive the thumh-screw r, which forms the third part of the clamp, and which, by bearing against the loop t, forces the upper ends of parts p q apart, tb rows their lower ends toward each other. and causes them to firmly clasp the neck e of the yoke B. As the yoke cannot rotate, and as the parts p q are pivoted to the rotaryframe, saidf frame and yoke are firmly held together and the frame is held against rotation. Thus it will be seen that provision is made for swinging the chair-body, which is carried by the rotary frame, from side to side, or, by turning it more or less, for swinging it forward or backward or at any inter|nediate angle, and also for raising and lowering it and for locking it at any elevation against rotation.

It now remains to explain the construction and operation of the body, head-rest, and foot-v rest.

' As shown in Figs. l, 2, and 4, the rotary frame E consists of a substantially-horizontal 5o cross-bar somewhat longer than the width of the chair seat and back, and having at its end an upright or vertical portion consisting of two arms or branches, c and w.

The body of the chair consists of a back, G, a seat, H, a leg-rest, I, and arms J, and to these three parts are addeda head-rest, K, and foot-rest L.

The back G is supported between the arms 'v by pivots ai, on which it may be tipped to 6o any position from vertical to horizontal.

To hold the back rigidly at anydesired adjustment, I pivot to its lower end at one or at bothsides, preferably both sides,aslotted link, M, advisably curved, as shown. A rod, N,

passes through the link or links and is journaled at its ends in lugs formed on the rotary frame E, as clearly shownA in Figs. 1, 2, and 4,

both ends of said rod being furnished with a. hand-piece or lever, so that it may be controlled from either end. The rod is threaded neareach end, the direction of the threads at opposite ends being reversed, one being right and-the other left. Upon each threaded portion is placed a correspondnglythreaded nut, O, having a lug. y, extending into the slot of the link M, against which the nut rests, the lug serving to preventv the nut from turning with the rod. From this construction it follows that ifthe rod be turned in one direction it will cause the nut-s to be drawn forcibly against the links, clamping the latter between the nuts and the end plates of the rotary frame, while if the rod be turned in the other direction the nuts will be moved back and the links released, leaving the back free tobe adj usted.

The arms J are jointed to the back G above the pivotal supports of the latter, and they are similarly jointed to ,L-shaped blocks or levers P, which are in turnpivoted to the forward arms, `w, of the rotary frame E. Byreason. of 9o this arrangement andinanner ofsnpporting the arms they'are caused to rise and fall with the back,and the blocks or levers P are caused to move with the back and arms.

To the under side of the seat H, near the front thereof', are secured two hangers, z, in which are journaled the ends of a rod or shaft, Q, ofaswing-frame, R-,which is hung by linksv S from the arms w ofthe rotary frame E, and which links are thus caused to sustain the front of the seat, as shown in Figs. 1, 2, and 3, the swing-frame and hangers being alsoshown in Fig. 5. The rear of the seat is supported by links T, hung from the rear arms, v, ofthe rotary frame on the same pivots that support the back l y U indicates a swinging brace pivotally attached to the blocks P at or near the angle formed by the meeting'of the two arms of said blocks,as best shown in Fig. 1. This brace is constantly drawn toward the swing-frame R by a spring, V,which is attached at one end to the brace and at the other end to the rod Q. The purpose of this brace is to hold the swingframe Rin the proper position relatively to the other' parts, and thereby to bring about and maintain a certain desiredv relation between the back and seat.

As shown in Figs. l, 2, 3, 4, and 5, the side or end pieces of the swingframe Rare notched r 2o or formed with shoulders a', in or with which the swinging end ot' the brace U engages when the frame R is drawn back sufficiently to permit such engagement.. When the parts mentioned are thus in engagement, if the back G be thrown downward to or toward a horizontal position, carrying with it the arms J and the levers or blocks P, the brace U, moving with the blocks P and bearing upon the swingframe R, causes said frame to swing about its point of attachment to the arms w of the rotary frame, and in this way the seat is elevated .to the level which the back assumes when taking a horizontal position. lhe links IIO T also swing npon their pivots and cause the rear of the seat to move with the front, and thus to maintain a proper horizontal position.

\Vhceevcr it is dired to drop the seat to its normal level without raising the back, it is only necessary to throwthe brace U outofen gagement with the frame R, as shown in Fig. 3, whereupon the seat will vdrop to the position there shown. I

livoted to the hangers z are two metal bars, V, to which is secured thc leg-rest I, and to the lower outwardly-bent ends of which the foot-rcst L is pivotcd, as shown in Figs. 1, 2, and 3.

The leg-rest is a tixture upon the bars W,

and is merely a level surface, either uphol# stered or of cane, rattan, or other suitable material to correspond with the seat and back, which may of course be finished in any desired manner. The footl rest is simply a at board or platform ot wood or metal, and is formed with ears or lugs b', extending backward in rear of its pivots. To each of these ears or ings I attach one end of a rod or brace, X, the other end of which is attached to one of the hangers z, as shown in Fig. 7, at the same distance from the pivot c' of bar W as the' lower cud of the brace is from the pivot d ot' the foot-rest. This construction and arrangement causes the foot-rest to maintain at all times a horizontal position, regardless of the inclination of the leg-rest, the position of the seat, or that of the back.

'lhe bars \V are cach provided with a swinging hook, Y, adapted to engage with a stud or pin, e', of which there is one on the inner face of each end plate of swingframe R. \Vhen the hooks are locked upon `the studs or pins, they canse the leg and foot rests to move with the swingtframe It; hence whenever the brace U is in engagmncnt with said frame and the back is thrown down the seat is raised into the saine plane with the back, and the leg-rest and foot rest are raised to thesaine horizontal plane, thus forming one continuous level surface. as in Fi g. 2.

It' it be desired to drop the leg or foot rests, the hooks Y are disengaged from the studs or pins e', and then said parts may be lowered to the position shown in Figs. 1 and 3.

The headrest K is carried by two slotted bars-, f, moving in guides or eyes g at the back ofthe chair, and by clamping-screws h', passing through slotted brackets z" and serving to bind and hold the bars wherever adjusted. By this arrangement I am enabled to set and fasten the head-rest wherever desired and lo throw it forward or backward more or less.

lnstead of pivoting the brace U to the levers or blocks 1, it may be pivoted directly to the lower end or odge of the back`v (l. So, too, instead of employing two slotted links t'orvholding the back at the desired angle, a single link may be employed.

Having thus described my invention, what I claim is- 1. Tile herein-described chair, consisting of base A, yoke B, suspended within said base, locking fratrie C, adapted to hold yoke B against swinging, rotary frame E, carried by said yoke, back G, pivoted int-hc rotary frame, blocks or levers P. pivoted to the front of the rotary frame, arms J, connecting said levers withl 'the'back, scatH; suspended from rotary frame E by swingframc R, brace U, pivoted to the blocks or levers P, links T, supporting the rear edge of the seat, arms W, provided with legrest I, t'ootrest L, pivoted to arms W, and rod or brace X, attached at its lower end to the t'ootrest and at. its upper end to the seat, all substantially as described and shown.

2. in a chair, the combination of a base, A, a yoke, B, suspended therein, adapted to support the chair-body, and provided with a depending extension, f, having branches g h i,

the branches g and i provided with teeth j, and locking-frame C, provided with toothed racks k k. adapted to engage the teeth] to hold thev yoke at any desired inclination.

. 3. The combination, substantially as set forth, of base A, swinging yokc B, carrying the chair-body and provided with a downward extension having toothed branches g and i and intermediate brauch, h, springs o, attached to the'base and to the opposite sides of the branch h, lockingframe C, pivoted to hase A and provided with reversed racks 7c, and springs l, serving to hold the racks in engagement with the teeth j.

4. In combination with a base and with a threaded tubular neck, e, a threaded stem, l), itting said neck, a frame carried by said stein and adapted to support the body ofthe chair, and a clamp carried by said frame and adapted to clasp the tubular net-k, whereby theI fratrie .and neck may be locked together and the former prevented from turning independently of the latter.

`5. rIhe combina-tion of a base and a tubular IOC IOS


threaded neck'supported thereby, a threaded Y stem, D, a frame, E, carried by said stem, and a clamp, F, consisting of the parts p q, pivotall y attached to said frame and adapted to bear against the opposite sides of the tubular neck, and the screw-stem r, passing through the part p and bearing against the loop t of part q, substantially as shown.4

6. In a chair, the combination of a base, a yoke or frame suspended in said base, a stem free to rotate in said yoke and serving `to support the body of the chair, aelamp adapted to lock said stem against rotation, and a locking Ils device adapted to engage the swinging yoke and tohold itat any desired inclination, whereby the body ol' the chair may be tipped to any desired angle forward, backward, or to either side.

7. In'eombination withasupporting-frame, i

to arms w, arms J,l connecting back G and levers P, seat H, swing frame R, pivotally attached to the seat,brace U, pivoted to the,

blocks or levers P andadapted to engage with swing-frame R, and links T, connecting the arms v and the rear side of seat H, wherebyV the seat is caused to risc as the back is depressed. p

9. In combination with a supporting-frame, back G, pivoted therein, seat H, connected at its rear edge to the arms v by links T, swingframe R, Illing in bearings carried by the seat and suspended from the supporting-frame, levers or blocks P, pivoted to said frame, arms J, connecting the levers P and the back, bars W, pivotally attached to the seat and provided with hooks Y, to engage with studs e on the swing-frame R, leg-rest I, secured to said bars, foot-rest L, pivot-cd to the bars W, bracerod X, attached to the seat and to the footrest, and brace U, attached to blocks P and arranged to engage with the frame R.

10. The combination, with a base and a frame, E, of back G, pivoted in said frame, levers or blocks P thereto, arms J, connecting back G and levcrs P, seat H, swing frame R, hung in bearings attached to the seat and suspended by links S from frame E, brae U, pivoted to levers P, and links T, connecting the seat and back, substantially as shown and described.

11. The combination, substantially as set forth, of a supporting-frame, a seat, bars W, hung from said seat and carrying a rest for the limbs, a swing frame, R, hung 1n bearings carried by the seat and provided with tuds e', hooks Y, attached to the bars and adapted to engage with said studs,and a swi nging brace, U, adapted to engage with or disengage from frame R at will, whereby the rest may beheld in a horizontal or vertical position, as required.

, also pivotally attached,

`12. In combination with a surgical-chair body having guides g', slotted brackets i', and clam ping-screws h', head-rest k, providedwith slotted bars f ,whereby the rest may be Araised and lowered, brought forward, or thrown back, at will.

' 13. In a surgical chair, the combination of a base, a frame or yoke mounted therein and adapted to rock or tip laterally, a locking device adapted to engage with and to hold the frame or yoke at any desired angle of adjustment, and a vertical stem swiveled in said yoke and supporting` the entire chair-body.

14. In a chair, the combination of a base, a yoke or frame suspended therein and adapted to tip or rock laterally, adapted to engage said yoke it in any desired inclination, and a chair-body supported by said yoke or frame and pivotally attachedthereto, whereby the chair-body m'ay be tipped to any desired angle forward and backward,'the chair-body being connected with the yoke or frame by a swivel, whereby or frame and hold fit is adapted Ito rotate independently of the yoke or frame.

15. The combination, substantially as set forth, oi' a supporting-frame, a seat, bars W, suspended from said seat and carrying a rest for the limbs, a swing-frame, R, suspended from the supportingframe, constructed toV carry the front end of the seat, and having 'studs e', and hooks vY, pivot-ally attached to the bars Wand constructed to engage with or be disengaged from said studs e' at will, whereby the leg-rest may be held in a vertical or horizontal position while the seat and back are in a common plane.

In testimony whereofI aiix my signature in presence of two witnesses.


Witnesses: v


a locking device

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