US1371507A

US1371507A - X-ray stand and table

Info

Publication number: US1371507A
Authority: US
Publication date: 1921-03-15
Anticipated expiration: 1938-03-15

Description

w-. MEYER. X-RAY STAND AND TABLE. APPLICATION FlLE D Al fi. I2, 19I8.

Patented Mar. 15,1921.

4 SHEETS SHEET I.

W. MEYER. X-RAY SIA-ND AND TABLE.

v APPLICATION FILE? APR. 12'. 1918. Mar. 15,1921.

4 SHEETS-611E151 2- w. MEYER.. X-RAY STAND AND TABLE.

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d mmr William? 7% w CZfiIOJJLQZjD 6 Wm Q 3 av 5 1 1 w n m w. m. m

W w W W O\ n" w m m w 2 5 UNITED STATES PATENT OFFICE.

WILLIAM MEYER, OF CHICAGO, III'JZL'II'NOIS.

' X-RAY STAND AND TABLE.

Specification of Letters Patent Patented M r. 1921 Application filed April 12, 1918. Serial No. 228,104.

T o all whom it may concern Be it known that LNVILLIAM MEYER, a

citizen of the United States, and a resident of Chicago, in the county of Cook and State v of Illinois, have invented a certain new and useful Improvement in X-Ray Stands and Tables, of which the following .18 a full, clear, concise, and exact description, reference being had to the accompanying draw I 'To this end I have provided a table stand having a pivoted top which can be tilted to any desired angle to place the patient in any preferred position for making the exposure or administering the electro-therapeutic treatment.

I find it desirable to employ one tube for making fluoroscopic examinations and a separate tube for taking radiographs.

The tube for making fluoroscopic examinations I mount on a carriage supported for rolling motion beneath the table top, the. rays from the tube. passing through the table top. I dispose the fluoroscopic screen above the table top in convenient position for fluoroscopic examination. The fluoroscopic screen is preferably supported upon the X-ray tube carriage and moves therewith. Adjustments are provided for adjusting the fluoroscopic screen toward and away from the table top and for adjusting both the X-ray tube and fluoroscopic screen longitudinally and transversely of the table to The tube for taking radiographs is mounted upon a standard adjustable longitudinally of the table stand. The tube is mounted to be universally adjustable relative to the tabletop so that it may be brought into proximity to the desired object in substantially any' position to properly direct the rays thereupon. An additional feature of the mounting of the tube is the arrangement whereby the tube may be quickly and accurately shifted for taking multiple exposures from different focal points as in the taking of thereoscopic radiographs.

This particular apparatus and procedure is set forth in detail in my copending applicailagolns, Serial No. 217 ,7 38, filed February 18th,

In conjunction with'this featurev I have provided a novel arrangement of the plate changer apparatus in myimproved table for taking a number of radiographs in quick succession. The automatic shift of the plate changer carriage is obtained by novel spring means. Regulable speed control means for governing the speed of the shift to prevent breakage of the plates is provided.

The fluoroscopic tube carriage has a fluoroscopic screen rigidly but adjustably connected to it and has a sliding counterweight so that it will remain in equilibrium in all adjusted positions and at all inclinations of the table top. The carriage and counterweight work on opposite sides of the pivotal axis of the table top and accordingly their moment arms neutralize each other and thus preserve the balance of the table top for all positions of the tube carriage. The table top is held at any desired inclination by a pedal-operated quadrant latch operable from different positions about the table. The above features have for their object to minimize the effect required to position the patient and to adjust the tubes and other apparatus.

To prevent any possible stray radiation of rays from the fluoroscopic tube, with a consequent burning of the operator, I pro- .vide particular closure means for sealing the end and slots of the protecting shield. This closure means assumes the form of a cover for the end and slide members for the slots composed of yieldable material which will. not injure the tube or shield but which will be impenetrable to X-rays.

My invention is further characterized by numerous structural features such as constructing the table top frame with side channel members having open or slotted inner sides which serve astracks or guides for the plate changer carriage. Another structural feature isthe novel manner of attaching the horizontal guide to the'vertical tube standard. Ordinarily, the standard is not of heavy enough material to hold cap or screws tapped into the same, and accordingly I weld a plurality of studs to the changer carriage with the tray partly removed therefrom-;

Fig. 4 is a perspective view of the protecting plate; v

Fig. 5 is a' sectional view similar to F 1g. 2 through the tablestand showing in elevation the rear or under side of the upright table top;

Fig. 6 is a plan sectional view through the table top to clearly show the plate changer carriage; s

Fig. 7 is an isolated elevational view of the front of the X-ray tube carriage;

Fig. 8 is a fragmentary end elevational View of one upper corner of the table top; Fig. 9 is a side elevational View of the Z same;

Fig. 10 is a sectional view of the protecting shield for the X-ray tube showing the rubber cap and slides for sealing the shield;

Fig. 11 is a fragmentary plan view of the same;

Fig. 12 is a side elevational view of the tube carriage;

Fig. '13 is a detail sectional view of the vertical standard and guide therefor; and

Fig. 14 is a sectional view taken on the line 1414 of Fig. 1.

Referring first to Fig. 1, the table top 16 is pivoted on the side brackets 17 to the lateral extensions 18 of the table stand.

This stand consists of two U-shaped frame .

members

19 and 20 connected on one side by, the top and bottom

tubular members

21 and 22 and on the other side by the. bottom tubularmember 23, (Figs. 5 and 14). The head frame 20 has integral hub extensions 24projecting from the left side, as viewed I in Fig. 14, which support the top and

bottom rails

25 and 26, which are provided for supporting and guiding the X-ray tube standard 27. These guiding

rails

25 and 26 aresecured bybrackets 28 and 29,1 see Fig. 5, to the other frame member 19. The gulding rails extend beyond the table stand and have their ends connected by a standard 30. The different frame members are all equipped with casters to facilitate moving of the table.

The open ends of the stand formed by the

U-shaped members

19 and 20 receive the table top when the same is lowered without interfering with the X-rav tube carriage or other apparatus.

To hold the table top in the upright or,

different inclined positions, I have arranged a treadle operated lock operable from either the end or side of the table" stand. This quadrant lock comprises a airof quadrants 31 screwed to the frame c 'annel 32 of the table top and passing through slots in the web of the U-shaped frame member 19. A pair of spring detents 33 are uided in lugs protruding from the web of t 1e frame member 19 and normally engage in the notches of the quadrant under the action of the compression springs 34. I The lower end of the detent rod 33 is pivoted to a short lever 35 mounted upon a transverse rock shaft 36 which is journaled in the sides of the frame member 19 (see Figs. 2 and 5). A pair of treadles 37 are pivoted in bifurcated lugs projecting from the

tubular frame members

22 and 23 on each side of the table stand. Each treadle has an arm bearing under the extending end of the lever 35. I

Another arm 38 pinned to the rock shaft 36 has pivotal connection with a rod 39 extending up to the head end .of-the table stand. Here the rodhas pivotal connection with an arm 41 pinned to a transverse treadle shaft 42. which is iournaled in lugs.

extending from the head frame member 20: A treadle 43 is secured to this latter shaft in convenient position to be depressed by. v

the operator when he isstanding at the end a of the table: Obviously, depressing of either the side or end treadles will rockthe shaft 36 and retract both detents from the notches in the quadrants.

A folding footboard 44'is hinged to the foot end of the table top 16 and has slotted links 45 for holding the boardhorizontal .when' the table top is upright as shown in Fig. l. the foot board folds down and increases the When the table top is horizontal,.

effective length of the table top. Al screw secured to each channel 32 Works in a slot in the link 45, each slot having an offset notch engageable over the shank of the screw to hold the footboard 44 horizontal.

The footboard 44 is counterweighted' to counterbalance the weight ofthe upper end of the table top and the weight'of the tube and; plate carriages. The patient stands upon the folding footboard 44 when it is desired to make an exposure or treat or examine the patient in an upright position. I v Referring to Figs. 8 and 9, the table top 16 is builtup of sidechannels 32 joined at their ends by cross-bars 47 welded T or screwed thereto. The frame thus formed is covered by an aluminum'sheet 48 and a comby a cross strip 52 and the side edges off the sheets are secured to the table top by angle strips 53, screwed to the side channels 32. The ends of 'the sheets are turned into grooves 54 in the transverse bars 55 screwed to the ends of the frame as shown in Fi The strips 51 space the aluminum sheet 48 from the top surfaces of the side chan-- nels 32 and form guiding slots therebetween along each side of the table top for the reception of the protecting plate 56. The protecting plate 56 extends down beneath the aluminum sheet 48 to the transverse dotted line illustrated in Fig. 6, which is substantially one-half the length of the plate changer carriage 57. The protecting plate 56 and the plate changer carriage 57 are illustrated in perspective in Figs. 3 and 4. A handle 58 is attached to-the end of the ,protecting plate 56 to permit the withdrawal of the protecting plate at certain times in the operation of the table, as I shall hereinafter describe.

It will be noted from Fig.8 that the channels 32 are ofbox-shaped section having slots 59 in their inner sides. These slots extend from end to end of the table top 16. The plate changer carriage 57 is mounted in these slots and is adapted for rolling motion back and forth beneath the aluminum sheet 48. This carriage is built up of the side channel bars 61 and end bars 62welded together at their corners. Four ballbearings rollers 63 are mounted on studs projecting laterally from the side channel 61 and are arranged to roll in the slots 59in the box channels 32. The rollers are held on their studs by small brackets 64 attached to the side channels 61 and each roller has an annular flange 65 adapted to bear against the slotted face of the channel 32 and space the carriage between the channels.

A plate holding tray 66 is rem ovably supported in the'carriage 57 with its open side facing upward to expose the sensitized plates therein to X-rays penetrating the aluminum sheet 48. The tray is provided with a handle 67 for withdrawing the same from the carriage and a spring hook 68 attached to the end of the carriage normally retains the tray therein.

This tray is arranged to hold two sensitized plates, by spring fingers or other well known means, and by shifting the carriage 57 these plates are successively brought beneath the exposure 'zone 48 at the lower end-of the aluminum sheet 48. The auto matic shift of the carriage 57 is .accomplished by a spring reel 69 set obliquely in a counterweight casting 71 which is rigidly fastened in the slots 59 at the lower end of the table. top 16. A steel .tape 72 uncoils from the spring reel- 69 and is attached to a lug 73 on the lower end of the plate changer carriage 57. The spring reel 69 tends to draw the carriage 57 down against the bumper springs 74 illustrated in Fig. 6. This is prevented by a latch 75, pivoted on one of the side channels at the head end of the table top, which latch engages with a strap 76 extending out from the carriage 57 beneath the side channel 32.

A spring 77 tends to hold the latch in set position. To shift the carriage 57 the cord 78 is pulled or the latch is released by the finger, whereupon the carriage is quickly moved toward the lower end of the table until arrested by the bumper springs 74. The carriage is manually retrieved by a handle 79 on the end of the strap 76.

The speed of this shiftin movement is governed by pneumatic cylinders 81 disposed in each of the box channels 32. Operating in the cylinders 81 are pistons 82 shown in dotted lines in Fig. 9, which are connected through the medium of rods 83 and angle brackets 84 with the sides of the plate changer carriage 57. The dashpot action of the pneumatic cylinders 81 is regulable through manipulation of the metering screw 85 which threads into an inlet in the cylinder head. The shank of' the screw 85 is milled off on an incline as is shown in Fig. 9 and it will be apparent that by manipulation of the screw, the restriction of the opening in the cylinder head can be changed to secure the desired carriage speed. The dashpot action of the cylinders is effective upon both the forward and backward movements and thus in no case can the carriage be jarred sufliciently hard to break the plates.

The foregoing includes that portion of my improved table employed in the taking of radiographs. The operation of the apparatus is as follows: I

The patient or object is first placed upon the table top with the latter horizontal, inclinedor upright, as desired. The fluoroscopic screen frame 87 has, of course, been removed. The standard 27 is now rolled along its guide rails to a convenient position for swingingthe adjustable tube supporting'frame 88into proximity to the parts to be radiographed.

The frame 88 and X-ray tube 89 are adjustable vertically and angularly about the standard 27 and in addition may be tilted relative to the standard to direct the X-rays emanating from the compression tube 91 at the proper angle and correct proximity to the object or patient. Thisuniversal ad- 5 justability of the X-ray tube 89'is fully described in my previously mentioned copending application. W'hen a single radiograph is to be taken, a single plate is disposed in the upper or lower end of the tray 66, depending upon the part of the patients body to be radiographed and the protecting plate 56 is withdrawn from above the plate changer carriage. The function of the protecting plate 56 is to prevent stray rays from reaching the subsequently exposed sensitized plate in the taking of stereoscopic radiographs.

To perform this latter operation, the protecting plate is inserted in place and the tray 66 is loaded with two plates. The X- ray tube 89 and the anatomy or object to be radiographed are now brought into line over the lowenportion 48' of the aluminum sheet 18. The first exposure is now made upon the plate at the lower end of the tray 66, the opaque protecting plate 56 preventing stray rays from affecting the second plate at the upper end of the tray. The tube 89 is now shifted a predetermined distance by shifting means on the frame 88 and the plate changer carriage :57 is released to carry the exposed plate beneath the opaque portion 49 of the table top and to carry the unexposed plate in the upper portion of the'-.

tray 66 down into the exposure zone 48'.

The second exposure is now made and thereafter the two radiographs thus taken. with the X-ray tube at different foci are combined into one stereoscopic view through the aid of suitable mirror devices. For accurate results the two radiographs should be taken in relatively quick succession so that there Will be small probability of the patient moving between exposures. The means I employ for shifting the X-ray tube and for shifting the plate carriage will make these 7 transpositions quickly, accurately and with minimum effort on the part of the operator.

The'tube standard 27 is supported and guided upon the guide rails 25 and 26 by guiding members 93, bearing rollers 94 which engage about the peripheries of the

rails

25 and 26. The rollers are pivoted between lugs standing up from the body of the guide members and these guide members do not completely encircle the guide rails 25 and 26 but arecut away horizontally as shown at 95 to clear the

brackets

28 and 29 supporting the guide rails.

Each guide member 93 has formed integral therewith a vertical bracket 93 which is attached to the tubular standardv 27. The

tubing of which the standards are usually constructed is of relatively thin section and I have found it difficult and unsatisfactory to screw the brackets 93' to the standard by tapping into the same with capscrews or the like.

Accordingly, as shown in Fig. 13, I weld threaded studs 96 to the wall of the standard by seating them in recesses therein and welding a fillet 97 around the shank of the stud 96 and in the recess.

The stud 96 projects out through holes in the brackets 93' and nuts 98 threading on the studs draw the bracket up tight against the standard 27.

The upper guide member 93 has attached thereto a' bowed leaf spring 99 provided for receiving and absorbing the shock of thedescending sleeve carriage 100, if it should be pushed down too vigorously. This guide member is also provided with a suitable screw clamp, on the reverse side to that shown in Fig. 1, which can be manipulated to clamp the guide at any point along the guide rail 25.

For making fluoroscopic examinations I preferably employ' an individual X-ray tube 102, supported on the under side of the table top 16, and a fluoroscopic screen 103 mounted in a screen frame 87, which is supported on the upper side of the table top. The X-ray tube 102 is mounted on a carriage 104, which is adapted to roll along rails 105 suspended from the under side of the table top. This arrangement affords adjustment of the tube 102 longitudinally of the table top and a second carriage rolling upon cross rails carried by the first .carriage, afi'ords adjustment of the tube transversely of the table top, as I shall hereinafter describe.

The longitudinal rails 105 are of square section, with their edges turned upward, and

and 109 connected by the square'cross rails 111,'which are welded -to-the inner plates. The plates of each pair are spaced one from the other by shouldered bolts 112, which also I function as pivots for the ball bearing rollers 113. These rollers are grooved to fit on the edges of the rails 105 and are arranged in pairs above and below the rails, as shown in Fig. 1.

A secondary carriage consisting of th lengthwiseboard 114 and the four grooved ball bearing rollers 115, is arranged for rolling motion along the cross rails 111, the rollers 115 engaging uponthe outer edges of the rails 111. An inclosing structure 116 attached tothe front plate of the board 11 1, incloses the iris openings and operating mechanism therefor which arecontrollable,

through the medium ofthelinks 118 and handles 119 on the laterally extending board 121, to adjust the field and definition of the exposure. The details of this mechanism form no part of thepresent invention.

On the back side of the board 114 is supported the lead glass shield 122, having a beaded rim 122' wedged between the two' spaced boards 123, secured to the longitudinal board 114. A lid 124 of wood or the like closes the open end of the lead glass shield 122 and has lateral ears through which clamp rods 125 having anchorage in the boards 123. Interposed between the lid tures 131 in the slides.

124 and the opening of the shield 122 is a disk 126 of compositional rubber or similar resilient material containing a percentage of lead or other substance opaque to X-rays. This disk is preferably bolted to the lid 124 by bolts 127.

The shield 122 must necessarily be slotted .to receive the extending limbs 102' of the X-ray tube 102. In pursuance of my object to completely seal the shield 122 against ray penetration, I dispose tongue shaped rubber slides 129 in the slots 128. These slides are. of a compositional rubber similar to the disk 126 and have their edges grooved as indicated by dotted lines to embrace the margins of the slots 128. The extending limbs 102' pass through snugly fitting aper- The disk and slides cushion the fragile X-ray tubes and shield and in addition prevent stray efliux of injurious rays from'the shield.

The extending limbs 102 .of the X-ray tube clamp between rubber cushions 132' on the wood cross bars 132. These cross bars are adjustably mounted on the parallel uprights 133, which are supported in two wood blocks 134 spanning the spaced boards 123. The extremities of the limbs 102' have electrical connection with the two sheathed

conductors

135 and 136, which are mounted in the wood bracket 137 -on theupper end of the lengthwise board 114. At their upper ends these conductors have connection through eyelets with leads from the induction coil or transformer.

Referring again to the side plates 108 of the tube carriage 104, there are four apertured guiding lugs 139 extending laterally from the edges of the outer side plates108. These lugs constitute guides for the parallel extensions 141 from the fluoroscopic screen frame 87, shown more ,clearly in Fig. 12.

- The extensions 141 are braced by a strut' 142 and have their ends welded to one of the end members 143 of the screen frame; The upper and lower frame members 87 are of round section and are welded to the end members 143. The upper and lower edges of the fluoroscopic screen frame 103 are grooved to have guiding engagement transversely of the table top 16 along the round frame members 87. By sliding the frame through the.

guiding lugs 139 to and from the table top, the field and definition of the fluoroscopic exposure'on the screen 102 can be adjusted as desired. To prevent the operator from accidentally pulling the extensions 141 completely out of the guiding lugs 139 in making adjustments, I have provided a spring hook 144 in the end of-the upper extension 141. A small leaf spring 145 supports the hook 144 and extends into the hollow end of the extension 141 and is rivet-ed to the wall thereof. By depressing the hook 144 the extensions 141 can be cleared of the.lugs 139 to permit removal of the frame 87 as for the taking of radiographs as previously explained.

The fluoroscopic screen 103,. being sup ported on the tube carriage 104, will of course follow and be alined with the fluoroscopic tube 102 in its longitudinal adjust- 103 may be shifted in the frame 87 as desired, and the secondary carriage supporting the fluoroscopic tube may be rolled along the cross rails 111. Bumper springs 146 (Fig. 7) prevent jarring of the fluoroscopic tube if the secondary carriage should strike the

side plates

108 and 109.

I counterbalance the tube carriage 104 by the counterweight 147 which rolls along the rails 105 at the foot end of the table top 16. This counterweight comprises the main ment. For transverse adjustment, the screen 4 counterweight casting 147 and the two pairs leys 151. A pairof cables 152 are trained over the upper pulleys 151 and have their ends attached to lugs on the upper side of the tube carriage 104 and to lugs on the upper side'of the counterweight 147. A second pairv of cables 153 are attached to lugs on the under side of the tube carriage 104 and are trained down around the lower pulleys 151 and up 'into'attachment with lugs secured'to the under side of the counterweight A pair'of bumper springs 154 attached to the lower end of the table top frame limit the descent of the counterweight 147 and another bumper spring 155 attached to the bottom of the transversely moving tube carriage (Fig. '7) prevents jarring impact betweenthe counterweight 147 and the. tube so that their aggregate weight will nicely counterbalance the tube carriage 10 i and the upper end of the pivoted table top. Due to the counterbalancing action of the counter.-

weight 147, the fluoroscopic tube carriage 104 will remain in any adjusted positlon at all inclinations of the table top.

In making fluoroscopic examinations the patient is placed upon the table top in upright, inclined or horizontal position and the tube carriage 10 i is adjusted to bring the fluoroscopic tube 102 beneath the part of the filed February 18, 1918.

body to be examined. The protecting plate 56 and the plate tray 66 are removed so as not to obstruct the transmission of X-rays through the aluminum sheet 48. The adusting of the iris opening and ofthe fluoroscopic screen to obtain proper field and definitionis of general knowledge tothose skilled in the art.-

For administering X-ray. treatment the compression tube 91 is removed and the tube 89 is'brou ht into relatively close proximity to the patient to bring him under the influence of the short rays. The tube is operated at a'relatively 10w currentlval'ue to minimize or soften the long penetrative rays. This mode of treatment is fully explained in my No. 217,738,

copending application Serial I do not intend to be limited to the .particu lar detailsherein shown and described;

1.'In an X-ray'table, end members, side members connecting. said 'end'members, a table top, said table top being pivotally secured to the upper -portion of one of the said end members, a carriage carried by the said table top, an X-ray tube supported by the sald carriage, a fluoroscopic screen frame rigidly supported solely on the said carriage,

said screen frame and'said tube being disposed on oppositesides of said table top so that the screen will always lie in register while thus held. l

J 8. In an 'X-ray table, a pivoted table top,

with the tube for all positions of the tube. 2. In an X-ray table, a table top, a top supporting frame, an end member for the said frame, said table top being pivotally supported near an upper portion of the said end member, meansadapted to support an X-ray tube beneath the said table top and a fluoroscopic screen above said table top, said means'holding said screen parallel with the. ;sa1d'table top throughoutthe various angular positions thereof, said fluoroscopic screen being adjustable longitudinally, transversely and perpendicularly to said table top.

3. Inan X-ray table, a table support, a

table top, said table top being pivotally mounted onthe said support, near an upper portion thereof, whereby said table top may rotateon said support, means adapted to support an X-ra tube-beneath said table along said guiding rails.

top, a fluoroscopic screen, holding means thereof to hold the said screen parallel; to

the said top and above the said top throughout the various angular, positions thereof, said fluoroscopic screen being adjustable longitudinally and transversely of said table top.

comprising two U-shaped end members,

guide rails connecting said end members, a

table top pivoted in one of said end members, a guiding rail supported on said end members, and an X-ray tube supporting standard mounted onsaid guiding ,rail and adapted v if for sliding motion along the same.

- 5. In combination, an X-ray. table stand comprising two U-shaped end members,

here, a pair of guiding rails ,supportedfon said end members, said'rails extending be- 4:. In combination, an X ray table stand guide rails 'connecting said end members, a

table top pivoted in one of said end memyond the frame member in which said table v top is pivoted, anvertical member connecting the extending ends of said rails andan X-ray tube supporting standard" having guides engaging with said guiding rails, said standard adaptedfor rolling motion gaging with said guidingmeans, transverse guiding means on said carriage, a secondary carriage adapted for movement along said latter guiding means transversely of said first ,carriage, said secondary carriage'adapted to support an X-ray tube, and counterbalancing means for said carriages;

7. In anX-ray table, a pivoted tabletop, a fluoroscopic screen arranged above the table top, meansholding the screenparallel with the table a top throughout the various argular positions thereof, said screen being adjustable from and toward the table top on the opposite side of the table-top,'said screen held parallel with the'" -table top. throughout the various angulanpositions thereof and adjustable in parallel relation from and toward the table top. g

9. In an X-ray table, a frame, a table top pivotally mounted on the frame between the ends of the table top 'formove'ment from a substantially horizontal position :to' a substantially vertical position, a carriage adapted to carry an X-ray tube mounted for longitudinal movement along the bottom of the table topwhen ineither of said positions,

a fluoroscopic screen carried by said carriage and positioned above the table top, means counterbalancing said carriage and parts carried thereby, said fluoroscopic screen being movable both transversely and vertiis horizontal, and means for holding the foot board substantially perpendicular to the top when the top is inclined or vertical.

11. In combination, a pair of U-shaped;

frames, longitudinal, members connecting the frames to form a base, a table top pivoted substantially centrally to one of said frames, a quadrant connected to the table top, a vertically movable latch mounted on one leg of said one frame, a rotatable shaft having means for withdrawing the latch, said shaft extending to the other'leg of said one frame,

a pedal and lever for-operating said shaft,

said pedal being mounted adjacent said one frame and a pedal connected to said shaft and mounted adjacent the'other frame for releasing the latch from the head of the table.

12. In combination, a transverse U-shaped frame member, a second transverse frame member, longitudinal members .fastening said frame members together, a table top pivoted substantially centrally to the legs of said U-shaped frame member, a guide rail secured at the head end of the table to the second transverse frame member and extending past the U-shaped frame member to a point adjacent the foot of the table top, and a vertical frame member connected to the guide rail said guide rail serving to guidea tube stand.

- 13. In combination, a transverse U-shaped frame member, a second transverse frame member, longitudinal members fastening said frame members together, a table top pivoted substantially centrally to the legs of said U-shaped frame member, a guide rail secured at the head end of thetableto the second transverse frame member and extending past the U-shaped frame member to a point adjacent the foot of the table top, a vertical frame member connected to the guide rail, said guide rail serving to guide a tube stand, and means for holding the table top in any desired angularposition, said means being provided with releasing means mounted at the head of the table and at the central partofthe table top. Y I

14. In combination, a pivoted'table top, brackets on the lower side -of the table top at each corner thereof, longitudinal guide rails having their ends supported on said' brackets, sheaves having axes lying in a said sheaves being mounted on the sides of the brackets, a carriage for mounting a fluoroscopic tube having rollers mounted on said rails, said rollers lying diametrically above and below the rails whereby the can plane substantially parallel to the table top,

riage may employ, the full space between the vrails,a counterbalance mounted on the rails and cables-trained over thefsheaves and-connectin the carriage andthe counterbalance.

15. n combination, a pivoted table top, brackets on the lower side of the table top at each corner thereof, longitudinal guide rails between the pairs of brackets on each side, sheaves mounted onthe sides of the brackets,

'a-carriage for supporting a fluoroscopic tube mounted on said rails, a counter balance mounted on said' rails, and cables trained over said sheaves for connecting the carriage and the counter balance, a fluoroscopic tube mounted for lateral motion on said car-v riage, and a fluoroscopic screen mounted on a bracket connected to the carriage and extending over the table top, said screen being adjusted with pivotal movement of the table. top to lie over -the fluoroscopic tube, in the various angular positions ofthe'table top.

16. In combination, a table top having a portion thereof penetrable to X-rays, a channel lying along each side edge of the top, said channels openin inwardly, brackets mounted on the ends of the channels for supporting guides for a fluoroscopic tube carriage, a plate holder carriage adapted to lie below said penetrable tabletop, said carriage being guided in said channels, meansAfor automatically shifting the plate holder carriage, and dash pot means lying within the channels.

17. In combination, a tabletop having aportion thereof penetrable to X-rays, a channel lying alongeach side edge of, the top, said channel opening inwardly, a bracketmounted at each end of each channel, side rods between the brackets lying along the side edges of the tabletop, sheaves atthe sidesof th'ebracke'ts, a carriage fora fluoroscopic tube mounted on said guide rods, a. v counter balance also mounted on the guide v, rods, and a plate holder carriage guided in the channels between the fluoroscopic tube carriage and the table top, and dash pot, 1

meanslying within one of the channels for controlling the movement of the plate holder carriage.

18. In combination, a table tophaving a portion thereofpenetrable to X-rays, a box shaped channel lying along each side edge of the top, each channel having inturned edges ion the side facing inwardly, straps tylng the ends of the channels together, a bracket at each corner of the table top fastened over the ends of said channels, guide rods running between the brackets ateac'h side of the table, a fluoroscopic tube carriage mounted on said guide rods and a plate holder carriage having rollers running on the ed es of the channels.

19. In combination, a table top having a portion thereof penetrable to X-rays, a boxdisposed within the box shaped channel, a

s rim for movin the late holder carria e P s s P g and releasable connections with the plate holder carriage for permitting the withdrawal of said carriage.

20. In'combination, a rectangular table' top having a portion thereof penetrable to X-rays, a rectangular channel bar lying along each lower side edge, said channel bars having their open sides facing toward each other, a bar at each end tying the two channels together, brackets mounted on said bars, longitudinal mounted on saidbrackets, a .tube carriage movable on the guiding means and a plate holder carriage between the tube carriage and the table top, said plate holder carriage having rollers guided along the open sides of the channels and being removable for fluoroscopic work with said tube.

21., In combination, a horizontal guide rail, a'vertical column tube guided on said rail, a roller carriage mounted onsaicl guide rail, said carriage having a vertical saddle portion adapted to fit the surface of the column, said column comprising a tube of relatively large diameter and having relatively thin walls, depressions in said walls, studs set in said depressions and welded therein, said studs extending through the saddle for holding the same to the column 22. In an X-ray table, a table top, a carriage guided alon the lower side of the table top, said carnage having a portion exguiding means tending laterally beyond the table top, an

adjustable, screen holder, said holder being L-shaped and having a portion lying parals lel to the table top and another portion lying substantially at right angles-to the table top, said latter portion being slidably held in said laterally extending portion of the carriage to permit the parallel portionof the holder to be adjusted toward and away from the table top.

A 23. In an X-ray table, a table top, a carriage guided along the lower ".fi side of the table top, said carriage having a portion extending laterally beyond the table top, an adjustable screen holder, said holder being L-shaped and having a portion lying parallel to the table top and another portion lying substantially at right angles to the table top, said latter portion being slidably held in said laterally extending portion of the carriage to permit the parallel portion of the holder to be adjusted toward and I away from the table top and a fluoroscopic screen guided on said parallel portion to permit motion of the screen in a plane parallel to the table top across said table top.

24:. In an X-ray table, a table top, guide rails mounted on the lower side of the top, a carriage movable along said rails, said carriage adapted to support a fluoroscopic tube, an adjustable bracket extending up wardly along the one side of the 'table 'top and over the table top, leaving the opposite side of the table top clear for the entry of the patient, a fluoroscopic screen mounted on the bracket parallel to the table top, a

shutter for controlling the effect of the fluoroscopic tube and shutter controlling means projecting from the side of the table top 0 posite said bracket. v

25. 11 an X-ray table, a pivoted table top, a fluoroscopic screen and means for holding said screen substantially parallel with said pivoted table top throughout the various angular positions thereof.

26; In an X-ray table, a pivoted table top, a fluoroscopic screen substantially parallel with saidpivoted table top, and means for shifting the plane' of said screen with angular adjustment of said pivoted table top to maintain the parallelism therebetween.

In' witness whereof, I hereunto subscribe WILLIAM MEYER.