US2373442A - Dental equipment stand - Google Patents

Description

DENTAL EQUIPMENT $TAND Original Filed April 5, 1959 5 Sheets-Sheei 1 rps4,

Zmnentor 305E11 a/llyell,

April 10, 1945 R. C. ANGELL DENTAL EQUIPMENT STAND I Original Filed April 5, 1959 5 Sheets-Sheet 2 Gttorueg April 10, 1945. R. c. ANGELL DENTAL EQUIPMENT STAND Original Filed April 5, 1939 5 Sheets-Sheet 3 v Zinpentor Jib/9PM CAR 06]! wyzmw (Ittorneg April 10, 1945. R. Q ANGELL 2,373,442

Q I I DENTAL EQUIPMENT STAND Original Filed April 5, 1939 5 Sheets-Sheet 4 FlCi': 9;

i'ioezi C flizgdl, 8g 4 attorney Patented Apr. 10, 1945 DENTAL EQUIPMENT STAND Robert 0. Angel], Prince Bay, N. Y., assignor to llhe S. S. White Dental ManufacturingCompany, a corporation of Pennsylvania Original application April 5, 1939, Serial No. 266,174, now Patent No. 2,317,971, dated May 4, 1943. Divided-and this application April 2, 1943, Serial No. 481,579

Claims.

This application constitutes a division from my copending application Serial No. 266,174, filed April 5, 1939, now Patent No. 2,317,971 dated May 4, 1943, and is specifically directed to spray bottle warmer and water tumbler supporting mechanism.

My invention relates particularly to that class of dental equipment assemblages that are adapted to be located adjacent to a dental operating chair and arranged to support, within easy reach of the operator, various instruments, implements, appliances and devices employed in the practice of dentistry, and is especially di rected to its simplified construction, easy accessibility of its enclosed mechanism, wide range of relative movement of the associated parts, and the consequent flexibility in the use of such instruments.

The principal objects of my invention are to provide an assemblage of dental equipment devices embodied in stand or pedestal that is' compact, pleasing in appearance, convenient to operate, readily assembled and taken. apart and that affords a maximum degree of utilityin the practice of the dental profession.

Other objects of my invention are to provide an equipment assemblage comprising a standard or pedestal upon which various relatively adjustable equipment and dental devices may be conveniently moved into relatively different op-' erative positions about the common axis of said standardor pedestal. Y

Further objects of my invention are. to provide a dental equipment stand assemblage in which the frame of the supporting standard is composed of a plurality of frame sections relatively superposed one upon another and secured together to form a supporting skeleton standard stand assemblage having a bracket table rotat-.

ably supported on a swingable supporting arm which is mounted for horizontal movement about the axis of said stand and including a frame carrying connection terminals for gas and air which are connected by flexibletubing spirally coiled about the common axis of said swingable supporting arm and stand with suitably disposed stationary connecting terminals of gas and air conveying pipes extending upwardlythrough the stand or pedestal.

Another object of my invention is to provide a spray bottle warming unit and X-ray illuminator swivelingly mounted at the outer end of a swingable supporting arm which is in turn pivotally mounted on the bracket table arm and arranged'to swing about the axis of the bracket table, whereby said spray bottle warming unit Specifically stated, the form of my invention as hereinafter described, comprehends an equipment stand comprising a pedestal of generally cylindrical formation having a flanged base and a dome-like upper extremity from which pro-' J'ects a cylindriform engine mechanism mounting, and'h'aving horizontally swing able arms disposed at relatively different levels and respectively carrying a bracket table and a cuspidor. Said pedestal is preferably formed of a plurality of separable frame sections each designed to provide specifically for its intended purpose and assembled one upon another in a prescribed order and secured together with their respective axes coincident with the axis of the thus assembled standard which provides a supporting frame standard that may be enclosed by a plurality of readily removable and replaceable substantially semicylindrical casing sections preferably of sheet material assembled to form the cylindriform pedestal structure. The swingable arms for the bracket table and cuspidor are provided with suitably formed casing sections of sheet material which have their inner semicylindrical ends in coincident alinement with the cylindrical wall; formed by the adjacent casing sections and serve to form therewith the complete shell or closure for the above described assembled supporting fragmentary vertical sectional elevational view of the equipment stand pedestal showing the base and upper portion with the intermediate region broken away for convenience of illustration, and including the inner end portion of the bracket table supporting arm; Fig. 2 is a plan view of said equipment stand pedestal including the bracket table. its supporting arm and embodying a secondary or forearm swingable horizontally about the axis of the bracket table and carrying at its free end a combined spray bottle warmer and X- ray illuminator rotatably mounted thereon, about a vertical axis at the free end thereof; Fig. 3 is a front elevational view of the structure shown in Fig. 2; Fig. 4 is a horizontal sectional view of the secondary or forearm which supports the spray bottle heater and illustrates the means for previces and parts, to be hereinafter described, may be mounted for convenient utilization.

The base section I is provided with the enlarged base flange 6 adapted to rest upon the floor and to be secured thereto by the bolts 1 extended through'suitably spaced apertures 8, andhas four upwardly extending legs 9,"terminating in a substantially octagonal perforated elevated plate or platform 10, said platform I being provided with two diametrically opposite outwardly projecting lugs 46 each having a vertical notch or slot I! cut or otherwise formed therein, and indented for a purpose to be hereinafter described.

superposed upon the base section I is the main body section 2 which comprises the relatively spaced parallel plane side wall I!) and 20 reventing entanglement of the electric cords lead ing therethrough to said spray bottle heater and X-ray illuminator when said arm is swung upon its axis of rotation; Fig. 5 is a fragmentary vertical sectional view taken through the electric cord directing guide on the line 5-5 in Fig. 4, a portion being shown in elevation for convenience of illustration; Fig. 6 is a perspective view of the electric cord directing guide which is shown in plan view in Fig. 4; Fig. 7 is a perspective view of the electric cord supporting guide to which said electric cord is attached and guided thereby into the spray bottle heater; Fig. 8 i aperspective View of the clip bywhich said electric cord is attached to said supporting guide; Fig. 9 is a front I elevational view of the spray bottle heater and X-ray illuminator with a fragment of the swingable arm upon which they are mounted, a portion of the forward .wall of said illuminator being broken away to better illustrate the interior parts; Fig. 10 is a transverse centralyertical sectional view of the spray bottleheater and X-ray illuminator assembly, the upper portion of said spray bottle heater being shown in elevation for simplification; Fig. 11 is a fragmentary plan sectional view of the assembled structure shown in Fig. 10 taken on the line li--ll in Fig. 10 and showing a fragment of the spray bottle heater frame; Fig. 2 is a side elevational view of the spray bottle, of which there are two shown in Fig. 9; Fig. 13 is a vertical longitudinal sectional view of the spray bottle heater shown in Figs. 2. 3 and 9 taken axially through the spray bottle receptacle; Fig. 14 is a plan view of the supporting frame of the spray bottle heater shown mounted for rotation upon a fragment of the outer end of the secondary or forearm of the bracket table arm; Fig. 15 is a horizontal sectional view of the spray bottle heater taken on the line I5-l5 in Fig. 13; Fig. 16 is a transverse vertical sectional view taken axially through the water glass receptacle, the X-ray illuminator attached thereto being shown in elevation; Fig. 17 is an enlarged vertical transverse sectional view of the accessory bracket table arm brake and its cooperative brake ring shown in Fig. 1, taken on the line l1 l1 in Fig. 2; and Fig. 18 is a perspective view of one of the similar opposed clamp blocks which retain the opposed friction brake pads, which are shown in Fig. 17.

In said figures the frame forming the supporting standard. comprises the base section L the main body section 2, the combined water niche and cuspidor section 3, accessory table-arm section 4 and the dome or motor section 5, all being assembled by building one upon the other about a unitary common vertical axis in the order named to provide a skeleton standard structure upon which the various operating appliances, de-

spectively terminating at their lower ends in the annular horizontally extended flange 2| and being joined vertically by the transverse wall 23 which is inset from the edges of said wall [9 and 20 but preferably disposed nearer to the rear edges of said walls.

The transverse wall 23 terminates short of the annular flange 2| and merges into the horizontally extended shelf 25 projecting rearwardly from the lower end of said transverse wall 23 and having its curved free edge joining the free vertically disposed rear edges of the side walls I9 and 20.

. The main body section 2 is supported on the base section I and has the four feet 3| which de-. pend from the under surface of the annular flange 21 in relatively spaced relation and rest upon the plate or-platform ll) of base section 1 to which the main body section 2 is rigidly secured by the bolts 32, shown in 'Fig. l.

The combined niche and cuspidor mounting section 3 is superposed upon the main body section 2 and comprises a unitary structure having the four posts or standards 40 terminating upwardly in the top plate or cap 4| unitary therewith and having a central aperture 42 and flange 43, and providing a circular horizontal track 44 and a cylindrical vertical track 45 for supporting bearing structure to be later described.

The accessory table-armsection 4 is superposed upon the water niche and cuspidor mounting section 3, and, as best, shown in Fig. 1, comprises a hollow circular hub 54 having a depending inner rim bead 55 extending int a correspondingly formed recess or rabbet 56 in thecap 4| of the water niche and cuspidor mounting section 3 to which said section 4 is secured by bolts 51, one of which is shown in the plane of section in Fig. 1.

Said accessory table-arm section 4 is provided with the horizontal flange 58 disposed intermediate of its axial length and having a depending annular projection 59 providing a flat horizontal under surface afiording a circular roller bearing track 60 in suitably opposed spaced relation to the circular track 44 on thecap 4|. The upwardly extending portion of said hub 54 is externally re-,

cessed to provide the shoulder 6| arranged to support the annular shelf 62, and terminates upwardly in the inner rim bead 63.

The motor section 5 is superposed upon the accessory table-arm section 4 and serves as a crownpiece or dome for the skeleton standard structure thus assembled. Said motor section 5 comprises the annular floor having the lower edge of. its inner rim rabbeted to. receive the upwardly extending inner rim projection or head 63 on the circular hub 54, and to be secured thereto by the bolts 66, and from which floor 65 rise the diametrically opposite U-shaped standards 61 re spectively curving inwardly at their upper extremities and merging into the annular head 69.

The accessory table arm 10 is adapted to oscillatably swing horizontally about the unitary axis of the standard structure, upon which it is sup-. ported, and its frame II comprises at the free end an annular mounting I3 upon which an accessory table I2 may be conveniently supported, as shown in Figs. 2 and 3. I

The inner end of the frame II comprises the circular bearing mounting 15, the rim of which embraces the hub 54 in concentric relation thereto and serves to provide a substantially annular inner terminal structure encircling said hub 54:.

As best illustrated in Fig. 1, the table arm II! is supported for horizontal movement into different positions convenient to the operator, by the three supporting rollers 81 respectively mounted on the headed trunnionsv 90, which project inwardly from the bearing mounting l5.

The rollers that serve best to directly carry the weight of the projecting arm I and the parts supported thereon,consequently are disposed relatively close to each other upon opposite sides of a vertical plane passing through the axes of the annular ends of the accessory supporting arm frame, and roll upon the track 44, while the roller 'I'I which serves to balance the arm rolls -upon the opposed'superjacent track 60, and is preferably disposed with its axis of rotation substantially coincident with said vertical plane.

As shown in section in Fig. 1, the roller 11, which is typical of the three supporting rollers,

is annular in form and is provided with a ball race I8 in its inner cylindrical surface, in opposed relation to the ball race IS in the outward sur face of the ball race. annulus 85., and relatively revolves about said annulus on the bearing balls 8| which are arranged to traverse the opposed ball races 18 and I9.

' In order to retain the accessory table arm ID in axial registry with the supporting standard structure or pedestal, it is provided with the horizontally disposed equally spaced rollers 82 there being three such rollers arranged to traverse the cylindrical track 45, the roller 82, shown in the plane of section in Fig. 1, being disposed with its aXis of rotation in a vertical plane coincident with the axis of the supporting roller TI and journalled to rotate on the headed shaft 85 which, as shown in Fig. 1, extends through an aperture in the boss 86 onthe inwardly projecting rib 81 of thebearing mounting I5, and which is engaged in stationary relation therewith by the nut 89 threaded thereon.

Thus it will be seen that the accessory table arm I0 may freely revolve about the axis of the standard structure and be moved into any desired position convenient to the operator. However, it has been found desirable to adju'stably restrict its too free movement and to prevent its over running when its position is changed, and therefore a brake device is employed which, as shown. in 17, comprises the annular disk- 90 which is rotatably engaged between the water niche and cuspidor mounting section 3. and the accessory table arm section 4, and which is irictionallyengaged between the jaws ill and 92- of the brake device comprising the opposed jaw plates 93, and 9.4. respectively having the opposed lips or ridges 95 and 96 upon which they may slightly rock.

Said jaw plates are respectively provided with pockets 9 9 and I 00 in which friction pads HH- and I02 are held in opposed relation in frictional engagement with the upper and under sur faces of said disk 90 respectively, said pads IfiI nd I02 being engaged with said disk in ny desired degree. of yielding frictional contact with said disk 90, see Fig. 1'7, by the adjusting screw I03, which extends through the aperture I05 in the jaw plate 94 and into threaded engagement with the jaw plate 93. Said adjusting screw W3 is encircled by the spiral spring Hi6 disposed between its head I01 and. the jaw plate 94, and has the reduced end I09 extended into the aperture III] in the accessory table arm section 4, whereby it is retained and prevented from radial displacement in the pocket III in the cap ll of the water niche and cuspidor section 3.

The accessory table arm I0 is normally locked in engagement with said annular disk 95, so that it may be moved only by considerable manual pressure, the amount of which depending upon the frictional pressure of the friction pads I-lll and IE2 incident to the adjustment of said adjusting screw. I03, but said arm may be auto-.

matically released from such locked engagement to freely move about its axis of rotation.

As shown best in Figs. 2 and 3, the hollow spray bottle warmer supporting arm, 36, which is mounted to revolve about the axis of the accessory table I2 on the table mounting bearing -I3I, which is supported on the ledge I39 in the annular mounting I3 of the. accessory table arm "It, as shown in Fig. 3, said arm I and table I2 being arranged toindependently revolve upon the free end of said accessorytable arm, and jointly movable about the axis of the supporting standard or pedestal.

As shown in Figs. 2; 3 and 9, said water warmer supporting arm I316 is provided at its free end with the annular mounting I40 upon which the spray bottle and water tumbler warmer I ll is mounted to revolve. in Fig. 13 is provided with the receptacles I42, I43 and I44, respectively arranged to receive the removable and replaceable spray bottles I45 and M6 and the water tumbler I 4'I, shown in Fig. 9,

- the spray bottle illustrated in side elevation in Fig. 12 being typical of both of those shown in.

Fig, 9, and comprising the connection nipple M8, the swivel coupling M9 and the nozzle I50.

The body I51 of the spray bottle and water tumbler warmer MI is provided with the electric heating element I52 having .the terminals I53 and I56 and secured thereto-by the'screws I55, see Fig, 13. Said body is mounted upon the base frame I56 from whichi-t is insulated by the interposed diaphragm I51 of non-conducting material, and secured by the screws I66 extended through the lugs I58 of said base frame I56, said diaphragm I51; being independently attached to the lugs I59 of the body I5I by the screws I-6,I-.,

The spray bottle warmer body I5I:, as shown in Figs. 13; 15 and 16, is provided with the shell or casing I52 between which and said body the jacket I65 of heat insulating material, preferably insheet form, is interposed, and said shell or casing I62 extends downwardly and aiiords a depending apron. which also embraces the base frame I56.

The spray bottle warmer is arranged to independently revolve on its supporting arm"I3B which is provided at its outer free endwith the inwardly extending rim- IGG providing the bear ing seat I51 upon which the. centrally disposed generally circular spider, I69 of the base frame I56- rests for relative rotation, being held in axial; position, thereon by the annular retainer Iil'Il which rotatably bears. ag inst: the. under faceof' Said warmer I4I', as shown theinset rabbet I1I -in theinner edge of said rim I66, and said retainer I19 is secured to the frame spider I69 by the screws I12.

As shown in Figs. 13, 14 and 16, the base frame I56 is provided with the bottom closure supporting lugs I13 and I14 projecting inwardly and to which the bottom closure plates I15 and I16 may be secured by the screws I11 and I18 to enclose the chamber I19 included between said closure plates and said diaphragm I51, see Fig. 13.

The supply of electric current to the heating element I52 may be manually controlled to turn it on or off as may be desired, and it is also automatically controlled by thermostatically actuated mechanism to maintain a relatively uniform desired temperature.

Said electric current may be introduced into the spray bottle warmer by the electrical conductors I89 and I8I which lead from suitably provided connections and extend through the pedestal, accessory table arm and spray bottle arm I36, as shown in Figs. 14 and 16, and which extend spirally in the semicircular free end of said arm I36 and terminate at the terminals I82 and I83 in the terminal plates I84 and I85, on the terminal block of insulation material I86 which is secured to the spider frame I69 by the screws I81, see Fig. 14.

The electric circuit through the heating element I 52 may be made or broken by mechanism including the rocker post I86 which extends vertically through the diaphragm I51 and which is mounted to rock in the bearing bracket I89 which, as shown in Fig. 15, is secured to the under side of said diaphragm I51 and secured by the screws I99 extended therethrough.

Referring again to Fig. 15, the rocker post I36 is provided beneath the diaphragm with the spring contact finger I9I which carries the con tact I92 in opposed relation to the contact I93 mounted in stationary relation on the mounting bracket I94 also secured to the underside of said diaphragm I51 by the screw I95 extended therethrough, which mounting bracket I94 also carries the magnet I96 in opposed relation to the magnet keeper or bridge I91, which is carried by said contact finger I9I as above described.

With further reference to Fig. 15, the rocker post I88 is provided with thelever arm I98 which is connected by the link I99 to the outer end of the bimetallic thermostatic coiled spring or strip 299 which is limited in forward movement by the guide post 29I and is spirally coiled about the rock-shaft 292 journaled in the bearing bracket 293 secured to the underside of the diaphragm I51 by the screws 295.

Said rock-shaft 292, as shown in Fig. 16, carries at its lower end the hubbed disk 296 which is secured thereto by the screw 291, and which carries the rocker-arm or lever 299 having its inner circular end enlarged and encircling the hub of said disk 296 and secured thereto so as to move therewith by the screw 2I9. The outer circular end 2 I2 of said lever 299 is extended into the rectangular void or recess 2I3, best shown in Fig. 13, in the rack-bar 215, having the upwardly projecting rackpteeth 2I6.

With reference to Figs. 13, 15 and 16, the rackbar 2I5 is arranged to slide longitudinally on the shelf type supporting bracket 2" which is secured to the diaphragm I51 by the screws H9 and depends therefrom, as shown in Figs. 1 and 16. Said bracket 2I1 has its lower horizontal wing or shelf 229, see Fig. 15, provided with the longitudinally extending apertures 22I and 222 through which the shanks of the screws 223 and 225, threadedly engaged in said rackbar2I5, extend with their respective heads 226 and 221 underlying and loosely "engaging the under surface of said horizontal shelf 229 of the bracket 2H, and maintaining the rack-bar 2I5 in sliding contact with the upper surface of said wing or shelf 229.

The teeth 2I6 of the rack-bar 2I5 are interengaged with the teeth of the pinion 239 on the inner end of the shaft 23I which is mounted to rotate in the bearing 232 depending from the diaphragm I51 and secured thereto by the screws 233. Said shaft 23I extends rearwardly through the casing I62 and isprovided with the controlling knob 235 by which said shaft 23I may be rotated to shift the rackbar 2I5 and thereby rotate the rock-shaft 292 to wind or unwind the coiled thermometal strip 299. A pointer 236 arranged to move with said knob 235 indicates the position of the rack-bar 2I5.

Turning of the controlling knob 235 in a clockwise direction effects winding up of the coiled strip 299 which tends to draw the lever arm I98 and the contact spring finger I9I toward the right hand with respect to Fig. 15 and to effect breaking of the electric contact between the contacts I92 and I93. Turning of the controlling knob 235 in an anticlockwise direction eifects unwinding of the coiled strip 299 to produce movement of the contacts I92 and I93 together to complete the electric circuit therethrough to energize the heating element I52.

The coiled strip 299 is disposed in the chamber 239 with the heating element I52 and is arranged to automatically effect actuation of the lever arm I 98 and the spring contact finger I9I to separate the contacts I92 and I93 and thereby break the electric circuit in which the heating element is included when the temperature in said chamber 239 rises to a degree predetermined by the position of said rack-bar 2 I5 and variably controlled by the knob 235.

The terminal I53 of the heating element I52 may be connected through suitable wiring with the terminal 249 which connects through the contact finger I9I, contacts I92 andl93 with the terminal 24I of the terminal plate I84. The terminal I54 of said heating element I52 may be connected through suitable wiring with the terminal 243 of the terminal plate I85. As above upon the forward bar of the base frame I59 of the spray bottle warmer and is secured thereto by the screws 255 which extend upwardly through the countersunk apertures 256 in said base frame I56.

Said frame 252 supports the illuminator casing comprising the top wall 259, the bottom wall 269. both of which curvedly merge into the forward wall 262, and the end walls 263 and 265. Said forward wall 262 is provided with the window opening 266 which is surrounded by the window frame 261, the inner margin 269 of which overlaps said window opening 266, .and is secured to said forward wall by the screws 219.

As shown in Figs. 9, l and 11, the-window opening 266 is provided with the pane of. glass 212 which is retained in the window opening 266 by the brackets 21-3 disposed oppositely and substantially in alinement with the lower edge of said glass pane 212 and respectively extending from the end walls 263 and 265. and provided with the outwardly projecting lugs 216 extending beneath the glass pane 212 and. serving to support it, and the outwardly projecting lugs 21'! which extend over the lateral edges-of said glass pane to maintainit in proper registry with said window opening 266. 1 f

As shown in Fig. 10, the glass pane 212 is also retained by the brackets 279 similarly disposed oppositely in alinement with the upper edge thereof, said brackets 219 being similar to the brackets 213 and being provided with the outwardly projecting lugs 289 extending over the topedge of the glas pane 272 and the lugs 28I extending over the lateral edges of said glass pane As shown in Figs. 10 and 11, the brackets 213 and 219, which may preferably be secured by spot welding to the side walls 263 and 255 of the X-ray illuminator casing, are respectively provided with the spring clip 282, see Fig. ll,which are arranged to bear against the inner surface of the glass pane 212 to maintain it in the window open-' ing 266 in contact with the inner overlapping margin of the window frame 261. The lower bar of the window frame 26! has the upturned extension 233 providing a convenient support for holding a film before the glass pane 272. I ,7

As shown in Figs. 9, 10 and 11, the X-ray illuminator is provided with the reflector comprising the complementary concave reflective sections 285 and 286 respectively having oppositely directed outwardly extended flanges 289 and 290, andthe inwardly extended relatively parallelfianges 29! and 292. The flange 289 is engaged with the brackets 279 by the screws 293 and the flange 290 is secured to the brackets 213 bythe screws295, so that, as will be observed, the reflector comprising the complementary concave sections, forming -a reflector structure having a substantially tangential parabolic contour, brackets 213 and 219. U I I As best shown in Fig. 10, the flanges 29! and 292 of the reflector section are secured to the bar 296 of insulation material, preferably Bakelite by the screws 23'! to which bar the lamp supporting spring clip terminals 298 and 239 are attached by is supported by said the screws 300 and .3! which extend through' suitably provided apertures in said bar 236 in threaded engagement with the terminal plates 302 and 303 respectively.

The spring clip terminal 296 and 299 are conveniently spaced to receivethe terminal collars 305 and 306 of the tube type electric lamp 301 which is provided with a backing of refractory material and which is supported by said spring clip terminals 298 and 299 in such predetermined relation to the parabolic reflector surface as to direct relatively parallel light rays through the glass pane 212.

The terminal plates 302 and 303 are provided with the screw terminals 309 and 3I0, the terminal 309 being connected by the electric wire 3I2 with the terminal 3I3 on the terminal plate I05 in the base of the spray bottle warmer, and the terminal 3 I 0 being connected by the electric wire 3l5 with the terminal 3I6 on the terminal plate I 85 in the base of said spray bottle warmer. However, the wire 3l5 is connected through the rheostat switch 3.! 'Iwhichis arranged to be'actuated by the controlling knob 3I9. I 1

As shown inFig. '4, the .wires I and. I8l' are included in the electric cord 320 which enters the spray bottle warmer supporting arm I36 through the tubular elbow fitting guid 322, and curves forwardly toward the free end of said arm into a free return 10010323 from which it extends rearwardlyinto the loop 325 permanently restricted by the'clamp band 326, and from which loop 325 said cord 320 extends forward through the supporting and directing clip 32! from where it extends in the loop 323upwardly through the bushing 330 in the free circular end 33I of the bushing supporting bracket 332 into the base I56 of the spray bottle warmer where said wires I80'and I8I are attached to their respective terminals,see Fig. 14. i I v Referring againto Fig. 4, the electric cord 320 rests upon the floor 333 which has that portion which is disposed between the elbow fitting guide 322 and the loop 323 backed by the guide-335 formed ofa strip of sheet spring material that is secured in any manner, such as by the rivets 336, to the elbow fitting guides 322 :and extends curvedly forwardly therefrom, forming a backing for said electric cord 320 and tending to prevent buckling thereof, and terminating in a preferably circular loop 33l arranged to slide upon the inner surface of therear wall 339 of the spray bottle warmer arm I36. v i

With further reference to Fig. 4, it has been found desirable when the free end of the spray bottle. warmer arm I36'is moved forwardly from its normalposition with respect to. the accessory table arm I10 and the electric cord 320 has been relatively shifted to the position shown in dot and-dash lines in said figure, that the spring backing guide 335 be maintained flattened in its medial region, and for this reason the inwardly curved region of the rear wall 339 is providedlower end to provide a bearing 34'! for said elbow 322, and said restricted endportion is provided with screw threads 34.9 with which the nut 350 is threadedly engaged.

As illustrated in Fig. '7, the bracket 332, which is shown in perspectivev therein, has its inner end portion 352 slightly depressed and terminates in the enlarged circular attachment 353 having the aperture 355 through which the screw 356 extends, see Fig. 4, to engage it with the lug 35! extending inwardly from the forward wall 360 of the spray bottle warmer supporting arm I36. Said screw 356 also engages the clip 32'! which, as shown in Fig. 8, has the circular attachment 362 provided with the aperture 363 through which said screw extends to attach it in superposed relation to the attachment 353 of the bracket 332.

Referring to Fig. 4, it will be obvious that the spring backing strip 335 tends to maintain the electric cord 320 in such curved relation, irrespective of the position of the spray bottle warmer arm with respect to the accessory table supporting arm upon which it is arranged to revolve, and that when said electric cord 320 moves from its retracted position, shown in dot-and-dash lines, to its extended position, shown in full lines, it will be so reinforced and supported asto prevent its buckling or fouling, or otherwise tending to jam and interfere with the free movementof said spraybottle warmer arm.

My invention has many advantages over similar devices as heretofore constructed for supporting parts and accessories in convenient position for use by the professional operator, and affords not only easy access for use, but facilitates access for adjustment, repairs and replacement of all of said parts, and is particularly adapted for eliminating parts that may not be desired by individual operators and the substitution or addition of parts and accessories that may be desired, by other operators, and, in this particular respect, it is possessed of individual flexibility and consequent superiority.

I do not desire to limit my invention to the precise details of construction and arrangement as herein set forth,,as it is obvious that various modifications may be made therein without departing from the essential features of my invention as defined in the appended claims.

Having thus described my invention, I claim:

1. A dental equipment assemblage comprising a supporting standard, a relatively movable supporting frameproviding a radially extended arm arranged to swing about the axis of said standard as a center, an accessory table supported on said arm and arranged to independently rotate thereon, a secondary supporting arm mounted on the table supporting arm and movable horizontally about the axis of said table, an accessory device mounted for-independent rotation on the free end of said secondary arm, and including electrically energized elements connected with a source of electric energy by an electric conductor extending through said supporting arms and having a free loop and a cooperative restricted loop whereby to facilitate extension and retraction of said conductor, and a spring backing guide arranged to maintain said looped conductor properly posed.

2. An equipment assemblage comprising a mounting, a hollow supporting arm mounted on said mounting arranged to swing on a vertical axis and having a floor provided with an opening and marginal walls embracing said floor, a conductor entering said arm through its supported end region and leaving said arm at its free end region and including intermediate loops preferably resting on said floor and slidable thereon to afford extension and contraction incident to variation of the distances between the entrance and exit points of said conductor, and a spring backing guide arranged to maintain said conductor properly posed to prevent its fouling when said arm is swung on its mounting.

' 3. An equipment assemblage comprising a mounting, a hollow supporting arm mounted on said mounting arranged to swing on a vertical axis and having a floor provided with an opening and marginal walls embracing said floor and having an internal abutment; a conductor entering said arm through'its supported end region and leaving said arm at its free end region and includin intermediate loops preferably resting on said floor and slidable thereon to afiord extension and contraction incident to variation of the distance between the entrance and exit points of said conductor; and a spring backing guide limited in its movement by said abutment and arranged to maintain said conductor properly posed to prevent its fouling when said arm is swung on its mounting.

4. An equipment assemblage comprising a mounting, a hollow supporting arm mounted on said mounting arranged to swing on a vertical axi and having a floor provided with an openin and marginal walls embracing said floor, a conductor entering said arm through its supported end region and leaving said arm at its free end region, and including intermediate loops preferably resting on said floor and slidable thereon to afford extension and contraction incident to variation of the distance between the entrance and exit points of said conductor; and a spring backing guide provided with a curved bight serving as a slide shoe, arranged to maintain said conductor properly posed to prevent its fouling when said arm is swung on its mounting.

5. An equipment assemblage comprising a mounting, a hollow supporting arm mounted on said mounting arranged to swing on a vertical axis and having a floor provided with an opening and marginal walls embracing said floor; a conductor entering said arm through its supported end region and leaving said arm at its free end region and including intermediate loops preferably resting on said floor and slidable thereon to afiord extension and contraction incident to variation of the distance between the entrance and exit points of said conductor; and a-spring backing guide anchored at its inner end and provided with a curved bight at its free end serving as a slide shoe arranged to maintain said conductor properly posed to prevent its fouling When said arm is swung on its mounting.

ROBERT C. ANGELL.

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