Patent GB-312143-A (GB)
IPC: A61C19/00
Filed: 1928-09-21
Abstract: 312,143. White Dental Manufacturing Co., S. S., (Assignees of Angell, R. C.). May 21, 1928, [Convention date]. Stands, trays, and the like; optical instruments; air douches. - In a dental accessory supporting-device each instrument is carried by a conductor which is spirally coiled on a. carrier which is rotated against spring pressure, when the instrument is withdrawn for use and is automatically reversed to retract the instrument after use. The bracket table 1 is mounted on an arm 2 jointed to the main arm 3 which is in turn pivoted on the distributing head 4 carried by a standard 5 projecting from a pedestal 6 which houses the supply leads for water, gas, air and electric current. The pedestal 6 also supports the spittoon 7, the frame, 8 of which carries the controlling valves 9. The head 4 supports the dental engine 12 including a motor 13 and lamp holder 16. A closure plate 17 provides access to the supply connections. The arm 3 swings about a vertical post 14, Fig. 2, secured in the head 4 and carrying the supply wires 20, 23 for the motor 13. The leading-in wires 27, 28 are also connected through plates 25, 26 to the lampholder 16. Within the head 4 is located a unit 33 which connects the gas-supply pipe 37 to the tube 38 and also connects the air-supply pipe 41 to the tube 42 leading to the bracket table. An air filter is provided at 43. The main arm 3 terminates in a cup 51 provided with a seating 52 engaged by a flange 56 on the forearm 2, this flange being retained by a member 57 which is adjustable by a plate 61 to vary the friction between the arms 2, 3. The forearm is provided with buffers to limit its oscillatory movement on the main arm. An annulus 66 at the end of the forearm provides a seating which permits angular movement of the accessory table 1. The conduit for the electric supply wires 31, 3 passes through a short tube 81 which is concentric with the table axis and which serves as a guide about which the gas and air tubes 38 and 42 are loosely coiled. The instrument controlling mechanisms are housed in the hollow interior of the table 1 between upper and lower annular plates 83, 82 connected by posts 85, and closed by a number of housing plates 89 - - 93. A switchboard panel 94 is provided on the forward side of the table. The housing plates 89 - - 92 are attached to the annular plates 82, 83 by spring yokes 101 and the hollow table structure has recesses 109, 110 which are ,formed in the plates 89, 93 adjacent the switchboard panel, and which provide space in which tools or instruments may be disposed when not in use. A semi-annular closure plate 95 is secured to semi-circular slide strips 116, 117, which are fitted in the upper and lower plates 83, 82 respectively so that the closure 95 may be guided circularly round the body of the table to afford protection when necessary to the switchboard panel 94 and to implements disposed in the recesses 109, 110. The closure is manipulated by a handle 122, Fig. 5, coacting with a latching device. A number of annular supporting plates, 129 - - 132 having upwardly extending central flanges are supported within the table housing by means of spacing sleeves located over the posts 85. These plates carry a number of rotatable annular trays 255 - - 158 having peripheral flanges engaged with grooved pulleys 163 - - 166. 'The trays are carried by rollers mounted on studs projecting upwardly from the supporting plates, three rollers being preferably provided for each tray. The flanges of the supporting plates form a well which accommodates controlling devices comprising a transformer 192 for low-voltage instruments, a switch 193, a regulating switch 195 for the low voltage current, and air pressure regulating valves 196, 197. The transformer supports a terminal connecting plate 212 for the low voltage connections, and an extension of this plate supports the switches 193, 195. The pressureregulating valves 196, 197 are carried by a connecting bar 259 connected to the flexible tubing 42. The valve 196 is connected with a fitting 289 mounted on the supporting plate 131 and the valve 197 is connected with a fitting 299 mounted on the plate 129. The fitting 299 is connected to a flexible pipe 300 which is loosely coiled on the floor of the tray 155, and is connected at its other end through a connector 302 removably secured to the tray, to a flexible extension tube 310 which passes round a pulley and a sheave and terminates in the handle 316 of the air nozzle 317. When the air nozzle is extended to an operative position the tray 155 is rotated to tighten the coils thereon around the flange 133. The reverse rotation of the tray to retract the air nozzle is effected by a spring 319. This reverse rotation may be prevented and the tray held in any desired position while the air nozzle 317 is being used by means of a locking block, secured to the supporting plate 129 and co-operating with a roller 346 which jams against edge of the tray and prevents retractive movement. The brake holder may be released when desired to permit retraction of the tube 310 by means of a trip lever 350 which may be actuated either from a handle 355 or by drawing the tubing 310 outwards to the full limit of its movement. The fitting 289 is connected to a flexible tube 365 which is loosely coiled on the floor of the tray 157 and is connected through a member 366 to an extension 367 which passes round the pulley 165 and then round a block 370 to an instrument holder 371 terminating in the handle of the warm air syringe 372. This fitting may be drawn out for operative purposes in a manner similar to that above described in connection with the air nozzle and is similarly retracted by a spring 373. The warm air syringe embodies an electrical heating element and the flexible tubing has conducting wires 377 - - 380 extending therethrough which terminate at the inner ends of the wires 379, 380 in the fitting 289, Fig. 39, which is connected through wires 390, 506 to terminals on the plate 212 of the transformer. The wires 379, 380 are connected at their opposite ends to the wires 377, 378 through the connector shown in Fig. 41, which is arranged so that the connection between the tubing 365 and the tubing 367 together with the electrical leads therein, may be severed by relative rotation of nipples 509, 510 to separate the threaded portions 522, 525. The tightening of this threaded connection serves to draw flanges 512, 513, against a spacing sleeve 517 to connect electrically the wires 377 and 379, and wires 378, 379, and to establish an air-tight joint between the air tubes. The mechanism for locking and releasing the tray 157 is similar to that provided for the tray 155. The uppermost unit comprising the annular plate. 132 and tray 158 carries the hot plastic instrument 529 having a handle 530. This instrument is connected by a flexible extension cord 535 including electrical leads 536 and 537 to a terminal block 559 connected through a further flexible cord 539 to the terminal plate 212. The block 559 is secured on the tray 158 and the extension cord passes round the rim 166 of the tray and round a sheave 565 to the instrument handle 530, and the instrument is drawn out when required for use and automatically spring-returned in a manner similar to that described above. The tray 156 carries a unit provided with a mouth or antrumlamp 583, the handle of which is engaged in a holder 585 and is connected through a coiled flexible conductor 587 to the transformer in a manner similar to that described in connection with the instrument 529. The extension cord 586 passes round the sheave 588 and rim 164 and has a spiral spring 589 interposed between its coils to effect the return movement of the lamp 583. Each tray is provided with a cover plate 590 having locking engagement with the upturned flanges on the respective trays. The upper plate 83 of the table structure is closed by a pan 712 which carries on resilient pads a glass service tray 715. The pan may also carry a bracket 720 of the instrument holder 721. The housing plate 90 is provided, with a push button 724 that may be connected to a call signal. A plug receptacle 725 depending from the baseplate 82 affords attachment for auxiliary devices employing a line voltage, the plug being connected through the terminal block 34 to the electrical leads 31, 32. The spray bottle warmer 750, Fig. 49, located at the side of the table includes spray bottles 751 and 752 and a tumbler 753, the holder 755 being connected to the base plate 82 which carries a terminal block connected to the mains 31, 32 and to the lead-in wires 772. A wiring diagram showing the electrical connections of the various adjuncts is included in the Specification. A gas burner is provided at 700, Fig. 45.