Patent GB-958686-A (GB)
Title: Improvements in or relating to dental units
IPC: A61C19/00
Filed: 1960-10-21
Abstract: 958,686. Dental instrument tables. SIEMENS-REINIGER-WERKE A.G. Oct. 21, 1960 [Oct. 29, 1959; March 5, 1960], No. 36203/60. Heading A5R. A rectangular dental instrument table T with means 32 for detachably mounting dental handpieces is supported on a stand G by guide members on the table and the stand, the guide members comprising a horizontal circular track on which the table is rotatable about a vertical axis and a longitudinal track or tracks for sliding the table rectilinearly in a horizontal direction. The stand G has a base 1 with an extension 2 at the end of which is a lever 3 controlling the supply of pressure medium and electric current. One half of the table has guides 11 which slidably engage counterguides 10 in a head 9 rotatably mounted on the stand so that the table is horizontally slidable longitudinally and rotationally relative to the stand. Locking means for preventing movement of the table relative to the stand are provided. The table carries dental instruments 21-24, a drawer 29 and a film viewer F. The dental instruments are connected to pressure medium conduits or electric leads which are guided by pulleys (Fig. 4 not shown) through the instrument table, the head and the stand, and which are loaded by weights so that they may be pulled away from the table in use. The interior of the table has mechanism for orientating the dental handpiece carrier arm and the dental instruments into the most suitable position for use in dependence upon the position of the table relative to the stand. In another construction (Fig. 8), the mechanism for orientating the handpiece carrier arm 52 comprises a cord 71, which passes over pulleys 64, 67 fixed relative to the stand and is secured between an end of the table 60 and one arm 75 of an angle lever pivotal in the table, so that it pivots the arm 75 against a spring 76 in accordance with the rotation of the table on a circular track 58 formed in a cylindrical extension 57 of the stand. The other arm 79 of the angle lever then pivots to rotate a lever 83 about the axis of the handpiece carrier arm and thus orientate the carrier arm in dependence upon the movement of the table. A cord 70 extends over pulleys 63, 65 between one end of the table and a pivotal lever 89 so that rotation of the table pivots the lever 89 against a spring 94 and moves a lever 98 carrying a roller 100 which contacts cam surfaces 101 or 102 on the inside of a pivotal shelf 103 carrying dental instruments 104-106. The shelf is normally urged into the table by a spring 114 so that the cam surfaces are pressed against the roller. If the table is moved so that the shelf approaches the user, the lever 98 moves the roller 100 counterclockwise along one cam surface 101 and the shelf remains stationary with the instruments projecting beyond the side of the table. If the table is pushed so that the instruments recede from the user, the roller 100 is moved clockwise so that it rides on to the other cam surface 102 so that the shelf is urged by a spring 114 inwardly of the table and the instruments move into the interior of the table. An electromagnetic device 123 energized on release of a handle 121 resists unintentional movement of the table relative to the stand.