GB587361A - Improvements in or relating to apparatus for heating by high frequency electric currents - Google Patents

Abstract

587,361. Dielectric heating. STANDARD TELEPHONES & CABLES, Ltd., and MADDOCK, A. J. Aug. 18, 1944, No. 15814. [Class 39 (iii)] In a high frequency dielectric heating apparatus, one or both electrodes 6, 11 are mechanically connected with a door 2 of metal screening cage 1 so that when the door is opened the electrodes are separated to facilitate removal &c. of the heated material. The cage may be of perforated or mesh material to allow gases &c. to escape and the material to be observed. In one example, Fig. 1, the upper electrode 11 is carried by arms 12 pivoted at 13 and connected through an arm 14 and link 15 to the door 2 hinged at 3. The electrode 11 is automatically moved to position 11a when the door is closed, a balance weight 5 maintaining the door in either open or closed position as desired. The lower electrode 6 is vertically adjustable in slots 9 in supports 10. In a modification, Fig. 2 (not shown), particularly suitable for electrodes of large area, the door and upper electrode are vertically slidable, being connected through a chain and cam mechanism so that opening of the door raises the electrode. The chain is attached at one end to the door and at the other to a balance weight, and passes over sprocket wheels, one of which has its axis' fixed to the cam. The cam is spiral shaped and engages a roller adjustably connected to vertical rods which support the upper electrode, so that the working distance between the electrodes can be altered from outside the screening cage. According to the Provisional Specification one electrode may also be connected to the vertically moving door by a rack and pinion device or by means of levers.