Patent ID: 8575524

Claim:
Heating plate ( 12 ) for workpieces, comprising a heatable body ( 130 ) which on a first side has a contact surface ( 15 ) for the respective workpiece, comprising at least one heating channel ( 135 ) filled with a heating fluid for heating the heatable body ( 130 ), which heating channel ( 135 ) is formed in or on the heatable body ( 130 ) opposite the contact surface ( 15 ), and comprising heating means ( 35 ) for heating the heating fluid, wherein a channel wall ( 135 . 1 ) of the at least one heating channel ( 135 ) is configured to be inductively heated and the heating means ( 35 ) comprise at least one heating device ( 35 . 1 ) for inductively heating the respective channel wall ( 135 . 1 ), the respective heating device ( 35 . 1 ) being arranged outside the at least one heating channel ( 135 ) and the heating fluid in the at least one heating channel being able to be heated by a transfer of heat to be generated by means of the heating device ( 35 . 1 ) in the respective channel wall ( 135 . 1 ), the heatable body ( 130 ) comprising a plurality of bores ( 132 ) which are respectively configured to be continuous between two opposing front faces ( 131 . 1 , 131 . 2 ) of the heatable body ( 130 ), the respective bores ( 132 ) respectively forming a portion of the at least one heating channel ( 135 ) and being connected to one another via connecting channels ( 140 , 146 ) that are continuous for the heating fluid, each of the connecting channels ( 140 , 146 ) connecting two of the bores ( 132 ) respectively at their ends at one of the two opposing front faces ( 131 . 1 , 131 . 2 ), such that all bores ( 132 ) and all connecting channels ( 140 , 146 ) respectively at their ends are connected in series to one another and accordingly respectively form different longitudinal portions of the at least one heating channel ( 135 ), the respective channel wall ( 135 . 1 ) being formed from regions of the heatable body ( 130 ) which on a side of the heatable body ( 130 ) remote from the contact surface ( 15 ) is adjacent to the respective bores ( 132 ), and at least one of the respective connecting channels ( 140 ) being arranged on one of the respective front faces ( 131 . 1 , 131 . 2 ) of the heatable body ( 130 ) and being implemented in the form of a recess ( 141 ) formed in the heatable body ( 130 ), which opens into at least two of the respective bores ( 132 ), on one of the respective front faces ( 131 . 1 , 131 . 2 ) a cover element ( 142 ) being arranged, which covers the recess ( 141 ) and the respective bores ( 132 ) into which the recess ( 141 ) opens.