| 摘要 |
A door lock (28) for fire-retarding doors, with a keyhole (31) and with matched door plates (17, 25), is to guarantee a good safeguard against flame penetration, even in respect of keyholes with a relatively large passage cross-section, especially in respect of snapped keybits, continuous keyholes or even profiled lock cylinders made of plastic. For this purpose, the door lock (28) possesses, for covering the keyhole (31), a respective pivoting plate (22) which is articulated above the keyhole (31) on a sheet-steel baseplate (17) and which is held in its upwardly directed basic position by the border edge (26) of an associated slip-over plate (25) consisting of burnable plastic. <IMAGE>
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