| 摘要 |
PROBLEM TO BE SOLVED: To provide a burglarproof thumb-turn capable of preventing the unauthorized unlocking of a thumb-turn knob, by hanging or pushing inserted wire and bar or the like to the knob. SOLUTION: The burglarproof thumb-turn 100 is provided with a fixed cylinder 21, which is installed to a door and in which an engaging recessed section 37 is formed to the inner peripheral surface; a thumb-turn shaft 45, which is internalized to the fixed cylinder 21 and in which one end is connected to a lock box; and a guide groove 61 formed to the end face of the shaft 45 in the diametral direction; a pair of stoppers 63 and 63 being housed in the guide groove 61, being forward moved into the engaging recessed section 37 and preventing the rotation of the thumb-turn shaft 45; a pair of wing-shaped knobs 81 and 81, which are exposed to the indoor side and divided into two, in which turning shafts 83 are fixed to each of the knobs and which are supported to end faces via the turning shafts 83, and a pair of pushing arms 85 and 85, which are fixed at the front ends of each turning shaft 83 and in which the extended front end sections 85a and 85a are held mutually between a pair of the mutual stoppers 63 and 63. COPYRIGHT: (C)2005,JPO&NCIPI
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