Patent Publication Number: US-2010107706-A1

Title: Door locks

Description:
TECHNICAL FIELD  
     This invention is in regards to door locks and a system with functions that prevents coercive unlocking trough non-electric powered blocking of rotation and reduces possibilities of equal key presence. 
     To elaborate in detail, this invention features three to fivefold safety functions such as twisted shapes and bolted deadlocks; also, in this plug structure one or more inner keys can be added to the conventional plug structure so that unlocking is only possible when the upper surface (head) of the key presses the designated upper surface of the inner key, and with this inner key structure the probability of equal key presence is reduced even when the key size is unchanged. 
     Therefore, this invention is for utilization in simple structures such as cylinder door locks, lever-type door locks, analog keys of digital door locks, and for utilization on emergency analog keys for car door locks with no-key structures; analog keys are essential as emergency keys for digital door locks as they show fragility on static electricity, magnetic fields, surges, and heat in case of fire. 
     BACKGROUND ART  
     Existing door locks consist of a cylinder, a plug which is equipped inside the cylinder, a number of pins inserted in the plug, and a key which aligns the pins. It is important that the pins do not be easily aligned with a device other than the key, but at the same time durable to coercive attempts for rotation. However, due to a simple structure, unlocking is possible with plain implements or a universal key, not to mention problems with coercive rotation. 
     Such problems are related to virtually all analog type door locks, including cylinder/lever type door handle locks, deadlocks, analog emergency keys for digital door locks, and automobile door locks. 
     DISCLOSURE OF INVENTION  
     Objectives of this invention is to develop a structure which unlocks only when the upper section of the key presses a corresponding inner key; a bolted deadlock structure which prevents coercive rotation without specific electric power sources; develop an interlocked rotation-preventing structure which blocks rotation without specific electric power sources; develop an equal sized-key with reduced probability of an equal key; develop a cylinder, plug and pin structure which can be implemented in simple cylinder lever type door locks as well as analog key &amp; lock system for costly multifunctional digital door locks and car door locks suitable for no-key structures with highly complicated structures for unlock prevention; and to develop door locks with three to fivefold safety locking abilities with a torque share section that detaches in case of forced destruction. 
     This invention is able to realize the abovementioned objectives with configuration of cylinders, plugs, pins (top &amp; bottom pins) and additional configuration of rotation-preventing methods as well as methods to reduce equal key presence probabilities. 
     Therefore, Configuration 1 of this invention is one from ordinary door locks which has a rotating plug ( 4 ) with a keyhole, and ( 42 ) a turning axis ( 46 ) at the bottom; numerous pins ( 92 ,  91 ) are inserted through the cylinder ( 3 ) and plug ( 4 ). When a key ( 100 ) is inserted into the abovementioned keyhole ( 42 ), the waving curve or groove ( 103 ) of the key aligns the edges of the upper &amp; lower pins ( 92 ,  91 ) with the inner surface cylinder ( 3 ) and the plug ( 4 ); under such a condition will the plug ( 4 ) and the turning axis ( 46 ) rotate (right/left) for locking and unlocking. In the case of this ordinary door lock configuration, two or more lock plate holes ( 410 ) will be made on the bottom of the plug with an extended keyhole ( 42 ) to form a plug ( 4 ) that corresponds to the lock plate holes. The cylinder will have holes ( 32 ) corresponding to the conventional lower pins ( 91 ) and a number of holes ( 320 ) corresponding to the number of lock plates, to which the lower section of the lock plate ( 720 ) is inserted. The lock plate ( 700 ;  FIG. 10A ) holds hitches ( 780 ,  790 ) and a center hole ( 740 ) for inserting bullet-shaped inclines or a flat key. The key ( 100 ) is to be either a flat key with a front surface ( 109 ) and incline ( 108 ) or a bullet-shaped key, or one with flat surfaces ( 106 ) in between planes ( 108 ). The lock plate is to be inserted into the lock plate hole ( 410 ) and the plug ( 4 ) is assembled with the cylinder ( 3 ); in the cylinder pin holes ( 32 ) the lower pins ( 91 ) and springs ( 9 ) will be inserted to press the upper section of the lock plates ( 710 ) so that the lower section ( 720 ) is inserted as far as the hitch in the hole ( 320 ). When the key is inserted into this structure, the incline ( 108 ) and each lock plate center holes ( 740 ) will have each lock plates to push the lower pins ( 91 ), thus each lower section ( 720 ) is pulled out of the holes ( 320 ) in the flat surface ( 106 ); this means that the outer surface of the plug is exactly the same as the alignment of the pins, thus enabling the key to rotate or rotate after a push. Therefore, the abovementioned lock plates can be a method of preventing coercive rotation, and an implementation (refer to lock plates ( 700 ;  FIG. 6 ) and keys ( 100 ;  FIG. 9A )) of technical objectives of this invention. Here, lock plates ( 700 ) could be substituted with upper pins ( 92 ). 
     In Configuration 2 ( FIG. 4 ), lock plates ( 700 ) have protrusions at bottom side ( 735 ;  FIG. 10G ) and in the lower part of the abovementioned lock plates is a protruded shape ( 45 ) with a staircase surface ( 440 ). In the inside of the lower section of the cylinder, there is a groove ( 38 ) with an interval ( 39 ) holding a hitch ( 31 ) that is to have the staircase surface ( 440 ) of the abovementioned protrusion locked into. When necessary, springs ( 7 ) can be inserted to the exact position where the plug ( 4 ) is rotated as far as the interval to evade the groove ( 38 ) so that the spring can pull or push the plug. The stopper/hitch ( 6 ) is to be fixed. When the key is inserted, the upper part of the lock plates will rise, unraveling the protrusion at bottom side ( 735 ); rotation is enable only to the extent of the intervals, and the staircase surface will lock onto the hitch ( 31 ). When the key is pulled, the protrusion at bottom side ( 735 ) of the lock plates will be locked onto the intervals, thus preventing any rotation to a higher extent. In other words, the abovementioned staircase surface ( 440 ) is added to Configuration 1 to form even a stronger method of preventing coercive rotation. Here, prevention of coercive rotation can be implemented through the following: the staircase protrusion can be twisted; a screw bolt ( 442 ;  FIG. 5A ) can be used; a nut can be locked/unlocked to the above bolt in case of advancing or pulling movement ( FIG. 5B ) within the cylinder. Here, an absorption axle can be used to keep the axle from moving forward/backwards in the plug ( FIG. 5C ). Also, a torque share section ( 490 ) can be added to the lower border surface of the plug, staircase protrusion, twisted protrusion, and the screwed protrusion; it is to be separated in case of coercive rotation, and even when damaged, the spring ( 7 ) will keep the protrusions from separation. High-intensity pins can be inserted in the protrusions when necessary to implement technical objectives of this invention. 
     Configuration 3 has on the lower section of the plug an extended keyhole ( 422 ) into which one or more inner keys are separately inserted. The plug ( 4 ) has on its side pin holes ( 418 ,  428 , etc) upper pin holes ( 47 ), and spring holes ( 417 ,  427 , etc). As shown in  FIG. 7D , geometrical top surface ( 214 ,  224 , etc), the upper section ( 211 ,  221 , etc) or the side can have horizontal grooves ( 218 ,  228 , etc) and waving curves or grooves ( 219 ,  229 , etc) underneath them, and the lower section ( 212 ,  222 , etc) even beneath to form inner keys ( 210 ,  220 , etc). The cylinder will have a lower pin hole ( 32 ) on the location of the upper pin hole ( 47 ) of the plug; abovementioned lower section ( 212 ,  222 , etc) of the inner key forms an extended keyhole ( 422 ;  FIG. 8D ). Springs ( 707 ) are inserted into each lower section ( 212 ,  222 , etc) and pins ( 1 ) are pierced through pin holes ( 418 ,  428 , etc); they are fixed as inserted in the horizontal grooves ( 218 ,  228 . etc) to form a single plug ( FIG. 12A ). Then the plug ( 4 ) is inserted into the cylinder ( 3 ) and assembled by pressing them together with upper and lower pins ( 92 ,  91 ) and a small spring ( 9 ) pushed into each pin hole ( 32 ,  47 ). When the key ( 100 ;  FIG. 9B ,  9 C) is inserted, the geometrical shape of the key front or incline ( 108 ) or even the geometrical shape of the groove ( 104 ) of the space between inclines can press the waving curve or grooves ( 219 ,  229 , etc) of the inner key to align upper and lower pins and thus allowing the key to turn. The axle ( 46 ), which is a single attached piece with the plug ( 4 ), is separated so as to form a plug and axle ( 20 ;  46 ); the axle hole and inner key holes ( 422 ) are at a single space ( FIG. 12B ). In the upper section of the inner key, horizontal grooves are rid of ( FIG. 7F ) and the lower section ( 212 ,  222 , etc) can be changed into protrusions ( FIG. 7H ); the inner key are inserted into each inner key holes. Springs ( 707 ) are inserted into each lower section and a spring stopper plate ( 775 ;  FIG. 7J ) is used to fix the inner key on the bottom of the plug. The plug has the axle inserted and fixed into the axle hole ( 48 ), and the hole for upper sections of inner keys ( 40 ;  422 ) are located on the position of the incline ( 108 ) and geometrical grooves ( 104 ;  FIG. 9B ,  9 C) of the key. The upper section of the inner key ( 211 ,  221 , etc) forms a   shape, forming an angle with the upper pin holes ( 47 ) of the plug ( FIG. 7H ). As for the plug, the inner key is inserted into the inner key hole ( 776 ) of the insertion plate ( 775 ), on the top of each waving curve of groove ( 219 ,  229 , etc). The key has configurations ( FIG. 9B ,  9 C) which have geometrical grooves ( 104 ) between inclines ( 108 ); this key structure and inner key designs in  FIG. 8A ,  8 B,  8 C,  8 E,  8 F are included in this invention. Also, a structure formed through combination of Configurations 2 and 3 are also included in this invention. In this structure, the inner key can be a method to reduce the probability of equal keys, thus implementing a technical objective of this invention. Configuration 1 is the simplest configuration and Configuration 3 is the high-functionality structure. Configuration 2 is the medium of the two configurations, and can be utilized as deadlock keys and emergency analog keys for digital door locks. 
     Configuration 4 is Door locks that turns and unlocks when the key ( 100 ) is inserted into the keyhole ( 42 ) and plate pins ( 8 A) inserted into the side holes ( 49 ) of the plug are aligned at grooves or holes ( 330 ,  340 ). Compositions are the cylinder ( 3 ), plug, and a stopper/hitch ( 6 ) that is tightened to the axle ( 46 ). There is a protruded shape ( 45 ) on either the upper section ( 41 ) or the bottom of the plug ( FIG. 2 ) and the axle ( 46 ) is in one piece with the plug. As for the cylinder, it holds an engraved groove ( 333 ) which is to fit with the twisted protrusion. A spring ( 7 ) can be inserted into the axle ( 46 ) push or pull the plug. A stopper/hitch ( 6 ) for fixation is located on the position where the twisted protrusion is unraveled from the engraved groove. The twisted shape or twisted gear ( 441 ) protrusion refers to a geometrical protrusion such as rectangle, square, pentagon, and eclipse shapes twisted to a certain extent; also, an engraved groove can be made on the cylinder to fit this twisted protrusion. A torque share section ( 490 ) can be added between the twist and bottom of the plug, and here the twisted protrusion works as a method to prevent coercive rotation or turning, thus implementing the technical objectives of this invention. Such a structure is adequate for cylinder type and lever type door handle locks. 
     In Configuration 5, plate pins and the key are different from Configuration 1. This configuration especially has plate pins adequate for car door locks; when the key is a flat key ( FIG. 9A ), plate pins ( 700 ) function as lock plates ( FIG. 10D ), when the key is an engraved key ( FIG. 9H ,  14 A), plate pins ( 700 ) function as lock plates ( FIG. 10E ), and when the key is an embossed key ( FIG. 91 ,  13 ), plate pins function as lock plates ( FIG. 10F ). When the key is an embossed/engraved key ( FIG. 9J ,  14 ), embossed/engraved plate pins can be used as lock plates. Also, plate pins can be separated plate pins ( FIG. 13E ,  13 F), separated plate pins ( 14 B), and separated plate pins ( 15 A,  15 B,  15 C), thus reducing the probability of equal keys. Also, usage of the upper section and incline of various keys and direct/indirect alignment of plate pins (separate plate pins) also provide a solution for the technical objective of this invention. 
     Configuration 6 is similar to Configuration 2 but has additional twisted gear or twisted protrusions; this method of preventing coercive rotation is even stronger than in Configuration 5. 
     Configuration 7, unlike Configuration 3 which has an inner key added to the conventional deadlock door lock, has an additional inner key adequate for car door locks as a means of reducing equal key probabilities. In detail, the door lock consists of a cylinder ( 3 ), a plug ( 4 ) installed into the cylinder, and a stopper/hitch ( 6 ) that is tightened to the axle ( 46 ) that sticks out of the cylinder. The key ( 100 ) is inserted into the plug keyhole ( 42 ), thus aligning numerous plate pins ( 8 A) or pairs of separate plate pins ( 8 B,  8 C) at the horizontal groove or hole ( 330 ,  340 ) of the cylinder. In this door lock structure, one or more inner keys ( FIG. 7A ,  7 D) are placed to protrude from the bottom of the keyhole as shown in  FIG. 12A , and they are used as a means of reducing equal key probabilities, as they each have to be pressed by the front section and inclines (refer to Configuration 9) in order to unlock. Also, as shown in  FIG. 12B , one or more inner keys ( FIG. 7F ,  7 G) are placed to protrude from the bottom of the keyhole, thus also working as a means of reducing equal key probability. As for the plug, there are a number of inner keys ( 210 ,  220 , . . . ,  290 , etc;  FIG. 7K ,  7 L,  7 M,  7 N,  7 O,  7 P) and the insertion hole ( 40 ) of the plug corresponds exactly to each inner key in terms of location, number and surfaces. The plug also has insertion holes ( 49 ) for plate pins, in some cases separated, which are pressed by the waving groove of the inner keys. A spring stopper plate ( 775 ;  FIG. 7J ) holds the separated plate pins (single-layer) and the rest of the inner keys, passing through the inner key insertion hole ( 776 ) at the abovementioned spring stopper plate, is inserted into the insertion hole ( 40 ) of the plug, pressed and held by the spring stopper plate (multiple-layer); an axle ( 46 ) is inserted through the axle hole ( 48 ) to hold the plug together. Therefore, this configuration uses a number of inner keys to minimize the probability of equal keys, thus implementing technical objectives of this invention. 
     Configuration 8 ( FIG. 6 ,  11 A) has a stopper/groove ( 414 ) on the upper section ( 41 ), protruded shape ( 45 ) or the axle ( 46 ) of the plug. The cylinder ( 3 ) has a hole ( 314 ) at a corresponding position as the stopper/groove ( 414 ) of the plug. There is also a pin hole ( 32 ) for inserting the lower section ( 12 ) of the pin ( 10 ) into the groove ( 340 ) where lower protrusions ( 87 ) of plate pins are hooked. In the case when there is a stopper/groove at the upper section ( 41 ) of the plug, there should be a protrusion ( 316 ) with pin holes ( 315 ) at the top. When there is a stopper on the protrusion or axle ( FIG. 11C ), the cylinder should have a protrusion ( 316 ) in between pin holes ( 32 ) and front of the plug. There is a lever ( 800 ) which consists of a shaped upper section ( 810 ) and lower section ( 820 ) with pin holes ( 850 ). The pin consisting of an upper section ( 11 ), stopper ring ( 13 ) and the lower section ( 12 ) is inserted into the pin hole ( 32 ) to meet the lower protrusion ( 87 ) of the plate pin. The upper section ( 810 ) of the lever is inserted into the hole ( 314 ) all the way to the stopper/groove ( 414 ) and the center section ( 830 ) of the lever, while pressing the upper section ( 11 ) of the pin, combining the pin hole of the stopper and pin hole ( 850 ) at the lower section ( 820 ) and the spring ( 787 ). In such a structure, when the key is inserted, inclines ( 117 ,  127  or  108 ) pull the lower protrusions ( 87 ) of the plate pins out of the groove or hole ( 330 ), thus aligning the plate pins with the outer border surface of the plug. At the same time, the lower protrusions ( 87 ) of the plate pins push the lower section ( 12 ) of the pin to make the upper section ( 11 ) of the pin lift the center section ( 830 ), thus pulling the upper section ( 810 ) of the lever out from the stopper/groove ( 414 ). This acts as a prevention device for rotation; the lever ( 800 ) is a bolted deadlock which can prevent coercive rotation without specific electric power sources, thus implementing a technical objective of this invention. 
     Since coercive rotation preventing methods of Configurations 1, 2, 5, 6, 8 does not have much use as a means to minimize equal key probabilities, Configuration 9 is a configuration where inner keys of Configurations 3 and 7 are increased to reduce equal key probabilities. In order to increase this inner key combination, the key holds one or more geometrical grooves ( 104 ,  1104 ) in between inclines ( 108 ), the front surface ( 109 ,  119 ,  129 ,  139 ), or the vertical side of the front surface ( 139 ;  FIG. 9B ,  9 C,  9 E,  9 G,  9 I,  9 J). Another combination is to make one or more flat surfaces ( 106 ,  116 ,  126 ,  1106 ) or geometrical waving curve or grooves ( 103 ,  113 ,  123 ,  1103 ) on the inclines ( 107 ,  108 ,  117 ,  118 ,  127 ,  128 ,  1107 ) of a normal key or M-type key ( FIG. 9H ). For details refer to  FIGS. 9G ,  9 I and  9 J. Therefore, the number of plate pins or separated plate pins on the side of the plug is increased, which allows selective utilization of geometrical grooves ( 104 ,  1104 ) to press the inner keys, front surface ( 109 ,  119 ,  129 ) of the key, flat surfaces ( 106 ,  116 ,  126 ), waving sides, and waving curves or grooves ( 103 ,  113 ,  123 ,  1103 ); this maximizes the number of pins, reducing the probability of equal keys even more to implement a technical objectives of this invention 
     In sum, the key from this invention can be added to Configurations 1-8 to maximize prevention of coercive rotation and reduction of equal key probabilities. Such a structure can be applied as follows: Configurations 1-3 on deadlocks/digital door locks, Configuration 4 on cylinder type and lever type door handle locks, and Configurations 5-9 on car door locks. 
     This invention has a structure of one or more inner keys added to a conventional door lock; staircase surfaces, screws, twisted gears, twisted shapes, bolted deadlock levers, and lock plates for preventing coercive rotation; and an inner key structure that allows reduction of equal key probabilities while the key size remains the same. As this invention holds three to fivefold safety functions, anyone other than the key holder cannot open this invented door lock even with equipments or universal keys. Non-electric powered deadlocks and levers make it difficult to coercively turn the door lock; even in case of coercive turning, only the twisted part is separated from the torque share section. High-intensity pins make it difficult even for a drill to destruct this door lock. The invention seems very useful for cylinder-type door locks, deadlocks, analog emergency keys of digital door locks, and car door locks. 
    
    
     
       BRIEF DESCRIPTION OF FIG.  
         FIG. 1  is a cross-section fig. of conventional door locks 
         FIG. 2  is a three-dimensional fig. of one disassembled example of the invention 
         FIG. 3  is a cross-section fig. of an assembled example of  FIG. 2   
         FIG. 4A  is another three-dimensional fig. of one disassembled example of the invention 
         FIG. 4B  is a partial cross-section fig. of  FIG. 4A   
         FIG. 4C  is an assembled plane fig. of  FIG. 4B   
         FIG. 4D  is a rotated cross-section fig. of  FIG. 4C   
         FIG. 5A  is a three-dimensional fig. of one disassembled example of the invention 
         FIG. 5B  is an assembled cross-section fig. of  FIG. 5A   
         FIG. 5C  is a cross-section fig. of an absorption axle 
         FIG. 6A  is another three-dimensional fig. of one disassembled example of the invention 
         FIG. 6B  is an assembled cross-section fig. of  FIG. 6A   
         FIG. 7A  is an illustrative fig. of inner keys inserted into keyholes of this invention 
         FIG. 7B  is a front view of another example of  FIG. 7A   
         FIG. 7C  is a front view of another example of  FIG. 7B   
         FIG. 7D  is an illustrative fig. of multiple inner keys inserted into keyholes of this invention 
         FIG. 7E  is an illustrative fig. of an inner key inserted into an extended keyhole of  FIG. 7D   
         FIG. 7F  is an illustrative fig. of inner keys inserted into the bottom of the plug 
         FIG. 7G  is an illustrative fig. of inner keys in another example of  FIG. 7F   
         FIG. 7H  is an illustrative fig. of inner keys in another example of  FIG. 7F   
         FIG. 7I  is an illustrative fig. of the hole for inner key (upper section) of  FIG. 7F   
         FIG. 7J  is a plane fig. of another example of  FIG. 7F   
         FIG. 7K  is a plane fig. of another example of  FIG. 7F   
         FIG. 7L  is a plane fig. of another example of  FIG. 7F   
         FIG. 7M  is a plane fig. of another example of  FIG. 7F   
         FIG. 7N  is a plane fig. of another example of  FIG. 7F   
         FIG. 7O  is a plane fig. of another example of  FIG. 7F   
         FIG. 7P  is a plane fig. of another example of  FIG. 7F   
         FIG. 8A  is an illustrative fig. of a deadlock inner key inserted into the keyhole of this invention 
         FIG. 8B  is a three-dimensional fig. of another example of  FIG. 8A   
         FIG. 8C  is a three-dimensional fig. of inner keys inserted into the bottom of the plug 
         FIG. 8D  is a plane fig. of numerous inner keys of deadlock 
         FIG. 8E  is a plane fig. of another example of  FIG. 8D   
         FIG. 8F  is a plane fig. of another example of  FIG. 8D   
         FIG. 9A  is a front view of a flat key of this invention 
         FIG. 9B  is a front view of another key type of this invention 
         FIG. 9C  is a side view of  FIG. 9B   
         FIG. 9D  is a front view of another key type of this invention 
         FIG. 9E  is a front view of the engraved key of this invention 
         FIG. 9F  is a front view of another key type of this invention 
         FIG. 9G  is a front view of another example of  FIG. 9E   
         FIG. 9H  is a front view of another example of  FIG. 9E   
         FIG. 9I  is a front view of embossed key of this invention 
         FIG. 9J  is a front view of engrave/embossed key of this invention 
         FIG. 10A  is a plane fig. of an example of lock plates which are used in this invention 
         FIG. 10B  is a plane fig. of another example of  FIG. 10A   
         FIG. 10C  is a plane fig. of another example of  FIG. 10A   
         FIG. 10D  is a front view of a plate pin 
         FIG. 10E  is a front view of another example of plate pins in  FIG. 10D   
         FIG. 10F  is a front view of another example of plate pins in  FIG. 10D   
         FIG. 10G  is a side view of another example of  FIG. 10A   
         FIG. 10H  is a side view of another example of  FIG. 10A   
         FIG. 11A  is an illustrative fig. of a lever which is used in this invention 
         FIG. 11B  is an illustrative fig. of another example of  FIG. 11A   
         FIG. 11C  is an illustrative fig. of another example of  FIG. 11A   
         FIG. 12A  is an illustrative fig. of an inner key inserted into a keyhole of this invention 
         FIG. 12B  is an illustrative fig. of an inner key inserted into the bottom of the plug of this invention 
         FIG. 13A  is a three-dimensional fig. of an embossed key of this invention 
         FIG. 13B  is a side cross-section fig. of another example of  FIG. 13A   
         FIG. 13C  is a three-dimensional fig. of another example of  FIG. 13A   
         FIG. 13D  is a front view of plate pins before being separated into upper and lower plate pins 
         FIG. 13E  is a plane fig. of separated plate pins and illustrative Fig. of holes 
         FIG. 13F  is an illustrative fig. of another example of  FIG. 13E   
         FIG. 14A  is a three-dimensional fig. of an engraved key of this invention 
         FIG. 14B  is a plane fig. of separated plate pins used for engraved keys 
         FIG. 15A  is a plane fig. of separated plate pins for engraved/embossed keys of this invention 
         FIG. 15B  is a plane fig. of another example of  FIG. 15A   
         FIG. 15C  is a plane fig. of another example of  FIG. 15A   
     
    
    
     DESCRIPTION OF NUMBERS IN FIG.  
       100 : key 
       103 ,  113 ,  123 ,  1103 : upper surfaces of waving curve or grooves 
       104 ,  1104 : geometrical protrusion or grooves 
       106 ,  116 ,  126 ,  1106 : flat surfaces 
       107 ,  108 ,  117 ,  118 ,  127 ,  128 ,  1107 : inclining surfaces 
       109 ,  119 ,  129 ,  139 : front surfaces (head) 
       130 : center plate of keys 
       210 ,  220 , etc: inner keys 
       211 ,  221 , etc: upper sections 
       212 ,  222 , etc: lower sections (lower protrusion) 
       214 ,  224 , etc: top surfaces 
       219 ,  229 , etc: upper surfaces of waving curve or grooves 
       3 : cylinder 
       33 : nut 
       38 : groove at inner cylinder 
       39 : interval of grooves 
       330 ,  340 : upper and lower horizontal groove or holes 
       333 : engraved groove 
       4 : plug 
       40 : hole for upper section of inner key 
       42 : keyhole 
       45 : protruded shapes 
       47 ,  32 : upper and lower pin holes 
       49 ,  411 : plate pin holes 
       410 : lock plate insertion hole 
       417 ,  427 , etc: spring insertion holes 
       418 ,  428 , etc: pin holes 
       422 : extended keyhole 
       440 : staircase surface or inclining surface 
       441 : twisted gear or twisted shapes 
       442 : screw bolt 
       499 : small spring hole 
       7 ,  77 ,  707 ,  717 ,  737 ,  787 : springs 
       700 : lock plate 
       735 : protrusion at bottom side 
       740 : center hole of lock plate 
       775 : inner key insertion plate or spring stopper plate 
       8 A,  8 D,  8 E: plate pins 
       8 B,  8 C: separated plate pins 
       84 : plate keyhole 
       85 : protrusion 
       86 ,  87 : upper and lower protrusions 
       800 : lever 
       92 ,  91 : upper and lower pins 
     IMPLEMENTATION OF INVENTION  
     A detailed description of this invention, with aid of fig., is as follows: 
       FIG. 1  is a cross-section fig. of conventional door locks. A plug ( 4 ) is installed within a cylinder ( 3 ) in a manner that inner rotation is possible; in the center of the plug, there is a horizontal keyhole ( 42 ), and there are upper and lower pins ( 92 ,  91 ). Numerous pins ( 92 ,  91 ) pass through the cylinder ( 3 ) and plug ( 4 ). When the key ( 100 ) is inserted, the waving curve ( 103 ) of the key aligns the borderlines of abovementioned upper and lower pins to the borderlines of the cylinder and plug for rotation and unlocking. 
       FIG. 2  is a three-dimensional fig. of one disassembled example of the invention.  FIG. 3  is a cross-section fig. of an assembled example of  FIG. 2 , consisting of a cylinder ( 3 ), plug ( 4 ) and a stopper/hitch ( 6 ) tightened by the axle ( 46 ). This door lock structure rotates to the right and left for unlocking when the key ( 100 ) is inserted into the plug keyhole ( 42 ), thus aligning numerous plate pins ( 8 A) of plate pin holes ( 49 ) to the horizontal grooves or holes ( 330 ,  340 ) of the cylinder. Additionally in the plug, there is a gear or twisted protrusion ( 45 ) with an axle ( 46 ) in one piece. The cylinder has an engraved groove ( 333 ) which is to be interlocked to the twisted protrusion; here the twisted gear or twisted shape ( 441 ) is interlocked to the engraved groove. A spring ( 7 ) can be added to the axle ( 46 ) so as to push or pull the plug. There is also a stopper/hitch ( 6 ) which is fixed at a location where the twisted protrusion is pulled but of the engraved groove. When the key is inserted to this structure, many plate pins ( 8 A) are aligned, rotating and pulling the key to unravel the gear from the engraved groove for locking and unlocking through left or right rotation. When coercive rotation is attempted, the plug is separated at the torque share section ( 490 ) in between the gear and lower section of the plug; the gear, which is pulled by a spring, does not pull out. Also, when a high-intensity pin is innate in this structure, destruction is difficult even with a drill. This configuration is most adequate for car door locks. 
       FIG. 4A  is another three-dimensional fig. of one disassembled example of the invention.  FIG. 4B  is a partial cross-section fig. of  FIG. 4A ;  FIG. 4C  is an assembled plane fig. of  FIG. 4B ,  FIG. 4D  is a rotated cross-section fig. of  FIG. 4C .  FIG. 4D  is same as Configuration 2, but plate pins ( FIG. 10A ,  10 G) are not indicated. 
       FIG. 5A  is a three-dimensional fig. of one disassembled example of the invention. The protruded shape ( 45 ) is a screw bolt and there is a nut ( 33 ) to which the screw bolt ( 442 ) is interlocked.  FIG. 5B  is an assembled cross-section fig. of  FIG. 5A . When the bolt is at the center of the nut, locking or unlocking occurs when the protrusion of plug is adjacent to the bottom of the cylinder. When the key is rotated, locking or unlocking is possible; when the key is pulled vertically, the key pulls out and the plug cannot be turned.  FIG. 5C  is a cross-section fig. of an absorption axle; the axle ( 46 ) is to be locked when the plug moves vertically ( FIG. 3 ,  4 ,  5 ) and a flange ( 51 ) and absorption axle ( 50 ) with an angled hole ( 52 ) is inserted into the bottom of the plug. This is locked along with the axle ( 8 ) by the stopper/hitch ( 6 ); when the angled axel ( 46 ) is inserted and installed to the angled hole ( 52 ), the axle can only be rotated to right and left. Such structures shown in  FIGS. 4 and 5  are adequate for deadlocks and digital door locks. 
       FIG. 6A  is another three-dimensional fig. of one disassembled example of the invention. The plug ( 4 ) has a lock plate ( 700 ,  710 ,  720 ,  740 ;  FIG. 10A ) runs through the side hole ( 410 ) of the plug to pass all the way through to the upper pin hole ( 47 ). In this cylinder ( 3 ) and plug ( 4 ) which has a stopper/groove ( 414 ) at the upper section ( 41 ), there is a hole ( 314 ) which corresponds to the stopper/groove ( 414 ), upper hole ( 310 ) and a protrusion ( 316 ) at the lower side of the cylinder. There also is a lever ( 800 ) which has an upper section ( 810 ), center section ( 830 ) and a lower section ( 820 ) with pin holes ( 850 ); a pin ( 10 ) with an upper section ( 11 ), a lower section ( 12 ) and a stopper ring ( 13 ); and a spring ( 787 ).  FIG. 6B  is an assembled cross-section fig. of  FIG. 6A ; plate pins ( 700 ) pass through the hole ( 410 ) in the plug ( 4 ), and the upper section ( 710 ) is inserted into the upper pin hole ( 47 ) of the plug. The upper section ( 810 ) of the lever runs through the cylinder hole ( 314 ), inserted into the stopper/groove ( 414 ) and the lower section ( 12 ) of the pin is inserted into the upper hole ( 310 ). This structure itself is inserted into the plug and while the center section ( 830 ) of the lever is being pressed, the upper section ( 11 ) is installed to the pin hole ( 850 ) at the lower section of the lever, along with a spring ( 787 ). When the key is inserted the incline ( 108 ) and the front surface ( 109 ) of the key are inserted into the center hole ( 740 ) of the lock plate, thus pushing the lock plate upwards so that the lower section of the ( 720 ) lock plate is pulled out of the cylinder lower hole ( 320 ). This makes the lower section of the lock plate aligned to the outer border surface of the plug and pulls the upper section ( 810 ) of the lever out of the stopper/groove ( 414 ), allowing the key to turn and unlock the structure. 
       FIG. 7A  is an illustrative fig. of inner keys inserted into keyholes of this invention.  FIG. 7B  is a front view of another example of  FIG. 7A .  FIG. 7C  is a front view of another example of  FIG. 7B , and  FIG. 7D  is an illustrative fig. of multiple inner keys inserted into keyholes of this invention.  FIG. 7E  is an illustrative fig. of an inner key inserted into an extended keyhole of  FIG. 7D .  FIG. 7F  is an illustrative fig. of inner keys inserted into the bottom of the plug.  FIG. 7G  is an illustrative fig. of inner keys in another example of  FIG. 7F ;  FIG. 7H  is an illustrative fig. of inner keys in another example of  FIG. 7F .  FIG. 7I  is an illustrative fig. of the hole for inner key (upper section) of  FIG. 7F  and  FIG. 7J  is a plane fig. of another example of  FIG. 7F . This is identical to descriptions of Configuration 7.  FIG. 7K  is a plane fig. of another example of  FIG. 7F ;  FIG. 7L  is a plane fig. of another example of  FIG. 7F ;  FIG. 7M  is a plane fig. of another example of  FIG. 7F ;  FIG. 7N  is a plane fig. of another example of  FIG. 7F ;  FIG. 70  is a plane fig. of another example of  FIG. 7F ;  FIG. 7P  is a plane fig. of another example of  FIG. 7F . As shown in  FIG. 7I , plate pin key holes ( FIG. 10D ,  10 E,  10 F) and separated plate pins ( FIG. 13E ) is best to be within range of the central key hole, so that they will correspond to the geometrical shapes of front surfaces ( 109 ,  119 ,  129 ,  139 ) and inclines ( 107 ,  108 ,  117 ,  118 ,  127 ,  128 ) of a car key ( FIG. 9 ). 
       FIG. 8A  is an illustrative fig. of a deadlock inner key inserted into the keyhole of this invention.  FIG. 8B  is a three-dimensional fig. of another example of  FIG. 8A ; this is a deadlock inner key which has one inner key inserted into the keyhole ( FIG. 12A ).  FIG. 8C  is a three-dimensional fig. of inner keys inserted into the bottom of the plug; this structure has a upper section insertion hole for upper section of inner key ( 40 ) and the lower section of the inner key is a protrusion ( 212 ,  222 , etc) which is larger than the upper section ( 211 ,  221 , etc), thus allowing enough space for the spring ( 707 ). This is advantageous because protrusions ( 2 ) can be selectively adjusted on the protrusion holes ( 200 ) at the top. This structure best fits deadlock structures.  FIG. 8D  is a plane fig. of numerous inner keys of deadlock;  FIG. 8E  is a plane fig. of another example of  FIG. 8D ;  FIG. 8F  is a plane fig. of another example of  FIG. 8D . The inner key of  FIGS. 7F and 7H  are located to correspond to the position of inclines ( 108 ) and grooves ( 104 ) of the key ( FIG. 9B ,  9 C). 
       FIG. 9A  is a front view of a flat key of this invention; a flat surface ( 106 ) is formed on the incline so that the lock plates of  FIG. 10A  or plate pins of  FIG. 10D  become aligned to the central plate keyhole ( 84 ). This is identical to descriptions of Configurations 1 and 5.  FIG. 9B  is a front view of another key type of this invention, and  FIG. 9C  is a side view of  FIG. 9B . Description of this Fig. is same as  FIGS. 8D ,  8 E and  8 F.  FIG. 9D  is a front view of another key type of this invention; one or more geometrical protrusion or groove is formed on the upper section of a flat key to press the top side of the inner key shown in  FIGS. 12A and 12B .  FIG. 9E  is a front view of the engraved key of this invention, and this is an engraved key which has geometrical protrusions or grooves ( 1104 ) in the front surface ( 139 ).  FIG. 9F  is a front view of another key type of this invention, and the descriptions are same as that of  FIG. 9A .  FIG. 9G  is a front view of another example of  FIG. 9E ; a flat surface ( 116 ) is formed on the incline ( 117 ), using lock plates of  FIG. 10C  as plate pins (not grooves of flat surfaces). This key type is utilized as an engraved key in Configuration 5.  FIG. 9H  is a front view of another example of  FIG. 9E ; an engraved key and plate pins of  FIG. 10E  are used together. Unlike  FIG. 10G , this structure can reduce probability of equal keys since one or more waving curves or grooves ( 1103 ) and one or more plate pins ( 8 A) at the center plate ( 130 ).  FIG. 9I  is a front view of embossed key of invention. Geometrical grooves ( 1104 ) can be made at the front surface ( 139 ) of waving curves and waving curve or grooves ( 113 ,  123 ) at the incline ( 118 ,  128 ). This key also has plate pins and can be utilized for Configuration 5.  FIG. 9J  is a front view of engrave/embossed key of this invention; this is a combination of  FIGS. 9G and 9I . 
       FIG. 10A  is a plane fig. of an example of lock plates which are used in this invention. A hitch ( 780 ,  790 ) is formed on the upper section ( 710 ), lower section ( 720 ), center hole ( 740 ) and each side of the upper section. The length of the upper section and the lower section are either as long as or shorter than the plug. Movement is possible in the center hole ( 740 ) due to the incline ( 216 ) of the inner key. The upper section can be made shorter than the lower section ( 720 ); the length can be as short as a pin ( 10 ) so that it can be interlocked to the plug.  FIG. 10B  is a plane fig. of another example of  FIG. 10A ; the center hole is circular so that the upper section of the key and bullet-shaped inclines can be inserted.  FIG. 10C  is a plane fig. of another example of  FIG. 10A ; protrusions ( 745 ) are pushed or pulled by the incline ( 107 ) of the key to move the lock plates front or backwards.  FIG. 10D  is a front view of a plate pin;  FIG. 10E  is a front view of another example of plate pins in  FIG. 10D ;  FIG. 10F  is a front view of another example of plate pins in  FIG. 10D ; flat keys, engraved keys and embossed keys are utilized ( FIG. 9A ,  9 F,  9 H,  9 I).  FIG. 10G  is a side view of another example of  FIG. 10A ;  FIG. 10H  is a side view of another example of  FIG. 10A ; the protrusion at bottom side ( 735 ) is identical to that in Configuration 2 and the axle ( 730 ) is pressed by the spring ( 717 ) to interlock the lower section ( 720 ) to the groove ( 320 ) of the cylinder. When this is formed at the lower part of the upper section, the upper section ( 710 ) is inserted into the cylinder hole. 
       FIG. 11A  is an illustrative fig. of a lever which is used in this invention; in the lever ( 800 ), which consists of an upper section ( 810 ), lower section ( 820 ), center section ( 830 ), the upper section has a   shape and there are pin holes ( 850 ) at the lower section.  FIG. 11B  is an illustrative fig. of another example of  FIG. 11A , and  FIG. 11C  is an illustrative fig. of another example of  FIG. 11A . Descriptions are same as those in Configuration 8. 
       FIG. 12A  is an illustrative fig. of an inner key inserted into a keyhole of this invention. Although there is only one inner key ( 210 ;  FIG. 7A ), there can be more than one as described in Configuration 7 ( FIG. 7D ). IN the case of car door locks, an extended keyhole ( 422 ) is made, just as described in  FIG. 7I ,  7 K,  7 L,  7 M,  7 N,  7 O,  7 P. In case of deadlocks,  FIGS. 8A and 8B  are used for one inner key and the inner key of  7 D can be installed into  FIGS. 8D and 8E  when there are more than one inner key.  FIG. 12B  is an illustrative fig. of an inner key inserted into the bottom of the plug of this invention; for car door locks, inner keys of  FIGS. 7F and 7G  are installed to the bottom of the plug (separated from the keyhole) as shown in  FIGS. 7K ,  7 L,  7 M,  7 N,  7 O, and  7 P. For deadlocks, inner keys ( FIGS. 7F and 7H ) are installed as shown in  FIGS. 8D ,  8 E and  8 F. 
       FIG. 13A  is a three-dimensional fig. of an embossed key of this invention, and  FIG. 13B  is a side cross-section fig. of another example of  FIG. 13A . The key ( 100 ) has a front surface ( 119 ,  129 ), incline ( 118 ,  128 ), waving curve or groove ( 113 ,  123 ) and an embossed key at the upper section.  FIG. 13C  is a three-dimensional fig. of another example of  FIG. 13A ; this is an embossed key without the center plate ( 130 ) of the key. Descriptions of this key are same as those of  13 A and  13 B.  FIG. 13D  is a front view of plate pins before being separated into upper and lower plate pins. A plate pin ( 8 D) has stoppers ( 82 ) and another plate pin ( 8 E) has a stopper ( 83 ) at a symmetrical position from the first plate pin ( 8 D).  FIG. 13E  is a plane fig. of separated plate pins and illustrative Fig. of holes; it shows separated (upper and lower) plate pins ( 8 B,  8 C) which have stoppers  81  and  82 / 83 , respectively. However, plate pins should be separated to upper and lower holes ( 49 ) and the spring holes ( 499 ) should be symmetrical. This pair is to be called separated plate pins ( 8 B,  8 C) and another set of separated plate pins ( 8 C,  8 B) can be inserted from the top, bottom or each side.  FIG. 13F  is an illustrative fig. of another example of  FIG. 13E ; it is different from  FIG. 13E  only in that the separated plate pins ( 8 B,  8 C) can be inserted from any side and in two pairs. 
       FIG. 14A  is a three-dimensional fig. of an engraved key of this invention. The key ( 100 ) has an engraved waving curve or groove ( 113 ,  123 ) at the center plate. At each top and bottom side of the front surface ( 139 ), inclines ( 117 ,  127 ) are to be carved towards the central groove. This invention can have one or more geometrical protrusions ( 1104 ) at the front surface ( 139 ) and also can be engraved in a symmetrical method at the inclines ( 1107 ) to form an ‘M’ shape ( FIG. 9H ). Also, the engraved key can have geometrical protrusions ( 1104 ) like shown in  FIG. 9G .  FIG. 14B  is a plane fig. of separated plate pins used for engraved keys. Separate pin holes at the plug are same as those of  FIG. 13E . 
       FIG. 15A  is a plane fig. of separated plate pins for engraved/embossed keys of this invention. The engraved/embossed key is as describe in  FIG. 9J , and  FIG. 15A  shows separated plate pins used for this key type.  FIG. 15B  is a plane fig. of another example of  FIG. 15A ;  FIG. 15C  is a plane fig, of another example of  FIG. 15A . Separated plate pins of  FIG. 15B  are engraved separated plate pins that have vertical carved surfaces ( 28 ) which are aligned to the protrusion ( 85 ) at the center of the keyhole. Plate pins  8 C are embossed separated plate pins that have a vertical carved surface ( 28 ) adjacent to the other plate pins  8 B. The vertical carved surface ( 28 ) of plate pins  8 B is inserted adjacently to the existing separated plate pins  8 C which is pressed and held at the spring stopper ( 81 ) due to a spring ( 9 ). Here, an interval can be made between the carved surfaces of each separated plate pins so that this interval can be interlocked to each groove in the cylinder. When the engraved/embossed key is inserted into the plate keyhole ( 84 ) of these separated plate pins ( 8 B,  8 C) the engraved section and protrusions of the embossed section presses the stopper ( 83 ), depending on the height of protrusions so that each protrusion ( 86 ) are pulled out of the cylinder groove or hole ( 330 ), thus making an alignment with the outer border surface of the plug and enabling unlock. Also, such separated plate pins can be made into two pairs ( 8 B,  8 C,  8 C,  8 B).  FIG. 15C  refers to a state where embossed separated plate pins ( 8 C) are inserted from upper and lower sides. The separated plate pins can be inserted in separate and independent holes or even in symmetrically opposite positions. 
     INDUSTRIAL APPLICABILITY  
     Door locks are being utilized in various industrial areas. Such door locks, of course, should not be opened or damaged easily by anyone. 
     This invention has a device for preventing coercive rotation and its structure allows minimization of equal key probabilities. This invention is for utilization in simple structures such as cylinder-type door handle locks, lever-type door handle locks, analog keys of digital door locks, and also for utilization on emergency analog keys for car door locks with no-key structures; analog keys are essential as emergency keys for digital door locks as they show fragility on static electricity, magnetic fields, surges, and heat in case of fire.