JPH0723492Y2 - Cylinder lock - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to a method of unlocking using a key in which a groove is provided on the side surface of a key and a key mountain is formed in the groove. Regarding cylinder lock.

(Prior Art) Conventionally, a key of a cylinder lock is generally one in which a key mountain is formed on a side edge portion of a key blank, but as shown in FIG. A cylinder lock using a key 1 called a so-called Uchiyama key is provided. This key 1 has grooves 2 formed on both side surfaces along the insertion direction of the key, and key ridges 3 are formed on the inner edges of the grooves 2 facing each other.
Are formed. On the other hand, as shown in FIG. 7, the lock plate 4 used for this type of cylinder lock has an engaging projection 6 that fits into the groove 2 in the central portion of the key insertion hole 5.

(Problems to be Solved by the Invention) A key 1 used in a cylinder lock of this type has a groove portion 2 widened at a tip portion thereof, and a tip of a ridge 7 located on both sides of the groove portion 2 has a pointed shape. Has been done. On the other hand, in the conventional cylinder lock of this type, as shown in FIG. 7, a predetermined gap d is formed between the key insertion hole 9 of the key rotor 8 and the engaging convex portion 6 of the lock plate 4, and the key 1 is locked. Key insertion hole 9
When it is inserted in, the tip of the ridge 7 is inserted into the gap so that the engaging protrusion 6 of the lock plate 4 is engaged with the groove 2. However, it is illegal to insert a tool called a picking tool into the gap between the key insertion hole 9 of the key rotor 8 and the engaging projection 6 of the lock plate 4 to unlock without using a so-called regular key. There was a possibility that actions would be taken.

Therefore, an object of the present invention is to provide a cylinder lock that makes unauthorized unlocking difficult.

[Means for Solving the Problems] The present invention is directed to a cylinder body having an inner peripheral surface provided with a rotor insertion hole having a locking engaging groove, and a key insertion member rotatably provided in the rotor insertion hole of the cylinder body. A key rotor having an insertion hole, a lock plate insertion hole having both ends orthogonal to the key insertion hole of the key rotor and penetrating the outer periphery of the key rotor, and a key that is slidably disposed in the lock plate insertion hole. In a state in which the lock plate is not locked, a lock member is urged to move in a predetermined direction by a spring member so that an engaging portion at an end engages with the lock engaging groove to prevent rotation of the key rotor; A key insertion hole which is formed in a substantially central portion so as to communicate with the key insertion hole of the key rotor and through which the key penetrates, and an end on the predetermined direction side which is provided at a substantially central position of an inner peripheral surface of the key insertion hole. Before An engaging protrusion that engages with a key crest provided in a groove on the side surface of the key, the end of the engaging protrusion on the predetermined direction side and the key inserting hole in the predetermined direction. Side end is formed so as to substantially match or wrap when viewed from the key insertion direction in the movement limit position state of the lock plate in the predetermined direction, and the end of the key insertion hole opposite to the predetermined direction is formed. In the state where the lock plate is in the movement limit position in the predetermined direction, the lock plate is formed so as to be located on the predetermined direction side with respect to the end of the key insertion hole opposite to the predetermined direction. When the key is inserted, the side edge portion of the key comes into contact with the end of the key insertion hole opposite to the predetermined direction to move the lock plate against the spring member in the direction opposite to the predetermined direction. Of the engaging protrusion It is characterized in that the moving end of the serial predetermined direction to a position engageable with the key mountain of the key.

(Operation) According to the above-mentioned means, the part of the engagement protrusion provided on the lock plate with which the key crest provided on the key engages is the key insertion hole when the key is not inserted. Since there is no gap between the inner surface and the inner surface, it is difficult to use a tool for illegally unlocking, and it is difficult to illegally unlock.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. A rotor insertion hole 12 is provided on the inner surface of the cylindrical cylinder body 11, and the row insertion hole 12 has a locking engagement groove in a positional relationship of facing each other across the center line.
13 and an escape groove 12a are provided. A key rotor 14 rotatably provided in the rotor insertion hole 12 is provided with a key insertion hole 15 having a rectangular cross section and extending along the center of the key rotor 14, and a central portion thereof for guiding. The ridges 15a, 15a are provided. The key rotor 14 is provided with several slit-shaped lock plate insertion holes 16 having a rectangular cross section which intersects the key insertion hole 15 at a right angle and is in a communication state, and an engaging portion 17 is formed at one end thereof. Provided with a lock plate 18, and a spring for biasing the lock plate 18 in a predetermined direction of arrow A between a spring-hanging convex portion 18a provided on the lock plate 18 and a step portion 14a provided on the key rotor 14. A coil spring 19 as a member is provided. A key insertion hole 20 communicating with the key insertion hole 15 of the key rotor 14 is provided at a substantially central portion of the lock plate 18, and a key ridge described later is engaged at a substantially central position of an inner peripheral surface of the key insertion hole 20. The engaging convex portion 21 is provided.

In the state in which no key is inserted into the key insertion hole 15 of the key rotor 14 (the state where the lock plate 18 is at the movement limit position in the direction of arrow A) in FIG. 1, the engaging portion 17 is a coil spring.
The lock engagement groove 13 is engaged by the urging force of the lock engagement groove 19. In this state, the upper end 21a of the engagement protrusion 21 on the arrow A direction side in FIG. 1 has a key insertion hole. One end 20a, which is the end on the opposite side to the arrow A direction side in FIG. 1 of the key insertion hole 20, is aligned with the upper end which is the end on the arrow A direction side in 15 without a gap when viewed from the key insertion direction. The hole 15 is located above the lower end 15b, which is the end opposite to the arrow A direction side, by a predetermined dimension e (arrow A direction side). In addition,
The upper end 21a, which is the end on the arrow A direction side, may be wrapped around the upper end, which is the end on the arrow A direction side in the key insertion hole 15, as viewed from the key insertion direction.

On the other hand, as shown in FIG. 2, the key 22 has a groove portion 23 formed along the longitudinal direction at the center of both side surfaces thereof.
Ridges 24 from both sides to form ridges 24
The key ridges 25 are provided on the portions of the key 24 that face each other.
The a is formed in an arc shape, and the tips 24a of the ridges 24 are inclined toward the outside of the groove 23 toward the both side edges of the key 22 and have a pointed tip.

Next, the operation of the above configuration will be described. When the key 22 is inserted into the key insertion hole 15 of the key rotor 14, the lower corner portion 22a of the key 22 in FIG. 2 is first inserted into the lower one end 20a of the key insertion hole 20 of the lock plate 18. The lock plate 20 is brought into contact with the coil spring 19 to move it e dimensionally in the direction opposite to arrow A against the coil spring 19, and the lock plate 20 is displaced between the upper end 21a of the engaging projection 21 and the upper end of the key insertion hole 15 as shown in FIG. As shown in the figure, when a gap of dimension e is formed and the key 22 is pushed further,
The leading end 24a of 24 enters into the gap, the key ridge 25 engages with the upper end 21a of the engaging projection 21 of the lock plate 18, and the lock plate 18 resists the coil spring 19 and further arrow A Direction, the engaging portion 17 of the lock plate 18 is brought into a state shown in FIG. 4 which is flush with the outer circumference of the key rotor 14,
When the key 22 is rotated, the key rotor 14 can be rotated.

In the above configuration, the upper end 21 of the engaging protrusion 21 of the lock plate 18 is in a state where the key 22 is not inserted into the key insertion hole 15.
Since there is no gap between a and the key insertion hole 15,
It is difficult to insert a picking tool directly between them, and another tool is hung on one end 20a of the key insertion hole 20 to lock the lock plate 18 against the coil spring 19 and to form an anti-arrow A.
The locking projection 18 of the lock plate 18
Since it is necessary to make a gap between the upper end 21a of the key and the key insertion hole 15, in order to unlock without using the key, 2
It is necessary to operate the individual tools, and thus the fraud of unlocking without using the key is prevented as much as possible.

FIG. 6 shows a second embodiment of the present invention, and only parts different from the first embodiment will be described. That is, a slit-shaped ridge 26 extending in the insertion direction of the key 22 is formed in the central portion of the inner periphery of the upper and lower ends of the key insertion hole 15, and when the tool for picking has a wide width, it is inserted. Since it has the effect of preventing the lock, the shape of the tool used for picking is limited, and there is an effect that fraudulent unlocking without using a key is further prevented.

[Advantages of the Invention] As is apparent from the above description, the present invention is a cylinder body having a rotor insertion hole having an engaging groove for locking on its inner peripheral surface, and is rotatable in the rotor insertion hole of the cylinder body. A key rotor provided with a key insertion hole, a lock plate insertion hole having both ends orthogonal to the key insertion hole of the key rotor and penetrating the outer circumference of the key rotor, and a lock plate insertion hole slidably arranged in the lock plate insertion hole. A lock plate that is urged to move in a predetermined direction by a spring member when the key is not inserted and the end engaging portion engages with the lock engaging groove to prevent rotation of the key rotor; A key insertion hole which is formed in a substantially central portion of the lock plate so as to communicate with a key insertion hole of the key rotor, and through which the key penetrates; and a key insertion hole which is provided at a substantially central position of an inner peripheral surface of the key insertion hole. Place The end on the constant direction side has an engaging convex portion that engages with the key crest provided in the groove on the side surface of the key, and the end of the engaging convex portion on the predetermined direction side and the key difference The end of the insertion hole on the predetermined direction side is formed so as to substantially match or wrap when viewed from the key insertion direction when the lock plate is in the movement limit position state in the predetermined direction. And an end on the opposite side in the movement limit position state of the lock plate in the predetermined direction,
The key insertion hole is formed so as to be located on the predetermined direction side with respect to the end opposite to the predetermined direction, and when the key is inserted into the key insertion hole, the side edge portion of the key is inserted into the key. The lock plate is brought into contact with an end of the hole on the side opposite to the predetermined direction to move the lock plate in the direction opposite to the predetermined direction against the spring member, and the end of the engagement projection on the side of the predetermined direction is moved to the key. Since it is characterized in that it is moved to a position where it can be engaged with the key ridge, it is difficult to use a tool for illicit unlocking, and there is an excellent effect that illicit unlocking is difficult. .

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view, FIG. 2 is a perspective view of a key, FIG. 3 is a perspective view of a lock plate, and FIG. FIG. 5 is a vertical cross-sectional view in a state of operation different from FIG. 1, FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4, and FIG. 6 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. FIGS. 7 and 8 show a conventional structure, FIG. 7 is a view corresponding to FIG. 1, and FIG. 8 is a view corresponding to FIG. In the drawings, 11 is a cylinder body, 12 is a rotor insertion hole, 13 is a locking engagement groove, 14 is a key rotor, 15 is a key insertion hole, 17 is an engaging portion, 18 is a lock plate, 19 is a coil spring (spring). Member), 20 is a key insertion hole, 21 is an engaging convex portion, 22 is a key, 23 is a groove portion, and 25 is a key crest.

Claims (1)

[Scope of utility model registration request] 1. A cylinder body having an inner peripheral surface provided with a rotor insertion hole having a locking engagement groove, and a key rotor having a key insertion hole rotatably provided in the rotor insertion hole of the cylinder body. A lock plate insertion hole having both ends orthogonal to the key insertion hole of the key rotor and penetrating the outer periphery of the key rotor, and a spring member slidably disposed in the lock plate insertion hole and having no key inserted thereinto. A lock plate that is urged to move in a predetermined direction by its end to engage with the lock engaging groove to prevent rotation of the key rotor; and the key rotor at a substantially central portion of the lock plate. A key insertion hole that is formed so as to communicate with the key insertion hole and through which the key penetrates, and an end on the predetermined direction side that is provided at a substantially central position on the inner peripheral surface of the key insertion hole is a groove portion on the side surface of the key. Placed in An engaging convex portion that engages with the key ridge, the end of the engaging convex portion on the predetermined direction side and the end of the key inserting hole on the predetermined direction side, the lock plate. In the movement limit position state of the above in the predetermined direction,
The key insertion hole is formed so as to substantially match or wrap when viewed from the key insertion direction. Is formed so as to be located on the predetermined direction side with respect to the end opposite to the predetermined direction in the key insertion hole, and when the key is inserted into the key insertion hole, the side edge portion of the key is in the predetermined direction in the key insertion hole. Abutting the end on the opposite side to move the lock plate in the direction opposite to the predetermined direction against the spring member, and engage the end on the predetermined direction side of the engaging projection with the key crest of the key. A cylinder lock characterized by being moved to a position where it can be fitted.